Replace a statment lambda with method reference

Menu item to enable/disable disappearing messages

See merge request briar/briar!1321

.idea/runConfigurations/All_tests.xml

@@ -1,6 +1,6 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="briar-android" />
+    <module name="briar.briar-android" />
     <option name="PACKAGE_NAME" value="" />
     <option name="MAIN_CLASS_NAME" value="" />
     <option name="METHOD_NAME" value="" />

.idea/runConfigurations/All_tests_in_bramble_android.xml

@@ -1,20 +1,14 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests in bramble-android" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="bramble-android" />
-    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-    <option name="ALTERNATIVE_JRE_PATH" />
+    <module name="briar.bramble-android" />
     <option name="PACKAGE_NAME" value="" />
     <option name="MAIN_CLASS_NAME" value="" />
     <option name="METHOD_NAME" value="" />
     <option name="TEST_OBJECT" value="package" />
-    <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/bramble-android" />
-    <option name="PASS_PARENT_ENVS" value="true" />
-    <option name="TEST_SEARCH_SCOPE">
-      <value defaultName="singleModule" />
-    </option>
-    <patterns />
-    <method />
+    <method v="2">
+      <option name="Android.Gradle.BeforeRunTask" enabled="true" />
+    </method>
   </configuration>
 </component>

.idea/runConfigurations/All_tests_in_bramble_api.xml

@@ -1,20 +1,14 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests in bramble-api" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="bramble-api" />
-    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-    <option name="ALTERNATIVE_JRE_PATH" />
+    <module name="briar.bramble-api" />
     <option name="PACKAGE_NAME" value="" />
     <option name="MAIN_CLASS_NAME" value="" />
     <option name="METHOD_NAME" value="" />
     <option name="TEST_OBJECT" value="package" />
-    <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/bramble-api" />
-    <option name="PASS_PARENT_ENVS" value="true" />
-    <option name="TEST_SEARCH_SCOPE">
-      <value defaultName="singleModule" />
-    </option>
-    <patterns />
-    <method />
+    <method v="2">
+      <option name="Android.Gradle.BeforeRunTask" enabled="true" />
+    </method>
   </configuration>
 </component>

.idea/runConfigurations/All_tests_in_bramble_core.xml

@@ -1,20 +1,14 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests in bramble-core" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="bramble-core" />
-    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-    <option name="ALTERNATIVE_JRE_PATH" />
+    <module name="briar.bramble-core" />
     <option name="PACKAGE_NAME" value="" />
     <option name="MAIN_CLASS_NAME" value="" />
     <option name="METHOD_NAME" value="" />
     <option name="TEST_OBJECT" value="package" />
-    <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/bramble-core" />
-    <option name="PASS_PARENT_ENVS" value="true" />
-    <option name="TEST_SEARCH_SCOPE">
-      <value defaultName="singleModule" />
-    </option>
-    <patterns />
-    <method />
+    <method v="2">
+      <option name="Android.Gradle.BeforeRunTask" enabled="true" />
+    </method>
   </configuration>
 </component>

.idea/runConfigurations/All_tests_in_bramble_java.xml

@@ -1,8 +1,6 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests in bramble-java" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="bramble-java" />
-    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-    <option name="ALTERNATIVE_JRE_PATH" />
+    <module name="briar.bramble-java" />
     <option name="PACKAGE_NAME" value="" />
     <option name="MAIN_CLASS_NAME" value="" />
     <option name="METHOD_NAME" value="" />
@@ -10,11 +8,8 @@
     <option name="VM_PARAMETERS" value="-ea -Djava.library.path=libs" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/bramble-java" />
-    <option name="PASS_PARENT_ENVS" value="true" />
-    <option name="TEST_SEARCH_SCOPE">
-      <value defaultName="singleModule" />
-    </option>
-    <patterns />
-    <method />
+    <method v="2">
+      <option name="Android.Gradle.BeforeRunTask" enabled="true" />
+    </method>
   </configuration>
 </component>

.idea/runConfigurations/All_tests_in_briar_android.xml

@@ -1,20 +1,14 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests in briar-android" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="briar-android" />
-    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-    <option name="ALTERNATIVE_JRE_PATH" />
+    <module name="briar.briar-android" />
     <option name="PACKAGE_NAME" value="" />
     <option name="MAIN_CLASS_NAME" value="" />
     <option name="METHOD_NAME" value="" />
     <option name="TEST_OBJECT" value="package" />
-    <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/briar-android" />
-    <option name="PASS_PARENT_ENVS" value="true" />
-    <option name="TEST_SEARCH_SCOPE">
-      <value defaultName="singleModule" />
-    </option>
-    <patterns />
-    <method />
+    <method v="2">
+      <option name="Android.Gradle.BeforeRunTask" enabled="true" />
+    </method>
   </configuration>
 </component>

.idea/runConfigurations/All_tests_in_briar_core.xml

@@ -1,20 +1,14 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests in briar-core" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="briar-core" />
-    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-    <option name="ALTERNATIVE_JRE_PATH" />
+    <module name="briar.briar-core" />
     <option name="PACKAGE_NAME" value="" />
     <option name="MAIN_CLASS_NAME" value="" />
     <option name="METHOD_NAME" value="" />
     <option name="TEST_OBJECT" value="package" />
-    <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="file://$PROJECT_DIR$/briar-core" />
-    <option name="PASS_PARENT_ENVS" value="true" />
-    <option name="TEST_SEARCH_SCOPE">
-      <value defaultName="singleModule" />
-    </option>
-    <patterns />
-    <method />
+    <method v="2">
+      <option name="Android.Gradle.BeforeRunTask" enabled="true" />
+    </method>
   </configuration>
 </component>

.idea/runConfigurations/All_tests_in_briar_headless.xml

@@ -1,6 +1,6 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="All tests in briar-headless" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="briar-headless" />
+    <module name="briar.briar-headless" />
     <option name="PACKAGE_NAME" value="org.briarproject.briar.headless" />
     <option name="MAIN_CLASS_NAME" value="" />
     <option name="METHOD_NAME" value="" />

.idea/runConfigurations/H2_Performance_Test.xml

@@ -1,20 +1,14 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="H2 Performance Test" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="bramble-core" />
-    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-    <option name="ALTERNATIVE_JRE_PATH" />
+    <module name="briar.bramble-core" />
     <option name="PACKAGE_NAME" value="org.briarproject.bramble.db" />
     <option name="MAIN_CLASS_NAME" value="org.briarproject.bramble.db.H2DatabasePerformanceTest" />
     <option name="METHOD_NAME" value="" />
     <option name="TEST_OBJECT" value="class" />
-    <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="" />
-    <option name="PASS_PARENT_ENVS" value="true" />
-    <option name="TEST_SEARCH_SCOPE">
-      <value defaultName="singleModule" />
-    </option>
-    <patterns />
-    <method />
+    <method v="2">
+      <option name="Android.Gradle.BeforeRunTask" enabled="true" />
+    </method>
   </configuration>
 </component>

.idea/runConfigurations/HyperSQL_Performance_Test.xml

@@ -1,20 +1,14 @@
 <component name="ProjectRunConfigurationManager">
   <configuration default="false" name="HyperSQL Performance Test" type="AndroidJUnit" factoryName="Android JUnit">
-    <module name="bramble-core" />
-    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-    <option name="ALTERNATIVE_JRE_PATH" />
+    <module name="briar.bramble-core" />
     <option name="PACKAGE_NAME" value="org.briarproject.bramble.db" />
     <option name="MAIN_CLASS_NAME" value="org.briarproject.bramble.db.HyperSqlDatabasePerformanceTest" />
     <option name="METHOD_NAME" value="" />
     <option name="TEST_OBJECT" value="class" />
-    <option name="VM_PARAMETERS" value="-ea" />
     <option name="PARAMETERS" value="" />
     <option name="WORKING_DIRECTORY" value="" />
-    <option name="PASS_PARENT_ENVS" value="true" />
-    <option name="TEST_SEARCH_SCOPE">
-      <value defaultName="singleModule" />
-    </option>
-    <patterns />
-    <method />
+    <method v="2">
+      <option name="Android.Gradle.BeforeRunTask" enabled="true" />
+    </method>
   </configuration>
 </component>

.idea/runConfigurations/briar_headless.xml

@@ -1,6 +1,6 @@
 <component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="briar-headless" type="JetRunConfigurationType" factoryName="Kotlin" singleton="true">
-    <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
+  <configuration default="false" name="briar-headless" type="JetRunConfigurationType" singleton="true">
+    <module name="briar.briar-headless" />
     <option name="VM_PARAMETERS" value="" />
     <option name="PROGRAM_PARAMETERS" value="-v" />
     <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
@@ -8,9 +8,8 @@
     <option name="PASS_PARENT_ENVS" value="true" />
     <option name="MAIN_CLASS_NAME" value="org.briarproject.briar.headless.MainKt" />
     <option name="WORKING_DIRECTORY" value="" />
-    <module name="briar-headless" />
-    <envs />
-    <method>
+    <method v="2">
+      <option name="Make" enabled="true" />
       <option name="Gradle.BeforeRunTask" enabled="true" tasks="jar" externalProjectPath="$PROJECT_DIR$/briar-headless" vmOptions="" scriptParameters="" />
     </method>
   </configuration>

bramble-android/build.gradle

@@ -38,7 +38,7 @@ configurations {
 
 dependencies {
 	implementation project(path: ':bramble-core', configuration: 'default')
-	tor 'org.briarproject:tor-android:0.3.5.10@zip'
+	tor 'org.briarproject:tor-android:0.3.5.12@zip'
 	tor 'org.briarproject:obfs4proxy-android:0.0.11-2@zip'
 
 	annotationProcessor 'com.google.dagger:dagger-compiler:2.24'

bramble-android/witness.gradle

@@ -1,33 +1,36 @@
 dependencyVerification {
     verify = [
         'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
-        '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.android.tools.analytics-library:protos:27.1.1:protos-27.1.1.jar:13f77e73762e58ab372d140b3a6be6903aea9775b62dd14fbc62d4cc7069c9a4',
+        'com.android.tools.analytics-library:shared:27.1.1:shared-27.1.1.jar:82930a52001410e97d809930b670f4de3002286975f046b9de5f6b777b06d366',
+        'com.android.tools.analytics-library:tracker:27.1.1:tracker-27.1.1.jar:31bc5a00be0055bac89c9b2f34751883e987cd89e3ac1783720645c164f591d9',
+        'com.android.tools.build:aapt2-proto:4.1.0-alpha01-6193524:aapt2-proto-4.1.0-alpha01-6193524.jar:17e75523e1e92dd4f222c7368ee41df9e964a508232f591e265d0c499baf9dca',
+        'com.android.tools.build:apksig:4.1.1:apksig-4.1.1.jar:e0a69da9e5a03986d608b45bbf954ef0e6a0b3f58c1b8315bd169ec08b279e72',
+        'com.android.tools.build:apkzlib:4.1.1:apkzlib-4.1.1.jar:ba4b5e419b6be0130eae7f8301c3a551ad3976f487d2e0c6852ebb175ac41127',
+        'com.android.tools.build:builder-model:4.1.1:builder-model-4.1.1.jar:e95c99cc298ad67b8deb6ced99c51abc8f59afebedad044b1a10dde14646a4dd',
+        'com.android.tools.build:builder-test-api:4.1.1:builder-test-api-4.1.1.jar:464f596ab261c051c3847406748e843770dea123f6fa5fee8a9390644e709b7a',
+        'com.android.tools.build:builder:4.1.1:builder-4.1.1.jar:0f78d4759d2f7b57b95865522ec34596ba419b9982f3b25e3449213f9c98b80d',
+        'com.android.tools.build:gradle-api:4.1.1:gradle-api-4.1.1.jar:d42e6b539e4c1353ad3546e75ec8ce11a017b97481023e8ea18577eefe374358',
+        'com.android.tools.build:manifest-merger:27.1.1:manifest-merger-27.1.1.jar:7a45fa143687859bb2e5a961dcf6ee88094d3853de0cb543dc03dbcb0f4b554b',
+        'com.android.tools.ddms:ddmlib:27.1.1:ddmlib-27.1.1.jar:da6e4bd834b6a85dae8019039849d8bd96933347dfbf460df74913ddade6e40a',
+        'com.android.tools.external.com-intellij:intellij-core:27.1.1:intellij-core-27.1.1.jar:2591a7363c4443c59bf9f793730acafce9d6ec3076e2f46716edaf53a41b6fb6',
+        'com.android.tools.external.com-intellij:kotlin-compiler:27.1.1:kotlin-compiler-27.1.1.jar:5054ae770ba788f110303c65abd6b1fa28eccf52dee1274510e201b2b81885c8',
+        'com.android.tools.external.org-jetbrains:uast:27.1.1:uast-27.1.1.jar:54cd8f6886a9d2f5641659dd5c91f626629672cd48301f7f0bd6aad9bd448714',
+        'com.android.tools.layoutlib:layoutlib-api:27.1.1:layoutlib-api-27.1.1.jar:8a9a22e3b309521ea83b724e5a89cfdac6076f52d675c0e17d77b05527bc0f8c',
+        'com.android.tools.lint:lint-api:27.1.1:lint-api-27.1.1.jar:c1d8176094cb0478786070d40533efb578ebc53529a82f6ef5bee879bdca418b',
+        'com.android.tools.lint:lint-checks:27.1.1:lint-checks-27.1.1.jar:3899c91e00bd059b40c31a9ca00cd0f8303191947608735ae1b657323693fb61',
+        'com.android.tools.lint:lint-gradle-api:27.1.1:lint-gradle-api-27.1.1.jar:26aa89d38b9825cc73229daa82a68875801c8b8491f30497ce62aff1f206eb0d',
+        'com.android.tools.lint:lint-gradle:27.1.1:lint-gradle-27.1.1.jar:f7355823ead869f4d28184ba28b7a0c693b507519a2d3705bb9848a0f35b3756',
+        'com.android.tools.lint:lint-model:27.1.1:lint-model-27.1.1.jar:bc23c0c413bdfca59dac2cd56b870d8360d009e9ec0d365e71f774bcf127971d',
+        'com.android.tools.lint:lint:27.1.1:lint-27.1.1.jar:2f6038a5398a42bd591883c3f5e5894f4ec52ca1c3683bf94fa8553c1700af81',
+        'com.android.tools:annotations:27.1.1:annotations-27.1.1.jar:ff28c504d2acb9fd1a5ffbd97ae85cf59ee18c76927525aad250509bccf2cab1',
+        'com.android.tools:common:27.1.1:common-27.1.1.jar:63d9a2a9ad6d278db319f3749b9f50bdf5457ef7020074a1bebe124e714b535c',
+        'com.android.tools:dvlib:27.1.1:dvlib-27.1.1.jar:998a54201fc1cefee5f2399215e95c42b1f64f9e1d8f4452eb8255c68ba5440f',
+        'com.android.tools:repository:27.1.1:repository-27.1.1.jar:d25b74ccabf4d876903efb375e9af6fb380d8ae0445bb74bbdcc225c1e37fa1d',
+        'com.android.tools:sdk-common:27.1.1:sdk-common-27.1.1.jar:4473ae97d0ef7061ee1de61041d5aa97405ae08e44c09cf7bb278b42e4b97c7c',
+        'com.android.tools:sdklib:27.1.1:sdklib-27.1.1.jar:08e6b83961ac9724b3c1e3d0eff971f13be6701292c77914b8794480f3391250',
+        'com.android:signflinger:4.1.1:signflinger-4.1.1.jar:0c66825988873ec2d51057fa463f54a8f18fc7326ff4530b9da363b71e97ce60',
+        'com.android:zipflinger:4.1.1:zipflinger-4.1.1.jar:0a8c3e52ac13dd031236f9fb5ba4408b1d5dcd12325a05440b36da09d8881446',
         'com.google.code.findbugs:jsr305:3.0.2:jsr305-3.0.2.jar:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
         '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',
@@ -35,27 +38,30 @@ dependencyVerification {
         '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:error_prone_annotations:2.3.2:error_prone_annotations-2.3.2.jar:357cd6cfb067c969226c442451502aee13800a24e950fdfde77bcdb4565a668d',
         '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: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:guava:28.1-jre:guava-28.1-jre.jar:30beb8b8527bd07c6e747e77f1a92122c2f29d57ce347461a4a55eb26e382da4',
         '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.j2objc:j2objc-annotations:1.3:j2objc-annotations-1.3.jar:21af30c92267bd6122c0e0b4d20cccb6641a37eaf956c6540ec471d584e64a7b',
         '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',
+        'com.google.protobuf:protobuf-java:3.10.0:protobuf-java-3.10.0.jar:161d7d61a8cb3970891c299578702fd079646e032329d6c2cabf998d191437c9',
         'com.googlecode.json-simple:json-simple:1.1:json-simple-1.1.jar:2d9484f4c649f708f47f9a479465fc729770ee65617dca3011836602264f6439',
         'com.squareup:javapoet:1.11.1:javapoet-1.11.1.jar:9cbf2107be499ec6e95afd36b58e3ca122a24166cdd375732e51267d64058e90',
         'com.squareup:javawriter:2.5.0:javawriter-2.5.0.jar:fcfb09fb0ea0aa97d3cfe7ea792398081348e468f126b3603cb3803f240197f0',
         'com.sun.activation:javax.activation:1.2.0:javax.activation-1.2.0.jar:993302b16cd7056f21e779cc577d175a810bb4900ef73cd8fbf2b50f928ba9ce',
-        'com.sun.istack:istack-commons-runtime:2.21:istack-commons-runtime-2.21.jar:c33e67a0807095f02a0e2da139412dd7c4f9cc1a4c054b3e434f96831ba950f4',
-        'com.sun.xml.fastinfoset:FastInfoset:1.2.13:FastInfoset-1.2.13.jar:27a77db909f3c2833c0b1a37c55af1db06045118ad2eed96ce567b6632bce038',
+        'com.sun.istack:istack-commons-runtime:3.0.7:istack-commons-runtime-3.0.7.jar:6443e10ba2e259fb821d9b6becf10db5316285fc30c53cec9d7b19a3877e7fdf',
+        'com.sun.xml.fastinfoset:FastInfoset:1.2.15:FastInfoset-1.2.15.jar:785861db11ca1bd0d1956682b974ad73eb19cd3e01a4b3fa82d62eca97210aec',
         'commons-codec:commons-codec:1.10:commons-codec-1.10.jar:4241dfa94e711d435f29a4604a3e2de5c4aa3c165e23bd066be6fc1fc4309569',
         'commons-logging:commons-logging:1.2:commons-logging-1.2.jar:daddea1ea0be0f56978ab3006b8ac92834afeefbd9b7e4e6316fca57df0fa636',
         'it.unimi.dsi:fastutil:7.2.0:fastutil-7.2.0.jar:74fa208043740642f7e6eb09faba15965218ad2f50ce3020efb100136e4b591c',
+        'javax.activation:javax.activation-api:1.2.0:javax.activation-api-1.2.0.jar:43fdef0b5b6ceb31b0424b208b930c74ab58fac2ceeb7b3f6fd3aeb8b5ca4393',
         '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',
+        'javax.xml.bind:jaxb-api:2.3.1:jaxb-api-2.3.1.jar:88b955a0df57880a26a74708bc34f74dcaf8ebf4e78843a28b50eae945732b06',
         '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',
@@ -70,34 +76,35 @@ dependencyVerification {
         'org.bouncycastle:bcpkix-jdk15on:1.56:bcpkix-jdk15on-1.56.jar:7043dee4e9e7175e93e0b36f45b1ec1ecb893c5f755667e8b916eb8dd201c6ca',
         'org.bouncycastle:bcprov-jdk15on:1.56:bcprov-jdk15on-1.56.jar:963e1ee14f808ffb99897d848ddcdb28fa91ddda867eb18d303e82728f878349',
         'org.briarproject:obfs4proxy-android:0.0.11-2:obfs4proxy-android-0.0.11-2.zip:57e55cbe87aa2aac210fdbb6cd8cdeafe15f825406a08ebf77a8b787aa2c6a8a',
-        'org.briarproject:tor-android:0.3.5.10:tor-android-0.3.5.10.zip:edd83bf557fcff2105eaa0bdb3f607a6852ebe7360920929ae3039dd5f4774c5',
+        'org.briarproject:tor-android:0.3.5.12:tor-android-0.3.5.12.zip:db71fb3290acff79d572af0752570eaf6aad7c4d88c9b9aa0b4d5afe2b9ead9c',
         '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.checkerframework:checker-qual:2.8.1:checker-qual-2.8.1.jar:9103499008bcecd4e948da29b17864abb64304e15706444ae209d17ebe0575df',
         'org.codehaus.groovy:groovy-all:2.4.15:groovy-all-2.4.15.jar:51d6c4e71782e85674239189499854359d380fb75e1a703756e3aaa5b98a5af0',
         '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.codehaus.mojo:animal-sniffer-annotations:1.18:animal-sniffer-annotations-1.18.jar:47f05852b48ee9baefef80fa3d8cea60efa4753c0013121dd7fe5eef2e5c729d',
+        'org.glassfish.jaxb:jaxb-runtime:2.3.1:jaxb-runtime-2.3.1.jar:45fecfa5c8217ce1f3652ab95179790ec8cc0dec0384bca51cbeb94a293d9f2f',
+        'org.glassfish.jaxb:txw2:2.3.1:txw2-2.3.1.jar:34975dde1c6920f1a39791142235689bc3cd357e24d05edd8ff93b885bd68d60',
         '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:1.3.50: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.kotlin:kotlin-reflect:1.3.72:kotlin-reflect-1.3.72.jar:a188d9367de1c4ee9479db630985c0597b20709c83161b1430d24edb27e38c40',
+        'org.jetbrains.kotlin:kotlin-stdlib-common:1.3.72:kotlin-stdlib-common-1.3.72.jar:5e7d1552863e480c1628b1cc39ce230ef829f5b7230106215a05acda5172203a',
+        'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.72:kotlin-stdlib-jdk7-1.3.72.jar:40566c0c08d414b9413ba556ff7f8a0b04b98b9f0f424d122dd2088510efccc4',
+        'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.72:kotlin-stdlib-jdk8-1.3.72.jar:133da70cfc07b56094282eac5c59bccd59f167ee2ead22e5282876d8bc10bf95',
+        'org.jetbrains.kotlin:kotlin-stdlib:1.3.72:kotlin-stdlib-1.3.72.jar:3856a7349ebacd6d1be6802b2fed9c4dc2c5a564ea92b6b945ac988243d4b16b',
         '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',
         'org.jmock:jmock-legacy:2.8.2:jmock-legacy-2.8.2.jar:f2b985a5c08a9edb7f37612330c058809da3f6a6d63ce792426ebf8ff0d6d31b',
         '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.jvnet.staxex:stax-ex:1.8:stax-ex-1.8.jar:95b05d9590af4154c6513b9c5dc1fb2e55b539972ba0a9ef28e9a0c01d83ad77',
         'org.objenesis:objenesis:2.1:objenesis-2.1.jar:c74330cc6b806c804fd37e74487b4fe5d7c2750c5e15fbc6efa13bdee1bdef80',
-        'org.ow2.asm:asm-analysis:6.0:asm-analysis-6.0.jar:2f1a6387219c3a6cc4856481f221b03bd9f2408a326d416af09af5d6f608c1f4',
-        'org.ow2.asm:asm-commons:6.0:asm-commons-6.0.jar:f1bce5c648a96a017bdcd01fe5d59af9845297fd7b79b81c015a6fbbd9719abf',
-        'org.ow2.asm:asm-tree:6.0:asm-tree-6.0.jar:887998fb69727c8759e4d253f856822801e33f9fd4caa566b3ac58ee92106215',
-        'org.ow2.asm:asm-util:6.0:asm-util-6.0.jar:356afebdb0f870175262e5188f8709a3b17aa2a5a6a4b0340b04d4b449bca5f6',
+        'org.ow2.asm:asm-analysis:7.0:asm-analysis-7.0.jar:e981f8f650c4d900bb033650b18e122fa6b161eadd5f88978d08751f72ee8474',
+        'org.ow2.asm:asm-commons:7.0:asm-commons-7.0.jar:fed348ef05958e3e846a3ac074a12af5f7936ef3d21ce44a62c4fa08a771927d',
+        'org.ow2.asm:asm-tree:7.0:asm-tree-7.0.jar:cfd7a0874f9de36a999c127feeadfbfe6e04d4a71ee954d7af3d853f0be48a6c',
+        'org.ow2.asm:asm-util:7.0:asm-util-7.0.jar:75fbbca440ef463f41c2b0ab1a80abe67e910ac486da60a7863cbcb5bae7e145',
         'org.ow2.asm:asm:5.0.4:asm-5.0.4.jar:896618ed8ae62702521a78bc7be42b7c491a08e6920a15f89a3ecdec31e9a220',
-        'org.ow2.asm:asm:6.0:asm-6.0.jar:dd8971c74a4e697899a8e95caae4ea8760ea6c486dc6b97b1795e75760420461',
+        'org.ow2.asm:asm:7.0:asm-7.0.jar:b88ef66468b3c978ad0c97fd6e90979e56155b4ac69089ba7a44e9aa7ffe9acf',
     ]
 }

bramble-api/src/main/java/org/briarproject/bramble/api/client/ClientHelper.java

@@ -1,6 +1,7 @@
 package org.briarproject.bramble.api.client;
 
 import org.briarproject.bramble.api.FormatException;
+import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.crypto.PrivateKey;
 import org.briarproject.bramble.api.crypto.PublicKey;
 import org.briarproject.bramble.api.data.BdfDictionary;
@@ -119,4 +120,17 @@ public interface ClientHelper {
 	Map<TransportId, TransportProperties> parseAndValidateTransportPropertiesMap(
 			BdfDictionary properties) throws FormatException;
 
+	/**
+	 * Retrieves the contact ID from the group metadata of the given contact
+	 * group.
+	 */
+	ContactId getContactId(Transaction txn, GroupId contactGroupId)
+		throws DbException, FormatException;
+
+	/**
+	 * Stores the given contact ID in the group metadata of the given contact
+	 * group.
+	 */
+	void setContactId(Transaction txn, GroupId contactGroupId, ContactId c)
+		throws DbException;
 }

bramble-api/src/main/java/org/briarproject/bramble/api/client/ContactGroupConstants.java

@@ -0,0 +1,9 @@
+package org.briarproject.bramble.api.client;
+
+public interface ContactGroupConstants {
+
+	/**
+	 * Group metadata key for associating a contact ID with a contact group.
+	 */
+	String GROUP_KEY_CONTACT_ID = "contactId";
+}

bramble-api/src/main/java/org/briarproject/bramble/util/ValidationUtils.java

@@ -6,7 +6,9 @@ import org.briarproject.bramble.api.data.BdfList;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
 import javax.annotation.Nullable;
+import javax.annotation.concurrent.Immutable;
 
+@Immutable
 @NotNullByDefault
 public class ValidationUtils {
 
@@ -64,4 +66,9 @@ public class ValidationUtils {
 		if (dictionary != null && dictionary.size() != size)
 			throw new FormatException();
 	}
+
+	public static void checkRange(@Nullable Long l, long min, long max)
+			throws FormatException {
+		if (l != null && (l < min || l > max)) throw new FormatException();
+	}
 }

bramble-core/src/main/java/org/briarproject/bramble/client/ClientHelperImpl.java

@@ -2,11 +2,13 @@ package org.briarproject.bramble.client;
 
 import org.briarproject.bramble.api.FormatException;
 import org.briarproject.bramble.api.client.ClientHelper;
+import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.crypto.CryptoComponent;
 import org.briarproject.bramble.api.crypto.KeyParser;
 import org.briarproject.bramble.api.crypto.PrivateKey;
 import org.briarproject.bramble.api.crypto.PublicKey;
 import org.briarproject.bramble.api.data.BdfDictionary;
+import org.briarproject.bramble.api.data.BdfEntry;
 import org.briarproject.bramble.api.data.BdfList;
 import org.briarproject.bramble.api.data.BdfReader;
 import org.briarproject.bramble.api.data.BdfReaderFactory;
@@ -39,6 +41,7 @@ import java.util.Map.Entry;
 import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 
+import static org.briarproject.bramble.api.client.ContactGroupConstants.GROUP_KEY_CONTACT_ID;
 import static org.briarproject.bramble.api.identity.Author.FORMAT_VERSION;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_AUTHOR_NAME_LENGTH;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_PUBLIC_KEY_LENGTH;
@@ -389,4 +392,27 @@ class ClientHelperImpl implements ClientHelper {
 		return tpMap;
 	}
 
+	@Override
+	public ContactId getContactId(Transaction txn, GroupId contactGroupId)
+			throws DbException {
+		try {
+			BdfDictionary meta =
+					getGroupMetadataAsDictionary(txn, contactGroupId);
+			return new ContactId(meta.getLong(GROUP_KEY_CONTACT_ID).intValue());
+		} catch (FormatException e) {
+			throw new DbException(e); // Invalid group metadata
+		}
+	}
+
+	@Override
+	public void setContactId(Transaction txn, GroupId contactGroupId,
+			ContactId c) throws DbException {
+		BdfDictionary meta = BdfDictionary.of(
+				new BdfEntry(GROUP_KEY_CONTACT_ID, c.getInt()));
+		try {
+			mergeGroupMetadata(txn, contactGroupId, meta);
+		} catch (FormatException e) {
+			throw new AssertionError(e);
+		}
+	}
 }

bramble-core/src/main/java/org/briarproject/bramble/versioning/ClientVersioningConstants.java

@@ -5,6 +5,5 @@ interface ClientVersioningConstants {
 	// Metadata keys
 	String MSG_KEY_UPDATE_VERSION = "version";
 	String MSG_KEY_LOCAL = "local";
-	String GROUP_KEY_CONTACT_ID = "contactId";
 }
 

bramble-core/src/main/java/org/briarproject/bramble/versioning/ClientVersioningManagerImpl.java

@@ -50,7 +50,6 @@ import static java.util.Collections.emptyList;
 import static org.briarproject.bramble.api.sync.Group.Visibility.INVISIBLE;
 import static org.briarproject.bramble.api.sync.Group.Visibility.SHARED;
 import static org.briarproject.bramble.api.sync.Group.Visibility.VISIBLE;
-import static org.briarproject.bramble.versioning.ClientVersioningConstants.GROUP_KEY_CONTACT_ID;
 import static org.briarproject.bramble.versioning.ClientVersioningConstants.MSG_KEY_LOCAL;
 import static org.briarproject.bramble.versioning.ClientVersioningConstants.MSG_KEY_UPDATE_VERSION;
 
@@ -161,13 +160,7 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 		db.addGroup(txn, g);
 		db.setGroupVisibility(txn, c.getId(), g.getId(), SHARED);
 		// Attach the contact ID to the group
-		BdfDictionary meta = new BdfDictionary();
-		meta.put(GROUP_KEY_CONTACT_ID, c.getId().getInt());
-		try {
-			clientHelper.mergeGroupMetadata(txn, g.getId(), meta);
-		} catch (FormatException e) {
-			throw new AssertionError(e);
-		}
+		clientHelper.setContactId(txn, g.getId(), c.getId());
 		// Create and store the first local update
 		List<ClientVersion> versions = new ArrayList<>(clients);
 		Collections.sort(versions);
@@ -229,7 +222,7 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 			Map<ClientMajorVersion, Visibility> after =
 					getVisibilities(newLocalStates, newRemoteStates);
 			// Call hooks for any visibilities that have changed
-			ContactId c = getContactId(txn, m.getGroupId());
+			ContactId c = clientHelper.getContactId(txn, m.getGroupId());
 			if (!before.equals(after)) {
 				Contact contact = db.getContact(txn, c);
 				callVisibilityHooks(txn, contact, before, after);
@@ -521,17 +514,6 @@ class ClientVersioningManagerImpl implements ClientVersioningManager,
 		storeUpdate(txn, g, states, 1);
 	}
 
-	private ContactId getContactId(Transaction txn, GroupId g)
-			throws DbException {
-		try {
-			BdfDictionary meta =
-					clientHelper.getGroupMetadataAsDictionary(txn, g);
-			return new ContactId(meta.getLong(GROUP_KEY_CONTACT_ID).intValue());
-		} catch (FormatException e) {
-			throw new DbException(e);
-		}
-	}
-
 	private List<ClientState> updateStatesFromRemoteStates(
 			List<ClientState> oldLocalStates, List<ClientState> remoteStates) {
 		Set<ClientMajorVersion> remoteSet = new HashSet<>();

bramble-core/src/test/java/org/briarproject/bramble/versioning/ClientVersioningManagerImplTest.java

@@ -38,7 +38,6 @@ import static org.briarproject.bramble.test.TestUtils.getContact;
 import static org.briarproject.bramble.test.TestUtils.getGroup;
 import static org.briarproject.bramble.test.TestUtils.getMessage;
 import static org.briarproject.bramble.test.TestUtils.getRandomId;
-import static org.briarproject.bramble.versioning.ClientVersioningConstants.GROUP_KEY_CONTACT_ID;
 import static org.briarproject.bramble.versioning.ClientVersioningConstants.MSG_KEY_LOCAL;
 import static org.briarproject.bramble.versioning.ClientVersioningConstants.MSG_KEY_UPDATE_VERSION;
 import static org.junit.Assert.assertEquals;
@@ -60,8 +59,6 @@ public class ClientVersioningManagerImplTest extends BrambleMockTestCase {
 	private final ClientId clientId = getClientId();
 	private final long now = System.currentTimeMillis();
 	private final Transaction txn = new Transaction(null, false);
-	private final BdfDictionary groupMeta = BdfDictionary.of(
-			new BdfEntry(GROUP_KEY_CONTACT_ID, contact.getId().getInt()));
 
 	private ClientVersioningManagerImpl createInstance() {
 		context.checking(new Expectations() {{
@@ -123,8 +120,8 @@ public class ClientVersioningManagerImplTest extends BrambleMockTestCase {
 			oneOf(db).addGroup(txn, contactGroup);
 			oneOf(db).setGroupVisibility(txn, contact.getId(),
 					contactGroup.getId(), SHARED);
-			oneOf(clientHelper).mergeGroupMetadata(txn, contactGroup.getId(),
-					groupMeta);
+			oneOf(clientHelper).setContactId(txn, contactGroup.getId(),
+					contact.getId());
 			oneOf(clock).currentTimeMillis();
 			will(returnValue(now));
 			oneOf(clientHelper).createMessage(contactGroup.getId(), now,
@@ -460,9 +457,8 @@ public class ClientVersioningManagerImplTest extends BrambleMockTestCase {
 			oneOf(db).deleteMessage(txn, oldRemoteUpdateId);
 			oneOf(db).deleteMessageMetadata(txn, oldRemoteUpdateId);
 			// Get contact ID
-			oneOf(clientHelper).getGroupMetadataAsDictionary(txn,
-					contactGroup.getId());
-			will(returnValue(groupMeta));
+			oneOf(clientHelper).getContactId(txn, contactGroup.getId());
+			will(returnValue(contact.getId()));
 			// No states or visibilities have changed
 		}});
 
@@ -492,10 +488,9 @@ public class ClientVersioningManagerImplTest extends BrambleMockTestCase {
 			// Load the latest local update
 			oneOf(clientHelper).getMessageAsList(txn, oldLocalUpdateId);
 			will(returnValue(oldLocalUpdateBody));
-			// Get client ID
-			oneOf(clientHelper).getGroupMetadataAsDictionary(txn,
-					contactGroup.getId());
-			will(returnValue(groupMeta));
+			// Get contact ID
+			oneOf(clientHelper).getContactId(txn, contactGroup.getId());
+			will(returnValue(contact.getId()));
 			// No states or visibilities have changed
 		}});
 
@@ -546,8 +541,6 @@ public class ClientVersioningManagerImplTest extends BrambleMockTestCase {
 		BdfDictionary newLocalUpdateMeta = BdfDictionary.of(
 				new BdfEntry(MSG_KEY_UPDATE_VERSION, 2L),
 				new BdfEntry(MSG_KEY_LOCAL, true));
-		BdfDictionary groupMeta = BdfDictionary.of(
-				new BdfEntry(GROUP_KEY_CONTACT_ID, contact.getId().getInt()));
 
 		context.checking(new Expectations() {{
 			oneOf(clientHelper).toList(newRemoteUpdate);
@@ -577,9 +570,8 @@ public class ClientVersioningManagerImplTest extends BrambleMockTestCase {
 			oneOf(clientHelper).addLocalMessage(txn, newLocalUpdate,
 					newLocalUpdateMeta, true, false);
 			// The client's visibility has changed
-			oneOf(clientHelper).getGroupMetadataAsDictionary(txn,
-					contactGroup.getId());
-			will(returnValue(groupMeta));
+			oneOf(clientHelper).getContactId(txn, contactGroup.getId());
+			will(returnValue(contact.getId()));
 			oneOf(db).getContact(txn, contact.getId());
 			will(returnValue(contact));
 			oneOf(hook).onClientVisibilityChanging(txn, contact, visibility);
@@ -619,8 +611,6 @@ public class ClientVersioningManagerImplTest extends BrambleMockTestCase {
 		BdfDictionary newLocalUpdateMeta = BdfDictionary.of(
 				new BdfEntry(MSG_KEY_UPDATE_VERSION, 2L),
 				new BdfEntry(MSG_KEY_LOCAL, true));
-		BdfDictionary groupMeta = BdfDictionary.of(
-				new BdfEntry(GROUP_KEY_CONTACT_ID, contact.getId().getInt()));
 
 		context.checking(new Expectations() {{
 			oneOf(clientHelper).toList(newRemoteUpdate);
@@ -650,9 +640,8 @@ public class ClientVersioningManagerImplTest extends BrambleMockTestCase {
 			oneOf(clientHelper).addLocalMessage(txn, newLocalUpdate,
 					newLocalUpdateMeta, true, false);
 			// The client's visibility has changed
-			oneOf(clientHelper).getGroupMetadataAsDictionary(txn,
-					contactGroup.getId());
-			will(returnValue(groupMeta));
+			oneOf(clientHelper).getContactId(txn, contactGroup.getId());
+			will(returnValue(contact.getId()));
 			oneOf(db).getContact(txn, contact.getId());
 			will(returnValue(contact));
 			oneOf(hook).onClientVisibilityChanging(txn, contact, INVISIBLE);

bramble-java/build.gradle

@@ -16,7 +16,7 @@ dependencies {
 	implementation fileTree(dir: 'libs', include: '*.jar')
 	implementation 'net.java.dev.jna:jna:4.5.2'
 	implementation 'net.java.dev.jna:jna-platform:4.5.2'
-	tor 'org.briarproject:tor:0.3.5.10@zip'
+	tor 'org.briarproject:tor:0.3.5.12@zip'
 	tor 'org.briarproject:obfs4proxy:0.0.7@zip'
 
 	annotationProcessor 'com.google.dagger:dagger-compiler:2.24'

bramble-java/witness.gradle

@@ -24,7 +24,7 @@ dependencyVerification {
         '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:0.3.5.10:tor-0.3.5.10.zip:7b387d3523ae8af289c23be59dc4c64ec5d3721385d7825a09705095e3318d5c',
+        'org.briarproject:tor:0.3.5.12:tor-0.3.5.12.zip:2f542c4befd216f2226bf7c76e3b8b2d99af6f146a8cb28bf727f42014587006',
         '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:animal-sniffer-annotations:1.17:animal-sniffer-annotations-1.17.jar:92654f493ecfec52082e76354f0ebf87648dc3d5cec2e3c3cdb947c016747a53',

briar-android/build.gradle

@@ -93,12 +93,12 @@ dependencies {
 	implementation project(path: ':bramble-core', configuration: 'default')
 	implementation project(':bramble-android')
 
-	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 'androidx.recyclerview:recyclerview-selection:1.1.0-rc01'
+	implementation 'androidx.preference:preference:1.1.1'
+	implementation 'androidx.exifinterface:exifinterface:1.3.1'
+	implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
+	implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
+	implementation 'com.google.android.material:material:1.2.1'
+	implementation 'androidx.recyclerview:recyclerview-selection:1.1.0-rc03'
 
 	implementation 'ch.acra:acra:4.11'
 	implementation 'info.guardianproject.panic:panic:1.0'
@@ -106,7 +106,7 @@ dependencies {
 	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.vanniktech:emoji-google:0.6.0' // newer versions need minSdk 21
 	implementation 'com.github.kobakei:MaterialFabSpeedDial:1.2.1'
 	implementation 'com.github.chrisbanes:PhotoView:2.3.0'
 	def glideVersion = '4.10.0'
@@ -120,13 +120,13 @@ dependencies {
 
 	compileOnly 'javax.annotation:jsr250-api:1.0'
 
-	def espressoVersion = '3.2.0'
+	def espressoVersion = '3.3.0'
 	def jmockVersion = '2.8.2'
 	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
 	testImplementation project(path: ':bramble-core', configuration: 'testOutput')
-	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:runner:1.3.0'
+	testImplementation 'androidx.test.ext:junit:1.1.2'
+	testImplementation 'androidx.fragment:fragment-testing:1.2.5'
 	testImplementation "androidx.test.espresso:espresso-core:$espressoVersion"
 	testImplementation 'org.robolectric:robolectric:4.3.1'
 	testImplementation 'org.mockito:mockito-core:3.1.0'
@@ -136,7 +136,7 @@ dependencies {
 	testImplementation "org.jmock:jmock-legacy:$jmockVersion"
 
 	androidTestImplementation project(path: ':bramble-api', configuration: 'testOutput')
-	androidTestImplementation 'androidx.test.ext:junit:1.1.1'
+	androidTestImplementation 'androidx.test.ext:junit:1.1.2'
 	androidTestImplementation "androidx.test.espresso:espresso-core:$espressoVersion"
 	androidTestImplementation "androidx.test.espresso:espresso-contrib:$espressoVersion"
 	androidTestImplementation "androidx.test.espresso:espresso-intents:$espressoVersion"

briar-android/proguard-rules.txt

@@ -37,3 +37,6 @@
 
 # Glide
 -dontwarn com.bumptech.glide.load.engine.cache.DiskLruCacheWrapper
+
+# Dependency injection annotations, needed for UI tests on older API levels
+-keep class javax.inject.**

briar-android/src/main/AndroidManifest.xml

@@ -141,6 +141,16 @@
 				android:value="org.briarproject.briar.android.conversation.ConversationActivity" />
 		</activity>
 
+		<activity
+			android:name=".android.conversation.ConversationSettingsActivity"
+			android:parentActivityName="org.briarproject.briar.android.conversation.ConversationActivity"
+			android:label="@string/disappearing_messages_title"
+			android:theme="@style/BriarTheme">
+			<meta-data
+				android:name="android.support.PARENT_ACTIVITY"
+				android:value="org.briarproject.briar.android.conversation.ConversationActivity" />
+		</activity>
+
 		<activity
 			android:name="org.briarproject.briar.android.privategroup.creation.CreateGroupActivity"
 			android:label="@string/groups_create_group_title"

briar-android/src/main/java/org/briarproject/briar/android/AndroidComponent.java

@@ -14,6 +14,7 @@ import org.briarproject.bramble.api.contact.ContactManager;
 import org.briarproject.bramble.api.crypto.CryptoExecutor;
 import org.briarproject.bramble.api.crypto.PasswordStrengthEstimator;
 import org.briarproject.bramble.api.db.DatabaseExecutor;
+import org.briarproject.bramble.api.db.TransactionManager;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.identity.IdentityManager;
 import org.briarproject.bramble.api.keyagreement.KeyAgreementTask;
@@ -39,6 +40,7 @@ import org.briarproject.briar.api.android.AndroidNotificationManager;
 import org.briarproject.briar.api.android.DozeWatchdog;
 import org.briarproject.briar.api.android.LockManager;
 import org.briarproject.briar.api.android.ScreenFilterMonitor;
+import org.briarproject.briar.api.autodelete.AutoDeleteManager;
 import org.briarproject.briar.api.blog.BlogManager;
 import org.briarproject.briar.api.blog.BlogPostFactory;
 import org.briarproject.briar.api.blog.BlogSharingManager;
@@ -169,6 +171,10 @@ public interface AndroidComponent
 
 	AndroidWakeLockManager wakeLockManager();
 
+	TransactionManager transactionManager();
+
+	AutoDeleteManager autoDeleteManager();
+
 	void inject(SignInReminderReceiver briarService);
 
 	void inject(BriarService briarService);

briar-android/src/main/java/org/briarproject/briar/android/account/AuthorNameFragment.java

@@ -17,7 +17,6 @@ import org.briarproject.briar.android.activity.ActivityComponent;
 
 import javax.annotation.Nullable;
 
-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.toUtf8;
 import static org.briarproject.briar.android.util.UiUtils.setError;
@@ -45,7 +44,7 @@ public class AuthorNameFragment extends SetupFragment {
 	public View onCreateView(LayoutInflater inflater,
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
-		requireNonNull(getActivity()).setTitle(getString(R.string.setup_title));
+		requireActivity().setTitle(getString(R.string.setup_title));
 		View v = inflater.inflate(R.layout.fragment_setup_author_name,
 				container, false);
 		authorNameWrapper = v.findViewById(R.id.nickname_entry_wrapper);

briar-android/src/main/java/org/briarproject/briar/android/account/DozeFragment.java

@@ -20,7 +20,6 @@ import androidx.annotation.Nullable;
 
 import static android.view.View.INVISIBLE;
 import static android.view.View.VISIBLE;
-import static java.util.Objects.requireNonNull;
 import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_DOZE_WHITELISTING;
 import static org.briarproject.briar.android.util.UiUtils.showOnboardingDialog;
 
@@ -50,10 +49,10 @@ public class DozeFragment extends SetupFragment
 	public View onCreateView(LayoutInflater inflater,
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
-		requireNonNull(getActivity()).setTitle(getString(R.string.setup_doze_title));
+		requireActivity().setTitle(getString(R.string.setup_doze_title));
 		setHasOptionsMenu(false);
 		View v = inflater.inflate(R.layout.fragment_setup_doze, container,
-						false);
+				false);
 		dozeView = v.findViewById(R.id.dozeView);
 		dozeView.setOnCheckedChangedListener(this);
 		huaweiView = v.findViewById(R.id.huaweiView);
@@ -78,7 +77,8 @@ public class DozeFragment extends SetupFragment
 	}
 
 	@Override
-	public void onActivityResult(int request, int result, Intent data) {
+	public void onActivityResult(int request, int result,
+			@Nullable Intent data) {
 		super.onActivityResult(request, result, data);
 		if (request == REQUEST_DOZE_WHITELISTING) {
 			if (!dozeView.needsToBeShown() || secondAttempt) {
@@ -92,11 +92,7 @@ public class DozeFragment extends SetupFragment
 
 	@Override
 	public void onCheckedChanged() {
-		if (dozeView.isChecked() && huaweiView.isChecked()) {
-			next.setEnabled(true);
-		} else {
-			next.setEnabled(false);
-		}
+		next.setEnabled(dozeView.isChecked() && huaweiView.isChecked());
 	}
 
 	@SuppressLint("BatteryLife")

briar-android/src/main/java/org/briarproject/briar/android/account/SetPasswordFragment.java

@@ -24,7 +24,6 @@ import static android.content.Context.INPUT_METHOD_SERVICE;
 import static android.view.View.INVISIBLE;
 import static android.view.View.VISIBLE;
 import static android.view.inputmethod.EditorInfo.IME_ACTION_DONE;
-import static java.util.Objects.requireNonNull;
 import static org.briarproject.bramble.api.crypto.PasswordStrengthEstimator.QUITE_WEAK;
 import static org.briarproject.briar.android.util.UiUtils.setError;
 
@@ -55,7 +54,7 @@ public class SetPasswordFragment extends SetupFragment {
 	public View onCreateView(LayoutInflater inflater,
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
-		requireNonNull(getActivity()).setTitle(getString(R.string.setup_password_intro));
+		requireActivity().setTitle(getString(R.string.setup_password_intro));
 		View v = inflater.inflate(R.layout.fragment_setup_password, container,
 						false);
 

briar-android/src/main/java/org/briarproject/briar/android/activity/ActivityComponent.java

@@ -28,6 +28,8 @@ 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;
 import org.briarproject.briar.android.conversation.ConversationActivity;
+import org.briarproject.briar.android.conversation.ConversationSettingsActivity;
+import org.briarproject.briar.android.conversation.ConversationSettingsFragment;
 import org.briarproject.briar.android.conversation.ImageActivity;
 import org.briarproject.briar.android.conversation.ImageFragment;
 import org.briarproject.briar.android.forum.CreateForumActivity;
@@ -184,6 +186,8 @@ public interface ActivityComponent {
 
 	void inject(PendingContactListActivity activity);
 
+	void inject(ConversationSettingsActivity activity);
+
 	// Fragments
 
 	void inject(AuthorNameFragment fragment);
@@ -234,4 +238,6 @@ public interface ActivityComponent {
 
 	void inject(ImageFragment imageFragment);
 
+	void inject(ConversationSettingsFragment conversationSettingsFragment);
+
 }

briar-android/src/main/java/org/briarproject/briar/android/blog/BasePostFragment.java

@@ -25,7 +25,6 @@ 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;
-import static java.util.Objects.requireNonNull;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 import static org.briarproject.briar.android.util.UiUtils.MIN_DATE_RESOLUTION;
@@ -55,7 +54,7 @@ abstract class BasePostFragment extends BaseFragment {
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
 		// retrieve MessageId of blog post from arguments
-		byte[] p = requireNonNull(getArguments()).getByteArray(POST_ID);
+		byte[] p = requireArguments().getByteArray(POST_ID);
 		if (p == null) throw new IllegalStateException("No post ID in args");
 		postId = new MessageId(p);
 

briar-android/src/main/java/org/briarproject/briar/android/blog/BlogFragment.java

@@ -46,7 +46,6 @@ import static android.app.Activity.RESULT_OK;
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 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;
 import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_WRITE_BLOG_POST;
@@ -97,14 +96,14 @@ public class BlogFragment extends BaseFragment
 	public View onCreateView(LayoutInflater inflater,
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
-		Bundle args = requireNonNull(getArguments());
+		Bundle args = requireArguments();
 		byte[] b = args.getByteArray(GROUP_ID);
 		if (b == null) throw new IllegalStateException("No group ID in args");
 		groupId = new GroupId(b);
 
 		View v = inflater.inflate(R.layout.fragment_blog, container, false);
 
-		adapter = new BlogPostAdapter(requireNonNull(getActivity()), this,
+		adapter = new BlogPostAdapter(requireActivity(), this,
 				getFragmentManager());
 		list = v.findViewById(R.id.postList);
 		layoutManager = new LinearLayoutManager(getActivity());
@@ -196,7 +195,8 @@ public class BlogFragment extends BaseFragment
 	}
 
 	@Override
-	public void onActivityResult(int request, int result, Intent data) {
+	public void onActivityResult(int request, int result,
+			@Nullable Intent data) {
 		super.onActivityResult(request, result, data);
 
 		if (request == REQUEST_WRITE_BLOG_POST && result == RESULT_OK) {

briar-android/src/main/java/org/briarproject/briar/android/blog/FeedFragment.java

@@ -35,7 +35,6 @@ import androidx.recyclerview.widget.LinearLayoutManager;
 import static android.app.Activity.RESULT_OK;
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 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;
 
@@ -79,7 +78,7 @@ public class FeedFragment extends BaseFragment implements
 	public View onCreateView(LayoutInflater inflater,
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
-		requireNonNull(getActivity()).setTitle(R.string.blogs_button);
+		requireActivity().setTitle(R.string.blogs_button);
 
 		View v = inflater.inflate(R.layout.fragment_blog, container, false);
 
@@ -103,7 +102,8 @@ public class FeedFragment extends BaseFragment implements
 	}
 
 	@Override
-	public void onActivityResult(int requestCode, int resultCode, Intent data) {
+	public void onActivityResult(int requestCode, int resultCode,
+			@Nullable Intent data) {
 		super.onActivityResult(requestCode, resultCode, data);
 
 		// The BlogPostAddedEvent arrives when the controller is not listening

briar-android/src/main/java/org/briarproject/briar/android/blog/FeedPostFragment.java

@@ -18,7 +18,6 @@ import javax.inject.Inject;
 
 import androidx.annotation.UiThread;
 
-import static java.util.Objects.requireNonNull;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 
 @UiThread
@@ -54,7 +53,7 @@ public class FeedPostFragment extends BasePostFragment {
 	public View onCreateView(LayoutInflater inflater,
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
-		Bundle args = requireNonNull(getArguments());
+		Bundle args = requireArguments();
 		byte[] b = args.getByteArray(GROUP_ID);
 		if (b == null) throw new IllegalStateException("No group ID in args");
 		blogId = new GroupId(b);

briar-android/src/main/java/org/briarproject/briar/android/blog/ReblogFragment.java

@@ -74,7 +74,7 @@ public class ReblogFragment extends BaseFragment implements SendListener {
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
 
-		Bundle args = requireNonNull(getArguments());
+		Bundle args = requireArguments();
 		GroupId blogId =
 				new GroupId(requireNonNull(args.getByteArray(GROUP_ID)));
 		MessageId postId =

briar-android/src/main/java/org/briarproject/briar/android/contact/ContactListFragment.java

@@ -62,7 +62,6 @@ import static android.os.Build.VERSION.SDK_INT;
 import static androidx.core.app.ActivityOptionsCompat.makeSceneTransitionAnimation;
 import static androidx.core.view.ViewCompat.getTransitionName;
 import static com.google.android.material.snackbar.BaseTransientBottomBar.LENGTH_INDEFINITE;
-import static java.util.Objects.requireNonNull;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
 import static org.briarproject.bramble.util.LogUtils.logException;
@@ -122,7 +121,7 @@ public class ContactListFragment extends BaseFragment implements EventListener,
 	public View onCreateView(LayoutInflater inflater,
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
-		requireNonNull(getActivity()).setTitle(R.string.contact_list_button);
+		requireActivity().setTitle(R.string.contact_list_button);
 
 		View contentView = inflater.inflate(R.layout.fragment_contact_list,
 				container, false);
@@ -274,8 +273,8 @@ public class ContactListFragment extends BaseFragment implements EventListener,
 			removeItem(((ContactRemovedEvent) e).getContactId());
 		} else if (e instanceof ConversationMessageReceivedEvent) {
 			LOG.info("Conversation message received, updating item");
-			ConversationMessageReceivedEvent p =
-					(ConversationMessageReceivedEvent) e;
+			ConversationMessageReceivedEvent<?> p =
+					(ConversationMessageReceivedEvent<?>) e;
 			ConversationMessageHeader h = p.getMessageHeader();
 			updateItem(p.getContactId(), h);
 		} else if (e instanceof PendingContactAddedEvent ||
@@ -317,7 +316,7 @@ public class ContactListFragment extends BaseFragment implements EventListener,
 	@UiThread
 	private void showSnackBar() {
 		if (snackbar != null) return;
-		View v = requireNonNull(getView());
+		View v = requireView();
 		int stringRes = R.string.pending_contact_requests_snackbar;
 		snackbar = new BriarSnackbarBuilder()
 				.setAction(R.string.show, view -> showPendingContactList())

briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/LinkExchangeFragment.java

@@ -33,7 +33,6 @@ import androidx.lifecycle.ViewModelProviders;
 
 import static android.content.Context.CLIPBOARD_SERVICE;
 import static android.widget.Toast.LENGTH_SHORT;
-import static java.util.Objects.requireNonNull;
 import static org.briarproject.bramble.api.contact.HandshakeLinkConstants.LINK_REGEX;
 import static org.briarproject.briar.android.util.UiUtils.observeOnce;
 
@@ -83,8 +82,8 @@ public class LinkExchangeFragment extends BaseFragment
 			linkInput.setText(viewModel.getRemoteHandshakeLink());
 		}
 
-		clipboard = (ClipboardManager) requireNonNull(
-				getContext().getSystemService(CLIPBOARD_SERVICE));
+		clipboard = (ClipboardManager)
+				requireContext().getSystemService(CLIPBOARD_SERVICE);
 
 		Button pasteButton = v.findViewById(R.id.pasteButton);
 		pasteButton.setOnClickListener(view -> {
@@ -107,7 +106,7 @@ public class LinkExchangeFragment extends BaseFragment
 
 	@Override
 	public void onGlobalLayout() {
-		ScrollView scrollView = (ScrollView) requireNonNull(getView());
+		ScrollView scrollView = (ScrollView) requireView();
 		View layout = scrollView.getChildAt(0);
 		int scrollBy = layout.getHeight() - scrollView.getHeight();
 		if (scrollBy > 0) {
@@ -121,7 +120,7 @@ public class LinkExchangeFragment extends BaseFragment
 	}
 
 	private void onHandshakeLinkLoaded(String link) {
-		View v = requireNonNull(getView());
+		View v = requireView();
 
 		TextView linkView = v.findViewById(R.id.linkView);
 		linkView.setText(link);

briar-android/src/main/java/org/briarproject/briar/android/contact/add/remote/NicknameFragment.java

@@ -31,6 +31,7 @@ import javax.inject.Inject;
 
 import androidx.annotation.StringRes;
 import androidx.appcompat.app.AlertDialog.Builder;
+import androidx.lifecycle.LifecycleOwner;
 import androidx.lifecycle.ViewModelProvider;
 import androidx.lifecycle.ViewModelProviders;
 
@@ -117,7 +118,8 @@ public class NicknameFragment extends BaseFragment {
 		addButton.setVisibility(INVISIBLE);
 		progressBar.setVisibility(VISIBLE);
 
-		viewModel.getAddContactResult().observe(this, result -> {
+		LifecycleOwner owner = getViewLifecycleOwner();
+		viewModel.getAddContactResult().observe(owner, result -> {
 			if (result == null) return;
 			if (result.hasError())
 				handleException(name, requireNonNull(result.getException()));

briar-android/src/main/java/org/briarproject/briar/android/contactselection/BaseContactSelectorFragment.java

@@ -26,7 +26,6 @@ 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;
 import static org.briarproject.briar.android.contactselection.ContactSelectorActivity.getContactsFromIds;
@@ -55,7 +54,7 @@ public abstract class BaseContactSelectorFragment<I extends SelectableContactIte
 	public void onCreate(@Nullable Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 
-		Bundle args = requireNonNull(getArguments());
+		Bundle args = requireArguments();
 		byte[] b = args.getByteArray(GROUP_ID);
 		if (b == null) throw new IllegalStateException("No GroupId");
 		groupId = new GroupId(b);
@@ -74,7 +73,7 @@ public abstract class BaseContactSelectorFragment<I extends SelectableContactIte
 		list.setEmptyImage(R.drawable.ic_empty_state_contact_list);
 		list.setEmptyText(getString(R.string.no_contacts_selector));
 		list.setEmptyAction(getString(R.string.no_contacts_selector_action));
-		adapter = getAdapter(requireNonNull(getContext()), this);
+		adapter = getAdapter(requireContext(), this);
 		list.setAdapter(adapter);
 
 		// restore selected contacts if available

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationActivity.java

@@ -140,6 +140,8 @@ import static org.briarproject.briar.android.util.UiUtils.getBulbTransitionName;
 import static org.briarproject.briar.android.util.UiUtils.observeOnce;
 import static org.briarproject.briar.api.messaging.MessagingConstants.MAX_ATTACHMENTS_PER_MESSAGE;
 import static org.briarproject.briar.api.messaging.MessagingConstants.MAX_PRIVATE_MESSAGE_TEXT_LENGTH;
+import static org.briarproject.briar.api.messaging.PrivateMessageFormat.TEXT_IMAGES_AUTO_DELETE;
+import static org.briarproject.briar.api.messaging.PrivateMessageFormat.TEXT_ONLY;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -273,15 +275,11 @@ public class ConversationActivity extends BriarActivity
 			ImagePreview imagePreview = findViewById(R.id.imagePreview);
 			sendController = new TextAttachmentController(textInputView,
 					imagePreview, this, viewModel);
-			viewModel.hasImageSupport().observe(this, new Observer<Boolean>() {
-				@Override
-				public void onChanged(@Nullable Boolean hasSupport) {
-					if (hasSupport != null && hasSupport) {
-						// TODO: remove cast when removing feature flag
-						((TextAttachmentController) sendController)
-								.setImagesSupported();
-						viewModel.hasImageSupport().removeObserver(this);
-					}
+			observeOnce(viewModel.getPrivateMessageFormat(), this, format -> {
+				if (format != TEXT_ONLY) {
+					// TODO: remove cast when removing feature flag
+					((TextAttachmentController) sendController)
+							.setImagesSupported();
 				}
 			});
 		} else {
@@ -384,6 +382,12 @@ public class ConversationActivity extends BriarActivity
 		// enable alias action if available
 		observeOnce(viewModel.getContact(), this, contact ->
 				menu.findItem(R.id.action_set_alias).setEnabled(true));
+		// show auto-delete timer setting only, if contacts supports it
+		observeOnce(viewModel.getPrivateMessageFormat(), this, format -> {
+			boolean visible = format == TEXT_IMAGES_AUTO_DELETE;
+			menu.findItem(R.id.action_conversation_settings)
+					.setVisible(visible);
+		});
 
 		return super.onCreateOptionsMenu(menu);
 	}
@@ -405,6 +409,12 @@ public class ConversationActivity extends BriarActivity
 				AliasDialogFragment.newInstance().show(
 						getSupportFragmentManager(), AliasDialogFragment.TAG);
 				return true;
+			case R.id.action_conversation_settings:
+				if (contactId == null) return false;
+				intent = new Intent(this, ConversationSettingsActivity.class);
+				intent.putExtra(CONTACT_ID, contactId.getInt());
+				startActivity(intent);
+				return true;
 			case R.id.action_delete_all_messages:
 				askToDeleteAllMessages();
 				return true;
@@ -657,8 +667,8 @@ public class ConversationActivity extends BriarActivity
 				supportFinishAfterTransition();
 			}
 		} else if (e instanceof ConversationMessageReceivedEvent) {
-			ConversationMessageReceivedEvent p =
-					(ConversationMessageReceivedEvent) e;
+			ConversationMessageReceivedEvent<?> p =
+					(ConversationMessageReceivedEvent<?>) e;
 			if (p.getContactId().equals(contactId)) {
 				LOG.info("Message received, adding");
 				onNewConversationMessage(p.getMessageHeader());
@@ -756,18 +766,10 @@ public class ConversationActivity extends BriarActivity
 			List<AttachmentHeader> attachmentHeaders) {
 		if (isNullOrEmpty(text) && attachmentHeaders.isEmpty())
 			throw new AssertionError();
-		long timestamp = System.currentTimeMillis();
-		timestamp = Math.max(timestamp, getMinTimestampForNewMessage());
-		viewModel.sendMessage(text, attachmentHeaders, timestamp);
+		viewModel.sendMessage(text, attachmentHeaders);
 		textInputView.clearText();
 	}
 
-	private long getMinTimestampForNewMessage() {
-		// Don't use an earlier timestamp than the newest message
-		ConversationItem item = adapter.getLastItem();
-		return item == null ? 0 : item.getTime() + 1;
-	}
-
 	private void onAddedPrivateMessage(@Nullable PrivateMessageHeader h) {
 		if (h == null) return;
 		addConversationItem(h.accept(visitor));
@@ -972,13 +974,11 @@ public class ConversationActivity extends BriarActivity
 			adapter.notifyItemChanged(position, item);
 		}
 		runOnDbThread(() -> {
-			long timestamp = System.currentTimeMillis();
-			timestamp = Math.max(timestamp, getMinTimestampForNewMessage());
 			try {
 				switch (item.getRequestType()) {
 					case INTRODUCTION:
 						respondToIntroductionRequest(item.getSessionId(),
-								accept, timestamp);
+								accept);
 						break;
 					case FORUM:
 						respondToForumRequest(item.getSessionId(), accept);
@@ -1054,9 +1054,8 @@ public class ConversationActivity extends BriarActivity
 
 	@DatabaseExecutor
 	private void respondToIntroductionRequest(SessionId sessionId,
-			boolean accept, long time) throws DbException {
-		introductionManager.respondToIntroduction(contactId, sessionId, time,
-				accept);
+			boolean accept) throws DbException {
+		introductionManager.respondToIntroduction(contactId, sessionId, accept);
 	}
 
 	@DatabaseExecutor

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationItem.java

@@ -22,7 +22,7 @@ abstract class ConversationItem {
 	protected String text;
 	private final MessageId id;
 	private final GroupId groupId;
-	private final long time;
+	private final long time, autoDeleteTimer;
 	private final boolean isIncoming;
 	private boolean read, sent, seen;
 
@@ -32,6 +32,7 @@ abstract class ConversationItem {
 		this.id = h.getId();
 		this.groupId = h.getGroupId();
 		this.time = h.getTimestamp();
+		this.autoDeleteTimer = h.getAutoDeleteTimer();
 		this.read = h.isRead();
 		this.sent = h.isSent();
 		this.seen = h.isSeen();
@@ -68,6 +69,10 @@ abstract class ConversationItem {
 		return time;
 	}
 
+	public long getAutoDeleteTimer() {
+		return autoDeleteTimer;
+	}
+
 	/**
 	 * Only useful for incoming messages.
 	 */

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationItemViewHolder.java

@@ -12,8 +12,11 @@ import androidx.annotation.UiThread;
 import androidx.constraintlayout.widget.ConstraintLayout;
 import androidx.recyclerview.widget.RecyclerView.ViewHolder;
 
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
 import static org.briarproject.bramble.util.StringUtils.trim;
 import static org.briarproject.briar.android.util.UiUtils.formatDate;
+import static org.briarproject.briar.api.autodelete.AutoDeleteConstants.NO_AUTO_DELETE_TIMER;
 
 @UiThread
 @NotNullByDefault
@@ -26,6 +29,7 @@ abstract class ConversationItemViewHolder extends ViewHolder {
 	private final OutItemViewHolder outViewHolder;
 	private final TextView text;
 	protected final TextView time;
+	private final View bomb;
 	@Nullable
 	private String itemKey = null;
 
@@ -38,6 +42,7 @@ abstract class ConversationItemViewHolder extends ViewHolder {
 		layout = v.findViewById(R.id.layout);
 		text = v.findViewById(R.id.text);
 		time = v.findViewById(R.id.time);
+		bomb = v.findViewById(R.id.bomb);
 	}
 
 	@CallSuper
@@ -52,6 +57,9 @@ abstract class ConversationItemViewHolder extends ViewHolder {
 		long timestamp = item.getTime();
 		time.setText(formatDate(time.getContext(), timestamp));
 
+		boolean showBomb = item.getAutoDeleteTimer() != NO_AUTO_DELETE_TIMER;
+		bomb.setVisibility(showBomb ? VISIBLE : GONE);
+
 		if (outViewHolder != null) outViewHolder.bind(item);
 	}
 

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationSettingsActivity.java

@@ -0,0 +1,80 @@
+package org.briarproject.briar.android.conversation;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.MenuItem;
+
+import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
+import org.briarproject.briar.R;
+import org.briarproject.briar.android.activity.ActivityComponent;
+import org.briarproject.briar.android.activity.BriarActivity;
+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 org.briarproject.briar.android.conversation.ConversationActivity.CONTACT_ID;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+public class ConversationSettingsActivity extends BriarActivity implements
+		BaseFragmentListener {
+
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+
+	private ConversationViewModel viewModel;
+	private ContactId contactId;
+
+	@Override
+	public void onCreate(@Nullable Bundle bundle) {
+		super.onCreate(bundle);
+
+		Intent i = getIntent();
+		int id = i.getIntExtra(CONTACT_ID, -1);
+		if (id == -1) throw new IllegalStateException();
+		contactId = new ContactId(id);
+
+		ActionBar actionBar = getSupportActionBar();
+		if (actionBar != null) {
+			actionBar.setHomeButtonEnabled(true);
+			actionBar.setDisplayHomeAsUpEnabled(true);
+		}
+
+		setContentView(R.layout.activity_conversation_settings);
+
+		viewModel = ViewModelProviders.of(this, viewModelFactory)
+				.get(ConversationViewModel.class);
+	}
+
+	@Override
+	public void onResume() {
+		super.onResume();
+		// Trigger loading of contact data, noop if data was loaded already.
+		//
+		// We can only start loading data *after* we are sure
+		// the user has signed in. After sign-in, onCreate() isn't run again.
+		if (signedIn()) viewModel.setContactId(contactId);
+	}
+
+	@Override
+	public void injectActivity(ActivityComponent component) {
+		component.inject(this);
+	}
+
+	@Override
+	public boolean onOptionsItemSelected(MenuItem item) {
+		if (item.getItemId() == android.R.id.home) {
+			onBackPressed();
+			return true;
+		}
+		return false;
+	}
+
+}

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationSettingsFragment.java

@@ -0,0 +1,158 @@
+package org.briarproject.briar.android.conversation;
+
+import android.content.Context;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import org.briarproject.bramble.api.db.DatabaseExecutor;
+import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.bramble.api.db.TransactionManager;
+import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
+import org.briarproject.briar.R;
+import org.briarproject.briar.android.fragment.BaseFragment;
+import org.briarproject.briar.api.autodelete.AutoDeleteManager;
+
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.annotation.Nullable;
+import javax.inject.Inject;
+
+import androidx.appcompat.widget.SwitchCompat;
+import androidx.lifecycle.ViewModelProvider;
+import androidx.lifecycle.ViewModelProviders;
+
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
+import static org.briarproject.briar.android.util.UiUtils.observeOnce;
+import static org.briarproject.briar.api.autodelete.AutoDeleteConstants.NO_AUTO_DELETE_TIMER;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+public class ConversationSettingsFragment extends BaseFragment {
+
+	public static final String TAG =
+			ConversationSettingsFragment.class.getName();
+
+	private static final Logger LOG =
+			Logger.getLogger(ConversationSettingsFragment.class.getName());
+
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+	@Inject
+	@DatabaseExecutor
+	Executor dbExecutor;
+	@Inject
+	TransactionManager db;
+	@Inject
+	AutoDeleteManager autoDeleteManager;
+
+	private ConversationSettingsActivity listener;
+	private ConversationViewModel viewModel;
+	private SwitchCompat switchDisappearingMessages;
+	private volatile boolean disappearingMessages = false;
+
+	@Override
+	public String getUniqueTag() {
+		return TAG;
+	}
+
+	@Override
+	public void onAttach(Context context) {
+		super.onAttach(context);
+		listener = (ConversationSettingsActivity) context;
+		listener.getActivityComponent().inject(this);
+	}
+
+	@Override
+	public void onCreate(@Nullable Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+		setHasOptionsMenu(true);
+	}
+
+	@Override
+	public View onCreateView(LayoutInflater inflater,
+			@Nullable ViewGroup container,
+			@Nullable Bundle savedInstanceState) {
+		View contentView =
+				inflater.inflate(R.layout.fragment_conversation_settings,
+						container, false);
+
+		switchDisappearingMessages =
+				contentView.findViewById(R.id.switchDisappearingMessages);
+
+		switchDisappearingMessages
+				.setOnCheckedChangeListener((button, value) -> viewModel
+						.setAutoDeleteTimerEnabled(value));
+
+		TextView buttonLearnMore =
+				contentView.findViewById(R.id.buttonLearnMore);
+		buttonLearnMore.setOnClickListener(e -> showLearnMoreDialog());
+
+		viewModel = ViewModelProviders.of(requireActivity(), viewModelFactory)
+				.get(ConversationViewModel.class);
+
+		return contentView;
+	}
+
+	@Override
+	public void onStart() {
+		super.onStart();
+		switchDisappearingMessages.setEnabled(false);
+		loadSettings();
+	}
+
+	private void loadSettings() {
+		observeOnce(viewModel.getContact(), this, c -> {
+			dbExecutor.execute(() -> {
+				try {
+					db.transaction(false, txn -> {
+						long timer = autoDeleteManager
+								.getAutoDeleteTimer(txn, c.getId());
+						disappearingMessages = timer != NO_AUTO_DELETE_TIMER;
+					});
+					listener.runOnUiThreadUnlessDestroyed(
+							this::displaySettings);
+				} catch (DbException e) {
+					logException(LOG, WARNING, e);
+				}
+			});
+		});
+	}
+
+	private void displaySettings() {
+		switchDisappearingMessages.setChecked(disappearingMessages);
+		switchDisappearingMessages.setEnabled(true);
+	}
+
+	@Override
+	public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+		inflater.inflate(R.menu.help_action, menu);
+		super.onCreateOptionsMenu(menu, inflater);
+	}
+
+
+	@Override
+	public boolean onOptionsItemSelected(MenuItem item) {
+		if (item.getItemId() == R.id.action_help) {
+			showLearnMoreDialog();
+			return true;
+		}
+		return super.onOptionsItemSelected(item);
+	}
+
+	private void showLearnMoreDialog() {
+		ConversationSettingsLearnMoreDialog
+				dialog = new ConversationSettingsLearnMoreDialog();
+		dialog.show(requireActivity().getSupportFragmentManager(),
+				ConversationSettingsLearnMoreDialog.TAG);
+	}
+
+}

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationSettingsLearnMoreDialog.java

@@ -0,0 +1,44 @@
+package org.briarproject.briar.android.conversation;
+
+import android.app.Dialog;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+
+import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.briar.R;
+
+import androidx.appcompat.app.AlertDialog;
+import androidx.fragment.app.DialogFragment;
+import androidx.fragment.app.FragmentActivity;
+
+@MethodsNotNullByDefault
+public class ConversationSettingsLearnMoreDialog extends DialogFragment {
+
+	final static String TAG =
+			ConversationSettingsLearnMoreDialog.class.getName();
+
+	static ConversationSettingsLearnMoreDialog newInstance() {
+		return new ConversationSettingsLearnMoreDialog();
+	}
+
+	@Override
+	public Dialog onCreateDialog(Bundle savedInstanceState) {
+		FragmentActivity activity = requireActivity();
+
+		AlertDialog.Builder builder =
+				new AlertDialog.Builder(activity, R.style.BriarDialogTheme);
+
+		LayoutInflater inflater = LayoutInflater.from(getContext());
+		View view = inflater.inflate(
+				R.layout.fragment_conversation_settings_learn_more, null);
+		builder.setView(view);
+
+		builder.setTitle(R.string.disappearing_messages_title);
+		builder.setNeutralButton(R.string.ok, null);
+
+		return builder.create();
+	}
+
+
+}

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationViewModel.java

@@ -10,6 +10,7 @@ import org.briarproject.bramble.api.contact.ContactManager;
 import org.briarproject.bramble.api.db.DatabaseExecutor;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.NoSuchContactException;
+import org.briarproject.bramble.api.db.Transaction;
 import org.briarproject.bramble.api.db.TransactionManager;
 import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.event.EventBus;
@@ -28,10 +29,13 @@ import org.briarproject.briar.android.attachment.AttachmentRetriever;
 import org.briarproject.briar.android.util.UiUtils;
 import org.briarproject.briar.android.viewmodel.LiveEvent;
 import org.briarproject.briar.android.viewmodel.MutableLiveEvent;
+import org.briarproject.briar.api.autodelete.AutoDeleteManager;
+import org.briarproject.briar.api.conversation.ConversationManager;
 import org.briarproject.briar.api.messaging.AttachmentHeader;
 import org.briarproject.briar.api.messaging.MessagingManager;
 import org.briarproject.briar.api.messaging.PrivateMessage;
 import org.briarproject.briar.api.messaging.PrivateMessageFactory;
+import org.briarproject.briar.api.messaging.PrivateMessageFormat;
 import org.briarproject.briar.api.messaging.PrivateMessageHeader;
 import org.briarproject.briar.api.messaging.event.AttachmentReceivedEvent;
 
@@ -50,6 +54,7 @@ import androidx.lifecycle.MutableLiveData;
 import androidx.lifecycle.Transformations;
 
 import static java.util.Objects.requireNonNull;
+import static java.util.concurrent.TimeUnit.DAYS;
 import static java.util.logging.Level.WARNING;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
@@ -57,12 +62,15 @@ import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.LogUtils.now;
 import static org.briarproject.briar.android.settings.SettingsFragment.SETTINGS_NAMESPACE;
 import static org.briarproject.briar.android.util.UiUtils.observeForeverOnce;
+import static org.briarproject.briar.api.autodelete.AutoDeleteConstants.NO_AUTO_DELETE_TIMER;
+import static org.briarproject.briar.api.messaging.PrivateMessageFormat.TEXT_IMAGES;
+import static org.briarproject.briar.api.messaging.PrivateMessageFormat.TEXT_ONLY;
 
 @NotNullByDefault
 public class ConversationViewModel extends AndroidViewModel
 		implements EventListener, AttachmentManager {
 
-	private static Logger LOG =
+	private static final Logger LOG =
 			getLogger(ConversationViewModel.class.getName());
 
 	private static final String SHOW_ONBOARDING_IMAGE =
@@ -80,6 +88,8 @@ public class ConversationViewModel extends AndroidViewModel
 	private final PrivateMessageFactory privateMessageFactory;
 	private final AttachmentRetriever attachmentRetriever;
 	private final AttachmentCreator attachmentCreator;
+	private final AutoDeleteManager autoDeleteManager;
+	private final ConversationManager conversationManager;
 
 	@Nullable
 	private ContactId contactId = null;
@@ -89,7 +99,7 @@ public class ConversationViewModel extends AndroidViewModel
 	private final LiveData<String> contactName =
 			Transformations.map(contact, UiUtils::getContactDisplayName);
 	private final LiveData<GroupId> messagingGroupId;
-	private final MutableLiveData<Boolean> imageSupport =
+	private final MutableLiveData<PrivateMessageFormat> privateMessageFormat =
 			new MutableLiveData<>();
 	private final MutableLiveEvent<Boolean> showImageOnboarding =
 			new MutableLiveEvent<>();
@@ -112,7 +122,9 @@ public class ConversationViewModel extends AndroidViewModel
 			SettingsManager settingsManager,
 			PrivateMessageFactory privateMessageFactory,
 			AttachmentRetriever attachmentRetriever,
-			AttachmentCreator attachmentCreator) {
+			AttachmentCreator attachmentCreator,
+			AutoDeleteManager autoDeleteManager,
+			ConversationManager conversationManager) {
 		super(application);
 		this.dbExecutor = dbExecutor;
 		this.db = db;
@@ -123,6 +135,8 @@ public class ConversationViewModel extends AndroidViewModel
 		this.privateMessageFactory = privateMessageFactory;
 		this.attachmentRetriever = attachmentRetriever;
 		this.attachmentCreator = attachmentCreator;
+		this.autoDeleteManager = autoDeleteManager;
+		this.conversationManager = conversationManager;
 		messagingGroupId = Transformations
 				.map(contact, c -> messagingManager.getContactGroup(c).getId());
 		contactDeleted.setValue(false);
@@ -205,16 +219,13 @@ public class ConversationViewModel extends AndroidViewModel
 	}
 
 	@UiThread
-	void sendMessage(@Nullable String text,
-			List<AttachmentHeader> headers, long timestamp) {
+	void sendMessage(@Nullable String text, List<AttachmentHeader> headers) {
 		// messagingGroupId is loaded with the contact
 		observeForeverOnce(messagingGroupId, groupId -> {
 			requireNonNull(groupId);
-			observeForeverOnce(imageSupport, hasImageSupport -> {
-				requireNonNull(hasImageSupport);
-				createMessage(groupId, text, headers, timestamp,
-						hasImageSupport);
-			});
+			observeForeverOnce(privateMessageFormat, format ->
+					storeMessage(requireNonNull(contactId), groupId, text,
+							headers, format));
 		});
 	}
 
@@ -244,10 +255,10 @@ public class ConversationViewModel extends AndroidViewModel
 
 	@DatabaseExecutor
 	private void checkFeaturesAndOnboarding(ContactId c) throws DbException {
-		// check if images are supported
-		boolean imagesSupported = db.transactionWithResult(true, txn ->
-				messagingManager.contactSupportsImages(txn, c));
-		imageSupport.postValue(imagesSupported);
+		// check if images and auto-deletion are supported
+		PrivateMessageFormat format = db.transactionWithResult(true, txn ->
+				messagingManager.getContactMessageFormat(txn, c));
+		privateMessageFormat.postValue(format);
 
 		// check if introductions are supported
 		Collection<Contact> contacts = contactManager.getContacts();
@@ -256,7 +267,7 @@ public class ConversationViewModel extends AndroidViewModel
 
 		// we only show one onboarding dialog at a time
 		Settings settings = settingsManager.getSettings(SETTINGS_NAMESPACE);
-		if (imagesSupported &&
+		if (format != TEXT_ONLY &&
 				settings.getBoolean(SHOW_ONBOARDING_IMAGE, true)) {
 			onOnboardingShown(SHOW_ONBOARDING_IMAGE);
 			showImageOnboarding.postEvent(true);
@@ -274,40 +285,67 @@ public class ConversationViewModel extends AndroidViewModel
 		settingsManager.mergeSettings(settings, SETTINGS_NAMESPACE);
 	}
 
-	@UiThread
-	private void createMessage(GroupId groupId, @Nullable String text,
-			List<AttachmentHeader> headers, long timestamp,
-			boolean hasImageSupport) {
+	private PrivateMessage createMessage(Transaction txn, ContactId c,
+			GroupId groupId, @Nullable String text,
+			List<AttachmentHeader> headers, PrivateMessageFormat format)
+			throws DbException {
+		long timestamp =
+				conversationManager.getTimestampForOutgoingMessage(txn, c);
 		try {
-			PrivateMessage pm;
-			if (hasImageSupport) {
-				pm = privateMessageFactory.createPrivateMessage(groupId,
+			if (format == TEXT_ONLY) {
+				return privateMessageFactory.createLegacyPrivateMessage(
+						groupId, timestamp, requireNonNull(text));
+			} else if (format == TEXT_IMAGES) {
+				return privateMessageFactory.createPrivateMessage(groupId,
 						timestamp, text, headers);
 			} else {
-				pm = privateMessageFactory.createLegacyPrivateMessage(
-						groupId, timestamp, requireNonNull(text));
+				long timer = autoDeleteManager.getAutoDeleteTimer(txn, c,
+						timestamp);
+				return privateMessageFactory.createPrivateMessage(groupId,
+						timestamp, text, headers, timer);
 			}
-			storeMessage(pm);
 		} catch (FormatException e) {
 			throw new AssertionError(e);
 		}
 	}
 
 	@UiThread
-	private void storeMessage(PrivateMessage m) {
-		attachmentCreator.onAttachmentsSent(m.getMessage().getId());
+	private void storeMessage(ContactId c, GroupId groupId,
+			@Nullable String text, List<AttachmentHeader> headers,
+			PrivateMessageFormat format) {
 		dbExecutor.execute(() -> {
 			try {
-				long start = now();
-				messagingManager.addLocalMessage(m);
-				logDuration(LOG, "Storing message", start);
-				Message message = m.getMessage();
-				PrivateMessageHeader h = new PrivateMessageHeader(
-						message.getId(), message.getGroupId(),
-						message.getTimestamp(), true, true, false, false,
-						m.hasText(), m.getAttachmentHeaders());
-				// TODO add text to cache when available here
-				addedHeader.postEvent(h);
+				db.transaction(false, txn -> {
+					long start = now();
+					PrivateMessage m = createMessage(txn, c, groupId, text,
+							headers, format);
+					messagingManager.addLocalMessage(txn, m);
+					logDuration(LOG, "Storing message", start);
+					Message message = m.getMessage();
+					PrivateMessageHeader h = new PrivateMessageHeader(
+							message.getId(), message.getGroupId(),
+							message.getTimestamp(), true, true, false, false,
+							m.hasText(), m.getAttachmentHeaders(),
+							m.getAutoDeleteTimer());
+					// TODO add text to cache when available here
+					MessageId id = message.getId();
+					txn.attach(() -> attachmentCreator.onAttachmentsSent(id));
+					addedHeader.postEvent(h);
+				});
+			} catch (DbException e) {
+				logException(LOG, WARNING, e);
+			}
+		});
+	}
+
+	void setAutoDeleteTimerEnabled(boolean enabled) {
+		final long timer = enabled ? DAYS.toMillis(7) : NO_AUTO_DELETE_TIMER;
+		// ContactId is set before menu gets inflated and UI interaction
+		final ContactId c = requireNonNull(contactId);
+		dbExecutor.execute(() -> {
+			try {
+				db.transaction(false, txn ->
+						autoDeleteManager.setAutoDeleteTimer(txn, c, timer));
 			} catch (DbException e) {
 				logException(LOG, WARNING, e);
 			}
@@ -330,8 +368,8 @@ public class ConversationViewModel extends AndroidViewModel
 		return contactName;
 	}
 
-	LiveData<Boolean> hasImageSupport() {
-		return imageSupport;
+	LiveData<PrivateMessageFormat> getPrivateMessageFormat() {
+		return privateMessageFormat;
 	}
 
 	LiveEvent<Boolean> showImageOnboarding() {

briar-android/src/main/java/org/briarproject/briar/android/conversation/ImageFragment.java

@@ -27,6 +27,7 @@ import javax.inject.Inject;
 import androidx.annotation.DrawableRes;
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
+import androidx.lifecycle.LifecycleOwner;
 import androidx.lifecycle.ViewModelProvider;
 import androidx.lifecycle.ViewModelProviders;
 
@@ -78,7 +79,7 @@ public class ImageFragment extends Fragment
 	public void onCreate(@Nullable Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 
-		Bundle args = requireNonNull(getArguments());
+		Bundle args = requireArguments();
 		attachment = requireNonNull(args.getParcelable(ATTACHMENT_POSITION));
 		isFirst = args.getBoolean(IS_FIRST);
 		conversationItemId =
@@ -93,7 +94,7 @@ public class ImageFragment extends Fragment
 		View v = inflater.inflate(R.layout.fragment_image, container,
 				false);
 
-		viewModel = ViewModelProviders.of(requireNonNull(getActivity()),
+		viewModel = ViewModelProviders.of(requireActivity(),
 				viewModelFactory).get(ImageViewModel.class);
 
 		photoView = v.findViewById(R.id.photoView);
@@ -110,8 +111,9 @@ public class ImageFragment extends Fragment
 			photoView.setImageResource(R.drawable.ic_image_missing);
 			startPostponedTransition();
 			// state is not final, so observe state changes
+			LifecycleOwner owner = getViewLifecycleOwner();
 			viewModel.getOnAttachmentReceived(attachment.getMessageId())
-					.observeEvent(this, this::onAttachmentReceived);
+					.observeEvent(owner, this::onAttachmentReceived);
 		}
 
 		return v;

briar-android/src/main/java/org/briarproject/briar/android/forum/ForumListFragment.java

@@ -47,7 +47,6 @@ 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;
 import static org.briarproject.bramble.util.LogUtils.logException;
@@ -95,7 +94,7 @@ public class ForumListFragment extends BaseEventFragment implements
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
 
-		requireNonNull(getActivity()).setTitle(R.string.forums_button);
+		requireActivity().setTitle(R.string.forums_button);
 
 		View contentView =
 				inflater.inflate(R.layout.fragment_forum_list, container,

briar-android/src/main/java/org/briarproject/briar/android/introduction/ContactChooserFragment.java

@@ -32,7 +32,6 @@ 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;
 import static org.briarproject.briar.android.conversation.ConversationActivity.CONTACT_ID;
@@ -84,7 +83,7 @@ public class ContactChooserFragment extends BaseFragment {
 					Contact c2 = item.getContact();
 					showMessageScreen(c1, c2);
 				};
-		adapter = new ContactListAdapter(requireNonNull(getActivity()),
+		adapter = new ContactListAdapter(requireActivity(),
 				onContactClickListener);
 
 		list = contentView.findViewById(R.id.list);
@@ -92,8 +91,7 @@ public class ContactChooserFragment extends BaseFragment {
 		list.setAdapter(adapter);
 		list.setEmptyText(R.string.no_contacts);
 
-		contactId = new ContactId(
-				requireNonNull(getArguments()).getInt(CONTACT_ID));
+		contactId = new ContactId(requireArguments().getInt(CONTACT_ID));
 
 		return contentView;
 	}

briar-android/src/main/java/org/briarproject/briar/android/introduction/IntroductionMessageFragment.java

@@ -39,7 +39,6 @@ import static android.app.Activity.RESULT_OK;
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 import static android.widget.Toast.LENGTH_SHORT;
-import static java.util.Objects.requireNonNull;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.briar.android.util.UiUtils.getContactDisplayName;
@@ -102,7 +101,7 @@ public class IntroductionMessageFragment extends BaseFragment
 		}
 
 		// get contact IDs from fragment arguments
-		Bundle args = requireNonNull(getArguments());
+		Bundle args = requireArguments();
 		int contactId1 = args.getInt(CONTACT_ID_1, -1);
 		int contactId2 = args.getInt(CONTACT_ID_2, -1);
 		if (contactId1 == -1 || contactId2 == -1) {
@@ -212,8 +211,7 @@ public class IntroductionMessageFragment extends BaseFragment
 		introductionActivity.runOnDbThread(() -> {
 			// actually make the introduction
 			try {
-				long timestamp = System.currentTimeMillis();
-				introductionManager.makeIntroduction(c1, c2, text, timestamp);
+				introductionManager.makeIntroduction(c1, c2, text);
 			} catch (DbException e) {
 				logException(LOG, WARNING, e);
 				introductionError();

briar-android/src/main/java/org/briarproject/briar/android/keyagreement/KeyAgreementFragment.java

@@ -54,7 +54,6 @@ import static android.view.View.VISIBLE;
 import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
 import static android.widget.LinearLayout.HORIZONTAL;
 import static android.widget.Toast.LENGTH_LONG;
-import static java.util.Objects.requireNonNull;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logException;
@@ -67,6 +66,7 @@ public class KeyAgreementFragment extends BaseEventFragment
 	static final String TAG = KeyAgreementFragment.class.getName();
 
 	private static final Logger LOG = Logger.getLogger(TAG);
+	@SuppressWarnings("CharsetObjectCanBeUsed") // Requires minSdkVersion >= 19
 	private static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");
 
 	@Inject
@@ -138,8 +138,7 @@ public class KeyAgreementFragment extends BaseEventFragment
 	@Override
 	public void onActivityCreated(@Nullable Bundle savedInstanceState) {
 		super.onActivityCreated(savedInstanceState);
-		requireNonNull(getActivity())
-				.setRequestedOrientation(SCREEN_ORIENTATION_NOSENSOR);
+		requireActivity().setRequestedOrientation(SCREEN_ORIENTATION_NOSENSOR);
 		cameraView.setPreviewConsumer(new QrCodeDecoder(this));
 	}
 

briar-android/src/main/java/org/briarproject/briar/android/login/OpenDatabaseFragment.java

@@ -16,6 +16,7 @@ import org.briarproject.briar.android.fragment.BaseFragment;
 import javax.inject.Inject;
 
 import androidx.annotation.Nullable;
+import androidx.lifecycle.LifecycleOwner;
 import androidx.lifecycle.ViewModelProvider;
 import androidx.lifecycle.ViewModelProviders;
 
@@ -51,7 +52,8 @@ public class OpenDatabaseFragment extends BaseFragment {
 
 		StartupViewModel viewModel = ViewModelProviders.of(requireActivity(),
 				viewModelFactory).get(StartupViewModel.class);
-		viewModel.getState().observe(this, this::onStateChanged);
+		LifecycleOwner owner = getViewLifecycleOwner();
+		viewModel.getState().observe(owner, this::onStateChanged);
 
 		return v;
 	}

briar-android/src/main/java/org/briarproject/briar/android/login/PasswordFragment.java

@@ -23,6 +23,7 @@ import javax.annotation.Nullable;
 import javax.inject.Inject;
 
 import androidx.appcompat.app.AlertDialog;
+import androidx.lifecycle.LifecycleOwner;
 import androidx.lifecycle.ViewModelProvider;
 import androidx.lifecycle.ViewModelProviders;
 
@@ -67,7 +68,8 @@ public class PasswordFragment extends BaseFragment implements TextWatcher {
 		viewModel = ViewModelProviders.of(requireActivity(), viewModelFactory)
 				.get(StartupViewModel.class);
 
-		viewModel.getPasswordValidated().observeEvent(this, result -> {
+		LifecycleOwner owner = getViewLifecycleOwner();
+		viewModel.getPasswordValidated().observeEvent(owner, result -> {
 			if (result != SUCCESS) onPasswordInvalid(result);
 		});
 

briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/CreateGroupControllerImpl.java

@@ -7,6 +7,8 @@ import org.briarproject.bramble.api.crypto.CryptoExecutor;
 import org.briarproject.bramble.api.db.DatabaseExecutor;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.NoSuchContactException;
+import org.briarproject.bramble.api.db.Transaction;
+import org.briarproject.bramble.api.db.TransactionManager;
 import org.briarproject.bramble.api.identity.IdentityManager;
 import org.briarproject.bramble.api.identity.LocalAuthor;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
@@ -15,6 +17,8 @@ import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.briar.android.contactselection.ContactSelectorControllerImpl;
 import org.briarproject.briar.android.controller.handler.ResultExceptionHandler;
+import org.briarproject.briar.api.autodelete.AutoDeleteManager;
+import org.briarproject.briar.api.conversation.ConversationManager;
 import org.briarproject.briar.api.privategroup.GroupMessage;
 import org.briarproject.briar.api.privategroup.GroupMessageFactory;
 import org.briarproject.briar.api.privategroup.PrivateGroup;
@@ -35,6 +39,8 @@ import javax.inject.Inject;
 import androidx.annotation.Nullable;
 
 import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
+import static org.briarproject.bramble.api.nullsafety.NullSafety.requireNonNull;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
 @Immutable
@@ -43,9 +49,12 @@ class CreateGroupControllerImpl extends ContactSelectorControllerImpl
 		implements CreateGroupController {
 
 	private static final Logger LOG =
-			Logger.getLogger(CreateGroupControllerImpl.class.getName());
+			getLogger(CreateGroupControllerImpl.class.getName());
 
 	private final Executor cryptoExecutor;
+	private final TransactionManager db;
+	private final AutoDeleteManager autoDeleteManager;
+	private final ConversationManager conversationManager;
 	private final ContactManager contactManager;
 	private final IdentityManager identityManager;
 	private final PrivateGroupFactory groupFactory;
@@ -56,16 +65,26 @@ class CreateGroupControllerImpl extends ContactSelectorControllerImpl
 	private final Clock clock;
 
 	@Inject
-	CreateGroupControllerImpl(@DatabaseExecutor Executor dbExecutor,
+	CreateGroupControllerImpl(
+			@DatabaseExecutor Executor dbExecutor,
 			@CryptoExecutor Executor cryptoExecutor,
-			LifecycleManager lifecycleManager, ContactManager contactManager,
-			IdentityManager identityManager, PrivateGroupFactory groupFactory,
+			TransactionManager db,
+			AutoDeleteManager autoDeleteManager,
+			ConversationManager conversationManager,
+			LifecycleManager lifecycleManager,
+			ContactManager contactManager,
+			IdentityManager identityManager,
+			PrivateGroupFactory groupFactory,
 			GroupMessageFactory groupMessageFactory,
 			PrivateGroupManager groupManager,
 			GroupInvitationFactory groupInvitationFactory,
-			GroupInvitationManager groupInvitationManager, Clock clock) {
+			GroupInvitationManager groupInvitationManager,
+			Clock clock) {
 		super(dbExecutor, lifecycleManager, contactManager);
 		this.cryptoExecutor = cryptoExecutor;
+		this.db = db;
+		this.autoDeleteManager = autoDeleteManager;
+		this.conversationManager = conversationManager;
 		this.contactManager = contactManager;
 		this.identityManager = identityManager;
 		this.groupFactory = groupFactory;
@@ -129,16 +148,14 @@ class CreateGroupControllerImpl extends ContactSelectorControllerImpl
 			ResultExceptionHandler<Void, DbException> handler) {
 		runOnDbThread(() -> {
 			try {
-				LocalAuthor localAuthor = identityManager.getLocalAuthor();
-				List<Contact> contacts = new ArrayList<>();
-				for (ContactId c : contactIds) {
-					try {
-						contacts.add(contactManager.getContact(c));
-					} catch (NoSuchContactException e) {
-						// Continue
-					}
-				}
-				signInvitations(g, localAuthor, contacts, text, handler);
+				db.transaction(true, txn -> {
+					LocalAuthor localAuthor =
+							identityManager.getLocalAuthor(txn);
+					List<InvitationContext> contexts =
+							createInvitationContexts(txn, contactIds);
+					txn.attach(() -> signInvitations(g, localAuthor, contexts,
+							text, handler));
+				});
 			} catch (DbException e) {
 				logException(LOG, WARNING, e);
 				handler.onException(e);
@@ -146,17 +163,32 @@ class CreateGroupControllerImpl extends ContactSelectorControllerImpl
 		});
 	}
 
+	private List<InvitationContext> createInvitationContexts(Transaction txn,
+			Collection<ContactId> contactIds) throws DbException {
+		List<InvitationContext> contexts = new ArrayList<>();
+		for (ContactId c : contactIds) {
+			try {
+				Contact contact = contactManager.getContact(txn, c);
+				long timestamp = conversationManager
+						.getTimestampForOutgoingMessage(txn, c);
+				long timer = autoDeleteManager.getAutoDeleteTimer(txn, c,
+						timestamp);
+				contexts.add(new InvitationContext(contact, timestamp, timer));
+			} catch (NoSuchContactException e) {
+				// Continue
+			}
+		}
+		return contexts;
+	}
+
 	private void signInvitations(GroupId g, LocalAuthor localAuthor,
-			Collection<Contact> contacts, @Nullable String text,
+			List<InvitationContext> contexts, @Nullable String text,
 			ResultExceptionHandler<Void, DbException> handler) {
 		cryptoExecutor.execute(() -> {
-			long timestamp = clock.currentTimeMillis();
-			List<InvitationContext> contexts = new ArrayList<>();
-			for (Contact c : contacts) {
-				byte[] signature = groupInvitationFactory.signInvitation(c, g,
-						timestamp, localAuthor.getPrivateKey());
-				contexts.add(new InvitationContext(c.getId(), timestamp,
-						signature));
+			for (InvitationContext ctx : contexts) {
+				ctx.signature = groupInvitationFactory.signInvitation(
+						ctx.contact, g, ctx.timestamp,
+						localAuthor.getPrivateKey());
 			}
 			sendInvitations(g, contexts, text, handler);
 		});
@@ -167,16 +199,16 @@ class CreateGroupControllerImpl extends ContactSelectorControllerImpl
 			ResultExceptionHandler<Void, DbException> handler) {
 		runOnDbThread(() -> {
 			try {
-				for (InvitationContext context : contexts) {
+				for (InvitationContext ctx : contexts) {
 					try {
 						groupInvitationManager.sendInvitation(g,
-								context.contactId, text, context.timestamp,
-								context.signature);
+								ctx.contact.getId(), text, ctx.timestamp,
+								requireNonNull(ctx.signature),
+								ctx.autoDeleteTimer);
 					} catch (NoSuchContactException e) {
 						// Continue
 					}
 				}
-				//noinspection ConstantConditions
 				handler.onResult(null);
 			} catch (DbException e) {
 				logException(LOG, WARNING, e);
@@ -187,15 +219,16 @@ class CreateGroupControllerImpl extends ContactSelectorControllerImpl
 
 	private static class InvitationContext {
 
-		private final ContactId contactId;
-		private final long timestamp;
-		private final byte[] signature;
+		private final Contact contact;
+		private final long timestamp, autoDeleteTimer;
+		@Nullable
+		private byte[] signature = null;
 
-		private InvitationContext(ContactId contactId, long timestamp,
-				byte[] signature) {
-			this.contactId = contactId;
+		private InvitationContext(Contact contact, long timestamp,
+				long autoDeleteTimer) {
+			this.contact = contact;
 			this.timestamp = timestamp;
-			this.signature = signature;
+			this.autoDeleteTimer = autoDeleteTimer;
 		}
 	}
 }

briar-android/src/main/java/org/briarproject/briar/android/privategroup/creation/GroupInviteFragment.java

@@ -15,7 +15,6 @@ import javax.inject.Inject;
 
 import androidx.annotation.Nullable;
 
-import static java.util.Objects.requireNonNull;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 
 @MethodsNotNullByDefault
@@ -43,7 +42,7 @@ public class GroupInviteFragment extends ContactSelectorFragment {
 	@Override
 	public void onCreate(@Nullable Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
-		requireNonNull(getActivity()).setTitle(R.string.groups_invite_members);
+		requireActivity().setTitle(R.string.groups_invite_members);
 	}
 
 	@Override

briar-android/src/main/java/org/briarproject/briar/android/privategroup/list/GroupListFragment.java

@@ -39,7 +39,6 @@ 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
 @ParametersNotNullByDefault
@@ -72,7 +71,7 @@ public class GroupListFragment extends BaseFragment implements
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
 
-		requireNonNull(getActivity()).setTitle(R.string.groups_button);
+		requireActivity().setTitle(R.string.groups_button);
 
 		View v = inflater.inflate(R.layout.list, container, false);
 

briar-android/src/main/java/org/briarproject/briar/android/reporting/CrashFragment.java

@@ -12,8 +12,6 @@ import org.briarproject.briar.R;
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
 
-import static java.util.Objects.requireNonNull;
-
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 public class CrashFragment extends Fragment {
@@ -35,7 +33,7 @@ public class CrashFragment extends Fragment {
 	}
 
 	private DevReportActivity getDevReportActivity() {
-		return (DevReportActivity) requireNonNull(getActivity());
+		return (DevReportActivity) requireActivity();
 	}
 
 }

briar-android/src/main/java/org/briarproject/briar/android/reporting/ReportFormFragment.java

@@ -113,7 +113,7 @@ public class ReportFormFragment extends Fragment
 		report = v.findViewById(R.id.report_content);
 		progress = v.findViewById(R.id.progress_wheel);
 
-		Bundle args = requireNonNull(getArguments());
+		Bundle args = requireArguments();
 		isFeedback = args.getBoolean(IS_FEEDBACK);
 		reportFile =
 				(File) requireNonNull(args.getSerializable(EXTRA_REPORT_FILE));
@@ -285,7 +285,7 @@ public class ReportFormFragment extends Fragment
 	}
 
 	private DevReportActivity getDevReportActivity() {
-		return (DevReportActivity) requireNonNull(getActivity());
+		return (DevReportActivity) requireActivity();
 	}
 
 }

briar-android/src/main/java/org/briarproject/briar/android/sharing/ShareBlogControllerImpl.java

@@ -10,11 +10,9 @@ import org.briarproject.bramble.api.db.NoSuchGroupException;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
-import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.briar.android.contactselection.ContactSelectorControllerImpl;
 import org.briarproject.briar.android.controller.handler.ExceptionHandler;
 import org.briarproject.briar.api.blog.BlogSharingManager;
-import org.briarproject.briar.api.conversation.ConversationManager;
 
 import java.util.Collection;
 import java.util.concurrent.Executor;
@@ -25,6 +23,7 @@ import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
 @Immutable
@@ -33,21 +32,16 @@ class ShareBlogControllerImpl extends ContactSelectorControllerImpl
 		implements ShareBlogController {
 
 	private final static Logger LOG =
-			Logger.getLogger(ShareBlogControllerImpl.class.getName());
+			getLogger(ShareBlogControllerImpl.class.getName());
 
-	private final ConversationManager conversationManager;
 	private final BlogSharingManager blogSharingManager;
-	private final Clock clock;
 
 	@Inject
 	ShareBlogControllerImpl(@DatabaseExecutor Executor dbExecutor,
 			LifecycleManager lifecycleManager, ContactManager contactManager,
-			ConversationManager conversationManager,
-			BlogSharingManager blogSharingManager, Clock clock) {
+			BlogSharingManager blogSharingManager) {
 		super(dbExecutor, lifecycleManager, contactManager);
-		this.conversationManager = conversationManager;
 		this.blogSharingManager = blogSharingManager;
-		this.clock = clock;
 	}
 
 	@Override
@@ -62,10 +56,7 @@ class ShareBlogControllerImpl extends ContactSelectorControllerImpl
 			try {
 				for (ContactId c : contacts) {
 					try {
-						long time = Math.max(clock.currentTimeMillis(),
-								conversationManager.getGroupCount(c)
-										.getLatestMsgTime() + 1);
-						blogSharingManager.sendInvitation(g, c, text, time);
+						blogSharingManager.sendInvitation(g, c, text);
 					} catch (NoSuchContactException | NoSuchGroupException e) {
 						logException(LOG, WARNING, e);
 					}

briar-android/src/main/java/org/briarproject/briar/android/sharing/ShareForumControllerImpl.java

@@ -10,10 +10,8 @@ import org.briarproject.bramble.api.db.NoSuchGroupException;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
-import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.briar.android.contactselection.ContactSelectorControllerImpl;
 import org.briarproject.briar.android.controller.handler.ExceptionHandler;
-import org.briarproject.briar.api.conversation.ConversationManager;
 import org.briarproject.briar.api.forum.ForumSharingManager;
 
 import java.util.Collection;
@@ -25,6 +23,7 @@ import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
 @Immutable
@@ -33,21 +32,16 @@ class ShareForumControllerImpl extends ContactSelectorControllerImpl
 		implements ShareForumController {
 
 	private final static Logger LOG =
-			Logger.getLogger(ShareForumControllerImpl.class.getName());
+			getLogger(ShareForumControllerImpl.class.getName());
 
-	private final ConversationManager conversationManager;
 	private final ForumSharingManager forumSharingManager;
-	private final Clock clock;
 
 	@Inject
 	ShareForumControllerImpl(@DatabaseExecutor Executor dbExecutor,
 			LifecycleManager lifecycleManager, ContactManager contactManager,
-			ConversationManager conversationManager,
-			ForumSharingManager forumSharingManager, Clock clock) {
+			ForumSharingManager forumSharingManager) {
 		super(dbExecutor, lifecycleManager, contactManager);
-		this.conversationManager = conversationManager;
 		this.forumSharingManager = forumSharingManager;
-		this.clock = clock;
 	}
 
 	@Override
@@ -62,10 +56,7 @@ class ShareForumControllerImpl extends ContactSelectorControllerImpl
 			try {
 				for (ContactId c : contacts) {
 					try {
-						long time = Math.max(clock.currentTimeMillis(),
-								conversationManager.getGroupCount(c)
-										.getLatestMsgTime() + 1);
-						forumSharingManager.sendInvitation(g, c, text, time);
+						forumSharingManager.sendInvitation(g, c, text);
 					} catch (NoSuchContactException | NoSuchGroupException e) {
 						logException(LOG, WARNING, e);
 					}

briar-android/src/main/java/org/briarproject/briar/android/util/BriarNotificationBuilder.java

@@ -11,11 +11,13 @@ import androidx.core.content.ContextCompat;
 import static android.os.Build.VERSION.SDK_INT;
 import static androidx.core.app.NotificationCompat.VISIBILITY_PRIVATE;
 
-
 public class BriarNotificationBuilder extends NotificationCompat.Builder {
 
+	private final Context context;
+
 	public BriarNotificationBuilder(Context context, String channelId) {
 		super(context, channelId);
+		this.context = context;
 		// Auto-cancel does not fire the delete intent, see
 		// https://issuetracker.google.com/issues/36961721
 		setAutoCancel(true);
@@ -26,7 +28,7 @@ public class BriarNotificationBuilder extends NotificationCompat.Builder {
 	}
 
 	public BriarNotificationBuilder setColorRes(@ColorRes int res) {
-		setColor(ContextCompat.getColor(mContext, res));
+		setColor(ContextCompat.getColor(context, res));
 		return this;
 	}
 

briar-android/src/main/java/org/briarproject/briar/android/widget/LinkDialogFragment.java

@@ -49,7 +49,7 @@ public class LinkDialogFragment extends DialogFragment {
 	public void onCreate(@Nullable Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 
-		Bundle args = requireNonNull(getArguments());
+		Bundle args = requireArguments();
 		url = requireNonNull(args.getString("url"));
 
 		setStyle(STYLE_NO_TITLE, R.style.BriarDialogTheme);
@@ -70,7 +70,7 @@ public class LinkDialogFragment extends DialogFragment {
 		Context ctx = requireContext();
 		Intent i = new Intent(ACTION_VIEW, Uri.parse(url));
 		PackageManager packageManager = ctx.getPackageManager();
-		List activities =
+		List<?> activities =
 				packageManager.queryIntentActivities(i, MATCH_DEFAULT_ONLY);
 		boolean choice = activities.size() > 1;
 		Intent intent = choice ? Intent.createChooser(i,

briar-android/src/main/res/drawable/ic_bomb.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+	android:width="16dp"
+	android:height="16dp"
+	android:viewportWidth="24"
+	android:viewportHeight="24">
+	<path
+		android:fillColor="#FFFFFF"
+		android:pathData="M11.25,6A3.25,3.25 0 0,1 14.5,2.75A3.25,3.25 0 0,1 17.75,6C17.75,6.42 18.08,6.75 18.5,6.75C18.92,6.75 19.25,6.42 19.25,6V5.25H20.75V6A2.25,2.25 0 0,1 18.5,8.25A2.25,2.25 0 0,1 16.25,6A1.75,1.75 0 0,0 14.5,4.25A1.75,1.75 0 0,0 12.75,6H14V7.29C16.89,8.15 19,10.83 19,14A7,7 0 0,1 12,21A7,7 0 0,1 5,14C5,10.83 7.11,8.15 10,7.29V6H11.25M22,6H24V7H22V6M19,4V2H20V4H19M20.91,4.38L22.33,2.96L23.04,3.67L21.62,5.09L20.91,4.38Z" />
+</vector>

briar-android/src/main/res/drawable/ic_launcher_foreground.xml

@@ -0,0 +1,43 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+  <group android:scaleX="0.20807062"
+      android:scaleY="0.20807062"
+      android:translateX="19.73077"
+      android:translateY="19.73077">
+    <path
+        android:pathData="M94,144.5V264c0,9.7 7.9,17.7 17.7,17.7h8.3c9.7,0 17.7,-8 17.7,-17.7V144.5Z"
+        android:fillColor="#87c214"
+        android:strokeColor="#00000000"/>
+    <path
+        android:pathData="M137.7,86.8V64.3c0,-9.7 -8,-17.7 -17.7,-17.7h-8.3C102,46.6 94,54.6 94,64.3v22.5z"
+        android:fillColor="#87c214"
+        android:strokeColor="#00000000"/>
+    <path
+        android:pathData="M234.7,183.8V64.3c0,-9.7 -7.9,-17.7 -17.7,-17.7h-8.3c-9.7,0 -17.7,8 -17.7,17.7v119.5z"
+        android:fillColor="#87c214"
+        android:strokeColor="#00000000"/>
+    <path
+        android:pathData="M191,241.5V264c0,9.7 8,17.7 17.7,17.7h8.3c9.7,0 17.7,-8 17.7,-17.7v-22.5z"
+        android:fillColor="#87c214"
+        android:strokeColor="#00000000"/>
+    <path
+        android:pathData="M87,190.8H64.5c-9.7,0 -17.7,7.9 -17.7,17.7v8.3c0,9.7 7.9,17.7 17.7,17.7H87Z"
+        android:fillColor="#95d220"
+        android:strokeColor="#00000000"/>
+    <path
+        android:pathData="M264.2,190.8H144.7v43.7h119.5c9.7,0 17.7,-8 17.7,-17.7v-8.3c-0.1,-9.7 -8,-17.7 -17.7,-17.7z"
+        android:fillColor="#95d220"
+        android:strokeColor="#00000000"/>
+    <path
+        android:pathData="M184,93.8H64.5c-9.7,0 -17.7,7.9 -17.7,17.7v8.3c0,9.7 7.9,17.7 17.7,17.7H184Z"
+        android:fillColor="#95d220"
+        android:strokeColor="#00000000"/>
+    <path
+        android:pathData="m264.2,93.8h-22.5v43.7h22.5c9.7,0 17.7,-7.9 17.7,-17.7v-8.3c-0.1,-9.7 -8,-17.7 -17.7,-17.7z"
+        android:fillColor="#95d220"
+        android:strokeColor="#00000000"/>
+  </group>
+</vector>

briar-android/src/main/res/layout-land/fragment_keyagreement_id.xml

@@ -1,9 +1,8 @@
 <?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">
@@ -22,12 +21,12 @@
 			android:padding="@dimen/margin_medium"
 			android:scaleType="fitCenter"
 			android:src="@drawable/qr_code_intro"
-			android:tint="@color/color_primary"
 			app:layout_constraintBottom_toBottomOf="@id/explanationText"
 			app:layout_constraintEnd_toStartOf="@id/explanationText"
 			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toTopOf="parent"
-			tools:ignore="ContentDescription"/>
+			app:tint="@color/color_primary"
+			tools:ignore="ContentDescription" />
 
 		<ImageView
 			android:id="@+id/explanationImage"
@@ -35,16 +34,16 @@
 			android:layout_height="wrap_content"
 			android:layout_weight="1"
 			android:adjustViewBounds="true"
-			android:paddingEnd="@dimen/margin_large"
 			android:paddingStart="@dimen/margin_large"
 			android:paddingTop="@dimen/margin_large"
+			android:paddingEnd="@dimen/margin_large"
 			android:scaleType="fitCenter"
 			android:src="@drawable/qr_code_explanation"
 			app:layout_constraintBottom_toTopOf="@id/explanationText"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toEndOf="@id/diagram"
 			app:layout_constraintTop_toTopOf="parent"
-			tools:ignore="ContentDescription"/>
+			tools:ignore="ContentDescription" />
 
 		<TextView
 			android:id="@+id/explanationText"
@@ -55,7 +54,7 @@
 			android:text="@string/face_to_face"
 			app:layout_constraintEnd_toEndOf="parent"
 			app:layout_constraintStart_toEndOf="@id/diagram"
-			app:layout_constraintTop_toBottomOf="@id/explanationImage"/>
+			app:layout_constraintTop_toBottomOf="@id/explanationImage" />
 
 		<View
 			android:id="@+id/explanationBorder"
@@ -65,14 +64,14 @@
 			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" />
 
 		<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="diagram,explanationBorder"/>
+			app:constraint_referenced_ids="diagram,explanationBorder" />
 
 		<Button
 			android:id="@+id/continueButton"
@@ -83,7 +82,7 @@
 			android:layout_marginTop="@dimen/margin_medium"
 			android:text="@string/continue_button"
 			app:layout_constraintBottom_toBottomOf="parent"
-			app:layout_constraintTop_toBottomOf="@id/barrier"/>
+			app:layout_constraintTop_toBottomOf="@id/barrier" />
 
 	</androidx.constraintlayout.widget.ConstraintLayout>
 

briar-android/src/main/res/layout/activity_conversation_settings.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<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.conversation.ConversationSettingsFragment"
+		android:layout_width="match_parent"
+		android:layout_height="match_parent" />
+</FrameLayout>

briar-android/src/main/res/layout/activity_nav_drawer.xml

@@ -53,10 +53,10 @@
 				android:contentDescription="@string/close"
 				android:scaleType="center"
 				android:src="@drawable/ic_close"
-				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"
+				app:tint="@color/briar_text_tertiary_inverse" />
 
 		</androidx.constraintlayout.widget.ConstraintLayout>
 

briar-android/src/main/res/layout/fragment_conversation_settings.xml

@@ -0,0 +1,87 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView 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"
+	android:paddingHorizontal="@dimen/margin_large">
+
+	<androidx.constraintlayout.widget.ConstraintLayout
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content">
+
+		<ImageView
+			android:id="@+id/imageViewBomb"
+			android:layout_width="64dp"
+			android:layout_height="64dp"
+			android:layout_marginTop="16dp"
+			android:src="@drawable/ic_bomb"
+			app:layout_constraintEnd_toEndOf="parent"
+			app:layout_constraintStart_toStartOf="parent"
+			app:layout_constraintTop_toTopOf="parent"
+			app:tint="?attr/colorControlNormal" />
+
+		<TextView
+			android:id="@+id/buttonLearnMore"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:layout_marginTop="@dimen/margin_large"
+			android:clickable="true"
+			android:focusable="true"
+			android:text="@string/learn_more"
+			android:textColor="?android:attr/textColorLink"
+			app:layout_constraintStart_toStartOf="parent"
+			app:layout_constraintTop_toBottomOf="@+id/imageViewBomb" />
+
+		<View
+			android:id="@+id/divider"
+			style="@style/Divider.Horizontal"
+			android:layout_width="match_parent"
+			android:layout_height="1dp"
+			android:layout_marginVertical="16dp"
+			android:background="?android:attr/listDivider"
+			app:layout_constraintBottom_toTopOf="@+id/barrier1"
+			app:layout_constraintTop_toBottomOf="@+id/buttonLearnMore" />
+
+		<androidx.constraintlayout.widget.Barrier
+			android:id="@+id/barrier1"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			app:barrierDirection="top" />
+
+		<TextView
+			android:id="@+id/headlineSetting"
+			android:layout_width="0dp"
+			android:layout_height="wrap_content"
+			android:text="@string/disappearing_messages_title"
+			android:textStyle="bold"
+			app:layout_constraintStart_toStartOf="parent"
+			app:layout_constraintTop_toBottomOf="@+id/barrier1" />
+
+		<TextView
+			android:id="@+id/textSetting"
+			android:layout_width="0dp"
+			android:layout_height="wrap_content"
+			android:text="@string/disappearing_messages_summary"
+			app:layout_constraintBottom_toTopOf="@id/barrier2"
+			app:layout_constraintEnd_toStartOf="@id/switchDisappearingMessages"
+			app:layout_constraintStart_toStartOf="parent"
+			app:layout_constraintTop_toBottomOf="@+id/headlineSetting" />
+
+		<androidx.appcompat.widget.SwitchCompat
+			android:id="@+id/switchDisappearingMessages"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			app:layout_constraintBottom_toTopOf="@id/barrier2"
+			app:layout_constraintEnd_toEndOf="parent"
+			app:layout_constraintStart_toEndOf="@+id/textSetting"
+			app:layout_constraintTop_toBottomOf="@+id/barrier1" />
+
+		<androidx.constraintlayout.widget.Barrier
+			android:id="@+id/barrier2"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			app:barrierDirection="top" />
+
+	</androidx.constraintlayout.widget.ConstraintLayout>
+
+</ScrollView>

briar-android/src/main/res/layout/fragment_conversation_settings_learn_more.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ScrollView 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"
+	android:paddingHorizontal="?dialogPreferredPadding">
+
+	<TextView
+		android:id="@+id/textView"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:text="@string/disappearing_messages_explanation_long"
+		app:layout_constraintBottom_toBottomOf="parent"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toTopOf="parent" />
+
+</ScrollView>

briar-android/src/main/res/layout/fragment_keyagreement_id.xml

@@ -20,11 +20,11 @@
 			android:paddingBottom="@dimen/margin_large"
 			android:scaleType="fitCenter"
 			android:src="@drawable/qr_code_intro"
-			android:tint="@color/color_primary"
 			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"
+			app:tint="@color/color_primary" />
 
 		<ImageView
 			android:id="@+id/explanationImage"

briar-android/src/main/res/layout/fragment_open_database.xml

@@ -11,13 +11,13 @@
 		android:layout_height="128dp"
 		android:scaleType="center"
 		android:src="@drawable/startup_lock"
-		android:tint="@color/briar_accent"
 		app:layout_constraintBottom_toTopOf="@+id/textView"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
 		app:layout_constraintVertical_bias="0.5"
 		app:layout_constraintVertical_chainStyle="packed"
+		app:tint="@color/briar_accent"
 		tools:ignore="ContentDescription" />
 
 	<ProgressBar

briar-android/src/main/res/layout/fragment_sign_out.xml

@@ -11,13 +11,13 @@
 		android:layout_height="128dp"
 		android:scaleType="center"
 		android:src="@drawable/startup_lock"
-		android:tint="@color/briar_primary"
 		app:layout_constraintBottom_toTopOf="@+id/textView"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
 		app:layout_constraintVertical_bias="0.5"
 		app:layout_constraintVertical_chainStyle="packed"
+		app:tint="@color/briar_primary"
 		tools:ignore="ContentDescription" />
 
 	<ProgressBar

briar-android/src/main/res/layout/list_item_conversation_msg_image.xml

@@ -68,6 +68,16 @@
 			android:layout_height="wrap_content"
 			tools:text="Dec 24, 13:37" />
 
+		<ImageView
+			android:id="@+id/bomb"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:layout_marginStart="4dp"
+			android:layout_marginEnd="4dp"
+			android:src="@drawable/ic_bomb"
+			app:tint="?android:attr/textColorSecondary"
+			tools:ignore="ContentDescription" />
+
 	</LinearLayout>
 
 </androidx.constraintlayout.widget.ConstraintLayout>

briar-android/src/main/res/layout/list_item_conversation_msg_image_text.xml

@@ -67,6 +67,16 @@
 			android:layout_height="wrap_content"
 			tools:text="Dec 24, 13:37" />
 
+		<ImageView
+			android:id="@+id/bomb"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:layout_marginStart="4dp"
+			android:layout_marginEnd="4dp"
+			android:src="@drawable/ic_bomb"
+			app:tint="?android:attr/textColorSecondary"
+			tools:ignore="ContentDescription" />
+
 	</LinearLayout>
 
 </androidx.constraintlayout.widget.ConstraintLayout>

briar-android/src/main/res/layout/list_item_conversation_msg_in_content.xml

@@ -68,6 +68,17 @@
 			android:layout_height="wrap_content"
 			tools:text="Dec 24, 13:37" />
 
+		<ImageView
+			android:id="@+id/bomb"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:layout_marginStart="4dp"
+			android:layout_marginLeft="4dp"
+			android:src="@drawable/ic_bomb"
+			app:tint="?android:attr/textColorSecondary"
+			tools:ignore="ContentDescription"
+			tools:visibility="visible" />
+
 	</LinearLayout>
 
 </androidx.constraintlayout.widget.ConstraintLayout>

briar-android/src/main/res/layout/list_item_conversation_msg_out.xml

@@ -73,11 +73,20 @@
 				style="@style/TextMessage.Timestamp"
 				android:layout_width="wrap_content"
 				android:layout_height="wrap_content"
-				android:layout_marginEnd="6dp"
-				android:layout_marginRight="6dp"
+				android:layout_marginEnd="4dp"
+				android:layout_marginRight="4dp"
 				android:textColor="@color/private_message_date_inverse"
 				tools:text="Dec 24, 13:37" />
 
+			<ImageView
+				android:id="@+id/bomb"
+				android:layout_width="wrap_content"
+				android:layout_height="wrap_content"
+				android:layout_marginEnd="4dp"
+				android:layout_marginRight="4dp"
+				android:src="@drawable/ic_bomb"
+				tools:ignore="ContentDescription" />
+
 			<ImageView
 				android:id="@+id/status"
 				android:layout_width="wrap_content"

briar-android/src/main/res/layout/list_item_conversation_notice_in.xml

@@ -48,10 +48,28 @@
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
 			android:layout_marginTop="@dimen/message_bubble_timestamp_margin"
-			app:layout_constraintEnd_toEndOf="@+id/text"
+			app:layout_constraintEnd_toStartOf="@+id/bomb"
+			app:layout_constraintHorizontal_bias="1.0"
+			app:layout_constraintHorizontal_chainStyle="packed"
+			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/text"
 			tools:text="Dec 24, 13:37" />
 
+		<ImageView
+			android:id="@+id/bomb"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:layout_marginStart="4dp"
+			android:layout_marginLeft="4dp"
+			android:layout_marginTop="@dimen/message_bubble_timestamp_margin"
+			android:src="@drawable/ic_bomb"
+			app:layout_constraintEnd_toEndOf="@+id/text"
+			app:layout_constraintStart_toEndOf="@+id/time"
+			app:layout_constraintTop_toBottomOf="@+id/text"
+			app:tint="?android:attr/textColorSecondary"
+			tools:ignore="ContentDescription"
+			tools:visibility="visible" />
+
 	</androidx.constraintlayout.widget.ConstraintLayout>
 
-</LinearLayout>
+</LinearLayout>

briar-android/src/main/res/layout/list_item_conversation_notice_out.xml

@@ -55,14 +55,26 @@
 			app:layout_constraintTop_toBottomOf="@+id/text"
 			tools:text="Dec 24, 13:37" />
 
+		<ImageView
+			android:id="@+id/bomb"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:layout_marginStart="4dp"
+			android:layout_marginLeft="4dp"
+			android:src="@drawable/ic_bomb"
+			app:layout_constraintBottom_toBottomOf="@+id/time"
+			app:layout_constraintStart_toEndOf="@+id/time"
+			app:layout_constraintTop_toTopOf="@+id/time"
+			tools:ignore="ContentDescription" />
+
 		<ImageView
 			android:id="@+id/status"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
-			android:layout_marginStart="@dimen/margin_medium"
-			android:layout_marginLeft="@dimen/margin_medium"
+			android:layout_marginStart="4dp"
+			android:layout_marginLeft="4dp"
 			app:layout_constraintBottom_toBottomOf="@+id/time"
-			app:layout_constraintStart_toEndOf="@+id/time"
+			app:layout_constraintStart_toEndOf="@+id/bomb"
 			app:layout_constraintTop_toTopOf="@+id/time"
 			tools:ignore="ContentDescription"
 			tools:src="@drawable/message_delivered" />

briar-android/src/main/res/layout/list_item_conversation_request.xml

@@ -68,10 +68,27 @@
 			style="@style/TextMessage.Timestamp"
 			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
-			app:layout_constraintEnd_toEndOf="parent"
+			app:layout_constraintEnd_toStartOf="@+id/bomb"
+			app:layout_constraintHorizontal_bias="1.0"
+			app:layout_constraintHorizontal_chainStyle="packed"
+			app:layout_constraintStart_toStartOf="parent"
 			app:layout_constraintTop_toBottomOf="@+id/acceptButton"
 			tools:text="Dec 24, 13:37" />
 
+		<ImageView
+			android:id="@+id/bomb"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:layout_marginStart="4dp"
+			android:layout_marginLeft="4dp"
+			android:src="@drawable/ic_bomb"
+			app:layout_constraintEnd_toEndOf="parent"
+			app:layout_constraintStart_toEndOf="@+id/time"
+			app:layout_constraintTop_toBottomOf="@+id/acceptButton"
+			app:tint="?android:attr/textColorSecondary"
+			tools:ignore="ContentDescription"
+			tools:visibility="visible" />
+
 	</androidx.constraintlayout.widget.ConstraintLayout>
 
-</LinearLayout>
+</LinearLayout>

briar-android/src/main/res/menu/conversation_actions.xml

@@ -1,30 +1,37 @@
 <?xml version="1.0" encoding="utf-8"?>
-<menu
-	xmlns:android="http://schemas.android.com/apk/res/android"
-	xmlns:app="http://schemas.android.com/apk/res-auto">
+<menu 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">
 
 	<item
 		android:id="@+id/action_introduction"
+		android:enabled="false"
 		android:icon="@drawable/introduction_white"
 		android:title="@string/introduction_menu_item"
-		android:enabled="false"
-		app:showAsAction="never"/>
+		app:showAsAction="never" />
 
 	<item
 		android:id="@+id/action_set_alias"
-		android:title="@string/set_contact_alias"
 		android:enabled="false"
-		app:showAsAction="never"/>
+		android:title="@string/set_contact_alias"
+		app:showAsAction="never" />
+
+	<item
+		android:id="@+id/action_conversation_settings"
+		android:title="@string/menu_item_disappearing_messages"
+		android:visible="false"
+		app:showAsAction="never"
+		tools:visible="true" />
 
 	<item
 		android:id="@+id/action_delete_all_messages"
 		android:title="@string/delete_all_messages"
-		app:showAsAction="never"/>
+		app:showAsAction="never" />
 
 	<item
 		android:id="@+id/action_social_remove_person"
 		android:icon="@drawable/action_delete_white"
 		android:title="@string/delete_contact"
-		app:showAsAction="never"/>
+		app:showAsAction="never" />
 
-</menu>
+</menu>

briar-android/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_launcher_background"/>
+    <foreground android:drawable="@drawable/ic_launcher_foreground"/>
+</adaptive-icon>

briar-android/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_launcher_background"/>
+    <foreground android:drawable="@drawable/ic_launcher_foreground"/>
+</adaptive-icon>

briar-android/src/main/res/values-ar/strings.xml

@@ -215,7 +215,6 @@
   <string name="connecting_to_device">يتم الإتصال بالجهاز\u2026</string>
   <string name="authenticating_with_device">يتم التوثيق مع الجهاز\u2026</string>
   <string name="connection_error_title">لم يمكن الإتصال بجهة إتصالك</string>
-  <string name="connection_error_explanation">رجاءًا التأكد أن كليكما متصل بنفس شبكة الواي فاي.</string>
   <string name="connection_error_feedback">إذا إستمرت المشكلة، رجاءًا <a href="feedback">أرسل تقرير </a> لمساعدتنا على تحسين التطبيق.</string>
   <!--Adding Contacts Remotely-->
   <string name="add_contact_remotely_title_case">إضافة جهة اتصال عن بعد </string>

briar-android/src/main/res/values-az/strings.xml

@@ -162,7 +162,6 @@
   <string name="connecting_to_device">Cihaza qoşulma /2026</string>
   <string name="authenticating_with_device">Cihazla təsdiqlənir \u2026</string>
   <string name="connection_error_title">Kontaktınıza qoşula bilmədi</string>
-  <string name="connection_error_explanation">Həmin Wi-Fi şəbəkəsinə qoşulduğunuzu yoxlayın.</string>
   <string name="connection_error_feedback"><a href="feedback">Bu problem davam edərsə, tətbiqin təkmilləşdirilməsinə kömək etmək üçün rəy göndərin.</a></string>
   <!--Adding Contacts Remotely-->
   <string name="add_contact_remotely_title_case">Məsafədə kontakt əlavə etmək </string>

briar-android/src/main/res/values-bs/strings.xml

@@ -134,7 +134,6 @@
   <string name="connecting_to_device">Povezujem se sa uređajem\u2026</string>
   <string name="authenticating_with_device">Autentikacija sa uređajem\u2026</string>
   <string name="connection_error_title">Nije moguće povezivanje sa vašim kontaktom</string>
-  <string name="connection_error_explanation">Provjerite jeste li oboje povezani na ist Wi-Fi mrežu.</string>
   <string name="connection_error_feedback">Ako se problem ponavlja, Molimo vas <a href="feedback">pošaljite povratne informacije</a> kako bi pomogli poboljšanju aplikacije.</string>
   <!--Adding Contacts Remotely-->
   <string name="add_contact_remotely_title_case">Dodaj udaljeni konktakt</string>

briar-android/src/main/res/values-ca/strings.xml

@@ -27,7 +27,7 @@
   <string name="enter_password">Contrasenya</string>
   <string name="try_again">La contrasenya és incorrecta, torneu a escriure-la</string>
   <string name="dialog_title_cannot_check_password">No es pot verificar la contrasenya</string>
-  <string name="dialog_message_cannot_check_password">El Briar no pot verificar la contrasenya. Proveu de reiniciar el vostre aparell per a solucionar aquest problema.</string>
+  <string name="dialog_message_cannot_check_password">Briar no pot verificar la contrasenya. Proveu de reiniciar el vostre aparell per a solucionar aquest problema.</string>
   <string name="sign_in_button">Inicia la sessió</string>
   <string name="forgotten_password">No recordo la contrasenya</string>
   <string name="dialog_title_lost_password">Contrasenya perduda</string>
@@ -44,9 +44,9 @@
     <item quantity="other">Aquesta és una versió de prova de Briar. El vostre compte caducarà en %d dies i no es podrà renovar.</item>
   </plurals>
   <string name="expiry_date_reached">Aquesta versió de Briar ha caducat.\nGràcies per haver-lo provat!</string>
-  <string name="download_briar">Per continuar utilitzant el Briar, baixeu la darrera versió.</string>
+  <string name="download_briar">Per continuar utilitzant Briar, baixeu la darrera versió.</string>
   <string name="create_new_account">Haureu de crear un compte nou, però podeu utilitzar el mateix sobrenom.</string>
-  <string name="download_briar_button">Baixa l\'última versió</string>
+  <string name="download_briar_button">Descarrega la darrera versió</string>
   <string name="startup_open_database">S\'està desxifrant la base de dades...</string>
   <string name="startup_migrate_database">S\'està actualitzant la base de dades...</string>
   <string name="startup_compact_database">S\'està compactant la base de dades...</string>
@@ -61,12 +61,36 @@
   <string name="lock_button">Bloqueja l\'aplicació</string>
   <string name="settings_button">Configuració</string>
   <string name="sign_out_button">Tanca la sessió </string>
+  <string name="transports_onboarding_text">Toqueu per decidir com es connecta Briar als vostres contactes.</string>
   <!--Transports: Tor-->
   <string name="transport_tor">Internet</string>
+  <string name="tor_device_status_online_wifi">El mòbil té accés a Internet via WiFi</string>
+  <string name="tor_device_status_online_mobile">El mòbil té accés a Internet via dades</string>
+  <string name="tor_device_status_offline">El mòbil no té accés a Internet</string>
+  <string name="tor_plugin_status_enabling">Briar s\'està connectant a Internet</string>
+  <string name="tor_plugin_status_active">Briar està connectat a Internet</string>
+  <string name="tor_plugin_status_inactive">Briar no pot connectar-se a Internet</string>
+  <string name="tor_plugin_status_disabled">Briar està configurat per a no emprar Internet</string>
+  <string name="tor_plugin_status_disabled_mobile_data">Briar està configurat per a no emprar dades mòbils</string>
+  <string name="tor_plugin_status_disabled_battery">Briar està configurat per a no usar Internet mentre funciona amb bateria</string>
+  <string name="tor_plugin_status_disabled_country_blocked">Briar està configurat per a no emprar Internet en aquest país</string>
   <!--Transports: Wi-Fi-->
   <string name="transport_lan">Wi-Fi</string>
+  <string name="transport_lan_long">La mateixa xarxa WiFi</string>
+  <string name="lan_device_status_on">El mòbil està connectat a WiFi</string>
+  <string name="lan_device_status_off">El mòbil no està connectat a WiFi</string>
+  <string name="lan_plugin_status_enabling">Briar s\'està connectant a la xarxa WiFi</string>
+  <string name="lan_plugin_status_active">Briar està connectat a la xarxa WiFi</string>
+  <string name="lan_plugin_status_inactive">Briar no pot connectar-se a la xarxa WiFi</string>
+  <string name="lan_plugin_status_disabled">Briar està configurat per a no emprar la xarxa WiFi</string>
   <!--Transports: Bluetooth-->
   <string name="transport_bt">Bluetooth</string>
+  <string name="bt_device_status_on">El Bluetooth del mòbil està apagat</string>
+  <string name="bt_device_status_off">El Bluetooth del mòbil està engegat</string>
+  <string name="bt_plugin_status_enabling">Briar s\'està connectant a Bluetooth</string>
+  <string name="bt_plugin_status_active">Briar està connectat a Bluetooth</string>
+  <string name="bt_plugin_status_inactive">Briar no pot connectar-se a Bluetooth</string>
+  <string name="bt_plugin_status_disabled">Briar està configurat per a no emprar Bluetooth</string>
   <!--Notifications-->
   <string name="reminder_notification_title">Heu sortit de Briar</string>
   <string name="reminder_notification_text">Toqueu per a reiniciar la sessió.</string>
@@ -112,7 +136,7 @@
   <string name="fix">Corregeix</string>
   <string name="help">Ajuda</string>
   <string name="sorry">Ens sap greu</string>
-  <string name="error_start_activity">No disponible al vostre sistema</string>
+  <string name="error_start_activity">No està disponible en el vostre sistema</string>
   <string name="status_heading">Estat</string>
   <!--Contacts and Private Conversations-->
   <string name="no_contacts">No hi ha cap contacte per mostrar</string>
@@ -128,16 +152,16 @@
   <string name="set_contact_alias">Canvia el nom del contacte</string>
   <string name="set_contact_alias_hint">Nom del contacte</string>
   <string name="set_alias_button">Canvia</string>
-  <string name="delete_all_messages">Suprimeix tots els missatges</string>
-  <string name="dialog_title_delete_all_messages">Confirmeu la supressió dels missatges</string>
-  <string name="dialog_message_delete_all_messages">Esteu segur que voleu suprimir tots els missatges?</string>
-  <string name="dialog_title_not_all_messages_deleted">No s\'ha pogut suprimir tots els missatges</string>
-  <string name="dialog_message_not_deleted_ongoing_both">Els missatges relacionats amb introduccions i invitacions pendents no es poden suprimir fins que es finalitzin.</string>
-  <string name="dialog_message_not_deleted_ongoing_introductions">Els missatges relacionats amb introduccions pendents no es poden suprimir fins que es finalitzin.</string>
-  <string name="dialog_message_not_deleted_ongoing_invitations">Els missatges relacionats amb invitacions pendents no es poden suprimir fins que es finalitzin.</string>
+  <string name="delete_all_messages">Esborra tots els missatges</string>
+  <string name="dialog_title_delete_all_messages">Confirmeu l\'esborrat dels missatges</string>
+  <string name="dialog_message_delete_all_messages">Segur que voleu esborrar tots els missatges?</string>
+  <string name="dialog_title_not_all_messages_deleted">No s\'han pogut esborrar tots els missatges</string>
+  <string name="dialog_message_not_deleted_ongoing_both">Els missatges relacionats amb presentacions i invitacions pendents no es poden suprimir fins que finalitzen.</string>
+  <string name="dialog_message_not_deleted_ongoing_introductions">Els missatges relacionats amb presentacions pendents no es poden suprimir fins que finalitzen.</string>
+  <string name="dialog_message_not_deleted_ongoing_invitations">Els missatges relacionats amb invitacions pendents no es poden suprimir fins que finalitzen.</string>
   <string name="dialog_message_not_deleted_partly_downloaded">Els missatges baixats parcialment no es poden suprimir fins que s\'acabin de baixar.</string>
-  <string name="dialog_message_not_deleted_not_all_selected_both">Per a suprimir una invitació o una introducció, cal que seleccioneu la sol·licitdu i la resposta.</string>
-  <string name="dialog_message_not_deleted_not_all_selected_introductions">Per a suprimir una introducció, cal que seleccioneu la sol·licitud i la resposta.</string>
+  <string name="dialog_message_not_deleted_not_all_selected_both">Per a suprimir una invitació o una presentació, cal que seleccioneu la sol·licitud i la resposta.</string>
+  <string name="dialog_message_not_deleted_not_all_selected_introductions">Per a suprimir una presentació, cal que seleccioneu la sol·licitud i la resposta.</string>
   <string name="dialog_message_not_deleted_not_all_selected_invitations">Per a suprimir una invitació, cal que seleccioneu la sol·licitud i la resposta.</string>
   <string name="delete_contact">Suprimeix aquest contacte</string>
   <string name="dialog_title_delete_contact">Confirmeu la supressió del contacte</string>
@@ -172,7 +196,6 @@ Així que l\'actualitzi li veureu una icona diferent .</string>
   <string name="connecting_to_device">Connectant-se al dispositiu\u2026</string>
   <string name="authenticating_with_device">Autenticant-se amb el dispositiu\u2026</string>
   <string name="connection_error_title">No ha pogut connectar-se al vostre contacte</string>
-  <string name="connection_error_explanation">Comproveu que esteu connectats a la mateixa xarxa Wi-Fi.</string>
   <string name="connection_error_feedback">Si aquest problema persisteix, <a href="feedback">envieu-nos un comentari</a> per ajudar-nos a millorar l\'aplicació.</string>
   <!--Adding Contacts Remotely-->
   <string name="add_contact_remotely_title_case">Afegeix un contacte llunyà</string>
@@ -413,10 +436,20 @@ Així que l\'actualitzi li veureu una icona diferent .</string>
   <string name="pref_theme_auto">Automàtic (segons l\'hora)</string>
   <string name="pref_theme_system">Valor per defecte del sistema</string>
   <!--Settings Connections-->
+  <string name="network_settings_title">Connexions</string>
+  <string name="bluetooth_setting">Connectat als contactes via Bluetooth</string>
+  <string name="wifi_setting">Connectat als contactes en la mateixa xarxa WiFi</string>
+  <string name="tor_enable_title">Connectat als contactes via Internet</string>
+  <string name="tor_enable_summary">Totes les connexions van via la xarxa Tor per augmentar privacitat</string>
+  <string name="tor_network_setting">Mètode de connexió per a la xarxa Tor</string>
   <string name="tor_network_setting_automatic">Automàtic, basat en la posició</string>
+  <string name="tor_network_setting_without_bridges">Usa la xarxa Tor sense ponts</string>
+  <string name="tor_network_setting_with_bridges">Usa la xarxa Tor amb ponts</string>
+  <string name="tor_network_setting_never">No connectis a Internet</string>
   <!--How and when Briar will connect to Tor: E.g. "Don't connect to the Internet (in China)" or "Use Tor network with bridges (in Belarus)"-->
   <string name="tor_network_setting_summary">Automàtic: %1$s (a %2$s)</string>
   <string name="tor_mobile_data_title">Usa dades mòbils</string>
+  <string name="tor_only_when_charging_title">Només connecta\'t a Internet mentre s\'està carregant </string>
   <string name="tor_only_when_charging_summary">Desactiva la connexió a Internet quan el dispositiu estigui funcionant amb la bateria</string>
   <!--Settings Security and Panic-->
   <string name="security_settings_title">Seguretat</string>
@@ -527,6 +560,7 @@ Així que l\'actualitzi li veureu una icona diferent .</string>
   <string name="lock_is_locked">Briar està bloquejat</string>
   <string name="lock_tap_to_unlock">Toqueu per desbloquejar-lo</string>
   <!--Connections Screen-->
+  <string name="transports_help_text">Briar pot contactar els vostres contactes via Internet, WiFi o Bluetooth.\n\nTotes les connexions d\'Internet van via la xarxa Tor per privacitat.\n\nSi es pot arribar a un contacte per diversos mètodes, Briar els usa tots simultàniament.</string>
   <!--Screenshots-->
   <!--This is a name to be used in screenshots. Feel free to change it to a local name.-->
   <string name="screenshot_alice">Alba</string>

briar-android/src/main/res/values-de/strings.xml

@@ -195,7 +195,6 @@
   <string name="connecting_to_device">Verbinde mit Gerät\u2026</string>
   <string name="authenticating_with_device">Authentifiziere Gerät\u2026</string>
   <string name="connection_error_title">Keine Verbindung zum Kontakt</string>
-  <string name="connection_error_explanation">Überprüfe, ob ihr beide mit demselben WLAN-Netzwerk verbunden seid.</string>
   <string name="connection_error_feedback">Wenn das Problem weiterbesteht, hilf uns die App zu verbessern und <a href="feedback">schicke Feedback</a>.</string>
   <!--Adding Contacts Remotely-->
   <string name="add_contact_remotely_title_case">Kontakt aus der Ferne hinzufügen</string>
@@ -550,6 +549,7 @@
   <string name="permission_camera_location_title">Kamera und Standort</string>
   <string name="permission_camera_location_request_body">Um den QR-Code zu scannen, braucht Briar Zugriff auf die Kamera.\n\nUm Bluetooth-Geräte zu finden, braucht Briar Zugriff auf deinen Standort.\n\nBriar speichert weder deinen Standort noch gibt es ihn an andere weiter.</string>
   <string name="permission_camera_denied_body">Du hast den Zugriff auf die Kamera verweigert, aber das Hinzufügen von Kontakten erfordert die Verwendung der Kamera.\n\nBitte gewähre den Zugriff.</string>
+  <string name="permission_location_denied_body">Du hast den Zugriff auf deinen Standort verweigert, aber Briar benötigt diese Berechtigung, um Bluetooth-Geräte zu erkennen.\n\nBitte gewähre den Zugriff.</string>
   <string name="qr_code">QR-Code</string>
   <string name="show_qr_code_fullscreen">QR-Code im Vollbildmodus anzeigen</string>
   <!--App Locking-->

briar-android/src/main/res/values-es/strings.xml

@@ -195,7 +195,6 @@
   <string name="connecting_to_device">Conectando al dispositivo\u2026</string>
   <string name="authenticating_with_device">Autentificándose con el dispositivo\u2026</string>
   <string name="connection_error_title">No se pudo conectar a tu contacto</string>
-  <string name="connection_error_explanation">Por favor comprobar que ambos estén conectados a la misma red Wi-Fi.</string>
   <string name="connection_error_feedback">Si este problema persiste, por favor <a href="feedback">envía tus comentarios</a> para ayudarnos a mejorar la aplicación.</string>
   <!--Adding Contacts Remotely-->
   <string name="add_contact_remotely_title_case">Añadir un Contacto a Distancia</string>
@@ -550,6 +549,7 @@
   <string name="permission_camera_location_title">Cámara y ubicación</string>
   <string name="permission_camera_location_request_body">Para escanear el código QR, Briar necesita acceso a la cámara.\n\nPara descubrir dispositivos Bluetooth, Briar necesita permiso para acceder tu ubicación.\n\nBriar no la almacena o la comparte con nadie.</string>
   <string name="permission_camera_denied_body">Has denegado el acceso a la cámara, pero para añadir contactos se requiere el uso de la cámara.\n\nPor favor considera la posibilidad de conceder el acceso.</string>
+  <string name="permission_location_denied_body">Has denegado el acceso a tu ubicación, pero Briar necesita este permiso para descubrir dispositivos Bluetooth.\n\nPor favor considera la posibilidad de conceder el acceso.</string>
   <string name="qr_code">Código QR</string>
   <string name="show_qr_code_fullscreen">Mostrar código QR a pantalla completa</string>
   <!--App Locking-->

briar-android/src/main/res/values-eu/strings.xml

@@ -171,7 +171,6 @@
   <string name="connecting_to_device">Gailura konektatzen\u2026</string>
   <string name="authenticating_with_device">Gailuarekin autentifikatzen\u2026</string>
   <string name="connection_error_title">Ezin izan da zure kontaktuarekin konektatu</string>
-  <string name="connection_error_explanation">Egiaztatu biak Wi-Fi sare berera konektatuta zaudetela.</string>
   <string name="connection_error_feedback">Arazoa  mantentzen bada, mesedez <a href="feedback">bidali iruzkin bat</a> aplikazioa hobetzen laguntzeko.</string>
   <!--Adding Contacts Remotely-->
   <string name="add_contact_remotely_title_case">Gehitu urruneko kontaktua</string>

briar-android/src/main/res/values-fa/strings.xml

@@ -69,10 +69,21 @@
   <string name="sign_out_button">خروج</string>
   <!--Transports: Tor-->
   <string name="transport_tor">اینترنت</string>
+  <string name="tor_plugin_status_enabling">Briar در حال اتصال به اینترنت می باشد</string>
+  <string name="tor_plugin_status_active">Briar به اینترنت متصل شد</string>
+  <string name="tor_plugin_status_inactive">Briar نمی تواند به اینترنت متصل شود</string>
   <!--Transports: Wi-Fi-->
   <string name="transport_lan">وای فای</string>
+  <string name="transport_lan_long">همان شبکه وای-فای</string>
+  <string name="lan_device_status_on">موبایل شما به وای-فای وصل می باشد</string>
+  <string name="lan_device_status_off">موبایل شما به وای-فای وصل نیست</string>
+  <string name="lan_plugin_status_enabling">Briar در حال اتصال به شبکه وای-فای می باشد</string>
   <!--Transports: Bluetooth-->
   <string name="transport_bt">بلوتوث</string>
+  <string name="bt_device_status_on">بلوتوث موبایل شما روشن می باشد</string>
+  <string name="bt_device_status_off">بلوتوث موبایل شما خاموش می باشد</string>
+  <string name="bt_plugin_status_inactive">Briar نمی تواند به بلوتوث وصل شود</string>
+  <string name="bt_plugin_status_disabled">Briar طوری پیکربندی شده که از بلوتوث استفاده نکند</string>
   <!--Notifications-->
   <string name="reminder_notification_title">از Briar (برایر) خارج شد</string>
   <string name="reminder_notification_text">برای وارد شدن دوباره ضربه بزنید.</string>
@@ -185,7 +196,6 @@
   <string name="connecting_to_device">اتصال به دستگاهu2026\</string>
   <string name="authenticating_with_device">تصدیق سازی با دستگاه u2026\</string>
   <string name="connection_error_title">اتصال به مخاطب شما برقرار نشد</string>
-  <string name="connection_error_explanation">لطفا مطمئن شوید که هر دو شما به شبکه وای فای یکسان متصل هستید.</string>
   <string name="connection_error_feedback">اگر این مشکل ادامه پیدا کرد، لطفا <a href="feedback">بازخورد ارسال کنید</a> تا به ما در بهبود برنامه کمک کنید.</string>
   <!--Adding Contacts Remotely-->
   <string name="add_contact_remotely_title_case">افزودن مخاطب از دور</string>

briar-android/src/main/res/values-fr/strings.xml

@@ -195,7 +195,6 @@
   <string name="connecting_to_device">Connexion à l’appareil\u2026</string>
   <string name="authenticating_with_device">Autentification avec l’appareil\u2026</string>
   <string name="connection_error_title">Impossible de se connecter à votre contact</string>
-  <string name="connection_error_explanation">Veuillez vérifier que vous êtes connecté au même réseau Wi-Fi.</string>
   <string name="connection_error_feedback">Si le problème persiste, veuillez nous <a href="feedback">envoyer une rétroaction</a> pour nous aider à améliorer l\'appli.</string>
   <!--Adding Contacts Remotely-->
   <string name="add_contact_remotely_title_case">Ajouter un contact éloigné</string>
@@ -550,6 +549,7 @@
   <string name="permission_camera_location_title">Appareil photo et position</string>
   <string name="permission_camera_location_request_body">Afin de balayer le code QR, Briar doit accéder à l’appareil photo.\n\nAfin de découvrir des périphériques Bluetooth, Briar doit accéder à votre position.\n\nBriar n’enregistre pas votre position et ne la partage avec personne.</string>
   <string name="permission_camera_denied_body">Vous avez refusé l’accès à la caméra, mais l’ajout de contacts exige l’utilisation de celle-ci.\n\nVeuillez envisager d’y accorder l’accès.</string>
+  <string name="permission_location_denied_body">Vous avez refusé l’accès à votre position géographique, mais Briar en a besoin pour découvrir les appareils Bluetooth.\n\nVeuillez envisager d’y accorder l’accès.</string>
   <string name="qr_code">Code QR</string>
   <string name="show_qr_code_fullscreen">Afficher le code QR en plein écran</string>
   <!--App Locking-->

briar-android/src/main/res/values-gl/strings.xml

@@ -195,7 +195,6 @@
   <string name="connecting_to_device">Conectando co dispositivo\u2026</string>
   <string name="authenticating_with_device">Autenticándose co dispositivo\u2026</string>
   <string name="connection_error_title">Non se puido conectar co contacto</string>
-  <string name="connection_error_explanation">Por favor, comprobe que ambas están conectadas a mesma rede Wi-Fi.</string>
   <string name="connection_error_feedback">Si persiste o problema,<a href="feedback">envíe un informe</a> para axudarnos a mellorar a app.</string>
   <!--Adding Contacts Remotely-->
   <string name="add_contact_remotely_title_case">Engadir contacto a distancia</string>
@@ -550,6 +549,7 @@
   <string name="permission_camera_location_title">Cámara e localización</string>
   <string name="permission_camera_location_request_body">Para escanear o código QR, Briar precisa acceso a cámara.\n\nPara descubrir dispositivos Bluetooth, Briar precisa permiso a súa localización.\n\nBriar non garda a súa localización nin a comparte con ninguén.</string>
   <string name="permission_camera_denied_body">Denegou o permiso de acceso a cámara, pero é necesario para engadir contactos.\n\nPor favor, considere conceder o permiso.</string>
+  <string name="permission_location_denied_body">Denegache o acceso á localización, mais Briar precisa este permiso para descubrir dispositivos Bluetooth.\n\nConsidera conceder o permiso.</string>
   <string name="qr_code">Código QR</string>
   <string name="show_qr_code_fullscreen">Amosar o código QR a pantalla completa</string>
   <!--App Locking-->

briar-android/src/main/res/values-he/strings.xml

@@ -63,12 +63,36 @@
   <string name="lock_button">נעל יישום</string>
   <string name="settings_button">הגדרות</string>
   <string name="sign_out_button">התנתק</string>
+  <string name="transports_onboarding_text">הקש כאן כדי לשלוט איך Briar מתחבר אל אנשי הקשר שלך.</string>
   <!--Transports: Tor-->
   <string name="transport_tor">אינטרנט</string>
+  <string name="tor_device_status_online_wifi">לטלפון שלך יש גישת אינטרנט באמצעות Wi-Fi</string>
+  <string name="tor_device_status_online_mobile">לטלפון שלך יש חיבור אינטרנט באמצעות נתונים סלולריים</string>
+  <string name="tor_device_status_offline">לטלפון שלך אין גישת אינטרנט</string>
+  <string name="tor_plugin_status_enabling">Briar מתחבר אל האינטרנט</string>
+  <string name="tor_plugin_status_active">Briar מחובר אל האינטרנט</string>
+  <string name="tor_plugin_status_inactive">Briar אינו יכול להתחבר אל האינטרנט</string>
+  <string name="tor_plugin_status_disabled">Briar מתוצר לא להשתמש באינטרנט</string>
+  <string name="tor_plugin_status_disabled_mobile_data">Briar מתוצר לא להשתמש בנתונים סלולריים</string>
+  <string name="tor_plugin_status_disabled_battery">Briar מתוצר לא להשתמש באינטרנט בעת הרצה על סוללה</string>
+  <string name="tor_plugin_status_disabled_country_blocked">Briar מתוצר לא להשתמש באינטרנט במדינה זו</string>
   <!--Transports: Wi-Fi-->
   <string name="transport_lan">Wi-Fi</string>
+  <string name="transport_lan_long">אותה רשת Wi-Fi</string>
+  <string name="lan_device_status_on">הטלפון שלך מחובר אל Wi-Fi</string>
+  <string name="lan_device_status_off">הטלפון שלך אינו מחובר אל Wi-Fi</string>
+  <string name="lan_plugin_status_enabling">Briar מתחבר אל רשת ה־Wi-Fi</string>
+  <string name="lan_plugin_status_active">Briar מחובר אל רשת ה־Wi-Fi</string>
+  <string name="lan_plugin_status_inactive">Briar אינו יכול להתחבר אל רשת ה־Wi-Fi</string>
+  <string name="lan_plugin_status_disabled">Briar מתוצר לא להשתמש ברשת ה־Wi-Fi</string>
   <!--Transports: Bluetooth-->
-  <string name="transport_bt">שן כחולה</string>
+  <string name="transport_bt">Bluetooth</string>
+  <string name="bt_device_status_on">Bluetooth של הטלפון שלך מופעל</string>
+  <string name="bt_device_status_off">Bluetooth של הטלפון שלך מכובה</string>
+  <string name="bt_plugin_status_enabling">Briar מתחבר אל Bluetooth</string>
+  <string name="bt_plugin_status_active">Briar מחובר אל Bluetooth</string>
+  <string name="bt_plugin_status_inactive">Briar אינו יכול להתחבר אל Bluetooth</string>
+  <string name="bt_plugin_status_disabled">Briar מתוצר לא להשתמש ב־Bluetooth</string>
   <!--Notifications-->
   <string name="reminder_notification_title">נותקת מן Briar</string>
   <string name="reminder_notification_text">הקש כדי להתחבר חזרה.</string>
@@ -181,7 +205,6 @@
   <string name="connecting_to_device">מתחבר אל מכשיר\u2026</string>
   <string name="authenticating_with_device">מזדהה מול המכשיר\u2026</string>
   <string name="connection_error_title">לא היה ניתן להתחבר אל איש הקשר שלך</string>
-  <string name="connection_error_explanation">אנא בדוק ששניכם מחוברים אל אותה רשת Wi-Fi.</string>
   <string name="connection_error_feedback">אם בעיה נמשכת, אנא <a href="feedback">שלח משוב</a> כדי לעזור לנו לשפר את היישום.</string>
   <!--Adding Contacts Remotely-->
   <string name="add_contact_remotely_title_case">הוסף איש קשר בקרבה</string>
@@ -436,10 +459,20 @@
   <string name="pref_theme_auto">אוטומטי (שעות יום)</string>
   <string name="pref_theme_system">ברירת מחדל</string>
   <!--Settings Connections-->
+  <string name="network_settings_title">חיבורים</string>
+  <string name="bluetooth_setting">התחבר אל אנשי קשר באמצעות Bluetooth</string>
+  <string name="wifi_setting">התחבר אל אנשי קשר באותה רשת Wi-Fi</string>
+  <string name="tor_enable_title">התחבר אל אנשי קשר באמצעות האינטרנט</string>
+  <string name="tor_enable_summary">כל החיבורים עוברים דרך רשת Tor למען פרטיות</string>
+  <string name="tor_network_setting">שיטת חיבור עבור רשת Tor</string>
   <string name="tor_network_setting_automatic">אוטומטי על סמך מיקום</string>
+  <string name="tor_network_setting_without_bridges">השתמש ברשת Tor בלי גשרים</string>
+  <string name="tor_network_setting_with_bridges">השתמש ברשת Tor עם גשרים</string>
+  <string name="tor_network_setting_never">אל תתחבר אל האינטרנט</string>
   <!--How and when Briar will connect to Tor: E.g. "Don't connect to the Internet (in China)" or "Use Tor network with bridges (in Belarus)"-->
   <string name="tor_network_setting_summary">אוטומטי: %1$s (תוך %2$s)</string>
   <string name="tor_mobile_data_title">השתמש בנתונים סלולריים</string>
+  <string name="tor_only_when_charging_title">התחבר אל האינטרנט רק בעת טעינה</string>
   <string name="tor_only_when_charging_summary">משבית חיבור אינטרנט כשהמכשיר עובד על סוללה</string>
   <!--Settings Security and Panic-->
   <string name="security_settings_title">אבטחה</string>
@@ -536,7 +569,7 @@
   <string name="permission_camera_title">הרשאת מצלמה</string>
   <string name="permission_camera_request_body">כדי לסרוק את קוד ה־QR, היישום Briar צריך גישה אל המצלמה.</string>
   <string name="permission_location_title">הרשאת מיקום</string>
-  <string name="permission_location_request_body">כדי לגלות מכשירי שן־כחולה, Briar צריך הרשאה להשיג גישה אל מיקומך.\n\nBriar אינו מאחסן את מיקומך או משתף אותו עם אף אחד.</string>
+  <string name="permission_location_request_body">כדי לגלות מכשירי Bluetooth, היישום Briar צריך הרשאה להשיג גישה אל מיקומך.\n\nBriar אינו מאחסן את מיקומך או משתף אותו עם אף אחד.</string>
   <string name="permission_camera_location_title">מצלמה ומיקום</string>
   <string name="permission_camera_location_request_body">כדי לסרוק את קוד ה־QR, היישום Briar צריך הרשאה אל המצלמה.\n\nכדי לגלות מכשירי שן־כחולה, Briar צריך הרשאה להשיג גישה אל מיקומך.\n\nBriar אינו מאחסן את מיקומך או משתף אותו עם אף אחד.</string>
   <string name="permission_camera_denied_body">דחית גישה אל המצלמה, אבל הוספת אנשי קשר דורשת שימוש במצלמה.\n\nאנא שקול הענקת גישה.</string>
@@ -550,6 +583,7 @@
   <string name="lock_is_locked">Briar נעול</string>
   <string name="lock_tap_to_unlock">הקש כדי לבטל נעילה</string>
   <!--Connections Screen-->
+  <string name="transports_help_text">Briar יכול להתחבר אל אנשי הקשר שלך באמצעות האינטרנט, Wi-Fi או Bluetooth.\n\nכל חיבורי האינטרנט עוברים דרך רשת Tor למען פרטיות.\n\nאם איש קשר ניתן להשגה באמצעות שיטות רבות, Briar משתמש בהן במקביל.</string>
   <!--Screenshots-->
   <!--This is a name to be used in screenshots. Feel free to change it to a local name.-->
   <string name="screenshot_alice">נועה</string>

briar-android/src/main/res/values-hi/strings.xml

@@ -154,7 +154,6 @@
   <string name="connecting_to_device">उपकरण \ u2026 से कनेक्ट हो रहा है</string>
   <string name="authenticating_with_device">डिवाइस के साथ प्रमाणीकरण \ u2026</string>
   <string name="connection_error_title">आपके संपर्क से कनेक्ट नहीं हो सका</string>
-  <string name="connection_error_explanation">कृपया जांचें कि आप दोनों एक ही वाई-फाई नेटवर्क से जुड़े हुए हैं।</string>
   <string name="connection_error_feedback">यदि यह समस्या बनी रहती है, तो कृपया ऐप को बेहतर बनाने में हमारी सहायता के लिए <a href="feedback">फ़ीडबैक भेजें</a>।</string>
   <!--Adding Contacts Remotely-->
   <string name="add_contact_remotely_title_case">दूरी वाले संपर्क जोड़ें</string>