diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e9f618773..f4cf5716e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -17,7 +17,7 @@ test:
 
   script:
     - ./gradlew --no-daemon -Djava.security.egd=file:/dev/urandom animalSnifferMain animalSnifferTest
-    - ./gradlew --no-daemon -Djava.security.egd=file:/dev/urandom test
+    - ./gradlew --no-daemon -Djava.security.egd=file:/dev/urandom check compileOfficialDebugAndroidTestSources compileScreenshotDebugAndroidTestSources
 
   after_script:
     # these file change every time but should not be cached
diff --git a/.idea/codeStyles/Project.xml b/.idea/codeStyles/Project.xml
index 011a1a146..78dfd234a 100644
--- a/.idea/codeStyles/Project.xml
+++ b/.idea/codeStyles/Project.xml
@@ -1,5 +1,8 @@
 <component name="ProjectCodeStyleConfiguration">
   <code_scheme name="Project" version="173">
+    <AndroidXmlCodeStyleSettings>
+      <option name="ARRANGEMENT_SETTINGS_MIGRATED_TO_191" value="true" />
+    </AndroidXmlCodeStyleSettings>
     <JavaCodeStyleSettings>
       <option name="ANNOTATION_PARAMETER_WRAP" value="1" />
       <option name="IMPORT_LAYOUT_TABLE">
diff --git a/bramble-android/build.gradle b/bramble-android/build.gradle
index 40ab2c1f1..7341ea6fa 100644
--- a/bramble-android/build.gradle
+++ b/bramble-android/build.gradle
@@ -5,8 +5,8 @@ apply plugin: 'witness'
 apply from: 'witness.gradle'
 
 android {
-	compileSdkVersion 28
-	buildToolsVersion '28.0.3'
+	compileSdkVersion 29
+	buildToolsVersion '29.0.2'
 
 	defaultConfig {
 		minSdkVersion 16
@@ -15,13 +15,21 @@ android {
 		versionName "1.2.4"
 		consumerProguardFiles 'proguard-rules.txt'
 
-		testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+		testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
 	}
 
 	compileOptions {
 		sourceCompatibility JavaVersion.VERSION_1_8
 		targetCompatibility JavaVersion.VERSION_1_8
 	}
+
+	lintOptions {
+		// FIXME
+		warning "LintError"
+		warning "InvalidPackage"
+		warning "MissingPermission"
+		warning "InlinedApi", "ObsoleteSdkInt", "Override", "NewApi", "UnusedAttribute"
+	}
 }
 
 configurations {
@@ -33,7 +41,7 @@ dependencies {
 	tor 'org.briarproject:tor-android:0.3.5.8-64@zip'
 	tor 'org.briarproject:obfs4proxy-android:0.0.11-2@zip'
 
-	annotationProcessor 'com.google.dagger:dagger-compiler:2.22.1'
+	annotationProcessor 'com.google.dagger:dagger-compiler:2.24'
 
 	compileOnly 'javax.annotation:jsr250-api:1.0'
 
diff --git a/bramble-android/witness.gradle b/bramble-android/witness.gradle
index 352cd66fc..cb4de0b14 100644
--- a/bramble-android/witness.gradle
+++ b/bramble-android/witness.gradle
@@ -1,44 +1,46 @@
 dependencyVerification {
     verify = [
         'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
-        'com.android.tools.analytics-library:protos:26.4.0:protos-26.4.0.jar:ad760915586797d39319f402837b378bff3bb4ed583e3e0c48c965631fb2135f',
-        'com.android.tools.analytics-library:shared:26.4.0:shared-26.4.0.jar:1332106a905d48909c81268c9e414946de3e83487db394c6073b0a9b5c3d0ed2',
-        'com.android.tools.analytics-library:tracker:26.4.0:tracker-26.4.0.jar:d0020cfbfd4cd75935f2972d6a24089840d4a10df6f3ef2a796093217dd37796',
-        'com.android.tools.build:apksig:3.4.0:apksig-3.4.0.jar:91d5a1866139c69756280355a6f61b4d619d0516841580114f45a10f2177327e',
-        'com.android.tools.build:apkzlib:3.4.0:apkzlib-3.4.0.jar:8653c85f5fdf1dde840e8b8af7396aeb79c34b66e541b5860059616006535592',
-        'com.android.tools.build:builder-model:3.4.0:builder-model-3.4.0.jar:a88f138124a9f016a70bcb4760359a502f65c7deed56507ee4014f4dd9ea853b',
-        'com.android.tools.build:builder-test-api:3.4.0:builder-test-api-3.4.0.jar:31089ab1ec19ca7687a010867d2f3807513c805b8226979706f4247b5d4df26f',
-        'com.android.tools.build:builder:3.4.0:builder-3.4.0.jar:476221b5203a7f50089bf185ed95000a34b6f5020ef0a17815afd58606922679',
-        'com.android.tools.build:gradle-api:3.4.0:gradle-api-3.4.0.jar:215eca38f6719213c2f492b4d622cdd11676c66c9871f8a2aed0c66d00175628',
-        'com.android.tools.build:manifest-merger:26.4.0:manifest-merger-26.4.0.jar:29e45e690dedd165035e97c21c2ca94d0bd4ec16b6b210daa26669a582b6f220',
-        'com.android.tools.ddms:ddmlib:26.4.0:ddmlib-26.4.0.jar:93f56fe4630c3166adbd6c51d7bb602d96abb91b07ba5b1165fdcd071e88c940',
-        'com.android.tools.external.com-intellij:intellij-core:26.4.0:intellij-core-26.4.0.jar:30cb0e879d4424de9677a50b537fb628636b4a50f5470af5e52437980c41421f',
-        'com.android.tools.external.com-intellij:kotlin-compiler:26.4.0:kotlin-compiler-26.4.0.jar:dd1fe225c31a0e012dc025336363a5b783e2c5c20ffb69e77f8f57e89420d998',
-        'com.android.tools.external.org-jetbrains:uast:26.4.0:uast-26.4.0.jar:f25f3285b775a983327583ff6584dea54e447813ef69e0ce08b05a45b5f4aab0',
-        'com.android.tools.layoutlib:layoutlib-api:26.4.0:layoutlib-api-26.4.0.jar:52128f5cf293b224072be361919bfd416e59480ab7264ddcdbbf046b0d7a12e3',
-        'com.android.tools.lint:lint-api:26.4.0:lint-api-26.4.0.jar:fdb8fca8ae4c254f438338d03d72605e00ed106f2d5550405af41ca1c8509401',
-        'com.android.tools.lint:lint-checks:26.4.0:lint-checks-26.4.0.jar:4ff52d40488cd3e22b9c6b2eb67784e0c3269d0b42ef9d17689cd75a7b2bceb4',
-        'com.android.tools.lint:lint-gradle-api:26.4.0:lint-gradle-api-26.4.0.jar:714b7a85c7d2aa10daeab16e969fe7530c659d0728a7f24021da456870418d0f',
-        'com.android.tools.lint:lint-gradle:26.4.0:lint-gradle-26.4.0.jar:b8c130d273f522388734457e1b96790f41528fcec6fda9e8eaa4e4d95a07cfbb',
-        'com.android.tools.lint:lint:26.4.0:lint-26.4.0.jar:83aa062fb0405b60ed358d858c8c2955e1bae44a455b498068c6a60988755f00',
-        'com.android.tools:annotations:26.4.0:annotations-26.4.0.jar:a7955b8e19c3a2a861d6faa43a58b7c0d46ea9112188ee3e235c6f9f439ecc1a',
-        'com.android.tools:common:26.4.0:common-26.4.0.jar:ea40b94b3c1284ea7700f011388e2906a8363a66abd902891722b3c557984852',
-        'com.android.tools:dvlib:26.4.0:dvlib-26.4.0.jar:23af89c535b01ba36ceed1b6b309b672814eba624e643cd7dedf0519edad50cc',
-        'com.android.tools:repository:26.4.0:repository-26.4.0.jar:3d1763ab46199374dc6d94129bba11c70f1d5857e2c81a3ac4898abca40b176b',
-        'com.android.tools:sdk-common:26.4.0:sdk-common-26.4.0.jar:78a522525b30ffc6b7bf1299c831d24ce385f68a9f4878f8f752e9baefa31b0f',
-        'com.android.tools:sdklib:26.4.0:sdklib-26.4.0.jar:b854c23892013a326d761cf071c72cf3e038ed0469d10f4a356829fa56e4c132',
-        'com.google.code.findbugs:jsr305:1.3.9:jsr305-1.3.9.jar:905721a0eea90a81534abb7ee6ef4ea2e5e645fa1def0a5cd88402df1b46c9ed',
+        'com.android.tools.analytics-library:protos:26.5.1:protos-26.5.1.jar:8dde1130725461fe827f2a343d353f2b51e8870661fc860d7d5ebddb097ead4e',
+        'com.android.tools.analytics-library:shared:26.5.1:shared-26.5.1.jar:ccc2f3b00ec17b11401610ba68553544fc8fc517120e84439ac6eb86b875e18d',
+        'com.android.tools.analytics-library:tracker:26.5.1:tracker-26.5.1.jar:3a76984c0fe2e847ca7a8b35b4780ef0447a9d1666946cb8e60466318e0ab5ae',
+        'com.android.tools.build:aapt2-proto:0.4.0:aapt2-proto-0.4.0.jar:fac0435e08898f89eeeb9ca236bea707155ff816c12205ced285ad53604133ca',
+        'com.android.tools.build:apksig:3.5.1:apksig-3.5.1.jar:1fd33e7f009a2a0da766cfeec4211a09f548034b015c289a66d75dd8a9302f4a',
+        'com.android.tools.build:apkzlib:3.5.1:apkzlib-3.5.1.jar:9f330167cbe973b7db407692f74f4f6453b7ffa5f2048934b06280c2ceee60fa',
+        'com.android.tools.build:builder-model:3.5.1:builder-model-3.5.1.jar:39ea3c82b76b6e0c9f9fa88d93e0edc1dd4a0f1dfae0ef6fbf2d451da47e5450',
+        'com.android.tools.build:builder-test-api:3.5.1:builder-test-api-3.5.1.jar:a1b59305584cbcaa078fdc9cfb80871012755b822dd32e8da19add6f7bbcb762',
+        'com.android.tools.build:builder:3.5.1:builder-3.5.1.jar:e3a8d382434c5f60990730c4719fc814e85a898a33a1e96c1df8d627d3c6eea6',
+        'com.android.tools.build:gradle-api:3.5.1:gradle-api-3.5.1.jar:be9b41859bace11998f66b04ed944f87e413f3ad6da3c4665587699da125addc',
+        'com.android.tools.build:manifest-merger:26.5.1:manifest-merger-26.5.1.jar:dcad9ecb967251f4d750f55a4204a2b400e8fbfe5cb930a1d0d5dbe10ae8bdfc',
+        'com.android.tools.ddms:ddmlib:26.5.1:ddmlib-26.5.1.jar:b081aef2a4ed3f4d47cae4cdb128469735f25a114e026d37123bf9ffdec742a8',
+        'com.android.tools.external.com-intellij:intellij-core:26.5.1:intellij-core-26.5.1.jar:20eced30adc124805bd93488d9cd9d3e33e6bf7b48e9fe5a703d4983f894d450',
+        'com.android.tools.external.com-intellij:kotlin-compiler:26.5.1:kotlin-compiler-26.5.1.jar:5aed762dd54875b77ae7018d97c05756ff0c5b9fd02ec595dd396ccd14cc22cb',
+        'com.android.tools.external.org-jetbrains:uast:26.5.1:uast-26.5.1.jar:4bc8653d6c0943f40fee963a149e36c6baa45683d2530968a13f5007e3c40740',
+        'com.android.tools.layoutlib:layoutlib-api:26.5.1:layoutlib-api-26.5.1.jar:88732f11396c427273e515d23042e35633f4fe4295528a99b866aa2adf0efd9c',
+        'com.android.tools.lint:lint-api:26.5.1:lint-api-26.5.1.jar:ec33fcd72bfaf70dd841e03fbfd93f109c2e575aec146067c606689c3972f0de',
+        'com.android.tools.lint:lint-checks:26.5.1:lint-checks-26.5.1.jar:a1b9607d484aaae7a71dcecdc76f8003d8239af226c776894a2cf63f9e6c60d7',
+        'com.android.tools.lint:lint-gradle-api:26.5.1:lint-gradle-api-26.5.1.jar:82453fd98a8394cc84ed995c04d2cd744abd1d6589403427ba7eef53115406f3',
+        'com.android.tools.lint:lint-gradle:26.5.1:lint-gradle-26.5.1.jar:59465b56cf7db77c656d5f8195d721c3d48b6bdd0502d774de335bfe4baff00b',
+        'com.android.tools.lint:lint:26.5.1:lint-26.5.1.jar:336e4b04ec6f8b0f25879131b7a7862d77df83a1879ee5b71be26128755f8e2e',
+        'com.android.tools:annotations:26.5.1:annotations-26.5.1.jar:2c43c82f8c59d8f7a61e3239e1a2dc9f69dc342ec09af9b7c9f69b25337c0b6e',
+        'com.android.tools:common:26.5.1:common-26.5.1.jar:eccfa54486ed54c4e3123cc42195d023bd0dd21bcd2f0e4868e8c6fc70f8ef6b',
+        'com.android.tools:dvlib:26.5.1:dvlib-26.5.1.jar:46f93ad498b4756e7d867d2fe38c38890a80e7407a4ae459e4a8c8d5c5aeacfe',
+        'com.android.tools:repository:26.5.1:repository-26.5.1.jar:2b3ee791aa4c3e8ce60498c161a27ca7228816fc630eed4d9f25f2f36a106dce',
+        'com.android.tools:sdk-common:26.5.1:sdk-common-26.5.1.jar:365f749676c3574676fd465177c8a492f340816db2b520d6ed114d3b6e77bea7',
+        'com.android.tools:sdklib:26.5.1:sdklib-26.5.1.jar:007da104afb27c8c682a1628023fe9ec438249c8d15ef0fd6624c5bb8e23b696',
         'com.google.code.findbugs:jsr305:3.0.2:jsr305-3.0.2.jar:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
-        'com.google.code.gson:gson:2.8.0:gson-2.8.0.jar:c6221763bd79c4f1c3dc7f750b5f29a0bb38b367b81314c4f71896e340c40825',
-        'com.google.dagger:dagger-compiler:2.22.1:dagger-compiler-2.22.1.jar:e5f28302cbe70a79d3620cddebfb8ec0736814f3980ffe1e673bfe3342f507d3',
-        'com.google.dagger:dagger-producers:2.22.1:dagger-producers-2.22.1.jar:f834a0082014213a68ff06a0f048d750178d02196c58b0b15beb367d32b97e35',
-        'com.google.dagger:dagger-spi:2.22.1:dagger-spi-2.22.1.jar:4b0b922793b3bcb91b99fabb75dba77c68afd7ae4c5f0c4fd6ba681f0a291c7d',
-        'com.google.dagger:dagger:2.22.1:dagger-2.22.1.jar:329d4340f24c4f5717af016c097e90668bfea2a5376e6aa9964b01cef3fd241a',
-        'com.google.errorprone:error_prone_annotations:2.1.3:error_prone_annotations-2.1.3.jar:03d0329547c13da9e17c634d1049ea2ead093925e290567e1a364fd6b1fc7ff8',
+        'com.google.code.gson:gson:2.8.5:gson-2.8.5.jar:233a0149fc365c9f6edbd683cfe266b19bdc773be98eabdaf6b3c924b48e7d81',
+        'com.google.dagger:dagger-compiler:2.24:dagger-compiler-2.24.jar:3c5afb955fb188da485cb2c048eff37dce0e1530b9780a0f2f7187d16d1ccc1f',
+        'com.google.dagger:dagger-producers:2.24:dagger-producers-2.24.jar:f10f45b95191954d5d6b043fca9e62fb621d21bf70634b8f8476c7988b504c3a',
+        'com.google.dagger:dagger-spi:2.24:dagger-spi-2.24.jar:c038445d14dbcb4054e61bf49e05009edf26fce4fdc7ec1a9db544784f68e718',
+        'com.google.dagger:dagger:2.24:dagger-2.24.jar:550a6e46a6dfcdf1d764887b6090cea94f783327e50e5c73754f18facfc70b64',
+        'com.google.errorprone:error_prone_annotations:2.2.0:error_prone_annotations-2.2.0.jar:6ebd22ca1b9d8ec06d41de8d64e0596981d9607b42035f9ed374f9de271a481a',
         'com.google.errorprone:javac-shaded:9-dev-r4023-3:javac-shaded-9-dev-r4023-3.jar:65bfccf60986c47fbc17c9ebab0be626afc41741e0a6ec7109e0768817a36f30',
         'com.google.googlejavaformat:google-java-format:1.5:google-java-format-1.5.jar:aa19ad7850fb85178aa22f2fddb163b84d6ce4d0035872f30d4408195ca1144e',
-        'com.google.guava:guava:25.0-jre:guava-25.0-jre.jar:3fd4341776428c7e0e5c18a7c10de129475b69ab9d30aeafbb5c277bb6074fa9',
-        'com.google.guava:guava:26.0-jre:guava-26.0-jre.jar:a0e9cabad665bc20bcd2b01f108e5fc03f756e13aea80abaadb9f407033bea2c',
+        'com.google.guava:failureaccess:1.0.1:failureaccess-1.0.1.jar:a171ee4c734dd2da837e4b16be9df4661afab72a41adaf31eb84dfdaf936ca26',
+        'com.google.guava:guava:27.0.1-jre:guava-27.0.1-jre.jar:e1c814fd04492a27c38e0317eabeaa1b3e950ec8010239e400fe90ad6c9107b4',
+        'com.google.guava:guava:27.1-jre:guava-27.1-jre.jar:4a5aa70cc968a4d137e599ad37553e5cfeed2265e8c193476d7119036c536fe7',
+        'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava:listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar:b372a037d4230aa57fbeffdef30fd6123f9c0c2db85d0aced00c91b974f33f99',
         'com.google.j2objc:j2objc-annotations:1.1:j2objc-annotations-1.1.jar:2994a7eb78f2710bd3d3bfb639b2c94e219cedac0d4d084d516e78c16dddecf6',
         'com.google.jimfs:jimfs:1.1:jimfs-1.1.jar:c4828e28d7c0a930af9387510b3bada7daa5c04d7c25a75c7b8b081f1c257ddd',
         'com.google.protobuf:protobuf-java:3.4.0:protobuf-java-3.4.0.jar:dce7e66b32456a1b1198da0caff3a8acb71548658391e798c79369241e6490a4',
@@ -55,6 +57,7 @@ dependencyVerification {
         'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
         'javax.xml.bind:jaxb-api:2.2.12-b140109.1041:jaxb-api-2.2.12-b140109.1041.jar:b5e60cd8b7b5ff01ce4a74c5dd008f4fbd14ced3495d0b47b85cfedc182211f2',
         'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
+        'net.ltgt.gradle.incap:incap:0.2:incap-0.2.jar:b625b9806b0f1e4bc7a2e3457119488de3cd57ea20feedd513db070a573a4ffd',
         'net.sf.jopt-simple:jopt-simple:4.9:jopt-simple-4.9.jar:26c5856e954b5f864db76f13b86919b59c6eecf9fd930b96baa8884626baf2f5',
         'net.sf.kxml:kxml2:2.3.0:kxml2-2.3.0.jar:f264dd9f79a1fde10ce5ecc53221eff24be4c9331c830b7d52f2f08a7b633de2',
         'org.apache.ant:ant-launcher:1.9.4:ant-launcher-1.9.4.jar:7bccea20b41801ca17bcbc909a78c835d0f443f12d639c77bd6ae3d05861608d',
@@ -71,17 +74,17 @@ dependencyVerification {
         'org.checkerframework:checker-compat-qual:2.5.3:checker-compat-qual-2.5.3.jar:d76b9afea61c7c082908023f0cbc1427fab9abd2df915c8b8a3e7a509bccbc6d',
         'org.checkerframework:checker-qual:2.5.2:checker-qual-2.5.2.jar:64b02691c8b9d4e7700f8ee2e742dce7ea2c6e81e662b7522c9ee3bf568c040a',
         'org.codehaus.groovy:groovy-all:2.4.15:groovy-all-2.4.15.jar:51d6c4e71782e85674239189499854359d380fb75e1a703756e3aaa5b98a5af0',
-        'org.codehaus.mojo:animal-sniffer-annotations:1.14:animal-sniffer-annotations-1.14.jar:2068320bd6bad744c3673ab048f67e30bef8f518996fa380033556600669905d',
+        'org.codehaus.mojo:animal-sniffer-annotations:1.17:animal-sniffer-annotations-1.17.jar:92654f493ecfec52082e76354f0ebf87648dc3d5cec2e3c3cdb947c016747a53',
         'org.glassfish.jaxb:jaxb-core:2.2.11:jaxb-core-2.2.11.jar:37bcaee8ebb04362c8352a5bf6221b86967ecdab5164c696b10b9a2bb587b2aa',
         'org.glassfish.jaxb:jaxb-runtime:2.2.11:jaxb-runtime-2.2.11.jar:a874f2351cfba8e2946be3002d10c18a6da8f21b52ba2acf52f2b85d5520ed70',
         'org.glassfish.jaxb:txw2:2.2.11:txw2-2.2.11.jar:272a3ccad45a4511351920cd2a8633c53cab8d5220c7a92954da5526bb5eafea',
         'org.hamcrest:hamcrest-core:1.3:hamcrest-core-1.3.jar:66fdef91e9739348df7a096aa384a5685f4e875584cce89386a7a47251c4d8e9',
         'org.hamcrest:hamcrest-library:1.3:hamcrest-library-1.3.jar:711d64522f9ec410983bd310934296da134be4254a125080a0416ec178dfad1c',
-        'org.jetbrains.kotlin:kotlin-reflect:1.3.21:kotlin-reflect-1.3.21.jar:a3065c822633191e0a3e3ee12a29bec234fc4b2864a6bb87ef48cce3e9e0c26a',
-        'org.jetbrains.kotlin:kotlin-stdlib-common:1.3.21:kotlin-stdlib-common-1.3.21.jar:cea61f7b611895e64f58569a9757fc0ab0d582f107211e1930e0ce2a0add52a7',
-        'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.21:kotlin-stdlib-jdk7-1.3.21.jar:a87875604fd42140da6938ae4d35ee61081f4482536efc6d2615b8b626a198af',
-        'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.21:kotlin-stdlib-jdk8-1.3.21.jar:5823ed66ac122a1c55442ebca5a209a843ccd87f562edc31a787f3d2e47f74d4',
-        'org.jetbrains.kotlin:kotlin-stdlib:1.3.21:kotlin-stdlib-1.3.21.jar:38ba2370d9f06f50433e06b2ca775b94473c2e2785f410926079ab793c72b034',
+        'org.jetbrains.kotlin:kotlin-reflect:1.3.50:kotlin-reflect-1.3.50.jar:64583199ea5a54aefd1bd1595288925f784226ee562d1dd279011c6075b3d7a4',
+        'org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50:kotlin-stdlib-common-1.3.50.jar:8ce678e88e4ba018b66dacecf952471e4d7dfee156a8a819760a5a5ff29d323c',
+        'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.50:kotlin-stdlib-jdk7-1.3.50.jar:9a026639e76212f8d57b86d55b075394c2e009f1979110751d34c05c5f75d57b',
+        'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.50:kotlin-stdlib-jdk8-1.3.50.jar:1b351fb6e09c14b55525c74c1f4cf48942eae43c348b7bc764a5e6e423d4da0c',
+        'org.jetbrains.kotlin:kotlin-stdlib:1.3.50:kotlin-stdlib-1.3.50.jar:e6f05746ee0366d0b52825a090fac474dcf44082c9083bbb205bd16976488d6c',
         'org.jetbrains.trove4j:trove4j:20160824:trove4j-20160824.jar:1917871c8deb468307a584680c87a44572f5a8b0b98c6d397fc0f5f86596dbe7',
         'org.jetbrains:annotations:13.0:annotations-13.0.jar:ace2a10dc8e2d5fd34925ecac03e4988b2c0f851650c94b8cef49ba1bd111478',
         'org.jmock:jmock-junit4:2.8.2:jmock-junit4-2.8.2.jar:f7ee4df4f7bd7b7f1cafad3b99eb74d579f109d5992ff625347352edb55e674c',
diff --git a/bramble-api/build.gradle b/bramble-api/build.gradle
index 67d141f84..9e5cf946a 100644
--- a/bramble-api/build.gradle
+++ b/bramble-api/build.gradle
@@ -7,7 +7,7 @@ apply plugin: 'witness'
 apply from: 'witness.gradle'
 
 dependencies {
-	implementation "com.google.dagger:dagger:2.22.1"
+	implementation "com.google.dagger:dagger:2.24"
 	implementation 'com.google.code.findbugs:jsr305:3.0.2'
 
 	testImplementation 'junit:junit:4.12'
diff --git a/bramble-api/witness.gradle b/bramble-api/witness.gradle
index 4c4fade57..1b9593118 100644
--- a/bramble-api/witness.gradle
+++ b/bramble-api/witness.gradle
@@ -2,7 +2,7 @@ dependencyVerification {
     verify = [
         'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
         'com.google.code.findbugs:jsr305:3.0.2:jsr305-3.0.2.jar:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
-        'com.google.dagger:dagger:2.22.1:dagger-2.22.1.jar:329d4340f24c4f5717af016c097e90668bfea2a5376e6aa9964b01cef3fd241a',
+        'com.google.dagger:dagger:2.24:dagger-2.24.jar:550a6e46a6dfcdf1d764887b6090cea94f783327e50e5c73754f18facfc70b64',
         'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
         'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
         'org.apache.ant:ant-launcher:1.9.4:ant-launcher-1.9.4.jar:7bccea20b41801ca17bcbc909a78c835d0f443f12d639c77bd6ae3d05861608d',
diff --git a/bramble-core/build.gradle b/bramble-core/build.gradle
index fdd1c8eff..ce33f1ad9 100644
--- a/bramble-core/build.gradle
+++ b/bramble-core/build.gradle
@@ -17,7 +17,7 @@ dependencies {
 	implementation 'org.whispersystems:curve25519-java:0.5.0'
 	implementation 'org.briarproject:jtorctl:0.3'
 
-	annotationProcessor 'com.google.dagger:dagger-compiler:2.22.1'
+	annotationProcessor 'com.google.dagger:dagger-compiler:2.24'
 
 	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
 	testImplementation 'org.hsqldb:hsqldb:2.3.5' // The last version that supports Java 1.6
@@ -26,7 +26,7 @@ dependencies {
 	testImplementation "org.jmock:jmock-junit4:2.8.2"
 	testImplementation "org.jmock:jmock-legacy:2.8.2"
 
-	testAnnotationProcessor 'com.google.dagger:dagger-compiler:2.22.1'
+	testAnnotationProcessor 'com.google.dagger:dagger-compiler:2.24'
 
 	signature 'org.codehaus.mojo.signature:java16:1.1@signature'
 }
diff --git a/bramble-core/src/test/java/org/briarproject/bramble/crypto/ScryptKdfTest.java b/bramble-core/src/test/java/org/briarproject/bramble/crypto/ScryptKdfTest.java
index b7356f00a..082c371d3 100644
--- a/bramble-core/src/test/java/org/briarproject/bramble/crypto/ScryptKdfTest.java
+++ b/bramble-core/src/test/java/org/briarproject/bramble/crypto/ScryptKdfTest.java
@@ -4,6 +4,7 @@ import org.briarproject.bramble.api.Bytes;
 import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.system.SystemClock;
+import org.briarproject.bramble.test.ArrayClock;
 import org.briarproject.bramble.test.BrambleTestCase;
 import org.junit.Test;
 
@@ -11,8 +12,6 @@ import java.util.HashSet;
 import java.util.Set;
 
 import static junit.framework.TestCase.assertTrue;
-
-import org.briarproject.bramble.test.ArrayClock;
 import static org.briarproject.bramble.test.TestUtils.getRandomBytes;
 import static org.briarproject.bramble.util.StringUtils.getRandomString;
 import static org.junit.Assert.assertEquals;
diff --git a/bramble-core/witness.gradle b/bramble-core/witness.gradle
index 9dbaca2ee..9ab2fac6d 100644
--- a/bramble-core/witness.gradle
+++ b/bramble-core/witness.gradle
@@ -1,15 +1,17 @@
 dependencyVerification {
     verify = [
         'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
-        'com.google.code.findbugs:jsr305:1.3.9:jsr305-1.3.9.jar:905721a0eea90a81534abb7ee6ef4ea2e5e645fa1def0a5cd88402df1b46c9ed',
-        'com.google.dagger:dagger-compiler:2.22.1:dagger-compiler-2.22.1.jar:e5f28302cbe70a79d3620cddebfb8ec0736814f3980ffe1e673bfe3342f507d3',
-        'com.google.dagger:dagger-producers:2.22.1:dagger-producers-2.22.1.jar:f834a0082014213a68ff06a0f048d750178d02196c58b0b15beb367d32b97e35',
-        'com.google.dagger:dagger-spi:2.22.1:dagger-spi-2.22.1.jar:4b0b922793b3bcb91b99fabb75dba77c68afd7ae4c5f0c4fd6ba681f0a291c7d',
-        'com.google.dagger:dagger:2.22.1:dagger-2.22.1.jar:329d4340f24c4f5717af016c097e90668bfea2a5376e6aa9964b01cef3fd241a',
-        'com.google.errorprone:error_prone_annotations:2.1.3:error_prone_annotations-2.1.3.jar:03d0329547c13da9e17c634d1049ea2ead093925e290567e1a364fd6b1fc7ff8',
+        'com.google.code.findbugs:jsr305:3.0.2:jsr305-3.0.2.jar:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
+        'com.google.dagger:dagger-compiler:2.24:dagger-compiler-2.24.jar:3c5afb955fb188da485cb2c048eff37dce0e1530b9780a0f2f7187d16d1ccc1f',
+        'com.google.dagger:dagger-producers:2.24:dagger-producers-2.24.jar:f10f45b95191954d5d6b043fca9e62fb621d21bf70634b8f8476c7988b504c3a',
+        'com.google.dagger:dagger-spi:2.24:dagger-spi-2.24.jar:c038445d14dbcb4054e61bf49e05009edf26fce4fdc7ec1a9db544784f68e718',
+        'com.google.dagger:dagger:2.24:dagger-2.24.jar:550a6e46a6dfcdf1d764887b6090cea94f783327e50e5c73754f18facfc70b64',
+        'com.google.errorprone:error_prone_annotations:2.2.0:error_prone_annotations-2.2.0.jar:6ebd22ca1b9d8ec06d41de8d64e0596981d9607b42035f9ed374f9de271a481a',
         'com.google.errorprone:javac-shaded:9-dev-r4023-3:javac-shaded-9-dev-r4023-3.jar:65bfccf60986c47fbc17c9ebab0be626afc41741e0a6ec7109e0768817a36f30',
         'com.google.googlejavaformat:google-java-format:1.5:google-java-format-1.5.jar:aa19ad7850fb85178aa22f2fddb163b84d6ce4d0035872f30d4408195ca1144e',
-        'com.google.guava:guava:25.0-jre:guava-25.0-jre.jar:3fd4341776428c7e0e5c18a7c10de129475b69ab9d30aeafbb5c277bb6074fa9',
+        'com.google.guava:failureaccess:1.0.1:failureaccess-1.0.1.jar:a171ee4c734dd2da837e4b16be9df4661afab72a41adaf31eb84dfdaf936ca26',
+        'com.google.guava:guava:27.1-jre:guava-27.1-jre.jar:4a5aa70cc968a4d137e599ad37553e5cfeed2265e8c193476d7119036c536fe7',
+        'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava:listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar:b372a037d4230aa57fbeffdef30fd6123f9c0c2db85d0aced00c91b974f33f99',
         'com.google.j2objc:j2objc-annotations:1.1:j2objc-annotations-1.1.jar:2994a7eb78f2710bd3d3bfb639b2c94e219cedac0d4d084d516e78c16dddecf6',
         'com.h2database:h2:1.4.192:h2-1.4.192.jar:225b22e9857235c46c93861410b60b8c81c10dc8985f4faf188985ba5445126c',
         'com.madgag.spongycastle:core:1.58.0.0:core-1.58.0.0.jar:199617dd5698c5a9312b898c0a4cec7ce9dd8649d07f65d91629f58229d72728',
@@ -18,14 +20,16 @@ dependencyVerification {
         'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
         'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
         'net.i2p.crypto:eddsa:0.2.0:eddsa-0.2.0.jar:a7cb1b85c16e2f0730b9204106929a1d9aaae1df728adc7041a8b8b605692140',
+        'net.ltgt.gradle.incap:incap:0.2:incap-0.2.jar:b625b9806b0f1e4bc7a2e3457119488de3cd57ea20feedd513db070a573a4ffd',
         'org.apache.ant:ant-launcher:1.9.4:ant-launcher-1.9.4.jar:7bccea20b41801ca17bcbc909a78c835d0f443f12d639c77bd6ae3d05861608d',
         'org.apache.ant:ant:1.9.4:ant-1.9.4.jar:649ae0730251de07b8913f49286d46bba7b92d47c5f332610aa426c4f02161d8',
         'org.beanshell:bsh:1.3.0:bsh-1.3.0.jar:9b04edc75d19db54f1b4e8b5355e9364384c6cf71eb0a1b9724c159d779879f8',
         'org.bitlet:weupnp:0.1.4:weupnp-0.1.4.jar:88df7e6504929d00bdb832863761385c68ab92af945b04f0770b126270a444fb',
         'org.briarproject:jtorctl:0.3:jtorctl-0.3.jar:f2939238a097898998432effe93b0334d97a787972ab3a91a8973a1d309fc864',
         'org.checkerframework:checker-compat-qual:2.5.3:checker-compat-qual-2.5.3.jar:d76b9afea61c7c082908023f0cbc1427fab9abd2df915c8b8a3e7a509bccbc6d',
+        'org.checkerframework:checker-qual:2.5.2:checker-qual-2.5.2.jar:64b02691c8b9d4e7700f8ee2e742dce7ea2c6e81e662b7522c9ee3bf568c040a',
         'org.codehaus.mojo.signature:java16:1.1:java16-1.1.signature:53799223a2c98dba2d0add810bed76315460df285c69e4f397ae6098f87dd619',
-        'org.codehaus.mojo:animal-sniffer-annotations:1.14:animal-sniffer-annotations-1.14.jar:2068320bd6bad744c3673ab048f67e30bef8f518996fa380033556600669905d',
+        'org.codehaus.mojo:animal-sniffer-annotations:1.17:animal-sniffer-annotations-1.17.jar:92654f493ecfec52082e76354f0ebf87648dc3d5cec2e3c3cdb947c016747a53',
         'org.codehaus.mojo:animal-sniffer-ant-tasks:1.16:animal-sniffer-ant-tasks-1.16.jar:890040976fbe2d584619a6a61b1fd2e925b3b5eb342a85eb2762c467c0d64e90',
         'org.codehaus.mojo:animal-sniffer:1.16:animal-sniffer-1.16.jar:72be8bcc226ba43b937c722a08a07852bfa1b11400089265d5df0ee7b38b1d52',
         'org.hamcrest:hamcrest-core:1.3:hamcrest-core-1.3.jar:66fdef91e9739348df7a096aa384a5685f4e875584cce89386a7a47251c4d8e9',
diff --git a/bramble-java/build.gradle b/bramble-java/build.gradle
index 6a130f8d5..dbdd13ba6 100644
--- a/bramble-java/build.gradle
+++ b/bramble-java/build.gradle
@@ -19,7 +19,7 @@ dependencies {
 	tor 'org.briarproject:tor:0.3.5.8@zip'
 	tor 'org.briarproject:obfs4proxy:0.0.7@zip'
 
-	annotationProcessor 'com.google.dagger:dagger-compiler:2.22.1'
+	annotationProcessor 'com.google.dagger:dagger-compiler:2.24'
 
 	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
 	testImplementation project(path: ':bramble-core', configuration: 'testOutput')
@@ -28,7 +28,7 @@ dependencies {
 	testImplementation "org.jmock:jmock-junit4:2.8.2"
 	testImplementation "org.jmock:jmock-legacy:2.8.2"
 
-	testAnnotationProcessor 'com.google.dagger:dagger-compiler:2.22.1'
+	testAnnotationProcessor 'com.google.dagger:dagger-compiler:2.24'
 }
 
 def torBinariesDir = 'src/main/resources'
diff --git a/bramble-java/witness.gradle b/bramble-java/witness.gradle
index 979f3e870..91b7b66da 100644
--- a/bramble-java/witness.gradle
+++ b/bramble-java/witness.gradle
@@ -1,15 +1,17 @@
 dependencyVerification {
     verify = [
         'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
-        'com.google.code.findbugs:jsr305:1.3.9:jsr305-1.3.9.jar:905721a0eea90a81534abb7ee6ef4ea2e5e645fa1def0a5cd88402df1b46c9ed',
-        'com.google.dagger:dagger-compiler:2.22.1:dagger-compiler-2.22.1.jar:e5f28302cbe70a79d3620cddebfb8ec0736814f3980ffe1e673bfe3342f507d3',
-        'com.google.dagger:dagger-producers:2.22.1:dagger-producers-2.22.1.jar:f834a0082014213a68ff06a0f048d750178d02196c58b0b15beb367d32b97e35',
-        'com.google.dagger:dagger-spi:2.22.1:dagger-spi-2.22.1.jar:4b0b922793b3bcb91b99fabb75dba77c68afd7ae4c5f0c4fd6ba681f0a291c7d',
-        'com.google.dagger:dagger:2.22.1:dagger-2.22.1.jar:329d4340f24c4f5717af016c097e90668bfea2a5376e6aa9964b01cef3fd241a',
-        'com.google.errorprone:error_prone_annotations:2.1.3:error_prone_annotations-2.1.3.jar:03d0329547c13da9e17c634d1049ea2ead093925e290567e1a364fd6b1fc7ff8',
+        'com.google.code.findbugs:jsr305:3.0.2:jsr305-3.0.2.jar:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
+        'com.google.dagger:dagger-compiler:2.24:dagger-compiler-2.24.jar:3c5afb955fb188da485cb2c048eff37dce0e1530b9780a0f2f7187d16d1ccc1f',
+        'com.google.dagger:dagger-producers:2.24:dagger-producers-2.24.jar:f10f45b95191954d5d6b043fca9e62fb621d21bf70634b8f8476c7988b504c3a',
+        'com.google.dagger:dagger-spi:2.24:dagger-spi-2.24.jar:c038445d14dbcb4054e61bf49e05009edf26fce4fdc7ec1a9db544784f68e718',
+        'com.google.dagger:dagger:2.24:dagger-2.24.jar:550a6e46a6dfcdf1d764887b6090cea94f783327e50e5c73754f18facfc70b64',
+        'com.google.errorprone:error_prone_annotations:2.2.0:error_prone_annotations-2.2.0.jar:6ebd22ca1b9d8ec06d41de8d64e0596981d9607b42035f9ed374f9de271a481a',
         'com.google.errorprone:javac-shaded:9-dev-r4023-3:javac-shaded-9-dev-r4023-3.jar:65bfccf60986c47fbc17c9ebab0be626afc41741e0a6ec7109e0768817a36f30',
         'com.google.googlejavaformat:google-java-format:1.5:google-java-format-1.5.jar:aa19ad7850fb85178aa22f2fddb163b84d6ce4d0035872f30d4408195ca1144e',
-        'com.google.guava:guava:25.0-jre:guava-25.0-jre.jar:3fd4341776428c7e0e5c18a7c10de129475b69ab9d30aeafbb5c277bb6074fa9',
+        'com.google.guava:failureaccess:1.0.1:failureaccess-1.0.1.jar:a171ee4c734dd2da837e4b16be9df4661afab72a41adaf31eb84dfdaf936ca26',
+        'com.google.guava:guava:27.1-jre:guava-27.1-jre.jar:4a5aa70cc968a4d137e599ad37553e5cfeed2265e8c193476d7119036c536fe7',
+        'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava:listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar:b372a037d4230aa57fbeffdef30fd6123f9c0c2db85d0aced00c91b974f33f99',
         'com.google.j2objc:j2objc-annotations:1.1:j2objc-annotations-1.1.jar:2994a7eb78f2710bd3d3bfb639b2c94e219cedac0d4d084d516e78c16dddecf6',
         'com.squareup:javapoet:1.11.1:javapoet-1.11.1.jar:9cbf2107be499ec6e95afd36b58e3ca122a24166cdd375732e51267d64058e90',
         'javax.annotation:jsr250-api:1.0:jsr250-api-1.0.jar:a1a922d0d9b6d183ed3800dfac01d1e1eb159f0e8c6f94736931c1def54a941f',
@@ -17,13 +19,15 @@ dependencyVerification {
         'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
         'net.java.dev.jna:jna-platform:4.5.2:jna-platform-4.5.2.jar:f1d00c167d8921c6e23c626ef9f1c3ae0be473c95c68ffa012bc7ae55a87e2d6',
         'net.java.dev.jna:jna:4.5.2:jna-4.5.2.jar:0c8eb7acf67261656d79005191debaba3b6bf5dd60a43735a245429381dbecff',
+        'net.ltgt.gradle.incap:incap:0.2:incap-0.2.jar:b625b9806b0f1e4bc7a2e3457119488de3cd57ea20feedd513db070a573a4ffd',
         'org.apache.ant:ant-launcher:1.9.4:ant-launcher-1.9.4.jar:7bccea20b41801ca17bcbc909a78c835d0f443f12d639c77bd6ae3d05861608d',
         'org.apache.ant:ant:1.9.4:ant-1.9.4.jar:649ae0730251de07b8913f49286d46bba7b92d47c5f332610aa426c4f02161d8',
         'org.beanshell:bsh:1.3.0:bsh-1.3.0.jar:9b04edc75d19db54f1b4e8b5355e9364384c6cf71eb0a1b9724c159d779879f8',
         'org.briarproject:obfs4proxy:0.0.7:obfs4proxy-0.0.7.zip:5b2f693262ce43a7e130f7cc7d5d1617925330640a2eb6d71085e95df8ee0642',
         'org.briarproject:tor:0.3.5.8:tor-0.3.5.8.zip:96e83391f01984f28669235fc02fbb0243140a2b3b2c73aeffd0042c8d3ced18',
         'org.checkerframework:checker-compat-qual:2.5.3:checker-compat-qual-2.5.3.jar:d76b9afea61c7c082908023f0cbc1427fab9abd2df915c8b8a3e7a509bccbc6d',
-        'org.codehaus.mojo:animal-sniffer-annotations:1.14:animal-sniffer-annotations-1.14.jar:2068320bd6bad744c3673ab048f67e30bef8f518996fa380033556600669905d',
+        'org.checkerframework:checker-qual:2.5.2:checker-qual-2.5.2.jar:64b02691c8b9d4e7700f8ee2e742dce7ea2c6e81e662b7522c9ee3bf568c040a',
+        'org.codehaus.mojo:animal-sniffer-annotations:1.17:animal-sniffer-annotations-1.17.jar:92654f493ecfec52082e76354f0ebf87648dc3d5cec2e3c3cdb947c016747a53',
         'org.hamcrest:hamcrest-core:1.3:hamcrest-core-1.3.jar:66fdef91e9739348df7a096aa384a5685f4e875584cce89386a7a47251c4d8e9',
         'org.hamcrest:hamcrest-library:1.3:hamcrest-library-1.3.jar:711d64522f9ec410983bd310934296da134be4254a125080a0416ec178dfad1c',
         'org.jmock:jmock-junit4:2.8.2:jmock-junit4-2.8.2.jar:f7ee4df4f7bd7b7f1cafad3b99eb74d579f109d5992ff625347352edb55e674c',
diff --git a/briar-android/build.gradle b/briar-android/build.gradle
index b71bfbd3d..6d2fb419e 100644
--- a/briar-android/build.gradle
+++ b/briar-android/build.gradle
@@ -16,8 +16,8 @@ def getStdout = { command, defaultValue ->
 }
 
 android {
-	compileSdkVersion 28
-	buildToolsVersion '28.0.3'
+	compileSdkVersion 29
+	buildToolsVersion '29.0.2'
 
 	defaultConfig {
 		minSdkVersion 16
@@ -82,6 +82,8 @@ android {
 		warning 'MissingTranslation'
 		warning 'ImpliedQuantity'
 		warning 'ExtraTranslation'
+		// FIXME
+		warning 'InvalidPackage'
 	}
 }
 
@@ -90,66 +92,59 @@ dependencies {
 	implementation project(path: ':bramble-core', configuration: 'default')
 	implementation project(':bramble-android')
 
-	def supportVersion = '28.0.0'
-	implementation "com.android.support:support-v4:$supportVersion"
-	implementation("com.android.support:appcompat-v7:$supportVersion") {
-		exclude module: 'support-v4'
-	}
-	implementation("com.android.support:preference-v14:$supportVersion") {
-		exclude module: 'support-v4'
-	}
-	implementation("com.android.support:design:$supportVersion") {
-		exclude module: 'support-v4'
-		exclude module: 'recyclerview-v7'
-	}
-	implementation "com.android.support:cardview-v7:$supportVersion"
-	implementation "com.android.support:support-annotations:$supportVersion"
-	implementation "com.android.support:exifinterface:$supportVersion"
-	implementation 'com.android.support.constraint:constraint-layout:1.1.3'
-	implementation "android.arch.lifecycle:extensions:1.1.1"
+	implementation 'androidx.preference:preference:1.1.0'
+	implementation 'androidx.exifinterface:exifinterface:1.0.0'
+	implementation 'androidx.lifecycle:lifecycle-extensions:2.1.0'
+	implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+	implementation 'com.google.android.material:material:1.1.0-beta01'
 
-	implementation('ch.acra:acra:4.11') {
-		exclude module: 'support-v4'
-		exclude module: 'support-annotations'
-	}
-	implementation 'info.guardianproject.panic:panic:0.5'
+	implementation 'ch.acra:acra:4.11'
+	implementation 'info.guardianproject.panic:panic:1.0'
 	implementation 'info.guardianproject.trustedintents:trustedintents:0.2'
-	implementation 'de.hdodenhof:circleimageview:2.2.0'
-	implementation 'com.google.zxing:core:3.3.3'
-	implementation 'uk.co.samuelwall:material-tap-target-prompt:2.14.0'
-	implementation 'com.vanniktech:emoji-google:0.6.0' // later versions already use androidx
-	implementation 'com.github.kobakei:MaterialFabSpeedDial:1.2.1' // later versions already use androidx
-	def glideVersion = '4.9.0'
+	implementation 'de.hdodenhof:circleimageview:3.0.1'
+	implementation 'com.google.zxing:core:3.3.3'  // newer version need minSdk 24
+	implementation 'uk.co.samuelwall:material-tap-target-prompt:3.0.0'
+	implementation 'com.vanniktech:emoji-google:0.6.0'
+	implementation 'com.github.kobakei:MaterialFabSpeedDial:1.2.1'
+	implementation 'com.github.chrisbanes:PhotoView:2.3.0'
+	def glideVersion = '4.10.0'
 	implementation("com.github.bumptech.glide:glide:$glideVersion") {
 		exclude group: 'com.android.support'
 		exclude module: 'disklrucache' // when there's no disk cache, we can't accidentally use it
 	}
-	implementation 'com.github.chrisbanes:PhotoView:2.1.4' // later versions already use androidx
 
-	annotationProcessor 'com.google.dagger:dagger-compiler:2.22.1'
+	annotationProcessor 'com.google.dagger:dagger-compiler:2.24'
 	annotationProcessor "com.github.bumptech.glide:compiler:$glideVersion"
 
 	compileOnly 'javax.annotation:jsr250-api:1.0'
 
+	def espressoVersion = '3.2.0'
+	def jmockVersion = '2.8.2'
 	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
 	testImplementation project(path: ':bramble-core', configuration: 'testOutput')
-	testImplementation 'org.robolectric:robolectric:4.0.1'
-	testImplementation 'org.robolectric:shadows-support-v4:3.3.2'
-	testImplementation 'org.mockito:mockito-core:2.25.0'
+	testImplementation 'androidx.test:runner:1.2.0'
+	testImplementation 'androidx.test.ext:junit:1.1.1'
+	testImplementation 'androidx.fragment:fragment-testing:1.1.0'
+	testImplementation "androidx.test.espresso:espresso-core:$espressoVersion"
+	testImplementation 'org.robolectric:robolectric:4.3.1'
+	testImplementation 'org.mockito:mockito-core:3.1.0'
 	testImplementation 'junit:junit:4.12'
-	testImplementation "org.jmock:jmock:2.8.2"
-	testImplementation "org.jmock:jmock-junit4:2.8.2"
-	testImplementation "org.jmock:jmock-legacy:2.8.2"
+	testImplementation "org.jmock:jmock:$jmockVersion"
+	testImplementation "org.jmock:jmock-junit4:$jmockVersion"
+	testImplementation "org.jmock:jmock-legacy:$jmockVersion"
 
-	def espressoVersion = '3.0.2'
-	androidTestImplementation "com.android.support.test.espresso:espresso-core:$espressoVersion"
-	androidTestImplementation "com.android.support.test.espresso:espresso-contrib:$espressoVersion"
-	androidTestImplementation "com.android.support.test.espresso:espresso-intents:$espressoVersion"
-	androidTestAnnotationProcessor "com.google.dagger:dagger-compiler:2.22.1"
+	androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+	androidTestImplementation "androidx.test.espresso:espresso-core:$espressoVersion"
+	androidTestImplementation "androidx.test.espresso:espresso-contrib:$espressoVersion"
+	androidTestImplementation "androidx.test.espresso:espresso-intents:$espressoVersion"
+	androidTestAnnotationProcessor "com.google.dagger:dagger-compiler:2.24"
 	androidTestCompileOnly 'javax.annotation:jsr250-api:1.0'
 	androidTestImplementation 'junit:junit:4.12'
-	androidTestScreenshotImplementation "tools.fastlane:screengrab:1.2.0"
-	androidTestScreenshotImplementation "com.android.support.test.uiautomator:uiautomator-v18:2.1.3"
+	androidTestScreenshotImplementation('tools.fastlane:screengrab:1.2.0') {
+		// workaround for jetifier issue https://issuetracker.google.com/issues/123060356
+		exclude group: 'com.android.support.test.uiautomator'
+	}
+	androidTestScreenshotImplementation 'androidx.test.uiautomator:uiautomator:2.2.0'
 }
 
 task verifyTranslations {
diff --git a/briar-android/src/androidTest/java/org/briarproject/briar/android/BriarTestComponentApplication.java b/briar-android/src/androidTest/java/org/briarproject/briar/android/BriarTestComponentApplication.java
index c6481bad6..5e4cf342e 100644
--- a/briar-android/src/androidTest/java/org/briarproject/briar/android/BriarTestComponentApplication.java
+++ b/briar-android/src/androidTest/java/org/briarproject/briar/android/BriarTestComponentApplication.java
@@ -12,7 +12,7 @@ public class BriarTestComponentApplication extends BriarApplicationImpl {
 				.appModule(new AppModule(this)).build();
 		// We need to load the eager singletons directly after making the
 		// dependency graphs
-		BrambleCoreModule.initEagerSingletons(component);
+		BrambleCoreModule.initEagerSingletons(component);  // FIXME AbstractMethodError
 		BrambleAndroidModule.initEagerSingletons(component);
 		BriarCoreModule.initEagerSingletons(component);
 		AndroidEagerSingletons.initEagerSingletons(component);
diff --git a/briar-android/src/androidTest/java/org/briarproject/briar/android/BriarTestRunner.java b/briar-android/src/androidTest/java/org/briarproject/briar/android/BriarTestRunner.java
index 4d1081b42..bc28e0c7e 100644
--- a/briar-android/src/androidTest/java/org/briarproject/briar/android/BriarTestRunner.java
+++ b/briar-android/src/androidTest/java/org/briarproject/briar/android/BriarTestRunner.java
@@ -2,7 +2,8 @@ package org.briarproject.briar.android;
 
 import android.app.Application;
 import android.content.Context;
-import android.support.test.runner.AndroidJUnitRunner;
+
+import androidx.test.runner.AndroidJUnitRunner;
 
 public class BriarTestRunner extends AndroidJUnitRunner {
 
diff --git a/briar-android/src/androidTest/java/org/briarproject/briar/android/UiTest.java b/briar-android/src/androidTest/java/org/briarproject/briar/android/UiTest.java
index 7d9249cfb..ce6899901 100644
--- a/briar-android/src/androidTest/java/org/briarproject/briar/android/UiTest.java
+++ b/briar-android/src/androidTest/java/org/briarproject/briar/android/UiTest.java
@@ -2,7 +2,6 @@ package org.briarproject.briar.android;
 
 import android.app.Activity;
 import android.content.Intent;
-import android.support.test.espresso.intent.rule.IntentsTestRule;
 
 import org.briarproject.bramble.api.account.AccountManager;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
@@ -12,13 +11,16 @@ import org.briarproject.briar.R;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
-import static android.support.test.InstrumentationRegistry.getTargetContext;
+import androidx.test.espresso.intent.rule.IntentsTestRule;
+
+import static androidx.test.core.app.ApplicationProvider.getApplicationContext;
+
 
 @SuppressWarnings("WeakerAccess")
 public abstract class UiTest {
 
 	protected final String USERNAME =
-			getTargetContext().getString(R.string.screenshot_alice);
+			getApplicationContext().getString(R.string.screenshot_alice);
 	protected static final String PASSWORD = "123456";
 
 	@Inject
@@ -27,9 +29,7 @@ public abstract class UiTest {
 	protected LifecycleManager lifecycleManager;
 
 	public UiTest() {
-		BriarTestComponentApplication app =
-				(BriarTestComponentApplication) getTargetContext()
-						.getApplicationContext();
+		BriarTestComponentApplication app = getApplicationContext();
 		inject((BriarUiTestComponent) app.getApplicationComponent());
 	}
 
@@ -64,8 +64,8 @@ public abstract class UiTest {
 			accountManager.createAccount(USERNAME, PASSWORD);
 			if (runnable != null) {
 				Intent serviceIntent =
-						new Intent(getTargetContext(), BriarService.class);
-				getTargetContext().startService(serviceIntent);
+						new Intent(getApplicationContext(), BriarService.class);
+				getApplicationContext().startService(serviceIntent);
 				try {
 					lifecycleManager.waitForStartup();
 				} catch (InterruptedException e) {
diff --git a/briar-android/src/androidTest/java/org/briarproject/briar/android/ViewActions.java b/briar-android/src/androidTest/java/org/briarproject/briar/android/ViewActions.java
index ac3edab65..dc71aded2 100644
--- a/briar-android/src/androidTest/java/org/briarproject/briar/android/ViewActions.java
+++ b/briar-android/src/androidTest/java/org/briarproject/briar/android/ViewActions.java
@@ -1,21 +1,22 @@
 package org.briarproject.briar.android;
 
 import android.app.Activity;
-import android.support.test.espresso.PerformException;
-import android.support.test.espresso.UiController;
-import android.support.test.espresso.ViewAction;
-import android.support.test.runner.lifecycle.ActivityLifecycleMonitor;
-import android.support.test.runner.lifecycle.ActivityLifecycleMonitorRegistry;
-import android.support.test.runner.lifecycle.Stage;
 import android.view.View;
 
 import org.hamcrest.Matcher;
 
 import java.util.concurrent.TimeoutException;
 
-import static android.support.test.espresso.matcher.ViewMatchers.isDisplayed;
-import static android.support.test.espresso.util.HumanReadables.describe;
-import static android.support.test.espresso.util.TreeIterables.breadthFirstViewTraversal;
+import androidx.test.espresso.PerformException;
+import androidx.test.espresso.UiController;
+import androidx.test.espresso.ViewAction;
+import androidx.test.runner.lifecycle.ActivityLifecycleMonitor;
+import androidx.test.runner.lifecycle.ActivityLifecycleMonitorRegistry;
+import androidx.test.runner.lifecycle.Stage;
+
+import static androidx.test.espresso.matcher.ViewMatchers.isDisplayed;
+import static androidx.test.espresso.util.HumanReadables.describe;
+import static androidx.test.espresso.util.TreeIterables.breadthFirstViewTraversal;
 import static java.lang.System.currentTimeMillis;
 import static java.util.concurrent.TimeUnit.SECONDS;
 
diff --git a/briar-android/src/androidTestOfficial/java/org/briarproject/briar/android/attachment/AttachmentRetrieverIntegrationTest.java b/briar-android/src/androidTestOfficial/java/org/briarproject/briar/android/attachment/AttachmentRetrieverIntegrationTest.java
index 29a0ecab5..aa21c0913 100644
--- a/briar-android/src/androidTestOfficial/java/org/briarproject/briar/android/attachment/AttachmentRetrieverIntegrationTest.java
+++ b/briar-android/src/androidTestOfficial/java/org/briarproject/briar/android/attachment/AttachmentRetrieverIntegrationTest.java
@@ -1,8 +1,6 @@
 package org.briarproject.briar.android.attachment;
 
 import android.content.res.AssetManager;
-import android.support.test.InstrumentationRegistry;
-import android.support.test.runner.AndroidJUnit4;
 
 import org.briarproject.bramble.api.UniqueId;
 import org.briarproject.bramble.api.sync.MessageId;
@@ -16,6 +14,9 @@ import java.io.InputStream;
 import java.net.URL;
 import java.util.Random;
 
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import static androidx.test.core.app.ApplicationProvider.getApplicationContext;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -264,7 +265,7 @@ public class AttachmentRetrieverIntegrationTest {
 	}
 
 	private InputStream getAssetInputStream(String name) throws IOException {
-		AssetManager assets = InstrumentationRegistry.getContext().getAssets();
+		AssetManager assets = getApplicationContext().getAssets();
 		return assets.open(name);
 	}
 
diff --git a/briar-android/src/androidTestOfficial/java/org/briarproject/briar/android/conversation/ConversationActivityNotSignedInTest.java b/briar-android/src/androidTestOfficial/java/org/briarproject/briar/android/conversation/ConversationActivityNotSignedInTest.java
index 685a26efa..be1ce09c4 100644
--- a/briar-android/src/androidTestOfficial/java/org/briarproject/briar/android/conversation/ConversationActivityNotSignedInTest.java
+++ b/briar-android/src/androidTestOfficial/java/org/briarproject/briar/android/conversation/ConversationActivityNotSignedInTest.java
@@ -2,18 +2,19 @@ package org.briarproject.briar.android.conversation;
 
 import android.content.Context;
 import android.content.Intent;
-import android.support.test.rule.ActivityTestRule;
-import android.support.test.runner.AndroidJUnit4;
 
 import org.briarproject.briar.R;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import static android.support.test.InstrumentationRegistry.getInstrumentation;
-import static android.support.test.espresso.Espresso.onView;
-import static android.support.test.espresso.matcher.ViewMatchers.isDisplayed;
-import static android.support.test.espresso.matcher.ViewMatchers.withText;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.rule.ActivityTestRule;
+
+import static androidx.test.espresso.Espresso.onView;
+import static androidx.test.espresso.matcher.ViewMatchers.isDisplayed;
+import static androidx.test.espresso.matcher.ViewMatchers.withText;
+import static androidx.test.platform.app.InstrumentationRegistry.getInstrumentation;
 import static org.briarproject.briar.android.ViewActions.waitUntilMatches;
 import static org.briarproject.briar.android.conversation.ConversationActivity.CONTACT_ID;
 
diff --git a/briar-android/src/androidTestOfficial/java/org/briarproject/briar/android/navdrawer/NavDrawerActivityTest.java b/briar-android/src/androidTestOfficial/java/org/briarproject/briar/android/navdrawer/NavDrawerActivityTest.java
index 5d55f2600..133e5721b 100644
--- a/briar-android/src/androidTestOfficial/java/org/briarproject/briar/android/navdrawer/NavDrawerActivityTest.java
+++ b/briar-android/src/androidTestOfficial/java/org/briarproject/briar/android/navdrawer/NavDrawerActivityTest.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.navdrawer;
 
-import android.support.test.espresso.contrib.DrawerActions;
-import android.support.test.runner.AndroidJUnit4;
 import android.view.Gravity;
 
 import org.briarproject.briar.R;
@@ -12,15 +10,18 @@ import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import static android.support.test.espresso.Espresso.onView;
-import static android.support.test.espresso.action.ViewActions.click;
-import static android.support.test.espresso.assertion.ViewAssertions.matches;
-import static android.support.test.espresso.contrib.DrawerMatchers.isClosed;
-import static android.support.test.espresso.intent.Intents.intended;
-import static android.support.test.espresso.intent.matcher.IntentMatchers.hasComponent;
-import static android.support.test.espresso.matcher.ViewMatchers.isDisplayed;
-import static android.support.test.espresso.matcher.ViewMatchers.withId;
-import static android.support.test.espresso.matcher.ViewMatchers.withText;
+import androidx.test.espresso.contrib.DrawerActions;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import static androidx.test.espresso.Espresso.onView;
+import static androidx.test.espresso.action.ViewActions.click;
+import static androidx.test.espresso.assertion.ViewAssertions.matches;
+import static androidx.test.espresso.contrib.DrawerMatchers.isClosed;
+import static androidx.test.espresso.intent.Intents.intended;
+import static androidx.test.espresso.intent.matcher.IntentMatchers.hasComponent;
+import static androidx.test.espresso.matcher.ViewMatchers.isDisplayed;
+import static androidx.test.espresso.matcher.ViewMatchers.withId;
+import static androidx.test.espresso.matcher.ViewMatchers.withText;
 
 @RunWith(AndroidJUnit4.class)
 public class NavDrawerActivityTest extends UiTest {
diff --git a/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/BriarUiTestComponent.java b/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/BriarUiTestComponent.java
index 860166099..618e025d9 100644
--- a/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/BriarUiTestComponent.java
+++ b/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/BriarUiTestComponent.java
@@ -4,7 +4,8 @@ import org.briarproject.bramble.BrambleAndroidModule;
 import org.briarproject.bramble.BrambleCoreModule;
 import org.briarproject.bramble.account.BriarAccountModule;
 import org.briarproject.briar.BriarCoreModule;
-import org.briarproject.briar.android.contact.ConversationActivityScreenshotTest;
+import org.briarproject.briar.android.attachment.AttachmentModule;
+import org.briarproject.briar.android.conversation.ConversationActivityScreenshotTest;
 import org.briarproject.briar.android.settings.SettingsActivityScreenshotTest;
 
 import javax.inject.Singleton;
@@ -14,6 +15,7 @@ import dagger.Component;
 @Singleton
 @Component(modules = {
 		AppModule.class,
+		AttachmentModule.class,
 		BriarCoreModule.class,
 		BrambleAndroidModule.class,
 		BriarAccountModule.class,
diff --git a/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/ScreenshotTest.java b/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/ScreenshotTest.java
index 2fcaf9c2e..c1d040235 100644
--- a/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/ScreenshotTest.java
+++ b/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/ScreenshotTest.java
@@ -30,7 +30,8 @@ public abstract class ScreenshotTest extends UiTest {
 		try {
 			Screengrab.screenshot(name, new FalconScreenshotStrategy(activity));
 		} catch (RuntimeException e) {
-			if (!e.getMessage().equals("Unable to capture screenshot."))
+			if (e.getMessage() == null ||
+					!e.getMessage().equals("Unable to capture screenshot."))
 				throw e;
 			// The tests should still pass when run from AndroidStudio
 			// without manually granting permissions like fastlane does.
diff --git a/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/SetupDataTest.java b/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/SetupDataTest.java
index 53b5d308f..ee47bf86f 100644
--- a/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/SetupDataTest.java
+++ b/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/SetupDataTest.java
@@ -1,36 +1,31 @@
 package org.briarproject.briar.android;
 
-import android.support.test.espresso.intent.rule.IntentsTestRule;
-import android.support.test.runner.AndroidJUnit4;
-import android.support.test.uiautomator.UiDevice;
-import android.support.test.uiautomator.UiObject;
-import android.support.test.uiautomator.UiSelector;
+import android.content.Context;
 
-import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.contact.Contact;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.briar.R;
-import org.briarproject.briar.android.login.OpenDatabaseActivity;
-import org.briarproject.briar.android.login.SetupActivity;
+import org.briarproject.briar.android.account.SetupActivity;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import static android.support.test.InstrumentationRegistry.getInstrumentation;
-import static android.support.test.InstrumentationRegistry.getTargetContext;
-import static android.support.test.espresso.Espresso.onView;
-import static android.support.test.espresso.action.ViewActions.click;
-import static android.support.test.espresso.action.ViewActions.typeText;
-import static android.support.test.espresso.assertion.ViewAssertions.matches;
-import static android.support.test.espresso.intent.Intents.intended;
-import static android.support.test.espresso.intent.matcher.IntentMatchers.hasComponent;
-import static android.support.test.espresso.matcher.ViewMatchers.isDisplayed;
-import static android.support.test.espresso.matcher.ViewMatchers.isRoot;
-import static android.support.test.espresso.matcher.ViewMatchers.withId;
-import static android.support.test.espresso.matcher.ViewMatchers.withText;
-import static android.support.test.runner.lifecycle.Stage.PAUSED;
+import androidx.test.espresso.intent.rule.IntentsTestRule;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.uiautomator.UiDevice;
+import androidx.test.uiautomator.UiObject;
+import androidx.test.uiautomator.UiSelector;
+
+import static androidx.test.core.app.ApplicationProvider.getApplicationContext;
+import static androidx.test.espresso.Espresso.onView;
+import static androidx.test.espresso.action.ViewActions.click;
+import static androidx.test.espresso.action.ViewActions.typeText;
+import static androidx.test.espresso.assertion.ViewAssertions.matches;
+import static androidx.test.espresso.matcher.ViewMatchers.isDisplayed;
+import static androidx.test.espresso.matcher.ViewMatchers.withId;
+import static androidx.test.espresso.matcher.ViewMatchers.withText;
+import static androidx.test.platform.app.InstrumentationRegistry.getInstrumentation;
 import static org.briarproject.bramble.api.plugin.LanTcpConstants.ID;
-import static org.briarproject.briar.android.ViewActions.waitForActivity;
 import static org.briarproject.briar.android.ViewActions.waitUntilMatches;
 import static org.briarproject.briar.android.util.UiUtils.needsDozeWhitelisting;
 import static org.junit.Assert.assertTrue;
@@ -82,7 +77,7 @@ public class SetupDataTest extends ScreenshotTest {
 				.perform(click());
 
 		// White-list Doze if needed
-		if (needsDozeWhitelisting(getTargetContext())) {
+		if (needsDozeWhitelisting(getApplicationContext())) {
 			onView(withText(R.string.setup_doze_button))
 					.check(matches(isDisplayed()))
 					.perform(click());
@@ -96,14 +91,8 @@ public class SetupDataTest extends ScreenshotTest {
 					.perform(click());
 		}
 
-		// wait for OpenDatabaseActivity to show up
-		onView(isRoot())
-				.perform(waitForActivity(testRule.getActivity(), PAUSED));
-		intended(hasComponent(OpenDatabaseActivity.class.getName()));
-
-		assertTrue(accountManager.hasDatabaseKey());
-
 		lifecycleManager.waitForStartup();
+		assertTrue(accountManager.hasDatabaseKey());
 		createTestData();
 
 		// close expiry warning
@@ -118,31 +107,18 @@ public class SetupDataTest extends ScreenshotTest {
 	private void createTestData() {
 		try {
 			createTestDataExceptions();
-		} catch (DbException | FormatException e) {
+		} catch (DbException e) {
 			throw new AssertionError(e);
 		}
 	}
 
 	private void createTestDataExceptions()
-			throws DbException, FormatException {
-		String bobName =
-				getTargetContext().getString(R.string.screenshot_bob);
+			throws DbException {
+		Context ctx = getApplicationContext();
+		String bobName = ctx.getString(R.string.screenshot_bob);
 		Contact bob = testDataCreator.addContact(bobName);
 
-		String bobHi = getTargetContext()
-				.getString(R.string.screenshot_message_1);
-		long bobTime = getMinutesAgo(2);
-		testDataCreator.addPrivateMessage(bob, bobHi, bobTime, true);
-
-		String aliceHi = getTargetContext()
-				.getString(R.string.screenshot_message_2);
-		long aliceTime = getMinutesAgo(1);
-		testDataCreator.addPrivateMessage(bob, aliceHi, aliceTime, false);
-
-		String bobHi2 = getTargetContext()
-				.getString(R.string.screenshot_message_3);
-		long bobTime2 = getMinutesAgo(0);
-		testDataCreator.addPrivateMessage(bob, bobHi2, bobTime2, true);
+		// TODO add messages
 
 		connectionRegistry.registerConnection(bob.getId(), ID, true);
 	}
diff --git a/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/conversation/ConversationActivityScreenshotTest.java b/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/conversation/ConversationActivityScreenshotTest.java
index e25951c33..81b8655ea 100644
--- a/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/conversation/ConversationActivityScreenshotTest.java
+++ b/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/conversation/ConversationActivityScreenshotTest.java
@@ -1,25 +1,19 @@
-package org.briarproject.briar.android.contact;
+package org.briarproject.briar.android.conversation;
 
 import android.content.Context;
 import android.content.Intent;
-import android.support.test.rule.ActivityTestRule;
-import android.support.test.runner.AndroidJUnit4;
 
-import org.briarproject.briar.R;
 import org.briarproject.briar.android.BriarUiTestComponent;
 import org.briarproject.briar.android.ScreenshotTest;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import static android.support.test.InstrumentationRegistry.getInstrumentation;
-import static android.support.test.espresso.Espresso.onView;
-import static android.support.test.espresso.matcher.ViewMatchers.isCompletelyDisplayed;
-import static android.support.test.espresso.matcher.ViewMatchers.withId;
-import static android.support.test.espresso.matcher.ViewMatchers.withText;
-import static org.briarproject.briar.android.ViewActions.waitUntilMatches;
-import static org.briarproject.briar.android.contact.ConversationActivity.CONTACT_ID;
-import static org.hamcrest.Matchers.allOf;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.rule.ActivityTestRule;
+
+import static androidx.test.core.app.ApplicationProvider.getApplicationContext;
+import static org.briarproject.briar.android.conversation.ConversationActivity.CONTACT_ID;
 
 @RunWith(AndroidJUnit4.class)
 public class ConversationActivityScreenshotTest extends ScreenshotTest {
@@ -34,17 +28,13 @@ public class ConversationActivityScreenshotTest extends ScreenshotTest {
 	}
 
 	@Test
-	public void messaging() throws Exception {
-		Context targetContext = getInstrumentation().getTargetContext();
+	public void messaging() {
+		Context targetContext = getApplicationContext();
 		Intent intent = new Intent(targetContext, ConversationActivity.class);
 		intent.putExtra(CONTACT_ID, 1);
 		testRule.launchActivity(intent);
 
-		onView(withId(R.id.conversationView))
-				.perform(waitUntilMatches(allOf(
-						withText(R.string.screenshot_message_3),
-						isCompletelyDisplayed())
-				));
+		// TODO add test data and wait for it do appear
 
 		screenshot("manual_messaging", testRule.getActivity());
 	}
diff --git a/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/settings/SettingsActivityScreenshotTest.java b/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/settings/SettingsActivityScreenshotTest.java
index ceb1817f6..2d11280ce 100644
--- a/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/settings/SettingsActivityScreenshotTest.java
+++ b/briar-android/src/androidTestScreenshot/java/org/briarproject/briar/android/settings/SettingsActivityScreenshotTest.java
@@ -1,10 +1,6 @@
 package org.briarproject.briar.android.settings;
 
 import android.content.Intent;
-import android.support.test.espresso.contrib.DrawerActions;
-import android.support.test.rule.ActivityTestRule;
-import android.support.test.runner.AndroidJUnit4;
-import android.support.v7.widget.RecyclerView;
 import android.view.Gravity;
 
 import org.briarproject.briar.R;
@@ -15,18 +11,23 @@ import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import static android.support.test.espresso.Espresso.onView;
-import static android.support.test.espresso.action.ViewActions.click;
-import static android.support.test.espresso.assertion.ViewAssertions.matches;
-import static android.support.test.espresso.contrib.DrawerMatchers.isClosed;
-import static android.support.test.espresso.contrib.RecyclerViewActions.scrollTo;
-import static android.support.test.espresso.matcher.ViewMatchers.hasDescendant;
-import static android.support.test.espresso.matcher.ViewMatchers.isDisplayed;
-import static android.support.test.espresso.matcher.ViewMatchers.isEnabled;
-import static android.support.test.espresso.matcher.ViewMatchers.withChild;
-import static android.support.test.espresso.matcher.ViewMatchers.withClassName;
-import static android.support.test.espresso.matcher.ViewMatchers.withId;
-import static android.support.test.espresso.matcher.ViewMatchers.withText;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.test.espresso.contrib.DrawerActions;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.rule.ActivityTestRule;
+
+import static androidx.test.espresso.Espresso.onView;
+import static androidx.test.espresso.action.ViewActions.click;
+import static androidx.test.espresso.assertion.ViewAssertions.matches;
+import static androidx.test.espresso.contrib.DrawerMatchers.isClosed;
+import static androidx.test.espresso.contrib.RecyclerViewActions.scrollTo;
+import static androidx.test.espresso.matcher.ViewMatchers.hasDescendant;
+import static androidx.test.espresso.matcher.ViewMatchers.isDisplayed;
+import static androidx.test.espresso.matcher.ViewMatchers.isEnabled;
+import static androidx.test.espresso.matcher.ViewMatchers.withChild;
+import static androidx.test.espresso.matcher.ViewMatchers.withClassName;
+import static androidx.test.espresso.matcher.ViewMatchers.withId;
+import static androidx.test.espresso.matcher.ViewMatchers.withText;
 import static org.briarproject.briar.android.ViewActions.waitUntilMatches;
 import static org.hamcrest.CoreMatchers.is;
 
diff --git a/briar-android/src/main/java/im/delight/android/identicons/Identicon.java b/briar-android/src/main/java/im/delight/android/identicons/Identicon.java
index 42f5c9591..ea1a5fce8 100644
--- a/briar-android/src/main/java/im/delight/android/identicons/Identicon.java
+++ b/briar-android/src/main/java/im/delight/android/identicons/Identicon.java
@@ -19,8 +19,9 @@ package im.delight.android.identicons;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Paint;
-import android.support.annotation.NonNull;
-import android.support.annotation.UiThread;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.UiThread;
 
 import static android.graphics.Paint.Style.FILL;
 
diff --git a/briar-android/src/main/java/im/delight/android/identicons/IdenticonDrawable.java b/briar-android/src/main/java/im/delight/android/identicons/IdenticonDrawable.java
index 75663bd29..2e5513cce 100644
--- a/briar-android/src/main/java/im/delight/android/identicons/IdenticonDrawable.java
+++ b/briar-android/src/main/java/im/delight/android/identicons/IdenticonDrawable.java
@@ -20,8 +20,9 @@ import android.graphics.Canvas;
 import android.graphics.ColorFilter;
 import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
-import android.support.annotation.NonNull;
-import android.support.annotation.UiThread;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.UiThread;
 
 import static android.graphics.PixelFormat.OPAQUE;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/AndroidComponent.java b/briar-android/src/main/java/org/briarproject/briar/android/AndroidComponent.java
index 8fd44813c..987984985 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/AndroidComponent.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/AndroidComponent.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android;
 
-import android.arch.lifecycle.ViewModelProvider;
-
 import org.briarproject.bramble.BrambleAndroidEagerSingletons;
 import org.briarproject.bramble.BrambleAndroidModule;
 import org.briarproject.bramble.BrambleCoreEagerSingletons;
@@ -61,6 +59,7 @@ import java.util.concurrent.Executor;
 
 import javax.inject.Singleton;
 
+import androidx.lifecycle.ViewModelProvider;
 import dagger.Component;
 
 @Singleton
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/AndroidNotificationManagerImpl.java b/briar-android/src/main/java/org/briarproject/briar/android/AndroidNotificationManagerImpl.java
index 10b895170..e4d1f3190 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/AndroidNotificationManagerImpl.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/AndroidNotificationManagerImpl.java
@@ -9,11 +9,6 @@ import android.app.PendingIntent;
 import android.content.Context;
 import android.content.Intent;
 import android.net.Uri;
-import android.support.annotation.Nullable;
-import android.support.annotation.StringRes;
-import android.support.annotation.UiThread;
-import android.support.v4.app.NotificationCompat;
-import android.support.v4.app.TaskStackBuilder;
 
 import org.briarproject.bramble.api.Multiset;
 import org.briarproject.bramble.api.contact.ContactId;
@@ -56,6 +51,12 @@ import java.util.concurrent.atomic.AtomicBoolean;
 import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+import androidx.annotation.StringRes;
+import androidx.annotation.UiThread;
+import androidx.core.app.NotificationCompat;
+import androidx.core.app.TaskStackBuilder;
+
 import static android.app.Notification.DEFAULT_LIGHTS;
 import static android.app.Notification.DEFAULT_SOUND;
 import static android.app.Notification.DEFAULT_VIBRATE;
@@ -65,13 +66,13 @@ import static android.content.Context.NOTIFICATION_SERVICE;
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
 import static android.os.Build.VERSION.SDK_INT;
-import static android.support.v4.app.NotificationCompat.CATEGORY_MESSAGE;
-import static android.support.v4.app.NotificationCompat.CATEGORY_SERVICE;
-import static android.support.v4.app.NotificationCompat.CATEGORY_SOCIAL;
-import static android.support.v4.app.NotificationCompat.PRIORITY_LOW;
-import static android.support.v4.app.NotificationCompat.PRIORITY_MIN;
-import static android.support.v4.app.NotificationCompat.VISIBILITY_SECRET;
-import static android.support.v4.content.ContextCompat.getColor;
+import static androidx.core.app.NotificationCompat.CATEGORY_MESSAGE;
+import static androidx.core.app.NotificationCompat.CATEGORY_SERVICE;
+import static androidx.core.app.NotificationCompat.CATEGORY_SOCIAL;
+import static androidx.core.app.NotificationCompat.PRIORITY_LOW;
+import static androidx.core.app.NotificationCompat.PRIORITY_MIN;
+import static androidx.core.app.NotificationCompat.VISIBILITY_SECRET;
+import static androidx.core.content.ContextCompat.getColor;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 import static org.briarproject.briar.android.conversation.ConversationActivity.CONTACT_ID;
 import static org.briarproject.briar.android.navdrawer.NavDrawerActivity.BLOG_URI;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/BriarService.java b/briar-android/src/main/java/org/briarproject/briar/android/BriarService.java
index 46a10c7ff..355df4b8a 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/BriarService.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/BriarService.java
@@ -13,7 +13,6 @@ import android.content.IntentFilter;
 import android.content.ServiceConnection;
 import android.os.Binder;
 import android.os.IBinder;
-import android.support.v4.app.NotificationCompat;
 
 import org.briarproject.bramble.api.account.AccountManager;
 import org.briarproject.bramble.api.crypto.SecretKey;
@@ -32,6 +31,8 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.core.app.NotificationCompat;
+
 import static android.app.NotificationManager.IMPORTANCE_DEFAULT;
 import static android.app.NotificationManager.IMPORTANCE_NONE;
 import static android.app.PendingIntent.FLAG_UPDATE_CURRENT;
@@ -42,7 +43,7 @@ import static android.content.Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS;
 import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
 import static android.content.Intent.FLAG_ACTIVITY_NO_ANIMATION;
 import static android.os.Build.VERSION.SDK_INT;
-import static android.support.v4.app.NotificationCompat.VISIBILITY_SECRET;
+import static androidx.core.app.NotificationCompat.VISIBILITY_SECRET;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.ALREADY_RUNNING;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/NotificationCleanupService.java b/briar-android/src/main/java/org/briarproject/briar/android/NotificationCleanupService.java
index 1d8ca912f..7055668a8 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/NotificationCleanupService.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/NotificationCleanupService.java
@@ -3,12 +3,13 @@ package org.briarproject.briar.android;
 import android.app.IntentService;
 import android.content.Intent;
 import android.net.Uri;
-import android.support.annotation.Nullable;
 
 import org.briarproject.briar.api.android.AndroidNotificationManager;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+
 import static org.briarproject.briar.android.navdrawer.NavDrawerActivity.BLOG_URI;
 import static org.briarproject.briar.android.navdrawer.NavDrawerActivity.CONTACT_ADDED_URI;
 import static org.briarproject.briar.android.navdrawer.NavDrawerActivity.CONTACT_URI;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/ScreenFilterMonitorImpl.java b/briar-android/src/main/java/org/briarproject/briar/android/ScreenFilterMonitorImpl.java
index ebad8c2ec..1cdbb126f 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/ScreenFilterMonitorImpl.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/ScreenFilterMonitorImpl.java
@@ -11,7 +11,6 @@ import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
 import android.content.pm.Signature;
-import android.support.annotation.UiThread;
 
 import org.briarproject.bramble.api.lifecycle.Service;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
@@ -36,6 +35,8 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.annotation.UiThread;
+
 import static android.Manifest.permission.SYSTEM_ALERT_WINDOW;
 import static android.content.Intent.ACTION_PACKAGE_ADDED;
 import static android.content.Intent.ACTION_PACKAGE_CHANGED;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/StartupFailureActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/StartupFailureActivity.java
index 481d00d45..d92a2b58d 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/StartupFailureActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/StartupFailureActivity.java
@@ -3,8 +3,6 @@ package org.briarproject.briar.android;
 import android.app.NotificationManager;
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
 
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
@@ -14,6 +12,9 @@ import org.briarproject.briar.android.activity.BaseActivity;
 import org.briarproject.briar.android.fragment.BaseFragment.BaseFragmentListener;
 import org.briarproject.briar.android.fragment.ErrorFragment;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
 import static java.util.Objects.requireNonNull;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult;
 import static org.briarproject.briar.android.BriarService.EXTRA_NOTIFICATION_ID;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/account/AuthorNameFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/account/AuthorNameFragment.java
index de1952838..1df351d55 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/account/AuthorNameFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/account/AuthorNameFragment.java
@@ -1,14 +1,15 @@
 package org.briarproject.briar.android.account;
 
 import android.os.Bundle;
-import android.support.design.widget.TextInputEditText;
-import android.support.design.widget.TextInputLayout;
 import android.text.Editable;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
 
+import com.google.android.material.textfield.TextInputEditText;
+import com.google.android.material.textfield.TextInputLayout;
+
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/account/DozeFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/account/DozeFragment.java
index ba8eaaf90..454b8bd3a 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/account/DozeFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/account/DozeFragment.java
@@ -3,7 +3,6 @@ package org.briarproject.briar.android.account;
 import android.annotation.SuppressLint;
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -17,6 +16,8 @@ import org.briarproject.briar.android.account.PowerView.OnCheckedChangedListener
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.util.UiUtils;
 
+import androidx.annotation.Nullable;
+
 import static android.view.View.INVISIBLE;
 import static android.view.View.VISIBLE;
 import static java.util.Objects.requireNonNull;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/account/DozeView.java b/briar-android/src/main/java/org/briarproject/briar/android/account/DozeView.java
index e02f4f2e5..c036f657b 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/account/DozeView.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/account/DozeView.java
@@ -2,13 +2,14 @@ package org.briarproject.briar.android.account;
 
 
 import android.content.Context;
-import android.support.annotation.Nullable;
-import android.support.annotation.UiThread;
 import android.util.AttributeSet;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 
+import androidx.annotation.Nullable;
+import androidx.annotation.UiThread;
+
 import static org.briarproject.briar.android.util.UiUtils.needsDozeWhitelisting;
 
 @UiThread
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/account/HuaweiView.java b/briar-android/src/main/java/org/briarproject/briar/android/account/HuaweiView.java
index 2396aab25..54b4f4831 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/account/HuaweiView.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/account/HuaweiView.java
@@ -5,8 +5,6 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
-import android.support.annotation.StringRes;
-import android.support.annotation.UiThread;
 import android.util.AttributeSet;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
@@ -16,6 +14,9 @@ import java.util.List;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.StringRes;
+import androidx.annotation.UiThread;
+
 import static android.os.Build.VERSION.SDK_INT;
 
 @UiThread
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/account/LockManagerImpl.java b/briar-android/src/main/java/org/briarproject/briar/android/account/LockManagerImpl.java
index 17c821997..0d4edd6d2 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/account/LockManagerImpl.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/account/LockManagerImpl.java
@@ -3,11 +3,8 @@ package org.briarproject.briar.android.account;
 import android.app.AlarmManager;
 import android.app.Application;
 import android.app.PendingIntent;
-import android.arch.lifecycle.LiveData;
-import android.arch.lifecycle.MutableLiveData;
 import android.content.Context;
 import android.content.Intent;
-import android.support.annotation.UiThread;
 
 import org.briarproject.bramble.api.db.DatabaseExecutor;
 import org.briarproject.bramble.api.db.DbException;
@@ -30,6 +27,10 @@ import java.util.logging.Logger;
 import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
 
+import androidx.annotation.UiThread;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+
 import static android.app.AlarmManager.ELAPSED_REALTIME;
 import static android.app.PendingIntent.getService;
 import static android.content.Context.ALARM_SERVICE;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/account/PowerView.java b/briar-android/src/main/java/org/briarproject/briar/android/account/PowerView.java
index 032826ca5..4fd4d167c 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/account/PowerView.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/account/PowerView.java
@@ -3,10 +3,6 @@ package org.briarproject.briar.android.account;
 import android.content.Context;
 import android.os.Parcel;
 import android.os.Parcelable;
-import android.support.annotation.Nullable;
-import android.support.annotation.StringRes;
-import android.support.annotation.UiThread;
-import android.support.constraint.ConstraintLayout;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -18,6 +14,11 @@ import android.widget.TextView;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 
+import androidx.annotation.Nullable;
+import androidx.annotation.StringRes;
+import androidx.annotation.UiThread;
+import androidx.constraintlayout.widget.ConstraintLayout;
+
 import static android.content.Context.LAYOUT_INFLATER_SERVICE;
 import static org.briarproject.briar.android.util.UiUtils.showOnboardingDialog;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/account/SetPasswordFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/account/SetPasswordFragment.java
index 9895530d1..854971c4e 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/account/SetPasswordFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/account/SetPasswordFragment.java
@@ -2,8 +2,6 @@ package org.briarproject.briar.android.account;
 
 import android.os.Bundle;
 import android.os.IBinder;
-import android.support.design.widget.TextInputEditText;
-import android.support.design.widget.TextInputLayout;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -11,6 +9,9 @@ import android.view.inputmethod.InputMethodManager;
 import android.widget.Button;
 import android.widget.ProgressBar;
 
+import com.google.android.material.textfield.TextInputEditText;
+import com.google.android.material.textfield.TextInputLayout;
+
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/account/SetupControllerImpl.java b/briar-android/src/main/java/org/briarproject/briar/android/account/SetupControllerImpl.java
index 89f88f622..0b814420d 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/account/SetupControllerImpl.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/account/SetupControllerImpl.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.account;
 
-import android.support.annotation.Nullable;
-
 import org.briarproject.bramble.api.account.AccountManager;
 import org.briarproject.bramble.api.crypto.PasswordStrengthEstimator;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
@@ -14,6 +12,8 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+
 @NotNullByDefault
 public class SetupControllerImpl implements SetupController {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/account/SetupFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/account/SetupFragment.java
index acbcc8252..bf7215fe6 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/account/SetupFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/account/SetupFragment.java
@@ -1,6 +1,5 @@
 package org.briarproject.briar.android.account;
 
-import android.support.annotation.Nullable;
 import android.text.Editable;
 import android.text.TextWatcher;
 import android.view.KeyEvent;
@@ -18,6 +17,8 @@ import org.briarproject.briar.android.fragment.BaseFragment;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+
 import static android.view.inputmethod.EditorInfo.IME_ACTION_DONE;
 import static android.view.inputmethod.EditorInfo.IME_ACTION_NEXT;
 import static org.briarproject.briar.android.util.UiUtils.enterPressed;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/account/UnlockActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/account/UnlockActivity.java
index cbbcf3d09..807a2396f 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/account/UnlockActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/account/UnlockActivity.java
@@ -8,8 +8,6 @@ import android.hardware.biometrics.BiometricPrompt.AuthenticationResult;
 import android.hardware.biometrics.BiometricPrompt.Builder;
 import android.os.Bundle;
 import android.os.CancellationSignal;
-import android.support.annotation.Nullable;
-import android.support.annotation.RequiresApi;
 import android.widget.Toast;
 
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
@@ -23,6 +21,9 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
+
 import static android.hardware.biometrics.BiometricPrompt.BIOMETRIC_ERROR_CANCELED;
 import static android.hardware.biometrics.BiometricPrompt.BIOMETRIC_ERROR_USER_CANCELED;
 import static android.os.Build.VERSION.SDK_INT;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/activity/ActivityComponent.java b/briar-android/src/main/java/org/briarproject/briar/android/activity/ActivityComponent.java
index 0f13d0900..60edec57d 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/activity/ActivityComponent.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/activity/ActivityComponent.java
@@ -20,10 +20,10 @@ import org.briarproject.briar.android.blog.ReblogFragment;
 import org.briarproject.briar.android.blog.RssFeedImportActivity;
 import org.briarproject.briar.android.blog.RssFeedManageActivity;
 import org.briarproject.briar.android.blog.WriteBlogPostActivity;
-import org.briarproject.briar.android.contact.add.remote.AddContactActivity;
-import org.briarproject.briar.android.contact.add.remote.LinkExchangeFragment;
 import org.briarproject.briar.android.contact.ContactListFragment;
 import org.briarproject.briar.android.contact.ContactModule;
+import org.briarproject.briar.android.contact.add.remote.AddContactActivity;
+import org.briarproject.briar.android.contact.add.remote.LinkExchangeFragment;
 import org.briarproject.briar.android.contact.add.remote.NicknameFragment;
 import org.briarproject.briar.android.contact.add.remote.PendingContactListActivity;
 import org.briarproject.briar.android.conversation.AliasDialogFragment;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/activity/ActivityModule.java b/briar-android/src/main/java/org/briarproject/briar/android/activity/ActivityModule.java
index 52b8582f4..1986eb1af 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/activity/ActivityModule.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/activity/ActivityModule.java
@@ -2,14 +2,14 @@ package org.briarproject.briar.android.activity;
 
 import android.app.Activity;
 
+import org.briarproject.briar.android.account.SetupController;
+import org.briarproject.briar.android.account.SetupControllerImpl;
 import org.briarproject.briar.android.controller.BriarController;
 import org.briarproject.briar.android.controller.BriarControllerImpl;
 import org.briarproject.briar.android.controller.DbController;
 import org.briarproject.briar.android.controller.DbControllerImpl;
 import org.briarproject.briar.android.login.ChangePasswordController;
 import org.briarproject.briar.android.login.ChangePasswordControllerImpl;
-import org.briarproject.briar.android.account.SetupController;
-import org.briarproject.briar.android.account.SetupControllerImpl;
 import org.briarproject.briar.android.navdrawer.NavDrawerController;
 import org.briarproject.briar.android.navdrawer.NavDrawerControllerImpl;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/activity/BaseActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/activity/BaseActivity.java
index b56385c86..49a4ccb56 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/activity/BaseActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/activity/BaseActivity.java
@@ -2,12 +2,6 @@ package org.briarproject.briar.android.activity;
 
 import android.content.Context;
 import android.os.Bundle;
-import android.support.annotation.LayoutRes;
-import android.support.annotation.UiThread;
-import android.support.v4.app.Fragment;
-import android.support.v4.app.FragmentManager;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.Toolbar;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.ViewGroup.LayoutParams;
@@ -39,9 +33,16 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
-import static android.arch.lifecycle.Lifecycle.State.STARTED;
+import androidx.annotation.LayoutRes;
+import androidx.annotation.UiThread;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.widget.Toolbar;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+
 import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
 import static android.view.WindowManager.LayoutParams.FLAG_SECURE;
+import static androidx.lifecycle.Lifecycle.State.STARTED;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.briar.android.TestingConstants.PREVENT_SCREENSHOTS;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/activity/BriarActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/activity/BriarActivity.java
index 8d0019acc..95d18184c 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/activity/BriarActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/activity/BriarActivity.java
@@ -1,10 +1,6 @@
 package org.briarproject.briar.android.activity;
 
 import android.content.Intent;
-import android.support.annotation.RequiresApi;
-import android.support.v7.app.ActionBar;
-import android.support.v7.app.AlertDialog;
-import android.support.v7.widget.Toolbar;
 import android.transition.Transition;
 import android.view.Window;
 import android.widget.CheckBox;
@@ -25,6 +21,11 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.annotation.RequiresApi;
+import androidx.appcompat.app.ActionBar;
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.widget.Toolbar;
+
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TASK;
 import static android.content.Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS;
 import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentCreationTask.java b/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentCreationTask.java
index 8c55972a9..cdeea6c5d 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentCreationTask.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentCreationTask.java
@@ -4,7 +4,6 @@ import android.content.ContentResolver;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory.Options;
 import android.net.Uri;
-import android.support.annotation.Nullable;
 
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
@@ -22,6 +21,8 @@ import java.io.InputStream;
 import java.util.Collection;
 import java.util.logging.Logger;
 
+import androidx.annotation.Nullable;
+
 import static android.graphics.Bitmap.CompressFormat.JPEG;
 import static android.graphics.BitmapFactory.decodeStream;
 import static java.util.logging.Level.INFO;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentCreator.java b/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentCreator.java
index 05916b20c..c8d9d617e 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentCreator.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentCreator.java
@@ -1,8 +1,6 @@
 package org.briarproject.briar.android.attachment;
 
-import android.arch.lifecycle.LiveData;
 import android.net.Uri;
-import android.support.annotation.UiThread;
 
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
@@ -13,6 +11,9 @@ import org.briarproject.briar.api.messaging.AttachmentHeader;
 import java.util.Collection;
 import java.util.List;
 
+import androidx.annotation.UiThread;
+import androidx.lifecycle.LiveData;
+
 @NotNullByDefault
 public interface AttachmentCreator {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentCreatorImpl.java b/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentCreatorImpl.java
index 53687f48b..882ef569f 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentCreatorImpl.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentCreatorImpl.java
@@ -2,11 +2,7 @@ package org.briarproject.briar.android.attachment;
 
 
 import android.app.Application;
-import android.arch.lifecycle.LiveData;
-import android.arch.lifecycle.MutableLiveData;
 import android.net.Uri;
-import android.support.annotation.Nullable;
-import android.support.annotation.UiThread;
 
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
@@ -30,6 +26,11 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+import androidx.annotation.UiThread;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.logException;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentDimensions.java b/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentDimensions.java
index 1fda39393..36e83644a 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentDimensions.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentDimensions.java
@@ -1,13 +1,14 @@
 package org.briarproject.briar.android.attachment;
 
 import android.content.res.Resources;
-import android.support.annotation.VisibleForTesting;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 
 import javax.annotation.concurrent.Immutable;
 
+import androidx.annotation.VisibleForTesting;
+
 @Immutable
 @NotNullByDefault
 class AttachmentDimensions {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentItem.java b/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentItem.java
index 43410db0f..a72c31948 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentItem.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentItem.java
@@ -2,7 +2,6 @@ package org.briarproject.briar.android.attachment;
 
 import android.os.Parcel;
 import android.os.Parcelable;
-import android.support.annotation.Nullable;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.MessageId;
@@ -12,6 +11,8 @@ import java.util.concurrent.atomic.AtomicLong;
 
 import javax.annotation.concurrent.Immutable;
 
+import androidx.annotation.Nullable;
+
 import static java.util.Objects.requireNonNull;
 
 @Immutable
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentManager.java b/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentManager.java
index 208d1de71..db7f0e850 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentManager.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentManager.java
@@ -1,8 +1,6 @@
 package org.briarproject.briar.android.attachment;
 
-import android.arch.lifecycle.LiveData;
 import android.net.Uri;
-import android.support.annotation.UiThread;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.api.messaging.AttachmentHeader;
@@ -10,6 +8,9 @@ import org.briarproject.briar.api.messaging.AttachmentHeader;
 import java.util.Collection;
 import java.util.List;
 
+import androidx.annotation.UiThread;
+import androidx.lifecycle.LiveData;
+
 @UiThread
 @NotNullByDefault
 public interface AttachmentManager {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentRetriever.java b/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentRetriever.java
index 93bbcfba3..33d709ab7 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentRetriever.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentRetriever.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.attachment;
 
-import android.support.annotation.Nullable;
-
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.MessageId;
@@ -11,6 +9,8 @@ import org.briarproject.briar.api.messaging.AttachmentHeader;
 import java.io.InputStream;
 import java.util.List;
 
+import androidx.annotation.Nullable;
+
 @NotNullByDefault
 public interface AttachmentRetriever {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentRetrieverImpl.java b/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentRetrieverImpl.java
index 2bef6e519..53a376aea 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentRetrieverImpl.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/attachment/AttachmentRetrieverImpl.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.attachment;
 
-import android.support.annotation.Nullable;
-
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.MessageId;
@@ -18,6 +16,8 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/attachment/ImageHelper.java b/briar-android/src/main/java/org/briarproject/briar/android/attachment/ImageHelper.java
index e1ea0776d..eb16cbe01 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/attachment/ImageHelper.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/attachment/ImageHelper.java
@@ -1,11 +1,11 @@
 package org.briarproject.briar.android.attachment;
 
-import android.support.annotation.Nullable;
-
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
 import java.io.InputStream;
 
+import androidx.annotation.Nullable;
+
 @NotNullByDefault
 public interface ImageHelper {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/attachment/ImageHelperImpl.java b/briar-android/src/main/java/org/briarproject/briar/android/attachment/ImageHelperImpl.java
index 86a2ed39a..f7f2435eb 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/attachment/ImageHelperImpl.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/attachment/ImageHelperImpl.java
@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.attachment;
 
 import android.graphics.BitmapFactory;
-import android.support.annotation.Nullable;
 import android.webkit.MimeTypeMap;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
@@ -11,6 +10,8 @@ import java.io.InputStream;
 import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+
 @Immutable
 @NotNullByDefault
 class ImageHelperImpl implements ImageHelper {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/attachment/ImageSizeCalculator.java b/briar-android/src/main/java/org/briarproject/briar/android/attachment/ImageSizeCalculator.java
index 41b3094cb..daccea2f5 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/attachment/ImageSizeCalculator.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/attachment/ImageSizeCalculator.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.attachment;
 
-import android.support.media.ExifInterface;
-
 import com.bumptech.glide.util.MarkEnforcingInputStream;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
@@ -11,13 +9,15 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.util.logging.Logger;
 
-import static android.support.media.ExifInterface.ORIENTATION_ROTATE_270;
-import static android.support.media.ExifInterface.ORIENTATION_ROTATE_90;
-import static android.support.media.ExifInterface.ORIENTATION_TRANSPOSE;
-import static android.support.media.ExifInterface.ORIENTATION_TRANSVERSE;
-import static android.support.media.ExifInterface.TAG_IMAGE_LENGTH;
-import static android.support.media.ExifInterface.TAG_IMAGE_WIDTH;
-import static android.support.media.ExifInterface.TAG_ORIENTATION;
+import androidx.exifinterface.media.ExifInterface;
+
+import static androidx.exifinterface.media.ExifInterface.ORIENTATION_ROTATE_270;
+import static androidx.exifinterface.media.ExifInterface.ORIENTATION_ROTATE_90;
+import static androidx.exifinterface.media.ExifInterface.ORIENTATION_TRANSPOSE;
+import static androidx.exifinterface.media.ExifInterface.ORIENTATION_TRANSVERSE;
+import static androidx.exifinterface.media.ExifInterface.TAG_IMAGE_LENGTH;
+import static androidx.exifinterface.media.ExifInterface.TAG_IMAGE_WIDTH;
+import static androidx.exifinterface.media.ExifInterface.TAG_ORIENTATION;
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.logException;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/blog/BaseController.java b/briar-android/src/main/java/org/briarproject/briar/android/blog/BaseController.java
index a0199b2ef..d204c7f21 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/blog/BaseController.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/blog/BaseController.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.blog;
 
-import android.support.annotation.UiThread;
-
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
@@ -14,6 +12,8 @@ import java.util.Collection;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.UiThread;
+
 @NotNullByDefault
 interface BaseController {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/blog/BaseControllerImpl.java b/briar-android/src/main/java/org/briarproject/briar/android/blog/BaseControllerImpl.java
index f6fb46c9b..a287df57f 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/blog/BaseControllerImpl.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/blog/BaseControllerImpl.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.blog;
 
-import android.support.annotation.CallSuper;
-
 import org.briarproject.bramble.api.db.DatabaseExecutor;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.event.EventBus;
@@ -32,6 +30,8 @@ import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.CallSuper;
+
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
 import static org.briarproject.bramble.util.LogUtils.logException;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/blog/BasePostFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/blog/BasePostFragment.java
index dcfc63334..35d0ea653 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/blog/BasePostFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/blog/BasePostFragment.java
@@ -4,8 +4,6 @@ import android.content.Intent;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Looper;
-import android.support.annotation.CallSuper;
-import android.support.annotation.UiThread;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -21,6 +19,9 @@ import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.CallSuper;
+import androidx.annotation.UiThread;
+
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 import static android.view.View.INVISIBLE;
 import static android.view.View.VISIBLE;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogActivity.java
index 2d3c9b397..23a7ff252 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogActivity.java
@@ -2,7 +2,6 @@ package org.briarproject.briar.android.blog;
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.v7.widget.Toolbar;
 
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
@@ -16,6 +15,8 @@ import org.briarproject.briar.android.sharing.BlogSharingStatusActivity;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.appcompat.widget.Toolbar;
+
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 public class BlogActivity extends BriarActivity
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogController.java b/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogController.java
index e2c9cefd1..6c36fc4e6 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogController.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogController.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.blog;
 
-import android.support.annotation.UiThread;
-
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
@@ -11,6 +9,8 @@ import org.briarproject.briar.android.controller.handler.ResultExceptionHandler;
 
 import java.util.Collection;
 
+import androidx.annotation.UiThread;
+
 @NotNullByDefault
 public interface BlogController extends BaseController {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogFragment.java
index 4e0eaf759..0f933e25e 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogFragment.java
@@ -4,11 +4,6 @@ import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.Bundle;
 import android.os.Parcelable;
-import android.support.annotation.UiThread;
-import android.support.v7.app.ActionBar;
-import android.support.v7.app.AlertDialog;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.RecyclerView.LayoutManager;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -41,10 +36,16 @@ import java.util.Collection;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.annotation.UiThread;
+import androidx.appcompat.app.ActionBar;
+import androidx.appcompat.app.AlertDialog;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView.LayoutManager;
+
 import static android.app.Activity.RESULT_OK;
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
-import static android.support.design.widget.Snackbar.LENGTH_LONG;
 import static android.widget.Toast.LENGTH_SHORT;
+import static com.google.android.material.snackbar.Snackbar.LENGTH_LONG;
 import static java.util.Objects.requireNonNull;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_SHARE_BLOG;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogPostAdapter.java b/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogPostAdapter.java
index d7e5d1fef..edddb09c9 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogPostAdapter.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogPostAdapter.java
@@ -1,8 +1,6 @@
 package org.briarproject.briar.android.blog;
 
 import android.content.Context;
-import android.support.annotation.Nullable;
-import android.support.v4.app.FragmentManager;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -12,6 +10,9 @@ import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.util.BriarAdapter;
 
+import androidx.annotation.Nullable;
+import androidx.fragment.app.FragmentManager;
+
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 class BlogPostAdapter extends BriarAdapter<BlogPostItem, BlogPostViewHolder> {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogPostFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogPostFragment.java
index 1af4f55a0..ee37858a4 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogPostFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogPostFragment.java
@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.blog;
 
 import android.os.Bundle;
-import android.support.annotation.UiThread;
 
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
@@ -14,6 +13,8 @@ import org.briarproject.briar.api.blog.BlogPostHeader;
 
 import javax.inject.Inject;
 
+import androidx.annotation.UiThread;
+
 @UiThread
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogPostItem.java b/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogPostItem.java
index d64303c07..7f5ef0de5 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogPostItem.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogPostItem.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.blog;
 
-import android.support.annotation.NonNull;
-
 import org.briarproject.bramble.api.identity.Author;
 import org.briarproject.bramble.api.identity.AuthorInfo;
 import org.briarproject.bramble.api.sync.GroupId;
@@ -11,6 +9,8 @@ import org.briarproject.briar.api.blog.BlogPostHeader;
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.NotThreadSafe;
 
+import androidx.annotation.NonNull;
+
 @NotThreadSafe
 public class BlogPostItem implements Comparable<BlogPostItem> {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogPostViewHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogPostViewHolder.java
index 70ae123b3..e10af04b9 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogPostViewHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/blog/BlogPostViewHolder.java
@@ -2,11 +2,6 @@ package org.briarproject.briar.android.blog;
 
 import android.content.Context;
 import android.content.Intent;
-import android.support.annotation.NonNull;
-import android.support.annotation.UiThread;
-import android.support.v4.app.FragmentManager;
-import android.support.v4.view.ViewCompat;
-import android.support.v7.widget.RecyclerView;
 import android.text.Spanned;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -22,6 +17,12 @@ import org.briarproject.briar.api.blog.BlogPostHeader;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.UiThread;
+import androidx.core.view.ViewCompat;
+import androidx.fragment.app.FragmentManager;
+import androidx.recyclerview.widget.RecyclerView;
+
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/blog/FeedController.java b/briar-android/src/main/java/org/briarproject/briar/android/blog/FeedController.java
index ca6e1fefe..6a8cdd7cd 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/blog/FeedController.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/blog/FeedController.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.blog;
 
-import android.support.annotation.UiThread;
-
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.android.controller.handler.ResultExceptionHandler;
@@ -9,6 +7,8 @@ import org.briarproject.briar.api.blog.Blog;
 
 import java.util.Collection;
 
+import androidx.annotation.UiThread;
+
 @NotNullByDefault
 public interface FeedController extends BaseController {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/blog/FeedFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/blog/FeedFragment.java
index 2a47ae580..2896fded4 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/blog/FeedFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/blog/FeedFragment.java
@@ -3,8 +3,6 @@ package org.briarproject.briar.android.blog;
 import android.content.Intent;
 import android.os.Bundle;
 import android.os.Parcelable;
-import android.support.annotation.UiThread;
-import android.support.v7.widget.LinearLayoutManager;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -31,9 +29,12 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.annotation.UiThread;
+import androidx.recyclerview.widget.LinearLayoutManager;
+
 import static android.app.Activity.RESULT_OK;
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
-import static android.support.design.widget.Snackbar.LENGTH_LONG;
+import static com.google.android.material.snackbar.Snackbar.LENGTH_LONG;
 import static java.util.Objects.requireNonNull;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_WRITE_BLOG_POST;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/blog/FeedPostFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/blog/FeedPostFragment.java
index ca7ae3fe0..032445c0e 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/blog/FeedPostFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/blog/FeedPostFragment.java
@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.blog;
 
 import android.os.Bundle;
-import android.support.annotation.UiThread;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -17,6 +16,8 @@ import org.briarproject.briar.android.controller.handler.UiResultExceptionHandle
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.annotation.UiThread;
+
 import static java.util.Objects.requireNonNull;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/blog/RssFeedAdapter.java b/briar-android/src/main/java/org/briarproject/briar/android/blog/RssFeedAdapter.java
index b7548c043..7ec60e0b6 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/blog/RssFeedAdapter.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/blog/RssFeedAdapter.java
@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.blog;
 
 import android.content.Context;
-import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -13,6 +12,8 @@ import org.briarproject.briar.android.util.BriarAdapter;
 import org.briarproject.briar.android.util.UiUtils;
 import org.briarproject.briar.api.feed.Feed;
 
+import androidx.recyclerview.widget.RecyclerView;
+
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/blog/RssFeedImportActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/blog/RssFeedImportActivity.java
index 9b8db53ef..08ac68ace 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/blog/RssFeedImportActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/blog/RssFeedImportActivity.java
@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.blog;
 
 import android.os.Bundle;
-import android.support.v7.app.AlertDialog;
 import android.text.Editable;
 import android.text.TextWatcher;
 import android.util.Patterns;
@@ -27,6 +26,8 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.appcompat.app.AlertDialog;
+
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 import static android.view.inputmethod.EditorInfo.IME_ACTION_DONE;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/blog/RssFeedManageActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/blog/RssFeedManageActivity.java
index feaf88354..1c840f68e 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/blog/RssFeedManageActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/blog/RssFeedManageActivity.java
@@ -3,13 +3,12 @@ package org.briarproject.briar.android.blog;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.design.widget.Snackbar;
-import android.support.v7.app.AlertDialog;
-import android.support.v7.widget.LinearLayoutManager;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
 
+import com.google.android.material.snackbar.Snackbar;
+
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
@@ -24,8 +23,11 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
+import androidx.appcompat.app.AlertDialog;
+import androidx.recyclerview.widget.LinearLayoutManager;
+
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
-import static android.support.design.widget.Snackbar.LENGTH_LONG;
+import static com.google.android.material.snackbar.Snackbar.LENGTH_LONG;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/blog/WriteBlogPostActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/blog/WriteBlogPostActivity.java
index 6e535d263..6ac261ecf 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/blog/WriteBlogPostActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/blog/WriteBlogPostActivity.java
@@ -2,7 +2,6 @@ package org.briarproject.briar.android.blog;
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
 import android.view.MenuItem;
 import android.widget.ProgressBar;
 
@@ -31,6 +30,8 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 import static java.util.logging.Level.WARNING;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/contact/BaseContactListAdapter.java b/briar-android/src/main/java/org/briarproject/briar/android/contact/BaseContactListAdapter.java
index 779091d0c..2ddac95bc 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/contact/BaseContactListAdapter.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/contact/BaseContactListAdapter.java
@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.contact;
 
 import android.content.Context;
-import android.support.annotation.NonNull;
 import android.view.View;
 
 import org.briarproject.bramble.api.contact.ContactId;
@@ -9,7 +8,9 @@ import org.briarproject.briar.android.util.BriarAdapter;
 
 import javax.annotation.Nullable;
 
-import static android.support.v7.util.SortedList.INVALID_POSITION;
+import androidx.annotation.NonNull;
+
+import static androidx.recyclerview.widget.SortedList.INVALID_POSITION;
 import static org.briarproject.briar.android.util.UiUtils.getContactDisplayName;
 
 public abstract class BaseContactListAdapter<I extends ContactItem, VH extends ContactItemViewHolder<I>>
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/contact/ContactItemViewHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/contact/ContactItemViewHolder.java
index 403994d59..154287f47 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/contact/ContactItemViewHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/contact/ContactItemViewHolder.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.contact;
 
-import android.support.annotation.UiThread;
-import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageView;
@@ -14,6 +12,8 @@ import org.briarproject.briar.android.contact.BaseContactListAdapter.OnContactCl
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.UiThread;
+import androidx.recyclerview.widget.RecyclerView;
 import im.delight.android.identicons.IdenticonDrawable;
 
 import static org.briarproject.briar.android.util.UiUtils.getContactDisplayName;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/contact/ContactListFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/contact/ContactListFragment.java
index 3cc1ce505..ff7f89cf7 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/contact/ContactListFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/contact/ContactListFragment.java
@@ -2,18 +2,14 @@ package org.briarproject.briar.android.contact;
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.annotation.UiThread;
-import android.support.design.widget.FloatingActionButton;
-import android.support.design.widget.Snackbar;
-import android.support.v4.app.ActivityCompat;
-import android.support.v4.app.ActivityOptionsCompat;
-import android.support.v4.util.Pair;
-import android.support.v7.widget.LinearLayoutManager;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.TextView;
 
+import com.google.android.material.floatingactionbutton.FloatingActionButton;
+import com.google.android.material.snackbar.Snackbar;
+
 import org.briarproject.bramble.api.contact.Contact;
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.contact.ContactManager;
@@ -54,13 +50,18 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.annotation.UiThread;
+import androidx.core.app.ActivityCompat;
+import androidx.core.app.ActivityOptionsCompat;
+import androidx.core.util.Pair;
+import androidx.recyclerview.widget.LinearLayoutManager;
 import io.github.kobakei.materialfabspeeddial.FabSpeedDial;
 import io.github.kobakei.materialfabspeeddial.FabSpeedDial.OnMenuItemClickListener;
 
 import static android.os.Build.VERSION.SDK_INT;
-import static android.support.design.widget.Snackbar.LENGTH_INDEFINITE;
-import static android.support.v4.app.ActivityOptionsCompat.makeSceneTransitionAnimation;
-import static android.support.v4.view.ViewCompat.getTransitionName;
+import static androidx.core.app.ActivityOptionsCompat.makeSceneTransitionAnimation;
+import static androidx.core.view.ViewCompat.getTransitionName;
+import static com.google.android.material.snackbar.Snackbar.LENGTH_INDEFINITE;
 import static java.util.Objects.requireNonNull;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/contact/ContactListItemViewHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/contact/ContactListItemViewHolder.java
index 8194bfed7..9b109d66f 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/contact/ContactListItemViewHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/contact/ContactListItemViewHolder.java
@@ -1,6 +1,5 @@
 package org.briarproject.briar.android.contact;
 
-import android.support.annotation.UiThread;
 import android.view.View;
 import android.widget.TextView;
 
@@ -14,7 +13,9 @@ import java.util.Locale;
 
 import javax.annotation.Nullable;
 
-import static android.support.v4.view.ViewCompat.setTransitionName;
+import androidx.annotation.UiThread;
+
+import static androidx.core.view.ViewCompat.setTransitionName;
 import static org.briarproject.briar.android.util.UiUtils.formatDate;
 
 @UiThread
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/AddContactActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/AddContactActivity.java
index 191f95fc6..f93d0167a 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/AddContactActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/AddContactActivity.java
@@ -1,10 +1,7 @@
 package org.briarproject.briar.android.contact.add.remote;
 
-import android.arch.lifecycle.ViewModelProvider;
-import android.arch.lifecycle.ViewModelProviders;
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.v7.app.ActionBar;
 import android.view.MenuItem;
 import android.widget.Toast;
 
@@ -18,6 +15,10 @@ import org.briarproject.briar.android.fragment.BaseFragment.BaseFragmentListener
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.appcompat.app.ActionBar;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.lifecycle.ViewModelProviders;
+
 import static android.content.Intent.ACTION_SEND;
 import static android.content.Intent.ACTION_VIEW;
 import static android.content.Intent.EXTRA_TEXT;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/AddContactViewModel.java b/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/AddContactViewModel.java
index 4e3e48493..3e665d19f 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/AddContactViewModel.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/AddContactViewModel.java
@@ -1,10 +1,6 @@
 package org.briarproject.briar.android.contact.add.remote;
 
 import android.app.Application;
-import android.arch.lifecycle.AndroidViewModel;
-import android.arch.lifecycle.LiveData;
-import android.arch.lifecycle.MutableLiveData;
-import android.support.annotation.Nullable;
 
 import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.UnsupportedVersionException;
@@ -24,6 +20,11 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+import androidx.lifecycle.AndroidViewModel;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.api.contact.HandshakeLinkConstants.LINK_REGEX;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/LinkExchangeFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/LinkExchangeFragment.java
index 02b0e466b..2e4cad254 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/LinkExchangeFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/LinkExchangeFragment.java
@@ -1,14 +1,9 @@
 package org.briarproject.briar.android.contact.add.remote;
 
 import android.animation.ObjectAnimator;
-import android.arch.lifecycle.ViewModelProvider;
-import android.arch.lifecycle.ViewModelProviders;
 import android.content.ClipData;
 import android.content.ClipboardManager;
 import android.os.Bundle;
-import android.support.design.widget.TextInputEditText;
-import android.support.design.widget.TextInputLayout;
-import android.support.v4.app.ShareCompat.IntentBuilder;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -18,6 +13,9 @@ import android.widget.ScrollView;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import com.google.android.material.textfield.TextInputEditText;
+import com.google.android.material.textfield.TextInputLayout;
+
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
@@ -29,6 +27,10 @@ import java.util.regex.Matcher;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.core.app.ShareCompat.IntentBuilder;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.lifecycle.ViewModelProviders;
+
 import static android.content.Context.CLIPBOARD_SERVICE;
 import static android.widget.Toast.LENGTH_SHORT;
 import static java.util.Objects.requireNonNull;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/NicknameFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/NicknameFragment.java
index 7ab4c1632..634c45462 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/NicknameFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/NicknameFragment.java
@@ -1,16 +1,10 @@
 package org.briarproject.briar.android.contact.add.remote;
 
-import android.arch.lifecycle.ViewModelProvider;
-import android.arch.lifecycle.ViewModelProviders;
 import android.content.Context;
 import android.content.DialogInterface.OnClickListener;
 import android.content.Intent;
 import android.graphics.drawable.Drawable;
 import android.os.Bundle;
-import android.support.annotation.StringRes;
-import android.support.design.widget.TextInputEditText;
-import android.support.design.widget.TextInputLayout;
-import android.support.v7.app.AlertDialog.Builder;
 import android.text.Editable;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -19,6 +13,9 @@ import android.widget.Button;
 import android.widget.ProgressBar;
 import android.widget.Toast;
 
+import com.google.android.material.textfield.TextInputEditText;
+import com.google.android.material.textfield.TextInputLayout;
+
 import org.briarproject.bramble.api.UnsupportedVersionException;
 import org.briarproject.bramble.api.contact.PendingContact;
 import org.briarproject.bramble.api.db.ContactExistsException;
@@ -33,12 +30,17 @@ import org.briarproject.briar.android.fragment.BaseFragment;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
-import static android.support.v4.content.ContextCompat.getColor;
-import static android.support.v4.content.ContextCompat.getDrawable;
-import static android.support.v4.graphics.drawable.DrawableCompat.setTint;
+import androidx.annotation.StringRes;
+import androidx.appcompat.app.AlertDialog.Builder;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.lifecycle.ViewModelProviders;
+
 import static android.view.View.INVISIBLE;
 import static android.view.View.VISIBLE;
 import static android.widget.Toast.LENGTH_LONG;
+import static androidx.core.content.ContextCompat.getColor;
+import static androidx.core.content.ContextCompat.getDrawable;
+import static androidx.core.graphics.drawable.DrawableCompat.setTint;
 import static java.util.Objects.requireNonNull;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_AUTHOR_NAME_LENGTH;
 import static org.briarproject.bramble.util.StringUtils.utf8IsTooLong;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/PendingContactListActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/PendingContactListActivity.java
index bff1c8b36..225096dd9 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/PendingContactListActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/PendingContactListActivity.java
@@ -1,15 +1,11 @@
 package org.briarproject.briar.android.contact.add.remote;
 
-import android.arch.lifecycle.ViewModelProvider;
-import android.arch.lifecycle.ViewModelProviders;
 import android.content.DialogInterface.OnClickListener;
 import android.os.Bundle;
-import android.support.design.widget.Snackbar;
-import android.support.v7.app.ActionBar;
-import android.support.v7.app.AlertDialog;
-import android.support.v7.widget.LinearLayoutManager;
 import android.view.MenuItem;
 
+import com.google.android.material.snackbar.Snackbar;
+
 import org.briarproject.bramble.api.contact.PendingContactId;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
@@ -24,7 +20,13 @@ import java.util.Collection;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
-import static android.support.design.widget.Snackbar.LENGTH_INDEFINITE;
+import androidx.appcompat.app.ActionBar;
+import androidx.appcompat.app.AlertDialog;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.lifecycle.ViewModelProviders;
+import androidx.recyclerview.widget.LinearLayoutManager;
+
+import static com.google.android.material.snackbar.Snackbar.LENGTH_INDEFINITE;
 import static org.briarproject.bramble.api.contact.PendingContactState.FAILED;
 import static org.briarproject.briar.android.contact.add.remote.PendingContactItem.POLL_DURATION_MS;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/PendingContactListViewModel.java b/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/PendingContactListViewModel.java
index 291716187..c6a7d40cd 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/PendingContactListViewModel.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/PendingContactListViewModel.java
@@ -1,9 +1,6 @@
 package org.briarproject.briar.android.contact.add.remote;
 
 import android.app.Application;
-import android.arch.lifecycle.AndroidViewModel;
-import android.arch.lifecycle.LiveData;
-import android.arch.lifecycle.MutableLiveData;
 
 import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.contact.ContactManager;
@@ -29,6 +26,10 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
+import androidx.lifecycle.AndroidViewModel;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.api.contact.PendingContactState.OFFLINE;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/PendingContactViewHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/PendingContactViewHolder.java
index f1abd03f2..488e1d211 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/PendingContactViewHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/PendingContactViewHolder.java
@@ -1,8 +1,5 @@
 package org.briarproject.briar.android.contact.add.remote;
 
-import android.support.v4.content.ContextCompat;
-import android.support.v7.widget.AppCompatImageButton;
-import android.support.v7.widget.RecyclerView.ViewHolder;
 import android.view.View;
 import android.widget.TextView;
 
@@ -11,6 +8,10 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.view.TextAvatarView;
 
+import androidx.appcompat.widget.AppCompatImageButton;
+import androidx.core.content.ContextCompat;
+import androidx.recyclerview.widget.RecyclerView.ViewHolder;
+
 import static org.briarproject.briar.android.util.UiUtils.formatDate;
 
 @NotNullByDefault
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/contactselection/BaseContactSelectorFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/contactselection/BaseContactSelectorFragment.java
index 00a96fec4..704bf984c 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/contactselection/BaseContactSelectorFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/contactselection/BaseContactSelectorFragment.java
@@ -2,8 +2,6 @@ package org.briarproject.briar.android.contactselection;
 
 import android.content.Context;
 import android.os.Bundle;
-import android.support.annotation.CallSuper;
-import android.support.v7.widget.LinearLayoutManager;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -25,6 +23,9 @@ import java.util.Collection;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.CallSuper;
+import androidx.recyclerview.widget.LinearLayoutManager;
+
 import static java.util.Objects.requireNonNull;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 import static org.briarproject.briar.android.contactselection.ContactSelectorActivity.CONTACTS;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/contactselection/BaseSelectableContactHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/contactselection/BaseSelectableContactHolder.java
index fd69f6c12..df10f082c 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/contactselection/BaseSelectableContactHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/contactselection/BaseSelectableContactHolder.java
@@ -1,6 +1,5 @@
 package org.briarproject.briar.android.contactselection;
 
-import android.support.annotation.UiThread;
 import android.view.View;
 import android.widget.CheckBox;
 import android.widget.TextView;
@@ -12,6 +11,8 @@ import org.briarproject.briar.android.contact.ContactItemViewHolder;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.UiThread;
+
 import static org.briarproject.briar.android.util.UiUtils.GREY_OUT;
 
 @UiThread
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/contactselection/ContactSelectorActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/contactselection/ContactSelectorActivity.java
index a11f3a6fd..8f9002f59 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/contactselection/ContactSelectorActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/contactselection/ContactSelectorActivity.java
@@ -1,9 +1,6 @@
 package org.briarproject.briar.android.contactselection;
 
 import android.os.Bundle;
-import android.support.annotation.CallSuper;
-import android.support.annotation.LayoutRes;
-import android.support.annotation.UiThread;
 
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
@@ -19,6 +16,10 @@ import java.util.List;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.CallSuper;
+import androidx.annotation.LayoutRes;
+import androidx.annotation.UiThread;
+
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 public abstract class ContactSelectorActivity
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/contactselection/ContactSelectorListener.java b/briar-android/src/main/java/org/briarproject/briar/android/contactselection/ContactSelectorListener.java
index 3aaae432a..b9dc45d2a 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/contactselection/ContactSelectorListener.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/contactselection/ContactSelectorListener.java
@@ -1,12 +1,12 @@
 package org.briarproject.briar.android.contactselection;
 
-import android.support.annotation.UiThread;
-
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
 import java.util.Collection;
 
+import androidx.annotation.UiThread;
+
 @NotNullByDefault
 public interface ContactSelectorListener {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/contactselection/SelectableContactHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/contactselection/SelectableContactHolder.java
index b4435d6cf..cf0d2cdab 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/contactselection/SelectableContactHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/contactselection/SelectableContactHolder.java
@@ -1,6 +1,5 @@
 package org.briarproject.briar.android.contactselection;
 
-import android.support.annotation.UiThread;
 import android.view.View;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
@@ -8,6 +7,8 @@ import org.briarproject.briar.android.contact.BaseContactListAdapter.OnContactCl
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.UiThread;
+
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/controller/BriarControllerImpl.java b/briar-android/src/main/java/org/briarproject/briar/android/controller/BriarControllerImpl.java
index 7eb7a1bce..2e4479716 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/controller/BriarControllerImpl.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/controller/BriarControllerImpl.java
@@ -3,7 +3,6 @@ package org.briarproject.briar.android.controller;
 import android.app.Activity;
 import android.content.Intent;
 import android.os.IBinder;
-import android.support.annotation.CallSuper;
 
 import org.briarproject.bramble.api.account.AccountManager;
 import org.briarproject.bramble.api.db.DatabaseExecutor;
@@ -21,6 +20,8 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
+import androidx.annotation.CallSuper;
+
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.STARTING_SERVICES;
 import static org.briarproject.bramble.util.LogUtils.logException;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/controller/SharingController.java b/briar-android/src/main/java/org/briarproject/briar/android/controller/SharingController.java
index 904046249..c098e82b5 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/controller/SharingController.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/controller/SharingController.java
@@ -1,12 +1,12 @@
 package org.briarproject.briar.android.controller;
 
-import android.support.annotation.UiThread;
-
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
 import java.util.Collection;
 
+import androidx.annotation.UiThread;
+
 @NotNullByDefault
 public interface SharingController {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/controller/SharingControllerImpl.java b/briar-android/src/main/java/org/briarproject/briar/android/controller/SharingControllerImpl.java
index bffd4a7d5..9cdc47cdb 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/controller/SharingControllerImpl.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/controller/SharingControllerImpl.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.controller;
 
-import android.support.annotation.UiThread;
-
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.event.EventBus;
@@ -18,6 +16,8 @@ import java.util.Set;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.annotation.UiThread;
+
 @NotNullByDefault
 public class SharingControllerImpl implements SharingController, EventListener {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/controller/handler/UiExceptionHandler.java b/briar-android/src/main/java/org/briarproject/briar/android/controller/handler/UiExceptionHandler.java
index 20859ad97..abf7d2712 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/controller/handler/UiExceptionHandler.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/controller/handler/UiExceptionHandler.java
@@ -1,12 +1,12 @@
 package org.briarproject.briar.android.controller.handler;
 
-import android.support.annotation.UiThread;
-
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.android.DestroyableContext;
 
 import javax.annotation.concurrent.Immutable;
 
+import androidx.annotation.UiThread;
+
 @Immutable
 @NotNullByDefault
 public abstract class UiExceptionHandler<E extends Exception>
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/controller/handler/UiResultExceptionHandler.java b/briar-android/src/main/java/org/briarproject/briar/android/controller/handler/UiResultExceptionHandler.java
index 1c9b11b2c..d2cd5c04f 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/controller/handler/UiResultExceptionHandler.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/controller/handler/UiResultExceptionHandler.java
@@ -1,12 +1,12 @@
 package org.briarproject.briar.android.controller.handler;
 
-import android.support.annotation.UiThread;
-
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.android.DestroyableContext;
 
 import javax.annotation.concurrent.Immutable;
 
+import androidx.annotation.UiThread;
+
 @Immutable
 @NotNullByDefault
 public abstract class UiResultExceptionHandler<R, E extends Exception>
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/controller/handler/UiResultHandler.java b/briar-android/src/main/java/org/briarproject/briar/android/controller/handler/UiResultHandler.java
index 5e0081af6..e0d3ebdcf 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/controller/handler/UiResultHandler.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/controller/handler/UiResultHandler.java
@@ -1,9 +1,9 @@
 package org.briarproject.briar.android.controller.handler;
 
-import android.support.annotation.UiThread;
-
 import org.briarproject.briar.android.DestroyableContext;
 
+import androidx.annotation.UiThread;
+
 public abstract class UiResultHandler<R> implements ResultHandler<R> {
 
 	private final DestroyableContext listener;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/AliasDialogFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/AliasDialogFragment.java
index 9502ba86a..4144ca31d 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/AliasDialogFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/AliasDialogFragment.java
@@ -1,18 +1,15 @@
 package org.briarproject.briar.android.conversation;
 
-import android.arch.lifecycle.ViewModelProvider;
-import android.arch.lifecycle.ViewModelProviders;
 import android.content.Context;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.design.widget.TextInputLayout;
-import android.support.v7.app.AppCompatDialogFragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
 import android.widget.EditText;
 
+import com.google.android.material.textfield.TextInputLayout;
+
 import org.briarproject.bramble.api.contact.Contact;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
@@ -21,6 +18,11 @@ import org.briarproject.briar.android.activity.BaseActivity;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatDialogFragment;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.lifecycle.ViewModelProviders;
+
 import static android.view.WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE;
 import static java.util.Objects.requireNonNull;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_AUTHOR_NAME_LENGTH;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationActivity.java
index 852f82bff..349e84c82 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationActivity.java
@@ -1,23 +1,10 @@
 package org.briarproject.briar.android.conversation;
 
 import android.annotation.SuppressLint;
-import android.arch.lifecycle.Observer;
-import android.arch.lifecycle.ViewModelProvider;
-import android.arch.lifecycle.ViewModelProviders;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.Bundle;
 import android.os.Parcelable;
-import android.support.annotation.Nullable;
-import android.support.annotation.UiThread;
-import android.support.design.widget.Snackbar;
-import android.support.v4.app.ActivityCompat;
-import android.support.v4.app.ActivityOptionsCompat;
-import android.support.v4.content.ContextCompat;
-import android.support.v7.app.AlertDialog;
-import android.support.v7.widget.ActionMenuView;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.Toolbar;
 import android.transition.Slide;
 import android.transition.Transition;
 import android.util.SparseArray;
@@ -29,6 +16,8 @@ import android.widget.ImageView;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import com.google.android.material.snackbar.Snackbar;
+
 import org.briarproject.bramble.api.FeatureFlags;
 import org.briarproject.bramble.api.Pair;
 import org.briarproject.bramble.api.contact.ContactId;
@@ -98,17 +87,29 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+import androidx.annotation.UiThread;
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.widget.ActionMenuView;
+import androidx.appcompat.widget.Toolbar;
+import androidx.core.app.ActivityCompat;
+import androidx.core.app.ActivityOptionsCompat;
+import androidx.core.content.ContextCompat;
+import androidx.lifecycle.Observer;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.lifecycle.ViewModelProviders;
+import androidx.recyclerview.widget.LinearLayoutManager;
 import de.hdodenhof.circleimageview.CircleImageView;
 import im.delight.android.identicons.IdenticonDrawable;
 import uk.co.samuelwall.materialtaptargetprompt.MaterialTapTargetPrompt;
 
-import static android.arch.lifecycle.Lifecycle.State.STARTED;
 import static android.os.Build.VERSION.SDK_INT;
-import static android.support.v4.app.ActivityOptionsCompat.makeSceneTransitionAnimation;
-import static android.support.v4.view.ViewCompat.setTransitionName;
-import static android.support.v7.util.SortedList.INVALID_POSITION;
 import static android.view.Gravity.RIGHT;
 import static android.widget.Toast.LENGTH_SHORT;
+import static androidx.core.app.ActivityOptionsCompat.makeSceneTransitionAnimation;
+import static androidx.core.view.ViewCompat.setTransitionName;
+import static androidx.lifecycle.Lifecycle.State.STARTED;
+import static androidx.recyclerview.widget.SortedList.INVALID_POSITION;
 import static java.util.Collections.emptyList;
 import static java.util.Collections.singletonList;
 import static java.util.Collections.sort;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationAdapter.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationAdapter.java
index b9fa34812..13bde921a 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationAdapter.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationAdapter.java
@@ -1,9 +1,6 @@
 package org.briarproject.briar.android.conversation;
 
 import android.content.Context;
-import android.support.annotation.LayoutRes;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.RecyclerView.RecycledViewPool;
 import android.util.SparseArray;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -18,6 +15,10 @@ import org.briarproject.briar.android.util.ItemReturningAdapter;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.LayoutRes;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView.RecycledViewPool;
+
 @NotNullByDefault
 class ConversationAdapter
 		extends BriarAdapter<ConversationItem, ConversationItemViewHolder>
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationItem.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationItem.java
index 5fb4c5b4b..f70ce35bc 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationItem.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationItem.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.conversation;
 
-import android.support.annotation.LayoutRes;
-
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.bramble.api.sync.MessageId;
@@ -10,6 +8,8 @@ import org.briarproject.briar.api.conversation.ConversationMessageHeader;
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.NotThreadSafe;
 
+import androidx.annotation.LayoutRes;
+
 @NotThreadSafe
 @NotNullByDefault
 abstract class ConversationItem {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationItemViewHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationItemViewHolder.java
index 8ffa2ab4b..77b1b9156 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationItemViewHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationItemViewHolder.java
@@ -1,16 +1,17 @@
 package org.briarproject.briar.android.conversation;
 
-import android.support.annotation.CallSuper;
-import android.support.annotation.Nullable;
-import android.support.annotation.UiThread;
-import android.support.constraint.ConstraintLayout;
-import android.support.v7.widget.RecyclerView.ViewHolder;
 import android.view.View;
 import android.widget.TextView;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 
+import androidx.annotation.CallSuper;
+import androidx.annotation.Nullable;
+import androidx.annotation.UiThread;
+import androidx.constraintlayout.widget.ConstraintLayout;
+import androidx.recyclerview.widget.RecyclerView.ViewHolder;
+
 import static org.briarproject.bramble.util.StringUtils.trim;
 import static org.briarproject.briar.android.util.UiUtils.formatDate;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationListener.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationListener.java
index d961ff1e2..700608e3a 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationListener.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationListener.java
@@ -1,11 +1,12 @@
 package org.briarproject.briar.android.conversation;
 
-import android.support.annotation.UiThread;
 import android.view.View;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.android.attachment.AttachmentItem;
 
+import androidx.annotation.UiThread;
+
 @UiThread
 @NotNullByDefault
 interface ConversationListener {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationMessageItem.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationMessageItem.java
index 6b853932a..b3e20b3f7 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationMessageItem.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationMessageItem.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.conversation;
 
-import android.support.annotation.LayoutRes;
-
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.android.attachment.AttachmentItem;
 import org.briarproject.briar.api.messaging.PrivateMessageHeader;
@@ -10,6 +8,8 @@ import java.util.List;
 
 import javax.annotation.concurrent.NotThreadSafe;
 
+import androidx.annotation.LayoutRes;
+
 @NotThreadSafe
 @NotNullByDefault
 class ConversationMessageItem extends ConversationItem {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationMessageViewHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationMessageViewHolder.java
index 6524129b4..4d5f11561 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationMessageViewHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationMessageViewHolder.java
@@ -1,9 +1,5 @@
 package org.briarproject.briar.android.conversation;
 
-import android.support.annotation.UiThread;
-import android.support.constraint.ConstraintSet;
-import android.support.v7.widget.RecyclerView;
-import android.support.v7.widget.RecyclerView.RecycledViewPool;
 import android.view.View;
 import android.view.ViewGroup;
 
@@ -11,8 +7,13 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.attachment.AttachmentItem;
 
-import static android.support.constraint.ConstraintSet.WRAP_CONTENT;
-import static android.support.v4.content.ContextCompat.getColor;
+import androidx.annotation.UiThread;
+import androidx.constraintlayout.widget.ConstraintSet;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView.RecycledViewPool;
+
+import static androidx.constraintlayout.widget.ConstraintSet.WRAP_CONTENT;
+import static androidx.core.content.ContextCompat.getColor;
 
 @UiThread
 @NotNullByDefault
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationNoticeItem.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationNoticeItem.java
index 7ae4ccb9d..0694a0762 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationNoticeItem.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationNoticeItem.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.conversation;
 
-import android.support.annotation.LayoutRes;
-
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.api.conversation.ConversationRequest;
 import org.briarproject.briar.api.conversation.ConversationResponse;
@@ -9,6 +7,8 @@ import org.briarproject.briar.api.conversation.ConversationResponse;
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.NotThreadSafe;
 
+import androidx.annotation.LayoutRes;
+
 @NotThreadSafe
 @NotNullByDefault
 class ConversationNoticeItem extends ConversationItem {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationNoticeViewHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationNoticeViewHolder.java
index 8f34e168b..1e70f0560 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationNoticeViewHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationNoticeViewHolder.java
@@ -1,13 +1,14 @@
 package org.briarproject.briar.android.conversation;
 
-import android.support.annotation.CallSuper;
-import android.support.annotation.UiThread;
 import android.view.View;
 import android.widget.TextView;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 
+import androidx.annotation.CallSuper;
+import androidx.annotation.UiThread;
+
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationRequestItem.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationRequestItem.java
index aee78cece..71984db65 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationRequestItem.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationRequestItem.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.conversation;
 
-import android.support.annotation.LayoutRes;
-
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.briar.api.client.SessionId;
@@ -12,6 +10,8 @@ import org.briarproject.briar.api.sharing.Shareable;
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.NotThreadSafe;
 
+import androidx.annotation.LayoutRes;
+
 @NotThreadSafe
 @NotNullByDefault
 class ConversationRequestItem extends ConversationNoticeItem {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationRequestViewHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationRequestViewHolder.java
index 7270846fe..3792ee0dc 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationRequestViewHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationRequestViewHolder.java
@@ -1,12 +1,13 @@
 package org.briarproject.briar.android.conversation;
 
-import android.support.annotation.UiThread;
 import android.view.View;
 import android.widget.Button;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 
+import androidx.annotation.UiThread;
+
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationViewModel.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationViewModel.java
index 9886c9895..6670bf5ea 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationViewModel.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationViewModel.java
@@ -1,13 +1,7 @@
 package org.briarproject.briar.android.conversation;
 
 import android.app.Application;
-import android.arch.lifecycle.AndroidViewModel;
-import android.arch.lifecycle.LiveData;
-import android.arch.lifecycle.MutableLiveData;
-import android.arch.lifecycle.Transformations;
 import android.net.Uri;
-import android.support.annotation.Nullable;
-import android.support.annotation.UiThread;
 
 import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.contact.Contact;
@@ -44,6 +38,13 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+import androidx.annotation.UiThread;
+import androidx.lifecycle.AndroidViewModel;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+import androidx.lifecycle.Transformations;
+
 import static java.util.Objects.requireNonNull;
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationVisitor.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationVisitor.java
index c7d8fc9a4..3d4080f03 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationVisitor.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationVisitor.java
@@ -1,8 +1,6 @@
 package org.briarproject.briar.android.conversation;
 
-import android.arch.lifecycle.LiveData;
 import android.content.Context;
-import android.support.annotation.UiThread;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.MessageId;
@@ -23,6 +21,9 @@ import java.util.List;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.UiThread;
+import androidx.lifecycle.LiveData;
+
 import static java.util.Collections.emptyList;
 import static org.briarproject.briar.android.conversation.ConversationRequestItem.RequestType.BLOG;
 import static org.briarproject.briar.android.conversation.ConversationRequestItem.RequestType.FORUM;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageActivity.java
index 5da18922d..749ef495c 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageActivity.java
@@ -1,22 +1,9 @@
 package org.briarproject.briar.android.conversation;
 
-import android.arch.lifecycle.ViewModelProvider;
-import android.arch.lifecycle.ViewModelProviders;
 import android.content.DialogInterface.OnClickListener;
 import android.content.Intent;
 import android.graphics.drawable.Drawable;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.annotation.RequiresApi;
-import android.support.design.widget.AppBarLayout;
-import android.support.v4.app.Fragment;
-import android.support.v4.app.FragmentManager;
-import android.support.v4.app.FragmentStatePagerAdapter;
-import android.support.v4.content.ContextCompat;
-import android.support.v4.graphics.drawable.DrawableCompat;
-import android.support.v4.view.ViewPager;
-import android.support.v7.app.AlertDialog.Builder;
-import android.support.v7.widget.Toolbar;
 import android.transition.Fade;
 import android.transition.Transition;
 import android.view.Menu;
@@ -26,6 +13,8 @@ import android.view.ViewTreeObserver.OnGlobalLayoutListener;
 import android.view.Window;
 import android.widget.TextView;
 
+import com.google.android.material.appbar.AppBarLayout;
+
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
@@ -42,18 +31,31 @@ import java.util.Locale;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
+import androidx.appcompat.app.AlertDialog.Builder;
+import androidx.appcompat.widget.Toolbar;
+import androidx.core.content.ContextCompat;
+import androidx.core.graphics.drawable.DrawableCompat;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentStatePagerAdapter;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.lifecycle.ViewModelProviders;
+import androidx.viewpager.widget.ViewPager;
+
 import static android.content.Intent.ACTION_CREATE_DOCUMENT;
 import static android.content.Intent.CATEGORY_OPENABLE;
 import static android.content.Intent.EXTRA_TITLE;
 import static android.graphics.Color.TRANSPARENT;
 import static android.os.Build.VERSION.SDK_INT;
-import static android.support.design.widget.Snackbar.LENGTH_LONG;
 import static android.view.View.GONE;
 import static android.view.View.SYSTEM_UI_FLAG_FULLSCREEN;
 import static android.view.View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
 import static android.view.View.SYSTEM_UI_FLAG_LAYOUT_STABLE;
 import static android.view.View.VISIBLE;
 import static android.view.WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS;
+import static com.google.android.material.snackbar.Snackbar.LENGTH_LONG;
 import static java.util.Objects.requireNonNull;
 import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_SAVE_ATTACHMENT;
 import static org.briarproject.briar.android.util.UiUtils.formatDateAbsolute;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageAdapter.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageAdapter.java
index f97a5f233..9f456f71b 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageAdapter.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageAdapter.java
@@ -2,8 +2,6 @@ package org.briarproject.briar.android.conversation;
 
 import android.content.Context;
 import android.content.res.Resources;
-import android.support.annotation.Nullable;
-import android.support.v7.widget.RecyclerView.Adapter;
 import android.util.DisplayMetrics;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -18,6 +16,9 @@ import org.briarproject.briar.android.conversation.glide.Radii;
 import java.util.ArrayList;
 import java.util.List;
 
+import androidx.annotation.Nullable;
+import androidx.recyclerview.widget.RecyclerView.Adapter;
+
 import static android.content.Context.WINDOW_SERVICE;
 import static java.util.Objects.requireNonNull;
 import static org.briarproject.briar.android.util.UiUtils.isRtl;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageFragment.java
index 684e216a8..9f8ee39d4 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageFragment.java
@@ -1,13 +1,9 @@
 package org.briarproject.briar.android.conversation;
 
-import android.arch.lifecycle.ViewModelProvider;
-import android.arch.lifecycle.ViewModelProviders;
 import android.content.Context;
 import android.graphics.drawable.Animatable;
 import android.graphics.drawable.Drawable;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.v4.app.Fragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -27,6 +23,11 @@ import org.briarproject.briar.android.conversation.glide.GlideApp;
 import javax.annotation.ParametersAreNonnullByDefault;
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.lifecycle.ViewModelProviders;
+
 import static android.os.Build.VERSION.SDK_INT;
 import static android.widget.ImageView.ScaleType.FIT_START;
 import static com.bumptech.glide.load.engine.DiskCacheStrategy.NONE;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageItemDecoration.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageItemDecoration.java
index e72d44cce..3f1ee6568 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageItemDecoration.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageItemDecoration.java
@@ -3,14 +3,15 @@ package org.briarproject.briar.android.conversation;
 import android.content.Context;
 import android.content.res.Resources;
 import android.graphics.Rect;
-import android.support.v7.widget.RecyclerView;
-import android.support.v7.widget.RecyclerView.ItemDecoration;
-import android.support.v7.widget.RecyclerView.State;
 import android.view.View;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView.ItemDecoration;
+import androidx.recyclerview.widget.RecyclerView.State;
+
 import static org.briarproject.briar.android.conversation.ImageAdapter.isBottomRow;
 import static org.briarproject.briar.android.conversation.ImageAdapter.isLeft;
 import static org.briarproject.briar.android.conversation.ImageAdapter.isTopRow;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageViewHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageViewHolder.java
index 4019bb4f4..76eaab5e3 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageViewHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageViewHolder.java
@@ -1,9 +1,6 @@
 package org.briarproject.briar.android.conversation;
 
 import android.graphics.Bitmap;
-import android.support.annotation.DrawableRes;
-import android.support.v7.widget.RecyclerView.ViewHolder;
-import android.support.v7.widget.StaggeredGridLayoutManager.LayoutParams;
 import android.view.View;
 import android.widget.ImageView;
 
@@ -16,6 +13,10 @@ import org.briarproject.briar.android.conversation.glide.BriarImageTransformatio
 import org.briarproject.briar.android.conversation.glide.GlideApp;
 import org.briarproject.briar.android.conversation.glide.Radii;
 
+import androidx.annotation.DrawableRes;
+import androidx.recyclerview.widget.RecyclerView.ViewHolder;
+import androidx.recyclerview.widget.StaggeredGridLayoutManager.LayoutParams;
+
 import static android.os.Build.VERSION.SDK_INT;
 import static com.bumptech.glide.load.engine.DiskCacheStrategy.NONE;
 import static com.bumptech.glide.load.resource.drawable.DrawableTransitionOptions.withCrossFade;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageViewModel.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageViewModel.java
index 7218efa5f..0c251cf60 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageViewModel.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageViewModel.java
@@ -1,11 +1,8 @@
 package org.briarproject.briar.android.conversation;
 
 import android.app.Application;
-import android.arch.lifecycle.AndroidViewModel;
 import android.graphics.drawable.Drawable;
 import android.net.Uri;
-import android.support.annotation.Nullable;
-import android.support.annotation.UiThread;
 import android.view.View;
 
 import org.briarproject.bramble.api.db.DatabaseExecutor;
@@ -31,6 +28,10 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+import androidx.annotation.UiThread;
+import androidx.lifecycle.AndroidViewModel;
+
 import static android.media.MediaScannerConnection.scanFile;
 import static android.os.Environment.DIRECTORY_PICTURES;
 import static android.os.Environment.getExternalStoragePublicDirectory;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/OutItemViewHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/OutItemViewHolder.java
index 9fe7b4b92..5fee04f20 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/OutItemViewHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/OutItemViewHolder.java
@@ -1,12 +1,13 @@
 package org.briarproject.briar.android.conversation;
 
-import android.support.annotation.UiThread;
 import android.view.View;
 import android.widget.ImageView;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 
+import androidx.annotation.UiThread;
+
 @UiThread
 @NotNullByDefault
 class OutItemViewHolder {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/glide/BriarDataFetcher.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/glide/BriarDataFetcher.java
index 852b8c536..d208ab475 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/glide/BriarDataFetcher.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/glide/BriarDataFetcher.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.conversation.glide;
 
-import android.support.annotation.Nullable;
-
 import com.bumptech.glide.Priority;
 import com.bumptech.glide.load.DataSource;
 import com.bumptech.glide.load.data.DataFetcher;
@@ -19,6 +17,8 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+
 import static com.bumptech.glide.load.DataSource.LOCAL;
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/glide/CustomCornersTransformation.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/glide/CustomCornersTransformation.java
index a6a11c640..3c237be6f 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/glide/CustomCornersTransformation.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/glide/CustomCornersTransformation.java
@@ -5,7 +5,6 @@ import android.graphics.BitmapShader;
 import android.graphics.Canvas;
 import android.graphics.Paint;
 import android.graphics.RectF;
-import android.support.annotation.NonNull;
 
 import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
 import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;
@@ -16,6 +15,8 @@ import java.security.MessageDigest;
 
 import javax.annotation.concurrent.Immutable;
 
+import androidx.annotation.NonNull;
+
 import static android.graphics.Bitmap.Config.ARGB_8888;
 import static android.graphics.Shader.TileMode.CLAMP;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/conversation/glide/Radii.java b/briar-android/src/main/java/org/briarproject/briar/android/conversation/glide/Radii.java
index 318140ff0..4f773edd0 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/conversation/glide/Radii.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/conversation/glide/Radii.java
@@ -1,9 +1,9 @@
 package org.briarproject.briar.android.conversation.glide;
 
-import android.support.annotation.Nullable;
-
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
+import androidx.annotation.Nullable;
+
 @NotNullByDefault
 public class Radii {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/forum/CreateForumActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/forum/CreateForumActivity.java
index 7d093a630..c17592e37 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/forum/CreateForumActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/forum/CreateForumActivity.java
@@ -2,7 +2,6 @@ package org.briarproject.briar.android.forum;
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.design.widget.TextInputLayout;
 import android.text.Editable;
 import android.text.TextWatcher;
 import android.widget.Button;
@@ -10,6 +9,8 @@ import android.widget.EditText;
 import android.widget.ProgressBar;
 import android.widget.Toast;
 
+import com.google.android.material.textfield.TextInputLayout;
+
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/forum/ForumActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/forum/ForumActivity.java
index 21df7e485..3fedef567 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/forum/ForumActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/forum/ForumActivity.java
@@ -3,10 +3,6 @@ package org.briarproject.briar.android.forum;
 import android.content.DialogInterface.OnClickListener;
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.annotation.StringRes;
-import android.support.v7.app.AlertDialog;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.Toolbar;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
@@ -30,6 +26,10 @@ import org.briarproject.briar.api.forum.Forum;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.widget.Toolbar;
+import androidx.recyclerview.widget.LinearLayoutManager;
+
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 import static android.widget.Toast.LENGTH_SHORT;
 import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_SHARE_FORUM;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/forum/ForumController.java b/briar-android/src/main/java/org/briarproject/briar/android/forum/ForumController.java
index a9e5d661f..5f11f4e1d 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/forum/ForumController.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/forum/ForumController.java
@@ -1,12 +1,12 @@
 package org.briarproject.briar.android.forum;
 
-import android.support.annotation.UiThread;
-
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.android.threaded.ThreadListController;
 import org.briarproject.briar.api.forum.Forum;
 
+import androidx.annotation.UiThread;
+
 @NotNullByDefault
 interface ForumController extends ThreadListController<Forum, ForumItem> {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/forum/ForumListAdapter.java b/briar-android/src/main/java/org/briarproject/briar/android/forum/ForumListAdapter.java
index f16e83970..77cebffac 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/forum/ForumListAdapter.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/forum/ForumListAdapter.java
@@ -2,7 +2,6 @@ package org.briarproject.briar.android.forum;
 
 import android.content.Context;
 import android.content.Intent;
-import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -15,9 +14,11 @@ import org.briarproject.briar.android.util.UiUtils;
 import org.briarproject.briar.android.view.TextAvatarView;
 import org.briarproject.briar.api.forum.Forum;
 
-import static android.support.v7.util.SortedList.INVALID_POSITION;
+import androidx.recyclerview.widget.RecyclerView;
+
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
+import static androidx.recyclerview.widget.SortedList.INVALID_POSITION;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_NAME;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/forum/ForumListFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/forum/ForumListFragment.java
index 9b02d4151..ee3b54e7d 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/forum/ForumListFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/forum/ForumListFragment.java
@@ -2,9 +2,6 @@ package org.briarproject.briar.android.forum;
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.annotation.UiThread;
-import android.support.design.widget.Snackbar;
-import android.support.v7.widget.LinearLayoutManager;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -13,6 +10,8 @@ import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.ViewGroup;
 
+import com.google.android.material.snackbar.Snackbar;
+
 import org.briarproject.bramble.api.contact.event.ContactRemovedEvent;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.NoSuchGroupException;
@@ -44,7 +43,10 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
-import static android.support.design.widget.Snackbar.LENGTH_INDEFINITE;
+import androidx.annotation.UiThread;
+import androidx.recyclerview.widget.LinearLayoutManager;
+
+import static com.google.android.material.snackbar.Snackbar.LENGTH_INDEFINITE;
 import static java.util.Objects.requireNonNull;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/fragment/BaseFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/fragment/BaseFragment.java
index 5ddf206f3..6f7a5cfc9 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/fragment/BaseFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/fragment/BaseFragment.java
@@ -3,10 +3,6 @@ package org.briarproject.briar.android.fragment;
 import android.app.Activity;
 import android.content.Context;
 import android.os.Bundle;
-import android.support.annotation.CallSuper;
-import android.support.annotation.UiThread;
-import android.support.v4.app.Fragment;
-import android.support.v4.app.FragmentActivity;
 import android.view.MenuItem;
 
 import org.briarproject.bramble.api.db.DbException;
@@ -17,6 +13,11 @@ import org.briarproject.briar.android.activity.ActivityComponent;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.CallSuper;
+import androidx.annotation.UiThread;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentActivity;
+
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 public abstract class BaseFragment extends Fragment
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/fragment/ErrorFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/fragment/ErrorFragment.java
index 6506fcc71..3b8807f0d 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/fragment/ErrorFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/fragment/ErrorFragment.java
@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.fragment;
 
 import android.os.Bundle;
-import android.support.annotation.Nullable;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -11,6 +10,8 @@ import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 
+import androidx.annotation.Nullable;
+
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/fragment/ScreenFilterDialogFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/fragment/ScreenFilterDialogFragment.java
index f4247b162..5de6feb0c 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/fragment/ScreenFilterDialogFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/fragment/ScreenFilterDialogFragment.java
@@ -6,8 +6,6 @@ import android.app.Dialog;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.os.Bundle;
-import android.support.v4.app.DialogFragment;
-import android.support.v7.app.AlertDialog;
 import android.text.TextUtils;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -27,6 +25,9 @@ import java.util.Collection;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.appcompat.app.AlertDialog;
+import androidx.fragment.app.DialogFragment;
+
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 public class ScreenFilterDialogFragment extends DialogFragment {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/introduction/ContactChooserFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/introduction/ContactChooserFragment.java
index bce8e07db..19c982029 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/introduction/ContactChooserFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/introduction/ContactChooserFragment.java
@@ -1,9 +1,6 @@
 package org.briarproject.briar.android.introduction;
 
 import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.annotation.UiThread;
-import android.support.v7.widget.LinearLayoutManager;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -31,6 +28,10 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+import androidx.annotation.UiThread;
+import androidx.recyclerview.widget.LinearLayoutManager;
+
 import static java.util.Objects.requireNonNull;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logException;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/introduction/IntroductionMessageFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/introduction/IntroductionMessageFragment.java
index fd9b77592..62072e4bf 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/introduction/IntroductionMessageFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/introduction/IntroductionMessageFragment.java
@@ -2,8 +2,6 @@ package org.briarproject.briar.android.introduction;
 
 import android.content.Context;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.v7.app.ActionBar;
 import android.view.LayoutInflater;
 import android.view.MenuItem;
 import android.view.View;
@@ -32,6 +30,8 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.ActionBar;
 import de.hdodenhof.circleimageview.CircleImageView;
 import im.delight.android.identicons.IdenticonDrawable;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/CameraView.java b/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/CameraView.java
index bbb027939..f21f4bfb8 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/CameraView.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/CameraView.java
@@ -6,8 +6,6 @@ import android.hardware.Camera.AutoFocusCallback;
 import android.hardware.Camera.CameraInfo;
 import android.hardware.Camera.Parameters;
 import android.hardware.Camera.Size;
-import android.support.annotation.Nullable;
-import android.support.annotation.UiThread;
 import android.util.AttributeSet;
 import android.view.Display;
 import android.view.Surface;
@@ -23,6 +21,9 @@ import java.io.IOException;
 import java.util.List;
 import java.util.logging.Logger;
 
+import androidx.annotation.Nullable;
+import androidx.annotation.UiThread;
+
 import static android.content.Context.WINDOW_SERVICE;
 import static android.hardware.Camera.CameraInfo.CAMERA_FACING_BACK;
 import static android.hardware.Camera.CameraInfo.CAMERA_FACING_FRONT;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/ContactExchangeActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/ContactExchangeActivity.java
index 56ef169b0..062f12059 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/ContactExchangeActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/ContactExchangeActivity.java
@@ -1,9 +1,6 @@
 package org.briarproject.briar.android.keyagreement;
 
-import android.arch.lifecycle.ViewModelProvider;
-import android.arch.lifecycle.ViewModelProviders;
 import android.os.Bundle;
-import android.support.annotation.UiThread;
 import android.widget.Toast;
 
 import org.briarproject.bramble.api.identity.Author;
@@ -16,6 +13,10 @@ import org.briarproject.briar.android.activity.ActivityComponent;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.annotation.UiThread;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.lifecycle.ViewModelProviders;
+
 import static android.widget.Toast.LENGTH_LONG;
 import static java.util.Objects.requireNonNull;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/ContactExchangeErrorFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/ContactExchangeErrorFragment.java
index 0cdf84d31..733b50a6a 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/ContactExchangeErrorFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/ContactExchangeErrorFragment.java
@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.keyagreement;
 
 import android.os.Bundle;
-import android.support.annotation.Nullable;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -18,6 +17,8 @@ import org.briarproject.briar.android.util.UiUtils;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+
 import static org.briarproject.briar.android.util.UiUtils.onSingleLinkClick;
 
 @MethodsNotNullByDefault
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/ContactExchangeModule.java b/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/ContactExchangeModule.java
index 65baf1e70..05a539d5c 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/ContactExchangeModule.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/ContactExchangeModule.java
@@ -1,9 +1,8 @@
 package org.briarproject.briar.android.keyagreement;
 
-import android.arch.lifecycle.ViewModel;
-
 import org.briarproject.briar.android.viewmodel.ViewModelKey;
 
+import androidx.lifecycle.ViewModel;
 import dagger.Binds;
 import dagger.Module;
 import dagger.multibindings.IntoMap;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/ContactExchangeViewModel.java b/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/ContactExchangeViewModel.java
index 7a274bdc9..d37a19b84 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/ContactExchangeViewModel.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/ContactExchangeViewModel.java
@@ -1,10 +1,6 @@
 package org.briarproject.briar.android.keyagreement;
 
 import android.app.Application;
-import android.arch.lifecycle.AndroidViewModel;
-import android.arch.lifecycle.LiveData;
-import android.arch.lifecycle.MutableLiveData;
-import android.support.annotation.UiThread;
 
 import org.briarproject.bramble.api.contact.Contact;
 import org.briarproject.bramble.api.contact.ContactExchangeManager;
@@ -25,6 +21,11 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.annotation.UiThread;
+import androidx.lifecycle.AndroidViewModel;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.logException;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/KeyAgreementActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/KeyAgreementActivity.java
index 05c2546e6..16d8e2a03 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/KeyAgreementActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/KeyAgreementActivity.java
@@ -6,12 +6,6 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.os.Bundle;
-import android.support.annotation.StringRes;
-import android.support.annotation.UiThread;
-import android.support.v4.app.ActivityCompat;
-import android.support.v4.app.FragmentManager;
-import android.support.v7.app.AlertDialog.Builder;
-import android.support.v7.widget.Toolbar;
 import android.view.MenuItem;
 
 import org.briarproject.bramble.api.event.EventBus;
@@ -32,6 +26,13 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.annotation.StringRes;
+import androidx.annotation.UiThread;
+import androidx.appcompat.app.AlertDialog.Builder;
+import androidx.appcompat.widget.Toolbar;
+import androidx.core.app.ActivityCompat;
+import androidx.fragment.app.FragmentManager;
+
 import static android.Manifest.permission.ACCESS_COARSE_LOCATION;
 import static android.Manifest.permission.CAMERA;
 import static android.bluetooth.BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE;
@@ -217,7 +218,7 @@ public abstract class KeyAgreementActivity extends BriarActivity implements
 				if (bt.getScanMode() == SCAN_MODE_CONNECTABLE_DISCOVERABLE)
 					setBluetoothState(BluetoothState.DISCOVERABLE);
 			}
-		}
+		} else super.onActivityResult(request, result, data);
 	}
 
 	private void showQrCodeFragment() {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/KeyAgreementFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/KeyAgreementFragment.java
index e2b449126..2c5d7f1f8 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/KeyAgreementFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/KeyAgreementFragment.java
@@ -3,7 +3,6 @@ package org.briarproject.briar.android.keyagreement;
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.os.Bundle;
-import android.support.annotation.UiThread;
 import android.util.DisplayMetrics;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -47,6 +46,8 @@ import javax.annotation.Nullable;
 import javax.inject.Inject;
 import javax.inject.Provider;
 
+import androidx.annotation.UiThread;
+
 import static android.content.pm.ActivityInfo.SCREEN_ORIENTATION_NOSENSOR;
 import static android.view.View.INVISIBLE;
 import static android.view.View.VISIBLE;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/PreviewConsumer.java b/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/PreviewConsumer.java
index 11735caeb..bea7b65b8 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/PreviewConsumer.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/PreviewConsumer.java
@@ -1,10 +1,11 @@
 package org.briarproject.briar.android.keyagreement;
 
 import android.hardware.Camera;
-import android.support.annotation.UiThread;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
+import androidx.annotation.UiThread;
+
 @SuppressWarnings("deprecation")
 @NotNullByDefault
 interface PreviewConsumer {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/QrCodeDecoder.java b/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/QrCodeDecoder.java
index 7b018be03..91f6f9dda 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/QrCodeDecoder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/keyagreement/QrCodeDecoder.java
@@ -5,7 +5,6 @@ import android.hardware.Camera.CameraInfo;
 import android.hardware.Camera.PreviewCallback;
 import android.hardware.Camera.Size;
 import android.os.AsyncTask;
-import android.support.annotation.UiThread;
 
 import com.google.zxing.BinaryBitmap;
 import com.google.zxing.LuminanceSource;
@@ -22,6 +21,8 @@ import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 
 import java.util.logging.Logger;
 
+import androidx.annotation.UiThread;
+
 import static com.google.zxing.DecodeHintType.CHARACTER_SET;
 import static java.util.Collections.singletonMap;
 import static java.util.logging.Level.WARNING;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/login/ChangePasswordActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/login/ChangePasswordActivity.java
index 0f0a91004..7c4b4f36b 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/login/ChangePasswordActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/login/ChangePasswordActivity.java
@@ -1,8 +1,6 @@
 package org.briarproject.briar.android.login;
 
 import android.os.Bundle;
-import android.support.annotation.NonNull;
-import android.support.design.widget.TextInputLayout;
 import android.text.Editable;
 import android.text.TextWatcher;
 import android.view.KeyEvent;
@@ -15,6 +13,8 @@ import android.widget.TextView;
 import android.widget.TextView.OnEditorActionListener;
 import android.widget.Toast;
 
+import com.google.android.material.textfield.TextInputLayout;
+
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BriarActivity;
@@ -23,6 +23,8 @@ import org.briarproject.briar.android.util.UiUtils;
 
 import javax.inject.Inject;
 
+import androidx.annotation.NonNull;
+
 import static android.view.View.INVISIBLE;
 import static android.view.View.VISIBLE;
 import static org.briarproject.bramble.api.crypto.PasswordStrengthEstimator.QUITE_WEAK;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/login/OpenDatabaseFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/login/OpenDatabaseFragment.java
index f92080554..ad8843cbd 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/login/OpenDatabaseFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/login/OpenDatabaseFragment.java
@@ -1,9 +1,6 @@
 package org.briarproject.briar.android.login;
 
-import android.arch.lifecycle.ViewModelProvider;
-import android.arch.lifecycle.ViewModelProviders;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -18,6 +15,10 @@ import org.briarproject.briar.android.fragment.BaseFragment;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.lifecycle.ViewModelProviders;
+
 import static org.briarproject.briar.android.login.StartupViewModel.State;
 import static org.briarproject.briar.android.login.StartupViewModel.State.COMPACTING;
 import static org.briarproject.briar.android.login.StartupViewModel.State.MIGRATING;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/login/PasswordFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/login/PasswordFragment.java
index d4f872d5b..778259c76 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/login/PasswordFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/login/PasswordFragment.java
@@ -1,11 +1,6 @@
 package org.briarproject.briar.android.login;
 
-import android.arch.lifecycle.ViewModelProvider;
-import android.arch.lifecycle.ViewModelProviders;
 import android.os.Bundle;
-import android.support.design.widget.TextInputEditText;
-import android.support.design.widget.TextInputLayout;
-import android.support.v7.app.AlertDialog;
 import android.text.Editable;
 import android.text.TextWatcher;
 import android.view.LayoutInflater;
@@ -14,6 +9,9 @@ import android.view.ViewGroup;
 import android.widget.Button;
 import android.widget.ProgressBar;
 
+import com.google.android.material.textfield.TextInputEditText;
+import com.google.android.material.textfield.TextInputLayout;
+
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
@@ -23,6 +21,10 @@ import org.briarproject.briar.android.fragment.BaseFragment;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.appcompat.app.AlertDialog;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.lifecycle.ViewModelProviders;
+
 import static android.view.View.INVISIBLE;
 import static android.view.View.VISIBLE;
 import static android.view.inputmethod.EditorInfo.IME_ACTION_DONE;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/login/StartupActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/login/StartupActivity.java
index 5b80169e5..faf469c28 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/login/StartupActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/login/StartupActivity.java
@@ -1,10 +1,7 @@
 package org.briarproject.briar.android.login;
 
-import android.arch.lifecycle.ViewModelProvider;
-import android.arch.lifecycle.ViewModelProviders;
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
 
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
@@ -18,6 +15,10 @@ import org.briarproject.briar.android.login.StartupViewModel.State;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.lifecycle.ViewModelProviders;
+
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TASK;
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/login/StartupViewModel.java b/briar-android/src/main/java/org/briarproject/briar/android/login/StartupViewModel.java
index d87f312fc..192c085f3 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/login/StartupViewModel.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/login/StartupViewModel.java
@@ -1,10 +1,6 @@
 package org.briarproject.briar.android.login;
 
 import android.app.Application;
-import android.arch.lifecycle.AndroidViewModel;
-import android.arch.lifecycle.LiveData;
-import android.arch.lifecycle.MutableLiveData;
-import android.support.annotation.UiThread;
 
 import org.briarproject.bramble.api.account.AccountManager;
 import org.briarproject.bramble.api.event.Event;
@@ -23,6 +19,11 @@ import java.util.concurrent.Executor;
 
 import javax.inject.Inject;
 
+import androidx.annotation.UiThread;
+import androidx.lifecycle.AndroidViewModel;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.COMPACTING_DATABASE;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.MIGRATING_DATABASE;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.STARTING_SERVICES;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/login/StrengthMeter.java b/briar-android/src/main/java/org/briarproject/briar/android/login/StrengthMeter.java
index 05c71f4a6..dcd80c2a3 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/login/StrengthMeter.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/login/StrengthMeter.java
@@ -7,10 +7,11 @@ import android.graphics.drawable.ClipDrawable;
 import android.graphics.drawable.Drawable;
 import android.graphics.drawable.LayerDrawable;
 import android.graphics.drawable.ShapeDrawable;
-import android.support.annotation.Nullable;
 import android.util.AttributeSet;
 import android.widget.ProgressBar;
 
+import androidx.annotation.Nullable;
+
 import static android.graphics.Color.BLACK;
 import static android.graphics.Paint.Style.FILL;
 import static android.graphics.Paint.Style.STROKE;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/navdrawer/NavDrawerActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/navdrawer/NavDrawerActivity.java
index ae6b6ac15..1c71573c8 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/navdrawer/NavDrawerActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/navdrawer/NavDrawerActivity.java
@@ -5,19 +5,6 @@ import android.content.Intent;
 import android.content.res.Configuration;
 import android.net.Uri;
 import android.os.Bundle;
-import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
-import android.support.annotation.UiThread;
-import android.support.design.widget.NavigationView;
-import android.support.design.widget.NavigationView.OnNavigationItemSelectedListener;
-import android.support.v4.app.ActivityCompat;
-import android.support.v4.app.FragmentManager;
-import android.support.v4.app.FragmentTransaction;
-import android.support.v4.content.ContextCompat;
-import android.support.v4.widget.DrawerLayout;
-import android.support.v7.app.ActionBar;
-import android.support.v7.app.ActionBarDrawerToggle;
-import android.support.v7.widget.Toolbar;
 import android.view.LayoutInflater;
 import android.view.MenuItem;
 import android.view.View;
@@ -27,6 +14,9 @@ import android.widget.GridView;
 import android.widget.ImageView;
 import android.widget.TextView;
 
+import com.google.android.material.navigation.NavigationView;
+import com.google.android.material.navigation.NavigationView.OnNavigationItemSelectedListener;
+
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
@@ -54,11 +44,23 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
-import static android.support.v4.app.FragmentManager.POP_BACK_STACK_INCLUSIVE;
-import static android.support.v4.view.GravityCompat.START;
-import static android.support.v4.widget.DrawerLayout.LOCK_MODE_LOCKED_CLOSED;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.UiThread;
+import androidx.appcompat.app.ActionBar;
+import androidx.appcompat.app.ActionBarDrawerToggle;
+import androidx.appcompat.widget.Toolbar;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
+import androidx.drawerlayout.widget.DrawerLayout;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentTransaction;
+
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
+import static androidx.core.view.GravityCompat.START;
+import static androidx.drawerlayout.widget.DrawerLayout.LOCK_MODE_LOCKED_CLOSED;
+import static androidx.fragment.app.FragmentManager.POP_BACK_STACK_INCLUSIVE;
 import static java.util.Objects.requireNonNull;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.RUNNING;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/navdrawer/TransportStateListener.java b/briar-android/src/main/java/org/briarproject/briar/android/navdrawer/TransportStateListener.java
index 9fa6d8009..f47e311e3 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/navdrawer/TransportStateListener.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/navdrawer/TransportStateListener.java
@@ -1,9 +1,9 @@
 package org.briarproject.briar.android.navdrawer;
 
-import android.support.annotation.UiThread;
-
 import org.briarproject.bramble.api.plugin.TransportId;
 
+import androidx.annotation.UiThread;
+
 interface TransportStateListener {
 
 	@UiThread
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/panic/PanicPreferencesActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/panic/PanicPreferencesActivity.java
index 9c19c78b1..6017e50ae 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/panic/PanicPreferencesActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/panic/PanicPreferencesActivity.java
@@ -1,13 +1,14 @@
 package org.briarproject.briar.android.panic;
 
 import android.os.Bundle;
-import android.support.v7.app.ActionBar;
 import android.view.MenuItem;
 
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BriarActivity;
 
+import androidx.appcompat.app.ActionBar;
+
 public class PanicPreferencesActivity extends BriarActivity {
 
 	@Override
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/panic/PanicPreferencesFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/panic/PanicPreferencesFragment.java
index 90812d2eb..2f4f1ac6a 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/panic/PanicPreferencesFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/panic/PanicPreferencesFragment.java
@@ -8,10 +8,6 @@ import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
 import android.net.Uri;
 import android.os.Bundle;
-import android.support.v14.preference.SwitchPreference;
-import android.support.v7.app.AlertDialog;
-import android.support.v7.preference.ListPreference;
-import android.support.v7.preference.PreferenceFragmentCompat;
 import android.text.TextUtils;
 
 import org.briarproject.briar.R;
@@ -21,6 +17,10 @@ import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
 
+import androidx.appcompat.app.AlertDialog;
+import androidx.preference.ListPreference;
+import androidx.preference.PreferenceFragmentCompat;
+import androidx.preference.SwitchPreference;
 import info.guardianproject.panic.PanicResponder;
 
 import static android.app.Activity.RESULT_CANCELED;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/panic/PanicResponderActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/panic/PanicResponderActivity.java
index dfa9fa079..b1ca57ee6 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/panic/PanicResponderActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/panic/PanicResponderActivity.java
@@ -3,7 +3,6 @@ package org.briarproject.briar.android.panic;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.os.Bundle;
-import android.support.v7.preference.PreferenceManager;
 
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
@@ -17,6 +16,7 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.preference.PreferenceManager;
 import info.guardianproject.GuardianProjectRSA4096;
 import info.guardianproject.panic.Panic;
 import info.guardianproject.panic.PanicResponder;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/VisibilityHelper.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/VisibilityHelper.java
index 6c9de8c76..1b8920e7c 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/VisibilityHelper.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/VisibilityHelper.java
@@ -1,11 +1,12 @@
 package org.briarproject.briar.android.privategroup;
 
 import android.content.Context;
-import android.support.annotation.DrawableRes;
 
 import org.briarproject.briar.R;
 import org.briarproject.briar.api.privategroup.Visibility;
 
+import androidx.annotation.DrawableRes;
+
 import static org.briarproject.briar.api.privategroup.Visibility.INVISIBLE;
 
 public class VisibilityHelper {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/GroupActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/GroupActivity.java
index 0c63ccf87..e89ef6cee 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/GroupActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/GroupActivity.java
@@ -4,9 +4,6 @@ import android.content.DialogInterface;
 import android.content.DialogInterface.OnClickListener;
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.v7.app.AlertDialog;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.Toolbar;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
@@ -33,6 +30,10 @@ import org.briarproject.briar.api.privategroup.Visibility;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.widget.Toolbar;
+import androidx.recyclerview.widget.LinearLayoutManager;
+
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_GROUP_INVITE;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/GroupController.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/GroupController.java
index 5f7cba4d6..571f55bf1 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/GroupController.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/GroupController.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.privategroup.conversation;
 
-import android.support.annotation.UiThread;
-
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.identity.AuthorId;
@@ -11,6 +9,8 @@ import org.briarproject.briar.android.threaded.ThreadListController;
 import org.briarproject.briar.api.privategroup.PrivateGroup;
 import org.briarproject.briar.api.privategroup.Visibility;
 
+import androidx.annotation.UiThread;
+
 public interface GroupController
 		extends ThreadListController<PrivateGroup, GroupMessageItem> {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/GroupMessageAdapter.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/GroupMessageAdapter.java
index b511804f3..3b67f8b94 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/GroupMessageAdapter.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/GroupMessageAdapter.java
@@ -1,8 +1,5 @@
 package org.briarproject.briar.android.privategroup.conversation;
 
-import android.support.annotation.LayoutRes;
-import android.support.annotation.UiThread;
-import android.support.v7.widget.LinearLayoutManager;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -15,7 +12,11 @@ import org.briarproject.briar.android.threaded.ThreadItemAdapter;
 import org.briarproject.briar.android.threaded.ThreadPostViewHolder;
 import org.briarproject.briar.api.privategroup.Visibility;
 
-import static android.support.v7.widget.RecyclerView.NO_POSITION;
+import androidx.annotation.LayoutRes;
+import androidx.annotation.UiThread;
+import androidx.recyclerview.widget.LinearLayoutManager;
+
+import static androidx.recyclerview.widget.RecyclerView.NO_POSITION;
 
 @UiThread
 @NotNullByDefault
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/GroupMessageItem.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/GroupMessageItem.java
index 27ce086e9..315beff27 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/GroupMessageItem.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/GroupMessageItem.java
@@ -1,8 +1,5 @@
 package org.briarproject.briar.android.privategroup.conversation;
 
-import android.support.annotation.LayoutRes;
-import android.support.annotation.UiThread;
-
 import org.briarproject.bramble.api.identity.Author;
 import org.briarproject.bramble.api.identity.AuthorInfo;
 import org.briarproject.bramble.api.sync.GroupId;
@@ -14,6 +11,9 @@ import org.briarproject.briar.api.privategroup.GroupMessageHeader;
 import javax.annotation.Nullable;
 import javax.annotation.concurrent.NotThreadSafe;
 
+import androidx.annotation.LayoutRes;
+import androidx.annotation.UiThread;
+
 @UiThread
 @NotThreadSafe
 class GroupMessageItem extends ThreadItem {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/JoinMessageItem.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/JoinMessageItem.java
index 405a862d0..592962371 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/JoinMessageItem.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/JoinMessageItem.java
@@ -1,14 +1,14 @@
 package org.briarproject.briar.android.privategroup.conversation;
 
-import android.support.annotation.LayoutRes;
-import android.support.annotation.UiThread;
-
 import org.briarproject.briar.R;
 import org.briarproject.briar.api.privategroup.JoinMessageHeader;
 import org.briarproject.briar.api.privategroup.Visibility;
 
 import javax.annotation.concurrent.NotThreadSafe;
 
+import androidx.annotation.LayoutRes;
+import androidx.annotation.UiThread;
+
 @UiThread
 @NotThreadSafe
 class JoinMessageItem extends GroupMessageItem {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/JoinMessageItemViewHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/JoinMessageItemViewHolder.java
index 5b1274fd7..e6c1e9c98 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/JoinMessageItemViewHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/JoinMessageItemViewHolder.java
@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.privategroup.conversation;
 
 import android.content.Context;
-import android.support.annotation.UiThread;
 import android.view.View;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
@@ -9,6 +8,8 @@ import org.briarproject.briar.R;
 import org.briarproject.briar.android.threaded.BaseThreadItemViewHolder;
 import org.briarproject.briar.android.threaded.ThreadItemAdapter.ThreadItemListener;
 
+import androidx.annotation.UiThread;
+
 import static org.briarproject.bramble.api.identity.AuthorInfo.Status.OURSELVES;
 
 @UiThread
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/CreateGroupController.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/CreateGroupController.java
index 6d4692c71..ffd605c98 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/CreateGroupController.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/CreateGroupController.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.privategroup.creation;
 
-import android.support.annotation.Nullable;
-
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
@@ -12,6 +10,8 @@ import org.briarproject.briar.android.controller.handler.ResultExceptionHandler;
 
 import java.util.Collection;
 
+import androidx.annotation.Nullable;
+
 @NotNullByDefault
 public interface CreateGroupController
 		extends ContactSelectorController<SelectableContactItem> {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/CreateGroupControllerImpl.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/CreateGroupControllerImpl.java
index 75ddbb53d..88355a63b 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/CreateGroupControllerImpl.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/CreateGroupControllerImpl.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.privategroup.creation;
 
-import android.support.annotation.Nullable;
-
 import org.briarproject.bramble.api.contact.Contact;
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.contact.ContactManager;
@@ -34,6 +32,8 @@ import java.util.logging.Logger;
 import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/CreateGroupFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/CreateGroupFragment.java
index 373d6c3ea..141091fdd 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/CreateGroupFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/CreateGroupFragment.java
@@ -2,8 +2,6 @@ package org.briarproject.briar.android.privategroup.creation;
 
 import android.content.Context;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.design.widget.TextInputLayout;
 import android.text.Editable;
 import android.text.TextWatcher;
 import android.view.LayoutInflater;
@@ -13,6 +11,8 @@ import android.widget.Button;
 import android.widget.EditText;
 import android.widget.ProgressBar;
 
+import com.google.android.material.textfield.TextInputLayout;
+
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.util.StringUtils;
@@ -20,6 +20,8 @@ import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.fragment.BaseFragment;
 
+import androidx.annotation.Nullable;
+
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 import static android.view.inputmethod.EditorInfo.IME_ACTION_DONE;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/CreateGroupMessageFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/CreateGroupMessageFragment.java
index dec906b6f..19e8fefee 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/CreateGroupMessageFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/CreateGroupMessageFragment.java
@@ -1,12 +1,12 @@
 package org.briarproject.briar.android.privategroup.creation;
 
-import android.support.annotation.StringRes;
-
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.sharing.BaseMessageFragment;
 
+import androidx.annotation.StringRes;
+
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 public class CreateGroupMessageFragment extends BaseMessageFragment {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/GroupInviteFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/GroupInviteFragment.java
index dc6da1aea..afc963b83 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/GroupInviteFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/GroupInviteFragment.java
@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.privategroup.creation;
 
 import android.os.Bundle;
-import android.support.annotation.Nullable;
 
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
@@ -14,6 +13,8 @@ import org.briarproject.briar.android.contactselection.SelectableContactItem;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+
 import static java.util.Objects.requireNonNull;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupListAdapter.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupListAdapter.java
index a42bf3a78..d6fb8cc35 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupListAdapter.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupListAdapter.java
@@ -12,7 +12,7 @@ import org.briarproject.briar.R;
 import org.briarproject.briar.android.privategroup.list.GroupViewHolder.OnGroupRemoveClickListener;
 import org.briarproject.briar.android.util.BriarAdapter;
 
-import static android.support.v7.util.SortedList.INVALID_POSITION;
+import static androidx.recyclerview.widget.SortedList.INVALID_POSITION;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupListController.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupListController.java
index bfe8440b5..5c030c0f0 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupListController.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupListController.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.privategroup.list;
 
-import android.support.annotation.UiThread;
-
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
@@ -12,6 +10,8 @@ import org.briarproject.briar.api.privategroup.GroupMessageHeader;
 
 import java.util.Collection;
 
+import androidx.annotation.UiThread;
+
 @NotNullByDefault
 interface GroupListController extends DbController {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupListControllerImpl.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupListControllerImpl.java
index caccc9142..75fa033c3 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupListControllerImpl.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupListControllerImpl.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.privategroup.list;
 
-import android.support.annotation.CallSuper;
-
 import org.briarproject.bramble.api.contact.ContactManager;
 import org.briarproject.bramble.api.db.DatabaseExecutor;
 import org.briarproject.bramble.api.db.DbException;
@@ -40,6 +38,8 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
+import androidx.annotation.CallSuper;
+
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
 import static org.briarproject.bramble.util.LogUtils.logException;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupListFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupListFragment.java
index 83f9e44e6..1fe13900d 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupListFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupListFragment.java
@@ -2,9 +2,6 @@ package org.briarproject.briar.android.privategroup.list;
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.annotation.UiThread;
-import android.support.design.widget.Snackbar;
-import android.support.v7.widget.LinearLayoutManager;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -13,6 +10,8 @@ import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.ViewGroup;
 
+import com.google.android.material.snackbar.Snackbar;
+
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
@@ -36,7 +35,10 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
-import static android.support.design.widget.Snackbar.LENGTH_INDEFINITE;
+import androidx.annotation.UiThread;
+import androidx.recyclerview.widget.LinearLayoutManager;
+
+import static com.google.android.material.snackbar.Snackbar.LENGTH_INDEFINITE;
 import static java.util.Objects.requireNonNull;
 
 @MethodsNotNullByDefault
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupViewHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupViewHolder.java
index ce63ad29f..f1c50eefb 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupViewHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupViewHolder.java
@@ -2,7 +2,6 @@ package org.briarproject.briar.android.privategroup.list;
 
 import android.content.Context;
 import android.content.Intent;
-import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
@@ -16,6 +15,8 @@ import org.briarproject.briar.android.privategroup.conversation.GroupActivity;
 import org.briarproject.briar.android.util.UiUtils;
 import org.briarproject.briar.android.view.TextAvatarView;
 
+import androidx.recyclerview.widget.RecyclerView;
+
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/memberlist/GroupMemberListActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/memberlist/GroupMemberListActivity.java
index 4b59821c9..6a6fe5a7a 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/memberlist/GroupMemberListActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/memberlist/GroupMemberListActivity.java
@@ -2,7 +2,6 @@ package org.briarproject.briar.android.privategroup.memberlist;
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.v7.widget.LinearLayoutManager;
 import android.view.MenuItem;
 import android.widget.TextView;
 
@@ -27,6 +26,8 @@ import java.util.Collection;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.recyclerview.widget.LinearLayoutManager;
+
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 public class GroupMemberListActivity extends BriarActivity
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/memberlist/MemberListAdapter.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/memberlist/MemberListAdapter.java
index 2b1634c4f..cec23eea1 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/memberlist/MemberListAdapter.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/memberlist/MemberListAdapter.java
@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.privategroup.memberlist;
 
 import android.content.Context;
-import android.support.annotation.NonNull;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -9,6 +8,8 @@ import android.view.ViewGroup;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.util.BriarAdapter;
 
+import androidx.annotation.NonNull;
+
 import static org.briarproject.briar.android.util.UiUtils.getContactDisplayName;
 
 class MemberListAdapter extends
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/memberlist/MemberListItemHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/memberlist/MemberListItemHolder.java
index ce9eb7fb9..c0713a0cd 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/memberlist/MemberListItemHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/memberlist/MemberListItemHolder.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.privategroup.memberlist;
 
-import android.support.annotation.UiThread;
-import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.widget.ImageView;
 import android.widget.TextView;
@@ -10,6 +8,9 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.view.AuthorView;
 
+import androidx.annotation.UiThread;
+import androidx.recyclerview.widget.RecyclerView;
+
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 import static org.briarproject.bramble.api.identity.AuthorInfo.Status.OURSELVES;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/reveal/RevealContactsActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/reveal/RevealContactsActivity.java
index 239269e6a..2e906f5e4 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/reveal/RevealContactsActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/reveal/RevealContactsActivity.java
@@ -2,8 +2,6 @@ package org.briarproject.briar.android.privategroup.reveal;
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.annotation.LayoutRes;
-import android.support.v7.app.AlertDialog;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
@@ -27,6 +25,9 @@ import java.util.Collection;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.annotation.LayoutRes;
+import androidx.appcompat.app.AlertDialog;
+
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 public class RevealContactsActivity extends ContactSelectorActivity
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/reveal/RevealableContactViewHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/reveal/RevealableContactViewHolder.java
index f32c34522..87edf059c 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/privategroup/reveal/RevealableContactViewHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/privategroup/reveal/RevealableContactViewHolder.java
@@ -1,6 +1,5 @@
 package org.briarproject.briar.android.privategroup.reveal;
 
-import android.support.annotation.UiThread;
 import android.view.View;
 import android.widget.ImageView;
 
@@ -11,6 +10,8 @@ import org.briarproject.briar.android.contactselection.BaseSelectableContactHold
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.UiThread;
+
 import static org.briarproject.briar.android.privategroup.VisibilityHelper.getVisibilityIcon;
 import static org.briarproject.briar.android.privategroup.VisibilityHelper.getVisibilityString;
 import static org.briarproject.briar.android.util.UiUtils.GREY_OUT;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/reporting/BriarReportPrimer.java b/briar-android/src/main/java/org/briarproject/briar/android/reporting/BriarReportPrimer.java
index 47b0b3bbe..827838cb6 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/reporting/BriarReportPrimer.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/reporting/BriarReportPrimer.java
@@ -12,7 +12,6 @@ import android.os.Environment;
 import android.os.Handler;
 import android.os.Looper;
 import android.provider.Settings;
-import android.support.annotation.NonNull;
 
 import org.acra.builder.ReportBuilder;
 import org.acra.builder.ReportPrimer;
@@ -33,6 +32,8 @@ import java.util.concurrent.FutureTask;
 import java.util.logging.Formatter;
 import java.util.logging.LogRecord;
 
+import androidx.annotation.NonNull;
+
 import static android.bluetooth.BluetoothAdapter.SCAN_MODE_CONNECTABLE;
 import static android.bluetooth.BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE;
 import static android.content.Context.ACTIVITY_SERVICE;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/reporting/BriarReportSender.java b/briar-android/src/main/java/org/briarproject/briar/android/reporting/BriarReportSender.java
index f4d9b5aef..312ab6b51 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/reporting/BriarReportSender.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/reporting/BriarReportSender.java
@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.reporting;
 
 import android.content.Context;
-import android.support.annotation.NonNull;
 
 import org.acra.collector.CrashReportData;
 import org.acra.sender.ReportSender;
@@ -15,6 +14,8 @@ import java.io.FileNotFoundException;
 
 import javax.inject.Inject;
 
+import androidx.annotation.NonNull;
+
 import static org.acra.ReportField.REPORT_ID;
 
 public class BriarReportSender implements ReportSender {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/reporting/BriarReportSenderFactory.java b/briar-android/src/main/java/org/briarproject/briar/android/reporting/BriarReportSenderFactory.java
index c474f4a89..365948952 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/reporting/BriarReportSenderFactory.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/reporting/BriarReportSenderFactory.java
@@ -1,13 +1,14 @@
 package org.briarproject.briar.android.reporting;
 
 import android.content.Context;
-import android.support.annotation.NonNull;
 
 import org.acra.config.ACRAConfiguration;
 import org.acra.sender.ReportSender;
 import org.acra.sender.ReportSenderFactory;
 import org.briarproject.briar.android.BriarApplication;
 
+import androidx.annotation.NonNull;
+
 public class BriarReportSenderFactory implements ReportSenderFactory {
 
 	@NonNull
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/reporting/CrashFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/reporting/CrashFragment.java
index 102cdbf11..beaf7f3c5 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/reporting/CrashFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/reporting/CrashFragment.java
@@ -1,8 +1,6 @@
 package org.briarproject.briar.android.reporting;
 
 import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.v4.app.Fragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -11,6 +9,9 @@ import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+
 import static java.util.Objects.requireNonNull;
 
 @MethodsNotNullByDefault
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/reporting/DevReportActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/reporting/DevReportActivity.java
index d958f1494..4861bdb50 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/reporting/DevReportActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/reporting/DevReportActivity.java
@@ -4,10 +4,6 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.res.Configuration;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.v4.app.Fragment;
-import android.support.v7.app.AppCompatDelegate;
-import android.support.v7.widget.Toolbar;
 
 import org.acra.dialog.BaseCrashReportDialog;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
@@ -19,6 +15,12 @@ import org.briarproject.briar.android.util.UserFeedback;
 
 import java.io.File;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatDelegate;
+import androidx.appcompat.widget.Toolbar;
+import androidx.fragment.app.Fragment;
+
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TASK;
 import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
 import static android.content.Intent.FLAG_ACTIVITY_NO_ANIMATION;
@@ -46,17 +48,16 @@ public class DevReportActivity extends BaseCrashReportDialog {
 		super.preInit(savedInstanceState);
 		getDelegate().installViewFactory();
 		getDelegate().onCreate(savedInstanceState);
-		if (getDelegate().applyDayNight()) {
-			// If DayNight has been applied, we need to re-apply the theme for
-			// the changes to take effect. On API 23+, we should bypass
-			// setTheme(), which will no-op if the theme ID is identical to the
-			// current theme ID.
-			int theme = R.style.BriarTheme_NoActionBar;
-			if (SDK_INT >= 23) {
-				onApplyThemeResource(getTheme(), theme, false);
-			} else {
-				setTheme(theme);
-			}
+		getDelegate().applyDayNight();
+		// We always need to re-apply the theme
+		// for day/night the changes to take effect.
+		// On API 23+, we should bypass setTheme(), which will no-op
+		// if the theme ID is identical to the current theme ID.
+		int theme = R.style.BriarTheme_NoActionBar;
+		if (SDK_INT >= 23) {
+			onApplyThemeResource(getTheme(), theme, false);
+		} else {
+			setTheme(theme);
 		}
 	}
 
@@ -90,6 +91,12 @@ public class DevReportActivity extends BaseCrashReportDialog {
 		getDelegate().onPostCreate(state);
 	}
 
+	@Override
+	protected void onStart() {
+		super.onStart();
+		getDelegate().onStart();
+	}
+
 	@Override
 	protected void onPostResume() {
 		super.onPostResume();
@@ -108,6 +115,12 @@ public class DevReportActivity extends BaseCrashReportDialog {
 		getDelegate().onConfigurationChanged(newConfig);
 	}
 
+	@Override
+	protected void onSaveInstanceState(@NonNull Bundle outState) {
+		super.onSaveInstanceState(outState);
+		getDelegate().onSaveInstanceState(outState);
+	}
+
 	@Override
 	public void onStop() {
 		super.onStop();
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/reporting/ReportFormFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/reporting/ReportFormFragment.java
index 7de1b5f85..32edfede3 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/reporting/ReportFormFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/reporting/ReportFormFragment.java
@@ -2,8 +2,6 @@ package org.briarproject.briar.android.reporting;
 
 import android.os.AsyncTask;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.v4.app.Fragment;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -35,6 +33,9 @@ import java.util.Map;
 import java.util.Set;
 import java.util.logging.Logger;
 
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+
 import static android.view.MenuItem.SHOW_AS_ACTION_ALWAYS;
 import static android.view.View.GONE;
 import static android.view.View.INVISIBLE;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/settings/SettingsActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/settings/SettingsActivity.java
index 48b4b7fa9..311711b1b 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/settings/SettingsActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/settings/SettingsActivity.java
@@ -1,13 +1,14 @@
 package org.briarproject.briar.android.settings;
 
 import android.os.Bundle;
-import android.support.v7.app.ActionBar;
 import android.view.MenuItem;
 
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BriarActivity;
 
+import androidx.appcompat.app.ActionBar;
+
 public class SettingsActivity extends BriarActivity {
 
 	@Override
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/settings/SettingsFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/settings/SettingsFragment.java
index b03d91816..dc7096db0 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/settings/SettingsFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/settings/SettingsFragment.java
@@ -9,15 +9,6 @@ import android.media.Ringtone;
 import android.media.RingtoneManager;
 import android.net.Uri;
 import android.os.Bundle;
-import android.support.annotation.StringRes;
-import android.support.v14.preference.SwitchPreference;
-import android.support.v4.content.ContextCompat;
-import android.support.v4.text.TextUtilsCompat;
-import android.support.v7.preference.ListPreference;
-import android.support.v7.preference.Preference;
-import android.support.v7.preference.Preference.OnPreferenceChangeListener;
-import android.support.v7.preference.PreferenceFragmentCompat;
-import android.support.v7.preference.PreferenceGroup;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -50,6 +41,16 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
+import androidx.annotation.StringRes;
+import androidx.core.content.ContextCompat;
+import androidx.core.text.TextUtilsCompat;
+import androidx.preference.ListPreference;
+import androidx.preference.Preference;
+import androidx.preference.Preference.OnPreferenceChangeListener;
+import androidx.preference.PreferenceFragmentCompat;
+import androidx.preference.PreferenceGroup;
+import androidx.preference.SwitchPreference;
+
 import static android.app.Activity.RESULT_OK;
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TASK;
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
@@ -67,8 +68,8 @@ import static android.provider.Settings.ACTION_CHANNEL_NOTIFICATION_SETTINGS;
 import static android.provider.Settings.EXTRA_APP_PACKAGE;
 import static android.provider.Settings.EXTRA_CHANNEL_ID;
 import static android.provider.Settings.System.DEFAULT_NOTIFICATION_URI;
-import static android.support.v4.view.ViewCompat.LAYOUT_DIRECTION_LTR;
 import static android.widget.Toast.LENGTH_SHORT;
+import static androidx.core.view.ViewCompat.LAYOUT_DIRECTION_LTR;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.PREF_BT_ENABLE;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/sharing/BaseMessageFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/sharing/BaseMessageFragment.java
index cb5a4b299..1d33fd83e 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/sharing/BaseMessageFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/sharing/BaseMessageFragment.java
@@ -2,9 +2,6 @@ package org.briarproject.briar.android.sharing;
 
 import android.content.Context;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.annotation.StringRes;
-import android.support.annotation.UiThread;
 import android.view.LayoutInflater;
 import android.view.MenuItem;
 import android.view.View;
@@ -22,6 +19,10 @@ import org.briarproject.briar.api.messaging.AttachmentHeader;
 
 import java.util.List;
 
+import androidx.annotation.Nullable;
+import androidx.annotation.StringRes;
+import androidx.annotation.UiThread;
+
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 public abstract class BaseMessageFragment extends BaseFragment
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/sharing/InvitationActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/sharing/InvitationActivity.java
index 77d3b2eb3..ab83a50a1 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/sharing/InvitationActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/sharing/InvitationActivity.java
@@ -2,8 +2,6 @@ package org.briarproject.briar.android.sharing;
 
 import android.content.Context;
 import android.os.Bundle;
-import android.support.annotation.StringRes;
-import android.support.v7.widget.LinearLayoutManager;
 import android.widget.Toast;
 
 import org.briarproject.bramble.api.db.DbException;
@@ -22,6 +20,9 @@ import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.StringRes;
+import androidx.recyclerview.widget.LinearLayoutManager;
+
 import static android.widget.Toast.LENGTH_SHORT;
 import static org.briarproject.briar.android.sharing.InvitationAdapter.InvitationClickListener;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/sharing/InvitationAdapter.java b/briar-android/src/main/java/org/briarproject/briar/android/sharing/InvitationAdapter.java
index ab08e79b7..3a75313a2 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/sharing/InvitationAdapter.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/sharing/InvitationAdapter.java
@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.sharing;
 
 import android.content.Context;
-import android.support.annotation.NonNull;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -10,6 +9,8 @@ import org.briarproject.briar.R;
 import org.briarproject.briar.android.util.BriarAdapter;
 import org.briarproject.briar.api.sharing.InvitationItem;
 
+import androidx.annotation.NonNull;
+
 public abstract class InvitationAdapter<I extends InvitationItem, VH extends InvitationViewHolder<I>>
 		extends BriarAdapter<I, VH> {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/sharing/InvitationControllerImpl.java b/briar-android/src/main/java/org/briarproject/briar/android/sharing/InvitationControllerImpl.java
index 48acb9212..47b0ba5b7 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/sharing/InvitationControllerImpl.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/sharing/InvitationControllerImpl.java
@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.sharing;
 
 import android.app.Activity;
-import android.support.annotation.CallSuper;
 
 import org.briarproject.bramble.api.contact.event.ContactRemovedEvent;
 import org.briarproject.bramble.api.db.DatabaseExecutor;
@@ -24,6 +23,8 @@ import java.util.Collection;
 import java.util.concurrent.Executor;
 import java.util.logging.Logger;
 
+import androidx.annotation.CallSuper;
+
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
 import static org.briarproject.bramble.util.LogUtils.logException;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/sharing/InvitationViewHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/sharing/InvitationViewHolder.java
index 0a258b2c2..c9c0d233b 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/sharing/InvitationViewHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/sharing/InvitationViewHolder.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.sharing;
 
-import android.support.annotation.CallSuper;
-import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.widget.Button;
 import android.widget.TextView;
@@ -13,6 +11,9 @@ import org.briarproject.briar.api.sharing.InvitationItem;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.CallSuper;
+import androidx.recyclerview.widget.RecyclerView;
+
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/sharing/ShareActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/sharing/ShareActivity.java
index 4d39005a2..dbba270a2 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/sharing/ShareActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/sharing/ShareActivity.java
@@ -2,7 +2,6 @@ package org.briarproject.briar.android.sharing;
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.annotation.UiThread;
 
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
@@ -15,6 +14,8 @@ import java.util.Collection;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.UiThread;
+
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 public abstract class ShareActivity extends ContactSelectorActivity
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/sharing/ShareBlogMessageFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/sharing/ShareBlogMessageFragment.java
index 0acd4d575..e2ed19bc3 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/sharing/ShareBlogMessageFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/sharing/ShareBlogMessageFragment.java
@@ -1,8 +1,6 @@
 package org.briarproject.briar.android.sharing;
 
 import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.annotation.StringRes;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -11,6 +9,9 @@ import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 
+import androidx.annotation.Nullable;
+import androidx.annotation.StringRes;
+
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 public class ShareBlogMessageFragment extends BaseMessageFragment {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/sharing/ShareForumMessageFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/sharing/ShareForumMessageFragment.java
index 1cb07447f..b86bcb0fe 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/sharing/ShareForumMessageFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/sharing/ShareForumMessageFragment.java
@@ -1,8 +1,6 @@
 package org.briarproject.briar.android.sharing;
 
 import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.annotation.StringRes;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -11,6 +9,9 @@ import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 
+import androidx.annotation.Nullable;
+import androidx.annotation.StringRes;
+
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 public class ShareForumMessageFragment extends BaseMessageFragment {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/sharing/SharingStatusActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/sharing/SharingStatusActivity.java
index e237f7e8f..a6dcd9516 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/sharing/SharingStatusActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/sharing/SharingStatusActivity.java
@@ -2,9 +2,6 @@ package org.briarproject.briar.android.sharing;
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.annotation.CallSuper;
-import android.support.annotation.StringRes;
-import android.support.v7.widget.LinearLayoutManager;
 import android.view.MenuItem;
 import android.widget.TextView;
 
@@ -33,6 +30,10 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import androidx.annotation.CallSuper;
+import androidx.annotation.StringRes;
+import androidx.recyclerview.widget.LinearLayoutManager;
+
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/splash/ExpiredActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/splash/ExpiredActivity.java
index 3e068d4a9..7db01bf85 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/splash/ExpiredActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/splash/ExpiredActivity.java
@@ -3,12 +3,13 @@ package org.briarproject.briar.android.splash;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.Bundle;
-import android.support.v7.app.AppCompatActivity;
 import android.view.View;
 import android.view.View.OnClickListener;
 
 import org.briarproject.briar.R;
 
+import androidx.appcompat.app.AppCompatActivity;
+
 import static android.content.Intent.ACTION_VIEW;
 import static android.view.WindowManager.LayoutParams.FLAG_SECURE;
 import static org.briarproject.briar.android.TestingConstants.PREVENT_SCREENSHOTS;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/splash/SplashScreenActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/splash/SplashScreenActivity.java
index 4e8998fea..85aa5bb42 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/splash/SplashScreenActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/splash/SplashScreenActivity.java
@@ -22,11 +22,11 @@ import javax.inject.Inject;
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
 import static android.os.Build.VERSION.SDK_INT;
-import static android.support.v7.preference.PreferenceManager.setDefaultValues;
+import static androidx.preference.PreferenceManager.setDefaultValues;
 import static java.lang.System.currentTimeMillis;
 import static java.util.logging.Logger.getLogger;
-import static org.briarproject.briar.android.TestingConstants.EXPIRY_DATE;
 import static org.briarproject.briar.android.BriarApplication.ENTRY_ACTIVITY;
+import static org.briarproject.briar.android.TestingConstants.EXPIRY_DATE;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/test/TestDataActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/test/TestDataActivity.java
index ad96f9999..f9f98185b 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/test/TestDataActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/test/TestDataActivity.java
@@ -2,7 +2,6 @@ package org.briarproject.briar.android.test;
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.v7.app.ActionBar;
 import android.view.MenuItem;
 import android.widget.SeekBar;
 import android.widget.SeekBar.OnSeekBarChangeListener;
@@ -15,6 +14,8 @@ import org.briarproject.briar.api.test.TestDataCreator;
 
 import javax.inject.Inject;
 
+import androidx.appcompat.app.ActionBar;
+
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 import static org.briarproject.briar.android.BriarApplication.ENTRY_ACTIVITY;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/threaded/BaseThreadItemViewHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/threaded/BaseThreadItemViewHolder.java
index a0f54bad3..ee31ff5e6 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/threaded/BaseThreadItemViewHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/threaded/BaseThreadItemViewHolder.java
@@ -4,9 +4,6 @@ import android.animation.Animator;
 import android.animation.ArgbEvaluator;
 import android.animation.ValueAnimator;
 import android.content.Context;
-import android.support.annotation.CallSuper;
-import android.support.annotation.UiThread;
-import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.animation.AccelerateInterpolator;
@@ -18,7 +15,11 @@ import org.briarproject.briar.R;
 import org.briarproject.briar.android.threaded.ThreadItemAdapter.ThreadItemListener;
 import org.briarproject.briar.android.view.AuthorView;
 
-import static android.support.v4.content.ContextCompat.getColor;
+import androidx.annotation.CallSuper;
+import androidx.annotation.UiThread;
+import androidx.recyclerview.widget.RecyclerView;
+
+import static androidx.core.content.ContextCompat.getColor;
 
 @UiThread
 @NotNullByDefault
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/threaded/NestedTreeList.java b/briar-android/src/main/java/org/briarproject/briar/android/threaded/NestedTreeList.java
index a8517b64b..40e211270 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/threaded/NestedTreeList.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/threaded/NestedTreeList.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.threaded;
 
-import android.support.annotation.UiThread;
-
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.briar.api.client.MessageTree;
@@ -13,6 +11,8 @@ import java.util.Collection;
 import java.util.Iterator;
 import java.util.List;
 
+import androidx.annotation.UiThread;
+
 @UiThread
 @NotNullByDefault
 public class NestedTreeList<T extends MessageNode> implements Iterable<T> {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadItemAdapter.java b/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadItemAdapter.java
index c9af77016..c293f7858 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadItemAdapter.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadItemAdapter.java
@@ -1,9 +1,5 @@
 package org.briarproject.briar.android.threaded;
 
-import android.support.annotation.NonNull;
-import android.support.annotation.UiThread;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -17,7 +13,12 @@ import java.util.Collection;
 
 import javax.annotation.Nullable;
 
-import static android.support.v7.widget.RecyclerView.NO_POSITION;
+import androidx.annotation.NonNull;
+import androidx.annotation.UiThread;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+
+import static androidx.recyclerview.widget.RecyclerView.NO_POSITION;
 
 @UiThread
 public class ThreadItemAdapter<I extends ThreadItem>
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadListActivity.java b/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadListActivity.java
index 8ae9dd4c0..b01248782 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadListActivity.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadListActivity.java
@@ -3,14 +3,10 @@ package org.briarproject.briar.android.threaded;
 import android.content.Intent;
 import android.os.Bundle;
 import android.os.Parcelable;
-import android.support.annotation.CallSuper;
-import android.support.annotation.StringRes;
-import android.support.annotation.UiThread;
-import android.support.design.widget.Snackbar;
-import android.support.v7.app.ActionBar;
-import android.support.v7.widget.LinearLayoutManager;
 import android.view.MenuItem;
 
+import com.google.android.material.snackbar.Snackbar;
+
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
@@ -41,7 +37,13 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
-import static android.support.v7.widget.RecyclerView.NO_POSITION;
+import androidx.annotation.CallSuper;
+import androidx.annotation.StringRes;
+import androidx.annotation.UiThread;
+import androidx.appcompat.app.ActionBar;
+import androidx.recyclerview.widget.LinearLayoutManager;
+
+import static androidx.recyclerview.widget.RecyclerView.NO_POSITION;
 import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
 
 @MethodsNotNullByDefault
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadListController.java b/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadListController.java
index bd7a4a0cb..f8eb71bed 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadListController.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadListController.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.threaded;
 
-import android.support.annotation.UiThread;
-
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
@@ -16,6 +14,8 @@ import java.util.Collection;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.UiThread;
+
 @NotNullByDefault
 public interface ThreadListController<G extends NamedGroup, I extends ThreadItem>
 		extends ActivityLifecycleController {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadListControllerImpl.java b/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadListControllerImpl.java
index 4ea148102..61eeb2a9e 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadListControllerImpl.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadListControllerImpl.java
@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.threaded;
 
 import android.app.Activity;
-import android.support.annotation.CallSuper;
 
 import org.briarproject.bramble.api.crypto.CryptoExecutor;
 import org.briarproject.bramble.api.db.DatabaseExecutor;
@@ -34,6 +33,8 @@ import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.Executor;
 import java.util.logging.Logger;
 
+import androidx.annotation.CallSuper;
+
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadPostViewHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadPostViewHolder.java
index afd1c2323..71c028b14 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadPostViewHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadPostViewHolder.java
@@ -1,6 +1,5 @@
 package org.briarproject.briar.android.threaded;
 
-import android.support.annotation.UiThread;
 import android.view.View;
 import android.widget.TextView;
 
@@ -10,6 +9,8 @@ import org.briarproject.briar.android.threaded.ThreadItemAdapter.ThreadItemListe
 
 import java.util.Locale;
 
+import androidx.annotation.UiThread;
+
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadScrollListener.java b/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadScrollListener.java
index e1748a0bc..2181d6de3 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadScrollListener.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadScrollListener.java
@@ -1,14 +1,14 @@
 package org.briarproject.briar.android.threaded;
 
-import android.support.v7.widget.LinearLayoutManager;
-
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.android.view.BriarRecyclerViewScrollListener;
 import org.briarproject.briar.android.view.UnreadMessageButton;
 
 import java.util.logging.Logger;
 
-import static android.support.v7.widget.RecyclerView.NO_POSITION;
+import androidx.recyclerview.widget.LinearLayoutManager;
+
+import static androidx.recyclerview.widget.RecyclerView.NO_POSITION;
 import static java.util.Objects.requireNonNull;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Logger.getLogger;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/util/BriarAdapter.java b/briar-android/src/main/java/org/briarproject/briar/android/util/BriarAdapter.java
index eb8276e19..62b4a741f 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/util/BriarAdapter.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/util/BriarAdapter.java
@@ -1,16 +1,17 @@
 package org.briarproject.briar.android.util;
 
 import android.content.Context;
-import android.support.annotation.UiThread;
-import android.support.v7.util.SortedList;
-import android.support.v7.widget.RecyclerView.Adapter;
-import android.support.v7.widget.RecyclerView.ViewHolder;
 
 import java.util.Collection;
 
 import javax.annotation.Nullable;
 
-import static android.support.v7.util.SortedList.INVALID_POSITION;
+import androidx.annotation.UiThread;
+import androidx.recyclerview.widget.RecyclerView.Adapter;
+import androidx.recyclerview.widget.RecyclerView.ViewHolder;
+import androidx.recyclerview.widget.SortedList;
+
+import static androidx.recyclerview.widget.SortedList.INVALID_POSITION;
 
 public abstract class BriarAdapter<T, V extends ViewHolder>
 		extends Adapter<V> implements VersionedAdapter {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/util/BriarNotificationBuilder.java b/briar-android/src/main/java/org/briarproject/briar/android/util/BriarNotificationBuilder.java
index cd6c6e4bd..7783dbe41 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/util/BriarNotificationBuilder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/util/BriarNotificationBuilder.java
@@ -1,14 +1,15 @@
 package org.briarproject.briar.android.util;
 
 import android.content.Context;
-import android.support.annotation.ColorRes;
-import android.support.v4.app.NotificationCompat;
-import android.support.v4.content.ContextCompat;
 
 import org.briarproject.briar.R;
 
+import androidx.annotation.ColorRes;
+import androidx.core.app.NotificationCompat;
+import androidx.core.content.ContextCompat;
+
 import static android.os.Build.VERSION.SDK_INT;
-import static android.support.v4.app.NotificationCompat.VISIBILITY_PRIVATE;
+import static androidx.core.app.NotificationCompat.VISIBILITY_PRIVATE;
 
 
 public class BriarNotificationBuilder extends NotificationCompat.Builder {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/util/BriarSnackbarBuilder.java b/briar-android/src/main/java/org/briarproject/briar/android/util/BriarSnackbarBuilder.java
index e5399c5a5..785befbeb 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/util/BriarSnackbarBuilder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/util/BriarSnackbarBuilder.java
@@ -1,21 +1,23 @@
 package org.briarproject.briar.android.util;
 
-import android.support.annotation.ColorRes;
-import android.support.annotation.Nullable;
-import android.support.annotation.StringRes;
-import android.support.design.widget.Snackbar;
-import android.support.design.widget.Snackbar.Callback;
 import android.view.View;
 import android.view.View.OnClickListener;
 
+import com.google.android.material.snackbar.Snackbar;
+import com.google.android.material.snackbar.Snackbar.Callback;
+
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 
+import androidx.annotation.ColorRes;
+import androidx.annotation.Nullable;
+import androidx.annotation.StringRes;
+
 import static android.os.Build.VERSION.SDK_INT;
-import static android.support.design.widget.Snackbar.LENGTH_INDEFINITE;
-import static android.support.v4.content.ContextCompat.getColor;
 import static android.view.View.INVISIBLE;
 import static android.view.View.VISIBLE;
+import static androidx.core.content.ContextCompat.getColor;
+import static com.google.android.material.snackbar.Snackbar.LENGTH_INDEFINITE;
 
 @NotNullByDefault
 public class BriarSnackbarBuilder {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/util/UiUtils.java b/briar-android/src/main/java/org/briarproject/briar/android/util/UiUtils.java
index 0e6856615..83d59dddd 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/util/UiUtils.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/util/UiUtils.java
@@ -3,25 +3,11 @@ package org.briarproject.briar.android.util;
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.app.KeyguardManager;
-import android.arch.lifecycle.LifecycleOwner;
-import android.arch.lifecycle.LiveData;
-import android.arch.lifecycle.Observer;
 import android.content.Context;
 import android.content.DialogInterface.OnClickListener;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.PowerManager;
-import android.support.annotation.AttrRes;
-import android.support.annotation.ColorInt;
-import android.support.annotation.ColorRes;
-import android.support.annotation.Nullable;
-import android.support.annotation.RequiresApi;
-import android.support.annotation.UiThread;
-import android.support.design.widget.TextInputLayout;
-import android.support.v4.app.FragmentManager;
-import android.support.v4.content.ContextCompat;
-import android.support.v4.hardware.fingerprint.FingerprintManagerCompat;
-import android.support.v7.app.AlertDialog;
 import android.text.Html;
 import android.text.Spannable;
 import android.text.SpannableString;
@@ -39,6 +25,8 @@ import android.view.View;
 import android.view.inputmethod.InputMethodManager;
 import android.widget.TextView;
 
+import com.google.android.material.textfield.TextInputLayout;
+
 import org.acra.ACRA;
 import org.briarproject.bramble.api.contact.Contact;
 import org.briarproject.bramble.api.contact.ContactId;
@@ -50,6 +38,20 @@ import org.briarproject.briar.R;
 import org.briarproject.briar.android.view.ArticleMovementMethod;
 import org.briarproject.briar.android.widget.LinkDialogFragment;
 
+import androidx.annotation.AttrRes;
+import androidx.annotation.ColorInt;
+import androidx.annotation.ColorRes;
+import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
+import androidx.annotation.UiThread;
+import androidx.appcompat.app.AlertDialog;
+import androidx.core.content.ContextCompat;
+import androidx.core.hardware.fingerprint.FingerprintManagerCompat;
+import androidx.fragment.app.FragmentManager;
+import androidx.lifecycle.LifecycleOwner;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.Observer;
+
 import static android.content.Context.KEYGUARD_SERVICE;
 import static android.content.Context.POWER_SERVICE;
 import static android.content.Intent.CATEGORY_DEFAULT;
@@ -57,13 +59,6 @@ import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
 import static android.os.Build.MANUFACTURER;
 import static android.os.Build.VERSION.SDK_INT;
 import static android.provider.Settings.ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS;
-import static android.support.v4.content.ContextCompat.getSystemService;
-import static android.support.v4.view.ViewCompat.LAYOUT_DIRECTION_RTL;
-import static android.support.v7.app.AppCompatDelegate.MODE_NIGHT_AUTO;
-import static android.support.v7.app.AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM;
-import static android.support.v7.app.AppCompatDelegate.MODE_NIGHT_NO;
-import static android.support.v7.app.AppCompatDelegate.MODE_NIGHT_YES;
-import static android.support.v7.app.AppCompatDelegate.setDefaultNightMode;
 import static android.text.format.DateUtils.DAY_IN_MILLIS;
 import static android.text.format.DateUtils.FORMAT_ABBREV_ALL;
 import static android.text.format.DateUtils.FORMAT_ABBREV_MONTH;
@@ -79,6 +74,13 @@ import static android.view.KeyEvent.ACTION_DOWN;
 import static android.view.KeyEvent.KEYCODE_ENTER;
 import static android.view.inputmethod.EditorInfo.IME_NULL;
 import static android.view.inputmethod.InputMethodManager.SHOW_IMPLICIT;
+import static androidx.appcompat.app.AppCompatDelegate.MODE_NIGHT_AUTO_TIME;
+import static androidx.appcompat.app.AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM;
+import static androidx.appcompat.app.AppCompatDelegate.MODE_NIGHT_NO;
+import static androidx.appcompat.app.AppCompatDelegate.MODE_NIGHT_YES;
+import static androidx.appcompat.app.AppCompatDelegate.setDefaultNightMode;
+import static androidx.core.content.ContextCompat.getSystemService;
+import static androidx.core.view.ViewCompat.LAYOUT_DIRECTION_RTL;
 import static java.util.Objects.requireNonNull;
 import static java.util.concurrent.TimeUnit.DAYS;
 import static org.briarproject.briar.BuildConfig.APPLICATION_ID;
@@ -297,7 +299,8 @@ public class UiUtils {
 			setDefaultNightMode(MODE_NIGHT_YES);
 		} else if (theme
 				.equals(ctx.getString(R.string.pref_theme_auto_value))) {
-			setDefaultNightMode(MODE_NIGHT_AUTO);
+			// TODO remove AUTO-setting as it is deprecated
+			setDefaultNightMode(MODE_NIGHT_AUTO_TIME);
 		} else if (theme
 				.equals(ctx.getString(R.string.pref_theme_system_value))) {
 			setDefaultNightMode(MODE_NIGHT_FOLLOW_SYSTEM);
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/util/VersionedAdapter.java b/briar-android/src/main/java/org/briarproject/briar/android/util/VersionedAdapter.java
index de900512b..de657275d 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/util/VersionedAdapter.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/util/VersionedAdapter.java
@@ -1,6 +1,6 @@
 package org.briarproject.briar.android.util;
 
-import android.support.annotation.UiThread;
+import androidx.annotation.UiThread;
 
 public interface VersionedAdapter {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/AuthorView.java b/briar-android/src/main/java/org/briarproject/briar/android/view/AuthorView.java
index 86994db22..61de039ee 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/AuthorView.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/AuthorView.java
@@ -3,9 +3,6 @@ package org.briarproject.briar.android.view;
 import android.content.Context;
 import android.content.res.TypedArray;
 import android.graphics.Typeface;
-import android.support.annotation.DimenRes;
-import android.support.annotation.UiThread;
-import android.support.constraint.ConstraintLayout;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
 import android.widget.ImageView;
@@ -18,6 +15,9 @@ import org.briarproject.briar.android.util.UiUtils;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.DimenRes;
+import androidx.annotation.UiThread;
+import androidx.constraintlayout.widget.ConstraintLayout;
 import de.hdodenhof.circleimageview.CircleImageView;
 import im.delight.android.identicons.IdenticonDrawable;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/BriarRecyclerView.java b/briar-android/src/main/java/org/briarproject/briar/android/view/BriarRecyclerView.java
index 9c203a0e8..4dc6c6b3a 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/BriarRecyclerView.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/BriarRecyclerView.java
@@ -5,11 +5,6 @@ import android.content.res.TypedArray;
 import android.graphics.drawable.Drawable;
 import android.os.Handler;
 import android.os.Looper;
-import android.support.annotation.DrawableRes;
-import android.support.annotation.StringRes;
-import android.support.v7.widget.AppCompatImageView;
-import android.support.v7.widget.RecyclerView;
-import android.support.v7.widget.RecyclerView.Adapter;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -21,6 +16,12 @@ import org.briarproject.briar.R;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.DrawableRes;
+import androidx.annotation.StringRes;
+import androidx.appcompat.widget.AppCompatImageView;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView.Adapter;
+
 import static org.briarproject.briar.android.util.UiUtils.MIN_DATE_RESOLUTION;
 
 public class BriarRecyclerView extends FrameLayout {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/BriarRecyclerViewScrollListener.java b/briar-android/src/main/java/org/briarproject/briar/android/view/BriarRecyclerViewScrollListener.java
index a80876e6a..7c23c894b 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/BriarRecyclerViewScrollListener.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/BriarRecyclerViewScrollListener.java
@@ -1,14 +1,14 @@
 package org.briarproject.briar.android.view;
 
-import android.support.annotation.CallSuper;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.RecyclerView;
-import android.support.v7.widget.RecyclerView.OnScrollListener;
-
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.android.util.ItemReturningAdapter;
 
-import static android.support.v7.widget.RecyclerView.NO_POSITION;
+import androidx.annotation.CallSuper;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView.OnScrollListener;
+
+import static androidx.recyclerview.widget.RecyclerView.NO_POSITION;
 import static java.util.Objects.requireNonNull;
 
 @NotNullByDefault
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/CompositeSendButton.java b/briar-android/src/main/java/org/briarproject/briar/android/view/CompositeSendButton.java
index 60b2b8e62..273a250c5 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/CompositeSendButton.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/CompositeSendButton.java
@@ -1,9 +1,6 @@
 package org.briarproject.briar.android.view;
 
 import android.content.Context;
-import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
-import android.support.v7.widget.AppCompatImageButton;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -12,6 +9,10 @@ import android.widget.ProgressBar;
 
 import org.briarproject.briar.R;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.widget.AppCompatImageButton;
+
 import static android.content.Context.LAYOUT_INFLATER_SERVICE;
 import static java.util.Objects.requireNonNull;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/EmojiTextInputView.java b/briar-android/src/main/java/org/briarproject/briar/android/view/EmojiTextInputView.java
index 66deb1acb..a3393213c 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/EmojiTextInputView.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/EmojiTextInputView.java
@@ -4,9 +4,6 @@ import android.content.Context;
 import android.content.res.TypedArray;
 import android.graphics.Rect;
 import android.os.IBinder;
-import android.support.annotation.Nullable;
-import android.support.annotation.StringRes;
-import android.support.v7.widget.AppCompatImageButton;
 import android.text.Editable;
 import android.text.TextWatcher;
 import android.util.AttributeSet;
@@ -23,6 +20,10 @@ import org.briarproject.briar.android.BriarApplication;
 
 import javax.inject.Inject;
 
+import androidx.annotation.Nullable;
+import androidx.annotation.StringRes;
+import androidx.appcompat.widget.AppCompatImageButton;
+
 import static android.content.Context.INPUT_METHOD_SERVICE;
 import static android.content.Context.LAYOUT_INFLATER_SERVICE;
 import static android.view.KeyEvent.KEYCODE_ENTER;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreview.java b/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreview.java
index 7bdb7d93f..cb379b3d3 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreview.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreview.java
@@ -1,9 +1,6 @@
 package org.briarproject.briar.android.view;
 
 import android.content.Context;
-import android.support.annotation.Nullable;
-import android.support.constraint.ConstraintLayout;
-import android.support.v7.widget.RecyclerView;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
 
@@ -13,10 +10,14 @@ import org.briarproject.briar.android.attachment.AttachmentItemResult;
 
 import java.util.Collection;
 
+import androidx.annotation.Nullable;
+import androidx.constraintlayout.widget.ConstraintLayout;
+import androidx.recyclerview.widget.RecyclerView;
+
 import static android.content.Context.LAYOUT_INFLATER_SERVICE;
-import static android.support.v4.content.ContextCompat.getColor;
-import static android.support.v7.widget.RecyclerView.NO_POSITION;
 import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
+import static androidx.core.content.ContextCompat.getColor;
+import static androidx.recyclerview.widget.RecyclerView.NO_POSITION;
 import static java.util.Objects.requireNonNull;
 
 @NotNullByDefault
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreviewAdapter.java b/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreviewAdapter.java
index 5e7bf3253..c11a70363 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreviewAdapter.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreviewAdapter.java
@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.view;
 
-import android.support.annotation.LayoutRes;
-import android.support.v7.widget.RecyclerView.Adapter;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -14,7 +12,10 @@ import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 
-import static android.support.v7.widget.RecyclerView.NO_POSITION;
+import androidx.annotation.LayoutRes;
+import androidx.recyclerview.widget.RecyclerView.Adapter;
+
+import static androidx.recyclerview.widget.RecyclerView.NO_POSITION;
 import static java.util.Objects.requireNonNull;
 
 @NotNullByDefault
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreviewDecoration.java b/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreviewDecoration.java
index 5c14ab760..ea4893ed7 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreviewDecoration.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreviewDecoration.java
@@ -3,14 +3,15 @@ package org.briarproject.briar.android.view;
 import android.content.Context;
 import android.content.res.Resources;
 import android.graphics.Rect;
-import android.support.v7.widget.RecyclerView;
-import android.support.v7.widget.RecyclerView.ItemDecoration;
-import android.support.v7.widget.RecyclerView.State;
 import android.view.View;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView.ItemDecoration;
+import androidx.recyclerview.widget.RecyclerView.State;
+
 @NotNullByDefault
 class ImagePreviewDecoration extends ItemDecoration {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreviewItem.java b/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreviewItem.java
index 5a4f24648..004b5fd48 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreviewItem.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreviewItem.java
@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.view;
 
 import android.net.Uri;
-import android.support.annotation.Nullable;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.android.attachment.AttachmentItem;
@@ -10,6 +9,8 @@ import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 
+import androidx.annotation.Nullable;
+
 @NotNullByDefault
 class ImagePreviewItem {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreviewViewHolder.java b/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreviewViewHolder.java
index 856eb30bb..f78c4f9fc 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreviewViewHolder.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/ImagePreviewViewHolder.java
@@ -1,9 +1,6 @@
 package org.briarproject.briar.android.view;
 
 import android.graphics.drawable.Drawable;
-import android.support.annotation.DrawableRes;
-import android.support.annotation.Nullable;
-import android.support.v7.widget.RecyclerView.ViewHolder;
 import android.view.View;
 import android.widget.ImageView;
 import android.widget.ProgressBar;
@@ -17,6 +14,10 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.conversation.glide.GlideApp;
 
+import androidx.annotation.DrawableRes;
+import androidx.annotation.Nullable;
+import androidx.recyclerview.widget.RecyclerView.ViewHolder;
+
 import static android.view.View.INVISIBLE;
 import static android.view.View.VISIBLE;
 import static com.bumptech.glide.load.engine.DiskCacheStrategy.NONE;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/LargeTextInputView.java b/briar-android/src/main/java/org/briarproject/briar/android/view/LargeTextInputView.java
index df55d6807..d3f34fa4f 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/LargeTextInputView.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/LargeTextInputView.java
@@ -2,7 +2,6 @@ package org.briarproject.briar.android.view;
 
 import android.content.Context;
 import android.content.res.TypedArray;
-import android.support.annotation.UiThread;
 import android.util.AttributeSet;
 import android.view.ViewGroup;
 import android.widget.Button;
@@ -13,6 +12,8 @@ import org.briarproject.briar.R;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.UiThread;
+
 import static android.view.Gravity.BOTTOM;
 import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/PullDownLayout.java b/briar-android/src/main/java/org/briarproject/briar/android/view/PullDownLayout.java
index a32659a07..8050438e3 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/PullDownLayout.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/PullDownLayout.java
@@ -25,9 +25,6 @@
 package org.briarproject.briar.android.view;
 
 import android.content.Context;
-import android.support.annotation.Nullable;
-import android.support.v4.view.ViewCompat;
-import android.support.v4.widget.ViewDragHelper;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
 import android.view.View;
@@ -36,6 +33,10 @@ import android.widget.FrameLayout;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
+import androidx.annotation.Nullable;
+import androidx.core.view.ViewCompat;
+import androidx.customview.widget.ViewDragHelper;
+
 @NotNullByDefault
 public class PullDownLayout extends FrameLayout {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/QrCodeView.java b/briar-android/src/main/java/org/briarproject/briar/android/view/QrCodeView.java
index 37a9f206a..008f9ab5f 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/QrCodeView.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/QrCodeView.java
@@ -2,9 +2,6 @@ package org.briarproject.briar.android.view;
 
 import android.content.Context;
 import android.graphics.Bitmap;
-import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
-import android.support.annotation.UiThread;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
 import android.view.animation.AlphaAnimation;
@@ -13,6 +10,10 @@ import android.widget.ImageView;
 
 import org.briarproject.briar.R;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.UiThread;
+
 public class QrCodeView extends FrameLayout {
 
     private final ImageView qrCodeImageView;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/SnackbarAwareBehavior.java b/briar-android/src/main/java/org/briarproject/briar/android/view/SnackbarAwareBehavior.java
index 75853e5a0..7444c9557 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/SnackbarAwareBehavior.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/SnackbarAwareBehavior.java
@@ -1,15 +1,17 @@
 package org.briarproject.briar.android.view;
 
 import android.content.Context;
-import android.support.design.widget.CoordinatorLayout;
-import android.support.design.widget.CoordinatorLayout.Behavior;
-import android.support.design.widget.CoordinatorLayout.LayoutParams;
-import android.support.design.widget.Snackbar.SnackbarLayout;
 import android.util.AttributeSet;
 import android.view.View;
 
+import com.google.android.material.snackbar.Snackbar.SnackbarLayout;
+
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
+import androidx.coordinatorlayout.widget.CoordinatorLayout;
+import androidx.coordinatorlayout.widget.CoordinatorLayout.Behavior;
+import androidx.coordinatorlayout.widget.CoordinatorLayout.LayoutParams;
+
 /**
  * This behavior makes room for a snackbar at the bottom of the screen. The
  * proper solution is to use layout_dodgeInsetEdges="bottom", but when used on
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/TextAttachmentController.java b/briar-android/src/main/java/org/briarproject/briar/android/view/TextAttachmentController.java
index e2b89bdc1..fcf3e3981 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/TextAttachmentController.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/TextAttachmentController.java
@@ -1,19 +1,12 @@
 package org.briarproject.briar.android.view;
 
 import android.app.Activity;
-import android.arch.lifecycle.LifecycleOwner;
-import android.arch.lifecycle.LiveData;
-import android.arch.lifecycle.Observer;
 import android.content.ClipData;
 import android.content.Context;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.Parcel;
 import android.os.Parcelable;
-import android.support.annotation.Nullable;
-import android.support.annotation.UiThread;
-import android.support.v4.view.AbsSavedState;
-import android.support.v7.app.AlertDialog.Builder;
 import android.widget.Toast;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
@@ -27,19 +20,26 @@ import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 
+import androidx.annotation.Nullable;
+import androidx.annotation.UiThread;
+import androidx.appcompat.app.AlertDialog.Builder;
+import androidx.customview.view.AbsSavedState;
+import androidx.lifecycle.LifecycleOwner;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.Observer;
 import uk.co.samuelwall.materialtaptargetprompt.MaterialTapTargetPrompt;
 
-import static android.arch.lifecycle.Lifecycle.State.DESTROYED;
 import static android.content.Intent.ACTION_GET_CONTENT;
 import static android.content.Intent.ACTION_OPEN_DOCUMENT;
 import static android.content.Intent.CATEGORY_OPENABLE;
 import static android.content.Intent.EXTRA_ALLOW_MULTIPLE;
 import static android.content.Intent.EXTRA_MIME_TYPES;
 import static android.os.Build.VERSION.SDK_INT;
-import static android.support.v4.content.ContextCompat.getColor;
-import static android.support.v4.view.AbsSavedState.EMPTY_STATE;
 import static android.view.View.GONE;
 import static android.widget.Toast.LENGTH_LONG;
+import static androidx.core.content.ContextCompat.getColor;
+import static androidx.customview.view.AbsSavedState.EMPTY_STATE;
+import static androidx.lifecycle.Lifecycle.State.DESTROYED;
 import static org.briarproject.briar.android.util.UiUtils.resolveColorAttribute;
 import static org.briarproject.briar.api.messaging.MessagingConstants.IMAGE_MIME_TYPES;
 import static org.briarproject.briar.api.messaging.MessagingConstants.MAX_ATTACHMENTS_PER_MESSAGE;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/TextAvatarView.java b/briar-android/src/main/java/org/briarproject/briar/android/view/TextAvatarView.java
index d075d41db..3c4b9d1d9 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/TextAvatarView.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/TextAvatarView.java
@@ -3,8 +3,6 @@ package org.briarproject.briar.android.view;
 import android.content.Context;
 import android.graphics.Color;
 import android.graphics.drawable.ColorDrawable;
-import android.support.annotation.UiThread;
-import android.support.v7.widget.AppCompatTextView;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
 import android.widget.FrameLayout;
@@ -16,6 +14,8 @@ import java.util.Locale;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.UiThread;
+import androidx.appcompat.widget.AppCompatTextView;
 import de.hdodenhof.circleimageview.CircleImageView;
 
 @UiThread
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/TextInputView.java b/briar-android/src/main/java/org/briarproject/briar/android/view/TextInputView.java
index 1fbb4301d..18c7521ba 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/TextInputView.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/TextInputView.java
@@ -5,10 +5,6 @@ import android.content.Context;
 import android.content.res.TypedArray;
 import android.graphics.Rect;
 import android.os.Parcelable;
-import android.support.annotation.LayoutRes;
-import android.support.annotation.Nullable;
-import android.support.annotation.StringRes;
-import android.support.annotation.UiThread;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
 import android.widget.LinearLayout;
@@ -18,6 +14,11 @@ import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.view.EmojiTextInputView.OnKeyboardShownListener;
 
+import androidx.annotation.LayoutRes;
+import androidx.annotation.Nullable;
+import androidx.annotation.StringRes;
+import androidx.annotation.UiThread;
+
 import static android.content.Context.LAYOUT_INFLATER_SERVICE;
 import static java.util.Objects.requireNonNull;
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/TextSendController.java b/briar-android/src/main/java/org/briarproject/briar/android/view/TextSendController.java
index 180039f0a..ae2ac2313 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/TextSendController.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/TextSendController.java
@@ -1,11 +1,10 @@
 package org.briarproject.briar.android.view;
 
 import android.os.Parcelable;
-import android.support.annotation.Nullable;
-import android.support.annotation.UiThread;
-import android.support.design.widget.Snackbar;
 import android.view.View;
 
+import com.google.android.material.snackbar.Snackbar;
+
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.view.EmojiTextInputView.TextInputListener;
@@ -13,7 +12,10 @@ import org.briarproject.briar.api.messaging.AttachmentHeader;
 
 import java.util.List;
 
-import static android.support.design.widget.Snackbar.LENGTH_SHORT;
+import androidx.annotation.Nullable;
+import androidx.annotation.UiThread;
+
+import static com.google.android.material.snackbar.Snackbar.LENGTH_SHORT;
 import static java.util.Collections.emptyList;
 
 @UiThread
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/TrustIndicatorView.java b/briar-android/src/main/java/org/briarproject/briar/android/view/TrustIndicatorView.java
index aa3c78c50..fb045db00 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/TrustIndicatorView.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/TrustIndicatorView.java
@@ -1,14 +1,15 @@
 package org.briarproject.briar.android.view;
 
 import android.content.Context;
-import android.support.annotation.UiThread;
-import android.support.v4.content.ContextCompat;
-import android.support.v7.widget.AppCompatImageView;
 import android.util.AttributeSet;
 
 import org.briarproject.bramble.api.identity.AuthorInfo.Status;
 import org.briarproject.briar.R;
 
+import androidx.annotation.UiThread;
+import androidx.appcompat.widget.AppCompatImageView;
+import androidx.core.content.ContextCompat;
+
 @UiThread
 public class TrustIndicatorView extends AppCompatImageView {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/view/UnreadMessageButton.java b/briar-android/src/main/java/org/briarproject/briar/android/view/UnreadMessageButton.java
index 94daa915b..24a1df1c4 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/view/UnreadMessageButton.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/view/UnreadMessageButton.java
@@ -2,13 +2,13 @@ package org.briarproject.briar.android.view;
 
 import android.content.Context;
 import android.content.res.TypedArray;
-import android.support.annotation.UiThread;
-import android.support.design.widget.FloatingActionButton;
 import android.util.AttributeSet;
 import android.view.LayoutInflater;
 import android.widget.FrameLayout;
 import android.widget.TextView;
 
+import com.google.android.material.floatingactionbutton.FloatingActionButton;
+
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 
@@ -16,6 +16,8 @@ import java.util.Locale;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.UiThread;
+
 @UiThread
 @NotNullByDefault
 public class UnreadMessageButton extends FrameLayout {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/LiveEvent.java b/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/LiveEvent.java
index ccb1e1ada..d7ff0cef5 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/LiveEvent.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/LiveEvent.java
@@ -1,14 +1,14 @@
 package org.briarproject.briar.android.viewmodel;
 
-import android.arch.lifecycle.LifecycleOwner;
-import android.arch.lifecycle.LiveData;
-import android.arch.lifecycle.Observer;
-import android.support.annotation.Nullable;
-
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
 import javax.annotation.concurrent.Immutable;
 
+import androidx.annotation.Nullable;
+import androidx.lifecycle.LifecycleOwner;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.Observer;
+
 @NotNullByDefault
 public class LiveEvent<T> extends LiveData<LiveEvent.ConsumableEvent<T>> {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/LiveResult.java b/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/LiveResult.java
index 661d2d722..2d2d09da6 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/LiveResult.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/LiveResult.java
@@ -1,9 +1,9 @@
 package org.briarproject.briar.android.viewmodel;
 
-import android.support.annotation.Nullable;
-
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
+import androidx.annotation.Nullable;
+
 @NotNullByDefault
 public class LiveResult<T> {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/ViewModelFactory.java b/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/ViewModelFactory.java
index f35670625..19ee29469 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/ViewModelFactory.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/ViewModelFactory.java
@@ -15,9 +15,6 @@
  */
 package org.briarproject.briar.android.viewmodel;
 
-import android.arch.lifecycle.ViewModel;
-import android.arch.lifecycle.ViewModelProvider;
-
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
 import java.util.Map;
@@ -27,6 +24,9 @@ import javax.inject.Inject;
 import javax.inject.Provider;
 import javax.inject.Singleton;
 
+import androidx.lifecycle.ViewModel;
+import androidx.lifecycle.ViewModelProvider;
+
 @Singleton
 @NotNullByDefault
 class ViewModelFactory implements ViewModelProvider.Factory {
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/ViewModelKey.java b/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/ViewModelKey.java
index 66288e9bb..bf1a27382 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/ViewModelKey.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/ViewModelKey.java
@@ -1,13 +1,12 @@
 package org.briarproject.briar.android.viewmodel;
 
-import android.arch.lifecycle.ViewModel;
-
 import java.lang.annotation.Documented;
 import java.lang.annotation.ElementType;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
+import androidx.lifecycle.ViewModel;
 import dagger.MapKey;
 
 @Documented
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/ViewModelModule.java b/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/ViewModelModule.java
index 86864b692..4e4c9bb4c 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/ViewModelModule.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/viewmodel/ViewModelModule.java
@@ -1,8 +1,5 @@
 package org.briarproject.briar.android.viewmodel;
 
-import android.arch.lifecycle.ViewModel;
-import android.arch.lifecycle.ViewModelProvider;
-
 import org.briarproject.briar.android.contact.add.remote.AddContactViewModel;
 import org.briarproject.briar.android.contact.add.remote.PendingContactListViewModel;
 import org.briarproject.briar.android.conversation.ConversationViewModel;
@@ -11,6 +8,8 @@ import org.briarproject.briar.android.login.StartupViewModel;
 
 import javax.inject.Singleton;
 
+import androidx.lifecycle.ViewModel;
+import androidx.lifecycle.ViewModelProvider;
 import dagger.Binds;
 import dagger.Module;
 import dagger.multibindings.IntoMap;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/widget/LinkDialogFragment.java b/briar-android/src/main/java/org/briarproject/briar/android/widget/LinkDialogFragment.java
index c5fd86c8d..b07cc07fe 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/widget/LinkDialogFragment.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/widget/LinkDialogFragment.java
@@ -5,8 +5,6 @@ import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.net.Uri;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.v4.app.DialogFragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -19,6 +17,9 @@ import org.briarproject.briar.R;
 
 import java.util.List;
 
+import androidx.annotation.Nullable;
+import androidx.fragment.app.DialogFragment;
+
 import static android.content.Intent.ACTION_VIEW;
 import static android.content.pm.PackageManager.MATCH_DEFAULT_ONLY;
 import static java.util.Objects.requireNonNull;
diff --git a/briar-android/src/main/java/org/briarproject/briar/android/widget/TapSafeFrameLayout.java b/briar-android/src/main/java/org/briarproject/briar/android/widget/TapSafeFrameLayout.java
index 6d285682f..9215b75dc 100644
--- a/briar-android/src/main/java/org/briarproject/briar/android/widget/TapSafeFrameLayout.java
+++ b/briar-android/src/main/java/org/briarproject/briar/android/widget/TapSafeFrameLayout.java
@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.widget;
 
 import android.content.Context;
-import android.support.annotation.AttrRes;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
 import android.widget.FrameLayout;
@@ -11,6 +10,8 @@ import org.briarproject.briar.android.util.UiUtils;
 
 import javax.annotation.Nullable;
 
+import androidx.annotation.AttrRes;
+
 import static android.view.MotionEvent.FLAG_WINDOW_IS_OBSCURED;
 
 @NotNullByDefault
diff --git a/briar-android/src/main/java/org/briarproject/briar/api/android/LockManager.java b/briar-android/src/main/java/org/briarproject/briar/api/android/LockManager.java
index d4255abb7..d8e4b4148 100644
--- a/briar-android/src/main/java/org/briarproject/briar/api/android/LockManager.java
+++ b/briar-android/src/main/java/org/briarproject/briar/api/android/LockManager.java
@@ -1,8 +1,9 @@
 package org.briarproject.briar.api.android;
 
 import android.app.Activity;
-import android.arch.lifecycle.LiveData;
-import android.support.annotation.UiThread;
+
+import androidx.annotation.UiThread;
+import androidx.lifecycle.LiveData;
 
 public interface LockManager {
 
diff --git a/briar-android/src/main/java/org/briarproject/briar/api/android/ScreenFilterMonitor.java b/briar-android/src/main/java/org/briarproject/briar/api/android/ScreenFilterMonitor.java
index a14b3b078..b9abd669c 100644
--- a/briar-android/src/main/java/org/briarproject/briar/api/android/ScreenFilterMonitor.java
+++ b/briar-android/src/main/java/org/briarproject/briar/api/android/ScreenFilterMonitor.java
@@ -1,11 +1,11 @@
 package org.briarproject.briar.api.android;
 
-import android.support.annotation.UiThread;
-
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
 import java.util.Collection;
 
+import androidx.annotation.UiThread;
+
 @NotNullByDefault
 public interface ScreenFilterMonitor {
 
diff --git a/briar-android/src/main/res/layout-land/fragment_keyagreement_id.xml b/briar-android/src/main/res/layout-land/fragment_keyagreement_id.xml
index b7c0714ca..1f62190f1 100644
--- a/briar-android/src/main/res/layout-land/fragment_keyagreement_id.xml
+++ b/briar-android/src/main/res/layout-land/fragment_keyagreement_id.xml
@@ -8,7 +8,7 @@
 	android:layout_height="wrap_content"
 	android:orientation="vertical">
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
 		android:padding="@dimen/margin_large">
@@ -67,7 +67,7 @@
 			app:layout_constraintStart_toStartOf="@id/explanationImage"
 			app:layout_constraintTop_toTopOf="@id/explanationImage"/>
 
-		<android.support.constraint.Barrier
+		<androidx.constraintlayout.widget.Barrier
 			android:id="@+id/barrier"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
@@ -85,6 +85,6 @@
 			app:layout_constraintBottom_toBottomOf="parent"
 			app:layout_constraintTop_toBottomOf="@id/barrier"/>
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 
 </ScrollView>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/activity_change_password.xml b/briar-android/src/main/res/layout/activity_change_password.xml
index 94cdff0fb..1737eb331 100644
--- a/briar-android/src/main/res/layout/activity_change_password.xml
+++ b/briar-android/src/main/res/layout/activity_change_password.xml
@@ -1,24 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	tools:context=".android.login.ChangePasswordActivity">
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
 		android:orientation="vertical"
-		android:paddingBottom="@dimen/margin_activity_vertical"
-		android:paddingEnd="@dimen/margin_activity_horizontal"
-		android:paddingLeft="@dimen/margin_activity_horizontal"
-		android:paddingRight="@dimen/margin_activity_horizontal"
 		android:paddingStart="@dimen/margin_activity_horizontal"
-		android:paddingTop="@dimen/margin_activity_vertical">
+		android:paddingLeft="@dimen/margin_activity_horizontal"
+		android:paddingTop="@dimen/margin_activity_vertical"
+		android:paddingEnd="@dimen/margin_activity_horizontal"
+		android:paddingRight="@dimen/margin_activity_horizontal"
+		android:paddingBottom="@dimen/margin_activity_vertical">
 
-		<android.support.design.widget.TextInputLayout
+		<com.google.android.material.textfield.TextInputLayout
 			android:id="@+id/current_password_entry_wrapper"
 			android:layout_width="match_parent"
 			android:layout_height="wrap_content"
@@ -29,20 +28,20 @@
 			app:layout_constraintTop_toTopOf="parent"
 			app:passwordToggleEnabled="true">
 
-			<android.support.design.widget.TextInputEditText
+			<com.google.android.material.textfield.TextInputEditText
 				android:id="@+id/current_password_entry"
 				android:layout_width="match_parent"
 				android:layout_height="wrap_content"
 				android:hint="@string/current_password"
 				android:importantForAutofill="no"
 				android:inputType="textPassword"
-				android:maxLines="1"/>
+				android:maxLines="1" />
 
-			<requestFocus/>
+			<requestFocus />
 
-		</android.support.design.widget.TextInputLayout>
+		</com.google.android.material.textfield.TextInputLayout>
 
-		<android.support.design.widget.TextInputLayout
+		<com.google.android.material.textfield.TextInputLayout
 			android:id="@+id/new_password_entry_wrapper"
 			android:layout_width="match_parent"
 			android:layout_height="wrap_content"
@@ -53,17 +52,17 @@
 			app:layout_constraintTop_toBottomOf="@id/current_password_entry_wrapper"
 			app:passwordToggleEnabled="true">
 
-			<android.support.design.widget.TextInputEditText
+			<com.google.android.material.textfield.TextInputEditText
 				android:id="@+id/new_password_entry"
 				android:layout_width="match_parent"
 				android:layout_height="wrap_content"
 				android:hint="@string/choose_new_password"
 				android:importantForAutofill="no"
 				android:inputType="textPassword"
-				android:maxLines="1"/>
-		</android.support.design.widget.TextInputLayout>
+				android:maxLines="1" />
+		</com.google.android.material.textfield.TextInputLayout>
 
-		<android.support.design.widget.TextInputLayout
+		<com.google.android.material.textfield.TextInputLayout
 			android:id="@+id/new_password_confirm_wrapper"
 			android:layout_width="match_parent"
 			android:layout_height="wrap_content"
@@ -74,7 +73,7 @@
 			app:layout_constraintTop_toBottomOf="@id/new_password_entry_wrapper"
 			app:passwordToggleEnabled="true">
 
-			<android.support.design.widget.TextInputEditText
+			<com.google.android.material.textfield.TextInputEditText
 				android:id="@+id/new_password_confirm"
 				android:layout_width="match_parent"
 				android:layout_height="wrap_content"
@@ -82,8 +81,8 @@
 				android:imeOptions="actionDone"
 				android:importantForAutofill="no"
 				android:inputType="textPassword"
-				android:maxLines="1"/>
-		</android.support.design.widget.TextInputLayout>
+				android:maxLines="1" />
+		</com.google.android.material.textfield.TextInputLayout>
 
 		<org.briarproject.briar.android.login.StrengthMeter
 			android:id="@+id/strength_meter"
@@ -92,7 +91,7 @@
 			android:visibility="invisible"
 			app:layout_constraintLeft_toLeftOf="parent"
 			app:layout_constraintRight_toRightOf="parent"
-			app:layout_constraintTop_toBottomOf="@id/new_password_confirm_wrapper"/>
+			app:layout_constraintTop_toBottomOf="@id/new_password_confirm_wrapper" />
 
 		<Button
 			android:id="@+id/change_password"
@@ -105,7 +104,7 @@
 			app:layout_constraintLeft_toLeftOf="parent"
 			app:layout_constraintRight_toRightOf="parent"
 			app:layout_constraintTop_toBottomOf="@id/strength_meter"
-			tools:enabled="true"/>
+			tools:enabled="true" />
 
 		<ProgressBar
 			android:id="@+id/progress_wheel"
@@ -114,8 +113,8 @@
 			android:visibility="invisible"
 			app:layout_constraintLeft_toLeftOf="parent"
 			app:layout_constraintRight_toRightOf="parent"
-			app:layout_constraintTop_toTopOf="@id/change_password"/>
+			app:layout_constraintTop_toTopOf="@id/change_password" />
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 
-</ScrollView>
\ No newline at end of file
+</ScrollView>
diff --git a/briar-android/src/main/res/layout/activity_conversation.xml b/briar-android/src/main/res/layout/activity_conversation.xml
index d03850dee..b2908bcf6 100644
--- a/briar-android/src/main/res/layout/activity_conversation.xml
+++ b/briar-android/src/main/res/layout/activity_conversation.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -9,11 +8,11 @@
 	android:orientation="vertical"
 	tools:context=".android.conversation.ConversationActivity">
 
-	<android.support.design.widget.AppBarLayout
+	<com.google.android.material.appbar.AppBarLayout
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content">
 
-		<android.support.v7.widget.Toolbar
+		<androidx.appcompat.widget.Toolbar
 			android:id="@+id/toolbar"
 			style="@style/BriarToolbar"
 			android:layout_width="match_parent"
@@ -24,33 +23,33 @@
 				android:layout_height="match_parent"
 				android:orientation="horizontal">
 
-				<include layout="@layout/contact_avatar_status"/>
+				<include layout="@layout/contact_avatar_status" />
 
 				<com.vanniktech.emoji.EmojiTextView
 					android:id="@+id/contactName"
 					style="@style/TextAppearance.AppCompat.Widget.ActionBar.Title.Inverse"
 					android:layout_width="wrap_content"
 					android:layout_height="match_parent"
-					android:layout_marginLeft="@dimen/margin_medium"
 					android:layout_marginStart="@dimen/margin_medium"
+					android:layout_marginLeft="@dimen/margin_medium"
 					android:ellipsize="end"
 					android:gravity="center_vertical"
 					android:maxLines="1"
 					android:textColor="@color/action_bar_text"
-					tools:text="Contact Name of someone who chose a long name"/>
+					tools:text="Contact Name of someone who chose a long name" />
 
 			</LinearLayout>
 
-		</android.support.v7.widget.Toolbar>
+		</androidx.appcompat.widget.Toolbar>
 
-	</android.support.design.widget.AppBarLayout>
+	</com.google.android.material.appbar.AppBarLayout>
 
 	<org.briarproject.briar.android.view.BriarRecyclerView
 		android:id="@+id/conversationView"
 		android:layout_width="match_parent"
 		android:layout_height="0dp"
 		android:layout_weight="2"
-		app:scrollToEnd="false"/>
+		app:scrollToEnd="false" />
 
 	<org.briarproject.briar.android.view.ImagePreview
 		android:id="@+id/imagePreview"
@@ -58,12 +57,12 @@
 		android:layout_height="0dp"
 		android:layout_weight="1"
 		android:visibility="gone"
-		tools:visibility="visible"/>
+		tools:visibility="visible" />
 
 	<org.briarproject.briar.android.view.TextInputView
 		android:id="@+id/text_input_container"
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
-		app:hint="@string/message_hint"/>
+		app:hint="@string/message_hint" />
 
 </LinearLayout>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/activity_create_forum.xml b/briar-android/src/main/res/layout/activity_create_forum.xml
index 9608cb568..6f0502ef6 100644
--- a/briar-android/src/main/res/layout/activity_create_forum.xml
+++ b/briar-android/src/main/res/layout/activity_create_forum.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -8,32 +7,32 @@
 	android:orientation="vertical"
 	android:padding="@dimen/margin_large">
 
-	<android.support.design.widget.TextInputLayout
+	<com.google.android.material.textfield.TextInputLayout
 		android:id="@+id/createForumNameLayout"
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
 		app:errorEnabled="true"
 		app:hintEnabled="false">
 
-		<android.support.design.widget.TextInputEditText
+		<com.google.android.material.textfield.TextInputEditText
 			android:id="@+id/createForumNameEntry"
 			android:layout_width="match_parent"
 			android:layout_height="wrap_content"
 			android:hint="@string/choose_forum_hint"
 			android:importantForAutofill="no"
 			android:inputType="text|textCapSentences"
-			android:maxLines="1"/>
+			android:maxLines="1" />
 
-		<requestFocus/>
+		<requestFocus />
 
-	</android.support.design.widget.TextInputLayout>
+	</com.google.android.material.textfield.TextInputLayout>
 
 	<Button
 		android:id="@+id/createForumButton"
 		style="@style/BriarButton"
 		android:enabled="false"
 		android:text="@string/create_forum_button"
-		tools:enabled="true"/>
+		tools:enabled="true" />
 
 	<ProgressBar
 		android:id="@+id/createForumProgressBar"
@@ -42,6 +41,6 @@
 		android:layout_gravity="center"
 		android:indeterminate="true"
 		android:visibility="gone"
-		tools:visibility="visible"/>
+		tools:visibility="visible" />
 
 </LinearLayout>
diff --git a/briar-android/src/main/res/layout/activity_dev_report.xml b/briar-android/src/main/res/layout/activity_dev_report.xml
index c06205faf..6edab7474 100644
--- a/briar-android/src/main/res/layout/activity_dev_report.xml
+++ b/briar-android/src/main/res/layout/activity_dev_report.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	android:orientation="vertical">
@@ -9,11 +8,11 @@
 		android:id="@+id/appBar"
 		layout="@layout/toolbar"
 		android:layout_width="match_parent"
-		android:layout_height="wrap_content"/>
+		android:layout_height="wrap_content" />
 
 	<FrameLayout
 		android:id="@+id/fragmentContainer"
 		android:layout_width="match_parent"
-		android:layout_height="match_parent"/>
+		android:layout_height="match_parent" />
 
 </LinearLayout>
diff --git a/briar-android/src/main/res/layout/activity_expired.xml b/briar-android/src/main/res/layout/activity_expired.xml
index fc99a4112..a6f335bec 100644
--- a/briar-android/src/main/res/layout/activity_expired.xml
+++ b/briar-android/src/main/res/layout/activity_expired.xml
@@ -1,12 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	android:orientation="vertical">
 
-	<LinearLayout
-		xmlns:android="http://schemas.android.com/apk/res/android"
+	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
 		android:layout_margin="@dimen/margin_large"
@@ -18,7 +16,7 @@
 			android:layout_margin="@dimen/margin_medium"
 			android:gravity="center"
 			android:text="@string/expiry_date_reached"
-			android:textSize="@dimen/text_size_large"/>
+			android:textSize="@dimen/text_size_large" />
 
 		<TextView
 			android:layout_width="match_parent"
@@ -26,7 +24,7 @@
 			android:layout_margin="@dimen/margin_medium"
 			android:gravity="center"
 			android:text="@string/download_briar"
-			android:textSize="@dimen/text_size_large"/>
+			android:textSize="@dimen/text_size_large" />
 
 		<TextView
 			android:layout_width="match_parent"
@@ -34,7 +32,7 @@
 			android:layout_margin="@dimen/margin_medium"
 			android:gravity="center"
 			android:text="@string/create_new_account"
-			android:textSize="@dimen/text_size_large"/>
+			android:textSize="@dimen/text_size_large" />
 
 		<Button
 			android:id="@+id/download_briar_button"
@@ -42,6 +40,6 @@
 			android:layout_width="match_parent"
 			android:layout_height="wrap_content"
 			android:layout_margin="@dimen/margin_medium"
-			android:text="@string/download_briar_button"/>
+			android:text="@string/download_briar_button" />
 	</LinearLayout>
 </ScrollView>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/activity_fragment_container.xml b/briar-android/src/main/res/layout/activity_fragment_container.xml
index e6c20760f..9e6dbe58a 100644
--- a/briar-android/src/main/res/layout/activity_fragment_container.xml
+++ b/briar-android/src/main/res/layout/activity_fragment_container.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<FrameLayout
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	android:id="@+id/fragmentContainer"
-	xmlns:android="http://schemas.android.com/apk/res/android"
 	android:layout_width="match_parent"
-	android:layout_height="match_parent"/>
\ No newline at end of file
+	android:layout_height="match_parent" />
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/activity_fragment_container_toolbar.xml b/briar-android/src/main/res/layout/activity_fragment_container_toolbar.xml
index 442bc6de7..8718e0b18 100644
--- a/briar-android/src/main/res/layout/activity_fragment_container_toolbar.xml
+++ b/briar-android/src/main/res/layout/activity_fragment_container_toolbar.xml
@@ -1,18 +1,16 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	android:orientation="vertical"
 	tools:context=".android.keyagreement.KeyAgreementActivity">
 
-	<include layout="@layout/toolbar"/>
+	<include layout="@layout/toolbar" />
 
-	<FrameLayout
+	<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 		android:id="@+id/fragmentContainer"
-		xmlns:android="http://schemas.android.com/apk/res/android"
 		android:layout_width="match_parent"
-		android:layout_height="match_parent"/>
+		android:layout_height="match_parent" />
 
 </LinearLayout>
diff --git a/briar-android/src/main/res/layout/activity_image.xml b/briar-android/src/main/res/layout/activity_image.xml
index 84f786f49..be5f2f0fd 100644
--- a/briar-android/src/main/res/layout/activity_image.xml
+++ b/briar-android/src/main/res/layout/activity_image.xml
@@ -1,26 +1,25 @@
 <?xml version="1.0" encoding="utf-8"?>
-<org.briarproject.briar.android.view.PullDownLayout
-	android:id="@+id/layout"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<org.briarproject.briar.android.view.PullDownLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@+id/layout"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	android:background="@color/briar_black"
 	tools:context=".android.conversation.ImageActivity">
 
-	<android.support.v4.view.ViewPager
+	<androidx.viewpager.widget.ViewPager
 		android:id="@+id/viewPager"
 		android:layout_width="match_parent"
 		android:layout_height="match_parent"
-		tools:background="@color/briar_green_light"/>
+		tools:background="@color/briar_green_light" />
 
-	<android.support.design.widget.AppBarLayout
+	<com.google.android.material.appbar.AppBarLayout
 		android:id="@+id/appBarLayout"
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
 		android:background="@color/msg_status_bubble_background">
 
-		<android.support.v7.widget.Toolbar
+		<androidx.appcompat.widget.Toolbar
 			android:id="@+id/toolbar"
 			style="@style/BriarToolbar"
 			android:layout_width="match_parent"
@@ -41,19 +40,19 @@
 					android:ellipsize="end"
 					android:maxLines="1"
 					android:textColor="@color/action_bar_text"
-					tools:text="Contact Name of someone who chose a long name"/>
+					tools:text="Contact Name of someone who chose a long name" />
 
 				<TextView
 					android:id="@+id/dateView"
 					android:layout_width="wrap_content"
 					android:layout_height="wrap_content"
 					android:textColor="@color/action_bar_text"
-					tools:text="date"/>
+					tools:text="date" />
 
 			</LinearLayout>
 
-		</android.support.v7.widget.Toolbar>
+		</androidx.appcompat.widget.Toolbar>
 
-	</android.support.design.widget.AppBarLayout>
+	</com.google.android.material.appbar.AppBarLayout>
 
 </org.briarproject.briar.android.view.PullDownLayout>
diff --git a/briar-android/src/main/res/layout/activity_nav_drawer.xml b/briar-android/src/main/res/layout/activity_nav_drawer.xml
index d33ed40aa..c1f0a2aea 100644
--- a/briar-android/src/main/res/layout/activity_nav_drawer.xml
+++ b/briar-android/src/main/res/layout/activity_nav_drawer.xml
@@ -1,15 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.v4.widget.DrawerLayout
-	android:id="@+id/drawer_layout"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.drawerlayout.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@+id/drawer_layout"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	tools:context=".android.navdrawer.NavDrawerActivity">
 
 	<!-- The first child(root) is the content view -->
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:id="@+id/constraintLayout"
 		android:layout_width="match_parent"
 		android:layout_height="match_parent">
@@ -21,9 +20,9 @@
 			android:layout_height="wrap_content"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toTopOf="parent"/>
+			app:layout_constraintTop_toTopOf="parent" />
 
-		<android.support.constraint.ConstraintLayout
+		<androidx.constraintlayout.widget.ConstraintLayout
 			android:id="@+id/expiryWarning"
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
@@ -45,7 +44,7 @@
 				android:textSize="@dimen/text_size_small"
 				app:layout_constraintEnd_toStartOf="@+id/expiryWarningClose"
 				app:layout_constraintStart_toStartOf="parent"
-				app:layout_constraintTop_toTopOf="parent"/>
+				app:layout_constraintTop_toTopOf="parent" />
 
 			<ImageView
 				android:id="@+id/expiryWarningClose"
@@ -57,9 +56,9 @@
 				android:tint="@color/briar_text_tertiary_inverse"
 				app:layout_constraintBottom_toBottomOf="parent"
 				app:layout_constraintEnd_toEndOf="parent"
-				app:layout_constraintTop_toTopOf="parent"/>
+				app:layout_constraintTop_toTopOf="parent" />
 
-		</android.support.constraint.ConstraintLayout>
+		</androidx.constraintlayout.widget.ConstraintLayout>
 
 		<FrameLayout
 			android:id="@+id/fragmentContainer"
@@ -68,15 +67,15 @@
 			app:layout_constraintBottom_toBottomOf="parent"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/expiryWarning"/>
+			app:layout_constraintTop_toBottomOf="@+id/expiryWarning" />
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 
 	<!-- The second child is the menu -->
 	<include
 		layout="@layout/navigation_menu"
 		android:layout_width="wrap_content"
 		android:layout_height="match_parent"
-		android:layout_gravity="start"/>
+		android:layout_gravity="start" />
 
-</android.support.v4.widget.DrawerLayout>
+</androidx.drawerlayout.widget.DrawerLayout>
diff --git a/briar-android/src/main/res/layout/activity_panic_preferences.xml b/briar-android/src/main/res/layout/activity_panic_preferences.xml
index c7f67ea03..f4477332e 100644
--- a/briar-android/src/main/res/layout/activity_panic_preferences.xml
+++ b/briar-android/src/main/res/layout/activity_panic_preferences.xml
@@ -1,12 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
-<FrameLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent">
 
 	<fragment
 		android:id="@+id/fragment"
+		android:name="org.briarproject.briar.android.panic.PanicPreferencesFragment"
 		android:layout_width="match_parent"
-		android:layout_height="match_parent"
-		android:name="org.briarproject.briar.android.panic.PanicPreferencesFragment"/>
+		android:layout_height="match_parent" />
 </FrameLayout>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/activity_reveal_contacts.xml b/briar-android/src/main/res/layout/activity_reveal_contacts.xml
index 4faa8c869..dbbbfd38c 100644
--- a/briar-android/src/main/res/layout/activity_reveal_contacts.xml
+++ b/briar-android/src/main/res/layout/activity_reveal_contacts.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
@@ -11,15 +10,15 @@
 		android:id="@+id/fragmentContainer"
 		android:layout_width="match_parent"
 		android:layout_height="0dp"
-		android:layout_weight="1"/>
+		android:layout_weight="1" />
 
 	<Button
 		android:id="@+id/revealButton"
 		style="@style/BriarButton"
-		android:layout_marginEnd="@dimen/margin_small"
-		android:layout_marginLeft="@dimen/margin_small"
-		android:layout_marginRight="@dimen/margin_small"
 		android:layout_marginStart="@dimen/margin_small"
-		android:text="@string/groups_reveal_contacts"/>
+		android:layout_marginLeft="@dimen/margin_small"
+		android:layout_marginEnd="@dimen/margin_small"
+		android:layout_marginRight="@dimen/margin_small"
+		android:text="@string/groups_reveal_contacts" />
 
 </LinearLayout>
diff --git a/briar-android/src/main/res/layout/activity_rss_feed_import.xml b/briar-android/src/main/res/layout/activity_rss_feed_import.xml
index c32272dcd..725c991b2 100644
--- a/briar-android/src/main/res/layout/activity_rss_feed_import.xml
+++ b/briar-android/src/main/res/layout/activity_rss_feed_import.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -9,7 +8,7 @@
 	android:padding="@dimen/margin_medium"
 	tools:context=".android.blog.RssFeedImportActivity">
 
-	<android.support.v7.widget.CardView
+	<androidx.cardview.widget.CardView
 		android:layout_width="match_parent"
 		android:layout_height="0dp"
 		android:layout_weight="1"
@@ -18,7 +17,7 @@
 		app:cardCornerRadius="0dp"
 		app:cardUseCompatPadding="false">
 
-		<android.support.design.widget.TextInputEditText
+		<com.google.android.material.textfield.TextInputEditText
 			android:id="@+id/urlInput"
 			android:layout_width="match_parent"
 			android:layout_height="match_parent"
@@ -31,18 +30,18 @@
 			android:padding="@dimen/margin_medium"
 			android:textColor="?android:attr/textColorPrimary">
 
-			<requestFocus/>
+			<requestFocus />
 
-		</android.support.design.widget.TextInputEditText>
+		</com.google.android.material.textfield.TextInputEditText>
 
-	</android.support.v7.widget.CardView>
+	</androidx.cardview.widget.CardView>
 
 	<Button
 		android:id="@+id/importButton"
 		style="@style/BriarButton"
 		android:enabled="false"
 		android:text="@string/blogs_rss_feeds_import_button"
-		tools:enabled="true"/>
+		tools:enabled="true" />
 
 	<ProgressBar
 		android:id="@+id/progressBar"
@@ -51,6 +50,6 @@
 		android:layout_height="wrap_content"
 		android:layout_gravity="center"
 		android:visibility="gone"
-		tools:visibility="gone"/>
+		tools:visibility="gone" />
 
 </LinearLayout>
diff --git a/briar-android/src/main/res/layout/activity_rss_feed_manage.xml b/briar-android/src/main/res/layout/activity_rss_feed_manage.xml
index 76c14b4aa..bc3b9ba65 100644
--- a/briar-android/src/main/res/layout/activity_rss_feed_manage.xml
+++ b/briar-android/src/main/res/layout/activity_rss_feed_manage.xml
@@ -1,11 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
-<org.briarproject.briar.android.view.BriarRecyclerView
-	xmlns:android="http://schemas.android.com/apk/res/android"
-	xmlns:tools="http://schemas.android.com/tools"
+<org.briarproject.briar.android.view.BriarRecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
+	xmlns:tools="http://schemas.android.com/tools"
 	android:id="@+id/feedList"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
-	app:scrollToEnd="false"
 	app:emptyText="@string/blogs_rss_feeds_manage_empty_state"
-	tools:listitem="@layout/list_item_rss_feed"/>
\ No newline at end of file
+	app:scrollToEnd="false"
+	tools:listitem="@layout/list_item_rss_feed" />
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/activity_settings.xml b/briar-android/src/main/res/layout/activity_settings.xml
index a75d590ab..f5c555431 100644
--- a/briar-android/src/main/res/layout/activity_settings.xml
+++ b/briar-android/src/main/res/layout/activity_settings.xml
@@ -1,12 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
-<FrameLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent">
 
 	<fragment
 		android:id="@+id/fragment"
+		android:name="org.briarproject.briar.android.settings.SettingsFragment"
 		android:layout_width="match_parent"
-		android:layout_height="match_parent"
-		android:name="org.briarproject.briar.android.settings.SettingsFragment"/>
+		android:layout_height="match_parent" />
 </FrameLayout>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/activity_sharing_status.xml b/briar-android/src/main/res/layout/activity_sharing_status.xml
index 2e808c62f..52c2af16f 100644
--- a/briar-android/src/main/res/layout/activity_sharing_status.xml
+++ b/briar-android/src/main/res/layout/activity_sharing_status.xml
@@ -1,24 +1,23 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	android:id="@+id/linearLayout"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@+id/linearLayout"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent">
 
-	<android.support.v7.widget.AppCompatImageView
+	<androidx.appcompat.widget.AppCompatImageView
 		android:id="@+id/infoView"
 		android:layout_width="wrap_content"
 		android:layout_height="0dp"
-		android:layout_marginLeft="8dp"
 		android:layout_marginStart="8dp"
+		android:layout_marginLeft="8dp"
 		android:elevation="@dimen/margin_tiny"
 		android:src="@drawable/ic_info_white"
 		app:layout_constraintBottom_toTopOf="@+id/divider"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
-		app:tint="?attr/colorControlNormal"/>
+		app:tint="?attr/colorControlNormal" />
 
 	<TextView
 		android:id="@+id/info"
@@ -32,7 +31,7 @@
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toEndOf="@+id/infoView"
 		app:layout_constraintTop_toTopOf="parent"
-		tools:text="@string/sharing_status_forum"/>
+		tools:text="@string/sharing_status_forum" />
 
 	<View
 		android:id="@+id/divider"
@@ -40,7 +39,7 @@
 		android:elevation="@dimen/margin_tiny"
 		app:layout_constraintBottom_toTopOf="@+id/list"
 		app:layout_constraintStart_toStartOf="@+id/info"
-		app:layout_constraintTop_toBottomOf="@+id/info"/>
+		app:layout_constraintTop_toBottomOf="@+id/info" />
 
 	<org.briarproject.briar.android.view.BriarRecyclerView
 		android:id="@+id/list"
@@ -51,6 +50,6 @@
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/divider"
 		app:scrollToEnd="false"
-		tools:listitem="@layout/list_item_contact_small"/>
+		tools:listitem="@layout/list_item_contact_small" />
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/activity_test_data.xml b/briar-android/src/main/res/layout/activity_test_data.xml
index 14a046abd..bd0c13dc6 100644
--- a/briar-android/src/main/res/layout/activity_test_data.xml
+++ b/briar-android/src/main/res/layout/activity_test_data.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -9,7 +8,7 @@
 	android:padding="@dimen/margin_medium"
 	tools:ignore="HardcodedText">
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content">
 
@@ -20,7 +19,7 @@
 			android:layout_margin="@dimen/margin_medium"
 			android:text="Number of contacts"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toTopOf="parent"/>
+			app:layout_constraintTop_toTopOf="parent" />
 
 		<SeekBar
 			android:id="@+id/seekBarContacts"
@@ -30,7 +29,7 @@
 			android:progress="20"
 			app:layout_constraintEnd_toStartOf="@+id/textViewContactsSb"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/textViewContacts"/>
+			app:layout_constraintTop_toBottomOf="@+id/textViewContacts" />
 
 		<TextView
 			android:id="@+id/textViewContactsSb"
@@ -40,7 +39,7 @@
 			android:text="20"
 			app:layout_constraintBottom_toBottomOf="@+id/seekBarContacts"
 			app:layout_constraintEnd_toEndOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/textViewContacts"/>
+			app:layout_constraintTop_toBottomOf="@+id/textViewContacts" />
 
 		<TextView
 			android:id="@+id/textViewMessages"
@@ -49,7 +48,7 @@
 			android:layout_margin="@dimen/margin_medium"
 			android:text="Number of messages per contact"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/seekBarContacts"/>
+			app:layout_constraintTop_toBottomOf="@+id/seekBarContacts" />
 
 		<SeekBar
 			android:id="@+id/seekBarMessages"
@@ -60,7 +59,7 @@
 			android:progress="20"
 			app:layout_constraintEnd_toStartOf="@+id/textViewMessagesSb"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/textViewMessages"/>
+			app:layout_constraintTop_toBottomOf="@+id/textViewMessages" />
 
 		<TextView
 			android:id="@+id/textViewMessagesSb"
@@ -70,7 +69,7 @@
 			android:text="20"
 			app:layout_constraintBottom_toBottomOf="@+id/seekBarMessages"
 			app:layout_constraintEnd_toEndOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/textViewMessages"/>
+			app:layout_constraintTop_toBottomOf="@+id/textViewMessages" />
 
 		<TextView
 			android:id="@+id/textViewBlogPosts"
@@ -79,7 +78,7 @@
 			android:layout_margin="@dimen/margin_medium"
 			android:text="Number of blog posts"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/seekBarMessages"/>
+			app:layout_constraintTop_toBottomOf="@+id/seekBarMessages" />
 
 		<SeekBar
 			android:id="@+id/seekBarBlogPosts"
@@ -90,7 +89,7 @@
 			android:progress="20"
 			app:layout_constraintEnd_toStartOf="@+id/TextViewBlogPostsSb"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/textViewBlogPosts"/>
+			app:layout_constraintTop_toBottomOf="@+id/textViewBlogPosts" />
 
 		<TextView
 			android:id="@+id/TextViewBlogPostsSb"
@@ -100,7 +99,7 @@
 			android:text="20"
 			app:layout_constraintBottom_toBottomOf="@+id/seekBarBlogPosts"
 			app:layout_constraintEnd_toEndOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/textViewBlogPosts"/>
+			app:layout_constraintTop_toBottomOf="@+id/textViewBlogPosts" />
 
 		<TextView
 			android:id="@+id/textViewForums"
@@ -109,7 +108,7 @@
 			android:layout_margin="@dimen/margin_medium"
 			android:text="Number of forums"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/seekBarBlogPosts"/>
+			app:layout_constraintTop_toBottomOf="@+id/seekBarBlogPosts" />
 
 		<SeekBar
 			android:id="@+id/seekBarForums"
@@ -120,7 +119,7 @@
 			android:progress="5"
 			app:layout_constraintEnd_toStartOf="@+id/TextViewForumsSb"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/textViewForums"/>
+			app:layout_constraintTop_toBottomOf="@+id/textViewForums" />
 
 		<TextView
 			android:id="@+id/TextViewForumsSb"
@@ -130,7 +129,7 @@
 			android:text="5"
 			app:layout_constraintBottom_toBottomOf="@+id/seekBarForums"
 			app:layout_constraintEnd_toEndOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/textViewForums"/>
+			app:layout_constraintTop_toBottomOf="@+id/textViewForums" />
 
 		<TextView
 			android:id="@+id/textViewForumMessages"
@@ -139,7 +138,7 @@
 			android:layout_margin="@dimen/margin_medium"
 			android:text="Number of forum messages"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/seekBarForums"/>
+			app:layout_constraintTop_toBottomOf="@+id/seekBarForums" />
 
 		<SeekBar
 			android:id="@+id/seekBarForumMessages"
@@ -150,7 +149,7 @@
 			android:progress="20"
 			app:layout_constraintEnd_toStartOf="@+id/TextViewForumMessagesSb"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/textViewForumMessages"/>
+			app:layout_constraintTop_toBottomOf="@+id/textViewForumMessages" />
 
 		<TextView
 			android:id="@+id/TextViewForumMessagesSb"
@@ -160,7 +159,7 @@
 			android:text="20"
 			app:layout_constraintBottom_toBottomOf="@+id/seekBarForumMessages"
 			app:layout_constraintEnd_toEndOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/textViewForumMessages"/>
+			app:layout_constraintTop_toBottomOf="@+id/textViewForumMessages" />
 
 		<Button
 			android:id="@+id/buttonCreateTestData"
@@ -173,7 +172,7 @@
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/seekBarForumMessages"
-			app:layout_constraintVertical_bias="1.0"/>
-	</android.support.constraint.ConstraintLayout>
+			app:layout_constraintVertical_bias="1.0" />
+	</androidx.constraintlayout.widget.ConstraintLayout>
 
 </ScrollView>
diff --git a/briar-android/src/main/res/layout/activity_threaded_conversation.xml b/briar-android/src/main/res/layout/activity_threaded_conversation.xml
index 09bec0926..19753cac9 100644
--- a/briar-android/src/main/res/layout/activity_threaded_conversation.xml
+++ b/briar-android/src/main/res/layout/activity_threaded_conversation.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -8,7 +7,7 @@
 	android:orientation="vertical"
 	tools:context=".android.forum.ForumActivity">
 
-	<include layout="@layout/toolbar"/>
+	<include layout="@layout/toolbar" />
 
 	<FrameLayout
 		android:layout_width="match_parent"
@@ -21,21 +20,21 @@
 			android:layout_width="match_parent"
 			android:layout_height="match_parent"
 			app:emptyText="@string/no_forum_posts"
-			app:scrollToEnd="false"/>
+			app:scrollToEnd="false" />
 
 		<org.briarproject.briar.android.view.UnreadMessageButton
 			android:id="@+id/upButton"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
 			android:layout_gravity="top|right|end"
-			app:direction="up"/>
+			app:direction="up" />
 
 		<org.briarproject.briar.android.view.UnreadMessageButton
 			android:id="@+id/downButton"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
 			android:layout_gravity="bottom|right|end"
-			app:direction="down"/>
+			app:direction="down" />
 
 	</FrameLayout>
 
@@ -43,6 +42,6 @@
 		android:id="@+id/text_input_container"
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
-		app:hint="@string/forum_new_message_hint"/>
+		app:hint="@string/forum_new_message_hint" />
 
 </LinearLayout>
diff --git a/briar-android/src/main/res/layout/activity_unlock.xml b/briar-android/src/main/res/layout/activity_unlock.xml
index 4a157595a..8214c059f 100644
--- a/briar-android/src/main/res/layout/activity_unlock.xml
+++ b/briar-android/src/main/res/layout/activity_unlock.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -8,7 +7,7 @@
 	android:orientation="vertical"
 	tools:context=".android.account.UnlockActivity">
 
-	<android.support.v7.widget.AppCompatImageView
+	<androidx.appcompat.widget.AppCompatImageView
 		android:id="@+id/image"
 		android:layout_width="150dp"
 		android:layout_height="150dp"
@@ -19,6 +18,6 @@
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
 		app:layout_constraintVertical_bias="0.1"
-		app:tint="?attr/colorControlNormal"/>
+		app:tint="?attr/colorControlNormal" />
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/activity_write_blog_post.xml b/briar-android/src/main/res/layout/activity_write_blog_post.xml
index df7453d78..880a6191c 100644
--- a/briar-android/src/main/res/layout/activity_write_blog_post.xml
+++ b/briar-android/src/main/res/layout/activity_write_blog_post.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<FrameLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -16,7 +15,7 @@
 		app:fillHeight="true"
 		app:hint="@string/blogs_write_blog_post_body_hint">
 
-		<requestFocus/>
+		<requestFocus />
 
 	</org.briarproject.briar.android.view.LargeTextInputView>
 
@@ -26,6 +25,6 @@
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
 		android:layout_gravity="center"
-		android:visibility="invisible"/>
+		android:visibility="invisible" />
 
 </FrameLayout>
diff --git a/briar-android/src/main/res/layout/author_view.xml b/briar-android/src/main/res/layout/author_view.xml
index 55d6a3099..a90aeb046 100644
--- a/briar-android/src/main/res/layout/author_view.xml
+++ b/briar-android/src/main/res/layout/author_view.xml
@@ -1,12 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
-<merge
-	android:id="@+id/merge"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<merge xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@+id/merge"
 	tools:layout_height="wrap_content"
 	tools:layout_width="match_parent"
-	tools:parentTag="android.support.constraint.ConstraintLayout"
+	tools:parentTag="androidx.constraintlayout.widget.ConstraintLayout"
 	tools:showIn="@layout/list_item_blog_post">
 
 	<de.hdodenhof.circleimageview.CircleImageView
@@ -20,7 +19,7 @@
 		app:layout_constraintHorizontal_chainStyle="packed"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
-		tools:src="@mipmap/ic_launcher_round"/>
+		tools:src="@mipmap/ic_launcher_round" />
 
 	<ImageView
 		android:id="@+id/avatarIcon"
@@ -33,23 +32,23 @@
 		android:src="@drawable/ic_repeat"
 		android:visibility="invisible"
 		app:layout_constraintBottom_toBottomOf="@+id/avatar"
-		app:layout_constraintEnd_toEndOf="@+id/avatar"/>
+		app:layout_constraintEnd_toEndOf="@+id/avatar" />
 
 	<com.vanniktech.emoji.EmojiTextView
 		android:id="@+id/authorName"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="@dimen/margin_medium"
-		android:layout_marginLeft="@dimen/margin_medium"
-		android:layout_marginRight="@dimen/margin_medium"
 		android:layout_marginStart="@dimen/margin_medium"
+		android:layout_marginLeft="@dimen/margin_medium"
+		android:layout_marginEnd="@dimen/margin_medium"
+		android:layout_marginRight="@dimen/margin_medium"
 		android:textColor="?android:attr/textColorPrimary"
 		android:textSize="@dimen/text_size_small"
 		app:layout_constrainedWidth="true"
 		app:layout_constraintEnd_toStartOf="@+id/trustIndicator"
 		app:layout_constraintStart_toEndOf="@+id/avatar"
 		app:layout_constraintTop_toTopOf="parent"
-		tools:text="Author View that can have a long name"/>
+		tools:text="Author View that can have a long name" />
 
 	<org.briarproject.briar.android.view.TrustIndicatorView
 		android:id="@+id/trustIndicator"
@@ -61,7 +60,7 @@
 		app:layout_constraintTop_toTopOf="@+id/authorName"
 		app:layout_goneMarginEnd="0dp"
 		app:layout_goneMarginStart="0dp"
-		tools:src="@drawable/trust_indicator_verified"/>
+		tools:src="@drawable/trust_indicator_verified" />
 
 	<TextView
 		android:id="@+id/dateView"
@@ -72,6 +71,6 @@
 		app:layout_constraintStart_toStartOf="@+id/authorName"
 		app:layout_constraintTop_toBottomOf="@+id/authorName"
 		tools:text="yesterday"
-		tools:visibility="visible"/>
+		tools:visibility="visible" />
 
 </merge>
diff --git a/briar-android/src/main/res/layout/briar_recycler_view.xml b/briar-android/src/main/res/layout/briar_recycler_view.xml
index cf6564dce..8bd992c85 100644
--- a/briar-android/src/main/res/layout/briar_recycler_view.xml
+++ b/briar-android/src/main/res/layout/briar_recycler_view.xml
@@ -1,12 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent">
 
-	<android.support.v7.widget.RecyclerView
+	<androidx.recyclerview.widget.RecyclerView
 		android:id="@+id/recyclerView"
 		android:layout_width="match_parent"
 		android:layout_height="match_parent"
@@ -14,7 +13,7 @@
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
 		tools:listitem="@layout/list_item_contact"
-		tools:visibility="visible"/>
+		tools:visibility="visible" />
 
 	<ProgressBar
 		android:id="@+id/progressBar"
@@ -25,24 +24,24 @@
 		app:layout_constraintLeft_toLeftOf="parent"
 		app:layout_constraintRight_toRightOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
-		tools:visibility="invisible"/>
+		tools:visibility="invisible" />
 
-	<android.support.v7.widget.AppCompatImageView
+	<androidx.appcompat.widget.AppCompatImageView
 		android:id="@+id/emptyImage"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="16dp"
-		android:layout_marginLeft="16dp"
-		android:layout_marginRight="16dp"
 		android:layout_marginStart="16dp"
+		android:layout_marginLeft="16dp"
 		android:layout_marginTop="16dp"
+		android:layout_marginEnd="16dp"
+		android:layout_marginRight="16dp"
 		app:layout_constraintBottom_toTopOf="@+id/emptyText"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
 		app:layout_constraintVertical_chainStyle="packed"
 		app:tint="?attr/colorControlNormal"
-		tools:src="@drawable/ic_empty_state_group_list"/>
+		tools:src="@drawable/ic_empty_state_group_list" />
 
 	<TextView
 		android:id="@+id/emptyText"
@@ -56,21 +55,21 @@
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/emptyImage"
-		tools:text="@string/no_contacts"/>
+		tools:text="@string/no_contacts" />
 
 	<TextView
 		android:id="@+id/emptyAction"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
 		android:gravity="center"
-		android:paddingBottom="@dimen/margin_large"
 		android:paddingLeft="@dimen/margin_large"
 		android:paddingRight="@dimen/margin_large"
+		android:paddingBottom="@dimen/margin_large"
 		android:textSize="@dimen/text_size_small"
 		app:layout_constraintBottom_toBottomOf="parent"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/emptyText"
-		tools:text="@string/no_contacts_action"/>
+		tools:text="@string/no_contacts_action" />
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/checkbox.xml b/briar-android/src/main/res/layout/checkbox.xml
index e5cf27a1d..b08cba81b 100644
--- a/briar-android/src/main/res/layout/checkbox.xml
+++ b/briar-android/src/main/res/layout/checkbox.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<FrameLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content">
 
@@ -8,10 +7,10 @@
 		android:id="@+id/checkbox"
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
-		android:layout_marginLeft="@dimen/margin_activity_horizontal"
 		android:layout_marginStart="@dimen/margin_activity_horizontal"
+		android:layout_marginLeft="@dimen/margin_activity_horizontal"
 		android:layout_marginTop="@dimen/margin_activity_vertical"
 		android:checked="false"
-		android:text="@string/don_t_ask_again"/>
+		android:text="@string/don_t_ask_again" />
 
 </FrameLayout>
diff --git a/briar-android/src/main/res/layout/contact_avatar_status.xml b/briar-android/src/main/res/layout/contact_avatar_status.xml
index 18fee6a1d..f499e4ba0 100644
--- a/briar-android/src/main/res/layout/contact_avatar_status.xml
+++ b/briar-android/src/main/res/layout/contact_avatar_status.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<FrameLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="32dp"
@@ -13,7 +12,7 @@
 		android:layout_width="30dp"
 		android:layout_height="30dp"
 		app:civ_border_color="@color/action_bar_text"
-		tools:src="@mipmap/ic_launcher_round"/>
+		tools:src="@mipmap/ic_launcher_round" />
 
 	<ImageView
 		android:id="@+id/contactStatus"
@@ -22,6 +21,6 @@
 		android:layout_gravity="bottom|end|right"
 		android:scaleType="fitCenter"
 		tools:ignore="ContentDescription"
-		tools:src="@drawable/contact_online"/>
+		tools:src="@drawable/contact_online" />
 
 </FrameLayout>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/dialog_screen_filter.xml b/briar-android/src/main/res/layout/dialog_screen_filter.xml
index b15e6b310..a591bb968 100644
--- a/briar-android/src/main/res/layout/dialog_screen_filter.xml
+++ b/briar-android/src/main/res/layout/dialog_screen_filter.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
@@ -16,7 +15,7 @@
 			android:id="@+id/screen_filter_message"
 			android:layout_width="match_parent"
 			android:layout_height="wrap_content"
-			tools:text="@string/screen_filter_body"/>
+			tools:text="@string/screen_filter_body" />
 
 	</ScrollView>
 
@@ -26,6 +25,6 @@
 		android:layout_height="wrap_content"
 		android:layout_marginTop="@dimen/margin_large"
 		android:layout_weight="0"
-		android:text="@string/screen_filter_allow"/>
+		android:text="@string/screen_filter_allow" />
 
 </LinearLayout>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/emoji_text_input_view.xml b/briar-android/src/main/res/layout/emoji_text_input_view.xml
index cb0a3a8a8..e5979c12e 100644
--- a/briar-android/src/main/res/layout/emoji_text_input_view.xml
+++ b/briar-android/src/main/res/layout/emoji_text_input_view.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<merge
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<merge xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -9,7 +8,7 @@
 	tools:parentTag="android.widget.LinearLayout"
 	tools:showIn="@layout/fragment_reblog">
 
-	<android.support.v7.widget.AppCompatImageButton
+	<androidx.appcompat.widget.AppCompatImageButton
 		android:id="@+id/emoji_toggle"
 		android:layout_width="@dimen/text_input_height"
 		android:layout_height="@dimen/text_input_height"
@@ -18,7 +17,7 @@
 		android:padding="@dimen/margin_small"
 		android:scaleType="center"
 		android:src="@drawable/ic_emoji_toggle"
-		app:tint="?attr/colorControlNormal"/>
+		app:tint="?attr/colorControlNormal" />
 
 	<com.vanniktech.emoji.EmojiEditText
 		android:id="@+id/input_text"
@@ -30,6 +29,6 @@
 		android:inputType="textMultiLine|textCapSentences|textAutoCorrect"
 		android:minHeight="@dimen/text_input_height"
 		android:textColor="?android:attr/textColorPrimary"
-		tools:text="Line 1\nLine 2\nLine 3"/>
+		tools:text="Line 1\nLine 2\nLine 3" />
 
 </merge>
diff --git a/briar-android/src/main/res/layout/fragment_alias_dialog.xml b/briar-android/src/main/res/layout/fragment_alias_dialog.xml
index 8e992569e..2aaf84d6a 100644
--- a/briar-android/src/main/res/layout/fragment_alias_dialog.xml
+++ b/briar-android/src/main/res/layout/fragment_alias_dialog.xml
@@ -1,13 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content"
 	android:orientation="vertical"
 	android:paddingLeft="16dp"
-	android:paddingRight="16dp"
-	android:paddingTop="16dp">
+	android:paddingTop="16dp"
+	android:paddingRight="16dp">
 
 	<TextView
 		android:id="@+id/titleView"
@@ -16,16 +15,16 @@
 		android:text="@string/set_contact_alias"
 		android:textColor="?android:attr/textColorPrimary"
 		android:textSize="@dimen/text_size_large"
-		android:textStyle="bold"/>
+		android:textStyle="bold" />
 
-	<android.support.design.widget.TextInputLayout
+	<com.google.android.material.textfield.TextInputLayout
 		android:id="@+id/aliasEditLayout"
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
 		app:errorEnabled="true"
 		app:hintEnabled="false">
 
-		<android.support.design.widget.TextInputEditText
+		<com.google.android.material.textfield.TextInputEditText
 			android:id="@+id/aliasEditText"
 			android:layout_width="match_parent"
 			android:layout_height="wrap_content"
@@ -33,15 +32,15 @@
 			android:hint="@string/set_contact_alias_hint"
 			android:inputType="text|textCapWords"
 			android:textColor="?android:attr/textColorPrimary"
-			android:textSize="@dimen/text_size_medium"/>
+			android:textSize="@dimen/text_size_medium" />
 
-	</android.support.design.widget.TextInputLayout>
+	</com.google.android.material.textfield.TextInputLayout>
 
 	<LinearLayout
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
-		android:layout_marginLeft="@dimen/margin_xxlarge"
 		android:layout_marginStart="@dimen/margin_xxlarge"
+		android:layout_marginLeft="@dimen/margin_xxlarge"
 		android:gravity="end"
 		android:orientation="horizontal">
 
@@ -50,14 +49,14 @@
 			style="@style/BriarButtonFlat.Negative"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
-			android:text="@string/cancel"/>
+			android:text="@string/cancel" />
 
 		<Button
 			android:id="@+id/setButton"
 			style="@style/BriarButtonFlat.Positive"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
-			android:text="@string/set_alias_button"/>
+			android:text="@string/set_alias_button" />
 
 	</LinearLayout>
 
diff --git a/briar-android/src/main/res/layout/fragment_blog.xml b/briar-android/src/main/res/layout/fragment_blog.xml
index df5e36a9e..0281a9ed1 100644
--- a/briar-android/src/main/res/layout/fragment_blog.xml
+++ b/briar-android/src/main/res/layout/fragment_blog.xml
@@ -1,10 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
-<org.briarproject.briar.android.view.BriarRecyclerView
-	android:id="@+id/postList"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<org.briarproject.briar.android.view.BriarRecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@+id/postList"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	app:scrollToEnd="false"
-	tools:context=".android.blog.BlogActivity"/>
+	tools:context=".android.blog.BlogActivity" />
diff --git a/briar-android/src/main/res/layout/fragment_blog_post.xml b/briar-android/src/main/res/layout/fragment_blog_post.xml
index 312d7704c..0824308cd 100644
--- a/briar-android/src/main/res/layout/fragment_blog_post.xml
+++ b/briar-android/src/main/res/layout/fragment_blog_post.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent">
 
@@ -18,14 +17,14 @@
 			style="@style/BriarCard"
 			layout="@layout/list_item_blog_post"
 			android:layout_width="match_parent"
-			android:layout_height="wrap_content"/>
+			android:layout_height="wrap_content" />
 
 		<ProgressBar
 			android:id="@+id/progressBar"
 			style="?android:attr/progressBarStyleLarge"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
-			android:layout_gravity="center"/>
+			android:layout_gravity="center" />
 
 	</FrameLayout>
 
diff --git a/briar-android/src/main/res/layout/fragment_contact_list.xml b/briar-android/src/main/res/layout/fragment_contact_list.xml
index 646c7d506..d4575794b 100644
--- a/briar-android/src/main/res/layout/fragment_contact_list.xml
+++ b/briar-android/src/main/res/layout/fragment_contact_list.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.design.widget.CoordinatorLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent">
@@ -10,7 +9,7 @@
 		android:layout_width="match_parent"
 		android:layout_height="match_parent"
 		app:layout_behavior="org.briarproject.briar.android.view.SnackbarAwareBehavior"
-		app:scrollToEnd="false"/>
+		app:scrollToEnd="false" />
 
 	<io.github.kobakei.materialfabspeeddial.FabSpeedDial
 		android:id="@+id/speedDial"
@@ -22,6 +21,6 @@
 		app:fab_miniFabTextBackground="@color/briar_accent"
 		app:fab_miniFabTextColor="@android:color/white"
 		app:layout_anchorGravity="bottom|right|end"
-		app:layout_behavior="org.briarproject.briar.android.view.SnackbarAwareBehavior"/>
+		app:layout_behavior="org.briarproject.briar.android.view.SnackbarAwareBehavior" />
 
-</android.support.design.widget.CoordinatorLayout>
+</androidx.coordinatorlayout.widget.CoordinatorLayout>
diff --git a/briar-android/src/main/res/layout/fragment_crash.xml b/briar-android/src/main/res/layout/fragment_crash.xml
index a92013190..9603406e5 100644
--- a/briar-android/src/main/res/layout/fragment_crash.xml
+++ b/briar-android/src/main/res/layout/fragment_crash.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -15,12 +14,12 @@
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent">
 
-		<android.support.constraint.ConstraintLayout
+		<androidx.constraintlayout.widget.ConstraintLayout
 			android:layout_width="match_parent"
 			android:layout_height="wrap_content"
 			android:padding="@dimen/margin_large">
 
-			<android.support.v7.widget.AppCompatImageView
+			<androidx.appcompat.widget.AppCompatImageView
 				android:id="@+id/errorIcon"
 				android:layout_width="0dp"
 				android:layout_height="0dp"
@@ -34,7 +33,7 @@
 				app:layout_constraintTop_toTopOf="parent"
 				app:layout_constraintVertical_chainStyle="packed"
 				app:tint="?attr/colorControlNormal"
-				tools:ignore="ContentDescription"/>
+				tools:ignore="ContentDescription" />
 
 			<TextView
 				android:id="@+id/crashed"
@@ -48,7 +47,7 @@
 				app:layout_constraintEnd_toEndOf="parent"
 				app:layout_constraintStart_toStartOf="parent"
 				app:layout_constraintTop_toBottomOf="@+id/errorIcon"
-				tools:layout_editor_absoluteY="8dp"/>
+				tools:layout_editor_absoluteY="8dp" />
 
 			<TextView
 				android:id="@+id/fault"
@@ -62,7 +61,7 @@
 				app:layout_constraintBottom_toTopOf="@+id/pleaseSend"
 				app:layout_constraintEnd_toEndOf="parent"
 				app:layout_constraintStart_toStartOf="parent"
-				app:layout_constraintTop_toBottomOf="@+id/crashed"/>
+				app:layout_constraintTop_toBottomOf="@+id/crashed" />
 
 			<TextView
 				android:id="@+id/pleaseSend"
@@ -76,7 +75,7 @@
 				app:layout_constraintBottom_toTopOf="@+id/encrypted"
 				app:layout_constraintEnd_toEndOf="parent"
 				app:layout_constraintStart_toStartOf="parent"
-				app:layout_constraintTop_toBottomOf="@+id/fault"/>
+				app:layout_constraintTop_toBottomOf="@+id/fault" />
 
 			<TextView
 				android:id="@+id/encrypted"
@@ -90,9 +89,9 @@
 				app:layout_constraintBottom_toBottomOf="parent"
 				app:layout_constraintEnd_toEndOf="parent"
 				app:layout_constraintStart_toStartOf="parent"
-				app:layout_constraintTop_toBottomOf="@+id/pleaseSend"/>
+				app:layout_constraintTop_toBottomOf="@+id/pleaseSend" />
 
-		</android.support.constraint.ConstraintLayout>
+		</androidx.constraintlayout.widget.ConstraintLayout>
 
 	</ScrollView>
 
@@ -106,7 +105,7 @@
 		app:layout_constraintEnd_toStartOf="@+id/acceptButton"
 		app:layout_constraintHorizontal_weight="1"
 		app:layout_constraintStart_toStartOf="parent"
-		app:layout_constraintTop_toTopOf="@+id/acceptButton"/>
+		app:layout_constraintTop_toTopOf="@+id/acceptButton" />
 
 	<Button
 		android:id="@+id/acceptButton"
@@ -118,6 +117,6 @@
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintHorizontal_weight="1"
 		app:layout_constraintStart_toEndOf="@+id/declineButton"
-		app:layout_constraintTop_toBottomOf="@+id/scrollView"/>
+		app:layout_constraintTop_toBottomOf="@+id/scrollView" />
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/fragment_create_group.xml b/briar-android/src/main/res/layout/fragment_create_group.xml
index 200c0e959..10786b5a4 100644
--- a/briar-android/src/main/res/layout/fragment_create_group.xml
+++ b/briar-android/src/main/res/layout/fragment_create_group.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -8,32 +7,32 @@
 	android:orientation="vertical"
 	android:padding="@dimen/margin_large">
 
-	<android.support.design.widget.TextInputLayout
+	<com.google.android.material.textfield.TextInputLayout
 		android:id="@+id/nameLayout"
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
 		app:errorEnabled="true"
 		app:hintEnabled="false">
 
-		<android.support.design.widget.TextInputEditText
+		<com.google.android.material.textfield.TextInputEditText
 			android:id="@+id/name"
 			android:layout_width="match_parent"
 			android:layout_height="wrap_content"
 			android:hint="@string/groups_create_group_hint"
 			android:importantForAutofill="no"
 			android:inputType="text|textCapSentences"
-			android:maxLines="1"/>
+			android:maxLines="1" />
 
-		<requestFocus/>
+		<requestFocus />
 
-	</android.support.design.widget.TextInputLayout>
+	</com.google.android.material.textfield.TextInputLayout>
 
 	<Button
 		android:id="@+id/button"
 		style="@style/BriarButton"
 		android:enabled="false"
 		android:text="@string/groups_create_group_button"
-		tools:enabled="true"/>
+		tools:enabled="true" />
 
 	<ProgressBar
 		android:id="@+id/progressBar"
@@ -42,6 +41,6 @@
 		android:layout_gravity="center"
 		android:indeterminate="true"
 		android:visibility="gone"
-		tools:visibility="visible"/>
+		tools:visibility="visible" />
 
 </LinearLayout>
diff --git a/briar-android/src/main/res/layout/fragment_error.xml b/briar-android/src/main/res/layout/fragment_error.xml
index 0c8ff3a67..300ff69a0 100644
--- a/briar-android/src/main/res/layout/fragment_error.xml
+++ b/briar-android/src/main/res/layout/fragment_error.xml
@@ -1,55 +1,54 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent">
 
-	<android.support.v7.widget.AppCompatImageView
+	<androidx.appcompat.widget.AppCompatImageView
 		android:id="@+id/errorIcon"
 		android:layout_width="128dp"
 		android:layout_height="128dp"
-		android:layout_marginEnd="8dp"
-		android:layout_marginLeft="8dp"
-		android:layout_marginRight="8dp"
 		android:layout_marginStart="8dp"
+		android:layout_marginLeft="8dp"
 		android:layout_marginTop="8dp"
+		android:layout_marginEnd="8dp"
+		android:layout_marginRight="8dp"
 		android:src="@drawable/alerts_and_states_error"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
 		app:tint="?attr/colorControlNormal"
-		tools:ignore="ContentDescription"/>
+		tools:ignore="ContentDescription" />
 
 	<TextView
 		android:id="@+id/errorTitle"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="8dp"
-		android:layout_marginLeft="8dp"
-		android:layout_marginRight="8dp"
 		android:layout_marginStart="8dp"
+		android:layout_marginLeft="8dp"
 		android:layout_marginTop="8dp"
+		android:layout_marginEnd="8dp"
+		android:layout_marginRight="8dp"
 		android:text="@string/sorry"
 		android:textSize="@dimen/text_size_xlarge"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
-		app:layout_constraintTop_toBottomOf="@+id/errorIcon"/>
+		app:layout_constraintTop_toBottomOf="@+id/errorIcon" />
 
 	<TextView
 		android:id="@+id/errorMessage"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="16dp"
-		android:layout_marginLeft="16dp"
-		android:layout_marginRight="16dp"
 		android:layout_marginStart="16dp"
+		android:layout_marginLeft="16dp"
 		android:layout_marginTop="8dp"
+		android:layout_marginEnd="16dp"
+		android:layout_marginRight="16dp"
 		android:textSize="@dimen/text_size_medium"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/errorTitle"
-		tools:text="@string/qr_code_unsupported"/>
+		tools:text="@string/qr_code_unsupported" />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/briar-android/src/main/res/layout/fragment_error_contact_exchange.xml b/briar-android/src/main/res/layout/fragment_error_contact_exchange.xml
index 48a563ca1..3e18f40b1 100644
--- a/briar-android/src/main/res/layout/fragment_error_contact_exchange.xml
+++ b/briar-android/src/main/res/layout/fragment_error_contact_exchange.xml
@@ -1,13 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	android:fillViewport="true">
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content">
 
@@ -21,32 +20,32 @@
 			android:textSize="@dimen/text_size_large"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toTopOf="parent"/>
+			app:layout_constraintTop_toTopOf="parent" />
 
-		<android.support.v7.widget.AppCompatImageView
+		<androidx.appcompat.widget.AppCompatImageView
 			android:id="@+id/errorIcon"
 			android:layout_width="match_parent"
 			android:layout_height="wrap_content"
 			android:layout_marginLeft="16dp"
-			android:layout_marginRight="16dp"
 			android:layout_marginTop="16dp"
+			android:layout_marginRight="16dp"
 			android:scaleType="fitCenter"
 			android:src="@drawable/qr_code_error"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/errorTitle"
 			app:tint="?attr/colorControlNormal"
-			tools:ignore="ContentDescription"/>
+			tools:ignore="ContentDescription" />
 
 		<TextView
 			android:id="@+id/errorMessage"
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
-			android:layout_marginEnd="16dp"
-			android:layout_marginLeft="16dp"
-			android:layout_marginRight="16dp"
 			android:layout_marginStart="16dp"
+			android:layout_marginLeft="16dp"
 			android:layout_marginTop="8dp"
+			android:layout_marginEnd="16dp"
+			android:layout_marginRight="16dp"
 			android:textColor="?android:attr/textColorPrimary"
 			android:textSize="@dimen/text_size_medium"
 			app:layout_constraintBottom_toTopOf="@+id/sendFeedback"
@@ -55,55 +54,55 @@
 			app:layout_constraintTop_toBottomOf="@+id/errorIcon"
 			app:layout_constraintVertical_bias="0"
 			app:layout_constraintVertical_chainStyle="packed"
-			tools:text="@string/connection_error_explanation"/>
+			tools:text="@string/connection_error_explanation" />
 
 		<TextView
 			android:id="@+id/sendFeedback"
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
-			android:layout_marginEnd="16dp"
-			android:layout_marginLeft="16dp"
-			android:layout_marginRight="16dp"
 			android:layout_marginStart="16dp"
+			android:layout_marginLeft="16dp"
 			android:layout_marginTop="8dp"
+			android:layout_marginEnd="16dp"
+			android:layout_marginRight="16dp"
 			android:text="@string/connection_error_feedback"
 			android:textColor="?android:attr/textColorPrimary"
 			android:textSize="@dimen/text_size_medium"
 			app:layout_constraintBottom_toTopOf="@+id/tryAgainButton"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/errorMessage"/>
+			app:layout_constraintTop_toBottomOf="@+id/errorMessage" />
 
 		<Button
 			android:id="@+id/tryAgainButton"
 			style="@style/BriarButtonFlat.Positive"
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
-			android:layout_marginBottom="8dp"
 			android:layout_marginEnd="8dp"
 			android:layout_marginRight="8dp"
+			android:layout_marginBottom="8dp"
 			android:text="@string/try_again_button"
 			app:layout_constraintBottom_toBottomOf="parent"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintHorizontal_weight="1"
-			app:layout_constraintStart_toEndOf="@+id/cancelButton"/>
+			app:layout_constraintStart_toEndOf="@+id/cancelButton" />
 
 		<Button
 			android:id="@+id/cancelButton"
 			style="@style/BriarButtonFlat.Negative"
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
-			android:layout_marginBottom="8dp"
-			android:layout_marginEnd="8dp"
-			android:layout_marginLeft="8dp"
-			android:layout_marginRight="8dp"
 			android:layout_marginStart="8dp"
+			android:layout_marginLeft="8dp"
+			android:layout_marginEnd="8dp"
+			android:layout_marginRight="8dp"
+			android:layout_marginBottom="8dp"
 			android:text="@string/cancel"
 			app:layout_constraintBottom_toBottomOf="parent"
 			app:layout_constraintEnd_toStartOf="@+id/tryAgainButton"
 			app:layout_constraintHorizontal_chainStyle="spread"
 			app:layout_constraintHorizontal_weight="1"
-			app:layout_constraintStart_toStartOf="parent"/>
+			app:layout_constraintStart_toStartOf="parent" />
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 </ScrollView>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/fragment_forum_list.xml b/briar-android/src/main/res/layout/fragment_forum_list.xml
index 2a34c3e78..b4351eae1 100644
--- a/briar-android/src/main/res/layout/fragment_forum_list.xml
+++ b/briar-android/src/main/res/layout/fragment_forum_list.xml
@@ -1,11 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
-<org.briarproject.briar.android.view.BriarRecyclerView
-	android:id="@+id/forumList"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<org.briarproject.briar.android.view.BriarRecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
+	android:id="@+id/forumList"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	app:emptyAction="@string/no_forums_action"
 	app:emptyImage="@drawable/ic_empty_state_forum_list"
 	app:emptyText="@string/no_forums"
-	app:layout_behavior="org.briarproject.briar.android.view.BriarRecyclerViewBehavior"/>
+	app:layout_behavior="org.briarproject.briar.android.view.BriarRecyclerViewBehavior" />
diff --git a/briar-android/src/main/res/layout/fragment_image.xml b/briar-android/src/main/res/layout/fragment_image.xml
index 2da926ea9..a988c1cdc 100644
--- a/briar-android/src/main/res/layout/fragment_image.xml
+++ b/briar-android/src/main/res/layout/fragment_image.xml
@@ -1,9 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
-<com.github.chrisbanes.photoview.PhotoView
-	android:id="@+id/photoView"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<com.github.chrisbanes.photoview.PhotoView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@+id/photoView"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	tools:ignore="ContentDescription"
-	tools:srcCompat="@tools:sample/backgrounds/scenic"/>
+	tools:srcCompat="@tools:sample/backgrounds/scenic" />
diff --git a/briar-android/src/main/res/layout/fragment_keyagreement_id.xml b/briar-android/src/main/res/layout/fragment_keyagreement_id.xml
index 409887827..d72c5c55c 100644
--- a/briar-android/src/main/res/layout/fragment_keyagreement_id.xml
+++ b/briar-android/src/main/res/layout/fragment_keyagreement_id.xml
@@ -1,14 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView
-	android:id="@+id/scrollView"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@+id/scrollView"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content"
 	android:orientation="vertical">
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
 		android:padding="@dimen/margin_large">
@@ -25,7 +24,7 @@
 			app:layout_constraintBottom_toTopOf="@id/explanationImage"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toTopOf="parent"/>
+			app:layout_constraintTop_toTopOf="parent" />
 
 		<ImageView
 			android:id="@+id/explanationImage"
@@ -33,15 +32,15 @@
 			android:layout_height="wrap_content"
 			android:adjustViewBounds="true"
 			android:paddingLeft="@dimen/margin_large"
-			android:paddingRight="@dimen/margin_large"
 			android:paddingTop="@dimen/margin_large"
+			android:paddingRight="@dimen/margin_large"
 			android:scaleType="fitCenter"
 			android:src="@drawable/qr_code_explanation"
 			app:layout_constraintBottom_toTopOf="@id/explanationText"
 			app:layout_constraintEnd_toEndOf="@id/diagram"
 			app:layout_constraintStart_toStartOf="@id/diagram"
 			app:layout_constraintTop_toBottomOf="@id/diagram"
-			tools:ignore="ContentDescription"/>
+			tools:ignore="ContentDescription" />
 
 		<TextView
 			android:id="@+id/explanationText"
@@ -52,7 +51,7 @@
 			app:layout_constrainedWidth="true"
 			app:layout_constraintEnd_toEndOf="@id/explanationImage"
 			app:layout_constraintStart_toStartOf="@id/explanationImage"
-			app:layout_constraintTop_toBottomOf="@id/explanationImage"/>
+			app:layout_constraintTop_toBottomOf="@id/explanationImage" />
 
 		<View
 			android:id="@+id/explanationBorder"
@@ -62,7 +61,7 @@
 			app:layout_constraintBottom_toBottomOf="@id/explanationText"
 			app:layout_constraintEnd_toEndOf="@id/explanationImage"
 			app:layout_constraintStart_toStartOf="@id/explanationImage"
-			app:layout_constraintTop_toTopOf="@id/explanationImage"/>
+			app:layout_constraintTop_toTopOf="@id/explanationImage" />
 
 		<Button
 			android:id="@+id/continueButton"
@@ -74,8 +73,8 @@
 			app:layout_constraintBottom_toBottomOf="parent"
 			app:layout_constraintEnd_toEndOf="@id/explanationImage"
 			app:layout_constraintStart_toStartOf="@id/explanationImage"
-			app:layout_constraintTop_toBottomOf="@id/explanationText"/>
+			app:layout_constraintTop_toBottomOf="@id/explanationText" />
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 
 </ScrollView>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/fragment_keyagreement_qr.xml b/briar-android/src/main/res/layout/fragment_keyagreement_qr.xml
index b267079be..33227017d 100644
--- a/briar-android/src/main/res/layout/fragment_keyagreement_qr.xml
+++ b/briar-android/src/main/res/layout/fragment_keyagreement_qr.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<FrameLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
@@ -9,7 +8,7 @@
 	<org.briarproject.briar.android.keyagreement.CameraView
 		android:id="@+id/camera_view"
 		android:layout_width="match_parent"
-		android:layout_height="match_parent"/>
+		android:layout_height="match_parent" />
 
 	<LinearLayout
 		android:id="@+id/camera_overlay"
@@ -32,7 +31,7 @@
 			<ProgressBar
 				style="?android:attr/progressBarStyleLarge"
 				android:layout_width="wrap_content"
-				android:layout_height="wrap_content"/>
+				android:layout_height="wrap_content" />
 
 			<TextView
 				android:id="@+id/connect_status"
@@ -40,7 +39,7 @@
 				android:layout_height="wrap_content"
 				android:gravity="center"
 				android:paddingTop="@dimen/margin_large"
-				tools:text="@string/waiting_for_contact_to_scan"/>
+				tools:text="@string/waiting_for_contact_to_scan" />
 		</LinearLayout>
 
 		<org.briarproject.briar.android.view.QrCodeView
@@ -49,7 +48,7 @@
 			android:layout_height="0dp"
 			android:layout_weight="1"
 			android:background="@android:color/white"
-			tools:visibility="visible"/>
+			tools:visibility="visible" />
 
 	</LinearLayout>
 
diff --git a/briar-android/src/main/res/layout/fragment_link_dialog.xml b/briar-android/src/main/res/layout/fragment_link_dialog.xml
index abc0b7818..7199bbc14 100644
--- a/briar-android/src/main/res/layout/fragment_link_dialog.xml
+++ b/briar-android/src/main/res/layout/fragment_link_dialog.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -10,11 +9,11 @@
 		android:id="@+id/linkWarning"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="16dp"
-		android:layout_marginLeft="16dp"
-		android:layout_marginRight="16dp"
 		android:layout_marginStart="16dp"
+		android:layout_marginLeft="16dp"
 		android:layout_marginTop="16dp"
+		android:layout_marginEnd="16dp"
+		android:layout_marginRight="16dp"
 		android:text="@string/link_warning_title"
 		android:textColor="?android:attr/textColorPrimary"
 		android:textSize="@dimen/text_size_large"
@@ -24,17 +23,17 @@
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
 		app:layout_constraintVertical_bias="0.0"
-		app:layout_constraintVertical_chainStyle="packed"/>
+		app:layout_constraintVertical_chainStyle="packed" />
 
 	<ScrollView
 		android:id="@+id/scrollView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="16dp"
-		android:layout_marginLeft="16dp"
-		android:layout_marginRight="16dp"
 		android:layout_marginStart="16dp"
+		android:layout_marginLeft="16dp"
 		android:layout_marginTop="16dp"
+		android:layout_marginEnd="16dp"
+		android:layout_marginRight="16dp"
 		app:layout_constrainedHeight="true"
 		app:layout_constraintBottom_toTopOf="@+id/cancelButton"
 		app:layout_constraintEnd_toEndOf="parent"
@@ -52,22 +51,22 @@
 				android:layout_height="wrap_content"
 				android:text="@string/link_warning_intro"
 				android:textColor="?android:attr/textColorPrimary"
-				android:textSize="@dimen/text_size_medium"/>
+				android:textSize="@dimen/text_size_medium" />
 
 			<TextView
 				android:id="@+id/urlView"
 				android:layout_width="match_parent"
 				android:layout_height="wrap_content"
 				android:layout_gravity="center_vertical"
-				android:layout_marginBottom="16dp"
 				android:layout_marginTop="16dp"
+				android:layout_marginBottom="16dp"
 				android:background="@color/briar_white"
 				android:padding="8dp"
 				android:textColor="@color/briar_text_primary"
 				android:textIsSelectable="true"
 				android:textSize="@dimen/text_size_medium"
 				android:typeface="monospace"
-				tools:text="http://very.bad.site.com/with/a/super/long/address/that/can/push/stuff/off/screen/so/much/that/buttons/are/not/visible/which/is/bad/for/users/when/they/dont/know/what/to/do/they/might/be/completely/lost/crying/in/despair/so/we/need/to/make/sure/that/they/see/all/buttons"/>
+				tools:text="http://very.bad.site.com/with/a/super/long/address/that/can/push/stuff/off/screen/so/much/that/buttons/are/not/visible/which/is/bad/for/users/when/they/dont/know/what/to/do/they/might/be/completely/lost/crying/in/despair/so/we/need/to/make/sure/that/they/see/all/buttons" />
 
 			<TextView
 				android:id="@+id/thinkBeforeOpen"
@@ -75,7 +74,7 @@
 				android:layout_height="wrap_content"
 				android:text="@string/link_warning_text"
 				android:textColor="?android:attr/textColorPrimary"
-				android:textSize="@dimen/text_size_medium"/>
+				android:textSize="@dimen/text_size_medium" />
 
 		</LinearLayout>
 
@@ -93,7 +92,7 @@
 		app:layout_constraintHorizontal_chainStyle="packed"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/scrollView"
-		app:layout_constraintVertical_bias="1.0"/>
+		app:layout_constraintVertical_bias="1.0" />
 
 	<Button
 		android:id="@+id/openButton"
@@ -104,6 +103,6 @@
 		app:layout_constraintBottom_toBottomOf="parent"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toEndOf="@+id/cancelButton"
-		app:layout_constraintTop_toTopOf="@+id/cancelButton"/>
+		app:layout_constraintTop_toTopOf="@+id/cancelButton" />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/briar-android/src/main/res/layout/fragment_link_exchange.xml b/briar-android/src/main/res/layout/fragment_link_exchange.xml
index 339fff186..857c85721 100644
--- a/briar-android/src/main/res/layout/fragment_link_exchange.xml
+++ b/briar-android/src/main/res/layout/fragment_link_exchange.xml
@@ -1,23 +1,22 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	android:fillViewport="true">
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
 		android:padding="@dimen/margin_large">
 
-		<android.support.constraint.Guideline
+		<androidx.constraintlayout.widget.Guideline
 			android:id="@+id/guideline"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
 			android:orientation="vertical"
-			app:layout_constraintGuide_percent="0.5"/>
+			app:layout_constraintGuide_percent="0.5" />
 
 		<TextView
 			android:id="@+id/stepOne"
@@ -27,7 +26,7 @@
 			app:layout_constraintEnd_toStartOf="@+id/guideline"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toTopOf="parent"
-			app:layout_constraintVertical_bias="0.0"/>
+			app:layout_constraintVertical_bias="0.0" />
 
 		<TextView
 			android:id="@+id/stepOneText"
@@ -38,7 +37,7 @@
 			app:layout_constraintBottom_toTopOf="@+id/yourLinkIcon"
 			app:layout_constraintEnd_toStartOf="@+id/guideline"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/stepOne"/>
+			app:layout_constraintTop_toBottomOf="@+id/stepOne" />
 
 		<View
 			android:id="@+id/stepConnector"
@@ -50,7 +49,7 @@
 			app:layout_constraintBottom_toBottomOf="@+id/stepOne"
 			app:layout_constraintEnd_toStartOf="@+id/stepTwo"
 			app:layout_constraintStart_toEndOf="@+id/stepOne"
-			app:layout_constraintTop_toTopOf="@+id/stepOne"/>
+			app:layout_constraintTop_toTopOf="@+id/stepOne" />
 
 		<TextView
 			android:id="@+id/stepTwo"
@@ -61,7 +60,7 @@
 			app:layout_constraintStart_toStartOf="@+id/guideline"
 			app:layout_constraintTop_toTopOf="@+id/stepOne"
 			app:layout_constraintVertical_bias="0.0"
-			app:layout_constraintVertical_chainStyle="packed"/>
+			app:layout_constraintVertical_chainStyle="packed" />
 
 		<TextView
 			android:id="@+id/stepTwoText"
@@ -73,9 +72,9 @@
 			app:layout_constraintBottom_toTopOf="@+id/yourLinkIcon"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toEndOf="@+id/guideline"
-			app:layout_constraintTop_toBottomOf="@+id/stepTwo"/>
+			app:layout_constraintTop_toBottomOf="@+id/stepTwo" />
 
-		<android.support.v7.widget.AppCompatImageView
+		<androidx.appcompat.widget.AppCompatImageView
 			android:id="@+id/yourLinkIcon"
 			android:layout_width="38dp"
 			android:layout_height="38dp"
@@ -85,21 +84,21 @@
 			android:src="@drawable/ic_call_made"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/stepOneText"
-			app:tint="@color/briar_white"/>
+			app:tint="@color/briar_white" />
 
 		<TextView
 			android:id="@+id/yourLink"
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
-			android:layout_marginLeft="8dp"
 			android:layout_marginStart="8dp"
+			android:layout_marginLeft="8dp"
 			android:gravity="left|start"
 			android:text="@string/your_link"
 			android:textSize="16sp"
 			app:layout_constraintBottom_toBottomOf="@+id/yourLinkIcon"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toEndOf="@+id/yourLinkIcon"
-			app:layout_constraintTop_toTopOf="@+id/yourLinkIcon"/>
+			app:layout_constraintTop_toTopOf="@+id/yourLinkIcon" />
 
 		<TextView
 			android:id="@+id/linkView"
@@ -117,41 +116,41 @@
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/yourLinkIcon"
-			tools:text="briar://scnsdflamslkfjgluoblmksdfbwevlewajfdlkjewwhqliafskfjhskdjhvoieiv"/>
+			tools:text="briar://scnsdflamslkfjgluoblmksdfbwevlewajfdlkjewwhqliafskfjhskdjhvoieiv" />
 
 		<Button
 			android:id="@+id/copyButton"
 			style="@style/BriarButtonFlat.Positive.Tiny"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
+			android:drawableStart="@drawable/ic_content_copy"
 			android:drawableLeft="@drawable/ic_content_copy"
 			android:drawablePadding="8dp"
-			android:drawableStart="@drawable/ic_content_copy"
 			android:enabled="false"
 			android:text="@string/copy_button"
 			app:layout_constraintEnd_toStartOf="@id/shareButton"
 			app:layout_constraintHorizontal_bias="1.0"
 			app:layout_constraintHorizontal_chainStyle="packed"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/linkView"/>
+			app:layout_constraintTop_toBottomOf="@+id/linkView" />
 
 		<Button
 			android:id="@+id/shareButton"
 			style="@style/BriarButtonFlat.Positive.Tiny"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
+			android:drawableStart="@drawable/social_share_blue"
 			android:drawableLeft="@drawable/social_share_blue"
 			android:drawablePadding="8dp"
-			android:drawableStart="@drawable/social_share_blue"
 			android:enabled="false"
 			android:text="@string/share_button"
 			app:layout_constraintBottom_toBottomOf="@id/copyButton"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintHorizontal_bias="1.0"
 			app:layout_constraintStart_toEndOf="@id/copyButton"
-			app:layout_constraintTop_toTopOf="@id/copyButton"/>
+			app:layout_constraintTop_toTopOf="@id/copyButton" />
 
-		<android.support.v7.widget.AppCompatImageView
+		<androidx.appcompat.widget.AppCompatImageView
 			android:id="@+id/linkInputIcon"
 			android:layout_width="38dp"
 			android:layout_height="38dp"
@@ -161,23 +160,23 @@
 			android:src="@drawable/ic_call_received"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/copyButton"
-			app:tint="@color/briar_white"/>
+			app:tint="@color/briar_white" />
 
 		<TextView
 			android:id="@+id/inputLink"
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
-			android:layout_marginLeft="8dp"
 			android:layout_marginStart="8dp"
+			android:layout_marginLeft="8dp"
 			android:gravity="left|start"
 			android:text="@string/contact_link_intro"
 			android:textSize="16sp"
 			app:layout_constraintBottom_toBottomOf="@+id/linkInputIcon"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toEndOf="@+id/linkInputIcon"
-			app:layout_constraintTop_toTopOf="@+id/linkInputIcon"/>
+			app:layout_constraintTop_toTopOf="@+id/linkInputIcon" />
 
-		<android.support.design.widget.TextInputLayout
+		<com.google.android.material.textfield.TextInputLayout
 			android:id="@+id/linkInputLayout"
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
@@ -188,30 +187,30 @@
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/linkInputIcon">
 
-			<android.support.design.widget.TextInputEditText
+			<com.google.android.material.textfield.TextInputEditText
 				android:id="@+id/linkInput"
 				android:layout_width="match_parent"
 				android:layout_height="match_parent"
 				android:hint="@string/contact_link_hint"
 				android:importantForAutofill="no"
-				android:inputType="textUri"/>
+				android:inputType="textUri" />
 
-		</android.support.design.widget.TextInputLayout>
+		</com.google.android.material.textfield.TextInputLayout>
 
 		<Button
 			android:id="@+id/pasteButton"
 			style="@style/BriarButtonFlat.Positive.Tiny"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
+			android:drawableStart="@drawable/ic_content_paste"
 			android:drawableLeft="@drawable/ic_content_paste"
 			android:drawablePadding="8dp"
-			android:drawableStart="@drawable/ic_content_paste"
 			android:text="@string/paste_button"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintHorizontal_bias="1.0"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/linkInputLayout"
-			app:layout_constraintVertical_bias="0.0"/>
+			app:layout_constraintVertical_bias="0.0" />
 
 		<Button
 			android:id="@+id/addButton"
@@ -227,8 +226,8 @@
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/pasteButton"
 			app:layout_constraintVertical_bias="1.0"
-			tools:enabled="true"/>
+			tools:enabled="true" />
 
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 </ScrollView>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/fragment_message.xml b/briar-android/src/main/res/layout/fragment_message.xml
index b9061e7ef..a1c0df5be 100644
--- a/briar-android/src/main/res/layout/fragment_message.xml
+++ b/briar-android/src/main/res/layout/fragment_message.xml
@@ -1,11 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
-<org.briarproject.briar.android.view.LargeTextInputView
-	android:id="@+id/messageView"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<org.briarproject.briar.android.view.LargeTextInputView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
+	android:id="@+id/messageView"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	app:allowEmptyText="true"
 	app:buttonText="@string/forum_share_button"
 	app:fillHeight="true"
-	app:hint="@string/forum_share_message"/>
\ No newline at end of file
+	app:hint="@string/forum_share_message" />
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/fragment_nickname.xml b/briar-android/src/main/res/layout/fragment_nickname.xml
index 887e4c898..237ceff1d 100644
--- a/briar-android/src/main/res/layout/fragment_nickname.xml
+++ b/briar-android/src/main/res/layout/fragment_nickname.xml
@@ -1,25 +1,24 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	android:fillViewport="true">
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
 		android:padding="@dimen/margin_large">
 
-		<android.support.constraint.Guideline
+		<androidx.constraintlayout.widget.Guideline
 			android:id="@+id/guideline"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
 			android:orientation="vertical"
-			app:layout_constraintGuide_percent="0.5"/>
+			app:layout_constraintGuide_percent="0.5" />
 
-		<android.support.v7.widget.AppCompatImageView
+		<androidx.appcompat.widget.AppCompatImageView
 			android:id="@+id/stepOne"
 			style="@style/StepBubble.Completed"
 			app:layout_constraintBottom_toTopOf="@+id/stepOneText"
@@ -27,7 +26,7 @@
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toTopOf="parent"
 			app:layout_constraintVertical_bias="0.0"
-			app:layout_constraintVertical_chainStyle="packed"/>
+			app:layout_constraintVertical_chainStyle="packed" />
 
 		<TextView
 			android:id="@+id/stepOneText"
@@ -38,7 +37,7 @@
 			app:layout_constraintBottom_toTopOf="@+id/imageView"
 			app:layout_constraintEnd_toStartOf="@+id/guideline"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/stepOne"/>
+			app:layout_constraintTop_toBottomOf="@+id/stepOne" />
 
 		<View
 			android:id="@+id/stepConnector"
@@ -49,7 +48,7 @@
 			app:layout_constraintBottom_toBottomOf="@+id/stepOne"
 			app:layout_constraintEnd_toStartOf="@+id/stepTwo"
 			app:layout_constraintStart_toEndOf="@+id/stepOne"
-			app:layout_constraintTop_toTopOf="@+id/stepOne"/>
+			app:layout_constraintTop_toTopOf="@+id/stepOne" />
 
 		<TextView
 			android:id="@+id/stepTwo"
@@ -60,7 +59,7 @@
 			app:layout_constraintStart_toStartOf="@+id/guideline"
 			app:layout_constraintTop_toTopOf="@+id/stepOne"
 			app:layout_constraintVertical_bias="0.0"
-			app:layout_constraintVertical_chainStyle="packed"/>
+			app:layout_constraintVertical_chainStyle="packed" />
 
 		<TextView
 			android:id="@+id/stepTwoText"
@@ -71,7 +70,7 @@
 			app:layout_constraintBottom_toTopOf="@+id/imageView"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toEndOf="@+id/guideline"
-			app:layout_constraintTop_toBottomOf="@+id/stepTwo"/>
+			app:layout_constraintTop_toBottomOf="@+id/stepTwo" />
 
 		<ImageView
 			android:id="@+id/imageView"
@@ -85,9 +84,9 @@
 			app:layout_constraintHeight_max="256dp"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/stepOneText"
-			tools:ignore="ContentDescription"/>
+			tools:ignore="ContentDescription" />
 
-		<android.support.v7.widget.AppCompatImageView
+		<androidx.appcompat.widget.AppCompatImageView
 			android:id="@+id/nicknameIcon"
 			android:layout_width="38dp"
 			android:layout_height="38dp"
@@ -98,23 +97,23 @@
 			app:layout_constraintBottom_toTopOf="@+id/contactNameLayout"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/imageView"
-			app:tint="@color/briar_white"/>
+			app:tint="@color/briar_white" />
 
 		<TextView
 			android:id="@+id/nicknameIntro"
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
-			android:layout_marginLeft="8dp"
 			android:layout_marginStart="8dp"
+			android:layout_marginLeft="8dp"
 			android:gravity="left|start"
 			android:text="@string/nickname_intro"
 			android:textSize="16sp"
 			app:layout_constraintBottom_toBottomOf="@+id/nicknameIcon"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toEndOf="@+id/nicknameIcon"
-			app:layout_constraintTop_toTopOf="@+id/nicknameIcon"/>
+			app:layout_constraintTop_toTopOf="@+id/nicknameIcon" />
 
-		<android.support.design.widget.TextInputLayout
+		<com.google.android.material.textfield.TextInputLayout
 			android:id="@+id/contactNameLayout"
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
@@ -127,15 +126,15 @@
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/nicknameIcon">
 
-			<android.support.design.widget.TextInputEditText
+			<com.google.android.material.textfield.TextInputEditText
 				android:id="@+id/contactNameInput"
 				android:layout_width="match_parent"
 				android:layout_height="match_parent"
 				android:hint="@string/add_contact_choose_a_nickname"
 				android:importantForAutofill="no"
-				android:inputType="text|textCapWords"/>
+				android:inputType="text|textCapWords" />
 
-		</android.support.design.widget.TextInputLayout>
+		</com.google.android.material.textfield.TextInputLayout>
 
 		<Space
 			android:id="@+id/space"
@@ -145,7 +144,7 @@
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintHeight_default="wrap"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/contactNameLayout"/>
+			app:layout_constraintTop_toBottomOf="@+id/contactNameLayout" />
 
 		<Button
 			android:id="@+id/addButton"
@@ -157,7 +156,7 @@
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/contactNameLayout"
-			app:layout_constraintVertical_bias="1.0"/>
+			app:layout_constraintVertical_bias="1.0" />
 
 		<ProgressBar
 			android:id="@+id/progressBar"
@@ -170,8 +169,8 @@
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/contactNameLayout"
-			app:layout_constraintVertical_bias="1.0"/>
+			app:layout_constraintVertical_bias="1.0" />
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 
 </ScrollView>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/fragment_open_database.xml b/briar-android/src/main/res/layout/fragment_open_database.xml
index 6009ab6bc..1d7dba9e4 100644
--- a/briar-android/src/main/res/layout/fragment_open_database.xml
+++ b/briar-android/src/main/res/layout/fragment_open_database.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -19,7 +18,7 @@
 		app:layout_constraintTop_toTopOf="parent"
 		app:layout_constraintVertical_bias="0.5"
 		app:layout_constraintVertical_chainStyle="packed"
-		tools:ignore="ContentDescription"/>
+		tools:ignore="ContentDescription" />
 
 	<ProgressBar
 		android:id="@+id/progressBar"
@@ -29,7 +28,7 @@
 		app:layout_constraintBottom_toBottomOf="@+id/imageView"
 		app:layout_constraintEnd_toEndOf="@+id/imageView"
 		app:layout_constraintStart_toStartOf="@+id/imageView"
-		app:layout_constraintTop_toTopOf="@+id/imageView"/>
+		app:layout_constraintTop_toTopOf="@+id/imageView" />
 
 	<TextView
 		android:id="@+id/textView"
@@ -44,6 +43,6 @@
 		app:layout_constraintBottom_toBottomOf="parent"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
-		app:layout_constraintTop_toBottomOf="@+id/imageView"/>
+		app:layout_constraintTop_toBottomOf="@+id/imageView" />
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/fragment_password.xml b/briar-android/src/main/res/layout/fragment_password.xml
index 46472ec7b..484c53f52 100644
--- a/briar-android/src/main/res/layout/fragment_password.xml
+++ b/briar-android/src/main/res/layout/fragment_password.xml
@@ -1,18 +1,17 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	tools:context=".android.login.PasswordFragment">
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
 		android:padding="@dimen/margin_activity_vertical">
 
-		<android.support.design.widget.TextInputLayout
+		<com.google.android.material.textfield.TextInputLayout
 			android:id="@+id/password_layout"
 			android:layout_width="match_parent"
 			android:layout_height="wrap_content"
@@ -23,18 +22,18 @@
 			app:layout_constraintTop_toTopOf="parent"
 			app:passwordToggleEnabled="true">
 
-			<android.support.design.widget.TextInputEditText
+			<com.google.android.material.textfield.TextInputEditText
 				android:id="@+id/edit_password"
 				android:layout_width="match_parent"
 				android:layout_height="wrap_content"
 				android:hint="@string/enter_password"
 				android:imeOptions="actionDone"
 				android:inputType="textPassword"
-				android:maxLines="1"/>
+				android:maxLines="1" />
 
-			<requestFocus/>
+			<requestFocus />
 
-		</android.support.design.widget.TextInputLayout>
+		</com.google.android.material.textfield.TextInputLayout>
 
 		<Button
 			android:id="@+id/btn_sign_in"
@@ -45,7 +44,7 @@
 			android:text="@string/sign_in_button"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@id/password_layout"/>
+			app:layout_constraintTop_toBottomOf="@id/password_layout" />
 
 		<ProgressBar
 			android:id="@+id/progress_wheel"
@@ -55,7 +54,7 @@
 			app:layout_constraintBottom_toBottomOf="@+id/btn_sign_in"
 			app:layout_constraintLeft_toLeftOf="parent"
 			app:layout_constraintRight_toRightOf="parent"
-			app:layout_constraintTop_toTopOf="@id/btn_sign_in"/>
+			app:layout_constraintTop_toTopOf="@id/btn_sign_in" />
 
 		<TextView
 			android:id="@+id/btn_forgotten"
@@ -68,8 +67,8 @@
 			android:textColor="?android:attr/textColorLink"
 			app:layout_constraintLeft_toLeftOf="parent"
 			app:layout_constraintRight_toRightOf="parent"
-			app:layout_constraintTop_toBottomOf="@id/btn_sign_in"/>
+			app:layout_constraintTop_toBottomOf="@id/btn_sign_in" />
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 
 </ScrollView>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/fragment_reblog.xml b/briar-android/src/main/res/layout/fragment_reblog.xml
index 2cfa7e5f5..bc67e4b29 100644
--- a/briar-android/src/main/res/layout/fragment_reblog.xml
+++ b/briar-android/src/main/res/layout/fragment_reblog.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
@@ -21,14 +20,14 @@
 				layout="@layout/list_item_blog_post"
 				android:layout_width="match_parent"
 				android:layout_height="wrap_content"
-				android:layout_margin="@dimen/margin_small"/>
+				android:layout_margin="@dimen/margin_small" />
 
 			<ProgressBar
 				android:id="@+id/progressBar"
 				style="?android:attr/progressBarStyleLarge"
 				android:layout_width="wrap_content"
 				android:layout_height="wrap_content"
-				android:layout_centerInParent="true"/>
+				android:layout_centerInParent="true" />
 
 		</RelativeLayout>
 
@@ -42,6 +41,6 @@
 		app:allowEmptyText="true"
 		app:buttonText="@string/blogs_reblog_button"
 		app:hint="@string/blogs_reblog_comment_hint"
-		app:maxLines="5"/>
+		app:maxLines="5" />
 
 </LinearLayout>
diff --git a/briar-android/src/main/res/layout/fragment_report_form.xml b/briar-android/src/main/res/layout/fragment_report_form.xml
index 810268949..cbff42b61 100644
--- a/briar-android/src/main/res/layout/fragment_report_form.xml
+++ b/briar-android/src/main/res/layout/fragment_report_form.xml
@@ -1,75 +1,74 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	android:fillViewport="true">
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content">
 
-		<android.support.design.widget.TextInputLayout
+		<com.google.android.material.textfield.TextInputLayout
 			android:id="@+id/user_comment_layout"
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
-			android:layout_marginEnd="@dimen/margin_large"
-			android:layout_marginLeft="@dimen/margin_large"
-			android:layout_marginRight="@dimen/margin_large"
 			android:layout_marginStart="@dimen/margin_large"
+			android:layout_marginLeft="@dimen/margin_large"
 			android:layout_marginTop="@dimen/margin_large"
+			android:layout_marginEnd="@dimen/margin_large"
+			android:layout_marginRight="@dimen/margin_large"
 			app:hintEnabled="false"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toTopOf="parent">
 
-			<android.support.design.widget.TextInputEditText
+			<com.google.android.material.textfield.TextInputEditText
 				android:id="@+id/user_comment"
 				android:layout_width="match_parent"
 				android:layout_height="wrap_content"
 				android:inputType="textMultiLine|textCapSentences"
 				android:maxLines="5"
-				tools:hint="@string/describe_crash"/>
+				tools:hint="@string/describe_crash" />
 
-		</android.support.design.widget.TextInputLayout>
+		</com.google.android.material.textfield.TextInputLayout>
 
-		<android.support.design.widget.TextInputLayout
+		<com.google.android.material.textfield.TextInputLayout
 			android:id="@+id/user_email_layout"
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
-			android:layout_marginEnd="@dimen/margin_large"
-			android:layout_marginLeft="@dimen/margin_large"
-			android:layout_marginRight="@dimen/margin_large"
 			android:layout_marginStart="@dimen/margin_large"
+			android:layout_marginLeft="@dimen/margin_large"
+			android:layout_marginEnd="@dimen/margin_large"
+			android:layout_marginRight="@dimen/margin_large"
 			app:hintEnabled="false"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/user_comment_layout">
 
-			<android.support.design.widget.TextInputEditText
+			<com.google.android.material.textfield.TextInputEditText
 				android:id="@+id/user_email"
 				android:layout_width="match_parent"
 				android:layout_height="wrap_content"
 				android:hint="@string/optional_contact_email"
 				android:inputType="textEmailAddress"
-				android:maxLines="1"/>
+				android:maxLines="1" />
 
-		</android.support.design.widget.TextInputLayout>
+		</com.google.android.material.textfield.TextInputLayout>
 
 		<CheckBox
 			android:id="@+id/include_debug_report"
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
-			android:layout_marginLeft="@dimen/margin_large"
 			android:layout_marginStart="@dimen/margin_large"
+			android:layout_marginLeft="@dimen/margin_large"
 			android:checked="false"
 			android:text="@string/include_debug_report_crash"
 			app:layout_constraintBottom_toBottomOf="@+id/chevron"
 			app:layout_constraintEnd_toStartOf="@+id/chevron"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toTopOf="@+id/chevron"/>
+			app:layout_constraintTop_toTopOf="@+id/chevron" />
 
 		<Button
 			android:id="@+id/chevron"
@@ -78,7 +77,7 @@
 			android:layout_height="wrap_content"
 			android:text="@string/show"
 			app:layout_constraintEnd_toEndOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/user_email_layout"/>
+			app:layout_constraintTop_toBottomOf="@+id/user_email_layout" />
 
 		<LinearLayout
 			android:id="@+id/report_content"
@@ -86,14 +85,14 @@
 			android:layout_height="wrap_content"
 			android:gravity="center_horizontal"
 			android:orientation="vertical"
-			android:paddingBottom="@dimen/listitem_height_one_line_avatar"
-			android:paddingEnd="@dimen/margin_large"
 			android:paddingStart="@dimen/margin_large"
 			android:paddingTop="@dimen/margin_small"
+			android:paddingEnd="@dimen/margin_large"
+			android:paddingBottom="@dimen/listitem_height_one_line_avatar"
 			android:visibility="gone"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@id/include_debug_report"
-			tools:visibility="visible"/>
+			tools:visibility="visible" />
 
 		<ProgressBar
 			android:id="@+id/progress_wheel"
@@ -106,8 +105,8 @@
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/include_debug_report"
-			tools:visibility="visible"/>
+			tools:visibility="visible" />
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 
 </ScrollView>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/fragment_setup_author_name.xml b/briar-android/src/main/res/layout/fragment_setup_author_name.xml
index ef85fbdcf..2b644cd45 100644
--- a/briar-android/src/main/res/layout/fragment_setup_author_name.xml
+++ b/briar-android/src/main/res/layout/fragment_setup_author_name.xml
@@ -1,23 +1,22 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	android:fillViewport="true">
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
-		android:paddingBottom="@dimen/margin_activity_vertical"
-		android:paddingEnd="@dimen/margin_activity_horizontal"
-		android:paddingLeft="@dimen/margin_activity_horizontal"
-		android:paddingRight="@dimen/margin_activity_horizontal"
 		android:paddingStart="@dimen/margin_activity_horizontal"
-		android:paddingTop="@dimen/margin_activity_vertical">
+		android:paddingLeft="@dimen/margin_activity_horizontal"
+		android:paddingTop="@dimen/margin_activity_vertical"
+		android:paddingEnd="@dimen/margin_activity_horizontal"
+		android:paddingRight="@dimen/margin_activity_horizontal"
+		android:paddingBottom="@dimen/margin_activity_vertical">
 
-		<android.support.design.widget.TextInputLayout
+		<com.google.android.material.textfield.TextInputLayout
 			android:id="@+id/nickname_entry_wrapper"
 			android:layout_width="match_parent"
 			android:layout_height="wrap_content"
@@ -28,18 +27,18 @@
 			app:layout_constraintRight_toRightOf="parent"
 			app:layout_constraintTop_toTopOf="parent">
 
-			<android.support.design.widget.TextInputEditText
+			<com.google.android.material.textfield.TextInputEditText
 				android:id="@+id/nickname_entry"
 				android:layout_width="match_parent"
 				android:layout_height="wrap_content"
 				android:hint="@string/choose_nickname"
 				android:imeOptions="actionNext"
 				android:inputType="text|textCapWords"
-				android:maxLines="1"/>
+				android:maxLines="1" />
 
-			<requestFocus/>
+			<requestFocus />
 
-		</android.support.design.widget.TextInputLayout>
+		</com.google.android.material.textfield.TextInputLayout>
 
 		<Button
 			android:id="@+id/next"
@@ -54,8 +53,8 @@
 			app:layout_constraintRight_toRightOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/nickname_entry_wrapper"
 			app:layout_constraintVertical_bias="1.0"
-			tools:enabled="true"/>
+			tools:enabled="true" />
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 
 </ScrollView>
diff --git a/briar-android/src/main/res/layout/fragment_setup_doze.xml b/briar-android/src/main/res/layout/fragment_setup_doze.xml
index 5a55450ad..0a5c03f14 100644
--- a/briar-android/src/main/res/layout/fragment_setup_doze.xml
+++ b/briar-android/src/main/res/layout/fragment_setup_doze.xml
@@ -1,13 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	android:fillViewport="true">
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
 		android:padding="@dimen/margin_activity_vertical">
@@ -18,7 +17,7 @@
 			android:layout_height="wrap_content"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toTopOf="parent"/>
+			app:layout_constraintTop_toTopOf="parent" />
 
 		<org.briarproject.briar.android.account.HuaweiView
 			android:id="@+id/huaweiView"
@@ -26,7 +25,7 @@
 			android:layout_height="wrap_content"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/dozeView"/>
+			app:layout_constraintTop_toBottomOf="@+id/dozeView" />
 
 		<Button
 			android:id="@+id/next"
@@ -40,7 +39,7 @@
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/huaweiView"
 			app:layout_constraintVertical_bias="1.0"
-			tools:enabled="true"/>
+			tools:enabled="true" />
 
 		<ProgressBar
 			android:id="@+id/progress"
@@ -51,8 +50,8 @@
 			app:layout_constraintBottom_toBottomOf="@+id/next"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toTopOf="@+id/next"/>
+			app:layout_constraintTop_toTopOf="@+id/next" />
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 
 </ScrollView>
diff --git a/briar-android/src/main/res/layout/fragment_setup_password.xml b/briar-android/src/main/res/layout/fragment_setup_password.xml
index 1cb67b7f0..1f8dc05f9 100644
--- a/briar-android/src/main/res/layout/fragment_setup_password.xml
+++ b/briar-android/src/main/res/layout/fragment_setup_password.xml
@@ -1,23 +1,22 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	android:fillViewport="true">
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
-		android:paddingBottom="@dimen/margin_activity_vertical"
-		android:paddingEnd="@dimen/margin_activity_horizontal"
-		android:paddingLeft="@dimen/margin_activity_horizontal"
-		android:paddingRight="@dimen/margin_activity_horizontal"
 		android:paddingStart="@dimen/margin_activity_horizontal"
-		android:paddingTop="@dimen/margin_activity_vertical">
+		android:paddingLeft="@dimen/margin_activity_horizontal"
+		android:paddingTop="@dimen/margin_activity_vertical"
+		android:paddingEnd="@dimen/margin_activity_horizontal"
+		android:paddingRight="@dimen/margin_activity_horizontal"
+		android:paddingBottom="@dimen/margin_activity_vertical">
 
-		<android.support.design.widget.TextInputLayout
+		<com.google.android.material.textfield.TextInputLayout
 			android:id="@+id/password_entry_wrapper"
 			android:layout_width="match_parent"
 			android:layout_height="wrap_content"
@@ -29,7 +28,7 @@
 			app:layout_constraintTop_toTopOf="parent"
 			app:passwordToggleEnabled="true">
 
-			<android.support.design.widget.TextInputEditText
+			<com.google.android.material.textfield.TextInputEditText
 				android:id="@+id/password_entry"
 				android:layout_width="match_parent"
 				android:layout_height="wrap_content"
@@ -38,11 +37,11 @@
 				android:inputType="textPassword"
 				android:maxLines="1">
 
-				<requestFocus/>
+				<requestFocus />
 
-			</android.support.design.widget.TextInputEditText>
+			</com.google.android.material.textfield.TextInputEditText>
 
-		</android.support.design.widget.TextInputLayout>
+		</com.google.android.material.textfield.TextInputLayout>
 
 		<org.briarproject.briar.android.login.StrengthMeter
 			android:id="@+id/strength_meter"
@@ -53,9 +52,9 @@
 			app:layout_constraintLeft_toLeftOf="parent"
 			app:layout_constraintRight_toRightOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/password_entry_wrapper"
-			tools:visibility="visible"/>
+			tools:visibility="visible" />
 
-		<android.support.design.widget.TextInputLayout
+		<com.google.android.material.textfield.TextInputLayout
 			android:id="@+id/password_confirm_wrapper"
 			android:layout_width="match_parent"
 			android:layout_height="wrap_content"
@@ -67,15 +66,15 @@
 			app:layout_constraintTop_toBottomOf="@+id/strength_meter"
 			app:passwordToggleEnabled="true">
 
-			<android.support.design.widget.TextInputEditText
+			<com.google.android.material.textfield.TextInputEditText
 				android:id="@+id/password_confirm"
 				android:layout_width="match_parent"
 				android:layout_height="wrap_content"
 				android:hint="@string/confirm_password"
 				android:imeOptions="actionNext"
 				android:inputType="textPassword"
-				android:maxLines="1"/>
-		</android.support.design.widget.TextInputLayout>
+				android:maxLines="1" />
+		</com.google.android.material.textfield.TextInputLayout>
 
 		<Button
 			android:id="@+id/next"
@@ -89,7 +88,7 @@
 			app:layout_constraintRight_toRightOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/password_confirm_wrapper"
 			app:layout_constraintVertical_bias="1.0"
-			tools:enabled="true"/>
+			tools:enabled="true" />
 
 		<ProgressBar
 			android:id="@+id/progress"
@@ -101,8 +100,8 @@
 			app:layout_constraintLeft_toLeftOf="parent"
 			app:layout_constraintRight_toRightOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/password_confirm_wrapper"
-			app:layout_constraintVertical_bias="1.0"/>
+			app:layout_constraintVertical_bias="1.0" />
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 
 </ScrollView>
diff --git a/briar-android/src/main/res/layout/fragment_sign_out.xml b/briar-android/src/main/res/layout/fragment_sign_out.xml
index 73fd8f4e5..09d8137ff 100644
--- a/briar-android/src/main/res/layout/fragment_sign_out.xml
+++ b/briar-android/src/main/res/layout/fragment_sign_out.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -19,7 +18,7 @@
 		app:layout_constraintTop_toTopOf="parent"
 		app:layout_constraintVertical_bias="0.5"
 		app:layout_constraintVertical_chainStyle="packed"
-		tools:ignore="ContentDescription"/>
+		tools:ignore="ContentDescription" />
 
 	<ProgressBar
 		android:id="@+id/progressBar"
@@ -29,7 +28,7 @@
 		app:layout_constraintBottom_toBottomOf="@+id/imageView"
 		app:layout_constraintEnd_toEndOf="@+id/imageView"
 		app:layout_constraintStart_toStartOf="@+id/imageView"
-		app:layout_constraintTop_toTopOf="@+id/imageView"/>
+		app:layout_constraintTop_toTopOf="@+id/imageView" />
 
 	<TextView
 		android:id="@+id/textView"
@@ -41,6 +40,6 @@
 		app:layout_constraintBottom_toBottomOf="parent"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
-		app:layout_constraintTop_toBottomOf="@+id/imageView"/>
+		app:layout_constraintTop_toBottomOf="@+id/imageView" />
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/image_preview.xml b/briar-android/src/main/res/layout/image_preview.xml
index e21a322b7..d33a73ca9 100644
--- a/briar-android/src/main/res/layout/image_preview.xml
+++ b/briar-android/src/main/res/layout/image_preview.xml
@@ -1,12 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
-<merge
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<merge xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	android:animateLayoutChanges="true"
-	tools:parentTag="android.support.constraint.ConstraintLayout"
+	tools:parentTag="androidx.constraintlayout.widget.ConstraintLayout"
 	tools:showIn="@layout/activity_conversation">
 
 	<View
@@ -16,29 +15,29 @@
 		app:layout_constraintBottom_toTopOf="@+id/imageList"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
-		app:layout_constraintTop_toTopOf="parent"/>
+		app:layout_constraintTop_toTopOf="parent" />
 
-	<android.support.v7.widget.RecyclerView
+	<androidx.recyclerview.widget.RecyclerView
 		android:id="@+id/imageList"
 		android:layout_width="wrap_content"
 		android:layout_height="match_parent"
 		android:orientation="horizontal"
-		app:layoutManager="android.support.v7.widget.LinearLayoutManager"
+		app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
 		app:layout_constraintBottom_toBottomOf="parent"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/divider"
 		tools:ignore="ContentDescription"
-		tools:listitem="@layout/list_item_image"/>
+		tools:listitem="@layout/list_item_image" />
 
-	<android.support.design.widget.FloatingActionButton
+	<com.google.android.material.floatingactionbutton.FloatingActionButton
 		android:id="@+id/imageCancelButton"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
-		android:layout_marginBottom="8dp"
+		android:layout_marginTop="8dp"
 		android:layout_marginEnd="8dp"
 		android:layout_marginRight="8dp"
-		android:layout_marginTop="8dp"
+		android:layout_marginBottom="8dp"
 		android:src="@drawable/ic_close"
 		app:backgroundTint="@color/briar_red"
 		app:fabCustomSize="26dp"
@@ -46,6 +45,6 @@
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
 		app:layout_constraintVertical_bias="0"
-		app:maxImageSize="18dp"/>
+		app:maxImageSize="18dp" />
 
 </merge>
diff --git a/briar-android/src/main/res/layout/introduction_message.xml b/briar-android/src/main/res/layout/introduction_message.xml
index b8020fa28..99a2e980a 100644
--- a/briar-android/src/main/res/layout/introduction_message.xml
+++ b/briar-android/src/main/res/layout/introduction_message.xml
@@ -1,13 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
 	android:orientation="vertical">
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content">
 
@@ -20,26 +19,26 @@
 			app:layout_constraintEnd_toStartOf="@+id/introductionIcon"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toTopOf="parent"
-			tools:src="@mipmap/ic_launcher_round"/>
+			tools:src="@mipmap/ic_launcher_round" />
 
 		<com.vanniktech.emoji.EmojiTextView
 			android:id="@+id/nameContact1"
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
-			android:layout_marginEnd="@dimen/margin_large"
-			android:layout_marginLeft="@dimen/margin_large"
-			android:layout_marginRight="@dimen/margin_large"
 			android:layout_marginStart="@dimen/margin_large"
+			android:layout_marginLeft="@dimen/margin_large"
 			android:layout_marginTop="@dimen/margin_medium"
+			android:layout_marginEnd="@dimen/margin_large"
+			android:layout_marginRight="@dimen/margin_large"
 			android:gravity="center"
 			android:textColor="?android:attr/textColorPrimary"
 			android:textSize="@dimen/text_size_small"
 			app:layout_constraintEnd_toStartOf="@+id/introductionIcon"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/avatarContact1"
-			tools:text="Contact 1"/>
+			tools:text="Contact 1" />
 
-		<android.support.v7.widget.AppCompatImageView
+		<androidx.appcompat.widget.AppCompatImageView
 			android:id="@+id/introductionIcon"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
@@ -50,7 +49,7 @@
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toTopOf="@+id/avatarContact2"
 			app:tint="?attr/colorControlNormal"
-			tools:ignore="ContentDescription"/>
+			tools:ignore="ContentDescription" />
 
 		<de.hdodenhof.circleimageview.CircleImageView
 			android:id="@+id/avatarContact2"
@@ -61,31 +60,31 @@
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toEndOf="@+id/introductionIcon"
 			app:layout_constraintTop_toTopOf="parent"
-			tools:src="@mipmap/ic_launcher_round"/>
+			tools:src="@mipmap/ic_launcher_round" />
 
 		<com.vanniktech.emoji.EmojiTextView
 			android:id="@+id/nameContact2"
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
-			android:layout_marginEnd="@dimen/margin_large"
-			android:layout_marginLeft="@dimen/margin_large"
-			android:layout_marginRight="@dimen/margin_large"
 			android:layout_marginStart="@dimen/margin_large"
+			android:layout_marginLeft="@dimen/margin_large"
 			android:layout_marginTop="@dimen/margin_medium"
+			android:layout_marginEnd="@dimen/margin_large"
+			android:layout_marginRight="@dimen/margin_large"
 			android:gravity="center"
 			android:textColor="?android:attr/textColorPrimary"
 			android:textSize="@dimen/text_size_small"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toEndOf="@+id/introductionIcon"
 			app:layout_constraintTop_toBottomOf="@+id/avatarContact2"
-			tools:text="Contact 2 can have quite a long name"/>
+			tools:text="Contact 2 can have quite a long name" />
 
-		<android.support.constraint.Barrier
+		<androidx.constraintlayout.widget.Barrier
 			android:id="@+id/barrier"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
 			app:barrierDirection="bottom"
-			app:constraint_referenced_ids="nameContact1,nameContact2"/>
+			app:constraint_referenced_ids="nameContact1,nameContact2" />
 
 		<ProgressBar
 			android:id="@+id/progressBar"
@@ -97,7 +96,7 @@
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toTopOf="@+id/barrier"
-			tools:visibility="gone"/>
+			tools:visibility="gone" />
 
 		<TextView
 			android:id="@+id/introductionNotPossibleView"
@@ -110,7 +109,7 @@
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/progressBar"
-			tools:visibility="visible"/>
+			tools:visibility="visible" />
 
 		<org.briarproject.briar.android.view.LargeTextInputView
 			android:id="@+id/introductionMessageView"
@@ -126,7 +125,7 @@
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/introductionNotPossibleView"
 			app:maxLines="5"
-			tools:visibility="visible"/>
+			tools:visibility="visible" />
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 </ScrollView>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/list.xml b/briar-android/src/main/res/layout/list.xml
index 8f7a01284..099c817dd 100644
--- a/briar-android/src/main/res/layout/list.xml
+++ b/briar-android/src/main/res/layout/list.xml
@@ -1,8 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
-<org.briarproject.briar.android.view.BriarRecyclerView
-	android:id="@+id/list"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<org.briarproject.briar.android.view.BriarRecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
+	android:id="@+id/list"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
-	app:scrollToEnd="false"/>
+	app:scrollToEnd="false" />
diff --git a/briar-android/src/main/res/layout/list_item_blog_comment.xml b/briar-android/src/main/res/layout/list_item_blog_comment.xml
index 9488d52ac..b6bb9b702 100644
--- a/briar-android/src/main/res/layout/list_item_blog_comment.xml
+++ b/briar-android/src/main/res/layout/list_item_blog_comment.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -11,7 +10,7 @@
 		android:id="@+id/inputDivider"
 		style="@style/Divider.Horizontal"
 		app:layout_constraintStart_toStartOf="parent"
-		app:layout_constraintTop_toTopOf="parent"/>
+		app:layout_constraintTop_toTopOf="parent" />
 
 	<org.briarproject.briar.android.view.AuthorView
 		android:id="@+id/authorView"
@@ -21,20 +20,20 @@
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
-		app:persona="commenter"/>
+		app:persona="commenter" />
 
 	<com.vanniktech.emoji.EmojiTextView
 		android:id="@+id/textView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:paddingBottom="@dimen/listitem_vertical_margin"
-		android:paddingEnd="@dimen/listitem_vertical_margin"
 		android:paddingStart="@dimen/listitem_vertical_margin"
+		android:paddingEnd="@dimen/listitem_vertical_margin"
+		android:paddingBottom="@dimen/listitem_vertical_margin"
 		android:textColor="?android:attr/textColorSecondary"
 		android:textSize="@dimen/text_size_small"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/authorView"
-		tools:text="This is a comment that appears below a blog post. Usually, it is expected to be rather short. Not much longer than this one."/>
+		tools:text="This is a comment that appears below a blog post. Usually, it is expected to be rather short. Not much longer than this one." />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/briar-android/src/main/res/layout/list_item_blog_post.xml b/briar-android/src/main/res/layout/list_item_blog_post.xml
index 98eb37b4a..293b69ae3 100644
--- a/briar-android/src/main/res/layout/list_item_blog_post.xml
+++ b/briar-android/src/main/res/layout/list_item_blog_post.xml
@@ -1,15 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.v7.widget.CardView
-	android:id="@+id/postLayout"
-	style="@style/BriarCard"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@+id/postLayout"
+	style="@style/BriarCard"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content"
 	android:foreground="?attr/selectableItemBackground">
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content">
 
@@ -17,32 +16,32 @@
 			android:id="@+id/rebloggerView"
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
-			android:layout_marginBottom="@dimen/listitem_horizontal_margin"
-			android:layout_marginEnd="@dimen/listitem_vertical_margin"
-			android:layout_marginLeft="@dimen/listitem_vertical_margin"
-			android:layout_marginRight="@dimen/listitem_vertical_margin"
 			android:layout_marginStart="@dimen/listitem_vertical_margin"
+			android:layout_marginLeft="@dimen/listitem_vertical_margin"
 			android:layout_marginTop="@dimen/listitem_vertical_margin"
+			android:layout_marginEnd="@dimen/listitem_vertical_margin"
+			android:layout_marginRight="@dimen/listitem_vertical_margin"
+			android:layout_marginBottom="@dimen/listitem_horizontal_margin"
 			app:layout_constraintEnd_toStartOf="@+id/commentView"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toTopOf="parent"
-			app:persona="reblogger"/>
+			app:persona="reblogger" />
 
 		<org.briarproject.briar.android.view.AuthorView
 			android:id="@+id/authorView"
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
-			android:layout_marginBottom="@dimen/listitem_horizontal_margin"
-			android:layout_marginEnd="@dimen/listitem_vertical_margin"
-			android:layout_marginLeft="@dimen/listitem_vertical_margin"
-			android:layout_marginRight="@dimen/listitem_vertical_margin"
 			android:layout_marginStart="@dimen/listitem_vertical_margin"
+			android:layout_marginLeft="@dimen/listitem_vertical_margin"
 			android:layout_marginTop="@dimen/listitem_vertical_margin"
+			android:layout_marginEnd="@dimen/listitem_vertical_margin"
+			android:layout_marginRight="@dimen/listitem_vertical_margin"
+			android:layout_marginBottom="@dimen/listitem_horizontal_margin"
 			app:layout_constraintEnd_toStartOf="@+id/commentView"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/rebloggerView"/>
+			app:layout_constraintTop_toBottomOf="@+id/rebloggerView" />
 
-		<android.support.v7.widget.AppCompatImageButton
+		<androidx.appcompat.widget.AppCompatImageButton
 			android:id="@+id/commentView"
 			android:layout_width="@dimen/button_size"
 			android:layout_height="@dimen/button_size"
@@ -51,7 +50,7 @@
 			android:src="@drawable/ic_repeat"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintTop_toTopOf="parent"
-			app:tint="?attr/colorControlNormal"/>
+			app:tint="?attr/colorControlNormal" />
 
 		<com.vanniktech.emoji.EmojiTextView
 			android:id="@+id/textView"
@@ -63,7 +62,7 @@
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/authorView"
-			tools:text="This is a body text that shows the content of a blog post.\n\nThis one is not short, but it is also not too long."/>
+			tools:text="This is a body text that shows the content of a blog post.\n\nThis one is not short, but it is also not too long." />
 
 		<!-- TODO replace with RecyclerView -->
 		<LinearLayout
@@ -77,10 +76,10 @@
 			<include
 				layout="@layout/list_item_blog_comment"
 				android:layout_width="match_parent"
-				android:layout_height="wrap_content"/>
+				android:layout_height="wrap_content" />
 
 		</LinearLayout>
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 
-</android.support.v7.widget.CardView>
+</androidx.cardview.widget.CardView>
diff --git a/briar-android/src/main/res/layout/list_item_contact.xml b/briar-android/src/main/res/layout/list_item_contact.xml
index 66aea9ad2..a59a0e8d2 100644
--- a/briar-android/src/main/res/layout/list_item_contact.xml
+++ b/briar-android/src/main/res/layout/list_item_contact.xml
@@ -1,9 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	android:id="@+id/linearLayout4"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@+id/linearLayout4"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content"
 	android:background="?attr/selectableItemBackground"
@@ -25,7 +24,7 @@
 			android:layout_width="@dimen/listitem_picture_size"
 			android:layout_height="@dimen/listitem_picture_size"
 			android:layout_gravity="bottom|left|start"
-			tools:src="@mipmap/ic_launcher_round"/>
+			tools:src="@mipmap/ic_launcher_round" />
 
 	</FrameLayout>
 
@@ -41,19 +40,19 @@
 		android:textStyle="bold"
 		app:layout_constraintEnd_toEndOf="@+id/avatarFrameView"
 		app:layout_constraintTop_toTopOf="@+id/avatarFrameView"
-		tools:text="123"/>
+		tools:text="123" />
 
 	<com.vanniktech.emoji.EmojiTextView
 		android:id="@+id/nameView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="@dimen/margin_medium"
-		android:layout_marginLeft="@dimen/margin_medium"
-		android:layout_marginRight="@dimen/margin_medium"
 		android:layout_marginStart="@dimen/margin_medium"
+		android:layout_marginLeft="@dimen/margin_medium"
 		android:layout_marginTop="@dimen/listitem_vertical_margin"
-		android:paddingEnd="@dimen/margin_medium"
+		android:layout_marginEnd="@dimen/margin_medium"
+		android:layout_marginRight="@dimen/margin_medium"
 		android:paddingStart="@dimen/margin_medium"
+		android:paddingEnd="@dimen/margin_medium"
 		android:textColor="?android:attr/textColorPrimary"
 		android:textSize="@dimen/text_size_medium"
 		app:layout_constraintBottom_toTopOf="@+id/dateView"
@@ -61,26 +60,26 @@
 		app:layout_constraintStart_toEndOf="@+id/avatarFrameView"
 		app:layout_constraintTop_toTopOf="parent"
 		app:layout_constraintVertical_chainStyle="packed"
-		tools:text="This is a name of a contact"/>
+		tools:text="This is a name of a contact" />
 
 	<TextView
 		android:id="@+id/dateView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginBottom="@dimen/listitem_vertical_margin"
-		android:layout_marginEnd="@dimen/margin_medium"
-		android:layout_marginLeft="@dimen/margin_medium"
-		android:layout_marginRight="@dimen/margin_medium"
 		android:layout_marginStart="@dimen/margin_medium"
-		android:paddingEnd="@dimen/margin_medium"
+		android:layout_marginLeft="@dimen/margin_medium"
+		android:layout_marginEnd="@dimen/margin_medium"
+		android:layout_marginRight="@dimen/margin_medium"
+		android:layout_marginBottom="@dimen/listitem_vertical_margin"
 		android:paddingStart="@dimen/margin_medium"
+		android:paddingEnd="@dimen/margin_medium"
 		android:textColor="?android:attr/textColorSecondary"
 		android:textSize="@dimen/text_size_small"
 		app:layout_constraintBottom_toTopOf="@+id/divider"
 		app:layout_constraintEnd_toStartOf="@+id/bulbView"
 		app:layout_constraintStart_toEndOf="@+id/avatarFrameView"
 		app:layout_constraintTop_toBottomOf="@+id/nameView"
-		tools:text="Dec 24"/>
+		tools:text="Dec 24" />
 
 	<ImageView
 		android:id="@+id/bulbView"
@@ -91,7 +90,7 @@
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
 		tools:ignore="ContentDescription"
-		tools:src="@drawable/contact_connected"/>
+		tools:src="@drawable/contact_connected" />
 
 	<View
 		android:id="@+id/divider"
@@ -99,6 +98,6 @@
 		android:layout_width="0dp"
 		app:layout_constraintBottom_toBottomOf="parent"
 		app:layout_constraintEnd_toEndOf="parent"
-		app:layout_constraintStart_toStartOf="@+id/nameView"/>
+		app:layout_constraintStart_toStartOf="@+id/nameView" />
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/list_item_contact_small.xml b/briar-android/src/main/res/layout/list_item_contact_small.xml
index 538d414d0..4669b2e32 100644
--- a/briar-android/src/main/res/layout/list_item_contact_small.xml
+++ b/briar-android/src/main/res/layout/list_item_contact_small.xml
@@ -1,12 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content"
 	android:orientation="horizontal"
-	android:paddingBottom="@dimen/margin_medium"
-	android:paddingTop="@dimen/margin_medium">
+	android:paddingTop="@dimen/margin_medium"
+	android:paddingBottom="@dimen/margin_medium">
 
 	<de.hdodenhof.circleimageview.CircleImageView
 		android:id="@+id/avatarView"
@@ -14,24 +13,24 @@
 		android:layout_width="@dimen/listitem_picture_size_small"
 		android:layout_height="@dimen/listitem_picture_size_small"
 		android:layout_gravity="center_vertical"
-		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
 		android:layout_marginStart="@dimen/listitem_horizontal_margin"
-		tools:src="@mipmap/ic_launcher_round"/>
+		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
+		tools:src="@mipmap/ic_launcher_round" />
 
 	<com.vanniktech.emoji.EmojiTextView
 		android:id="@+id/nameView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
 		android:layout_gravity="center_vertical"
-		android:layout_marginEnd="@dimen/margin_medium"
-		android:layout_marginLeft="@dimen/margin_medium"
-		android:layout_marginRight="@dimen/margin_medium"
 		android:layout_marginStart="@dimen/margin_medium"
+		android:layout_marginLeft="@dimen/margin_medium"
+		android:layout_marginEnd="@dimen/margin_medium"
+		android:layout_marginRight="@dimen/margin_medium"
 		android:layout_weight="1"
 		android:maxLines="2"
 		android:textColor="?android:attr/textColorPrimary"
 		android:textSize="@dimen/text_size_medium"
-		tools:text="This is a name of a contact"/>
+		tools:text="This is a name of a contact" />
 
 	<ImageView
 		android:id="@+id/bulbView"
@@ -41,6 +40,6 @@
 		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
 		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		tools:ignore="ContentDescription"
-		tools:src="@drawable/contact_connected"/>
+		tools:src="@drawable/contact_connected" />
 
 </LinearLayout>
diff --git a/briar-android/src/main/res/layout/list_item_conversation_msg_image.xml b/briar-android/src/main/res/layout/list_item_conversation_msg_image.xml
index c7459d36f..020bca4b3 100644
--- a/briar-android/src/main/res/layout/list_item_conversation_msg_image.xml
+++ b/briar-android/src/main/res/layout/list_item_conversation_msg_image.xml
@@ -1,43 +1,42 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	android:id="@+id/layout"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@+id/layout"
 	android:layout_width="wrap_content"
 	android:layout_height="wrap_content"
-	android:layout_marginBottom="@dimen/message_bubble_margin"
-	android:layout_marginEnd="@dimen/message_bubble_margin_non_tail"
-	android:layout_marginLeft="@dimen/message_bubble_margin_tail"
-	android:layout_marginRight="@dimen/message_bubble_margin_non_tail"
 	android:layout_marginStart="@dimen/message_bubble_margin_tail"
+	android:layout_marginLeft="@dimen/message_bubble_margin_tail"
 	android:layout_marginTop="@dimen/message_bubble_margin"
+	android:layout_marginEnd="@dimen/message_bubble_margin_non_tail"
+	android:layout_marginRight="@dimen/message_bubble_margin_non_tail"
+	android:layout_marginBottom="@dimen/message_bubble_margin"
 	android:background="@drawable/msg_in"
 	android:elevation="@dimen/message_bubble_elevation">
 
-	<android.support.v7.widget.RecyclerView
+	<androidx.recyclerview.widget.RecyclerView
 		android:id="@+id/imageList"
 		android:layout_width="@dimen/message_bubble_image_default"
 		android:layout_height="@dimen/message_bubble_image_default"
 		android:orientation="vertical"
-		app:layoutManager="android.support.v7.widget.StaggeredGridLayoutManager"
+		app:layoutManager="androidx.recyclerview.widget.StaggeredGridLayoutManager"
 		app:layout_constraintBottom_toTopOf="@+id/text"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
 		app:spanCount="2"
 		tools:ignore="ContentDescription"
-		tools:listitem="@layout/list_item_image"/>
+		tools:listitem="@layout/list_item_image" />
 
 	<com.vanniktech.emoji.EmojiTextView
 		android:id="@+id/text"
 		style="@style/TextMessage"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
-		android:layout_marginBottom="@dimen/message_bubble_padding_bottom_inner"
 		android:layout_marginLeft="@dimen/message_bubble_padding_sides_inner"
-		android:layout_marginRight="@dimen/message_bubble_padding_sides_inner"
 		android:layout_marginTop="@dimen/message_bubble_padding_top_inner"
+		android:layout_marginRight="@dimen/message_bubble_padding_sides_inner"
+		android:layout_marginBottom="@dimen/message_bubble_padding_bottom_inner"
 		android:textColor="?android:attr/textColorPrimary"
 		android:visibility="gone"
 		app:layout_constrainedWidth="true"
@@ -46,15 +45,15 @@
 		app:layout_constraintHorizontal_bias="0.0"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/imageList"
-		tools:text="The text of a message which can sometimes be a bit longer as well"/>
+		tools:text="The text of a message which can sometimes be a bit longer as well" />
 
 	<LinearLayout
 		android:id="@+id/statusLayout"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
-		android:layout_marginBottom="@dimen/message_bubble_padding_top"
 		android:layout_marginLeft="@dimen/message_bubble_padding_sides_inner"
 		android:layout_marginRight="@dimen/message_bubble_padding_sides_inner"
+		android:layout_marginBottom="@dimen/message_bubble_padding_top"
 		android:background="@drawable/msg_status_bubble"
 		android:orientation="horizontal"
 		app:layout_constraintBottom_toBottomOf="@+id/imageList"
@@ -67,8 +66,8 @@
 			style="@style/TextMessage.Timestamp"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
-			tools:text="Dec 24, 13:37"/>
+			tools:text="Dec 24, 13:37" />
 
 	</LinearLayout>
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/briar-android/src/main/res/layout/list_item_conversation_msg_image_text.xml b/briar-android/src/main/res/layout/list_item_conversation_msg_image_text.xml
index e90bd0221..27056a3da 100644
--- a/briar-android/src/main/res/layout/list_item_conversation_msg_image_text.xml
+++ b/briar-android/src/main/res/layout/list_item_conversation_msg_image_text.xml
@@ -1,43 +1,42 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	android:id="@+id/layout"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@+id/layout"
 	android:layout_width="wrap_content"
 	android:layout_height="wrap_content"
-	android:layout_marginBottom="@dimen/message_bubble_margin"
-	android:layout_marginEnd="@dimen/message_bubble_margin_non_tail"
-	android:layout_marginLeft="@dimen/message_bubble_margin_tail"
-	android:layout_marginRight="@dimen/message_bubble_margin_non_tail"
 	android:layout_marginStart="@dimen/message_bubble_margin_tail"
+	android:layout_marginLeft="@dimen/message_bubble_margin_tail"
 	android:layout_marginTop="@dimen/message_bubble_margin"
+	android:layout_marginEnd="@dimen/message_bubble_margin_non_tail"
+	android:layout_marginRight="@dimen/message_bubble_margin_non_tail"
+	android:layout_marginBottom="@dimen/message_bubble_margin"
 	android:background="@drawable/msg_in"
 	android:elevation="@dimen/message_bubble_elevation">
 
-	<android.support.v7.widget.RecyclerView
+	<androidx.recyclerview.widget.RecyclerView
 		android:id="@+id/imageList"
 		android:layout_width="@dimen/message_bubble_image_default"
 		android:layout_height="@dimen/message_bubble_image_default"
 		android:orientation="vertical"
-		app:layoutManager="android.support.v7.widget.StaggeredGridLayoutManager"
+		app:layoutManager="androidx.recyclerview.widget.StaggeredGridLayoutManager"
 		app:layout_constraintBottom_toTopOf="@+id/text"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
 		app:spanCount="2"
 		tools:ignore="ContentDescription"
-		tools:listitem="@layout/list_item_image"/>
+		tools:listitem="@layout/list_item_image" />
 
 	<com.vanniktech.emoji.EmojiTextView
 		android:id="@+id/text"
 		style="@style/TextMessage"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginBottom="@dimen/message_bubble_padding_bottom_inner"
 		android:layout_marginLeft="@dimen/message_bubble_padding_sides_inner"
-		android:layout_marginRight="@dimen/message_bubble_padding_sides_inner"
 		android:layout_marginTop="@dimen/message_bubble_padding_top_inner"
+		android:layout_marginRight="@dimen/message_bubble_padding_sides_inner"
+		android:layout_marginBottom="@dimen/message_bubble_padding_bottom_inner"
 		android:textColor="?android:attr/textColorPrimary"
 		app:layout_constrainedWidth="true"
 		app:layout_constraintBottom_toTopOf="@+id/statusLayout"
@@ -45,15 +44,15 @@
 		app:layout_constraintHorizontal_bias="0.0"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/imageList"
-		tools:text="The text of a message which can sometimes be a bit longer as well"/>
+		tools:text="The text of a message which can sometimes be a bit longer as well" />
 
 	<LinearLayout
 		android:id="@+id/statusLayout"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
-		android:layout_marginBottom="@dimen/message_bubble_padding_bottom_inner"
 		android:layout_marginLeft="@dimen/message_bubble_padding_sides_inner"
 		android:layout_marginRight="@dimen/message_bubble_padding_sides_inner"
+		android:layout_marginBottom="@dimen/message_bubble_padding_bottom_inner"
 		android:orientation="horizontal"
 		app:layout_constraintBottom_toBottomOf="parent"
 		app:layout_constraintEnd_toEndOf="parent"
@@ -66,8 +65,8 @@
 			style="@style/TextMessage.Timestamp"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
-			tools:text="Dec 24, 13:37"/>
+			tools:text="Dec 24, 13:37" />
 
 	</LinearLayout>
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/briar-android/src/main/res/layout/list_item_conversation_msg_in.xml b/briar-android/src/main/res/layout/list_item_conversation_msg_in.xml
index 17f393708..a92cf249c 100644
--- a/briar-android/src/main/res/layout/list_item_conversation_msg_in.xml
+++ b/briar-android/src/main/res/layout/list_item_conversation_msg_in.xml
@@ -1,44 +1,43 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	android:id="@+id/layout"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@+id/layout"
 	android:layout_width="wrap_content"
 	android:layout_height="wrap_content"
-	android:layout_marginBottom="@dimen/message_bubble_margin"
-	android:layout_marginEnd="@dimen/message_bubble_margin_non_tail"
-	android:layout_marginLeft="@dimen/message_bubble_margin_tail"
-	android:layout_marginRight="@dimen/message_bubble_margin_non_tail"
 	android:layout_marginStart="@dimen/message_bubble_margin_tail"
+	android:layout_marginLeft="@dimen/message_bubble_margin_tail"
 	android:layout_marginTop="@dimen/message_bubble_margin"
+	android:layout_marginEnd="@dimen/message_bubble_margin_non_tail"
+	android:layout_marginRight="@dimen/message_bubble_margin_non_tail"
+	android:layout_marginBottom="@dimen/message_bubble_margin"
 	android:background="@drawable/msg_in"
 	android:elevation="@dimen/message_bubble_elevation">
 
-	<android.support.v7.widget.RecyclerView
+	<androidx.recyclerview.widget.RecyclerView
 		android:id="@+id/imageList"
 		android:layout_width="@dimen/message_bubble_image_default"
 		android:layout_height="@dimen/message_bubble_image_default"
 		android:orientation="vertical"
 		android:visibility="gone"
-		app:layoutManager="android.support.v7.widget.StaggeredGridLayoutManager"
+		app:layoutManager="androidx.recyclerview.widget.StaggeredGridLayoutManager"
 		app:layout_constraintBottom_toTopOf="@+id/text"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
 		app:spanCount="2"
 		tools:ignore="ContentDescription"
-		tools:listitem="@layout/list_item_image"/>
+		tools:listitem="@layout/list_item_image" />
 
 	<com.vanniktech.emoji.EmojiTextView
 		android:id="@+id/text"
 		style="@style/TextMessage"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
-		android:layout_marginBottom="@dimen/message_bubble_padding_bottom_inner"
 		android:layout_marginLeft="@dimen/message_bubble_padding_sides_inner"
-		android:layout_marginRight="@dimen/message_bubble_padding_sides_inner"
 		android:layout_marginTop="@dimen/message_bubble_padding_top_inner"
+		android:layout_marginRight="@dimen/message_bubble_padding_sides_inner"
+		android:layout_marginBottom="@dimen/message_bubble_padding_bottom_inner"
 		android:textColor="?android:attr/textColorPrimary"
 		app:layout_constrainedWidth="true"
 		app:layout_constraintBottom_toTopOf="@+id/statusLayout"
@@ -46,15 +45,15 @@
 		app:layout_constraintHorizontal_bias="0.0"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/imageList"
-		tools:text="The text of a message which can sometimes be a bit longer as well"/>
+		tools:text="The text of a message which can sometimes be a bit longer as well" />
 
 	<LinearLayout
 		android:id="@+id/statusLayout"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
-		android:layout_marginBottom="@dimen/message_bubble_padding_bottom_inner"
 		android:layout_marginLeft="@dimen/message_bubble_padding_sides_inner"
 		android:layout_marginRight="@dimen/message_bubble_padding_sides_inner"
+		android:layout_marginBottom="@dimen/message_bubble_padding_bottom_inner"
 		android:orientation="horizontal"
 		app:layout_constraintBottom_toBottomOf="parent"
 		app:layout_constraintEnd_toEndOf="parent"
@@ -67,8 +66,8 @@
 			style="@style/TextMessage.Timestamp"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
-			tools:text="Dec 24, 13:37"/>
+			tools:text="Dec 24, 13:37" />
 
 	</LinearLayout>
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/briar-android/src/main/res/layout/list_item_conversation_msg_out.xml b/briar-android/src/main/res/layout/list_item_conversation_msg_out.xml
index 71fcde591..f77f9609b 100644
--- a/briar-android/src/main/res/layout/list_item_conversation_msg_out.xml
+++ b/briar-android/src/main/res/layout/list_item_conversation_msg_out.xml
@@ -1,50 +1,48 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- This is needed to right-align message bubble in RecyclerView -->
-<FrameLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<?xml version="1.0" encoding="utf-8"?><!-- This is needed to right-align message bubble in RecyclerView -->
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content">
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:id="@+id/layout"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
 		android:layout_gravity="right|end"
-		android:layout_marginBottom="@dimen/message_bubble_margin"
-		android:layout_marginEnd="@dimen/message_bubble_margin_tail"
-		android:layout_marginLeft="@dimen/message_bubble_margin_non_tail"
-		android:layout_marginRight="@dimen/message_bubble_margin_tail"
 		android:layout_marginStart="@dimen/message_bubble_margin_non_tail"
+		android:layout_marginLeft="@dimen/message_bubble_margin_non_tail"
 		android:layout_marginTop="@dimen/message_bubble_margin"
+		android:layout_marginEnd="@dimen/message_bubble_margin_tail"
+		android:layout_marginRight="@dimen/message_bubble_margin_tail"
+		android:layout_marginBottom="@dimen/message_bubble_margin"
 		android:background="@drawable/msg_out"
 		android:elevation="@dimen/message_bubble_elevation">
 
-		<android.support.v7.widget.RecyclerView
+		<androidx.recyclerview.widget.RecyclerView
 			android:id="@+id/imageList"
 			android:layout_width="@dimen/message_bubble_image_default"
 			android:layout_height="@dimen/message_bubble_image_default"
 			android:orientation="vertical"
 			android:visibility="gone"
-			app:layoutManager="android.support.v7.widget.StaggeredGridLayoutManager"
+			app:layoutManager="androidx.recyclerview.widget.StaggeredGridLayoutManager"
 			app:layout_constraintBottom_toTopOf="@+id/text"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toTopOf="parent"
 			app:spanCount="2"
 			tools:ignore="ContentDescription"
-			tools:src="@drawable/alerts_and_states_error"/>
+			tools:src="@drawable/alerts_and_states_error" />
 
 		<com.vanniktech.emoji.EmojiTextView
 			android:id="@+id/text"
 			style="@style/TextMessage"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
-			android:layout_marginBottom="@dimen/message_bubble_padding_bottom_inner"
 			android:layout_marginLeft="@dimen/message_bubble_padding_sides_inner"
-			android:layout_marginRight="@dimen/message_bubble_padding_sides_inner"
 			android:layout_marginTop="@dimen/message_bubble_padding_top_inner"
+			android:layout_marginRight="@dimen/message_bubble_padding_sides_inner"
+			android:layout_marginBottom="@dimen/message_bubble_padding_bottom_inner"
 			android:textColor="@color/briar_text_primary_inverse"
 			app:layout_constrainedWidth="true"
 			app:layout_constraintBottom_toTopOf="@+id/statusLayout"
@@ -52,15 +50,15 @@
 			app:layout_constraintHorizontal_bias="0.0"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/imageList"
-			tools:text="This is a long long long message that spans over several lines.\n\nIt ends here."/>
+			tools:text="This is a long long long message that spans over several lines.\n\nIt ends here." />
 
 		<LinearLayout
 			android:id="@+id/statusLayout"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
-			android:layout_marginBottom="@dimen/message_bubble_padding_bottom_inner"
 			android:layout_marginLeft="@dimen/message_bubble_padding_sides_inner"
 			android:layout_marginRight="@dimen/message_bubble_padding_sides_inner"
+			android:layout_marginBottom="@dimen/message_bubble_padding_bottom_inner"
 			android:orientation="horizontal"
 			app:layout_constraintBottom_toBottomOf="parent"
 			app:layout_constraintEnd_toEndOf="parent"
@@ -77,17 +75,17 @@
 				android:layout_marginEnd="6dp"
 				android:layout_marginRight="6dp"
 				android:textColor="@color/private_message_date_inverse"
-				tools:text="Dec 24, 13:37"/>
+				tools:text="Dec 24, 13:37" />
 
 			<ImageView
 				android:id="@+id/status"
 				android:layout_width="wrap_content"
 				android:layout_height="wrap_content"
 				tools:ignore="ContentDescription"
-				tools:src="@drawable/message_delivered"/>
+				tools:src="@drawable/message_delivered" />
 
 		</LinearLayout>
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 
 </FrameLayout>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/list_item_conversation_notice_in.xml b/briar-android/src/main/res/layout/list_item_conversation_notice_in.xml
index 2ab8cb207..689c9208c 100644
--- a/briar-android/src/main/res/layout/list_item_conversation_notice_in.xml
+++ b/briar-android/src/main/res/layout/list_item_conversation_notice_in.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -13,23 +12,23 @@
 		style="@style/TextMessage"
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="@dimen/message_bubble_margin_non_tail"
-		android:layout_marginLeft="@dimen/message_bubble_margin_tail"
-		android:layout_marginRight="@dimen/message_bubble_margin_non_tail"
 		android:layout_marginStart="@dimen/message_bubble_margin_tail"
+		android:layout_marginLeft="@dimen/message_bubble_margin_tail"
+		android:layout_marginEnd="@dimen/message_bubble_margin_non_tail"
+		android:layout_marginRight="@dimen/message_bubble_margin_non_tail"
 		android:background="@drawable/msg_in_top"
 		android:elevation="@dimen/message_bubble_elevation"
-		tools:text="Short message"/>
+		tools:text="Short message" />
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:id="@+id/layout"
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
-		android:layout_marginBottom="@dimen/message_bubble_margin"
-		android:layout_marginEnd="@dimen/message_bubble_margin_non_tail"
-		android:layout_marginLeft="@dimen/message_bubble_margin_tail"
-		android:layout_marginRight="@dimen/message_bubble_margin_non_tail"
 		android:layout_marginStart="@dimen/message_bubble_margin_tail"
+		android:layout_marginLeft="@dimen/message_bubble_margin_tail"
+		android:layout_marginEnd="@dimen/message_bubble_margin_non_tail"
+		android:layout_marginRight="@dimen/message_bubble_margin_non_tail"
+		android:layout_marginBottom="@dimen/message_bubble_margin"
 		android:background="@drawable/notice_in_bottom"
 		android:elevation="@dimen/message_bubble_elevation">
 
@@ -40,7 +39,7 @@
 			android:layout_height="wrap_content"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toTopOf="parent"
-			tools:text="@string/forum_invitation_received"/>
+			tools:text="@string/forum_invitation_received" />
 
 		<TextView
 			android:id="@+id/time"
@@ -50,8 +49,8 @@
 			android:layout_marginTop="@dimen/message_bubble_timestamp_margin"
 			app:layout_constraintEnd_toEndOf="@+id/text"
 			app:layout_constraintTop_toBottomOf="@+id/text"
-			tools:text="Dec 24, 13:37"/>
+			tools:text="Dec 24, 13:37" />
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 
 </LinearLayout>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/list_item_conversation_notice_out.xml b/briar-android/src/main/res/layout/list_item_conversation_notice_out.xml
index 20be19ccf..4ae737834 100644
--- a/briar-android/src/main/res/layout/list_item_conversation_notice_out.xml
+++ b/briar-android/src/main/res/layout/list_item_conversation_notice_out.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -13,24 +12,24 @@
 		style="@style/TextMessage"
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="@dimen/message_bubble_margin_tail"
-		android:layout_marginLeft="@dimen/message_bubble_margin_non_tail"
-		android:layout_marginRight="@dimen/message_bubble_margin_tail"
 		android:layout_marginStart="@dimen/message_bubble_margin_non_tail"
+		android:layout_marginLeft="@dimen/message_bubble_margin_non_tail"
+		android:layout_marginEnd="@dimen/message_bubble_margin_tail"
+		android:layout_marginRight="@dimen/message_bubble_margin_tail"
 		android:background="@drawable/msg_out_top"
 		android:elevation="@dimen/message_bubble_elevation"
 		android:textColor="@color/briar_text_primary_inverse"
-		tools:text="This is a long long long message that spans over several lines.\n\nIt ends here."/>
+		tools:text="This is a long long long message that spans over several lines.\n\nIt ends here." />
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:id="@+id/layout"
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
-		android:layout_marginBottom="@dimen/message_bubble_margin"
-		android:layout_marginEnd="@dimen/message_bubble_margin_tail"
-		android:layout_marginLeft="@dimen/message_bubble_margin_non_tail"
-		android:layout_marginRight="@dimen/message_bubble_margin_tail"
 		android:layout_marginStart="@dimen/message_bubble_margin_non_tail"
+		android:layout_marginLeft="@dimen/message_bubble_margin_non_tail"
+		android:layout_marginEnd="@dimen/message_bubble_margin_tail"
+		android:layout_marginRight="@dimen/message_bubble_margin_tail"
+		android:layout_marginBottom="@dimen/message_bubble_margin"
 		android:background="@drawable/notice_out_bottom"
 		android:elevation="@dimen/message_bubble_elevation">
 
@@ -42,7 +41,7 @@
 			android:textColor="@color/private_message_date_inverse"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toTopOf="parent"
-			tools:text="@string/introduction_request_received"/>
+			tools:text="@string/introduction_request_received" />
 
 		<TextView
 			android:id="@+id/time"
@@ -53,20 +52,20 @@
 			android:textColor="@color/private_message_date_inverse"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/text"
-			tools:text="Dec 24, 13:37"/>
+			tools:text="Dec 24, 13:37" />
 
 		<ImageView
 			android:id="@+id/status"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
-			android:layout_marginLeft="@dimen/margin_medium"
 			android:layout_marginStart="@dimen/margin_medium"
+			android:layout_marginLeft="@dimen/margin_medium"
 			app:layout_constraintBottom_toBottomOf="@+id/time"
 			app:layout_constraintStart_toEndOf="@+id/time"
 			app:layout_constraintTop_toTopOf="@+id/time"
 			tools:ignore="ContentDescription"
-			tools:src="@drawable/message_delivered"/>
+			tools:src="@drawable/message_delivered" />
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 
 </LinearLayout>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/list_item_conversation_request.xml b/briar-android/src/main/res/layout/list_item_conversation_request.xml
index 039202689..a1fbf33dd 100644
--- a/briar-android/src/main/res/layout/list_item_conversation_request.xml
+++ b/briar-android/src/main/res/layout/list_item_conversation_request.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -13,24 +12,24 @@
 		style="@style/TextMessage"
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="@dimen/message_bubble_margin_non_tail"
-		android:layout_marginLeft="@dimen/message_bubble_margin_tail"
-		android:layout_marginRight="@dimen/message_bubble_margin_non_tail"
 		android:layout_marginStart="@dimen/message_bubble_margin_tail"
+		android:layout_marginLeft="@dimen/message_bubble_margin_tail"
+		android:layout_marginEnd="@dimen/message_bubble_margin_non_tail"
+		android:layout_marginRight="@dimen/message_bubble_margin_non_tail"
 		android:background="@drawable/msg_in_top"
 		android:elevation="@dimen/message_bubble_elevation"
 		android:textColor="?android:attr/textColorPrimary"
-		tools:text="Short message"/>
+		tools:text="Short message" />
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:id="@+id/layout"
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
-		android:layout_marginBottom="@dimen/message_bubble_margin"
-		android:layout_marginEnd="@dimen/message_bubble_margin_non_tail"
-		android:layout_marginLeft="@dimen/message_bubble_margin_tail"
-		android:layout_marginRight="@dimen/message_bubble_margin_non_tail"
 		android:layout_marginStart="@dimen/message_bubble_margin_tail"
+		android:layout_marginLeft="@dimen/message_bubble_margin_tail"
+		android:layout_marginEnd="@dimen/message_bubble_margin_non_tail"
+		android:layout_marginRight="@dimen/message_bubble_margin_non_tail"
+		android:layout_marginBottom="@dimen/message_bubble_margin"
 		android:background="@drawable/notice_in_bottom"
 		android:elevation="@dimen/message_bubble_elevation">
 
@@ -41,7 +40,7 @@
 			android:layout_height="wrap_content"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toTopOf="parent"
-			tools:text="@string/introduction_request_received"/>
+			tools:text="@string/introduction_request_received" />
 
 		<Button
 			android:id="@+id/acceptButton"
@@ -50,7 +49,7 @@
 			android:layout_height="wrap_content"
 			android:text="@string/accept"
 			app:layout_constraintEnd_toEndOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/text"/>
+			app:layout_constraintTop_toBottomOf="@+id/text" />
 
 		<Button
 			android:id="@+id/declineButton"
@@ -60,7 +59,7 @@
 			android:text="@string/decline"
 			app:layout_constraintBottom_toBottomOf="@+id/acceptButton"
 			app:layout_constraintEnd_toStartOf="@+id/acceptButton"
-			app:layout_constraintTop_toTopOf="@+id/acceptButton"/>
+			app:layout_constraintTop_toTopOf="@+id/acceptButton" />
 
 		<TextView
 			android:id="@+id/time"
@@ -69,8 +68,8 @@
 			android:layout_height="wrap_content"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/acceptButton"
-			tools:text="Dec 24, 13:37"/>
+			tools:text="Dec 24, 13:37" />
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 
 </LinearLayout>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/list_item_crash.xml b/briar-android/src/main/res/layout/list_item_crash.xml
index 1839bba88..aa9c6250a 100644
--- a/briar-android/src/main/res/layout/list_item_crash.xml
+++ b/briar-android/src/main/res/layout/list_item_crash.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -10,14 +9,14 @@
 		android:id="@+id/include_in_report"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginLeft="@dimen/margin_medium"
 		android:layout_marginStart="@dimen/margin_medium"
+		android:layout_marginLeft="@dimen/margin_medium"
 		android:textColor="?android:attr/textColorPrimary"
 		android:textSize="@dimen/text_size_large"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
-		tools:text="Crash log entry title"/>
+		tools:text="Crash log entry title" />
 
 	<TextView
 		android:id="@+id/content"
@@ -28,6 +27,6 @@
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/include_in_report"
-		tools:text="Crash log entry value"/>
+		tools:text="Crash log entry value" />
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/list_item_forum.xml b/briar-android/src/main/res/layout/list_item_forum.xml
index 8489b8a3a..c76ead606 100644
--- a/briar-android/src/main/res/layout/list_item_forum.xml
+++ b/briar-android/src/main/res/layout/list_item_forum.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -11,41 +10,41 @@
 		android:id="@+id/avatarView"
 		android:layout_width="@dimen/listitem_picture_frame_size"
 		android:layout_height="@dimen/listitem_picture_frame_size"
-		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
 		android:layout_marginStart="@dimen/listitem_horizontal_margin"
+		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
 		app:layout_constraintBottom_toTopOf="@+id/divider"
 		app:layout_constraintStart_toStartOf="parent"
-		app:layout_constraintTop_toTopOf="parent"/>
+		app:layout_constraintTop_toTopOf="parent" />
 
 	<com.vanniktech.emoji.EmojiTextView
 		android:id="@+id/forumNameView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
-		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
-		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:layout_marginStart="@dimen/listitem_horizontal_margin"
+		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
 		android:layout_marginTop="@dimen/listitem_horizontal_margin"
+		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
+		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:textColor="?android:attr/textColorPrimary"
 		android:textSize="@dimen/text_size_medium"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toEndOf="@+id/avatarView"
 		app:layout_constraintTop_toTopOf="parent"
-		tools:text="This is a name of a forum which can be long"/>
+		tools:text="This is a name of a forum which can be long" />
 
 	<TextView
 		android:id="@+id/postCountView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
+		android:layout_marginTop="@dimen/margin_medium"
 		android:layout_marginEnd="8dp"
 		android:layout_marginRight="8dp"
-		android:layout_marginTop="@dimen/margin_medium"
 		android:textColor="?android:attr/textColorSecondary"
 		android:textSize="@dimen/text_size_small"
 		app:layout_constraintEnd_toStartOf="@+id/dateView"
 		app:layout_constraintStart_toStartOf="@+id/forumNameView"
 		app:layout_constraintTop_toBottomOf="@+id/forumNameView"
-		tools:text="@string/no_forum_posts"/>
+		tools:text="@string/no_forum_posts" />
 
 	<TextView
 		android:id="@+id/dateView"
@@ -57,18 +56,18 @@
 		android:textSize="@dimen/text_size_small"
 		app:layout_constraintBaseline_toBaselineOf="@+id/postCountView"
 		app:layout_constraintEnd_toEndOf="parent"
-		tools:text="Dec 24"/>
+		tools:text="Dec 24" />
 
 	<View
 		android:id="@+id/divider"
 		style="@style/Divider.ThreadItem"
 		android:layout_width="0dp"
-		android:layout_marginLeft="@dimen/margin_medium"
 		android:layout_marginStart="@dimen/margin_medium"
+		android:layout_marginLeft="@dimen/margin_medium"
 		android:layout_marginTop="@dimen/listitem_horizontal_margin"
 		app:layout_constraintBottom_toBottomOf="parent"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toEndOf="@+id/avatarView"
-		app:layout_constraintTop_toBottomOf="@id/postCountView"/>
+		app:layout_constraintTop_toBottomOf="@id/postCountView" />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/briar-android/src/main/res/layout/list_item_group.xml b/briar-android/src/main/res/layout/list_item_group.xml
index 86d2ec2af..01b88a1e8 100644
--- a/briar-android/src/main/res/layout/list_item_group.xml
+++ b/briar-android/src/main/res/layout/list_item_group.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -14,7 +13,7 @@
 		android:layout_margin="@dimen/listitem_horizontal_margin"
 		app:layout_constraintBottom_toTopOf="@+id/divider"
 		app:layout_constraintStart_toStartOf="parent"
-		app:layout_constraintTop_toTopOf="parent"/>
+		app:layout_constraintTop_toTopOf="parent" />
 
 	<com.vanniktech.emoji.EmojiTextView
 		android:id="@+id/nameView"
@@ -26,38 +25,38 @@
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toEndOf="@+id/avatarView"
 		app:layout_constraintTop_toTopOf="parent"
-		tools:text="This is a name of a Private Group which can be quite long actually"/>
+		tools:text="This is a name of a Private Group which can be quite long actually" />
 
 	<com.vanniktech.emoji.EmojiTextView
 		android:id="@+id/creatorView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
+		android:layout_marginTop="@dimen/margin_small"
 		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
 		android:layout_marginRight="@dimen/listitem_horizontal_margin"
-		android:layout_marginTop="@dimen/margin_small"
 		android:textColor="?android:attr/textColorSecondary"
 		android:textSize="@dimen/text_size_small"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="@+id/nameView"
 		app:layout_constraintTop_toBottomOf="@+id/nameView"
-		tools:text="Created by Santa Claus"/>
+		tools:text="Created by Santa Claus" />
 
 	<TextView
 		android:id="@+id/messageCountView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
-		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
-		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:layout_marginStart="@dimen/listitem_horizontal_margin"
+		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
 		android:layout_marginTop="@dimen/margin_medium"
+		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
+		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:textColor="?android:attr/textColorSecondary"
 		android:textSize="@dimen/text_size_small"
 		app:layout_constraintEnd_toStartOf="@+id/dateView"
 		app:layout_constraintStart_toEndOf="@+id/avatarView"
 		app:layout_constraintTop_toBottomOf="@+id/creatorView"
 		tools:text="1337 messages"
-		tools:visibility="visible"/>
+		tools:visibility="visible" />
 
 	<TextView
 		android:id="@+id/dateView"
@@ -70,23 +69,23 @@
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintRight_toRightOf="parent"
 		tools:text="3 weeks ago, 12:00"
-		tools:visibility="visible"/>
+		tools:visibility="visible" />
 
 	<TextView
 		android:id="@+id/statusView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
-		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
-		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:layout_marginStart="@dimen/listitem_horizontal_margin"
+		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
 		android:layout_marginTop="@dimen/margin_medium"
+		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
+		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:textColor="?android:attr/textColorTertiary"
 		app:layout_constraintEnd_toStartOf="@+id/removeButton"
 		app:layout_constraintLeft_toRightOf="@+id/avatarView"
 		app:layout_constraintStart_toEndOf="@+id/avatarView"
 		app:layout_constraintTop_toBottomOf="@+id/messageCountView"
-		tools:text="This group is empty, but has a long status text"/>
+		tools:text="This group is empty, but has a long status text" />
 
 	<Button
 		android:id="@+id/removeButton"
@@ -98,18 +97,18 @@
 		app:layout_constraintBottom_toBottomOf="@+id/divider"
 		app:layout_constraintRight_toRightOf="parent"
 		app:layout_constraintTop_toTopOf="@+id/statusView"
-		tools:visibility="visible"/>
+		tools:visibility="visible" />
 
 	<View
 		android:id="@+id/divider"
 		style="@style/Divider.ThreadItem"
 		android:layout_width="0dp"
-		android:layout_marginLeft="@dimen/margin_medium"
 		android:layout_marginStart="@dimen/margin_medium"
+		android:layout_marginLeft="@dimen/margin_medium"
 		android:layout_marginTop="@dimen/listitem_horizontal_margin"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toEndOf="@+id/avatarView"
-		app:layout_constraintTop_toBottomOf="@+id/statusView"/>
+		app:layout_constraintTop_toBottomOf="@+id/statusView" />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
 
diff --git a/briar-android/src/main/res/layout/list_item_group_join_notice.xml b/briar-android/src/main/res/layout/list_item_group_join_notice.xml
index c9eba2f0c..fd61c2e9c 100644
--- a/briar-android/src/main/res/layout/list_item_group_join_notice.xml
+++ b/briar-android/src/main/res/layout/list_item_group_join_notice.xml
@@ -1,9 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	android:id="@+id/layout"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@+id/layout"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content"
 	android:background="@drawable/list_item_thread_background">
@@ -12,7 +11,7 @@
 		android:id="@+id/divider"
 		style="@style/Divider.ThreadItem"
 		app:layout_constraintLeft_toLeftOf="parent"
-		app:layout_constraintTop_toTopOf="parent"/>
+		app:layout_constraintTop_toTopOf="parent" />
 
 	<org.briarproject.briar.android.view.AuthorView
 		android:id="@+id/author"
@@ -22,7 +21,7 @@
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/divider"
-		app:persona="commenter"/>
+		app:persona="commenter" />
 
 	<com.vanniktech.emoji.EmojiTextView
 		android:id="@+id/text"
@@ -34,6 +33,6 @@
 		android:textStyle="italic"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@id/author"
-		tools:text="@string/groups_member_joined"/>
+		tools:text="@string/groups_member_joined" />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/briar-android/src/main/res/layout/list_item_group_member.xml b/briar-android/src/main/res/layout/list_item_group_member.xml
index 9af20d6e6..21946a4f0 100644
--- a/briar-android/src/main/res/layout/list_item_group_member.xml
+++ b/briar-android/src/main/res/layout/list_item_group_member.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -14,7 +13,7 @@
 		app:layout_constraintEnd_toStartOf="@+id/bulbView"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
-		app:persona="list"/>
+		app:persona="list" />
 
 	<ImageView
 		android:id="@+id/bulbView"
@@ -25,29 +24,29 @@
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
 		tools:ignore="ContentDescription"
-		tools:src="@drawable/contact_connected"/>
+		tools:src="@drawable/contact_connected" />
 
 	<TextView
 		android:id="@+id/creatorView"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
-		android:layout_marginLeft="40dp"
 		android:layout_marginStart="40dp"
+		android:layout_marginLeft="40dp"
 		android:layout_marginTop="@dimen/margin_small"
 		android:text="@string/groups_member_created_you"
 		android:textColor="?android:attr/textColorSecondary"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/authorView"
-		tools:visibility="visible"/>
+		tools:visibility="visible" />
 
 	<View
 		android:id="@+id/divider"
 		style="@style/Divider.ContactList"
-		android:layout_marginLeft="36dp"
 		android:layout_marginStart="36dp"
+		android:layout_marginLeft="36dp"
 		android:layout_marginTop="@dimen/margin_medium"
 		app:layout_constraintBottom_toBottomOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
-		app:layout_constraintTop_toBottomOf="@+id/creatorView"/>
+		app:layout_constraintTop_toBottomOf="@+id/creatorView" />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/briar-android/src/main/res/layout/list_item_image.xml b/briar-android/src/main/res/layout/list_item_image.xml
index 275d9df1d..2ece6ce0b 100644
--- a/briar-android/src/main/res/layout/list_item_image.xml
+++ b/briar-android/src/main/res/layout/list_item_image.xml
@@ -1,10 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ImageView
-	android:id="@+id/imageView"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@+id/imageView"
 	android:layout_width="@dimen/message_bubble_image_default"
 	android:layout_height="@dimen/message_bubble_image_default"
 	android:scaleType="centerCrop"
 	tools:ignore="ContentDescription"
-	tools:srcCompat="@tools:sample/avatars"/>
+	tools:srcCompat="@tools:sample/avatars" />
diff --git a/briar-android/src/main/res/layout/list_item_image_preview.xml b/briar-android/src/main/res/layout/list_item_image_preview.xml
index 86c8d56ad..03d789c3d 100644
--- a/briar-android/src/main/res/layout/list_item_image_preview.xml
+++ b/briar-android/src/main/res/layout/list_item_image_preview.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="wrap_content"
@@ -16,7 +15,7 @@
 		app:layout_constraintBottom_toBottomOf="parent"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
-		app:layout_constraintTop_toTopOf="parent"/>
+		app:layout_constraintTop_toTopOf="parent" />
 
 	<ImageView
 		android:id="@+id/imageView"
@@ -30,6 +29,6 @@
 		app:layout_constraintTop_toTopOf="parent"
 		tools:ignore="ContentDescription"
 		tools:srcCompat="@tools:sample/avatars"
-		tools:visibility="visible"/>
+		tools:visibility="visible" />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/briar-android/src/main/res/layout/list_item_image_preview_single.xml b/briar-android/src/main/res/layout/list_item_image_preview_single.xml
index 038e52bbc..9fbdbd710 100644
--- a/briar-android/src/main/res/layout/list_item_image_preview_single.xml
+++ b/briar-android/src/main/res/layout/list_item_image_preview_single.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -16,7 +15,7 @@
 		app:layout_constraintBottom_toBottomOf="parent"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
-		app:layout_constraintTop_toTopOf="parent"/>
+		app:layout_constraintTop_toTopOf="parent" />
 
 	<ImageView
 		android:id="@+id/imageView"
@@ -28,6 +27,6 @@
 		app:layout_constraintTop_toTopOf="parent"
 		tools:ignore="ContentDescription"
 		tools:srcCompat="@tools:sample/backgrounds/scenic"
-		tools:visibility="visible"/>
+		tools:visibility="visible" />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/briar-android/src/main/res/layout/list_item_invitations.xml b/briar-android/src/main/res/layout/list_item_invitations.xml
index ff585d06a..d155185ef 100644
--- a/briar-android/src/main/res/layout/list_item_invitations.xml
+++ b/briar-android/src/main/res/layout/list_item_invitations.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -12,52 +11,52 @@
 		android:layout_height="@dimen/listitem_picture_frame_size"
 		android:layout_margin="@dimen/listitem_horizontal_margin"
 		app:layout_constraintStart_toStartOf="parent"
-		app:layout_constraintTop_toTopOf="parent"/>
+		app:layout_constraintTop_toTopOf="parent" />
 
 	<com.vanniktech.emoji.EmojiTextView
 		android:id="@+id/forumNameView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
 		android:layout_margin="@dimen/listitem_horizontal_margin"
-		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
 		android:layout_marginStart="@dimen/listitem_horizontal_margin"
+		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
 		android:textColor="?android:attr/textColorPrimary"
 		android:textSize="@dimen/text_size_medium"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toEndOf="@+id/avatarView"
 		app:layout_constraintTop_toTopOf="parent"
-		tools:text="This is a name of a forum that is available and has a long name"/>
+		tools:text="This is a name of a forum that is available and has a long name" />
 
 	<com.vanniktech.emoji.EmojiTextView
 		android:id="@+id/sharedByView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
+		android:layout_marginTop="@dimen/margin_medium"
 		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
 		android:layout_marginRight="@dimen/listitem_horizontal_margin"
-		android:layout_marginTop="@dimen/margin_medium"
 		android:textColor="?android:attr/textColorSecondary"
 		android:textSize="@dimen/text_size_small"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="@+id/forumNameView"
 		app:layout_constraintTop_toBottomOf="@+id/forumNameView"
-		tools:text="Shared by Megalox"/>
+		tools:text="Shared by Megalox" />
 
 	<TextView
 		android:id="@+id/forumSubscribedView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
-		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
-		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:layout_marginStart="@dimen/listitem_horizontal_margin"
+		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
 		android:layout_marginTop="@dimen/margin_medium"
+		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
+		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:text="@string/forum_invitation_exists"
 		android:textColor="?android:attr/textColorTertiary"
 		android:textSize="@dimen/text_size_small"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/sharedByView"
-		tools:visibility="visible"/>
+		tools:visibility="visible" />
 
 	<Button
 		android:id="@+id/acceptButton"
@@ -66,7 +65,7 @@
 		android:layout_height="wrap_content"
 		android:text="@string/accept"
 		app:layout_constraintEnd_toEndOf="parent"
-		app:layout_constraintTop_toBottomOf="@+id/forumSubscribedView"/>
+		app:layout_constraintTop_toBottomOf="@+id/forumSubscribedView" />
 
 	<Button
 		android:id="@+id/declineButton"
@@ -75,12 +74,12 @@
 		android:layout_height="wrap_content"
 		android:text="@string/decline"
 		app:layout_constraintEnd_toStartOf="@+id/acceptButton"
-		app:layout_constraintTop_toBottomOf="@+id/forumSubscribedView"/>
+		app:layout_constraintTop_toBottomOf="@+id/forumSubscribedView" />
 
 	<View
 		android:id="@+id/divider"
 		style="@style/Divider.ThreadItem"
 		app:layout_constraintStart_toStartOf="parent"
-		app:layout_constraintTop_toBottomOf="@+id/acceptButton"/>
+		app:layout_constraintTop_toBottomOf="@+id/acceptButton" />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/briar-android/src/main/res/layout/list_item_pending_contact.xml b/briar-android/src/main/res/layout/list_item_pending_contact.xml
index c83c45dd3..13b98bbae 100644
--- a/briar-android/src/main/res/layout/list_item_pending_contact.xml
+++ b/briar-android/src/main/res/layout/list_item_pending_contact.xml
@@ -1,9 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	android:id="@+id/linearLayout4"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@+id/linearLayout4"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content">
 
@@ -11,19 +10,19 @@
 		android:id="@+id/avatar"
 		android:layout_width="@dimen/listitem_picture_frame_size"
 		android:layout_height="@dimen/listitem_picture_frame_size"
-		android:layout_marginBottom="@dimen/listitem_horizontal_margin"
-		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
 		android:layout_marginStart="@dimen/listitem_horizontal_margin"
+		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
 		android:layout_marginTop="@dimen/listitem_horizontal_margin"
+		android:layout_marginBottom="@dimen/listitem_horizontal_margin"
 		app:layout_constraintStart_toStartOf="parent"
-		app:layout_constraintTop_toTopOf="parent"/>
+		app:layout_constraintTop_toTopOf="parent" />
 
 	<com.vanniktech.emoji.EmojiTextView
 		android:id="@+id/name"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
-		android:layout_marginLeft="@dimen/margin_large"
 		android:layout_marginStart="@dimen/margin_large"
+		android:layout_marginLeft="@dimen/margin_large"
 		android:layout_marginTop="@dimen/margin_large"
 		android:textColor="?android:attr/textColorPrimary"
 		android:textSize="@dimen/text_size_medium"
@@ -34,9 +33,9 @@
 		app:layout_constraintStart_toEndOf="@+id/avatar"
 		app:layout_constraintTop_toTopOf="parent"
 		app:layout_constraintVertical_chainStyle="packed"
-		tools:text="This is a name of a contact"/>
+		tools:text="This is a name of a contact" />
 
-	<android.support.v7.widget.AppCompatImageButton
+	<androidx.appcompat.widget.AppCompatImageButton
 		android:id="@+id/removeButton"
 		android:layout_width="@dimen/button_size"
 		android:layout_height="@dimen/button_size"
@@ -46,30 +45,30 @@
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toEndOf="@+id/name"
 		app:layout_constraintTop_toTopOf="parent"
-		app:tint="?attr/colorControlNormal"/>
+		app:tint="?attr/colorControlNormal" />
 
 	<TextView
 		android:id="@+id/status"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
+		android:layout_marginTop="8dp"
 		android:layout_marginEnd="16dp"
 		android:layout_marginRight="16dp"
-		android:layout_marginTop="8dp"
 		android:text="@string/adding_contact_failed"
 		app:layout_constrainedWidth="true"
 		app:layout_constraintBottom_toTopOf="@+id/divider"
 		app:layout_constraintEnd_toStartOf="@+id/time"
 		app:layout_constraintStart_toStartOf="@+id/name"
 		app:layout_constraintTop_toBottomOf="@+id/name"
-		tools:textColor="@color/briar_red"/>
+		tools:textColor="@color/briar_red" />
 
 	<TextView
 		android:id="@+id/time"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
+		android:layout_marginTop="0dp"
 		android:layout_marginEnd="@dimen/margin_large"
 		android:layout_marginRight="@dimen/margin_large"
-		android:layout_marginTop="0dp"
 		android:textColor="?android:attr/textColorSecondary"
 		android:textSize="@dimen/text_size_small"
 		app:layout_constraintBottom_toTopOf="@+id/divider"
@@ -77,17 +76,17 @@
 		app:layout_constraintStart_toEndOf="@+id/status"
 		app:layout_constraintTop_toTopOf="@+id/status"
 		app:layout_constraintVertical_bias="0.0"
-		tools:text="Dec 24"/>
+		tools:text="Dec 24" />
 
 	<View
 		android:id="@+id/divider"
 		style="@style/Divider.ContactList"
 		android:layout_width="0dp"
-		android:layout_marginLeft="8dp"
 		android:layout_marginStart="8dp"
+		android:layout_marginLeft="8dp"
 		android:layout_marginTop="@dimen/margin_large"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toEndOf="@+id/avatar"
-		app:layout_constraintTop_toBottomOf="@+id/status"/>
+		app:layout_constraintTop_toBottomOf="@+id/status" />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/briar-android/src/main/res/layout/list_item_revealable_contact.xml b/briar-android/src/main/res/layout/list_item_revealable_contact.xml
index 7a0832b6b..059077098 100644
--- a/briar-android/src/main/res/layout/list_item_revealable_contact.xml
+++ b/briar-android/src/main/res/layout/list_item_revealable_contact.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -16,46 +15,46 @@
 		app:layout_constraintBottom_toTopOf="@+id/divider"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
-		tools:src="@mipmap/ic_launcher_round"/>
+		tools:src="@mipmap/ic_launcher_round" />
 
 	<com.vanniktech.emoji.EmojiTextView
 		android:id="@+id/nameView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
-		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
-		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:layout_marginStart="@dimen/listitem_horizontal_margin"
+		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
 		android:layout_marginTop="@dimen/listitem_vertical_margin"
+		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
+		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:textColor="?android:attr/textColorPrimary"
 		android:textSize="@dimen/text_size_medium"
 		app:layout_constraintEnd_toStartOf="@+id/checkBox"
 		app:layout_constraintStart_toEndOf="@+id/avatarView"
 		app:layout_constraintTop_toTopOf="parent"
-		tools:text="Revealable Contact with a long name"/>
+		tools:text="Revealable Contact with a long name" />
 
-	<android.support.v7.widget.AppCompatImageView
+	<androidx.appcompat.widget.AppCompatImageView
 		android:id="@+id/visibilityView"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
-		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
 		android:layout_marginStart="@dimen/listitem_horizontal_margin"
+		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
 		android:layout_marginTop="4dp"
 		android:src="@drawable/ic_visibility"
 		app:layout_constraintStart_toEndOf="@+id/avatarView"
 		app:layout_constraintTop_toBottomOf="@+id/nameView"
 		app:tint="?attr/colorControlNormal"
-		tools:ignore="ContentDescription"/>
+		tools:ignore="ContentDescription" />
 
 	<TextView
 		android:id="@+id/infoView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginBottom="@dimen/listitem_vertical_margin"
-		android:layout_marginEnd="@dimen/margin_small"
-		android:layout_marginLeft="@dimen/margin_small"
-		android:layout_marginRight="@dimen/margin_small"
 		android:layout_marginStart="@dimen/margin_small"
+		android:layout_marginLeft="@dimen/margin_small"
+		android:layout_marginEnd="@dimen/margin_small"
+		android:layout_marginRight="@dimen/margin_small"
+		android:layout_marginBottom="@dimen/listitem_vertical_margin"
 		android:text="@string/groups_reveal_visible"
 		android:textColor="?android:attr/textColorSecondary"
 		android:textSize="@dimen/text_size_small"
@@ -63,7 +62,7 @@
 		app:layout_constraintEnd_toStartOf="@+id/checkBox"
 		app:layout_constraintStart_toEndOf="@+id/visibilityView"
 		app:layout_constraintTop_toTopOf="@+id/visibilityView"
-		tools:visibility="visible"/>
+		tools:visibility="visible" />
 
 	<CheckBox
 		android:id="@+id/checkBox"
@@ -73,15 +72,15 @@
 		android:clickable="false"
 		app:layout_constraintBottom_toTopOf="@+id/divider"
 		app:layout_constraintEnd_toEndOf="parent"
-		app:layout_constraintTop_toTopOf="parent"/>
+		app:layout_constraintTop_toTopOf="parent" />
 
 	<View
 		android:id="@+id/divider"
 		style="@style/Divider.ContactList"
 		android:layout_width="0dp"
-		android:layout_marginLeft="@dimen/margin_medium"
 		android:layout_marginStart="@dimen/margin_medium"
+		android:layout_marginLeft="@dimen/margin_medium"
 		app:layout_constraintBottom_toBottomOf="parent"
-		app:layout_constraintStart_toEndOf="@id/avatarView"/>
+		app:layout_constraintStart_toEndOf="@id/avatarView" />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/briar-android/src/main/res/layout/list_item_rss_feed.xml b/briar-android/src/main/res/layout/list_item_rss_feed.xml
index e16f18448..81414aa96 100644
--- a/briar-android/src/main/res/layout/list_item_rss_feed.xml
+++ b/briar-android/src/main/res/layout/list_item_rss_feed.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -11,17 +10,17 @@
 		android:id="@+id/titleView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
 		android:layout_marginStart="@dimen/listitem_horizontal_margin"
+		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
 		android:layout_marginTop="@dimen/listitem_horizontal_margin"
 		android:textColor="?android:attr/textColorPrimary"
 		android:textSize="@dimen/text_size_medium"
 		app:layout_constraintEnd_toStartOf="@+id/deleteButton"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
-		tools:text="This is a name of a RSS Feed that can be long"/>
+		tools:text="This is a name of a RSS Feed that can be long" />
 
-	<android.support.v7.widget.AppCompatImageButton
+	<androidx.appcompat.widget.AppCompatImageButton
 		android:id="@+id/deleteButton"
 		android:layout_width="@dimen/button_size"
 		android:layout_height="@dimen/button_size"
@@ -31,7 +30,7 @@
 		android:src="@drawable/action_delete_black"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
-		app:tint="?attr/colorControlNormal"/>
+		app:tint="?attr/colorControlNormal" />
 
 	<TextView
 		android:id="@+id/author"
@@ -42,22 +41,22 @@
 		android:textColor="?android:attr/textColorSecondary"
 		android:textSize="@dimen/text_size_small"
 		app:layout_constraintStart_toStartOf="@+id/titleView"
-		app:layout_constraintTop_toBottomOf="@+id/titleView"/>
+		app:layout_constraintTop_toBottomOf="@+id/titleView" />
 
 	<com.vanniktech.emoji.EmojiTextView
 		android:id="@+id/authorView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
-		android:layout_marginLeft="@dimen/margin_small"
-		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:layout_marginStart="@dimen/margin_small"
+		android:layout_marginLeft="@dimen/margin_small"
+		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
+		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:textColor="?android:attr/textColorSecondary"
 		android:textSize="@dimen/text_size_small"
 		app:layout_constraintBaseline_toBaselineOf="@+id/author"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toEndOf="@+id/author"
-		tools:text="Bruce Schneier"/>
+		tools:text="Bruce Schneier" />
 
 	<TextView
 		android:id="@+id/imported"
@@ -68,22 +67,22 @@
 		android:textColor="?android:attr/textColorSecondary"
 		android:textSize="@dimen/text_size_small"
 		app:layout_constraintStart_toStartOf="@+id/titleView"
-		app:layout_constraintTop_toBottomOf="@+id/author"/>
+		app:layout_constraintTop_toBottomOf="@+id/author" />
 
 	<TextView
 		android:id="@+id/importedView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
-		android:layout_marginLeft="@dimen/margin_small"
-		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:layout_marginStart="@dimen/margin_small"
+		android:layout_marginLeft="@dimen/margin_small"
+		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
+		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:textColor="?android:attr/textColorSecondary"
 		android:textSize="@dimen/text_size_small"
 		app:layout_constraintBaseline_toBaselineOf="@+id/imported"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toEndOf="@+id/imported"
-		tools:text="July 4"/>
+		tools:text="July 4" />
 
 	<TextView
 		android:id="@+id/updated"
@@ -94,44 +93,44 @@
 		android:textColor="?android:attr/textColorSecondary"
 		android:textSize="@dimen/text_size_small"
 		app:layout_constraintStart_toStartOf="@+id/titleView"
-		app:layout_constraintTop_toBottomOf="@+id/imported"/>
+		app:layout_constraintTop_toBottomOf="@+id/imported" />
 
 	<TextView
 		android:id="@+id/updatedView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
-		android:layout_marginLeft="@dimen/margin_small"
-		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:layout_marginStart="@dimen/margin_small"
+		android:layout_marginLeft="@dimen/margin_small"
+		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
+		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:textColor="?android:attr/textColorSecondary"
 		android:textSize="@dimen/text_size_small"
 		app:layout_constraintBottom_toBottomOf="@+id/updated"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toEndOf="@+id/updated"
-		tools:text="5 min. ago"/>
+		tools:text="5 min. ago" />
 
 	<com.vanniktech.emoji.EmojiTextView
 		android:id="@+id/descriptionView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
-		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
-		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:layout_marginStart="@dimen/listitem_horizontal_margin"
+		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
 		android:layout_marginTop="@dimen/margin_medium"
+		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
+		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:textColor="?android:attr/textColorSecondary"
 		android:textSize="@dimen/text_size_small"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toBottomOf="@+id/updated"
-		tools:text="This is a description of the RSS feed. It can be several lines long, but it can also not exist at all if it is not present in the feed itself."/>
+		tools:text="This is a description of the RSS feed. It can be several lines long, but it can also not exist at all if it is not present in the feed itself." />
 
 	<View
 		style="@style/Divider.ThreadItem"
 		android:layout_marginTop="@dimen/listitem_horizontal_margin"
 		app:layout_constraintStart_toStartOf="parent"
-		app:layout_constraintTop_toBottomOf="@+id/descriptionView"/>
+		app:layout_constraintTop_toBottomOf="@+id/descriptionView" />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
 
diff --git a/briar-android/src/main/res/layout/list_item_selectable_contact.xml b/briar-android/src/main/res/layout/list_item_selectable_contact.xml
index 7c06e1033..52e280a4f 100644
--- a/briar-android/src/main/res/layout/list_item_selectable_contact.xml
+++ b/briar-android/src/main/res/layout/list_item_selectable_contact.xml
@@ -1,9 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-	android:id="@+id/linearLayout2"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@+id/linearLayout2"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content"
 	android:background="?attr/selectableItemBackground">
@@ -17,17 +16,17 @@
 		app:layout_constraintBottom_toBottomOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
-		tools:src="@mipmap/ic_launcher_round"/>
+		tools:src="@mipmap/ic_launcher_round" />
 
 	<com.vanniktech.emoji.EmojiTextView
 		android:id="@+id/nameView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
-		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
-		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:layout_marginStart="@dimen/listitem_horizontal_margin"
+		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
 		android:layout_marginTop="@dimen/listitem_horizontal_margin"
+		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
+		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:textColor="?android:attr/textColorPrimary"
 		android:textSize="@dimen/text_size_medium"
 		app:layout_constraintBottom_toTopOf="@+id/infoView"
@@ -36,17 +35,17 @@
 		app:layout_constraintTop_toTopOf="parent"
 		app:layout_constraintVertical_chainStyle="packed"
 		app:layout_goneMarginBottom="@dimen/listitem_horizontal_margin"
-		tools:text="This is a name of a contact with a long name"/>
+		tools:text="This is a name of a contact with a long name" />
 
 	<TextView
 		android:id="@+id/infoView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginBottom="@dimen/listitem_horizontal_margin"
-		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
-		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
-		android:layout_marginRight="@dimen/listitem_horizontal_margin"
 		android:layout_marginStart="@dimen/listitem_horizontal_margin"
+		android:layout_marginLeft="@dimen/listitem_horizontal_margin"
+		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
+		android:layout_marginRight="@dimen/listitem_horizontal_margin"
+		android:layout_marginBottom="@dimen/listitem_horizontal_margin"
 		android:maxLines="2"
 		android:text="@string/forum_invitation_already_sharing"
 		android:textColor="?android:attr/textColorTertiary"
@@ -55,7 +54,7 @@
 		app:layout_constraintEnd_toEndOf="@+id/checkBox"
 		app:layout_constraintStart_toEndOf="@+id/avatarView"
 		app:layout_constraintTop_toBottomOf="@+id/nameView"
-		tools:visibility="visible"/>
+		tools:visibility="visible" />
 
 	<CheckBox
 		android:id="@+id/checkBox"
@@ -65,15 +64,15 @@
 		android:clickable="false"
 		app:layout_constraintBottom_toBottomOf="parent"
 		app:layout_constraintEnd_toEndOf="parent"
-		app:layout_constraintTop_toTopOf="parent"/>
+		app:layout_constraintTop_toTopOf="parent" />
 
 	<View
 		android:id="@+id/divider"
 		style="@style/Divider.ContactList"
 		android:layout_width="0dp"
-		android:layout_marginLeft="@dimen/margin_medium"
 		android:layout_marginStart="@dimen/margin_medium"
+		android:layout_marginLeft="@dimen/margin_medium"
 		app:layout_constraintBottom_toBottomOf="parent"
-		app:layout_constraintStart_toEndOf="@id/avatarView"/>
+		app:layout_constraintStart_toEndOf="@id/avatarView" />
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/list_item_thread.xml b/briar-android/src/main/res/layout/list_item_thread.xml
index 97cd6d3e6..a248c5474 100644
--- a/briar-android/src/main/res/layout/list_item_thread.xml
+++ b/briar-android/src/main/res/layout/list_item_thread.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -8,7 +7,7 @@
 	android:baselineAligned="false"
 	android:orientation="horizontal">
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:layout_width="wrap_content"
 		android:layout_height="match_parent"
 		android:background="@drawable/list_item_thread_background">
@@ -18,34 +17,34 @@
 			style="@style/DiscussionLevelIndicator"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toTopOf="parent"
-			tools:visibility="visible"/>
+			tools:visibility="visible" />
 
 		<View
 			android:id="@+id/nested_line_2"
 			style="@style/DiscussionLevelIndicator"
 			app:layout_constraintStart_toEndOf="@id/nested_line_1"
 			app:layout_constraintTop_toTopOf="parent"
-			tools:visibility="visible"/>
+			tools:visibility="visible" />
 
 		<View
 			android:id="@+id/nested_line_3"
 			style="@style/DiscussionLevelIndicator"
 			app:layout_constraintStart_toEndOf="@id/nested_line_2"
 			app:layout_constraintTop_toTopOf="parent"
-			tools:visibility="visible"/>
+			tools:visibility="visible" />
 
 		<View
 			android:id="@+id/nested_line_4"
 			style="@style/DiscussionLevelIndicator"
 			app:layout_constraintStart_toEndOf="@id/nested_line_3"
-			app:layout_constraintTop_toTopOf="parent"/>
+			app:layout_constraintTop_toTopOf="parent" />
 
 		<View
 			android:id="@+id/nested_line_5"
 			style="@style/DiscussionLevelIndicator"
 			app:layout_constraintStart_toEndOf="@id/nested_line_4"
 			app:layout_constraintTop_toTopOf="parent"
-			tools:visibility="visible"/>
+			tools:visibility="visible" />
 
 		<TextView
 			android:id="@+id/nested_line_text"
@@ -60,11 +59,11 @@
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toTopOf="parent"
 			tools:text="42"
-			tools:visibility="visible"/>
+			tools:visibility="visible" />
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:id="@+id/layout"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
@@ -75,37 +74,37 @@
 			android:id="@+id/divider"
 			style="@style/Divider.ThreadItem"
 			app:layout_constraintLeft_toLeftOf="parent"
-			app:layout_constraintTop_toTopOf="parent"/>
+			app:layout_constraintTop_toTopOf="parent" />
 
 		<org.briarproject.briar.android.view.AuthorView
 			android:id="@+id/author"
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
-			android:paddingEnd="@dimen/margin_medium"
-			android:paddingLeft="@dimen/margin_medium"
-			android:paddingRight="@dimen/margin_medium"
 			android:paddingStart="@dimen/margin_medium"
+			android:paddingLeft="@dimen/margin_medium"
 			android:paddingTop="@dimen/margin_medium"
+			android:paddingEnd="@dimen/margin_medium"
+			android:paddingRight="@dimen/margin_medium"
 			app:layout_constraintBottom_toBottomOf="@+id/text"
 			app:layout_constraintEnd_toStartOf="@+id/btn_reply"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/divider"
 			app:layout_constraintVertical_bias="0.0"
-			app:persona="commenter"/>
+			app:persona="commenter" />
 
 		<TextView
 			android:id="@+id/btn_reply"
 			style="@style/BriarButtonFlat.Positive.Tiny"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
-			android:paddingEnd="@dimen/margin_medium"
-			android:paddingLeft="@dimen/margin_medium"
-			android:paddingRight="@dimen/margin_medium"
 			android:paddingStart="@dimen/margin_medium"
+			android:paddingLeft="@dimen/margin_medium"
+			android:paddingEnd="@dimen/margin_medium"
+			android:paddingRight="@dimen/margin_medium"
 			android:text="@string/btn_reply"
 			android:textSize="@dimen/text_size_tiny"
 			app:layout_constraintEnd_toEndOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/divider"/>
+			app:layout_constraintTop_toBottomOf="@+id/divider" />
 
 		<com.vanniktech.emoji.EmojiTextView
 			android:id="@+id/text"
@@ -119,8 +118,8 @@
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@id/author"
-			tools:text="Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua."/>
+			tools:text="Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua." />
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 
 </LinearLayout>
diff --git a/briar-android/src/main/res/layout/list_item_transport.xml b/briar-android/src/main/res/layout/list_item_transport.xml
index 80022b327..6af9e1688 100644
--- a/briar-android/src/main/res/layout/list_item_transport.xml
+++ b/briar-android/src/main/res/layout/list_item_transport.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content"
@@ -15,7 +14,7 @@
 		android:layout_height="wrap_content"
 		android:padding="@dimen/margin_small"
 		tools:ignore="ContentDescription"
-		tools:src="@drawable/transport_tor"/>
+		tools:src="@drawable/transport_tor" />
 
 	<TextView
 		android:id="@+id/textView"
@@ -23,6 +22,6 @@
 		android:layout_height="match_parent"
 		android:padding="@dimen/margin_small"
 		android:textColor="?android:attr/textColorSecondary"
-		tools:text="@string/transport_tor"/>
+		tools:text="@string/transport_tor" />
 
 </LinearLayout>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/navigation_header.xml b/briar-android/src/main/res/layout/navigation_header.xml
index fe37468d6..92a452e94 100644
--- a/briar-android/src/main/res/layout/navigation_header.xml
+++ b/briar-android/src/main/res/layout/navigation_header.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<FrameLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="85dp"
@@ -11,12 +10,12 @@
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
 		android:layout_gravity="bottom|start"
-		android:layout_marginBottom="@dimen/margin_medium"
-		android:layout_marginEnd="@dimen/margin_medium"
-		android:layout_marginLeft="@dimen/margin_medium"
-		android:layout_marginRight="@dimen/margin_medium"
 		android:layout_marginStart="@dimen/margin_medium"
+		android:layout_marginLeft="@dimen/margin_medium"
+		android:layout_marginEnd="@dimen/margin_medium"
+		android:layout_marginRight="@dimen/margin_medium"
+		android:layout_marginBottom="@dimen/margin_medium"
 		android:contentDescription="@string/app_name"
-		android:src="@drawable/navigation_drawer_header"/>
+		android:src="@drawable/navigation_drawer_header" />
 
 </FrameLayout>
diff --git a/briar-android/src/main/res/layout/navigation_menu.xml b/briar-android/src/main/res/layout/navigation_menu.xml
index 8a2162914..4a7a32c4f 100644
--- a/briar-android/src/main/res/layout/navigation_menu.xml
+++ b/briar-android/src/main/res/layout/navigation_menu.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<ScrollView
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="wrap_content"
@@ -9,11 +8,11 @@
 	android:fillViewport="true"
 	android:orientation="vertical">
 
-	<android.support.constraint.ConstraintLayout
+	<androidx.constraintlayout.widget.ConstraintLayout
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content">
 
-		<android.support.design.widget.NavigationView
+		<com.google.android.material.navigation.NavigationView
 			android:id="@+id/navigation"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
@@ -25,7 +24,7 @@
 			app:itemTextColor="?android:textColorPrimary"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toTopOf="parent"
-			app:menu="@menu/navigation_drawer"/>
+			app:menu="@menu/navigation_drawer" />
 
 		<View
 			android:id="@+id/divider1"
@@ -33,7 +32,7 @@
 			android:layout_width="0dp"
 			app:layout_constraintEnd_toEndOf="@+id/navigation"
 			app:layout_constraintStart_toStartOf="parent"
-			app:layout_constraintTop_toBottomOf="@+id/navigation"/>
+			app:layout_constraintTop_toBottomOf="@+id/navigation" />
 
 		<View
 			android:id="@+id/spacer"
@@ -42,7 +41,7 @@
 			app:layout_constraintBottom_toTopOf="@+id/transports"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/divider1"
-			app:layout_constraintVertical_weight="1"/>
+			app:layout_constraintVertical_weight="1" />
 
 		<include
 			android:id="@+id/transports"
@@ -53,8 +52,8 @@
 			app:layout_constraintEnd_toEndOf="@+id/navigation"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/spacer"
-			tools:layout_height="75dp"/>
+			tools:layout_height="75dp" />
 
-	</android.support.constraint.ConstraintLayout>
+	</androidx.constraintlayout.widget.ConstraintLayout>
 
 </ScrollView>
diff --git a/briar-android/src/main/res/layout/power_view.xml b/briar-android/src/main/res/layout/power_view.xml
index 51f8a311c..cf558ce54 100644
--- a/briar-android/src/main/res/layout/power_view.xml
+++ b/briar-android/src/main/res/layout/power_view.xml
@@ -1,28 +1,27 @@
 <?xml version="1.0" encoding="utf-8"?>
-<merge
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<merge xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content"
-	tools:parentTag="android.support.constraint.ConstraintLayout">
+	tools:parentTag="androidx.constraintlayout.widget.ConstraintLayout">
 
 	<TextView
 		android:id="@+id/textView"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="@dimen/margin_large"
-		android:layout_marginLeft="@dimen/margin_large"
-		android:layout_marginRight="@dimen/margin_large"
 		android:layout_marginStart="@dimen/margin_large"
+		android:layout_marginLeft="@dimen/margin_large"
 		android:layout_marginTop="@dimen/margin_medium"
+		android:layout_marginEnd="@dimen/margin_large"
+		android:layout_marginRight="@dimen/margin_large"
 		android:textSize="@dimen/text_size_medium"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
-		tools:text="@string/setup_huawei_text"/>
+		tools:text="@string/setup_huawei_text" />
 
-	<android.support.v7.widget.AppCompatImageView
+	<androidx.appcompat.widget.AppCompatImageView
 		android:id="@+id/checkImage"
 		android:layout_width="24dp"
 		android:layout_height="24dp"
@@ -33,7 +32,7 @@
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="@+id/button"
 		app:tint="?attr/colorControlNormal"
-		tools:ignore="ContentDescription"/>
+		tools:ignore="ContentDescription" />
 
 	<Button
 		android:id="@+id/button"
@@ -44,7 +43,7 @@
 		app:layout_constraintEnd_toStartOf="@+id/helpButton"
 		app:layout_constraintStart_toEndOf="@+id/checkImage"
 		app:layout_constraintTop_toBottomOf="@+id/textView"
-		tools:text="@string/setup_huawei_button"/>
+		tools:text="@string/setup_huawei_button" />
 
 	<ImageButton
 		android:id="@+id/helpButton"
@@ -57,6 +56,6 @@
 		android:tint="@color/briar_button_text_positive"
 		app:layout_constraintBottom_toBottomOf="@+id/button"
 		app:layout_constraintEnd_toEndOf="parent"
-		app:layout_constraintTop_toTopOf="@+id/button"/>
+		app:layout_constraintTop_toTopOf="@+id/button" />
 
 </merge>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/preference_switch_compat.xml b/briar-android/src/main/res/layout/preference_switch_compat.xml
index de1f7c770..7ebf4bbbe 100644
--- a/briar-android/src/main/res/layout/preference_switch_compat.xml
+++ b/briar-android/src/main/res/layout/preference_switch_compat.xml
@@ -1,13 +1,11 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Needed for SwitchPreference on Android 4 (API < 21)-->
-<android.support.v7.widget.SwitchCompat
-	android:id="@android:id/switch_widget"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<?xml version="1.0" encoding="utf-8"?><!-- Needed for SwitchPreference on Android 4 (API < 21)-->
+<androidx.appcompat.widget.SwitchCompat xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@android:id/switch_widget"
 	android:layout_width="wrap_content"
 	android:layout_height="wrap_content"
 	android:background="@null"
 	android:clickable="false"
 	android:focusable="false"
 	android:focusableInTouchMode="false"
-	tools:targetApi="n"/>
+	tools:targetApi="n" />
diff --git a/briar-android/src/main/res/layout/preferences_category.xml b/briar-android/src/main/res/layout/preferences_category.xml
index 853d70872..fe5605daa 100644
--- a/briar-android/src/main/res/layout/preferences_category.xml
+++ b/briar-android/src/main/res/layout/preferences_category.xml
@@ -1,8 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
-<TextView
-	android:id="@android:id/title"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<TextView xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:tools="http://schemas.android.com/tools"
+	android:id="@android:id/title"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content"
 	android:background="@color/preference_category_background"
@@ -10,4 +9,4 @@
 	android:textColor="@color/briar_accent"
 	android:textSize="14sp"
 	android:textStyle="bold"
-	tools:text="@string/security_settings_title"/>
\ No newline at end of file
+	tools:text="@string/security_settings_title" />
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/qr_code_view.xml b/briar-android/src/main/res/layout/qr_code_view.xml
index 95d2d8189..351ad5765 100644
--- a/briar-android/src/main/res/layout/qr_code_view.xml
+++ b/briar-android/src/main/res/layout/qr_code_view.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<merge
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<merge xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:tools="http://schemas.android.com/tools"
 	tools:showIn="@layout/fragment_keyagreement_qr">
 
@@ -8,14 +7,14 @@
 		style="?android:attr/progressBarStyleLarge"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
-		android:layout_gravity="center"/>
+		android:layout_gravity="center" />
 
 	<ImageView
 		android:id="@+id/qr_code"
 		android:layout_width="match_parent"
 		android:layout_height="match_parent"
 		android:contentDescription="@string/qr_code"
-		android:scaleType="fitCenter"/>
+		android:scaleType="fitCenter" />
 
 	<ImageView
 		android:id="@+id/fullscreen_button"
@@ -26,6 +25,6 @@
 		android:alpha="0.54"
 		android:background="?attr/selectableItemBackground"
 		android:contentDescription="@string/show_qr_code_fullscreen"
-		android:src="@drawable/ic_fullscreen_black_48dp"/>
+		android:src="@drawable/ic_fullscreen_black_48dp" />
 
 </merge>
diff --git a/briar-android/src/main/res/layout/splash.xml b/briar-android/src/main/res/layout/splash.xml
index 9466f9a0e..410dbb74d 100644
--- a/briar-android/src/main/res/layout/splash.xml
+++ b/briar-android/src/main/res/layout/splash.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<FrameLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent">
 
@@ -10,6 +9,6 @@
 		android:layout_gravity="center"
 		android:layout_margin="@dimen/margin_xxlarge"
 		android:contentDescription="@string/app_name"
-		android:src="@drawable/splash_screen"/>
+		android:src="@drawable/splash_screen" />
 
 </FrameLayout>
diff --git a/briar-android/src/main/res/layout/text_avatar_view.xml b/briar-android/src/main/res/layout/text_avatar_view.xml
index 2644bdfe6..39950a35e 100644
--- a/briar-android/src/main/res/layout/text_avatar_view.xml
+++ b/briar-android/src/main/res/layout/text_avatar_view.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<merge
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<merge xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:tools="http://schemas.android.com/tools"
 	tools:showIn="@layout/list_item_forum">
 
@@ -10,16 +9,16 @@
 		android:layout_width="@dimen/avatar_forum_size"
 		android:layout_height="@dimen/avatar_forum_size"
 		android:layout_gravity="bottom|left|start"
-		tools:src="@color/briar_button_text_positive"/>
+		tools:src="@color/briar_button_text_positive" />
 
-	<android.support.v7.widget.AppCompatTextView
+	<androidx.appcompat.widget.AppCompatTextView
 		android:id="@+id/textAvatarView"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
 		android:layout_gravity="center"
+		android:layout_marginTop="@dimen/listitem_picture_frame_offset_vertical"
 		android:layout_marginEnd="@dimen/listitem_picture_frame_offset_horizontal"
 		android:layout_marginRight="@dimen/listitem_picture_frame_offset_horizontal"
-		android:layout_marginTop="@dimen/listitem_picture_frame_offset_vertical"
 		android:maxLength="1"
 		android:shadowColor="@color/forum_avatar_shadow"
 		android:shadowDx="0"
@@ -27,7 +26,7 @@
 		android:shadowRadius="1.5"
 		android:textColor="@color/briar_text_primary_inverse"
 		android:textSize="@dimen/avatar_text_size"
-		tools:text="T"/>
+		tools:text="T" />
 
 	<TextView
 		android:id="@+id/unreadCountView"
@@ -42,6 +41,6 @@
 		android:textStyle="bold"
 		android:visibility="invisible"
 		tools:text="12"
-		tools:visibility="visible"/>
+		tools:visibility="visible" />
 
 </merge>
diff --git a/briar-android/src/main/res/layout/text_input_view.xml b/briar-android/src/main/res/layout/text_input_view.xml
index 26028b376..353652ed9 100644
--- a/briar-android/src/main/res/layout/text_input_view.xml
+++ b/briar-android/src/main/res/layout/text_input_view.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<merge
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<merge xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
@@ -10,7 +9,7 @@
 
 	<View
 		style="@style/Divider.Horizontal"
-		android:layout_alignParentTop="true"/>
+		android:layout_alignParentTop="true" />
 
 	<LinearLayout
 		android:layout_width="match_parent"
@@ -22,13 +21,13 @@
 			android:layout_width="0dp"
 			android:layout_height="wrap_content"
 			android:layout_weight="1"
-			app:maxTextLines="4"/>
+			app:maxTextLines="4" />
 
 		<org.briarproject.briar.android.view.CompositeSendButton
 			android:id="@+id/compositeSendButton"
 			android:layout_width="@dimen/text_input_height"
 			android:layout_height="@dimen/text_input_height"
-			android:layout_gravity="bottom"/>
+			android:layout_gravity="bottom" />
 
 	</LinearLayout>
 
diff --git a/briar-android/src/main/res/layout/text_input_view_large.xml b/briar-android/src/main/res/layout/text_input_view_large.xml
index 9cf294733..076b6a6c1 100644
--- a/briar-android/src/main/res/layout/text_input_view_large.xml
+++ b/briar-android/src/main/res/layout/text_input_view_large.xml
@@ -1,21 +1,20 @@
 <?xml version="1.0" encoding="utf-8"?>
-<merge
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<merge xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content"
 	tools:showIn="@layout/fragment_reblog">
 
-	<android.support.v7.widget.CardView
+	<androidx.cardview.widget.CardView
 		android:id="@+id/input_layout"
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
-		android:layout_marginEnd="@dimen/margin_medium"
-		android:layout_marginLeft="@dimen/margin_medium"
-		android:layout_marginRight="@dimen/margin_medium"
 		android:layout_marginStart="@dimen/margin_medium"
+		android:layout_marginLeft="@dimen/margin_medium"
 		android:layout_marginTop="@dimen/margin_medium"
+		android:layout_marginEnd="@dimen/margin_medium"
+		android:layout_marginRight="@dimen/margin_medium"
 		android:elevation="@dimen/cardview_default_elevation"
 		android:minHeight="@dimen/text_input_height"
 		app:cardBackgroundColor="@color/card_background"
@@ -27,17 +26,17 @@
 			android:layout_width="match_parent"
 			android:layout_height="match_parent"
 			app:textPaddingBottom="10dp"
-			app:textPaddingEnd="@dimen/margin_medium"/>
+			app:textPaddingEnd="@dimen/margin_medium" />
 
-	</android.support.v7.widget.CardView>
+	</androidx.cardview.widget.CardView>
 
 	<Button
 		android:id="@+id/compositeSendButton"
 		style="@style/BriarButton"
-		android:layout_marginEnd="@dimen/margin_small"
-		android:layout_marginLeft="@dimen/margin_small"
-		android:layout_marginRight="@dimen/margin_small"
 		android:layout_marginStart="@dimen/margin_small"
-		tools:text="@string/send"/>
+		android:layout_marginLeft="@dimen/margin_small"
+		android:layout_marginEnd="@dimen/margin_small"
+		android:layout_marginRight="@dimen/margin_small"
+		tools:text="@string/send" />
 
 </merge>
diff --git a/briar-android/src/main/res/layout/toolbar.xml b/briar-android/src/main/res/layout/toolbar.xml
index e40212f95..72ee676f5 100644
--- a/briar-android/src/main/res/layout/toolbar.xml
+++ b/briar-android/src/main/res/layout/toolbar.xml
@@ -1,15 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.design.widget.AppBarLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<com.google.android.material.appbar.AppBarLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content"
 	tools:context="org.briarproject.briar.android.navdrawer.NavDrawerActivity">
 
-	<android.support.v7.widget.Toolbar
+	<androidx.appcompat.widget.Toolbar
 		android:id="@+id/toolbar"
 		style="@style/BriarToolbar"
 		android:layout_width="match_parent"
-		android:layout_height="wrap_content"/>
+		android:layout_height="wrap_content" />
 
-</android.support.design.widget.AppBarLayout>
+</com.google.android.material.appbar.AppBarLayout>
diff --git a/briar-android/src/main/res/layout/transports_list.xml b/briar-android/src/main/res/layout/transports_list.xml
index 17fd52a59..a484522c7 100644
--- a/briar-android/src/main/res/layout/transports_list.xml
+++ b/briar-android/src/main/res/layout/transports_list.xml
@@ -1,13 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content"
 	android:orientation="vertical"
 	tools:showIn="@layout/navigation_menu">
 
-	<View style="@style/Divider.Horizontal"/>
+	<View style="@style/Divider.Horizontal" />
 
 	<GridView
 		android:id="@+id/transportsView"
@@ -15,6 +14,6 @@
 		android:layout_height="wrap_content"
 		android:listSelector="@android:color/transparent"
 		android:numColumns="3"
-		tools:listitem="@layout/list_item_transport"/>
+		tools:listitem="@layout/list_item_transport" />
 
 </LinearLayout>
diff --git a/briar-android/src/main/res/layout/unread_message_button.xml b/briar-android/src/main/res/layout/unread_message_button.xml
index 53aa75097..196ee497d 100644
--- a/briar-android/src/main/res/layout/unread_message_button.xml
+++ b/briar-android/src/main/res/layout/unread_message_button.xml
@@ -1,25 +1,24 @@
 <?xml version="1.0" encoding="utf-8"?>
-<merge
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<merge xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	tools:showIn="@layout/activity_threaded_conversation">
 
-	<android.support.design.widget.FloatingActionButton
+	<com.google.android.material.floatingactionbutton.FloatingActionButton
 		android:id="@+id/fab"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
 		app:fabSize="mini"
-		app:useCompatPadding="true"/>
+		app:useCompatPadding="true" />
 
 	<TextView
 		android:id="@+id/unreadCountView"
 		android:layout_width="wrap_content"
 		android:layout_height="@dimen/unread_bubble_size"
 		android:layout_gravity="right|end|top"
+		android:layout_marginTop="10dp"
 		android:layout_marginEnd="5dp"
 		android:layout_marginRight="5dp"
-		android:layout_marginTop="10dp"
 		android:background="@drawable/bubble"
 		android:elevation="7dp"
 		android:gravity="center"
@@ -27,6 +26,6 @@
 		android:textColor="@color/briar_text_primary_inverse"
 		android:textSize="@dimen/unread_bubble_text_size"
 		android:textStyle="bold"
-		tools:text="12"/>
+		tools:text="12" />
 
 </merge>
\ No newline at end of file
diff --git a/briar-android/src/main/res/layout/view_composite_send_button.xml b/briar-android/src/main/res/layout/view_composite_send_button.xml
index 7c856bfa5..8ecfb1b81 100644
--- a/briar-android/src/main/res/layout/view_composite_send_button.xml
+++ b/briar-android/src/main/res/layout/view_composite_send_button.xml
@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<merge
-	xmlns:android="http://schemas.android.com/apk/res/android"
+<merge xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="@dimen/text_input_height"
@@ -9,7 +8,7 @@
 	tools:parentTag="org.briarproject.briar.android.view.CompositeSendButton"
 	tools:showIn="@layout/text_input_view">
 
-	<android.support.v7.widget.AppCompatImageButton
+	<androidx.appcompat.widget.AppCompatImageButton
 		android:id="@+id/imageButton"
 		android:layout_width="@dimen/text_input_height"
 		android:layout_height="@dimen/text_input_height"
@@ -22,9 +21,9 @@
 		android:scaleType="center"
 		android:src="@drawable/ic_image_off"
 		android:visibility="invisible"
-		app:tint="?attr/colorControlNormal"/>
+		app:tint="?attr/colorControlNormal" />
 
-	<android.support.v7.widget.AppCompatImageButton
+	<androidx.appcompat.widget.AppCompatImageButton
 		android:id="@+id/sendButton"
 		android:layout_width="@dimen/text_input_height"
 		android:layout_height="@dimen/text_input_height"
@@ -36,12 +35,12 @@
 		android:padding="4dp"
 		android:scaleType="center"
 		android:src="@drawable/social_send_now_white"
-		app:tint="@color/briar_accent"/>
+		app:tint="@color/briar_accent" />
 
 	<ProgressBar
 		android:id="@+id/progressBar"
 		android:layout_width="@dimen/text_input_height"
 		android:layout_height="@dimen/text_input_height"
-		android:visibility="invisible"/>
+		android:visibility="invisible" />
 
 </merge>
\ No newline at end of file
diff --git a/briar-android/src/main/res/values-ko/strings.xml b/briar-android/src/main/res/values-ko/strings.xml
index 4e2e77073..47d92fb71 100644
--- a/briar-android/src/main/res/values-ko/strings.xml
+++ b/briar-android/src/main/res/values-ko/strings.xml
@@ -280,7 +280,7 @@
   <string name="forum_invitation_response_declined_received">%s이(가) 포럼 초대장을 거절했습니다.</string>
   <string name="sharing_status">공유 상태</string>
   <string name="sharing_status_forum">포럼의 어느 구성원이든 연락처와 공유할 수 있습니다. 다음 연락처와 포럼을 공유하고 있습니다. 볼 수 없는 구성원이 더 있을 수 있습니다.</string>
-  <string name="shared_with">와(과) 공유하고 있습니다.(%1$d명 온라인)</string>
+  <string name="shared_with">와(과) 공유하고 있습니다.(%1$d %2$d명 온라인)</string>
   <plurals name="forums_shared">
     <item quantity="other">연락처와 공유한 %d개의 포럼</item>
   </plurals>
diff --git a/briar-android/src/screenshotDebug/AndroidManifest.xml b/briar-android/src/screenshotDebug/AndroidManifest.xml
index a35a0a5e5..d3e565327 100644
--- a/briar-android/src/screenshotDebug/AndroidManifest.xml
+++ b/briar-android/src/screenshotDebug/AndroidManifest.xml
@@ -1,17 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest
-	package="org.briarproject.briar"
-	xmlns:android="http://schemas.android.com/apk/res/android">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:tools="http://schemas.android.com/tools"
+	package="org.briarproject.briar">
 	<!-- The following permissions are only needed for taking automatic screenshots (fastlane) -->
 
 	<!-- Allows unlocking your device and activating its screen so UI tests can succeed -->
-	<uses-permission android:name="android.permission.DISABLE_KEYGUARD"/>
-	<uses-permission android:name="android.permission.WAKE_LOCK"/>
+	<uses-permission android:name="android.permission.DISABLE_KEYGUARD" />
+	<uses-permission android:name="android.permission.WAKE_LOCK" />
 
 	<!-- Allows for storing and retrieving screenshots -->
 	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 	<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
 
 	<!-- Allows changing locales -->
-	<uses-permission android:name="android.permission.CHANGE_CONFIGURATION" />
+	<uses-permission
+		android:name="android.permission.CHANGE_CONFIGURATION"
+		tools:ignore="ProtectedPermissions" />
 </manifest>
diff --git a/briar-android/src/test/java/org/briarproject/briar/android/account/SetPasswordFragmentTest.java b/briar-android/src/test/java/org/briarproject/briar/android/account/SetPasswordFragmentTest.java
deleted file mode 100644
index 56ad9e4a6..000000000
--- a/briar-android/src/test/java/org/briarproject/briar/android/account/SetPasswordFragmentTest.java
+++ /dev/null
@@ -1,118 +0,0 @@
-package org.briarproject.briar.android.account;
-
-import android.support.design.widget.TextInputLayout;
-import android.view.View;
-import android.widget.Button;
-import android.widget.EditText;
-
-import org.briarproject.briar.R;
-import org.briarproject.briar.android.TestBriarApplication;
-import org.briarproject.briar.android.account.SetPasswordFragment;
-import org.briarproject.briar.android.account.SetupActivity;
-import org.briarproject.briar.android.account.SetupController;
-import org.briarproject.briar.android.login.StrengthMeter;
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.mockito.Mock;
-import org.mockito.MockitoAnnotations;
-import org.robolectric.RobolectricTestRunner;
-import org.robolectric.annotation.Config;
-
-import static junit.framework.Assert.assertEquals;
-import static org.briarproject.bramble.api.crypto.PasswordStrengthEstimator.NONE;
-import static org.briarproject.bramble.api.crypto.PasswordStrengthEstimator.QUITE_STRONG;
-import static org.briarproject.bramble.api.crypto.PasswordStrengthEstimator.QUITE_WEAK;
-import static org.briarproject.bramble.api.crypto.PasswordStrengthEstimator.STRONG;
-import static org.briarproject.bramble.api.crypto.PasswordStrengthEstimator.WEAK;
-import static org.junit.Assert.assertNotEquals;
-import static org.mockito.Mockito.times;
-import static org.mockito.Mockito.verify;
-import static org.mockito.Mockito.when;
-import static org.robolectric.shadows.support.v4.SupportFragmentTestUtil.startFragment;
-
-@RunWith(RobolectricTestRunner.class)
-@Config(sdk = 21, application = TestBriarApplication.class)
-public class SetPasswordFragmentTest {
-
-	private SetPasswordFragment passwordFragment = new SetPasswordFragment();
-	private EditText passwordEntry;
-	private EditText passwordConfirmation;
-	private TextInputLayout passwordConfirmationWrapper;
-	private StrengthMeter strengthMeter;
-	private Button createAccountButton;
-
-	@Mock
-	private SetupController setupController;
-
-	@Before
-	public void setUp() {
-		MockitoAnnotations.initMocks(this);
-		startFragment(passwordFragment, SetupActivity.class);
-
-		View v = passwordFragment.getView();
-		passwordEntry = v.findViewById(R.id.password_entry);
-		passwordConfirmation = v.findViewById(R.id.password_confirm);
-		passwordConfirmationWrapper =
-				v.findViewById(R.id.password_confirm_wrapper);
-		strengthMeter = v.findViewById(R.id.strength_meter);
-		createAccountButton = v.findViewById(R.id.next);
-	}
-
-	@Test
-	public void testCreateAccountUI() {
-		String safePass = "really.safe.password";
-
-		passwordFragment.setupController = setupController;
-		when(setupController.needToShowDozeFragment()).thenReturn(false);
-		when(setupController.estimatePasswordStrength(safePass))
-				.thenReturn(STRONG);
-
-		passwordEntry.setText(safePass);
-		passwordConfirmation.setText(safePass);
-		// Confirm that the create account button is clickable
-		assertEquals(createAccountButton.isEnabled(), true);
-		createAccountButton.performClick();
-
-		// assert controller has been called properly
-		verify(setupController, times(1)).setPassword(safePass);
-		verify(setupController, times(1)).createAccount();
-	}
-
-	@Test
-	public void testStrengthMeterUI() {
-		// Test the meters' progress and color for several values
-		testStrengthMeter("1234567890ab", STRONG, StrengthMeter.GREEN);
-		testStrengthMeter("123456789", QUITE_STRONG, StrengthMeter.LIME);
-		testStrengthMeter("123456", QUITE_WEAK, StrengthMeter.YELLOW);
-		testStrengthMeter("123", WEAK, StrengthMeter.ORANGE);
-		testStrengthMeter("", NONE, StrengthMeter.RED);
-	}
-
-	private void testStrengthMeter(String pass, float strength, int color) {
-		passwordEntry.setText(pass);
-		assertEquals(strengthMeter.getProgress(),
-				(int) (strengthMeter.getMax() * strength));
-		assertEquals(color, strengthMeter.getColor());
-	}
-
-
-	@Test
-	public void testPasswordMatchUI() {
-		// Password mismatch
-		passwordEntry.setText("really.safe.password");
-		passwordConfirmation.setText("really.safe.pass");
-		assertEquals(createAccountButton.isEnabled(), false);
-		assertEquals(passwordConfirmationWrapper.getError(),
-				passwordFragment.getString(R.string.passwords_do_not_match));
-		// Button enabled
-		passwordEntry.setText("really.safe.pass");
-		passwordConfirmation.setText("really.safe.pass");
-		// Confirm that the password mismatch error message is not visible
-		assertNotEquals(passwordConfirmationWrapper.getError(),
-				passwordFragment.getString(R.string.passwords_do_not_match));
-		// Passwords match, so button should be enabled
-		assertEquals(createAccountButton.isEnabled(), true);
-	}
-
-}
diff --git a/briar-android/src/test/java/org/briarproject/briar/android/account/SetupActivityTest.java b/briar-android/src/test/java/org/briarproject/briar/android/account/SetupActivityTest.java
index aa45b6fa0..9edfd6f3d 100644
--- a/briar-android/src/test/java/org/briarproject/briar/android/account/SetupActivityTest.java
+++ b/briar-android/src/test/java/org/briarproject/briar/android/account/SetupActivityTest.java
@@ -1,48 +1,147 @@
 package org.briarproject.briar.android.account;
 
-import android.support.design.widget.TextInputLayout;
-import android.widget.EditText;
+import android.view.View;
 
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.TestBriarApplication;
-import org.briarproject.briar.android.account.SetupActivity;
-import org.junit.Assert;
-import org.junit.Before;
+import org.briarproject.briar.android.login.StrengthMeter;
+import org.hamcrest.Description;
+import org.hamcrest.Matcher;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
-import org.mockito.MockitoAnnotations;
-import org.robolectric.Robolectric;
-import org.robolectric.RobolectricTestRunner;
 import org.robolectric.annotation.Config;
 
-import static junit.framework.Assert.assertEquals;
+import androidx.test.espresso.matcher.BoundedMatcher;
+import androidx.test.ext.junit.rules.ActivityScenarioRule;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import static androidx.test.espresso.Espresso.onView;
+import static androidx.test.espresso.action.ViewActions.clearText;
+import static androidx.test.espresso.action.ViewActions.click;
+import static androidx.test.espresso.action.ViewActions.replaceText;
+import static androidx.test.espresso.action.ViewActions.typeText;
+import static androidx.test.espresso.assertion.ViewAssertions.doesNotExist;
+import static androidx.test.espresso.assertion.ViewAssertions.matches;
+import static androidx.test.espresso.matcher.ViewMatchers.isDisplayed;
+import static androidx.test.espresso.matcher.ViewMatchers.isEnabled;
+import static androidx.test.espresso.matcher.ViewMatchers.withId;
+import static androidx.test.espresso.matcher.ViewMatchers.withText;
+import static org.briarproject.bramble.api.crypto.PasswordStrengthEstimator.NONE;
+import static org.briarproject.bramble.api.crypto.PasswordStrengthEstimator.QUITE_STRONG;
+import static org.briarproject.bramble.api.crypto.PasswordStrengthEstimator.QUITE_WEAK;
+import static org.briarproject.bramble.api.crypto.PasswordStrengthEstimator.STRONG;
+import static org.briarproject.bramble.api.crypto.PasswordStrengthEstimator.WEAK;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_AUTHOR_NAME_LENGTH;
 import static org.briarproject.bramble.util.StringUtils.getRandomString;
+import static org.briarproject.briar.android.login.StrengthMeter.GREEN;
+import static org.briarproject.briar.android.login.StrengthMeter.LIME;
+import static org.briarproject.briar.android.login.StrengthMeter.ORANGE;
+import static org.briarproject.briar.android.login.StrengthMeter.RED;
+import static org.briarproject.briar.android.login.StrengthMeter.YELLOW;
+import static org.hamcrest.Matchers.not;
 
-@RunWith(RobolectricTestRunner.class)
+@RunWith(AndroidJUnit4.class)
 @Config(sdk = 21, application = TestBriarApplication.class)
 public class SetupActivityTest {
 
-	private SetupActivity setupActivity;
-	private TextInputLayout nicknameEntryWrapper;
-	private EditText nicknameEntry;
+	@Rule
+	public ActivityScenarioRule<SetupActivity> rule =
+			new ActivityScenarioRule<>(SetupActivity.class);
 
-	@Before
-	public void setUp() {
-		MockitoAnnotations.initMocks(this);
-		setupActivity = Robolectric.setupActivity(SetupActivity.class);
-		nicknameEntryWrapper =
-				setupActivity.findViewById(R.id.nickname_entry_wrapper);
-		nicknameEntry = setupActivity.findViewById(R.id.nickname_entry);
+	@Test
+	public void testNicknameTooLongErrorShown() {
+		String longNick = getRandomString(MAX_AUTHOR_NAME_LENGTH + 1);
+		onView(withId(R.id.nickname_entry)).perform(typeText(longNick));
+
+		// Nickname should be too long
+		onView(withText(R.string.name_too_long)).check(matches(isDisplayed()));
 	}
 
 	@Test
-	public void testNicknameUI() {
-		Assert.assertNotNull(setupActivity);
-		String longNick = getRandomString(MAX_AUTHOR_NAME_LENGTH + 1);
-		nicknameEntry.setText(longNick);
-		// Nickname should be too long
-		assertEquals(nicknameEntryWrapper.getError(),
-				setupActivity.getString(R.string.name_too_long));
+	public void testPasswordMatchUI() {
+		moveToSetPasswordFragment();
+
+		// error shown when passwords don't match, button is disabled
+		onView(withId(R.id.password_entry)).perform(typeText("123456"));
+		onView(withId(R.id.password_confirm)).perform(typeText("654321"));
+		onView(withText(R.string.passwords_do_not_match))
+				.check(matches(isDisplayed()));
+		onView(withId(R.id.next)).check(matches(not(isEnabled())));
+
+		// confirming correct password, removes error, enables button
+		onView(withId(R.id.password_confirm)).perform(clearText());
+		onView(withId(R.id.password_confirm)).perform(replaceText("123456"));
+		onView(withText(R.string.passwords_do_not_match)).check(doesNotExist());
+		onView(withId(R.id.next)).check(matches(isEnabled()));
+
+		// clicking the button shows progress bar, no doze because SDK_INT==21
+		onView(withId(R.id.next)).perform(click());
+		onView(withId(R.id.progress)).check(matches(isDisplayed()));
 	}
+
+	@Test
+	public void testStrengthMeterUI() {
+		moveToSetPasswordFragment();
+
+		onView(withId(R.id.password_entry)).perform(typeText("1234567890ab"));
+		onView(withId(R.id.strength_meter))
+				.check(matches(strengthAndColor(STRONG, GREEN)));
+
+		onView(withId(R.id.password_entry)).perform(clearText());
+		onView(withId(R.id.password_entry)).perform(typeText("123456789"));
+		onView(withId(R.id.strength_meter))
+				.check(matches(strengthAndColor(QUITE_STRONG, LIME)));
+
+		onView(withId(R.id.password_entry)).perform(clearText());
+		onView(withId(R.id.password_entry)).perform(typeText("123456"));
+		onView(withId(R.id.strength_meter))
+				.check(matches(strengthAndColor(QUITE_WEAK, YELLOW)));
+
+		onView(withId(R.id.password_entry)).perform(clearText());
+		onView(withId(R.id.password_entry)).perform(typeText("123"));
+		onView(withId(R.id.strength_meter))
+				.check(matches(strengthAndColor(WEAK, ORANGE)));
+
+		onView(withId(R.id.password_entry)).perform(clearText());
+		onView(withId(R.id.strength_meter))
+				.check(matches(strengthAndColor(NONE, RED)));
+	}
+
+	private void moveToSetPasswordFragment() {
+		onView(withId(R.id.nickname_entry)).perform(typeText("test"));
+		onView(withId(R.id.next)).perform(click());
+		onView(withId(R.id.password_entry)).check(matches(isDisplayed()));
+	}
+
+	private Matcher<View> strengthAndColor(float strength, int color) {
+		return new StrengthMeterMatcher(strength, color);
+	}
+
+	static class StrengthMeterMatcher
+			extends BoundedMatcher<View, StrengthMeter> {
+
+		private final float strength;
+		private final int color;
+
+		private StrengthMeterMatcher(float strength, int color) {
+			super(StrengthMeter.class);
+			this.strength = strength;
+			this.color = color;
+		}
+
+		@Override
+		public void describeTo(Description description) {
+			description.appendText("is enabled");
+		}
+
+		@Override
+		public boolean matchesSafely(StrengthMeter view) {
+			boolean strengthMatches =
+					view.getProgress() == (int) (view.getMax() * strength);
+			boolean colorMatches = color == view.getColor();
+			return strengthMatches && colorMatches;
+		}
+	}
+
 }
diff --git a/briar-android/src/test/java/org/briarproject/briar/android/login/ChangePasswordActivityTest.java b/briar-android/src/test/java/org/briarproject/briar/android/login/ChangePasswordActivityTest.java
index 811834c4d..27945abd6 100644
--- a/briar-android/src/test/java/org/briarproject/briar/android/login/ChangePasswordActivityTest.java
+++ b/briar-android/src/test/java/org/briarproject/briar/android/login/ChangePasswordActivityTest.java
@@ -1,9 +1,10 @@
 package org.briarproject.briar.android.login;
 
-import android.support.design.widget.TextInputLayout;
 import android.widget.Button;
 import android.widget.EditText;
 
+import com.google.android.material.textfield.TextInputLayout;
+
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.TestBriarApplication;
 import org.briarproject.briar.android.controller.handler.ResultHandler;
diff --git a/briar-android/witness.gradle b/briar-android/witness.gradle
index 08159b2d3..5569b2788 100644
--- a/briar-android/witness.gradle
+++ b/briar-android/witness.gradle
@@ -1,109 +1,115 @@
 dependencyVerification {
     verify = [
-        'android.arch.core:common:1.1.1:common-1.1.1.jar:3a616a32f433e9e23f556b38575c31b013613d3ae85206263b7625fe1f4c151a',
-        'android.arch.core:runtime:1.1.1:runtime-1.1.1.aar:c3215aa5873311b3f88a6f4e4a3c25ad89971bc127de8c3e1291c57f93a05c39',
-        'android.arch.lifecycle:common:1.1.1:common-1.1.1.jar:8d378e88ebd5189e09eef623414812c868fd90aa519d6160e2311fb8b81cff56',
-        'android.arch.lifecycle:extensions:1.1.1:extensions-1.1.1.aar:429426b2feec2245ffc5e75b3b5309bedb36159cf06dc71843ae43526ac289b6',
-        'android.arch.lifecycle:livedata-core:1.1.1:livedata-core-1.1.1.aar:d6fdd8b985d6178d7ea2f16986a24e83f1bee936b74d43167c69e08d3cc12c50',
-        'android.arch.lifecycle:livedata:1.1.1:livedata-1.1.1.aar:50ab0490c1ff1a7cfb4e554032998b080888946d0dd424f39900efc4a1bcd750',
-        'android.arch.lifecycle:runtime:1.1.1:runtime-1.1.1.aar:c4e4be66c1b2f0abec593571454e1de14013f7e0f96bf2a9f212931a48cae550',
-        'android.arch.lifecycle:viewmodel:1.1.1:viewmodel-1.1.1.aar:7de29cfaba77d6b5d5be234c57f6812d0150d087e63941af22ba1d1f8e2bc96a',
-        'androidx.annotation:annotation:1.0.0:annotation-1.0.0.jar:0baae9755f7caf52aa80cd04324b91ba93af55d4d1d17dcc9a7b53d99ef7c016',
-        'androidx.test:monitor:1.1.0:monitor-1.1.0.aar:0f08c6e9272b2647101af5da6d9bcea1f212db2adf2846efb2ef6a86a3ad0448',
+        'androidx.activity:activity-ktx:1.0.0:activity-ktx-1.0.0.aar:be4d4c7e51a42fedb0bc6e68e9c3eba3603d3bbc2ef468689694369f98eab6c7',
+        'androidx.activity:activity:1.0.0:activity-1.0.0.aar:d1bc9842455c2e534415d88c44df4d52413b478db9093a1ba36324f705f44c3d',
+        'androidx.annotation:annotation:1.1.0:annotation-1.1.0.jar:d38d63edb30f1467818d50aaf05f8a692dea8b31392a049bfa991b159ad5b692',
+        'androidx.appcompat:appcompat-resources:1.1.0:appcompat-resources-1.1.0.aar:19944d32b46551a17c347e21894b95837fbd7baaafc9e2082794344f222f7361',
+        'androidx.appcompat:appcompat:1.1.0:appcompat-1.1.0.aar:8d7299bca44cb3bdf17f5595766acbf459fc81fee223e8686cc6acd3a42ab5c0',
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+        'com.android.tools.analytics-library:tracker:26.5.1:tracker-26.5.1.jar:3a76984c0fe2e847ca7a8b35b4780ef0447a9d1666946cb8e60466318e0ab5ae',
+        'com.android.tools.build:aapt2-proto:0.4.0:aapt2-proto-0.4.0.jar:fac0435e08898f89eeeb9ca236bea707155ff816c12205ced285ad53604133ca',
+        'com.android.tools.build:apksig:3.5.1:apksig-3.5.1.jar:1fd33e7f009a2a0da766cfeec4211a09f548034b015c289a66d75dd8a9302f4a',
+        'com.android.tools.build:apkzlib:3.5.1:apkzlib-3.5.1.jar:9f330167cbe973b7db407692f74f4f6453b7ffa5f2048934b06280c2ceee60fa',
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+        'com.android.tools.build:gradle-api:3.5.1:gradle-api-3.5.1.jar:be9b41859bace11998f66b04ed944f87e413f3ad6da3c4665587699da125addc',
+        'com.android.tools.build:manifest-merger:26.5.1:manifest-merger-26.5.1.jar:dcad9ecb967251f4d750f55a4204a2b400e8fbfe5cb930a1d0d5dbe10ae8bdfc',
+        'com.android.tools.ddms:ddmlib:26.5.1:ddmlib-26.5.1.jar:b081aef2a4ed3f4d47cae4cdb128469735f25a114e026d37123bf9ffdec742a8',
+        'com.android.tools.external.com-intellij:intellij-core:26.5.1:intellij-core-26.5.1.jar:20eced30adc124805bd93488d9cd9d3e33e6bf7b48e9fe5a703d4983f894d450',
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+        'com.android.tools.external.org-jetbrains:uast:26.5.1:uast-26.5.1.jar:4bc8653d6c0943f40fee963a149e36c6baa45683d2530968a13f5007e3c40740',
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+        'com.android.tools.lint:lint-api:26.5.1:lint-api-26.5.1.jar:ec33fcd72bfaf70dd841e03fbfd93f109c2e575aec146067c606689c3972f0de',
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+        'com.android.tools.lint:lint-gradle-api:26.5.1:lint-gradle-api-26.5.1.jar:82453fd98a8394cc84ed995c04d2cd744abd1d6589403427ba7eef53115406f3',
+        'com.android.tools.lint:lint-gradle:26.5.1:lint-gradle-26.5.1.jar:59465b56cf7db77c656d5f8195d721c3d48b6bdd0502d774de335bfe4baff00b',
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+        'com.android.tools:annotations:26.5.1:annotations-26.5.1.jar:2c43c82f8c59d8f7a61e3239e1a2dc9f69dc342ec09af9b7c9f69b25337c0b6e',
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+        'com.android.tools:dvlib:26.5.1:dvlib-26.5.1.jar:46f93ad498b4756e7d867d2fe38c38890a80e7407a4ae459e4a8c8d5c5aeacfe',
+        'com.android.tools:repository:26.5.1:repository-26.5.1.jar:2b3ee791aa4c3e8ce60498c161a27ca7228816fc630eed4d9f25f2f36a106dce',
+        'com.android.tools:sdk-common:26.5.1:sdk-common-26.5.1.jar:365f749676c3574676fd465177c8a492f340816db2b520d6ed114d3b6e77bea7',
+        'com.android.tools:sdklib:26.5.1:sdklib-26.5.1.jar:007da104afb27c8c682a1628023fe9ec438249c8d15ef0fd6624c5bb8e23b696',
+        'com.github.bumptech.glide:annotations:4.10.0:annotations-4.10.0.jar:9cdc56335efeffe5b7ea5f7c98555451c6ea3c79c2f95f8e4ce2d4f76de226f8',
+        'com.github.bumptech.glide:compiler:4.10.0:compiler-4.10.0.jar:25083f3be077a890e7dda638a57d1a231842c794051f2c9705b857895d588e6d',
+        'com.github.bumptech.glide:gifdecoder:4.10.0:gifdecoder-4.10.0.aar:197a1cd5b76855aa02b230c13974e293229b901dc2b96fab4315201e78baa804',
+        'com.github.bumptech.glide:glide:4.10.0:glide-4.10.0.aar:07471967af4c290699feadb587c15671d31aebd95987f9b0b24210abfff1681e',
+        'com.github.chrisbanes:PhotoView:2.3.0:PhotoView-2.3.0.aar:6c8989f2945d50ab38b3e0300064f1f8d2d75bbcae1434fe535d9fb6898e9ad6',
         'com.github.kobakei:MaterialFabSpeedDial:1.2.1:MaterialFabSpeedDial-1.2.1.aar:e86198c3c48cd832fb209a769a9f222c2a3cc045743b110ac2391d9737e3ea02',
         'com.google.android.apps.common.testing.accessibility.framework:accessibility-test-framework:2.0:accessibility-test-framework-2.0.jar:cdf16ef8f5b8023d003ce3cc1b0d51bda737762e2dab2fedf43d1c4292353f7f',
         'com.google.android.apps.common.testing.accessibility.framework:accessibility-test-framework:2.1:accessibility-test-framework-2.1.jar:7b0aa6ed7553597ce0610684a9f7eca8021eee218f2e2f427c04a7fbf5f920bd',
-        'com.google.code.findbugs:jsr305:1.3.9:jsr305-1.3.9.jar:905721a0eea90a81534abb7ee6ef4ea2e5e645fa1def0a5cd88402df1b46c9ed',
+        'com.google.android.material:material:1.1.0-beta01:material-1.1.0-beta01.aar:b6f2ef164bf40c04667d9cfe05ae66b81f9b839910a5ca84e5b0ee1608b0a5ad',
+        'com.google.auto.service:auto-service:1.0-rc4:auto-service-1.0-rc4.jar:e422d49c312fd2031222e7306e8108c1b4118eb9c049f1b51eca280bed87e924',
+        'com.google.auto:auto-common:0.8:auto-common-0.8.jar:97db1709f57b91b32edacb596ef4641872f227b7d99ad90e467f0d77f5ba134a',
         'com.google.code.findbugs:jsr305:3.0.2:jsr305-3.0.2.jar:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
-        'com.google.code.gson:gson:2.8.0:gson-2.8.0.jar:c6221763bd79c4f1c3dc7f750b5f29a0bb38b367b81314c4f71896e340c40825',
-        'com.google.dagger:dagger-compiler:2.22.1:dagger-compiler-2.22.1.jar:e5f28302cbe70a79d3620cddebfb8ec0736814f3980ffe1e673bfe3342f507d3',
-        'com.google.dagger:dagger-producers:2.22.1:dagger-producers-2.22.1.jar:f834a0082014213a68ff06a0f048d750178d02196c58b0b15beb367d32b97e35',
-        'com.google.dagger:dagger-spi:2.22.1:dagger-spi-2.22.1.jar:4b0b922793b3bcb91b99fabb75dba77c68afd7ae4c5f0c4fd6ba681f0a291c7d',
-        'com.google.dagger:dagger:2.22.1:dagger-2.22.1.jar:329d4340f24c4f5717af016c097e90668bfea2a5376e6aa9964b01cef3fd241a',
-        'com.google.errorprone:error_prone_annotations:2.1.3:error_prone_annotations-2.1.3.jar:03d0329547c13da9e17c634d1049ea2ead093925e290567e1a364fd6b1fc7ff8',
+        'com.google.code.gson:gson:2.8.5:gson-2.8.5.jar:233a0149fc365c9f6edbd683cfe266b19bdc773be98eabdaf6b3c924b48e7d81',
+        'com.google.dagger:dagger-compiler:2.24:dagger-compiler-2.24.jar:3c5afb955fb188da485cb2c048eff37dce0e1530b9780a0f2f7187d16d1ccc1f',
+        'com.google.dagger:dagger-producers:2.24:dagger-producers-2.24.jar:f10f45b95191954d5d6b043fca9e62fb621d21bf70634b8f8476c7988b504c3a',
+        'com.google.dagger:dagger-spi:2.24:dagger-spi-2.24.jar:c038445d14dbcb4054e61bf49e05009edf26fce4fdc7ec1a9db544784f68e718',
+        'com.google.dagger:dagger:2.24:dagger-2.24.jar:550a6e46a6dfcdf1d764887b6090cea94f783327e50e5c73754f18facfc70b64',
+        'com.google.errorprone:error_prone_annotations:2.2.0:error_prone_annotations-2.2.0.jar:6ebd22ca1b9d8ec06d41de8d64e0596981d9607b42035f9ed374f9de271a481a',
         'com.google.errorprone:javac-shaded:9-dev-r4023-3:javac-shaded-9-dev-r4023-3.jar:65bfccf60986c47fbc17c9ebab0be626afc41741e0a6ec7109e0768817a36f30',
         'com.google.googlejavaformat:google-java-format:1.5:google-java-format-1.5.jar:aa19ad7850fb85178aa22f2fddb163b84d6ce4d0035872f30d4408195ca1144e',
-        'com.google.guava:guava:20.0:guava-20.0.jar:36a666e3b71ae7f0f0dca23654b67e086e6c93d192f60ba5dfd5519db6c288c8',
-        'com.google.guava:guava:25.0-jre:guava-25.0-jre.jar:3fd4341776428c7e0e5c18a7c10de129475b69ab9d30aeafbb5c277bb6074fa9',
-        'com.google.guava:guava:26.0-jre:guava-26.0-jre.jar:a0e9cabad665bc20bcd2b01f108e5fc03f756e13aea80abaadb9f407033bea2c',
+        'com.google.guava:failureaccess:1.0.1:failureaccess-1.0.1.jar:a171ee4c734dd2da837e4b16be9df4661afab72a41adaf31eb84dfdaf936ca26',
+        'com.google.guava:guava:27.0.1-jre:guava-27.0.1-jre.jar:e1c814fd04492a27c38e0317eabeaa1b3e950ec8010239e400fe90ad6c9107b4',
+        'com.google.guava:guava:27.1-jre:guava-27.1-jre.jar:4a5aa70cc968a4d137e599ad37553e5cfeed2265e8c193476d7119036c536fe7',
+        'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava:listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar:b372a037d4230aa57fbeffdef30fd6123f9c0c2db85d0aced00c91b974f33f99',
         'com.google.j2objc:j2objc-annotations:1.1:j2objc-annotations-1.1.jar:2994a7eb78f2710bd3d3bfb639b2c94e219cedac0d4d084d516e78c16dddecf6',
         'com.google.jimfs:jimfs:1.1:jimfs-1.1.jar:c4828e28d7c0a930af9387510b3bada7daa5c04d7c25a75c7b8b081f1c257ddd',
         'com.google.protobuf:protobuf-java:2.6.1:protobuf-java-2.6.1.jar:55aa554843983f431df5616112cf688d38aa17c132357afd1c109435bfdac4e6',
@@ -122,18 +128,20 @@ dependencyVerification {
         'com.vanniktech:emoji:0.6.0:emoji-0.6.0.aar:a5fcde58902305c004f03c6dc2241e718400ac4162226079791d87fac83ef639',
         'commons-codec:commons-codec:1.10:commons-codec-1.10.jar:4241dfa94e711d435f29a4604a3e2de5c4aa3c165e23bd066be6fc1fc4309569',
         'commons-logging:commons-logging:1.2:commons-logging-1.2.jar:daddea1ea0be0f56978ab3006b8ac92834afeefbd9b7e4e6316fca57df0fa636',
-        'de.hdodenhof:circleimageview:2.2.0:circleimageview-2.2.0.aar:bc34761dcd5036229ac1ffed6b5b1bef722ad5b097a2c8bba1c5ed2cd4b5c82b',
-        'info.guardianproject.panic:panic:0.5:panic-0.5.jar:a7ed9439826db2e9901649892cf9afbe76f00991b768d8f4c26332d7c9406cb2',
+        'de.hdodenhof:circleimageview:3.0.1:circleimageview-3.0.1.aar:7b0f088436ad4dcbb36d779fd09bf2192d9cc1e1a734bb6337904a7648f97617',
+        'info.guardianproject.panic:panic:1.0:panic-1.0.jar:35116ab95212e67f94577faf67b88c11a6b21cbf9178b3f5b51d3dff45203ffd',
         'info.guardianproject.trustedintents:trustedintents:0.2:trustedintents-0.2.jar:6221456d8821a8d974c2acf86306900237cf6afaaa94a4c9c44e161350f80f3e',
         'it.unimi.dsi:fastutil:7.2.0:fastutil-7.2.0.jar:74fa208043740642f7e6eb09faba15965218ad2f50ce3020efb100136e4b591c',
+        'javax.annotation:javax.annotation-api:1.3.2:javax.annotation-api-1.3.2.jar:e04ba5195bcd555dc95650f7cc614d151e4bcd52d29a10b8aa2197f3ab89ab9b',
         'javax.annotation:jsr250-api:1.0:jsr250-api-1.0.jar:a1a922d0d9b6d183ed3800dfac01d1e1eb159f0e8c6f94736931c1def54a941f',
         'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
         'javax.xml.bind:jaxb-api:2.2.12-b140109.1041:jaxb-api-2.2.12-b140109.1041.jar:b5e60cd8b7b5ff01ce4a74c5dd008f4fbd14ced3495d0b47b85cfedc182211f2',
         'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
         'nekohtml:nekohtml:1.9.6.2:nekohtml-1.9.6.2.jar:fdff6cfa9ed9cc911c842a5d2395f209ec621ef1239d46810e9e495809d3ae09',
         'nekohtml:xercesMinimal:1.9.6.2:xercesMinimal-1.9.6.2.jar:95b8b357d19f63797dd7d67622fd3f18374d64acbc6584faba1c7759a31e8438',
-        'net.bytebuddy:byte-buddy-agent:1.9.7:byte-buddy-agent-1.9.7.jar:145ce0fab5390374e69b2b4070d65fedaa2b07c3cfad06b330bea1b6dcfa826f',
-        'net.bytebuddy:byte-buddy:1.9.7:byte-buddy-1.9.7.jar:69a9140c11de463789a1badfe6c3dcdc17608c4304cb443c5c3a179585b78b39',
+        'net.bytebuddy:byte-buddy-agent:1.9.10:byte-buddy-agent-1.9.10.jar:8ed739d29132103250d307d2e8e3c95f07588ef0543ab11d2881d00768a5e182',
+        'net.bytebuddy:byte-buddy:1.9.10:byte-buddy-1.9.10.jar:2936debc4d7b6c534848d361412e2d0f8bd06f7f27a6f4e728a20e97648d2bf3',
+        'net.ltgt.gradle.incap:incap:0.2:incap-0.2.jar:b625b9806b0f1e4bc7a2e3457119488de3cd57ea20feedd513db070a573a4ffd',
         'net.sf.jopt-simple:jopt-simple:4.9:jopt-simple-4.9.jar:26c5856e954b5f864db76f13b86919b59c6eecf9fd930b96baa8884626baf2f5',
         'net.sf.kxml:kxml2:2.3.0:kxml2-2.3.0.jar:f264dd9f79a1fde10ce5ecc53221eff24be4c9331c830b7d52f2f08a7b633de2',
         'org.apache.ant:ant-launcher:1.9.4:ant-launcher-1.9.4.jar:7bccea20b41801ca17bcbc909a78c835d0f443f12d639c77bd6ae3d05861608d',
@@ -163,7 +171,7 @@ dependencyVerification {
         'org.checkerframework:checker-compat-qual:2.5.3:checker-compat-qual-2.5.3.jar:d76b9afea61c7c082908023f0cbc1427fab9abd2df915c8b8a3e7a509bccbc6d',
         'org.checkerframework:checker-qual:2.5.2:checker-qual-2.5.2.jar:64b02691c8b9d4e7700f8ee2e742dce7ea2c6e81e662b7522c9ee3bf568c040a',
         'org.codehaus.groovy:groovy-all:2.4.15:groovy-all-2.4.15.jar:51d6c4e71782e85674239189499854359d380fb75e1a703756e3aaa5b98a5af0',
-        'org.codehaus.mojo:animal-sniffer-annotations:1.14:animal-sniffer-annotations-1.14.jar:2068320bd6bad744c3673ab048f67e30bef8f518996fa380033556600669905d',
+        'org.codehaus.mojo:animal-sniffer-annotations:1.17:animal-sniffer-annotations-1.17.jar:92654f493ecfec52082e76354f0ebf87648dc3d5cec2e3c3cdb947c016747a53',
         'org.codehaus.plexus:plexus-container-default:1.0-alpha-9-stable-1:plexus-container-default-1.0-alpha-9-stable-1.jar:7c758612888782ccfe376823aee7cdcc7e0cdafb097f7ef50295a0b0c3a16edf',
         'org.codehaus.plexus:plexus-interpolation:1.11:plexus-interpolation-1.11.jar:fd9507feb858fa620d1b4aa4b7039fdea1a77e09d3fd28cfbddfff468d9d8c28',
         'org.codehaus.plexus:plexus-utils:1.5.15:plexus-utils-1.5.15.jar:2ca121831e597b4d8f2cb22d17c5c041fc23a7777ceb6bfbdd4dfb34bbe7d997',
@@ -173,11 +181,16 @@ dependencyVerification {
         'org.hamcrest:hamcrest-core:1.3:hamcrest-core-1.3.jar:66fdef91e9739348df7a096aa384a5685f4e875584cce89386a7a47251c4d8e9',
         'org.hamcrest:hamcrest-integration:1.3:hamcrest-integration-1.3.jar:70f418efbb506c5155da5f9a5a33262ea08a9e4d7fea186aa9015c41a7224ac2',
         'org.hamcrest:hamcrest-library:1.3:hamcrest-library-1.3.jar:711d64522f9ec410983bd310934296da134be4254a125080a0416ec178dfad1c',
-        'org.jetbrains.kotlin:kotlin-reflect:1.3.21:kotlin-reflect-1.3.21.jar:a3065c822633191e0a3e3ee12a29bec234fc4b2864a6bb87ef48cce3e9e0c26a',
-        'org.jetbrains.kotlin:kotlin-stdlib-common:1.3.21:kotlin-stdlib-common-1.3.21.jar:cea61f7b611895e64f58569a9757fc0ab0d582f107211e1930e0ce2a0add52a7',
-        'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.21:kotlin-stdlib-jdk7-1.3.21.jar:a87875604fd42140da6938ae4d35ee61081f4482536efc6d2615b8b626a198af',
-        'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.21:kotlin-stdlib-jdk8-1.3.21.jar:5823ed66ac122a1c55442ebca5a209a843ccd87f562edc31a787f3d2e47f74d4',
-        'org.jetbrains.kotlin:kotlin-stdlib:1.3.21:kotlin-stdlib-1.3.21.jar:38ba2370d9f06f50433e06b2ca775b94473c2e2785f410926079ab793c72b034',
+        'org.jetbrains.kotlin:kotlin-reflect:1.3.50:kotlin-reflect-1.3.50.jar:64583199ea5a54aefd1bd1595288925f784226ee562d1dd279011c6075b3d7a4',
+        'org.jetbrains.kotlin:kotlin-stdlib-common:1.3.31:kotlin-stdlib-common-1.3.31.jar:d6e9c54c1e6c4df21be9395de558665544c6bdc8f8076ea7518f089f82cd34fc',
+        'org.jetbrains.kotlin:kotlin-stdlib-common:1.3.50:kotlin-stdlib-common-1.3.50.jar:8ce678e88e4ba018b66dacecf952471e4d7dfee156a8a819760a5a5ff29d323c',
+        'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.50:kotlin-stdlib-jdk7-1.3.50.jar:9a026639e76212f8d57b86d55b075394c2e009f1979110751d34c05c5f75d57b',
+        'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.50:kotlin-stdlib-jdk8-1.3.50.jar:1b351fb6e09c14b55525c74c1f4cf48942eae43c348b7bc764a5e6e423d4da0c',
+        'org.jetbrains.kotlin:kotlin-stdlib:1.3.31:kotlin-stdlib-1.3.31.jar:f38c84326543e66ed4895b20fb3ea0fca527fd5a040e1f49d0946ecf3d2b3b23',
+        'org.jetbrains.kotlin:kotlin-stdlib:1.3.50:kotlin-stdlib-1.3.50.jar:e6f05746ee0366d0b52825a090fac474dcf44082c9083bbb205bd16976488d6c',
+        'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.1.1:kotlinx-coroutines-android-1.1.1.jar:ed6fc7d667d5c11d187894789d7bf6cf8fedccb0be75fde795b8686582a1fe32',
+        'org.jetbrains.kotlinx:kotlinx-coroutines-core-common:1.1.1:kotlinx-coroutines-core-common-1.1.1.jar:033732168fd3a68a7d788294321106ae13536eae8459382a85cc1f17f88572e7',
+        'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.1.1:kotlinx-coroutines-core-1.1.1.jar:ac423f8a0aa4b4e74529696ff82c0171f81a8c8ab182a1965dff25e69c1f7844',
         'org.jetbrains.trove4j:trove4j:20160824:trove4j-20160824.jar:1917871c8deb468307a584680c87a44572f5a8b0b98c6d397fc0f5f86596dbe7',
         'org.jetbrains:annotations:13.0:annotations-13.0.jar:ace2a10dc8e2d5fd34925ecac03e4988b2c0f851650c94b8cef49ba1bd111478',
         'org.jmock:jmock-junit4:2.8.2:jmock-junit4-2.8.2.jar:f7ee4df4f7bd7b7f1cafad3b99eb74d579f109d5992ff625347352edb55e674c',
@@ -185,23 +198,30 @@ dependencyVerification {
         'org.jmock:jmock-testjar:2.8.2:jmock-testjar-2.8.2.jar:8900860f72c474e027cf97fe78dcbf154a1aa7fc62b6845c5fb4e4f3c7bc8760',
         'org.jmock:jmock:2.8.2:jmock-2.8.2.jar:6c73cb4a2e6dbfb61fd99c9a768539c170ab6568e57846bd60dbf19596b65b16',
         'org.jvnet.staxex:stax-ex:1.7.7:stax-ex-1.7.7.jar:a31ff7d77163c0deb09e7fee59ad35ae44c2cee2cc8552a116ccd1583d813fb4',
-        'org.mockito:mockito-core:2.25.0:mockito-core-2.25.0.jar:28028d70cc27d61442948fcb3d249d9df5b37c47aa0b82490a3d049094ff411f',
+        'org.mockito:mockito-core:3.1.0:mockito-core-3.1.0.jar:89b09e518e04f5c35f5ccf7abe45e72f594070a53d95cc2579001bd392c5afa6',
         'org.objenesis:objenesis:2.6:objenesis-2.6.jar:5e168368fbc250af3c79aa5fef0c3467a2d64e5a7bd74005f25d8399aeb0708d',
         'org.ow2.asm:asm-analysis:6.0:asm-analysis-6.0.jar:2f1a6387219c3a6cc4856481f221b03bd9f2408a326d416af09af5d6f608c1f4',
+        'org.ow2.asm:asm-analysis:7.0:asm-analysis-7.0.jar:e981f8f650c4d900bb033650b18e122fa6b161eadd5f88978d08751f72ee8474',
         'org.ow2.asm:asm-commons:6.0:asm-commons-6.0.jar:f1bce5c648a96a017bdcd01fe5d59af9845297fd7b79b81c015a6fbbd9719abf',
+        'org.ow2.asm:asm-commons:7.0:asm-commons-7.0.jar:fed348ef05958e3e846a3ac074a12af5f7936ef3d21ce44a62c4fa08a771927d',
         'org.ow2.asm:asm-tree:6.0:asm-tree-6.0.jar:887998fb69727c8759e4d253f856822801e33f9fd4caa566b3ac58ee92106215',
+        'org.ow2.asm:asm-tree:7.0:asm-tree-7.0.jar:cfd7a0874f9de36a999c127feeadfbfe6e04d4a71ee954d7af3d853f0be48a6c',
         'org.ow2.asm:asm-util:6.0:asm-util-6.0.jar:356afebdb0f870175262e5188f8709a3b17aa2a5a6a4b0340b04d4b449bca5f6',
+        'org.ow2.asm:asm-util:7.0:asm-util-7.0.jar:75fbbca440ef463f41c2b0ab1a80abe67e910ac486da60a7863cbcb5bae7e145',
         'org.ow2.asm:asm:6.0:asm-6.0.jar:dd8971c74a4e697899a8e95caae4ea8760ea6c486dc6b97b1795e75760420461',
-        'org.robolectric:annotations:4.0.1:annotations-4.0.1.jar:42a625e546f5269dcdab5e8929ea610785184f113a981a676e0dadb1cad5674b',
-        'org.robolectric:junit:4.0.1:junit-4.0.1.jar:e4d3a41daf245c65b525684eb01cdef8dca925c1e649d64685017ca37cc03f1c',
-        'org.robolectric:resources:4.0.1:resources-4.0.1.jar:26706b4752fb284b1258dc114af5a711d57f1ff99fbd849747827599ac51eb08',
-        'org.robolectric:robolectric:4.0.1:robolectric-4.0.1.jar:88742d3a968f8b277600414bf3f3fc291b4bc02c9c4599547915b806266b075a',
-        'org.robolectric:sandbox:4.0.1:sandbox-4.0.1.jar:f99979605a3061799bd83f51fe1de8bc49e70299aa56656374f3e6f4712558e7',
-        'org.robolectric:shadowapi:4.0.1:shadowapi-4.0.1.jar:ccb26b6024760149fb52e057827220c9a1b929ad9c8c3c07cfe6277d29a78bd2',
-        'org.robolectric:shadows-framework:4.0.1:shadows-framework-4.0.1.jar:b468a4d0b225e846f3d52c71fe9c3e2dda0b00ced9317a1ea205bb6d78ba1591',
-        'org.robolectric:shadows-support-v4:3.3.2:shadows-support-v4-3.3.2.jar:6f689264738266e70fe08db7c04b7b5a75155994f4e3f7f311960d90486bf005',
-        'org.robolectric:utils:4.0.1:utils-4.0.1.jar:ee923ed66847271009ebeb246286b7206b160c2b6d1347fe820c00be06c280cb',
+        'org.ow2.asm:asm:7.0:asm-7.0.jar:b88ef66468b3c978ad0c97fd6e90979e56155b4ac69089ba7a44e9aa7ffe9acf',
+        'org.robolectric:annotations:4.3.1:annotations-4.3.1.jar:ce679af70c22620b5752aa6c1555d0653198d6370e9a93fe71b8eaaebc5ffaf6',
+        'org.robolectric:junit:4.3.1:junit-4.3.1.jar:60c85ea7fd652bc4e57567cbd3c41c5d32f2c678e212b713cefa6c63570451ce',
+        'org.robolectric:pluginapi:4.3.1:pluginapi-4.3.1.jar:229256a260a1d8e8d33613a3de7ccd639661a7061251c1974975ed427428b468',
+        'org.robolectric:plugins-maven-dependency-resolver:4.3.1:plugins-maven-dependency-resolver-4.3.1.jar:0d6c577fdefe254659ffba5c0564d7e00c69f03e99a4ebb6c150419834cdb703',
+        'org.robolectric:resources:4.3.1:resources-4.3.1.jar:93033237006b51541f8e93d65940f9040367775937d0ce9ac3f4ef72771c51b8',
+        'org.robolectric:robolectric:4.3.1:robolectric-4.3.1.jar:3ef4267112ba581ee2a7ad37859bf61571404f07df85b8ad1da054f90eb57a5a',
+        'org.robolectric:sandbox:4.3.1:sandbox-4.3.1.jar:405f73400d717e083b25af92fa7866a76765dd4e97cf7fd046023d4f05375a9f',
+        'org.robolectric:shadowapi:4.3.1:shadowapi-4.3.1.jar:a63d13e7f3816f28ac33eea71a15c7f3f0053ecd01b08cc1e1e119af35ca1197',
+        'org.robolectric:shadows-framework:4.3.1:shadows-framework-4.3.1.jar:9c69db134cdd79be751856a148020fd9b32b086bb491846eedc0a1106fcadd5e',
+        'org.robolectric:utils-reflector:4.3.1:utils-reflector-4.3.1.jar:9d7bf2557947d44d6f3ed76ec5231e8b72e33eb61c65ac9e149ad307b0eb936c',
+        'org.robolectric:utils:4.3.1:utils-4.3.1.jar:6f9e406cd667019a5450e473c4e2d372bff9c9ab6ef55aafcbc9843109cb1519',
         'tools.fastlane:screengrab:1.2.0:screengrab-1.2.0.aar:af4ee23bb06f94404d3ab18e2ea69db8265539fc8da29f9ee45b7e472684ba83',
-        'uk.co.samuelwall:material-tap-target-prompt:2.14.0:material-tap-target-prompt-2.14.0.aar:12ab447ba97019adbecb20e048921ca30ed7a9f72a37b83f39a4333bd759b518',
+        'uk.co.samuelwall:material-tap-target-prompt:3.0.0:material-tap-target-prompt-3.0.0.aar:e4d3c472b2d378e39a6535b7788e6c790fc9dde2d7659974e006ed8c7260911d',
     ]
 }
diff --git a/briar-api/src/main/java/org/briarproject/briar/api/sharing/Shareable.java b/briar-api/src/main/java/org/briarproject/briar/api/sharing/Shareable.java
index 4d43715f5..c04f210f3 100644
--- a/briar-api/src/main/java/org/briarproject/briar/api/sharing/Shareable.java
+++ b/briar-api/src/main/java/org/briarproject/briar/api/sharing/Shareable.java
@@ -1,8 +1,8 @@
 package org.briarproject.briar.api.sharing;
 
+import org.briarproject.bramble.api.Nameable;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
-import org.briarproject.bramble.api.Nameable;
 
 @NotNullByDefault
 public interface Shareable extends Nameable {
diff --git a/briar-core/build.gradle b/briar-core/build.gradle
index 598513b52..14bc3aa16 100644
--- a/briar-core/build.gradle
+++ b/briar-core/build.gradle
@@ -12,10 +12,11 @@ dependencies {
 	implementation project(path: ':briar-api', configuration: 'default')
 	implementation 'com.rometools:rome:1.12.1'
 	implementation 'org.jdom:jdom2:2.0.6'
-	implementation 'com.squareup.okhttp3:okhttp:3.12.2'
+	// okhttp 3.12.x is supported until end of 2020, newer versions need minSdk 21
+	implementation 'com.squareup.okhttp3:okhttp:3.12.6'
 	implementation 'org.jsoup:jsoup:1.11.3'
 
-	annotationProcessor 'com.google.dagger:dagger-compiler:2.22.1'
+	annotationProcessor 'com.google.dagger:dagger-compiler:2.24'
 
 	testImplementation project(path: ':bramble-core', configuration: 'default')
 	testImplementation project(path: ':bramble-core', configuration: 'testOutput')
@@ -26,7 +27,7 @@ dependencies {
 	testImplementation "org.jmock:jmock-junit4:2.8.2"
 	testImplementation "org.jmock:jmock-legacy:2.8.2"
 
-	testAnnotationProcessor 'com.google.dagger:dagger-compiler:2.22.1'
+	testAnnotationProcessor 'com.google.dagger:dagger-compiler:2.24'
 
 	signature 'org.codehaus.mojo.signature:java16:1.1@signature'
 }
diff --git a/briar-core/src/main/java/org/briarproject/briar/sharing/ForumProtocolEngineImpl.java b/briar-core/src/main/java/org/briarproject/briar/sharing/ForumProtocolEngineImpl.java
index 192a9a550..22acc4231 100644
--- a/briar-core/src/main/java/org/briarproject/briar/sharing/ForumProtocolEngineImpl.java
+++ b/briar-core/src/main/java/org/briarproject/briar/sharing/ForumProtocolEngineImpl.java
@@ -13,12 +13,12 @@ import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.api.versioning.ClientVersioningManager;
 import org.briarproject.briar.api.client.MessageTracker;
+import org.briarproject.briar.api.conversation.ConversationRequest;
 import org.briarproject.briar.api.forum.Forum;
 import org.briarproject.briar.api.forum.ForumInvitationResponse;
 import org.briarproject.briar.api.forum.ForumManager;
 import org.briarproject.briar.api.forum.event.ForumInvitationRequestReceivedEvent;
 import org.briarproject.briar.api.forum.event.ForumInvitationResponseReceivedEvent;
-import org.briarproject.briar.api.conversation.ConversationRequest;
 
 import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
diff --git a/briar-core/witness.gradle b/briar-core/witness.gradle
index 5e16aadf2..603dd3432 100644
--- a/briar-core/witness.gradle
+++ b/briar-core/witness.gradle
@@ -1,31 +1,35 @@
 dependencyVerification {
     verify = [
         'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
-        'com.google.code.findbugs:jsr305:1.3.9:jsr305-1.3.9.jar:905721a0eea90a81534abb7ee6ef4ea2e5e645fa1def0a5cd88402df1b46c9ed',
-        'com.google.dagger:dagger-compiler:2.22.1:dagger-compiler-2.22.1.jar:e5f28302cbe70a79d3620cddebfb8ec0736814f3980ffe1e673bfe3342f507d3',
-        'com.google.dagger:dagger-producers:2.22.1:dagger-producers-2.22.1.jar:f834a0082014213a68ff06a0f048d750178d02196c58b0b15beb367d32b97e35',
-        'com.google.dagger:dagger-spi:2.22.1:dagger-spi-2.22.1.jar:4b0b922793b3bcb91b99fabb75dba77c68afd7ae4c5f0c4fd6ba681f0a291c7d',
-        'com.google.dagger:dagger:2.22.1:dagger-2.22.1.jar:329d4340f24c4f5717af016c097e90668bfea2a5376e6aa9964b01cef3fd241a',
-        'com.google.errorprone:error_prone_annotations:2.1.3:error_prone_annotations-2.1.3.jar:03d0329547c13da9e17c634d1049ea2ead093925e290567e1a364fd6b1fc7ff8',
+        'com.google.code.findbugs:jsr305:3.0.2:jsr305-3.0.2.jar:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
+        'com.google.dagger:dagger-compiler:2.24:dagger-compiler-2.24.jar:3c5afb955fb188da485cb2c048eff37dce0e1530b9780a0f2f7187d16d1ccc1f',
+        'com.google.dagger:dagger-producers:2.24:dagger-producers-2.24.jar:f10f45b95191954d5d6b043fca9e62fb621d21bf70634b8f8476c7988b504c3a',
+        'com.google.dagger:dagger-spi:2.24:dagger-spi-2.24.jar:c038445d14dbcb4054e61bf49e05009edf26fce4fdc7ec1a9db544784f68e718',
+        'com.google.dagger:dagger:2.24:dagger-2.24.jar:550a6e46a6dfcdf1d764887b6090cea94f783327e50e5c73754f18facfc70b64',
+        'com.google.errorprone:error_prone_annotations:2.2.0:error_prone_annotations-2.2.0.jar:6ebd22ca1b9d8ec06d41de8d64e0596981d9607b42035f9ed374f9de271a481a',
         'com.google.errorprone:javac-shaded:9-dev-r4023-3:javac-shaded-9-dev-r4023-3.jar:65bfccf60986c47fbc17c9ebab0be626afc41741e0a6ec7109e0768817a36f30',
         'com.google.googlejavaformat:google-java-format:1.5:google-java-format-1.5.jar:aa19ad7850fb85178aa22f2fddb163b84d6ce4d0035872f30d4408195ca1144e',
-        'com.google.guava:guava:25.0-jre:guava-25.0-jre.jar:3fd4341776428c7e0e5c18a7c10de129475b69ab9d30aeafbb5c277bb6074fa9',
+        'com.google.guava:failureaccess:1.0.1:failureaccess-1.0.1.jar:a171ee4c734dd2da837e4b16be9df4661afab72a41adaf31eb84dfdaf936ca26',
+        'com.google.guava:guava:27.1-jre:guava-27.1-jre.jar:4a5aa70cc968a4d137e599ad37553e5cfeed2265e8c193476d7119036c536fe7',
+        'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava:listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar:b372a037d4230aa57fbeffdef30fd6123f9c0c2db85d0aced00c91b974f33f99',
         'com.google.j2objc:j2objc-annotations:1.1:j2objc-annotations-1.1.jar:2994a7eb78f2710bd3d3bfb639b2c94e219cedac0d4d084d516e78c16dddecf6',
         'com.rometools:rome-utils:1.12.1:rome-utils-1.12.1.jar:d65ce5f0926ee80e1ed19b176428846098000fc4db09360a1b4dd3a1a36ed477',
         'com.rometools:rome:1.12.1:rome-1.12.1.jar:13414d70a6c185e1374588321861c6e9eb7928eee502d032094ef3ca0fd921ae',
-        'com.squareup.okhttp3:okhttp:3.12.2:okhttp-3.12.2.jar:ada4af7d0d82d56a65947bfc8e1d39d1f22a9a7cc568fcbc48b41288891606ad',
+        'com.squareup.okhttp3:okhttp:3.12.6:okhttp-3.12.6.jar:ab45b9be99d9f070662b722cece5bdc2a0449fd34b9d5e51cdcd34663ae7b610',
         'com.squareup.okio:okio:1.15.0:okio-1.15.0.jar:693fa319a7e8843300602b204023b7674f106ebcb577f2dd5807212b66118bd2',
         'com.squareup:javapoet:1.11.1:javapoet-1.11.1.jar:9cbf2107be499ec6e95afd36b58e3ca122a24166cdd375732e51267d64058e90',
         'javax.annotation:jsr250-api:1.0:jsr250-api-1.0.jar:a1a922d0d9b6d183ed3800dfac01d1e1eb159f0e8c6f94736931c1def54a941f',
         'javax.inject:javax.inject:1:javax.inject-1.jar:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
         'junit:junit:4.12:junit-4.12.jar:59721f0805e223d84b90677887d9ff567dc534d7c502ca903c0c2b17f05c116a',
         'net.jodah:concurrentunit:0.4.2:concurrentunit-0.4.2.jar:5583078e1acf91734939e985bc9e7ee947b0e93a8eef679da6bb07bbeb47ced3',
+        'net.ltgt.gradle.incap:incap:0.2:incap-0.2.jar:b625b9806b0f1e4bc7a2e3457119488de3cd57ea20feedd513db070a573a4ffd',
         'org.apache.ant:ant-launcher:1.9.4:ant-launcher-1.9.4.jar:7bccea20b41801ca17bcbc909a78c835d0f443f12d639c77bd6ae3d05861608d',
         'org.apache.ant:ant:1.9.4:ant-1.9.4.jar:649ae0730251de07b8913f49286d46bba7b92d47c5f332610aa426c4f02161d8',
         'org.beanshell:bsh:1.3.0:bsh-1.3.0.jar:9b04edc75d19db54f1b4e8b5355e9364384c6cf71eb0a1b9724c159d779879f8',
         'org.checkerframework:checker-compat-qual:2.5.3:checker-compat-qual-2.5.3.jar:d76b9afea61c7c082908023f0cbc1427fab9abd2df915c8b8a3e7a509bccbc6d',
+        'org.checkerframework:checker-qual:2.5.2:checker-qual-2.5.2.jar:64b02691c8b9d4e7700f8ee2e742dce7ea2c6e81e662b7522c9ee3bf568c040a',
         'org.codehaus.mojo.signature:java16:1.1:java16-1.1.signature:53799223a2c98dba2d0add810bed76315460df285c69e4f397ae6098f87dd619',
-        'org.codehaus.mojo:animal-sniffer-annotations:1.14:animal-sniffer-annotations-1.14.jar:2068320bd6bad744c3673ab048f67e30bef8f518996fa380033556600669905d',
+        'org.codehaus.mojo:animal-sniffer-annotations:1.17:animal-sniffer-annotations-1.17.jar:92654f493ecfec52082e76354f0ebf87648dc3d5cec2e3c3cdb947c016747a53',
         'org.codehaus.mojo:animal-sniffer-ant-tasks:1.16:animal-sniffer-ant-tasks-1.16.jar:890040976fbe2d584619a6a61b1fd2e925b3b5eb342a85eb2762c467c0d64e90',
         'org.codehaus.mojo:animal-sniffer:1.16:animal-sniffer-1.16.jar:72be8bcc226ba43b937c722a08a07852bfa1b11400089265d5df0ee7b38b1d52',
         'org.hamcrest:hamcrest-core:1.3:hamcrest-core-1.3.jar:66fdef91e9739348df7a096aa384a5685f4e875584cce89386a7a47251c4d8e9',
diff --git a/briar-headless/build.gradle b/briar-headless/build.gradle
index c9b463af1..a0bb32ab4 100644
--- a/briar-headless/build.gradle
+++ b/briar-headless/build.gradle
@@ -20,7 +20,7 @@ dependencies {
 	implementation 'com.fasterxml.jackson.core:jackson-databind:2.9.8'
 	implementation 'com.github.ajalt:clikt:2.0.0'
 
-	def daggerVersion = '2.22.1'
+	def daggerVersion = '2.24'
 	kapt "com.google.dagger:dagger-compiler:$daggerVersion"
 
 	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
diff --git a/briar-headless/witness.gradle b/briar-headless/witness.gradle
index 347be7028..511e30a1d 100644
--- a/briar-headless/witness.gradle
+++ b/briar-headless/witness.gradle
@@ -4,15 +4,17 @@ dependencyVerification {
         'com.fasterxml.jackson.core:jackson-core:2.9.8:jackson-core-2.9.8.jar:d934dab0bd48994eeea2c1b493cb547158a338a80b58c4fbc8e85fb0905e105f',
         'com.fasterxml.jackson.core:jackson-databind:2.9.8:jackson-databind-2.9.8.jar:2351c3eba73a545db9079f5d6d768347ad72666537362c8220fe3e950a55a864',
         'com.github.ajalt:clikt:2.0.0:clikt-2.0.0.jar:c247adb96337e0799bf6d84f4c494df9d8f1e46e9157eacaf438d03323ee9475',
-        'com.google.code.findbugs:jsr305:1.3.9:jsr305-1.3.9.jar:905721a0eea90a81534abb7ee6ef4ea2e5e645fa1def0a5cd88402df1b46c9ed',
-        'com.google.dagger:dagger-compiler:2.22.1:dagger-compiler-2.22.1.jar:e5f28302cbe70a79d3620cddebfb8ec0736814f3980ffe1e673bfe3342f507d3',
-        'com.google.dagger:dagger-producers:2.22.1:dagger-producers-2.22.1.jar:f834a0082014213a68ff06a0f048d750178d02196c58b0b15beb367d32b97e35',
-        'com.google.dagger:dagger-spi:2.22.1:dagger-spi-2.22.1.jar:4b0b922793b3bcb91b99fabb75dba77c68afd7ae4c5f0c4fd6ba681f0a291c7d',
-        'com.google.dagger:dagger:2.22.1:dagger-2.22.1.jar:329d4340f24c4f5717af016c097e90668bfea2a5376e6aa9964b01cef3fd241a',
-        'com.google.errorprone:error_prone_annotations:2.1.3:error_prone_annotations-2.1.3.jar:03d0329547c13da9e17c634d1049ea2ead093925e290567e1a364fd6b1fc7ff8',
+        'com.google.code.findbugs:jsr305:3.0.2:jsr305-3.0.2.jar:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
+        'com.google.dagger:dagger-compiler:2.24:dagger-compiler-2.24.jar:3c5afb955fb188da485cb2c048eff37dce0e1530b9780a0f2f7187d16d1ccc1f',
+        'com.google.dagger:dagger-producers:2.24:dagger-producers-2.24.jar:f10f45b95191954d5d6b043fca9e62fb621d21bf70634b8f8476c7988b504c3a',
+        'com.google.dagger:dagger-spi:2.24:dagger-spi-2.24.jar:c038445d14dbcb4054e61bf49e05009edf26fce4fdc7ec1a9db544784f68e718',
+        'com.google.dagger:dagger:2.24:dagger-2.24.jar:550a6e46a6dfcdf1d764887b6090cea94f783327e50e5c73754f18facfc70b64',
+        'com.google.errorprone:error_prone_annotations:2.2.0:error_prone_annotations-2.2.0.jar:6ebd22ca1b9d8ec06d41de8d64e0596981d9607b42035f9ed374f9de271a481a',
         'com.google.errorprone:javac-shaded:9-dev-r4023-3:javac-shaded-9-dev-r4023-3.jar:65bfccf60986c47fbc17c9ebab0be626afc41741e0a6ec7109e0768817a36f30',
         'com.google.googlejavaformat:google-java-format:1.5:google-java-format-1.5.jar:aa19ad7850fb85178aa22f2fddb163b84d6ce4d0035872f30d4408195ca1144e',
-        'com.google.guava:guava:25.0-jre:guava-25.0-jre.jar:3fd4341776428c7e0e5c18a7c10de129475b69ab9d30aeafbb5c277bb6074fa9',
+        'com.google.guava:failureaccess:1.0.1:failureaccess-1.0.1.jar:a171ee4c734dd2da837e4b16be9df4661afab72a41adaf31eb84dfdaf936ca26',
+        'com.google.guava:guava:27.1-jre:guava-27.1-jre.jar:4a5aa70cc968a4d137e599ad37553e5cfeed2265e8c193476d7119036c536fe7',
+        'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava:listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar:b372a037d4230aa57fbeffdef30fd6123f9c0c2db85d0aced00c91b974f33f99',
         'com.google.j2objc:j2objc-annotations:1.1:j2objc-annotations-1.1.jar:2994a7eb78f2710bd3d3bfb639b2c94e219cedac0d4d084d516e78c16dddecf6',
         'com.squareup:javapoet:1.11.1:javapoet-1.11.1.jar:9cbf2107be499ec6e95afd36b58e3ca122a24166cdd375732e51267d64058e90',
         'com.vaadin.external.google:android-json:0.0.20131108.vaadin1:android-json-0.0.20131108.vaadin1.jar:dfb7bae2f404cfe0b72b4d23944698cb716b7665171812a0a4d0f5926c0fac79',
@@ -30,9 +32,11 @@ dependencyVerification {
         'khttp:khttp:0.1.0:khttp-0.1.0.jar:48ab3bd22e461f2c2e74e3446d8f9568e24aab157f61fdc85ded6c0bfbe9a926',
         'net.bytebuddy:byte-buddy-agent:1.9.10:byte-buddy-agent-1.9.10.jar:8ed739d29132103250d307d2e8e3c95f07588ef0543ab11d2881d00768a5e182',
         'net.bytebuddy:byte-buddy:1.9.10:byte-buddy-1.9.10.jar:2936debc4d7b6c534848d361412e2d0f8bd06f7f27a6f4e728a20e97648d2bf3',
+        'net.ltgt.gradle.incap:incap:0.2:incap-0.2.jar:b625b9806b0f1e4bc7a2e3457119488de3cd57ea20feedd513db070a573a4ffd',
         'org.apiguardian:apiguardian-api:1.0.0:apiguardian-api-1.0.0.jar:1f58b77470d8d147a0538d515347dd322f49a83b9e884b8970051160464b65b3',
         'org.checkerframework:checker-compat-qual:2.5.3:checker-compat-qual-2.5.3.jar:d76b9afea61c7c082908023f0cbc1427fab9abd2df915c8b8a3e7a509bccbc6d',
-        'org.codehaus.mojo:animal-sniffer-annotations:1.14:animal-sniffer-annotations-1.14.jar:2068320bd6bad744c3673ab048f67e30bef8f518996fa380033556600669905d',
+        'org.checkerframework:checker-qual:2.5.2:checker-qual-2.5.2.jar:64b02691c8b9d4e7700f8ee2e742dce7ea2c6e81e662b7522c9ee3bf568c040a',
+        'org.codehaus.mojo:animal-sniffer-annotations:1.17:animal-sniffer-annotations-1.17.jar:92654f493ecfec52082e76354f0ebf87648dc3d5cec2e3c3cdb947c016747a53',
         'org.eclipse.jetty.websocket:websocket-api:9.4.15.v20190215:websocket-api-9.4.15.v20190215.jar:dd02de2d37c6ab4f96a2dfe0a54890dbd43731a9a42ce6e1c27cbc173283de85',
         'org.eclipse.jetty.websocket:websocket-client:9.4.15.v20190215:websocket-client-9.4.15.v20190215.jar:b1ebbd22278233db8536cf0a7743b31dd12d7ce31b01546895588ed8f6c132df',
         'org.eclipse.jetty.websocket:websocket-common:9.4.15.v20190215:websocket-common-9.4.15.v20190215.jar:ccfafda2d235e5dd1a665f8010d8c022a7d1f959e0f3eb6ee4acb92bd0047450',
diff --git a/build.gradle b/build.gradle
index 996b0a1c6..157f13f45 100644
--- a/build.gradle
+++ b/build.gradle
@@ -28,7 +28,7 @@ buildscript {
 	}
 
 	dependencies {
-		classpath 'com.android.tools.build:gradle:3.4.0'
+		classpath 'com.android.tools.build:gradle:3.5.1'
 		classpath 'ru.vyarus:gradle-animalsniffer-plugin:1.5.0'
 		classpath files('libs/gradle-witness.jar')
 	}
diff --git a/gradle.properties b/gradle.properties
index 750a6fc0e..2963e97bc 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,3 +1,5 @@
 noWitness=androidApis,_internal_aapt2_binary
 android.enableUnitTestBinaryResources=true
-org.gradle.jvmargs=-Xmx1g
\ No newline at end of file
+org.gradle.jvmargs=-Xmx1g
+android.useAndroidX=true
+android.enableJetifier=true
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index d67eeef50..217614cd4 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,7 @@
+#Mon Oct 14 13:25:25 BRT 2019
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.4-all.zip
-distributionSha256Sum=f177768e7a032727e4338c8fd047f8f263e5bd283f67a7766c1ba4182c8455a6
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.2-all.zip
+distributionSha256Sum=027fdd265d277bae65a0d349b6b8da02135b0b8e14ba891e26281fa877fe37a2