Bump version numbers for 1.2.13 release.

Do not produce malformed links for adding contacts when on other locales such as Turkish

Closes #1885

See merge request briar/briar!1335

.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/src/main/java/org/briarproject/bramble/network/AndroidNetworkManager.java

@@ -1,11 +1,15 @@
 package org.briarproject.bramble.network;
 
+import android.annotation.TargetApi;
 import android.app.Application;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.net.ConnectivityManager;
+import android.net.LinkAddress;
+import android.net.LinkProperties;
+import android.net.Network;
 import android.net.NetworkInfo;
 
 import org.briarproject.bramble.api.event.EventBus;
@@ -19,6 +23,11 @@ import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.system.TaskScheduler;
 import org.briarproject.bramble.api.system.TaskScheduler.Cancellable;
 
+import java.net.Inet4Address;
+import java.net.InetAddress;
+import java.net.NetworkInterface;
+import java.net.SocketException;
+import java.util.Enumeration;
 import java.util.concurrent.Executor;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
@@ -36,16 +45,22 @@ import static android.net.ConnectivityManager.TYPE_WIFI;
 import static android.net.wifi.p2p.WifiP2pManager.WIFI_P2P_THIS_DEVICE_CHANGED_ACTION;
 import static android.os.Build.VERSION.SDK_INT;
 import static android.os.PowerManager.ACTION_DEVICE_IDLE_MODE_CHANGED;
+import static java.net.NetworkInterface.getNetworkInterfaces;
+import static java.util.Collections.list;
 import static java.util.concurrent.TimeUnit.MINUTES;
 import static java.util.concurrent.TimeUnit.SECONDS;
 import static java.util.logging.Level.INFO;
+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;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 class AndroidNetworkManager implements NetworkManager, Service {
 
 	private static final Logger LOG =
-			Logger.getLogger(AndroidNetworkManager.class.getName());
+			getLogger(AndroidNetworkManager.class.getName());
 
 	// See android.net.wifi.WifiManager
 	private static final String WIFI_AP_STATE_CHANGED_ACTION =
@@ -54,7 +69,8 @@ class AndroidNetworkManager implements NetworkManager, Service {
 	private final TaskScheduler scheduler;
 	private final EventBus eventBus;
 	private final Executor eventExecutor;
-	private final Context appContext;
+	private final Application app;
+	private final ConnectivityManager connectivityManager;
 	private final AtomicReference<Cancellable> connectivityCheck =
 			new AtomicReference<>();
 	private final AtomicBoolean used = new AtomicBoolean(false);
@@ -67,7 +83,9 @@ class AndroidNetworkManager implements NetworkManager, Service {
 		this.scheduler = scheduler;
 		this.eventBus = eventBus;
 		this.eventExecutor = eventExecutor;
-		this.appContext = app.getApplicationContext();
+		this.app = app;
+		connectivityManager = (ConnectivityManager)
+				requireNonNull(app.getSystemService(CONNECTIVITY_SERVICE));
 	}
 
 	@Override
@@ -82,24 +100,82 @@ class AndroidNetworkManager implements NetworkManager, Service {
 		filter.addAction(WIFI_AP_STATE_CHANGED_ACTION);
 		filter.addAction(WIFI_P2P_THIS_DEVICE_CHANGED_ACTION);
 		if (SDK_INT >= 23) filter.addAction(ACTION_DEVICE_IDLE_MODE_CHANGED);
-		appContext.registerReceiver(networkStateReceiver, filter);
+		app.registerReceiver(networkStateReceiver, filter);
 	}
 
 	@Override
 	public void stopService() {
 		if (networkStateReceiver != null)
-			appContext.unregisterReceiver(networkStateReceiver);
+			app.unregisterReceiver(networkStateReceiver);
 	}
 
 	@Override
 	public NetworkStatus getNetworkStatus() {
-		ConnectivityManager cm = (ConnectivityManager)
-				appContext.getSystemService(CONNECTIVITY_SERVICE);
-		if (cm == null) throw new AssertionError();
-		NetworkInfo net = cm.getActiveNetworkInfo();
+		NetworkInfo net = connectivityManager.getActiveNetworkInfo();
 		boolean connected = net != null && net.isConnected();
-		boolean wifi = connected && net.getType() == TYPE_WIFI;
-		return new NetworkStatus(connected, wifi);
+		boolean wifi = false, ipv6Only = false;
+		if (connected) {
+			wifi = net.getType() == TYPE_WIFI;
+			if (SDK_INT >= 23) ipv6Only = isActiveNetworkIpv6Only();
+			else ipv6Only = areAllAvailableNetworksIpv6Only();
+		}
+		return new NetworkStatus(connected, wifi, ipv6Only);
+	}
+
+	/**
+	 * Returns true if the
+	 * {@link ConnectivityManager#getActiveNetwork() active network} has an
+	 * IPv6 unicast address and no IPv4 addresses. The active network is
+	 * assumed not to be a loopback interface.
+	 */
+	@TargetApi(23)
+	private boolean isActiveNetworkIpv6Only() {
+		Network net = connectivityManager.getActiveNetwork();
+		if (net == null) {
+			LOG.info("No active network");
+			return false;
+		}
+		LinkProperties props = connectivityManager.getLinkProperties(net);
+		if (props == null) {
+			LOG.info("No link properties for active network");
+			return false;
+		}
+		boolean hasIpv6Unicast = false;
+		for (LinkAddress linkAddress : props.getLinkAddresses()) {
+			InetAddress addr = linkAddress.getAddress();
+			if (addr instanceof Inet4Address) return false;
+			if (!addr.isMulticastAddress()) hasIpv6Unicast = true;
+		}
+		return hasIpv6Unicast;
+	}
+
+	/**
+	 * Returns true if the device has at least one network interface with an
+	 * IPv6 unicast address and no interfaces with IPv4 addresses, excluding
+	 * loopback interfaces and interfaces that are
+	 * {@link NetworkInterface#isUp() down}. If this method returns true and
+	 * the device has internet access then it's via IPv6 only.
+	 */
+	private boolean areAllAvailableNetworksIpv6Only() {
+		try {
+			Enumeration<NetworkInterface> interfaces = getNetworkInterfaces();
+			if (interfaces == null) {
+				LOG.info("No network interfaces");
+				return false;
+			}
+			boolean hasIpv6Unicast = false;
+			for (NetworkInterface i : list(interfaces)) {
+				if (i.isLoopback() || !i.isUp()) continue;
+				for (InetAddress addr : list(i.getInetAddresses())) {
+					if (addr instanceof Inet4Address) return false;
+					if (!addr.isMulticastAddress()) hasIpv6Unicast = true;
+				}
+			}
+			return hasIpv6Unicast;
+		} catch (SocketException e) {
+			logException(LOG, WARNING, e);
+			return false;
+		}
 	}
 
 	private void updateConnectionStatus() {

bramble-android/src/main/java/org/briarproject/bramble/system/AndroidSecureRandomProvider.java

@@ -6,8 +6,6 @@ import android.bluetooth.BluetoothAdapter;
 import android.bluetooth.BluetoothDevice;
 import android.content.ContentResolver;
 import android.content.Context;
-import android.net.wifi.WifiConfiguration;
-import android.net.wifi.WifiManager;
 import android.os.Build;
 import android.os.Parcel;
 import android.os.StrictMode;
@@ -17,12 +15,10 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
 import java.io.DataOutputStream;
 import java.io.IOException;
-import java.util.List;
 
 import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 
-import static android.content.Context.WIFI_SERVICE;
 import static android.os.Build.VERSION.SDK_INT;
 import static android.provider.Settings.Secure.ANDROID_ID;
 
@@ -52,15 +48,6 @@ class AndroidSecureRandomProvider extends UnixSecureRandomProvider {
 		String id = Settings.Secure.getString(contentResolver, ANDROID_ID);
 		if (id != null) out.writeUTF(id);
 		Parcel parcel = Parcel.obtain();
-		WifiManager wm = (WifiManager) appContext.getApplicationContext()
-				.getSystemService(WIFI_SERVICE);
-		if (wm != null) {
-			List<WifiConfiguration> configs = wm.getConfiguredNetworks();
-			if (configs != null) {
-				for (WifiConfiguration config : configs)
-					parcel.writeParcelable(config, 0);
-			}
-		}
 		BluetoothAdapter bt = BluetoothAdapter.getDefaultAdapter();
 		if (bt != null) {
 			for (BluetoothDevice device : bt.getBondedDevices())

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',
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-        '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/network/NetworkStatus.java

@@ -8,11 +8,12 @@ import javax.annotation.concurrent.Immutable;
 @NotNullByDefault
 public class NetworkStatus {
 
-	private final boolean connected, wifi;
+	private final boolean connected, wifi, ipv6Only;
 
-	public NetworkStatus(boolean connected, boolean wifi) {
+	public NetworkStatus(boolean connected, boolean wifi, boolean ipv6Only) {
 		this.connected = connected;
 		this.wifi = wifi;
+		this.ipv6Only = ipv6Only;
 	}
 
 	public boolean isConnected() {
@@ -22,4 +23,8 @@ public class NetworkStatus {
 	public boolean isWifi() {
 		return wifi;
 	}
+
+	public boolean isIpv6Only() {
+		return ipv6Only;
+	}
 }

bramble-api/src/main/java/org/briarproject/bramble/api/reporting/DevReporter.java

@@ -23,6 +23,8 @@ public interface DevReporter {
 
 	/**
 	 * Sends any reports previously stored on disk.
+	 *
+	 * @return The number of reports that were sent.
 	 */
-	void sendReports();
+	int sendReports();
 }

bramble-core/src/main/java/org/briarproject/bramble/contact/PendingContactFactoryImpl.java

@@ -11,6 +11,7 @@ import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.util.Base32;
 
 import java.security.GeneralSecurityException;
+import java.util.Locale;
 import java.util.regex.Matcher;
 
 import javax.inject.Inject;
@@ -52,7 +53,7 @@ class PendingContactFactoryImpl implements PendingContactFactory {
 		byte[] raw = new byte[RAW_LINK_BYTES];
 		raw[0] = FORMAT_VERSION;
 		arraycopy(encoded, 0, raw, 1, encoded.length);
-		return "briar://" + Base32.encode(raw).toLowerCase();
+		return "briar://" + Base32.encode(raw).toLowerCase(Locale.US);
 	}
 
 	private PublicKey parseHandshakeLink(String link) throws FormatException {

bramble-core/src/main/java/org/briarproject/bramble/plugin/tor/TorPlugin.java

@@ -863,6 +863,7 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 			if (!state.isTorRunning()) return;
 			boolean online = status.isConnected();
 			boolean wifi = status.isWifi();
+			boolean ipv6Only = status.isIpv6Only();
 			String country = locationUtils.getCurrentCountry();
 			boolean blocked =
 					circumventionProvider.isTorProbablyBlocked(country);
@@ -879,7 +880,8 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 			boolean automatic = network == PREF_TOR_NETWORK_AUTOMATIC;
 
 			if (LOG.isLoggable(INFO)) {
-				LOG.info("Online: " + online + ", wifi: " + wifi);
+				LOG.info("Online: " + online + ", wifi: " + wifi
+						+ ", IPv6 only: " + ipv6Only);
 				if (country.isEmpty()) LOG.info("Country code unknown");
 				else LOG.info("Country code: " + country);
 				LOG.info("Charging: " + charging);
@@ -916,7 +918,8 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 					enableNetwork = true;
 					if (network == PREF_TOR_NETWORK_WITH_BRIDGES ||
 							(automatic && bridgesWork)) {
-						if (circumventionProvider.needsMeek(country)) {
+						if (ipv6Only ||
+								circumventionProvider.needsMeek(country)) {
 							LOG.info("Using meek bridges");
 							enableBridges = true;
 							useMeek = true;
@@ -942,6 +945,7 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				if (enableNetwork) {
 					enableBridges(enableBridges, useMeek);
 					enableConnectionPadding(enableConnectionPadding);
+					useIpv6(ipv6Only);
 				}
 				enableNetwork(enableNetwork);
 			} catch (IOException e) {
@@ -954,6 +958,11 @@ abstract class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		controlConnection.setConf("ConnectionPadding", enable ? "1" : "0");
 	}
 
+	private void useIpv6(boolean ipv6Only) throws IOException {
+		controlConnection.setConf("ClientUseIPv4", ipv6Only ? "0" : "1");
+		controlConnection.setConf("ClientUseIPv6", ipv6Only ? "1" : "0");
+	}
+
 	@ThreadSafe
 	@NotNullByDefault
 	protected class PluginState {

bramble-core/src/main/java/org/briarproject/bramble/reporting/DevReporterImpl.java

@@ -29,6 +29,7 @@ import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 import javax.net.SocketFactory;
 
+import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.IoUtils.tryToClose;
 
@@ -100,11 +101,12 @@ class DevReporterImpl implements DevReporter, EventListener {
 	}
 
 	@Override
-	public void sendReports() {
+	public int sendReports() {
 		File reportDir = devConfig.getReportDir();
 		File[] reports = reportDir.listFiles();
+		int reportsSent = 0;
 		if (reports == null || reports.length == 0)
-			return; // No reports to send
+			return reportsSent; // No reports to send
 
 		LOG.info("Sending reports to developers");
 		for (File f : reports) {
@@ -116,13 +118,15 @@ class DevReporterImpl implements DevReporter, EventListener {
 				in = new FileInputStream(f);
 				IoUtils.copyAndClose(in, out);
 				f.delete();
+				reportsSent++;
 			} catch (IOException e) {
 				LOG.log(WARNING, "Failed to send reports", e);
 				tryToClose(out, LOG, WARNING);
 				tryToClose(in, LOG, WARNING);
-				return;
+				return reportsSent;
 			}
 		}
-		LOG.info("Reports sent");
+		if (LOG.isLoggable(INFO)) LOG.info(reportsSent + " report(s) sent");
+		return reportsSent;
 	}
 }

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/src/main/java/org/briarproject/bramble/network/JavaNetworkManager.java

@@ -5,6 +5,8 @@ import org.briarproject.bramble.api.network.NetworkStatus;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 
+import java.net.Inet4Address;
+import java.net.InetAddress;
 import java.net.NetworkInterface;
 import java.net.SocketException;
 import java.util.Enumeration;
@@ -14,8 +16,8 @@ import javax.inject.Inject;
 
 import static java.net.NetworkInterface.getNetworkInterfaces;
 import static java.util.Collections.list;
-import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
 @MethodsNotNullByDefault
@@ -23,7 +25,7 @@ import static org.briarproject.bramble.util.LogUtils.logException;
 class JavaNetworkManager implements NetworkManager {
 
 	private static final Logger LOG =
-			Logger.getLogger(JavaNetworkManager.class.getName());
+			getLogger(JavaNetworkManager.class.getName());
 
 	@Inject
 	JavaNetworkManager() {
@@ -31,26 +33,28 @@ class JavaNetworkManager implements NetworkManager {
 
 	@Override
 	public NetworkStatus getNetworkStatus() {
-		boolean connected = false;
+		boolean connected = false, hasIpv4 = false, hasIpv6Unicast = false;
 		try {
 			Enumeration<NetworkInterface> interfaces = getNetworkInterfaces();
-			if (interfaces != null) {
+			if (interfaces == null) {
+				LOG.info("No network interfaces");
+			} else {
 				for (NetworkInterface i : list(interfaces)) {
-					if (i.isLoopback()) continue;
-					if (i.isUp() && i.getInetAddresses().hasMoreElements()) {
-						if (LOG.isLoggable(INFO)) {
-							LOG.info("Interface " + i.getDisplayName() +
-									" is up with at least one address.");
-						}
+					if (i.isLoopback() || !i.isUp()) continue;
+					for (InetAddress addr : list(i.getInetAddresses())) {
 						connected = true;
-						break;
+						if (addr instanceof Inet4Address) {
+							hasIpv4 = true;
+						} else if (!addr.isMulticastAddress()) {
+							hasIpv6Unicast = true;
+						}
 					}
 				}
 			}
 		} catch (SocketException e) {
 			logException(LOG, WARNING, e);
 		}
-		return new NetworkStatus(connected, false);
+		return new NetworkStatus(connected, false, !hasIpv4 && hasIpv6Unicast);
 	}
 
 }

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

@@ -93,20 +93,19 @@ 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'
 	implementation 'info.guardianproject.trustedintents:trustedintents:0.2'
 	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'
@@ -120,23 +119,24 @@ 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.arch.core:core-testing:2.1.0"
 	testImplementation "androidx.test.espresso:espresso-core:$espressoVersion"
 	testImplementation 'org.robolectric:robolectric:4.3.1'
 	testImplementation 'org.mockito:mockito-core:3.1.0'
-	testImplementation 'junit:junit:4.12'
+	testImplementation 'junit:junit:4.13.1'
 	testImplementation "org.jmock:jmock:$jmockVersion"
 	testImplementation "org.jmock:jmock-junit4:$jmockVersion"
 	testImplementation "org.jmock:jmock-legacy:$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

@@ -65,30 +65,43 @@
 
 		<service
 			android:name="org.briarproject.briar.android.NotificationCleanupService"
-			android:exported="false"></service>
+			android:exported="false" />
 
 		<activity
-			android:name="org.briarproject.briar.android.reporting.DevReportActivity"
+			android:name="org.briarproject.briar.android.reporting.CrashReportActivity"
 			android:excludeFromRecents="true"
 			android:exported="false"
 			android:finishOnTaskLaunch="true"
 			android:label="@string/crash_report_title"
 			android:launchMode="singleInstance"
+			android:process=":briar_error_handler"
 			android:theme="@style/BriarTheme.NoActionBar"
-			android:windowSoftInputMode="adjustResize|stateHidden"></activity>
+			android:windowSoftInputMode="adjustResize|stateHidden" />
+
+		<activity
+			android:name="org.briarproject.briar.android.reporting.FeedbackActivity"
+			android:exported="false"
+			android:label="@string/feedback_title"
+			android:parentActivityName="org.briarproject.briar.android.settings.SettingsActivity"
+			android:theme="@style/BriarTheme.NoActionBar"
+			android:windowSoftInputMode="adjustResize|stateHidden">
+			<meta-data
+				android:name="android.support.PARENT_ACTIVITY"
+				android:value="org.briarproject.briar.android.settings.SettingsActivity" />
+		</activity>
 
 		<activity
 			android:name="org.briarproject.briar.android.splash.ExpiredActivity"
-			android:label="@string/app_name"></activity>
+			android:label="@string/app_name" />
 
 		<activity
 			android:name="org.briarproject.briar.android.login.StartupActivity"
-			android:label="@string/app_name"></activity>
+			android:label="@string/app_name" />
 
 		<activity
 			android:name="org.briarproject.briar.android.account.SetupActivity"
 			android:label="@string/setup_title"
-			android:windowSoftInputMode="adjustResize|stateAlwaysVisible"></activity>
+			android:windowSoftInputMode="adjustResize|stateAlwaysVisible" />
 
 		<activity
 			android:name="org.briarproject.briar.android.splash.SplashScreenActivity"
@@ -346,7 +359,7 @@
 
 		<activity
 			android:name="org.briarproject.briar.android.StartupFailureActivity"
-			android:label="@string/startup_failed_activity_title"></activity>
+			android:label="@string/startup_failed_activity_title" />
 
 		<activity
 			android:name="org.briarproject.briar.android.settings.SettingsActivity"
@@ -412,11 +425,11 @@
 
 		<activity
 			android:name="org.briarproject.briar.android.logout.ExitActivity"
-			android:theme="@android:style/Theme.NoDisplay"></activity>
+			android:theme="@android:style/Theme.NoDisplay" />
 
 		<activity
 			android:name=".android.logout.HideUiActivity"
-			android:theme="@android:style/Theme.NoDisplay"></activity>
+			android:theme="@android:style/Theme.NoDisplay" />
 
 		<activity
 			android:name=".android.account.UnlockActivity"
@@ -436,4 +449,27 @@
 			android:theme="@style/BriarTheme" />
 
 	</application>
+
+	<queries>
+		<package android:name="info.guardianproject.ripple" />
+		<package android:name="com.huawei.systemmanager" />
+
+		<intent>
+			<action android:name="android.intent.action.VIEW" />
+			<data android:scheme="https" />
+		</intent>
+		<intent>
+			<action android:name="android.intent.action.VIEW" />
+			<data android:scheme="http" />
+		</intent>
+		<!-- white-listing the intents below does not seem necessary,
+		but they are still included in case modified Android versions require it -->
+		<intent>
+			<action android:name="android.bluetooth.adapter.action.REQUEST_DISCOVERABLE" />
+		</intent>
+		<intent>
+			<action android:name="android.settings.CHANNEL_NOTIFICATION_SETTINGS" />
+		</intent>
+	</queries>
+
 </manifest>

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;
@@ -33,7 +34,6 @@ import org.briarproject.briar.BriarCoreModule;
 import org.briarproject.briar.android.attachment.AttachmentModule;
 import org.briarproject.briar.android.conversation.glide.BriarModelLoader;
 import org.briarproject.briar.android.login.SignInReminderReceiver;
-import org.briarproject.briar.android.reporting.BriarReportSender;
 import org.briarproject.briar.android.view.EmojiTextInputView;
 import org.briarproject.briar.api.android.AndroidNotificationManager;
 import org.briarproject.briar.api.android.DozeWatchdog;
@@ -86,6 +86,8 @@ public interface AndroidComponent
 	@DatabaseExecutor
 	Executor databaseExecutor();
 
+	TransactionManager transactionManager();
+
 	MessageTracker messageTracker();
 
 	LifecycleManager lifecycleManager();
@@ -173,8 +175,6 @@ public interface AndroidComponent
 
 	void inject(BriarService briarService);
 
-	void inject(BriarReportSender briarReportSender);
-
 	void inject(NotificationCleanupService notificationCleanupService);
 
 	void inject(EmojiTextInputView textInputView);

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

@@ -109,7 +109,8 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 	@Nullable
 	private GroupId blockedGroup = null;
 	private boolean blockSignInReminder = false;
-	private boolean blockBlogs = false;
+	private boolean blockForums = false, blockGroups = false,
+			blockBlogs = false;
 	private long lastSound = 0;
 
 	private volatile Settings settings = new Settings();
@@ -223,8 +224,8 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 			if (s.getNamespace().equals(SETTINGS_NAMESPACE))
 				settings = s.getSettings();
 		} else if (e instanceof ConversationMessageReceivedEvent) {
-			ConversationMessageReceivedEvent p =
-					(ConversationMessageReceivedEvent) e;
+			ConversationMessageReceivedEvent<?> p =
+					(ConversationMessageReceivedEvent<?>) e;
 			showContactNotification(p.getContactId());
 		} else if (e instanceof GroupMessageAddedEvent) {
 			GroupMessageAddedEvent g = (GroupMessageAddedEvent) e;
@@ -385,6 +386,7 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 
 	@UiThread
 	private void showGroupMessageNotification(GroupId g) {
+		if (blockGroups) return;
 		if (g.equals(blockedGroup)) return;
 		groupCounts.add(g);
 		updateGroupMessageNotification(true);
@@ -452,6 +454,7 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 
 	@UiThread
 	private void showForumPostNotification(GroupId g) {
+		if (blockForums) return;
 		if (g.equals(blockedGroup)) return;
 		forumCounts.add(g);
 		updateForumPostNotification(true);
@@ -681,6 +684,26 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 		});
 	}
 
+	@Override
+	public void blockAllForumPostNotifications() {
+		androidExecutor.runOnUiThread((Runnable) () -> blockForums = true);
+	}
+
+	@Override
+	public void unblockAllForumPostNotifications() {
+		androidExecutor.runOnUiThread((Runnable) () -> blockForums = false);
+	}
+
+	@Override
+	public void blockAllGroupMessageNotifications() {
+		androidExecutor.runOnUiThread((Runnable) () -> blockGroups = true);
+	}
+
+	@Override
+	public void unblockAllGroupMessageNotifications() {
+		androidExecutor.runOnUiThread((Runnable) () -> blockGroups = false);
+	}
+
 	@Override
 	public void blockAllBlogPostNotifications() {
 		androidExecutor.runOnUiThread((Runnable) () -> blockBlogs = true);

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

@@ -28,9 +28,12 @@ import org.briarproject.bramble.plugin.tor.AndroidTorPluginFactory;
 import org.briarproject.bramble.util.AndroidUtils;
 import org.briarproject.bramble.util.StringUtils;
 import org.briarproject.briar.android.account.LockManagerImpl;
+import org.briarproject.briar.android.forum.ForumModule;
 import org.briarproject.briar.android.keyagreement.ContactExchangeModule;
 import org.briarproject.briar.android.login.LoginModule;
 import org.briarproject.briar.android.navdrawer.NavDrawerModule;
+import org.briarproject.briar.android.privategroup.list.GroupListModule;
+import org.briarproject.briar.android.reporting.DevReportModule;
 import org.briarproject.briar.android.viewmodel.ViewModelModule;
 import org.briarproject.briar.api.android.AndroidNotificationManager;
 import org.briarproject.briar.api.android.DozeWatchdog;
@@ -63,7 +66,11 @@ import static org.briarproject.briar.android.TestingConstants.IS_DEBUG_BUILD;
 		ContactExchangeModule.class,
 		LoginModule.class,
 		NavDrawerModule.class,
-		ViewModelModule.class
+		ViewModelModule.class,
+		DevReportModule.class,
+		// below need to be within same scope as ViewModelProvider.Factory
+		ForumModule.BindsModule.class,
+		GroupListModule.class,
 })
 public class AppModule {
 
@@ -196,7 +203,10 @@ public class AppModule {
 	ScreenFilterMonitor provideScreenFilterMonitor(
 			LifecycleManager lifecycleManager,
 			ScreenFilterMonitorImpl screenFilterMonitor) {
-		lifecycleManager.registerService(screenFilterMonitor);
+		if (SDK_INT <= 29) {
+			// this keeps track of installed apps and does not work on API 30+
+			lifecycleManager.registerService(screenFilterMonitor);
+		}
 		return screenFilterMonitor;
 	}
 

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

@@ -14,19 +14,13 @@ import android.preference.PreferenceManager;
 import com.vanniktech.emoji.EmojiManager;
 import com.vanniktech.emoji.google.GoogleEmojiProvider;
 
-import org.acra.ACRA;
-import org.acra.ReportingInteractionMode;
-import org.acra.annotation.ReportsCrashes;
 import org.briarproject.bramble.BrambleAndroidEagerSingletons;
 import org.briarproject.bramble.BrambleAppComponent;
 import org.briarproject.bramble.BrambleCoreEagerSingletons;
 import org.briarproject.briar.BriarCoreEagerSingletons;
-import org.briarproject.briar.BuildConfig;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.logging.CachingLogHandler;
-import org.briarproject.briar.android.reporting.BriarReportPrimer;
-import org.briarproject.briar.android.reporting.BriarReportSenderFactory;
-import org.briarproject.briar.android.reporting.DevReportActivity;
+import org.briarproject.briar.android.reporting.BriarExceptionHandler;
 import org.briarproject.briar.android.util.UiUtils;
 
 import java.util.Collection;
@@ -34,50 +28,14 @@ import java.util.logging.Handler;
 import java.util.logging.LogRecord;
 import java.util.logging.Logger;
 
+import androidx.annotation.NonNull;
+
 import static android.app.ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND;
 import static java.util.logging.Level.FINE;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Logger.getLogger;
-import static org.acra.ReportField.ANDROID_VERSION;
-import static org.acra.ReportField.APP_VERSION_CODE;
-import static org.acra.ReportField.APP_VERSION_NAME;
-import static org.acra.ReportField.BRAND;
-import static org.acra.ReportField.BUILD_CONFIG;
-import static org.acra.ReportField.CRASH_CONFIGURATION;
-import static org.acra.ReportField.CUSTOM_DATA;
-import static org.acra.ReportField.DEVICE_FEATURES;
-import static org.acra.ReportField.DISPLAY;
-import static org.acra.ReportField.INITIAL_CONFIGURATION;
-import static org.acra.ReportField.PACKAGE_NAME;
-import static org.acra.ReportField.PHONE_MODEL;
-import static org.acra.ReportField.PRODUCT;
-import static org.acra.ReportField.REPORT_ID;
-import static org.acra.ReportField.STACK_TRACE;
-import static org.acra.ReportField.USER_APP_START_DATE;
-import static org.acra.ReportField.USER_CRASH_DATE;
 import static org.briarproject.briar.android.TestingConstants.IS_DEBUG_BUILD;
 
-@ReportsCrashes(
-		reportPrimerClass = BriarReportPrimer.class,
-		logcatArguments = {"-d", "-v", "time", "*:I"},
-		reportSenderFactoryClasses = {BriarReportSenderFactory.class},
-		mode = ReportingInteractionMode.DIALOG,
-		reportDialogClass = DevReportActivity.class,
-		resDialogOkToast = R.string.dev_report_saved,
-		deleteOldUnsentReportsOnApplicationStart = false,
-		buildConfigClass = BuildConfig.class,
-		customReportContent = {
-				REPORT_ID,
-				APP_VERSION_CODE, APP_VERSION_NAME, PACKAGE_NAME,
-				PHONE_MODEL, ANDROID_VERSION, BRAND, PRODUCT,
-				BUILD_CONFIG,
-				CUSTOM_DATA,
-				STACK_TRACE,
-				INITIAL_CONFIGURATION, CRASH_CONFIGURATION,
-				DISPLAY, DEVICE_FEATURES,
-				USER_APP_START_DATE, USER_CRASH_DATE
-		}
-)
 public class BriarApplicationImpl extends Application
 		implements BriarApplication {
 
@@ -85,12 +43,15 @@ public class BriarApplicationImpl extends Application
 			getLogger(BriarApplicationImpl.class.getName());
 
 	private final CachingLogHandler logHandler = new CachingLogHandler();
+	private final BriarExceptionHandler exceptionHandler =
+			new BriarExceptionHandler(this);
 
 	private AndroidComponent applicationComponent;
 	private volatile SharedPreferences prefs;
 
 	@Override
 	protected void attachBaseContext(Context base) {
+		Thread.setDefaultUncaughtExceptionHandler(exceptionHandler);
 		if (prefs == null)
 			prefs = PreferenceManager.getDefaultSharedPreferences(base);
 		// Loading the language needs to be done here.
@@ -98,7 +59,6 @@ public class BriarApplicationImpl extends Application
 		super.attachBaseContext(
 				Localizer.getInstance().setLocale(base));
 		setTheme(base, prefs);
-		ACRA.init(this);
 	}
 
 	@Override
@@ -144,7 +104,7 @@ public class BriarApplicationImpl extends Application
 	}
 
 	@Override
-	public void onConfigurationChanged(Configuration newConfig) {
+	public void onConfigurationChanged(@NonNull Configuration newConfig) {
 		super.onConfigurationChanged(newConfig);
 		Localizer.getInstance().setLocale(this);
 	}

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

@@ -58,7 +58,7 @@ class ScreenFilterMonitorImpl implements ScreenFilterMonitor, Service {
 			Logger.getLogger(ScreenFilterMonitorImpl.class.getName());
 
 	/*
- 	 * Ignore Play Services if it uses this package name and public key - it's
+	 * Ignore Play Services if it uses this package name and public key - it's
 	 * effectively a system app, but not flagged as such on older systems
 	 */
 	private static final String PLAY_SERVICES_PACKAGE =
@@ -108,7 +108,7 @@ class ScreenFilterMonitorImpl implements ScreenFilterMonitor, Service {
 		Set<String> allowed = prefs.getStringSet(PREF_KEY_ALLOWED,
 				Collections.emptySet());
 		List<AppDetails> apps = new ArrayList<>();
-		List<PackageInfo> packageInfos =
+		@SuppressLint("QueryPermissionsNeeded") List<PackageInfo> packageInfos =
 				pm.getInstalledPackages(GET_PERMISSIONS);
 		for (PackageInfo packageInfo : packageInfos) {
 			if (!allowed.contains(packageInfo.packageName)

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

@@ -60,12 +60,14 @@ import org.briarproject.briar.android.privategroup.creation.GroupInviteFragment;
 import org.briarproject.briar.android.privategroup.invitation.GroupInvitationActivity;
 import org.briarproject.briar.android.privategroup.invitation.GroupInvitationModule;
 import org.briarproject.briar.android.privategroup.list.GroupListFragment;
-import org.briarproject.briar.android.privategroup.list.GroupListModule;
 import org.briarproject.briar.android.privategroup.memberlist.GroupMemberListActivity;
 import org.briarproject.briar.android.privategroup.memberlist.GroupMemberModule;
 import org.briarproject.briar.android.privategroup.reveal.GroupRevealModule;
 import org.briarproject.briar.android.privategroup.reveal.RevealContactsActivity;
 import org.briarproject.briar.android.privategroup.reveal.RevealContactsFragment;
+import org.briarproject.briar.android.reporting.CrashFragment;
+import org.briarproject.briar.android.reporting.CrashReportActivity;
+import org.briarproject.briar.android.reporting.ReportFormFragment;
 import org.briarproject.briar.android.settings.SettingsActivity;
 import org.briarproject.briar.android.settings.SettingsFragment;
 import org.briarproject.briar.android.sharing.BlogInvitationActivity;
@@ -91,7 +93,6 @@ import dagger.Component;
 		ForumModule.class,
 		GroupInvitationModule.class,
 		GroupConversationModule.class,
-		GroupListModule.class,
 		GroupMemberModule.class,
 		GroupRevealModule.class,
 		SharingModule.class
@@ -184,6 +185,8 @@ public interface ActivityComponent {
 
 	void inject(PendingContactListActivity activity);
 
+	void inject(CrashReportActivity crashReportActivity);
+
 	// Fragments
 
 	void inject(AuthorNameFragment fragment);
@@ -234,4 +237,8 @@ public interface ActivityComponent {
 
 	void inject(ImageFragment imageFragment);
 
+	void inject(ReportFormFragment reportFormFragment);
+
+	void inject(CrashFragment crashFragment);
+
 }

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

@@ -6,7 +6,6 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.view.ViewGroup.LayoutParams;
 
-import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
@@ -18,7 +17,6 @@ import org.briarproject.briar.android.controller.ActivityLifecycleController;
 import org.briarproject.briar.android.forum.ForumModule;
 import org.briarproject.briar.android.fragment.BaseFragment;
 import org.briarproject.briar.android.fragment.ScreenFilterDialogFragment;
-import org.briarproject.briar.android.reporting.DevReportActivity;
 import org.briarproject.briar.android.util.UiUtils;
 import org.briarproject.briar.android.widget.TapSafeFrameLayout;
 import org.briarproject.briar.android.widget.TapSafeFrameLayout.OnTapFilteredListener;
@@ -40,9 +38,11 @@ import androidx.appcompat.widget.Toolbar;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentManager;
 
+import static android.os.Build.VERSION.SDK_INT;
 import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
 import static android.view.WindowManager.LayoutParams.FLAG_SECURE;
 import static androidx.lifecycle.Lifecycle.State.STARTED;
+import static java.util.Collections.emptyList;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Logger.getLogger;
 import static org.briarproject.briar.android.TestingConstants.PREVENT_SCREENSHOTS;
@@ -50,7 +50,6 @@ import static org.briarproject.briar.android.util.UiUtils.hideSoftKeyboard;
 
 /**
  * Warning: Some activities don't extend {@link BaseActivity}.
- *          E.g. {@link DevReportActivity}
  */
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -123,6 +122,7 @@ public abstract class BaseActivity extends AppCompatActivity
 		return new ActivityModule(this);
 	}
 
+	// TODO use a test module where this is used in tests
 	protected ForumModule getForumModule() {
 		return new ForumModule();
 	}
@@ -202,9 +202,15 @@ public abstract class BaseActivity extends AppCompatActivity
 		// If the dialog is already visible, filter the tap
 		ScreenFilterDialogFragment f = findDialogFragment();
 		if (f != null && f.isVisible()) return false;
-		Collection<AppDetails> apps = screenFilterMonitor.getApps();
-		// If all overlay apps have been allowed, allow the tap
-		if (apps.isEmpty()) return true;
+		Collection<AppDetails> apps;
+		// querying all apps is only possible at API 29 and below
+		if (SDK_INT <= 29) {
+			apps = screenFilterMonitor.getApps();
+			// If all overlay apps have been allowed, allow the tap
+			if (apps.isEmpty()) return true;
+		} else {
+			apps = emptyList();
+		}
 		// Show dialog unless onSaveInstanceState() has been called, see #1112
 		FragmentManager fm = getSupportFragmentManager();
 		if (!fm.isStateSaved()) {
@@ -241,7 +247,7 @@ public abstract class BaseActivity extends AppCompatActivity
 	}
 
 	@UiThread
-	public void handleDbException(DbException e) {
+	public void handleException(Exception e) {
 		supportFinishAfterTransition();
 	}
 
@@ -266,7 +272,12 @@ public abstract class BaseActivity extends AppCompatActivity
 	private void protectToolbar() {
 		findToolbar();
 		if (toolbar != null) {
-			boolean filter = !screenFilterMonitor.getApps().isEmpty();
+			boolean filter;
+			if (SDK_INT <= 29) {
+				filter = !screenFilterMonitor.getApps().isEmpty();
+			} else {
+				filter = true;
+			}
 			UiUtils.setFilterTouchesWhenObscured(toolbar, filter);
 		}
 	}

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

@@ -129,10 +129,6 @@ public abstract class BriarActivity extends BaseActivity {
 		lockManager.onActivityStop();
 	}
 
-	protected boolean signedIn() {
-		return briarController.accountSignedIn();
-	}
-
 	/**
 	 * Sets the transition animations.
 	 *

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) {
@@ -232,7 +232,7 @@ public class BlogFragment extends BaseFragment
 
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				}
 		);
@@ -277,7 +277,7 @@ public class BlogFragment extends BaseFragment
 
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 	}
@@ -296,7 +296,7 @@ public class BlogFragment extends BaseFragment
 
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 	}
@@ -318,7 +318,7 @@ public class BlogFragment extends BaseFragment
 
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 	}
@@ -398,7 +398,7 @@ public class BlogFragment extends BaseFragment
 
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 	}

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

@@ -58,7 +58,7 @@ public class BlogPostFragment extends BasePostFragment implements BlogListener {
 
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 	}

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
@@ -156,7 +156,7 @@ public class FeedFragment extends BaseFragment implements
 
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 	}
@@ -187,7 +187,7 @@ public class FeedFragment extends BaseFragment implements
 
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 	}
@@ -242,7 +242,7 @@ public class FeedFragment extends BaseFragment implements
 
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				}
 		);

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);
@@ -80,7 +79,7 @@ public class FeedPostFragment extends BasePostFragment {
 
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 	}

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 =
@@ -101,7 +101,7 @@ public class ReblogFragment extends BaseFragment implements SendListener {
 
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 
@@ -128,7 +128,7 @@ public class ReblogFragment extends BaseFragment implements SendListener {
 				new UiExceptionHandler<DbException>(this) {
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 		finish();

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/AddContactViewModel.java

@@ -9,7 +9,11 @@ import org.briarproject.bramble.api.contact.PendingContact;
 import org.briarproject.bramble.api.db.DatabaseExecutor;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.NoSuchPendingContactException;
+import org.briarproject.bramble.api.db.TransactionManager;
+import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.system.AndroidExecutor;
+import org.briarproject.briar.android.viewmodel.DbViewModel;
 import org.briarproject.briar.android.viewmodel.LiveEvent;
 import org.briarproject.briar.android.viewmodel.LiveResult;
 import org.briarproject.briar.android.viewmodel.MutableLiveEvent;
@@ -21,7 +25,6 @@ import java.util.logging.Logger;
 import javax.inject.Inject;
 
 import androidx.annotation.Nullable;
-import androidx.lifecycle.AndroidViewModel;
 import androidx.lifecycle.LiveData;
 import androidx.lifecycle.MutableLiveData;
 
@@ -31,14 +34,12 @@ import static org.briarproject.bramble.api.contact.HandshakeLinkConstants.LINK_R
 import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
-public class AddContactViewModel extends AndroidViewModel {
+public class AddContactViewModel extends DbViewModel {
 
 	private final static Logger LOG =
 			getLogger(AddContactViewModel.class.getName());
 
 	private final ContactManager contactManager;
-	@DatabaseExecutor
-	private final Executor dbExecutor;
 
 	private final MutableLiveData<String> handshakeLink =
 			new MutableLiveData<>();
@@ -52,10 +53,12 @@ public class AddContactViewModel extends AndroidViewModel {
 	@Inject
 	AddContactViewModel(Application application,
 			ContactManager contactManager,
-			@DatabaseExecutor Executor dbExecutor) {
-		super(application);
+			@DatabaseExecutor Executor dbExecutor,
+			LifecycleManager lifecycleManager,
+			TransactionManager db,
+			AndroidExecutor androidExecutor) {
+		super(application, dbExecutor, lifecycleManager, db, androidExecutor);
 		this.contactManager = contactManager;
-		this.dbExecutor = dbExecutor;
 	}
 
 	void onCreate() {
@@ -63,7 +66,7 @@ public class AddContactViewModel extends AndroidViewModel {
 	}
 
 	private void loadHandshakeLink() {
-		dbExecutor.execute(() -> {
+		runOnDbThread(() -> {
 			try {
 				handshakeLink.postValue(contactManager.getHandshakeLink());
 			} catch (DbException e) {
@@ -102,7 +105,7 @@ public class AddContactViewModel extends AndroidViewModel {
 
 	void addContact(String nickname) {
 		if (remoteHandshakeLink == null) throw new IllegalStateException();
-		dbExecutor.execute(() -> {
+		runOnDbThread(() -> {
 			try {
 				contactManager.addPendingContact(remoteHandshakeLink, nickname);
 				addContactResult.postValue(new LiveResult<>(true));
@@ -122,11 +125,11 @@ public class AddContactViewModel extends AndroidViewModel {
 	}
 
 	public void updatePendingContact(String name, PendingContact p) {
-		dbExecutor.execute(() -> {
+		runOnDbThread(() -> {
 			try {
 				contactManager.removePendingContact(p.getId());
 				addContact(name);
-			} catch(NoSuchPendingContactException e) {
+			} catch (NoSuchPendingContactException e) {
 				logException(LOG, WARNING, e);
 				// no error in UI as pending contact was converted into contact
 			} catch (DbException e) {

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/contact/add/remote/PendingContactListViewModel.java

@@ -11,12 +11,16 @@ import org.briarproject.bramble.api.contact.event.PendingContactRemovedEvent;
 import org.briarproject.bramble.api.contact.event.PendingContactStateChangedEvent;
 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.event.Event;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.event.EventListener;
+import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.rendezvous.RendezvousPoller;
 import org.briarproject.bramble.api.rendezvous.event.RendezvousPollEvent;
+import org.briarproject.bramble.api.system.AndroidExecutor;
+import org.briarproject.briar.android.viewmodel.DbViewModel;
 
 import java.util.ArrayList;
 import java.util.Collection;
@@ -26,7 +30,6 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
-import androidx.lifecycle.AndroidViewModel;
 import androidx.lifecycle.LiveData;
 import androidx.lifecycle.MutableLiveData;
 
@@ -36,14 +39,12 @@ import static org.briarproject.bramble.api.contact.PendingContactState.OFFLINE;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
-public class PendingContactListViewModel extends AndroidViewModel
+public class PendingContactListViewModel extends DbViewModel
 		implements EventListener {
 
 	private final Logger LOG =
 			getLogger(PendingContactListViewModel.class.getName());
 
-	@DatabaseExecutor
-	private final Executor dbExecutor;
 	private final ContactManager contactManager;
 	private final RendezvousPoller rendezvousPoller;
 	private final EventBus eventBus;
@@ -56,11 +57,13 @@ public class PendingContactListViewModel extends AndroidViewModel
 	@Inject
 	PendingContactListViewModel(Application application,
 			@DatabaseExecutor Executor dbExecutor,
+			LifecycleManager lifecycleManager,
+			TransactionManager db,
+			AndroidExecutor androidExecutor,
 			ContactManager contactManager,
 			RendezvousPoller rendezvousPoller,
 			EventBus eventBus) {
-		super(application);
-		this.dbExecutor = dbExecutor;
+		super(application, dbExecutor, lifecycleManager, db, androidExecutor);
 		this.contactManager = contactManager;
 		this.rendezvousPoller = rendezvousPoller;
 		this.eventBus = eventBus;
@@ -87,7 +90,7 @@ public class PendingContactListViewModel extends AndroidViewModel
 	}
 
 	private void loadPendingContacts() {
-		dbExecutor.execute(() -> {
+		runOnDbThread(() -> {
 			try {
 				Collection<Pair<PendingContact, PendingContactState>> pairs =
 						contactManager.getPendingContacts();
@@ -113,7 +116,7 @@ public class PendingContactListViewModel extends AndroidViewModel
 	}
 
 	void removePendingContact(PendingContactId id) {
-		dbExecutor.execute(() -> {
+		runOnDbThread(() -> {
 			try {
 				contactManager.removePendingContact(id);
 			} catch (DbException e) {

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
@@ -134,7 +133,7 @@ public abstract class BaseContactSelectorFragment<I extends SelectableContactIte
 
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 	}

briar-android/src/main/java/org/briarproject/briar/android/controller/DbController.java

@@ -2,6 +2,7 @@ package org.briarproject.briar.android.controller;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 
+@Deprecated
 @NotNullByDefault
 public interface DbController {
 

briar-android/src/main/java/org/briarproject/briar/android/controller/DbControllerImpl.java

@@ -11,6 +11,7 @@ import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 
 @Immutable
+@Deprecated
 @NotNullByDefault
 public class DbControllerImpl implements DbController {
 

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

@@ -98,7 +98,6 @@ import androidx.core.content.ContextCompat;
 import androidx.lifecycle.LiveData;
 import androidx.lifecycle.Observer;
 import androidx.lifecycle.ViewModelProvider;
-import androidx.lifecycle.ViewModelProviders;
 import androidx.recyclerview.selection.Selection;
 import androidx.recyclerview.selection.SelectionPredicates;
 import androidx.recyclerview.selection.SelectionTracker;
@@ -224,8 +223,9 @@ public class ConversationActivity extends BriarActivity
 		if (id == -1) throw new IllegalStateException();
 		contactId = new ContactId(id);
 
-		viewModel = ViewModelProviders.of(this, viewModelFactory)
+		viewModel = new ViewModelProvider(this, viewModelFactory)
 				.get(ConversationViewModel.class);
+		viewModel.setContactId(contactId);
 		attachmentRetriever = viewModel.getAttachmentRetriever();
 
 		setContentView(R.layout.activity_conversation);
@@ -330,16 +330,6 @@ public class ConversationActivity extends BriarActivity
 		list.startPeriodicUpdate();
 	}
 
-	@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 onStop() {
 		super.onStop();

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

@@ -15,17 +15,20 @@ import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.event.EventListener;
 import org.briarproject.bramble.api.identity.AuthorId;
+import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.settings.Settings;
 import org.briarproject.bramble.api.settings.SettingsManager;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.bramble.api.sync.Message;
 import org.briarproject.bramble.api.sync.MessageId;
+import org.briarproject.bramble.api.system.AndroidExecutor;
 import org.briarproject.briar.android.attachment.AttachmentCreator;
 import org.briarproject.briar.android.attachment.AttachmentManager;
 import org.briarproject.briar.android.attachment.AttachmentResult;
 import org.briarproject.briar.android.attachment.AttachmentRetriever;
 import org.briarproject.briar.android.util.UiUtils;
+import org.briarproject.briar.android.viewmodel.DbViewModel;
 import org.briarproject.briar.android.viewmodel.LiveEvent;
 import org.briarproject.briar.android.viewmodel.MutableLiveEvent;
 import org.briarproject.briar.api.messaging.AttachmentHeader;
@@ -44,7 +47,6 @@ import javax.inject.Inject;
 
 import androidx.annotation.Nullable;
 import androidx.annotation.UiThread;
-import androidx.lifecycle.AndroidViewModel;
 import androidx.lifecycle.LiveData;
 import androidx.lifecycle.MutableLiveData;
 import androidx.lifecycle.Transformations;
@@ -59,10 +61,10 @@ import static org.briarproject.briar.android.settings.SettingsFragment.SETTINGS_
 import static org.briarproject.briar.android.util.UiUtils.observeForeverOnce;
 
 @NotNullByDefault
-public class ConversationViewModel extends AndroidViewModel
+public class ConversationViewModel extends DbViewModel
 		implements EventListener, AttachmentManager {
 
-	private static Logger LOG =
+	private static final Logger LOG =
 			getLogger(ConversationViewModel.class.getName());
 
 	private static final String SHOW_ONBOARDING_IMAGE =
@@ -70,8 +72,6 @@ public class ConversationViewModel extends AndroidViewModel
 	private static final String SHOW_ONBOARDING_INTRODUCTION =
 			"showOnboardingIntroduction";
 
-	@DatabaseExecutor
-	private final Executor dbExecutor;
 	private final TransactionManager db;
 	private final EventBus eventBus;
 	private final MessagingManager messagingManager;
@@ -105,7 +105,9 @@ public class ConversationViewModel extends AndroidViewModel
 	@Inject
 	ConversationViewModel(Application application,
 			@DatabaseExecutor Executor dbExecutor,
+			LifecycleManager lifecycleManager,
 			TransactionManager db,
+			AndroidExecutor androidExecutor,
 			EventBus eventBus,
 			MessagingManager messagingManager,
 			ContactManager contactManager,
@@ -113,8 +115,7 @@ public class ConversationViewModel extends AndroidViewModel
 			PrivateMessageFactory privateMessageFactory,
 			AttachmentRetriever attachmentRetriever,
 			AttachmentCreator attachmentCreator) {
-		super(application);
-		this.dbExecutor = dbExecutor;
+		super(application, dbExecutor, lifecycleManager, db, androidExecutor);
 		this.db = db;
 		this.eventBus = eventBus;
 		this.messagingManager = messagingManager;
@@ -143,7 +144,7 @@ public class ConversationViewModel extends AndroidViewModel
 			AttachmentReceivedEvent a = (AttachmentReceivedEvent) e;
 			if (a.getContactId().equals(contactId)) {
 				LOG.info("Attachment received");
-				dbExecutor.execute(() -> attachmentRetriever
+				runOnDbThread(() -> attachmentRetriever
 						.loadAttachmentItem(a.getMessageId()));
 			}
 		}
@@ -163,7 +164,7 @@ public class ConversationViewModel extends AndroidViewModel
 	}
 
 	private void loadContact(ContactId contactId) {
-		dbExecutor.execute(() -> {
+		runOnDbThread(() -> {
 			try {
 				long start = now();
 				Contact c = contactManager.getContact(contactId);
@@ -181,7 +182,7 @@ public class ConversationViewModel extends AndroidViewModel
 	}
 
 	void markMessageRead(GroupId g, MessageId m) {
-		dbExecutor.execute(() -> {
+		runOnDbThread(() -> {
 			try {
 				long start = now();
 				messagingManager.setReadFlag(g, m, true);
@@ -193,7 +194,7 @@ public class ConversationViewModel extends AndroidViewModel
 	}
 
 	void setContactAlias(String alias) {
-		dbExecutor.execute(() -> {
+		runOnDbThread(() -> {
 			try {
 				contactManager.setContactAlias(requireNonNull(contactId),
 						alias.isEmpty() ? null : alias);
@@ -296,7 +297,7 @@ public class ConversationViewModel extends AndroidViewModel
 	@UiThread
 	private void storeMessage(PrivateMessage m) {
 		attachmentCreator.onAttachmentsSent(m.getMessage().getId());
-		dbExecutor.execute(() -> {
+		runOnDbThread(() -> {
 			try {
 				long start = now();
 				messagingManager.addLocalMessage(m);
@@ -356,7 +357,7 @@ public class ConversationViewModel extends AndroidViewModel
 
 	@UiThread
 	void recheckFeaturesAndOnboarding(ContactId contactId) {
-		dbExecutor.execute(() -> {
+		runOnDbThread(() -> {
 			try {
 				checkFeaturesAndOnboarding(contactId);
 			} catch (DbException e) {

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/conversation/ImageViewModel.java

@@ -7,13 +7,17 @@ import android.view.View;
 
 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.event.Event;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.event.EventListener;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
+import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.MessageId;
+import org.briarproject.bramble.api.system.AndroidExecutor;
 import org.briarproject.briar.android.attachment.AttachmentItem;
+import org.briarproject.briar.android.viewmodel.DbViewModel;
 import org.briarproject.briar.android.viewmodel.LiveEvent;
 import org.briarproject.briar.android.viewmodel.MutableLiveEvent;
 import org.briarproject.briar.api.messaging.Attachment;
@@ -37,7 +41,6 @@ import javax.inject.Inject;
 
 import androidx.annotation.Nullable;
 import androidx.annotation.UiThread;
-import androidx.lifecycle.AndroidViewModel;
 
 import static android.media.MediaScannerConnection.scanFile;
 import static android.os.Environment.DIRECTORY_PICTURES;
@@ -49,20 +52,18 @@ import static org.briarproject.bramble.util.IoUtils.copyAndClose;
 import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
-public class ImageViewModel extends AndroidViewModel implements EventListener {
+public class ImageViewModel extends DbViewModel implements EventListener {
 
-	private static Logger LOG = getLogger(ImageViewModel.class.getName());
+	private static final Logger LOG = getLogger(ImageViewModel.class.getName());
 
 	private final MessagingManager messagingManager;
 	private final EventBus eventBus;
-	@DatabaseExecutor
-	private final Executor dbExecutor;
 	@IoExecutor
 	private final Executor ioExecutor;
 
 	private boolean receivedAttachmentsInitialized = false;
-	private HashMap<MessageId, MutableLiveEvent<Boolean>> receivedAttachments =
-			new HashMap<>();
+	private final HashMap<MessageId, MutableLiveEvent<Boolean>>
+			receivedAttachments = new HashMap<>();
 
 	/**
 	 * true means there was an error saving the image, false if image was saved.
@@ -75,13 +76,16 @@ public class ImageViewModel extends AndroidViewModel implements EventListener {
 
 	@Inject
 	ImageViewModel(Application application,
-			MessagingManager messagingManager, EventBus eventBus,
+			MessagingManager messagingManager,
+			EventBus eventBus,
 			@DatabaseExecutor Executor dbExecutor,
+			LifecycleManager lifecycleManager,
+			TransactionManager db,
+			AndroidExecutor androidExecutor,
 			@IoExecutor Executor ioExecutor) {
-		super(application);
+		super(application, dbExecutor, lifecycleManager, db, androidExecutor);
 		this.messagingManager = messagingManager;
 		this.eventBus = eventBus;
-		this.dbExecutor = dbExecutor;
 		this.ioExecutor = ioExecutor;
 
 		eventBus.addListener(this);
@@ -195,7 +199,7 @@ public class ImageViewModel extends AndroidViewModel implements EventListener {
 
 	private void saveImage(AttachmentItem attachment, OutputStreamProvider osp,
 			@Nullable Runnable afterCopy) {
-		dbExecutor.execute(() -> {
+		runOnDbThread(() -> {
 			try {
 				Attachment a =
 						messagingManager.getAttachment(attachment.getHeader());

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

@@ -38,7 +38,7 @@ import static org.briarproject.briar.api.forum.ForumConstants.MAX_FORUM_POST_TEX
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 public class ForumActivity extends
-		ThreadListActivity<Forum, ForumItem, ThreadItemAdapter<ForumItem>>
+		ThreadListActivity<Forum, ForumPostItem, ThreadItemAdapter<ForumPostItem>>
 		implements ForumListener {
 
 	@Inject
@@ -50,7 +50,7 @@ public class ForumActivity extends
 	}
 
 	@Override
-	protected ThreadListController<Forum, ForumItem> getController() {
+	protected ThreadListController<Forum, ForumPostItem> getController() {
 		return forumController;
 	}
 
@@ -82,7 +82,7 @@ public class ForumActivity extends
 	}
 
 	@Override
-	protected ThreadItemAdapter<ForumItem> createAdapter(
+	protected ThreadItemAdapter<ForumPostItem> createAdapter(
 			LinearLayoutManager layoutManager) {
 		return new ThreadItemAdapter<>(this, layoutManager);
 	}
@@ -156,7 +156,7 @@ public class ForumActivity extends
 
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 	}

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

@@ -8,9 +8,9 @@ import org.briarproject.briar.api.forum.Forum;
 import androidx.annotation.UiThread;
 
 @NotNullByDefault
-interface ForumController extends ThreadListController<Forum, ForumItem> {
+interface ForumController extends ThreadListController<Forum, ForumPostItem> {
 
-	interface ForumListener extends ThreadListListener<ForumItem> {
+	interface ForumListener extends ThreadListListener<ForumPostItem> {
 		@UiThread
 		void onForumLeft(ContactId c);
 	}

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

@@ -43,7 +43,7 @@ import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
 class ForumControllerImpl extends
-		ThreadListControllerImpl<Forum, ForumItem, ForumPostHeader, ForumPost, ForumListener>
+		ThreadListControllerImpl<Forum, ForumPostItem, ForumPostHeader, ForumPost, ForumListener>
 		implements ForumController {
 
 	private static final Logger LOG =
@@ -138,8 +138,8 @@ class ForumControllerImpl extends
 
 	@Override
 	public void createAndStoreMessage(String text,
-			@Nullable ForumItem parentItem,
-			ResultExceptionHandler<ForumItem, DbException> handler) {
+			@Nullable ForumPostItem parentItem,
+			ResultExceptionHandler<ForumPostItem, DbException> handler) {
 		runOnDbThread(() -> {
 			try {
 				LocalAuthor author = identityManager.getLocalAuthor();
@@ -158,7 +158,7 @@ class ForumControllerImpl extends
 
 	private void createMessage(String text, long timestamp,
 			@Nullable MessageId parentId, LocalAuthor author,
-			ResultExceptionHandler<ForumItem, DbException> handler) {
+			ResultExceptionHandler<ForumPostItem, DbException> handler) {
 		cryptoExecutor.execute(() -> {
 			LOG.info("Creating forum post...");
 			ForumPost msg = forumManager.createLocalPost(getGroupId(), text,
@@ -178,8 +178,8 @@ class ForumControllerImpl extends
 	}
 
 	@Override
-	protected ForumItem buildItem(ForumPostHeader header, String text) {
-		return new ForumItem(header, text);
+	protected ForumPostItem buildItem(ForumPostHeader header, String text) {
+		return new ForumPostItem(header, text);
 	}
 
 }

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

@@ -1,134 +1,47 @@
 package org.briarproject.briar.android.forum;
 
-import android.content.Context;
-import android.content.Intent;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.TextView;
 
-import org.briarproject.bramble.api.sync.GroupId;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
-import org.briarproject.briar.android.util.BriarAdapter;
-import org.briarproject.briar.android.util.UiUtils;
-import org.briarproject.briar.android.view.TextAvatarView;
-import org.briarproject.briar.api.forum.Forum;
 
-import androidx.recyclerview.widget.RecyclerView;
+import androidx.recyclerview.widget.DiffUtil.ItemCallback;
+import androidx.recyclerview.widget.ListAdapter;
 
-import static android.view.View.GONE;
-import static android.view.View.VISIBLE;
-import static androidx.recyclerview.widget.SortedList.INVALID_POSITION;
-import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
-import static org.briarproject.briar.android.activity.BriarActivity.GROUP_NAME;
+@NotNullByDefault
+class ForumListAdapter extends ListAdapter<ForumListItem, ForumViewHolder> {
 
-class ForumListAdapter
-		extends BriarAdapter<ForumListItem, ForumListAdapter.ForumViewHolder> {
-
-	ForumListAdapter(Context ctx) {
-		super(ctx, ForumListItem.class);
+	ForumListAdapter() {
+		super(new ForumListCallback());
 	}
 
 	@Override
 	public ForumViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
-		View v = LayoutInflater.from(ctx).inflate(
+		View v = LayoutInflater.from(parent.getContext()).inflate(
 				R.layout.list_item_forum, parent, false);
 		return new ForumViewHolder(v);
 	}
 
 	@Override
-	public void onBindViewHolder(ForumViewHolder ui, int position) {
-		ForumListItem item = getItemAt(position);
-		if (item == null) return;
+	public void onBindViewHolder(ForumViewHolder viewHolder, int position) {
+		viewHolder.bind(getItem(position));
+	}
 
-		// Avatar
-		ui.avatar.setText(item.getForum().getName().substring(0, 1));
-		ui.avatar.setBackgroundBytes(item.getForum().getId().getBytes());
-		ui.avatar.setUnreadCount(item.getUnreadCount());
-
-		// Forum Name
-		ui.name.setText(item.getForum().getName());
-
-		// Post Count
-		int postCount = item.getPostCount();
-		if (postCount > 0) {
-			ui.postCount.setText(ctx.getResources()
-					.getQuantityString(R.plurals.posts, postCount,
-							postCount));
-		} else {
-			ui.postCount.setText(ctx.getString(R.string.no_posts));
+	@NotNullByDefault
+	private static class ForumListCallback extends ItemCallback<ForumListItem> {
+		@Override
+		public boolean areItemsTheSame(ForumListItem a, ForumListItem b) {
+			return a.equals(b);
 		}
 
-		// Date
-		if (item.isEmpty()) {
-			ui.date.setVisibility(GONE);
-		} else {
-			long timestamp = item.getTimestamp();
-			ui.date.setText(UiUtils.formatDate(ctx, timestamp));
-			ui.date.setVisibility(VISIBLE);
-		}
-
-		// Open Forum on Click
-		ui.layout.setOnClickListener(v -> {
-			Intent i = new Intent(ctx, ForumActivity.class);
-			Forum f = item.getForum();
-			i.putExtra(GROUP_ID, f.getId().getBytes());
-			i.putExtra(GROUP_NAME, f.getName());
-			ctx.startActivity(i);
-		});
-	}
-
-	@Override
-	public int compare(ForumListItem a, ForumListItem b) {
-		if (a == b) return 0;
-		// The forum with the newest message comes first
-		long aTime = a.getTimestamp(), bTime = b.getTimestamp();
-		if (aTime > bTime) return -1;
-		if (aTime < bTime) return 1;
-		// Break ties by forum name
-		String aName = a.getForum().getName();
-		String bName = b.getForum().getName();
-		return String.CASE_INSENSITIVE_ORDER.compare(aName, bName);
-	}
-
-	@Override
-	public boolean areContentsTheSame(ForumListItem a, ForumListItem b) {
-		return a.isEmpty() == b.isEmpty() &&
-				a.getTimestamp() == b.getTimestamp() &&
-				a.getUnreadCount() == b.getUnreadCount();
-	}
-
-	@Override
-	public boolean areItemsTheSame(ForumListItem a, ForumListItem b) {
-		return a.getForum().equals(b.getForum());
-	}
-
-	int findItemPosition(GroupId g) {
-		int count = getItemCount();
-		for (int i = 0; i < count; i++) {
-			ForumListItem item = getItemAt(i);
-			if (item != null && item.getForum().getGroup().getId().equals(g))
-				return i;
-		}
-		return INVALID_POSITION; // Not found
-	}
-
-	static class ForumViewHolder extends RecyclerView.ViewHolder {
-
-		private final ViewGroup layout;
-		private final TextAvatarView avatar;
-		private final TextView name;
-		private final TextView postCount;
-		private final TextView date;
-
-		private ForumViewHolder(View v) {
-			super(v);
-
-			layout = (ViewGroup) v;
-			avatar = v.findViewById(R.id.avatarView);
-			name = v.findViewById(R.id.forumNameView);
-			postCount = v.findViewById(R.id.postCountView);
-			date = v.findViewById(R.id.dateView);
+		@Override
+		public boolean areContentsTheSame(ForumListItem a, ForumListItem b) {
+			return a.isEmpty() == b.isEmpty() &&
+					a.getTimestamp() == b.getTimestamp() &&
+					a.getUnreadCount() == b.getUnreadCount();
 		}
 	}
+
 }

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

@@ -12,81 +12,48 @@ import android.view.ViewGroup;
 
 import com.google.android.material.snackbar.Snackbar;
 
-import org.briarproject.bramble.api.contact.event.ContactRemovedEvent;
-import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.db.NoSuchGroupException;
-import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
-import org.briarproject.bramble.api.sync.GroupId;
-import org.briarproject.bramble.api.sync.event.GroupAddedEvent;
-import org.briarproject.bramble.api.sync.event.GroupRemovedEvent;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
-import org.briarproject.briar.android.fragment.BaseEventFragment;
+import org.briarproject.briar.android.fragment.BaseFragment;
 import org.briarproject.briar.android.sharing.ForumInvitationActivity;
 import org.briarproject.briar.android.util.BriarSnackbarBuilder;
 import org.briarproject.briar.android.view.BriarRecyclerView;
-import org.briarproject.briar.api.android.AndroidNotificationManager;
-import org.briarproject.briar.api.client.MessageTracker.GroupCount;
-import org.briarproject.briar.api.forum.Forum;
-import org.briarproject.briar.api.forum.ForumManager;
-import org.briarproject.briar.api.forum.ForumPostHeader;
-import org.briarproject.briar.api.forum.ForumSharingManager;
-import org.briarproject.briar.api.forum.event.ForumInvitationRequestReceivedEvent;
-import org.briarproject.briar.api.forum.event.ForumPostReceivedEvent;
-
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
-import androidx.annotation.UiThread;
+import androidx.lifecycle.ViewModelProvider;
 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;
-import static org.briarproject.bramble.util.LogUtils.now;
-import static org.briarproject.briar.api.forum.ForumManager.CLIENT_ID;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
-public class ForumListFragment extends BaseEventFragment implements
+public class ForumListFragment extends BaseFragment implements
 		OnClickListener {
 
 	public final static String TAG = ForumListFragment.class.getName();
-	private final static Logger LOG = Logger.getLogger(TAG);
 
+	private ForumListViewModel viewModel;
 	private BriarRecyclerView list;
-	private ForumListAdapter adapter;
 	private Snackbar snackbar;
+	private final ForumListAdapter adapter = new ForumListAdapter();
 
 	@Inject
-	AndroidNotificationManager notificationManager;
-
-	// Fields that are accessed from background threads must be volatile
-	@Inject
-	volatile ForumManager forumManager;
-	@Inject
-	volatile ForumSharingManager forumSharingManager;
+	ViewModelProvider.Factory viewModelFactory;
 
 	public static ForumListFragment newInstance() {
-
-		Bundle args = new Bundle();
-
-		ForumListFragment fragment = new ForumListFragment();
-		fragment.setArguments(args);
-		return fragment;
+		return new ForumListFragment();
 	}
 
 	@Override
 	public void injectFragment(ActivityComponent component) {
 		component.inject(this);
+		viewModel = new ViewModelProvider(this, viewModelFactory)
+				.get(ForumListViewModel.class);
 	}
 
 	@Nullable
@@ -94,24 +61,35 @@ public class ForumListFragment extends BaseEventFragment implements
 	public View onCreateView(LayoutInflater inflater,
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
+		requireActivity().setTitle(R.string.forums_button);
 
-		requireNonNull(getActivity()).setTitle(R.string.forums_button);
+		View v = inflater.inflate(R.layout.fragment_forum_list, container,
+				false);
 
-		View contentView =
-				inflater.inflate(R.layout.fragment_forum_list, container,
-						false);
-
-		adapter = new ForumListAdapter(getActivity());
-
-		list = contentView.findViewById(R.id.forumList);
+		list = v.findViewById(R.id.forumList);
 		list.setLayoutManager(new LinearLayoutManager(getActivity()));
 		list.setAdapter(adapter);
+		viewModel.getForumListItems().observe(getViewLifecycleOwner(), result ->
+				result.onError(this::handleException).onSuccess(items -> {
+					adapter.submitList(items);
+					if (requireNonNull(items).size() == 0) list.showData();
+				})
+		);
 
 		snackbar = new BriarSnackbarBuilder()
 				.setAction(R.string.show, this)
 				.make(list, "", LENGTH_INDEFINITE);
+		viewModel.getNumInvitations().observe(getViewLifecycleOwner(), num -> {
+			if (num == 0) {
+				snackbar.dismiss();
+			} else {
+				snackbar.setText(getResources().getQuantityString(
+						R.plurals.forums_shared, num, num));
+				if (!snackbar.isShownOrQueued()) snackbar.show();
+			}
+		});
 
-		return contentView;
+		return v;
 	}
 
 	@Override
@@ -122,18 +100,23 @@ public class ForumListFragment extends BaseEventFragment implements
 	@Override
 	public void onStart() {
 		super.onStart();
-		notificationManager.clearAllForumPostNotifications();
-		loadForums();
-		loadAvailableForums();
+		viewModel.blockAllForumPostNotifications();
+		viewModel.clearAllForumPostNotifications();
+		// The attributes and sorting of the forums may have changed while we
+		// were stopped and we have no way finding out about them, so re-load
+		// e.g. less unread posts in a forum after viewing it.
+		viewModel.loadForums();
+		// The number of invitations might have changed while we were stopped
+		// e.g. because of accepting an invitation which does not trigger event
+		viewModel.loadForumInvitations();
 		list.startPeriodicUpdate();
 	}
 
 	@Override
 	public void onStop() {
 		super.onStop();
-		adapter.clear();
-		list.showProgressBar();
 		list.stopPeriodicUpdate();
+		viewModel.unblockAllForumPostNotifications();
 	}
 
 	@Override
@@ -145,123 +128,12 @@ public class ForumListFragment extends BaseEventFragment implements
 	@Override
 	public boolean onOptionsItemSelected(MenuItem item) {
 		// Handle presses on the action bar items
-		switch (item.getItemId()) {
-			case R.id.action_create_forum:
-				Intent intent =
-						new Intent(getContext(), CreateForumActivity.class);
-				startActivity(intent);
-				return true;
-			default:
-				return super.onOptionsItemSelected(item);
+		if (item.getItemId() == R.id.action_create_forum) {
+			Intent intent = new Intent(getContext(), CreateForumActivity.class);
+			startActivity(intent);
+			return true;
 		}
-	}
-
-	private void loadForums() {
-		int revision = adapter.getRevision();
-		listener.runOnDbThread(() -> {
-			try {
-				long start = now();
-				Collection<ForumListItem> forums = new ArrayList<>();
-				for (Forum f : forumManager.getForums()) {
-					try {
-						GroupCount count =
-								forumManager.getGroupCount(f.getId());
-						forums.add(new ForumListItem(f, count));
-					} catch (NoSuchGroupException e) {
-						// Continue
-					}
-				}
-				logDuration(LOG, "Full load", start);
-				displayForums(revision, forums);
-			} catch (DbException e) {
-				logException(LOG, WARNING, e);
-			}
-		});
-	}
-
-	private void displayForums(int revision, Collection<ForumListItem> forums) {
-		runOnUiThreadUnlessDestroyed(() -> {
-			if (revision == adapter.getRevision()) {
-				adapter.incrementRevision();
-				if (forums.isEmpty()) list.showData();
-				else adapter.replaceAll(forums);
-			} else {
-				LOG.info("Concurrent update, reloading");
-				loadForums();
-			}
-		});
-	}
-
-	private void loadAvailableForums() {
-		listener.runOnDbThread(() -> {
-			try {
-				long start = now();
-				int available = forumSharingManager.getInvitations().size();
-				logDuration(LOG, "Loading available", start);
-				displayAvailableForums(available);
-			} catch (DbException e) {
-				logException(LOG, WARNING, e);
-			}
-		});
-	}
-
-	private void displayAvailableForums(int availableCount) {
-		runOnUiThreadUnlessDestroyed(() -> {
-			if (availableCount == 0) {
-				snackbar.dismiss();
-			} else {
-				snackbar.setText(getResources().getQuantityString(
-						R.plurals.forums_shared, availableCount,
-						availableCount));
-				if (!snackbar.isShownOrQueued()) snackbar.show();
-			}
-		});
-	}
-
-	@Override
-	public void eventOccurred(Event e) {
-		if (e instanceof ContactRemovedEvent) {
-			LOG.info("Contact removed, reloading available forums");
-			loadAvailableForums();
-		} else if (e instanceof GroupAddedEvent) {
-			GroupAddedEvent g = (GroupAddedEvent) e;
-			if (g.getGroup().getClientId().equals(CLIENT_ID)) {
-				LOG.info("Forum added, reloading forums");
-				loadForums();
-			}
-		} else if (e instanceof GroupRemovedEvent) {
-			GroupRemovedEvent g = (GroupRemovedEvent) e;
-			if (g.getGroup().getClientId().equals(CLIENT_ID)) {
-				LOG.info("Forum removed, removing from list");
-				removeForum(g.getGroup().getId());
-			}
-		} else if (e instanceof ForumPostReceivedEvent) {
-			ForumPostReceivedEvent f = (ForumPostReceivedEvent) e;
-			LOG.info("Forum post added, updating item");
-			updateItem(f.getGroupId(), f.getHeader());
-		} else if (e instanceof ForumInvitationRequestReceivedEvent) {
-			LOG.info("Forum invitation received, reloading available forums");
-			loadAvailableForums();
-		}
-	}
-
-	@UiThread
-	private void updateItem(GroupId g, ForumPostHeader m) {
-		adapter.incrementRevision();
-		int position = adapter.findItemPosition(g);
-		ForumListItem item = adapter.getItemAt(position);
-		if (item != null) {
-			item.addHeader(m);
-			adapter.updateItemAt(position, item);
-		}
-	}
-
-	@UiThread
-	private void removeForum(GroupId g) {
-		adapter.incrementRevision();
-		int position = adapter.findItemPosition(g);
-		ForumListItem item = adapter.getItemAt(position);
-		if (item != null) adapter.remove(item);
+		return super.onOptionsItemSelected(item);
 	}
 
 	@Override

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

@@ -4,12 +4,16 @@ import org.briarproject.briar.api.client.MessageTracker.GroupCount;
 import org.briarproject.briar.api.forum.Forum;
 import org.briarproject.briar.api.forum.ForumPostHeader;
 
-// This class is NOT thread-safe
-class ForumListItem {
+import javax.annotation.concurrent.Immutable;
+
+import androidx.annotation.Nullable;
+
+@Immutable
+class ForumListItem implements Comparable<ForumListItem> {
 
 	private final Forum forum;
-	private int postCount, unread;
-	private long timestamp;
+	private final int postCount, unread;
+	private final long timestamp;
 
 	ForumListItem(Forum forum, GroupCount count) {
 		this.forum = forum;
@@ -18,10 +22,11 @@ class ForumListItem {
 		this.timestamp = count.getLatestMsgTime();
 	}
 
-	void addHeader(ForumPostHeader h) {
-		postCount++;
-		if (!h.isRead()) unread++;
-		if (h.getTimestamp() > timestamp) timestamp = h.getTimestamp();
+	ForumListItem(ForumListItem item, ForumPostHeader h) {
+		this.forum = item.forum;
+		this.postCount = item.postCount + 1;
+		this.unread = item.unread + (h.isRead() ? 0 : 1);
+		this.timestamp = Math.max(item.timestamp, h.getTimestamp());
 	}
 
 	Forum getForum() {
@@ -43,4 +48,29 @@ class ForumListItem {
 	int getUnreadCount() {
 		return unread;
 	}
+
+	@Override
+	public int hashCode() {
+		return forum.getId().hashCode();
+	}
+
+	@Override
+	public boolean equals(@Nullable Object o) {
+		return o instanceof ForumListItem && getForum().equals(
+				((ForumListItem) o).getForum());
+	}
+
+	@Override
+	public int compareTo(ForumListItem o) {
+		if (this == o) return 0;
+		// The forum with the newest message comes first
+		long aTime = getTimestamp(), bTime = o.getTimestamp();
+		if (aTime > bTime) return -1;
+		if (aTime < bTime) return 1;
+		// Break ties by forum name
+		String aName = getForum().getName();
+		String bName = o.getForum().getName();
+		return String.CASE_INSENSITIVE_ORDER.compare(aName, bName);
+	}
+
 }

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

@@ -0,0 +1,187 @@
+package org.briarproject.briar.android.forum;
+
+import android.app.Application;
+
+import org.briarproject.bramble.api.contact.event.ContactRemovedEvent;
+import org.briarproject.bramble.api.db.DatabaseExecutor;
+import org.briarproject.bramble.api.db.DbException;
+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;
+import org.briarproject.bramble.api.event.EventListener;
+import org.briarproject.bramble.api.lifecycle.LifecycleManager;
+import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
+import org.briarproject.bramble.api.sync.GroupId;
+import org.briarproject.bramble.api.sync.event.GroupAddedEvent;
+import org.briarproject.bramble.api.sync.event.GroupRemovedEvent;
+import org.briarproject.bramble.api.system.AndroidExecutor;
+import org.briarproject.briar.android.viewmodel.DbViewModel;
+import org.briarproject.briar.android.viewmodel.LiveResult;
+import org.briarproject.briar.api.android.AndroidNotificationManager;
+import org.briarproject.briar.api.client.MessageTracker.GroupCount;
+import org.briarproject.briar.api.forum.Forum;
+import org.briarproject.briar.api.forum.ForumManager;
+import org.briarproject.briar.api.forum.ForumPostHeader;
+import org.briarproject.briar.api.forum.ForumSharingManager;
+import org.briarproject.briar.api.forum.event.ForumInvitationRequestReceivedEvent;
+import org.briarproject.briar.api.forum.event.ForumPostReceivedEvent;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import androidx.annotation.UiThread;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+
+import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
+import static org.briarproject.bramble.util.LogUtils.logDuration;
+import static org.briarproject.bramble.util.LogUtils.logException;
+import static org.briarproject.bramble.util.LogUtils.now;
+import static org.briarproject.briar.api.forum.ForumManager.CLIENT_ID;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+class ForumListViewModel extends DbViewModel implements EventListener {
+
+	private static final Logger LOG =
+			getLogger(ForumListViewModel.class.getName());
+
+	private final ForumManager forumManager;
+	private final ForumSharingManager forumSharingManager;
+	private final AndroidNotificationManager notificationManager;
+	private final EventBus eventBus;
+
+	private final MutableLiveData<LiveResult<List<ForumListItem>>> forumItems =
+			new MutableLiveData<>();
+	private final MutableLiveData<Integer> numInvitations =
+			new MutableLiveData<>();
+
+	@Inject
+	ForumListViewModel(Application application,
+			@DatabaseExecutor Executor dbExecutor,
+			LifecycleManager lifecycleManager,
+			TransactionManager db,
+			AndroidExecutor androidExecutor,
+			ForumManager forumManager,
+			ForumSharingManager forumSharingManager,
+			AndroidNotificationManager notificationManager, EventBus eventBus) {
+		super(application, dbExecutor, lifecycleManager, db, androidExecutor);
+		this.forumManager = forumManager;
+		this.forumSharingManager = forumSharingManager;
+		this.notificationManager = notificationManager;
+		this.eventBus = eventBus;
+		this.eventBus.addListener(this);
+	}
+
+	@Override
+	protected void onCleared() {
+		super.onCleared();
+		eventBus.removeListener(this);
+	}
+
+	void clearAllForumPostNotifications() {
+		notificationManager.clearAllForumPostNotifications();
+	}
+
+	void blockAllForumPostNotifications() {
+		notificationManager.blockAllForumPostNotifications();
+	}
+
+	void unblockAllForumPostNotifications() {
+		notificationManager.unblockAllForumPostNotifications();
+	}
+
+	@Override
+	public void eventOccurred(Event e) {
+		if (e instanceof ContactRemovedEvent) {
+			LOG.info("Contact removed, reloading available forums");
+			loadForumInvitations();
+		} else if (e instanceof ForumInvitationRequestReceivedEvent) {
+			LOG.info("Forum invitation received, reloading available forums");
+			loadForumInvitations();
+		} else if (e instanceof GroupAddedEvent) {
+			GroupAddedEvent g = (GroupAddedEvent) e;
+			if (g.getGroup().getClientId().equals(CLIENT_ID)) {
+				LOG.info("Forum added, reloading forums");
+				loadForums();
+			}
+		} else if (e instanceof GroupRemovedEvent) {
+			GroupRemovedEvent g = (GroupRemovedEvent) e;
+			if (g.getGroup().getClientId().equals(CLIENT_ID)) {
+				LOG.info("Forum removed, removing from list");
+				onGroupRemoved(g.getGroup().getId());
+			}
+		} else if (e instanceof ForumPostReceivedEvent) {
+			ForumPostReceivedEvent f = (ForumPostReceivedEvent) e;
+			LOG.info("Forum post added, updating item");
+			onForumPostReceived(f.getGroupId(), f.getHeader());
+		}
+	}
+
+	public void loadForums() {
+		loadList(this::loadForums, forumItems::setValue);
+	}
+
+	@DatabaseExecutor
+	private List<ForumListItem> loadForums(Transaction txn) throws DbException {
+		long start = now();
+		List<ForumListItem> forums = new ArrayList<>();
+		for (Forum f : forumManager.getForums(txn)) {
+			GroupCount count = forumManager.getGroupCount(txn, f.getId());
+			forums.add(new ForumListItem(f, count));
+		}
+		Collections.sort(forums);
+		logDuration(LOG, "Loading forums", start);
+		return forums;
+	}
+
+	@UiThread
+	private void onForumPostReceived(GroupId g, ForumPostHeader header) {
+		List<ForumListItem> list = updateListItems(forumItems,
+				itemToTest -> itemToTest.getForum().getId().equals(g),
+				itemToUpdate -> new ForumListItem(itemToUpdate, header));
+		if (list == null) return;
+		// re-sort as the order of items may have changed
+		Collections.sort(list);
+		forumItems.setValue(new LiveResult<>(list));
+	}
+
+	@UiThread
+	private void onGroupRemoved(GroupId groupId) {
+		List<ForumListItem> list = removeListItems(forumItems, i ->
+				i.getForum().getId().equals(groupId)
+		);
+		if (list == null) return;
+		forumItems.setValue(new LiveResult<>(list));
+	}
+
+	void loadForumInvitations() {
+		runOnDbThread(() -> {
+			try {
+				long start = now();
+				int available = forumSharingManager.getInvitations().size();
+				logDuration(LOG, "Loading available", start);
+				numInvitations.postValue(available);
+			} catch (DbException e) {
+				logException(LOG, WARNING, e);
+			}
+		});
+	}
+
+	LiveData<LiveResult<List<ForumListItem>>> getForumListItems() {
+		return forumItems;
+	}
+
+	LiveData<Integer> getNumInvitations() {
+		return numInvitations;
+	}
+
+}

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

@@ -2,13 +2,25 @@ package org.briarproject.briar.android.forum;
 
 import org.briarproject.briar.android.activity.ActivityScope;
 import org.briarproject.briar.android.activity.BaseActivity;
+import org.briarproject.briar.android.viewmodel.ViewModelKey;
 
+import androidx.lifecycle.ViewModel;
+import dagger.Binds;
 import dagger.Module;
 import dagger.Provides;
+import dagger.multibindings.IntoMap;
 
 @Module
 public class ForumModule {
 
+	@Module
+	public interface BindsModule {
+		@Binds
+		@IntoMap
+		@ViewModelKey(ForumListViewModel.class)
+		ViewModel bindForumListViewModel(ForumListViewModel forumListViewModel);
+	}
+
 	@ActivityScope
 	@Provides
 	ForumController provideForumController(BaseActivity activity,

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

@@ -10,15 +10,15 @@ import javax.annotation.Nullable;
 import javax.annotation.concurrent.NotThreadSafe;
 
 @NotThreadSafe
-class ForumItem extends ThreadItem {
+class ForumPostItem extends ThreadItem {
 
-	ForumItem(ForumPostHeader h, String text) {
+	ForumPostItem(ForumPostHeader h, String text) {
 		super(h.getId(), h.getParentId(), text, h.getTimestamp(), h.getAuthor(),
 				h.getAuthorInfo(), h.isRead());
 	}
 
-	ForumItem(MessageId messageId, @Nullable MessageId parentId, String text,
-			long timestamp, Author author, AuthorInfo authorInfo) {
+	ForumPostItem(MessageId messageId, @Nullable MessageId parentId,
+			String text, long timestamp, Author author, AuthorInfo authorInfo) {
 		super(messageId, parentId, text, timestamp, author, authorInfo, true);
 	}
 

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

@@ -0,0 +1,77 @@
+package org.briarproject.briar.android.forum;
+
+import android.content.Context;
+import android.content.Intent;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import org.briarproject.briar.R;
+import org.briarproject.briar.android.util.UiUtils;
+import org.briarproject.briar.android.view.TextAvatarView;
+import org.briarproject.briar.api.forum.Forum;
+
+import androidx.recyclerview.widget.RecyclerView;
+
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
+import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
+import static org.briarproject.briar.android.activity.BriarActivity.GROUP_NAME;
+
+class ForumViewHolder extends RecyclerView.ViewHolder {
+
+	private final Context ctx;
+	private final ViewGroup layout;
+	private final TextAvatarView avatar;
+	private final TextView name;
+	private final TextView postCount;
+	private final TextView date;
+
+	ForumViewHolder(View v) {
+		super(v);
+		ctx = v.getContext();
+		layout = (ViewGroup) v;
+		avatar = v.findViewById(R.id.avatarView);
+		name = v.findViewById(R.id.forumNameView);
+		postCount = v.findViewById(R.id.postCountView);
+		date = v.findViewById(R.id.dateView);
+	}
+
+	void bind(ForumListItem item) {
+		// Avatar
+		avatar.setText(item.getForum().getName().substring(0, 1));
+		avatar.setBackgroundBytes(item.getForum().getId().getBytes());
+		avatar.setUnreadCount(item.getUnreadCount());
+
+		// Forum Name
+		name.setText(item.getForum().getName());
+
+		// Post Count
+		int count = item.getPostCount();
+		if (count > 0) {
+			postCount.setText(ctx.getResources()
+					.getQuantityString(R.plurals.posts, count, count));
+		} else {
+			postCount.setText(ctx.getString(R.string.no_posts));
+		}
+
+		// Date
+		if (item.isEmpty()) {
+			date.setVisibility(GONE);
+		} else {
+			long timestamp = item.getTimestamp();
+			date.setText(UiUtils.formatDate(ctx, timestamp));
+			date.setVisibility(VISIBLE);
+		}
+
+		// Open Forum on Click
+		layout.setOnClickListener(v -> {
+			Intent i = new Intent(ctx, ForumActivity.class);
+			Forum f = item.getForum();
+			i.putExtra(GROUP_ID, f.getId().getBytes());
+			i.putExtra(GROUP_NAME, f.getName());
+			ctx.startActivity(i);
+		});
+	}
+
+}

briar-android/src/main/java/org/briarproject/briar/android/fragment/BaseFragment.java

@@ -5,7 +5,6 @@ import android.content.Context;
 import android.os.Bundle;
 import android.view.MenuItem;
 
-import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.android.DestroyableContext;
@@ -77,7 +76,7 @@ public abstract class BaseFragment extends Fragment
 		void showNextFragment(BaseFragment f);
 
 		@UiThread
-		void handleDbException(DbException e);
+		void handleException(Exception e);
 	}
 
 	@CallSuper
@@ -100,8 +99,8 @@ public abstract class BaseFragment extends Fragment
 	}
 
 	@UiThread
-	protected void handleDbException(DbException e) {
-		listener.handleDbException(e);
+	protected void handleException(Exception e) {
+		listener.handleException(e);
 	}
 
 }

briar-android/src/main/java/org/briarproject/briar/android/fragment/ScreenFilterDialogFragment.java

@@ -5,6 +5,7 @@ import android.app.Activity;
 import android.app.Dialog;
 import android.content.Context;
 import android.content.DialogInterface;
+import android.content.Intent;
 import android.os.Bundle;
 import android.text.TextUtils;
 import android.view.LayoutInflater;
@@ -28,6 +29,10 @@ import javax.inject.Inject;
 import androidx.appcompat.app.AlertDialog;
 import androidx.fragment.app.DialogFragment;
 
+import static android.os.Build.VERSION.SDK_INT;
+import static android.provider.Settings.ACTION_MANAGE_OVERLAY_PERMISSION;
+import static android.view.View.GONE;
+
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 public class ScreenFilterDialogFragment extends DialogFragment {
@@ -37,7 +42,7 @@ public class ScreenFilterDialogFragment extends DialogFragment {
 	@Inject
 	ScreenFilterMonitor screenFilterMonitor;
 
-	DismissListener dismissListener = null;
+	private DismissListener dismissListener = null;
 
 	public static ScreenFilterDialogFragment newInstance(
 			Collection<AppDetails> apps) {
@@ -83,10 +88,20 @@ public class ScreenFilterDialogFragment extends DialogFragment {
 		View dialogView = inflater.inflate(R.layout.dialog_screen_filter, null);
 		builder.setView(dialogView);
 		TextView message = dialogView.findViewById(R.id.screen_filter_message);
-		message.setText(getString(R.string.screen_filter_body,
-				TextUtils.join("\n", appNames)));
 		CheckBox allow = dialogView.findViewById(R.id.screen_filter_checkbox);
-		builder.setNeutralButton(R.string.continue_button, (dialog, which) -> {
+		if (SDK_INT <= 29) {
+			message.setText(getString(R.string.screen_filter_body,
+					TextUtils.join("\n", appNames)));
+		} else {
+			message.setText(R.string.screen_filter_body_api_30);
+			allow.setVisibility(GONE);
+			builder.setNeutralButton(R.string.screen_filter_review_apps,
+					(dialog, which) -> {
+						Intent i = new Intent(ACTION_MANAGE_OVERLAY_PERMISSION);
+						startActivity(i);
+					});
+		}
+		builder.setPositiveButton(R.string.continue_button, (dialog, which) -> {
 			if (allow.isChecked()) screenFilterMonitor.allowApps(packageNames);
 			dialog.dismiss();
 		});

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) {

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

@@ -10,14 +10,11 @@ import android.widget.TextView;
 
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
-import org.briarproject.bramble.api.system.AndroidExecutor;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.fragment.BaseFragment;
 import org.briarproject.briar.android.util.UiUtils;
 
-import javax.inject.Inject;
-
 import androidx.annotation.Nullable;
 import androidx.fragment.app.FragmentActivity;
 
@@ -41,9 +38,6 @@ public class ContactExchangeErrorFragment extends BaseFragment {
 		return f;
 	}
 
-	@Inject
-	AndroidExecutor androidExecutor;
-
 	@Override
 	public String getUniqueTag() {
 		return TAG;
@@ -88,8 +82,8 @@ public class ContactExchangeErrorFragment extends BaseFragment {
 	}
 
 	private void triggerFeedback() {
+		UiUtils.triggerFeedback(requireContext());
 		finish();
-		UiUtils.triggerFeedback(androidExecutor);
 	}
 
 }

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/navdrawer/NavDrawerActivity.java

@@ -17,7 +17,6 @@ import android.widget.TextView;
 import com.google.android.material.navigation.NavigationView;
 import com.google.android.material.navigation.NavigationView.OnNavigationItemSelectedListener;
 
-import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
@@ -365,7 +364,7 @@ public class NavDrawerActivity extends BriarActivity implements
 	}
 
 	@Override
-	public void handleDbException(DbException e) {
+	public void handleException(Exception e) {
 		// Do nothing for now
 	}
 

briar-android/src/main/java/org/briarproject/briar/android/navdrawer/NavDrawerViewModel.java

@@ -4,9 +4,13 @@ import android.app.Application;
 
 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.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.settings.Settings;
 import org.briarproject.bramble.api.settings.SettingsManager;
+import org.briarproject.bramble.api.system.AndroidExecutor;
+import org.briarproject.briar.android.viewmodel.DbViewModel;
 
 import java.util.concurrent.Executor;
 import java.util.logging.Logger;
@@ -14,7 +18,6 @@ import java.util.logging.Logger;
 import javax.inject.Inject;
 
 import androidx.annotation.UiThread;
-import androidx.lifecycle.AndroidViewModel;
 import androidx.lifecycle.LiveData;
 import androidx.lifecycle.MutableLiveData;
 
@@ -28,7 +31,7 @@ import static org.briarproject.briar.android.settings.SettingsFragment.SETTINGS_
 import static org.briarproject.briar.android.util.UiUtils.needsDozeWhitelisting;
 
 @NotNullByDefault
-public class NavDrawerViewModel extends AndroidViewModel {
+public class NavDrawerViewModel extends DbViewModel {
 
 	private static final Logger LOG =
 			getLogger(NavDrawerViewModel.class.getName());
@@ -37,8 +40,6 @@ public class NavDrawerViewModel extends AndroidViewModel {
 	private static final String SHOW_TRANSPORTS_ONBOARDING =
 			"showTransportsOnboarding";
 
-	@DatabaseExecutor
-	private final Executor dbExecutor;
 	private final SettingsManager settingsManager;
 
 	private final MutableLiveData<Boolean> showExpiryWarning =
@@ -49,10 +50,13 @@ public class NavDrawerViewModel extends AndroidViewModel {
 			new MutableLiveData<>();
 
 	@Inject
-	NavDrawerViewModel(Application app, @DatabaseExecutor Executor dbExecutor,
+	NavDrawerViewModel(Application app,
+			@DatabaseExecutor Executor dbExecutor,
+			LifecycleManager lifecycleManager,
+			TransactionManager db,
+			AndroidExecutor androidExecutor,
 			SettingsManager settingsManager) {
-		super(app);
-		this.dbExecutor = dbExecutor;
+		super(app, dbExecutor, lifecycleManager, db, androidExecutor);
 		this.settingsManager = settingsManager;
 	}
 
@@ -62,7 +66,7 @@ public class NavDrawerViewModel extends AndroidViewModel {
 
 	@UiThread
 	void checkExpiryWarning() {
-		dbExecutor.execute(() -> {
+		runOnDbThread(() -> {
 			try {
 				Settings settings =
 						settingsManager.getSettings(SETTINGS_NAMESPACE);
@@ -97,7 +101,7 @@ public class NavDrawerViewModel extends AndroidViewModel {
 	@UiThread
 	void expiryWarningDismissed() {
 		showExpiryWarning.setValue(false);
-		dbExecutor.execute(() -> {
+		runOnDbThread(() -> {
 			try {
 				Settings settings = new Settings();
 				int date = (int) (System.currentTimeMillis() / 1000L);
@@ -120,7 +124,7 @@ public class NavDrawerViewModel extends AndroidViewModel {
 			shouldAskForDozeWhitelisting.setValue(false);
 			return;
 		}
-		dbExecutor.execute(() -> {
+		runOnDbThread(() -> {
 			try {
 				Settings settings =
 						settingsManager.getSettings(SETTINGS_NAMESPACE);
@@ -141,7 +145,7 @@ public class NavDrawerViewModel extends AndroidViewModel {
 	@UiThread
 	void checkTransportsOnboarding() {
 		if (showTransportsOnboarding.getValue() != null) return;
-		dbExecutor.execute(() -> {
+		runOnDbThread(() -> {
 			try {
 				Settings settings =
 						settingsManager.getSettings(SETTINGS_NAMESPACE);
@@ -157,7 +161,7 @@ public class NavDrawerViewModel extends AndroidViewModel {
 	@UiThread
 	void transportsOnboardingShown() {
 		showTransportsOnboarding.setValue(false);
-		dbExecutor.execute(() -> {
+		runOnDbThread(() -> {
 			try {
 				Settings settings = new Settings();
 				settings.putBoolean(SHOW_TRANSPORTS_ONBOARDING, false);

briar-android/src/main/java/org/briarproject/briar/android/navdrawer/PluginViewModel.java

@@ -9,9 +9,11 @@ import android.content.IntentFilter;
 
 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.event.Event;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.event.EventListener;
+import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.network.NetworkManager;
 import org.briarproject.bramble.api.network.NetworkStatus;
 import org.briarproject.bramble.api.network.event.NetworkStatusEvent;
@@ -27,6 +29,8 @@ import org.briarproject.bramble.api.plugin.event.TransportStateEvent;
 import org.briarproject.bramble.api.settings.Settings;
 import org.briarproject.bramble.api.settings.SettingsManager;
 import org.briarproject.bramble.api.settings.event.SettingsUpdatedEvent;
+import org.briarproject.bramble.api.system.AndroidExecutor;
+import org.briarproject.briar.android.viewmodel.DbViewModel;
 
 import java.util.concurrent.Executor;
 import java.util.logging.Logger;
@@ -34,7 +38,6 @@ import java.util.logging.Logger;
 import javax.inject.Inject;
 
 import androidx.annotation.Nullable;
-import androidx.lifecycle.AndroidViewModel;
 import androidx.lifecycle.LiveData;
 import androidx.lifecycle.MutableLiveData;
 
@@ -51,13 +54,12 @@ import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.LogUtils.now;
 
 @NotNullByDefault
-public class PluginViewModel extends AndroidViewModel implements EventListener {
+public class PluginViewModel extends DbViewModel implements EventListener {
 
 	private static final Logger LOG =
 			getLogger(PluginViewModel.class.getName());
 
 	private final Application app;
-	private final Executor dbExecutor;
 	private final SettingsManager settingsManager;
 	private final PluginManager pluginManager;
 	private final EventBus eventBus;
@@ -85,11 +87,12 @@ public class PluginViewModel extends AndroidViewModel implements EventListener {
 
 	@Inject
 	PluginViewModel(Application app, @DatabaseExecutor Executor dbExecutor,
-			SettingsManager settingsManager, PluginManager pluginManager,
-			EventBus eventBus, NetworkManager networkManager) {
-		super(app);
+			LifecycleManager lifecycleManager, TransactionManager db,
+			AndroidExecutor androidExecutor, SettingsManager settingsManager,
+			PluginManager pluginManager, EventBus eventBus,
+			NetworkManager networkManager) {
+		super(app, dbExecutor, lifecycleManager, db, androidExecutor);
 		this.app = app;
-		this.dbExecutor = dbExecutor;
 		this.settingsManager = settingsManager;
 		this.pluginManager = pluginManager;
 		this.eventBus = eventBus;
@@ -182,7 +185,7 @@ public class PluginViewModel extends AndroidViewModel implements EventListener {
 	}
 
 	private void loadSettings() {
-		dbExecutor.execute(() -> {
+		runOnDbThread(() -> {
 			try {
 				boolean tor = isPluginEnabled(TorConstants.ID,
 						TorConstants.DEFAULT_PREF_PLUGIN_ENABLE);
@@ -219,7 +222,7 @@ public class PluginViewModel extends AndroidViewModel implements EventListener {
 	}
 
 	private void mergeSettings(Settings s, String namespace) {
-		dbExecutor.execute(() -> {
+		runOnDbThread(() -> {
 			try {
 				long start = now();
 				settingsManager.mergeSettings(s, namespace);
@@ -235,8 +238,7 @@ public class PluginViewModel extends AndroidViewModel implements EventListener {
 		@Override
 		public void onReceive(Context context, Intent intent) {
 			int state = intent.getIntExtra(EXTRA_STATE, 0);
-			if (state == STATE_ON) bluetoothTurnedOn.postValue(true);
-			else bluetoothTurnedOn.postValue(false);
+			bluetoothTurnedOn.postValue(state == STATE_ON);
 		}
 	}
 }

briar-android/src/main/java/org/briarproject/briar/android/panic/PanicPreferencesFragment.java

@@ -82,6 +82,7 @@ public class PanicPreferencesFragment extends PreferenceFragmentCompat
 		entries.add(0, getString(R.string.panic_app_setting_none));
 		entryValues.add(0, PACKAGE_NAME_NONE);
 
+		// only info.guardianproject.ripple is whitelisted in manifest
 		for (ResolveInfo resolveInfo : PanicResponder.resolveTriggerApps(pm)) {
 			if (resolveInfo.activityInfo == null)
 				continue;

briar-android/src/main/java/org/briarproject/briar/android/privategroup/conversation/GroupActivity.java

@@ -106,7 +106,7 @@ public class GroupActivity extends
 
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 	}
@@ -125,7 +125,7 @@ public class GroupActivity extends
 
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 	}
@@ -264,7 +264,7 @@ public class GroupActivity extends
 					// GroupRemovedEvent being fired
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 	}

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

@@ -51,7 +51,7 @@ public class CreateGroupActivity extends BriarActivity
 
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 	}

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

@@ -69,7 +69,7 @@ public class GroupInviteActivity extends ContactSelectorActivity
 					@Override
 					public void onExceptionUi(DbException exception) {
 						setResult(RESULT_CANCELED);
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 	}

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/GroupItem.java

@@ -8,15 +8,19 @@ import org.briarproject.briar.api.client.MessageTracker.GroupCount;
 import org.briarproject.briar.api.privategroup.GroupMessageHeader;
 import org.briarproject.briar.api.privategroup.PrivateGroup;
 
-// This class is not thread-safe
+import javax.annotation.concurrent.Immutable;
+
+import androidx.annotation.Nullable;
+
+@Immutable
 @NotNullByDefault
-class GroupItem {
+class GroupItem implements Comparable<GroupItem> {
 
 	private final PrivateGroup privateGroup;
 	private final AuthorInfo authorInfo;
-	private int messageCount, unreadCount;
-	private long timestamp;
-	private boolean dissolved;
+	private final int messageCount, unreadCount;
+	private final long timestamp;
+	private final boolean dissolved;
 
 	GroupItem(PrivateGroup privateGroup, AuthorInfo authorInfo,
 			GroupCount count, boolean dissolved) {
@@ -28,18 +32,22 @@ class GroupItem {
 		this.dissolved = dissolved;
 	}
 
-	void addMessageHeader(GroupMessageHeader header) {
-		messageCount++;
-		if (header.getTimestamp() > timestamp) {
-			timestamp = header.getTimestamp();
-		}
-		if (!header.isRead()) {
-			unreadCount++;
-		}
+	GroupItem(GroupItem item, GroupMessageHeader header) {
+		this.privateGroup = item.privateGroup;
+		this.authorInfo = item.authorInfo;
+		this.messageCount = item.messageCount + 1;
+		this.unreadCount = item.unreadCount + (header.isRead() ? 0 : 1);
+		this.timestamp = Math.max(header.getTimestamp(), item.timestamp);
+		this.dissolved = item.dissolved;
 	}
 
-	PrivateGroup getPrivateGroup() {
-		return privateGroup;
+	GroupItem(GroupItem item, boolean isDissolved) {
+		this.privateGroup = item.privateGroup;
+		this.authorInfo = item.authorInfo;
+		this.messageCount = item.messageCount;
+		this.unreadCount = item.unreadCount;
+		this.timestamp = item.timestamp;
+		this.dissolved = isDissolved;
 	}
 
 	GroupId getId() {
@@ -78,8 +86,27 @@ class GroupItem {
 		return dissolved;
 	}
 
-	void setDissolved() {
-		dissolved = true;
+	@Override
+	public int hashCode() {
+		return getId().hashCode();
 	}
 
+	@Override
+	public boolean equals(@Nullable Object o) {
+		return o instanceof GroupItem &&
+				getId().equals(((GroupItem) o).getId());
+	}
+
+	@Override
+	public int compareTo(GroupItem o) {
+		if (this == o) return 0;
+		// The group with the latest message comes first
+		long aTime = getTimestamp(), bTime = o.getTimestamp();
+		if (aTime > bTime) return -1;
+		if (aTime < bTime) return 1;
+		// Break ties by group name
+		String aName = getName();
+		String bName = o.getName();
+		return String.CASE_INSENSITIVE_ORDER.compare(aName, bName);
+	}
 }

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

@@ -1,81 +1,52 @@
 package org.briarproject.briar.android.privategroup.list;
 
-import android.content.Context;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
-import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.privategroup.list.GroupViewHolder.OnGroupRemoveClickListener;
-import org.briarproject.briar.android.util.BriarAdapter;
 
-import static androidx.recyclerview.widget.SortedList.INVALID_POSITION;
+import androidx.recyclerview.widget.DiffUtil.ItemCallback;
+import androidx.recyclerview.widget.ListAdapter;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
-class GroupListAdapter extends BriarAdapter<GroupItem, GroupViewHolder> {
+class GroupListAdapter extends ListAdapter<GroupItem, GroupViewHolder> {
 
 	private final OnGroupRemoveClickListener listener;
 
-	GroupListAdapter(Context ctx, OnGroupRemoveClickListener listener) {
-		super(ctx, GroupItem.class);
+	GroupListAdapter(OnGroupRemoveClickListener listener) {
+		super(new GroupItemCallback());
 		this.listener = listener;
 	}
 
 	@Override
 	public GroupViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
-		View v = LayoutInflater.from(ctx).inflate(
-				R.layout.list_item_group, parent, false);
+		View v = LayoutInflater.from(parent.getContext())
+				.inflate(R.layout.list_item_group, parent, false);
 		return new GroupViewHolder(v);
 	}
 
 	@Override
 	public void onBindViewHolder(GroupViewHolder ui, int position) {
-		ui.bindView(ctx, items.get(position), listener);
+		ui.bindView(getItem(position), listener);
 	}
 
-	@Override
-	public int compare(GroupItem a, GroupItem b) {
-		if (a == b) return 0;
-		// The group with the latest message comes first
-		long aTime = a.getTimestamp(), bTime = b.getTimestamp();
-		if (aTime > bTime) return -1;
-		if (aTime < bTime) return 1;
-		// Break ties by group name
-		String aName = a.getName();
-		String bName = b.getName();
-		return String.CASE_INSENSITIVE_ORDER.compare(aName, bName);
-	}
-
-	@Override
-	public boolean areContentsTheSame(GroupItem a, GroupItem b) {
-		return a.getMessageCount() == b.getMessageCount() &&
-				a.getTimestamp() == b.getTimestamp() &&
-				a.getUnreadCount() == b.getUnreadCount() &&
-				a.isDissolved() == b.isDissolved();
-	}
-
-	@Override
-	public boolean areItemsTheSame(GroupItem a, GroupItem b) {
-		return a.getId().equals(b.getId());
-	}
-
-	int findItemPosition(GroupId g) {
-		for (int i = 0; i < items.size(); i++) {
-			GroupItem item = items.get(i);
-			if (item.getId().equals(g)) {
-				return i;
-			}
+	private static class GroupItemCallback extends ItemCallback<GroupItem> {
+		@Override
+		public boolean areItemsTheSame(GroupItem a, GroupItem b) {
+			return a.equals(b);
 		}
-		return INVALID_POSITION;
-	}
 
-	void removeItem(GroupId groupId) {
-		int pos = findItemPosition(groupId);
-		if (pos != INVALID_POSITION) items.removeItemAt(pos);
+		@Override
+		public boolean areContentsTheSame(GroupItem a, GroupItem b) {
+			return a.getMessageCount() == b.getMessageCount() &&
+					a.getTimestamp() == b.getTimestamp() &&
+					a.getUnreadCount() == b.getUnreadCount() &&
+					a.isDissolved() == b.isDissolved();
+		}
 	}
-
 }

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

@@ -1,60 +0,0 @@
-package org.briarproject.briar.android.privategroup.list;
-
-import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.sync.GroupId;
-import org.briarproject.briar.android.controller.DbController;
-import org.briarproject.briar.android.controller.handler.ExceptionHandler;
-import org.briarproject.briar.android.controller.handler.ResultExceptionHandler;
-import org.briarproject.briar.api.privategroup.GroupMessageHeader;
-
-import java.util.Collection;
-
-import androidx.annotation.UiThread;
-
-@NotNullByDefault
-interface GroupListController extends DbController {
-
-	/**
-	 * The listener must be set right after the controller was injected
-	 */
-	@UiThread
-	void setGroupListListener(GroupListListener listener);
-
-	@UiThread
-	void unsetGroupListListener(GroupListListener listener);
-
-	@UiThread
-	void onStart();
-
-	@UiThread
-	void onStop();
-
-	void loadGroups(
-			ResultExceptionHandler<Collection<GroupItem>, DbException> result);
-
-	void removeGroup(GroupId g, ExceptionHandler<DbException> result);
-
-	void loadAvailableGroups(
-			ResultExceptionHandler<Integer, DbException> result);
-
-	interface GroupListListener {
-
-		@UiThread
-		void onGroupMessageAdded(GroupMessageHeader header);
-
-		@UiThread
-		void onGroupInvitationReceived();
-
-		@UiThread
-		void onGroupAdded(GroupId groupId);
-
-		@UiThread
-		void onGroupRemoved(GroupId groupId);
-
-		@UiThread
-		void onGroupDissolved(GroupId groupId);
-
-	}
-
-}

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

@@ -12,30 +12,22 @@ import android.view.ViewGroup;
 
 import com.google.android.material.snackbar.Snackbar;
 
-import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
-import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
-import org.briarproject.briar.android.controller.handler.UiExceptionHandler;
-import org.briarproject.briar.android.controller.handler.UiResultExceptionHandler;
 import org.briarproject.briar.android.fragment.BaseFragment;
 import org.briarproject.briar.android.privategroup.creation.CreateGroupActivity;
 import org.briarproject.briar.android.privategroup.invitation.GroupInvitationActivity;
-import org.briarproject.briar.android.privategroup.list.GroupListController.GroupListListener;
 import org.briarproject.briar.android.privategroup.list.GroupViewHolder.OnGroupRemoveClickListener;
 import org.briarproject.briar.android.util.BriarSnackbarBuilder;
 import org.briarproject.briar.android.view.BriarRecyclerView;
-import org.briarproject.briar.api.privategroup.GroupMessageHeader;
-
-import java.util.Collection;
-import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
 import androidx.annotation.UiThread;
+import androidx.lifecycle.ViewModelProvider;
 import androidx.recyclerview.widget.LinearLayoutManager;
 
 import static com.google.android.material.snackbar.Snackbar.LENGTH_INDEFINITE;
@@ -44,26 +36,26 @@ import static java.util.Objects.requireNonNull;
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
 public class GroupListFragment extends BaseFragment implements
-		GroupListListener, OnGroupRemoveClickListener, OnClickListener {
+		OnGroupRemoveClickListener, OnClickListener {
 
 	public final static String TAG = GroupListFragment.class.getName();
-	private static final Logger LOG = Logger.getLogger(TAG);
 
 	public static GroupListFragment newInstance() {
 		return new GroupListFragment();
 	}
 
 	@Inject
-	GroupListController controller;
+	ViewModelProvider.Factory viewModelFactory;
 
+	private GroupListViewModel viewModel;
 	private BriarRecyclerView list;
 	private GroupListAdapter adapter;
-	private Snackbar snackbar;
 
 	@Override
 	public void injectFragment(ActivityComponent component) {
 		component.inject(this);
-		controller.setGroupListListener(this);
+		viewModel = new ViewModelProvider(this, viewModelFactory)
+				.get(GroupListViewModel.class);
 	}
 
 	@Nullable
@@ -72,21 +64,36 @@ 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);
 
-		adapter = new GroupListAdapter(getActivity(), this);
+		adapter = new GroupListAdapter(this);
 		list = v.findViewById(R.id.list);
 		list.setEmptyImage(R.drawable.ic_empty_state_group_list);
 		list.setEmptyText(R.string.groups_list_empty);
 		list.setEmptyAction(R.string.groups_list_empty_action);
 		list.setLayoutManager(new LinearLayoutManager(getContext()));
 		list.setAdapter(adapter);
+		viewModel.getGroupItems().observe(getViewLifecycleOwner(), result ->
+				result.onError(this::handleException).onSuccess(items -> {
+					adapter.submitList(items);
+					if (requireNonNull(items).size() == 0) list.showData();
+				})
+		);
 
-		snackbar = new BriarSnackbarBuilder()
+		Snackbar snackbar = new BriarSnackbarBuilder()
 				.setAction(R.string.show, this)
 				.make(list, "", LENGTH_INDEFINITE);
+		viewModel.getNumInvitations().observe(getViewLifecycleOwner(), num -> {
+			if (num == 0) {
+				snackbar.dismiss();
+			} else {
+				snackbar.setText(getResources().getQuantityString(
+						R.plurals.groups_invitations_open, num, num));
+				if (!snackbar.isShownOrQueued()) snackbar.show();
+			}
+		});
 
 		return v;
 	}
@@ -94,25 +101,23 @@ public class GroupListFragment extends BaseFragment implements
 	@Override
 	public void onStart() {
 		super.onStart();
-		controller.onStart();
+		viewModel.blockAllGroupMessageNotifications();
+		viewModel.clearAllGroupMessageNotifications();
+		// The attributes and sorting of the groups may have changed while we
+		// were stopped and we have no way finding out about them, so re-load
+		// e.g. less unread messages in a group after viewing it.
+		viewModel.loadGroups();
+		// The number of invitations might have changed while we were stopped
+		// e.g. because of accepting an invitation which does not trigger event
+		viewModel.loadNumInvitations();
 		list.startPeriodicUpdate();
-		loadGroups();
-		loadAvailableGroups();
 	}
 
 	@Override
 	public void onStop() {
 		super.onStop();
-		controller.onStop();
 		list.stopPeriodicUpdate();
-		adapter.clear();
-		list.showProgressBar();
-	}
-
-	@Override
-	public void onDestroy() {
-		super.onDestroy();
-		controller.unsetGroupListListener(this);
+		viewModel.unblockAllGroupMessageNotifications();
 	}
 
 	@Override
@@ -123,68 +128,18 @@ public class GroupListFragment extends BaseFragment implements
 
 	@Override
 	public boolean onOptionsItemSelected(MenuItem item) {
-		switch (item.getItemId()) {
-			case R.id.action_add_group:
-				Intent i = new Intent(getContext(), CreateGroupActivity.class);
-				startActivity(i);
-				return true;
-			default:
-				return super.onOptionsItemSelected(item);
+		if (item.getItemId() == R.id.action_add_group) {
+			Intent i = new Intent(getContext(), CreateGroupActivity.class);
+			startActivity(i);
+			return true;
 		}
+		return super.onOptionsItemSelected(item);
 	}
 
 	@UiThread
 	@Override
 	public void onGroupRemoveClick(GroupItem item) {
-		controller.removeGroup(item.getId(),
-				new UiExceptionHandler<DbException>(this) {
-					// result handled by GroupRemovedEvent and onGroupRemoved()
-					@Override
-					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
-					}
-				});
-	}
-
-	@UiThread
-	@Override
-	public void onGroupMessageAdded(GroupMessageHeader header) {
-		adapter.incrementRevision();
-		int position = adapter.findItemPosition(header.getGroupId());
-		GroupItem item = adapter.getItemAt(position);
-		if (item != null) {
-			item.addMessageHeader(header);
-			adapter.updateItemAt(position, item);
-		}
-	}
-
-	@Override
-	public void onGroupInvitationReceived() {
-		loadAvailableGroups();
-	}
-
-	@UiThread
-	@Override
-	public void onGroupAdded(GroupId groupId) {
-		loadGroups();
-	}
-
-	@UiThread
-	@Override
-	public void onGroupRemoved(GroupId groupId) {
-		adapter.incrementRevision();
-		adapter.removeItem(groupId);
-	}
-
-	@Override
-	public void onGroupDissolved(GroupId groupId) {
-		adapter.incrementRevision();
-		int position = adapter.findItemPosition(groupId);
-		GroupItem item = adapter.getItemAt(position);
-		if (item != null) {
-			item.setDissolved();
-			adapter.updateItemAt(position, item);
-		}
+		viewModel.removeGroup(item.getId());
 	}
 
 	@Override
@@ -192,52 +147,6 @@ public class GroupListFragment extends BaseFragment implements
 		return TAG;
 	}
 
-	private void loadGroups() {
-		int revision = adapter.getRevision();
-		controller.loadGroups(
-				new UiResultExceptionHandler<Collection<GroupItem>, DbException>(
-						this) {
-					@Override
-					public void onResultUi(Collection<GroupItem> groups) {
-						if (revision == adapter.getRevision()) {
-							adapter.incrementRevision();
-							if (groups.isEmpty()) list.showData();
-							else adapter.replaceAll(groups);
-						} else {
-							LOG.info("Concurrent update, reloading");
-							loadGroups();
-						}
-					}
-
-					@Override
-					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
-					}
-				});
-	}
-
-	private void loadAvailableGroups() {
-		controller.loadAvailableGroups(
-				new UiResultExceptionHandler<Integer, DbException>(this) {
-					@Override
-					public void onResultUi(Integer num) {
-						if (num == 0) {
-							snackbar.dismiss();
-						} else {
-							snackbar.setText(getResources().getQuantityString(
-									R.plurals.groups_invitations_open, num,
-									num));
-							if (!snackbar.isShownOrQueued()) snackbar.show();
-						}
-					}
-
-					@Override
-					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
-					}
-				});
-	}
-
 	/**
 	 * This method is handling the available groups snackbar action
 	 */

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

@@ -1,17 +1,18 @@
 package org.briarproject.briar.android.privategroup.list;
 
-import org.briarproject.briar.android.activity.ActivityScope;
+import org.briarproject.briar.android.viewmodel.ViewModelKey;
 
+import androidx.lifecycle.ViewModel;
+import dagger.Binds;
 import dagger.Module;
-import dagger.Provides;
+import dagger.multibindings.IntoMap;
 
 @Module
-public class GroupListModule {
+public abstract class GroupListModule {
 
-	@ActivityScope
-	@Provides
-	GroupListController provideGroupListController(
-			GroupListControllerImpl groupListController) {
-		return groupListController;
-	}
+	@Binds
+	@IntoMap
+	@ViewModelKey(GroupListViewModel.class)
+	abstract ViewModel bindGroupListViewModel(
+			GroupListViewModel groupListViewModel);
 }

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

@@ -1,9 +1,12 @@
 package org.briarproject.briar.android.privategroup.list;
 
+import android.app.Application;
+
 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.NoSuchGroupException;
+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;
 import org.briarproject.bramble.api.event.EventListener;
@@ -16,11 +19,12 @@ import org.briarproject.bramble.api.sync.ClientId;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.bramble.api.sync.event.GroupAddedEvent;
 import org.briarproject.bramble.api.sync.event.GroupRemovedEvent;
-import org.briarproject.briar.android.controller.DbControllerImpl;
-import org.briarproject.briar.android.controller.handler.ExceptionHandler;
-import org.briarproject.briar.android.controller.handler.ResultExceptionHandler;
+import org.briarproject.bramble.api.system.AndroidExecutor;
+import org.briarproject.briar.android.viewmodel.DbViewModel;
+import org.briarproject.briar.android.viewmodel.LiveResult;
 import org.briarproject.briar.api.android.AndroidNotificationManager;
 import org.briarproject.briar.api.client.MessageTracker.GroupCount;
+import org.briarproject.briar.api.privategroup.GroupMessageHeader;
 import org.briarproject.briar.api.privategroup.PrivateGroup;
 import org.briarproject.briar.api.privategroup.PrivateGroupManager;
 import org.briarproject.briar.api.privategroup.event.GroupDissolvedEvent;
@@ -30,6 +34,7 @@ import org.briarproject.briar.api.privategroup.invitation.GroupInvitationManager
 
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -38,10 +43,13 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
-import androidx.annotation.CallSuper;
-import androidx.annotation.Nullable;
+import androidx.annotation.UiThread;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
 
+import static java.util.Objects.requireNonNull;
 import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
 import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.LogUtils.now;
@@ -49,11 +57,10 @@ import static org.briarproject.briar.api.privategroup.PrivateGroupManager.CLIENT
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
-class GroupListControllerImpl extends DbControllerImpl
-		implements GroupListController, EventListener {
+class GroupListViewModel extends DbViewModel implements EventListener {
 
 	private static final Logger LOG =
-			Logger.getLogger(GroupListControllerImpl.class.getName());
+			getLogger(GroupListViewModel.class.getName());
 
 	private final PrivateGroupManager groupManager;
 	private final GroupInvitationManager groupInvitationManager;
@@ -61,120 +68,137 @@ class GroupListControllerImpl extends DbControllerImpl
 	private final AndroidNotificationManager notificationManager;
 	private final EventBus eventBus;
 
-	// UI thread
-	@Nullable
-	private GroupListListener listener;
+	private final MutableLiveData<LiveResult<List<GroupItem>>> groupItems =
+			new MutableLiveData<>();
+	private final MutableLiveData<Integer> numInvitations =
+			new MutableLiveData<>();
 
 	@Inject
-	GroupListControllerImpl(@DatabaseExecutor Executor dbExecutor,
-			LifecycleManager lifecycleManager, PrivateGroupManager groupManager,
+	GroupListViewModel(Application application,
+			@DatabaseExecutor Executor dbExecutor,
+			LifecycleManager lifecycleManager,
+			TransactionManager db,
+			AndroidExecutor androidExecutor,
+			PrivateGroupManager groupManager,
 			GroupInvitationManager groupInvitationManager,
 			ContactManager contactManager,
 			AndroidNotificationManager notificationManager, EventBus eventBus) {
-		super(dbExecutor, lifecycleManager);
+		super(application, dbExecutor, lifecycleManager, db, androidExecutor);
 		this.groupManager = groupManager;
 		this.groupInvitationManager = groupInvitationManager;
 		this.contactManager = contactManager;
 		this.notificationManager = notificationManager;
 		this.eventBus = eventBus;
+		this.eventBus.addListener(this);
 	}
 
 	@Override
-	public void setGroupListListener(GroupListListener listener) {
-		this.listener = listener;
-	}
-
-	@Override
-	public void unsetGroupListListener(GroupListListener listener) {
-		if (this.listener == listener) this.listener = null;
-	}
-
-	@Override
-	@CallSuper
-	public void onStart() {
-		if (listener == null) throw new IllegalStateException();
-		eventBus.addListener(this);
-		notificationManager.clearAllGroupMessageNotifications();
-	}
-
-	@Override
-	@CallSuper
-	public void onStop() {
+	protected void onCleared() {
+		super.onCleared();
 		eventBus.removeListener(this);
 	}
 
+	void clearAllGroupMessageNotifications() {
+		notificationManager.clearAllGroupMessageNotifications();
+	}
+
+	void blockAllGroupMessageNotifications() {
+		notificationManager.blockAllGroupMessageNotifications();
+	}
+
+	void unblockAllGroupMessageNotifications() {
+		notificationManager.unblockAllGroupMessageNotifications();
+	}
+
 	@Override
-	@CallSuper
 	public void eventOccurred(Event e) {
-		if (listener == null) throw new IllegalStateException();
 		if (e instanceof GroupMessageAddedEvent) {
 			GroupMessageAddedEvent g = (GroupMessageAddedEvent) e;
 			LOG.info("Private group message added");
-			listener.onGroupMessageAdded(g.getHeader());
+			onGroupMessageAdded(g.getHeader());
 		} else if (e instanceof GroupInvitationRequestReceivedEvent) {
 			LOG.info("Private group invitation received");
-			listener.onGroupInvitationReceived();
+			loadNumInvitations();
 		} else if (e instanceof GroupAddedEvent) {
 			GroupAddedEvent g = (GroupAddedEvent) e;
 			ClientId id = g.getGroup().getClientId();
 			if (id.equals(CLIENT_ID)) {
 				LOG.info("Private group added");
-				listener.onGroupAdded(g.getGroup().getId());
+				loadGroups();
 			}
 		} else if (e instanceof GroupRemovedEvent) {
 			GroupRemovedEvent g = (GroupRemovedEvent) e;
 			ClientId id = g.getGroup().getClientId();
 			if (id.equals(CLIENT_ID)) {
 				LOG.info("Private group removed");
-				listener.onGroupRemoved(g.getGroup().getId());
+				onGroupRemoved(g.getGroup().getId());
 			}
 		} else if (e instanceof GroupDissolvedEvent) {
 			GroupDissolvedEvent g = (GroupDissolvedEvent) e;
 			LOG.info("Private group dissolved");
-			listener.onGroupDissolved(g.getGroupId());
+			onGroupDissolved(g.getGroupId());
 		}
 	}
 
-	@Override
-	public void loadGroups(
-			ResultExceptionHandler<Collection<GroupItem>, DbException> handler) {
-		runOnDbThread(() -> {
-			try {
-				long start = now();
-				Collection<PrivateGroup> groups =
-						groupManager.getPrivateGroups();
-				List<GroupItem> items = new ArrayList<>(groups.size());
-				Map<AuthorId, AuthorInfo> authorInfos = new HashMap<>();
-				for (PrivateGroup g : groups) {
-					try {
-						GroupId id = g.getId();
-						AuthorId authorId = g.getCreator().getId();
-						AuthorInfo authorInfo;
-						if (authorInfos.containsKey(authorId)) {
-							authorInfo = authorInfos.get(authorId);
-						} else {
-							authorInfo = contactManager.getAuthorInfo(authorId);
-							authorInfos.put(authorId, authorInfo);
-						}
-						GroupCount count = groupManager.getGroupCount(id);
-						boolean dissolved = groupManager.isDissolved(id);
-						items.add(
-								new GroupItem(g, authorInfo, count, dissolved));
-					} catch (NoSuchGroupException e) {
-						// Continue
-					}
-				}
-				logDuration(LOG, "Loading groups", start);
-				handler.onResult(items);
-			} catch (DbException e) {
-				logException(LOG, WARNING, e);
-				handler.onException(e);
-			}
-		});
+	void loadGroups() {
+		loadList(this::loadGroups, groupItems::setValue);
 	}
 
-	@Override
-	public void removeGroup(GroupId g, ExceptionHandler<DbException> handler) {
+	@DatabaseExecutor
+	private List<GroupItem> loadGroups(Transaction txn) throws DbException {
+		long start = now();
+		Collection<PrivateGroup> groups = groupManager.getPrivateGroups(txn);
+		List<GroupItem> items = new ArrayList<>(groups.size());
+		Map<AuthorId, AuthorInfo> authorInfos = new HashMap<>();
+		for (PrivateGroup g : groups) {
+			GroupId id = g.getId();
+			AuthorId authorId = g.getCreator().getId();
+			AuthorInfo authorInfo;
+			if (authorInfos.containsKey(authorId)) {
+				authorInfo = requireNonNull(authorInfos.get(authorId));
+			} else {
+				authorInfo = contactManager.getAuthorInfo(txn, authorId);
+				authorInfos.put(authorId, authorInfo);
+			}
+			GroupCount count = groupManager.getGroupCount(txn, id);
+			boolean dissolved = groupManager.isDissolved(txn, id);
+			items.add(new GroupItem(g, authorInfo, count, dissolved));
+		}
+		Collections.sort(items);
+		logDuration(LOG, "Loading groups", start);
+		return items;
+	}
+
+	@UiThread
+	private void onGroupMessageAdded(GroupMessageHeader header) {
+		GroupId g = header.getGroupId();
+		List<GroupItem> list = updateListItems(groupItems,
+				itemToTest -> itemToTest.getId().equals(g),
+				itemToUpdate -> new GroupItem(itemToUpdate, header));
+		if (list == null) return;
+		// re-sort as the order of items may have changed
+		Collections.sort(list);
+		groupItems.setValue(new LiveResult<>(list));
+	}
+
+	@UiThread
+	private void onGroupDissolved(GroupId groupId) {
+		List<GroupItem> list = updateListItems(groupItems,
+				itemToTest -> itemToTest.getId().equals(groupId),
+				itemToUpdate -> new GroupItem(itemToUpdate, true));
+		if (list == null) return;
+		groupItems.setValue(new LiveResult<>(list));
+	}
+
+	@UiThread
+	private void onGroupRemoved(GroupId groupId) {
+		List<GroupItem> list =
+				removeListItems(groupItems, i -> i.getId().equals(groupId));
+		if (list == null) return;
+		groupItems.setValue(new LiveResult<>(list));
+	}
+
+	void removeGroup(GroupId g) {
 		runOnDbThread(() -> {
 			try {
 				long start = now();
@@ -182,23 +206,26 @@ class GroupListControllerImpl extends DbControllerImpl
 				logDuration(LOG, "Removing group", start);
 			} catch (DbException e) {
 				logException(LOG, WARNING, e);
-				handler.onException(e);
 			}
 		});
 	}
 
-	@Override
-	public void loadAvailableGroups(
-			ResultExceptionHandler<Integer, DbException> handler) {
+	void loadNumInvitations() {
 		runOnDbThread(() -> {
 			try {
-				handler.onResult(
-						groupInvitationManager.getInvitations().size());
+				int i = groupInvitationManager.getInvitations().size();
+				numInvitations.postValue(i);
 			} catch (DbException e) {
 				logException(LOG, WARNING, e);
-				handler.onException(e);
 			}
 		});
 	}
 
+	LiveData<LiveResult<List<GroupItem>>> getGroupItems() {
+		return groupItems;
+	}
+
+	LiveData<Integer> getNumInvitations() {
+		return numInvitations;
+	}
 }

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

@@ -29,6 +29,7 @@ class GroupViewHolder extends RecyclerView.ViewHolder {
 
 	private final static float ALPHA = 0.42f;
 
+	private final Context ctx;
 	private final ViewGroup layout;
 	private final TextAvatarView avatar;
 	private final TextView name;
@@ -40,7 +41,7 @@ class GroupViewHolder extends RecyclerView.ViewHolder {
 
 	GroupViewHolder(View v) {
 		super(v);
-
+		ctx = v.getContext();
 		layout = (ViewGroup) v;
 		avatar = v.findViewById(R.id.avatarView);
 		name = v.findViewById(R.id.nameView);
@@ -51,8 +52,7 @@ class GroupViewHolder extends RecyclerView.ViewHolder {
 		remove = v.findViewById(R.id.removeButton);
 	}
 
-	void bindView(Context ctx, GroupItem group,
-			OnGroupRemoveClickListener listener) {
+	void bindView(GroupItem group, OnGroupRemoveClickListener listener) {
 		// Avatar
 		avatar.setText(group.getName().substring(0, 1));
 		avatar.setBackgroundBytes(group.getId().getBytes());

briar-android/src/main/java/org/briarproject/briar/android/privategroup/memberlist/GroupMemberListActivity.java

@@ -124,7 +124,7 @@ public class GroupMemberListActivity extends BriarActivity
 
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 	}

briar-android/src/main/java/org/briarproject/briar/android/privategroup/reveal/RevealContactsActivity.java

@@ -80,7 +80,7 @@ public class RevealContactsActivity extends ContactSelectorActivity
 
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 	}
@@ -120,7 +120,7 @@ public class RevealContactsActivity extends ContactSelectorActivity
 				new UiExceptionHandler<DbException>(this) {
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 	}
@@ -137,7 +137,7 @@ public class RevealContactsActivity extends ContactSelectorActivity
 				new UiExceptionHandler<DbException>(this) {
 					@Override
 					public void onExceptionUi(DbException exception) {
-						handleDbException(exception);
+						handleException(exception);
 					}
 				});
 		supportFinishAfterTransition();

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

@@ -0,0 +1,31 @@
+package org.briarproject.briar.android.reporting;
+
+import android.content.Context;
+import android.os.Process;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import java.lang.Thread.UncaughtExceptionHandler;
+
+import static org.briarproject.briar.android.util.UiUtils.startDevReportActivity;
+
+@NotNullByDefault
+public class BriarExceptionHandler implements UncaughtExceptionHandler {
+
+	private final Context ctx;
+	private final long appStartTime;
+
+	public BriarExceptionHandler(Context ctx) {
+		this.ctx = ctx;
+		this.appStartTime = System.currentTimeMillis();
+	}
+
+	@Override
+	public void uncaughtException(Thread t, Throwable e) {
+		// activity runs in its own process, so we can kill the old one
+		startDevReportActivity(ctx, CrashReportActivity.class, e, appStartTime);
+		Process.killProcess(Process.myPid());
+		System.exit(10);
+	}
+
+}

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

@@ -0,0 +1,343 @@
+/*
+  Some of the code in this file was copied from or inspired by ACRA
+  which is licenced under Apache 2.0 and authored by F43nd1r.
+  https://github.com/ACRA/acra/blob/3b9034/acra-core/src/main/java/org/acra/collector/
+ */
+
+package org.briarproject.briar.android.reporting;
+
+import android.annotation.SuppressLint;
+import android.app.ActivityManager;
+import android.bluetooth.BluetoothAdapter;
+import android.content.Context;
+import android.content.pm.FeatureInfo;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.PackageManager.NameNotFoundException;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
+import android.net.wifi.WifiInfo;
+import android.net.wifi.WifiManager;
+import android.os.Build;
+import android.os.Environment;
+
+import org.briarproject.bramble.api.Pair;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.briar.BuildConfig;
+import org.briarproject.briar.R;
+import org.briarproject.briar.android.BriarApplication;
+import org.briarproject.briar.android.logging.BriefLogFormatter;
+import org.briarproject.briar.android.reporting.ReportData.MultiReportInfo;
+import org.briarproject.briar.android.reporting.ReportData.ReportItem;
+import org.briarproject.briar.android.reporting.ReportData.SingleReportInfo;
+
+import java.io.File;
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.io.Writer;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.logging.Formatter;
+import java.util.logging.LogRecord;
+
+import javax.annotation.concurrent.Immutable;
+
+import androidx.annotation.Nullable;
+
+import static android.bluetooth.BluetoothAdapter.SCAN_MODE_CONNECTABLE;
+import static android.bluetooth.BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE;
+import static android.content.Context.WIFI_P2P_SERVICE;
+import static android.net.ConnectivityManager.TYPE_MOBILE;
+import static android.net.ConnectivityManager.TYPE_WIFI;
+import static android.net.wifi.WifiManager.WIFI_STATE_ENABLED;
+import static android.os.Build.VERSION.SDK_INT;
+import static androidx.core.content.ContextCompat.getSystemService;
+import static java.util.Locale.US;
+import static java.util.Objects.requireNonNull;
+import static java.util.TimeZone.getTimeZone;
+import static org.briarproject.bramble.util.AndroidUtils.getBluetoothAddressAndMethod;
+import static org.briarproject.bramble.util.PrivacyUtils.scrubInetAddress;
+import static org.briarproject.bramble.util.PrivacyUtils.scrubMacAddress;
+import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
+
+@Immutable
+@NotNullByDefault
+class BriarReportCollector {
+
+	private final Context ctx;
+
+	BriarReportCollector(Context ctx) {
+		this.ctx = ctx;
+	}
+
+	public ReportData collectReportData(@Nullable Throwable t,
+			long appStartTime) {
+		ReportData reportData = new ReportData()
+				.add(getBasicInfo(t))
+				.add(getDeviceInfo());
+		if (t != null) reportData.add(getStacktrace(t));
+		return reportData
+				.add(getTimeInfo(appStartTime))
+				.add(getMemory())
+				.add(getStorage())
+				.add(getConnectivity())
+				.add(getBuildConfig())
+				.add(getLogcat())
+				.add(getDeviceFeatures());
+	}
+
+	private ReportItem getBasicInfo(@Nullable Throwable t) {
+		String packageName = ctx.getPackageName();
+		PackageManager pm = ctx.getPackageManager();
+		String versionName;
+		int versionCode;
+		try {
+			PackageInfo packageInfo = pm.getPackageInfo(packageName, 0);
+			versionName = packageInfo.versionName;
+			versionCode = packageInfo.versionCode;
+		} catch (NameNotFoundException e) {
+			versionName = e.toString();
+			versionCode = 0;
+		}
+		MultiReportInfo basicInfo = new MultiReportInfo()
+				.add("PackageName", packageName)
+				.add("VersionName", versionName)
+				.add("VersionCode", versionCode)
+				.add("IsCrashReport", t != null);
+		return new ReportItem("BasicInfo", R.string.dev_report_basic_info,
+				basicInfo, false);
+	}
+
+	private ReportItem getDeviceInfo() {
+		MultiReportInfo deviceInfo = new MultiReportInfo()
+				.add("AndroidVersion", Build.VERSION.RELEASE)
+				.add("AndroidApi", SDK_INT)
+				.add("Product", Build.PRODUCT)
+				.add("Model", Build.MODEL)
+				.add("Brand", Build.BRAND);
+		return new ReportItem("DeviceInfo", R.string.dev_report_device_info,
+				deviceInfo);
+	}
+
+	private ReportItem getStacktrace(Throwable t) {
+		final Writer sw = new StringWriter();
+		final PrintWriter printWriter = new PrintWriter(sw);
+		if (!isNullOrEmpty(t.getMessage())) {
+			printWriter.println(t.getMessage());
+		}
+		t.printStackTrace(printWriter);
+		SingleReportInfo stacktrace = new SingleReportInfo(sw.toString());
+		return new ReportItem("Stacktrace", R.string.dev_report_stacktrace,
+				stacktrace);
+	}
+
+	private ReportItem getTimeInfo(long startTime) {
+		MultiReportInfo timeInfo = new MultiReportInfo()
+				.add("ReportTime", formatTime(System.currentTimeMillis()));
+		if (startTime > -1) {
+			timeInfo.add("AppStartTime", formatTime(startTime));
+		}
+		return new ReportItem("TimeInfo", R.string.dev_report_time_info,
+				timeInfo);
+	}
+
+	private String formatTime(long time) {
+		SimpleDateFormat format =
+				new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS", US);
+		format.setTimeZone(getTimeZone("UTC"));
+		return format.format(new Date(time));
+	}
+
+	private ReportItem getMemory() {
+		MultiReportInfo memInfo = new MultiReportInfo();
+
+		// System memory
+		ActivityManager am = getSystemService(ctx, ActivityManager.class);
+		ActivityManager.MemoryInfo mem = new ActivityManager.MemoryInfo();
+		requireNonNull(am).getMemoryInfo(mem);
+		memInfo.add("SystemMemoryTotal", mem.totalMem);
+		memInfo.add("SystemMemoryFree", mem.availMem);
+		memInfo.add("SystemMemoryThreshold", mem.threshold);
+
+		// Virtual machine memory
+		Runtime runtime = Runtime.getRuntime();
+		memInfo.add("VirtualMachineMemoryAllocated", runtime.totalMemory());
+		memInfo.add("VirtualMachineMemoryFree", runtime.freeMemory());
+		memInfo.add("VirtualMachineMemoryMaximum", runtime.maxMemory());
+
+		return new ReportItem("Memory", R.string.dev_report_memory, memInfo);
+	}
+
+	private ReportItem getStorage() {
+		MultiReportInfo storageInfo = new MultiReportInfo();
+
+		// Internal storage
+		File root = Environment.getRootDirectory();
+		storageInfo.add("InternalStorageTotal", root.getTotalSpace());
+		storageInfo.add("InternalStorageFree", root.getFreeSpace());
+
+		// External storage (SD card)
+		File sd = Environment.getExternalStorageDirectory();
+		storageInfo.add("ExternalStorageTotal", sd.getTotalSpace());
+		storageInfo.add("ExternalStorageFree", sd.getFreeSpace());
+
+		return new ReportItem("Storage", R.string.dev_report_storage,
+				storageInfo);
+	}
+
+	private ReportItem getConnectivity() {
+		MultiReportInfo connectivityInfo = new MultiReportInfo();
+
+		// Is mobile data available?
+		ConnectivityManager cm = requireNonNull(
+				getSystemService(ctx, ConnectivityManager.class));
+		NetworkInfo mobile = cm.getNetworkInfo(TYPE_MOBILE);
+		boolean mobileAvailable = mobile != null && mobile.isAvailable();
+		connectivityInfo.add("MobileDataAvailable", mobileAvailable);
+
+		// Is mobile data enabled?
+		boolean mobileEnabled = false;
+		try {
+			Class<?> clazz = Class.forName(cm.getClass().getName());
+			Method method = clazz.getDeclaredMethod("getMobileDataEnabled");
+			method.setAccessible(true);
+			mobileEnabled = (Boolean) requireNonNull(method.invoke(cm));
+		} catch (ClassNotFoundException
+				| NoSuchMethodException
+				| IllegalArgumentException
+				| InvocationTargetException
+				| IllegalAccessException e) {
+			connectivityInfo
+					.add("MobileDataReflectionException", e.toString());
+		}
+		connectivityInfo.add("MobileDataEnabled", mobileEnabled);
+
+		// Is mobile data connected ?
+		boolean mobileConnected = mobile != null && mobile.isConnected();
+		connectivityInfo.add("MobileDataConnected", mobileConnected);
+
+		// Is wifi available?
+		NetworkInfo wifi = cm.getNetworkInfo(TYPE_WIFI);
+		boolean wifiAvailable = wifi != null && wifi.isAvailable();
+		connectivityInfo.add("WifiAvailable", wifiAvailable);
+
+		// Is wifi enabled?
+		WifiManager wm = getSystemService(ctx, WifiManager.class);
+		boolean wifiEnabled = wm != null &&
+				wm.getWifiState() == WIFI_STATE_ENABLED;
+		connectivityInfo.add("WifiEnabled", wifiEnabled);
+
+		// Is wifi connected?
+		boolean wifiConnected = wifi != null && wifi.isConnected();
+		connectivityInfo.add("WifiConnected", wifiConnected);
+
+		// Is wifi direct supported?
+		boolean wifiDirect = ctx.getSystemService(WIFI_P2P_SERVICE) != null;
+		connectivityInfo.add("WiFiDirectSupported", wifiDirect);
+
+		if (wm != null) {
+			WifiInfo wifiInfo = wm.getConnectionInfo();
+			if (wifiInfo != null) {
+				int ip = wifiInfo.getIpAddress(); // Nice API, Google
+				byte[] ipBytes = new byte[4];
+				ipBytes[0] = (byte) (ip & 0xFF);
+				ipBytes[1] = (byte) ((ip >> 8) & 0xFF);
+				ipBytes[2] = (byte) ((ip >> 16) & 0xFF);
+				ipBytes[3] = (byte) ((ip >> 24) & 0xFF);
+				try {
+					InetAddress address = InetAddress.getByAddress(ipBytes);
+					connectivityInfo.add("WiFiAddress",
+							scrubInetAddress(address));
+				} catch (UnknownHostException ignored) {
+					// Should only be thrown if address has illegal length
+				}
+			}
+		}
+
+		// Is Bluetooth available?
+		BluetoothAdapter bt = BluetoothAdapter.getDefaultAdapter();
+		if (bt == null) {
+			connectivityInfo.add("BluetoothAvailable", false);
+		} else {
+			connectivityInfo.add("BluetoothAvailable", true);
+
+			// Is Bluetooth enabled?
+			@SuppressLint("HardwareIds")
+			boolean btEnabled = bt.isEnabled()
+					&& !isNullOrEmpty(bt.getAddress());
+			connectivityInfo.add("BluetoothEnabled", btEnabled);
+
+			// Is Bluetooth connectable?
+			int scanMode = bt.getScanMode();
+			boolean btConnectable = scanMode == SCAN_MODE_CONNECTABLE ||
+					scanMode == SCAN_MODE_CONNECTABLE_DISCOVERABLE;
+			connectivityInfo.add("BluetoothConnectable", btConnectable);
+
+			// Is Bluetooth discoverable?
+			boolean btDiscoverable =
+					scanMode == SCAN_MODE_CONNECTABLE_DISCOVERABLE;
+			connectivityInfo.add("BluetoothDiscoverable", btDiscoverable);
+
+			if (SDK_INT >= 21) {
+				// Is Bluetooth LE scanning and advertising supported?
+				boolean btLeScan = bt.getBluetoothLeScanner() != null;
+				connectivityInfo.add("BluetoothLeScanningSupported", btLeScan);
+				boolean btLeAdvertise =
+						bt.getBluetoothLeAdvertiser() != null;
+				connectivityInfo.add("BluetoothLeAdvertisingSupported",
+						btLeAdvertise);
+			}
+
+			Pair<String, String> p = getBluetoothAddressAndMethod(ctx, bt);
+			String address = p.getFirst();
+			String method = p.getSecond();
+			connectivityInfo.add("BluetoothAddress", scrubMacAddress(address));
+			connectivityInfo.add("BluetoothAddressMethod", method);
+		}
+		return new ReportItem("Connectivity", R.string.dev_report_connectivity,
+				connectivityInfo);
+	}
+
+	private ReportItem getBuildConfig() {
+		MultiReportInfo buildConfig = new MultiReportInfo()
+				.add("GitHash", BuildConfig.GitHash)
+				.add("BuildType", BuildConfig.BUILD_TYPE)
+				.add("Flavor", BuildConfig.FLAVOR)
+				.add("Debug", BuildConfig.DEBUG)
+				.add("BuildTimestamp", formatTime(BuildConfig.BuildTimestamp));
+		return new ReportItem("BuildConfig", R.string.dev_report_build_config,
+				buildConfig);
+	}
+
+	private ReportItem getLogcat() {
+		BriarApplication app = (BriarApplication) ctx.getApplicationContext();
+		StringBuilder sb = new StringBuilder();
+		Formatter formatter = new BriefLogFormatter();
+		for (LogRecord record : app.getRecentLogRecords()) {
+			sb.append(formatter.format(record)).append('\n');
+		}
+		return new ReportItem("Logcat", R.string.dev_report_logcat,
+				sb.toString());
+	}
+
+	private ReportItem getDeviceFeatures() {
+		PackageManager pm = ctx.getPackageManager();
+		FeatureInfo[] features = pm.getSystemAvailableFeatures();
+		MultiReportInfo deviceFeatures = new MultiReportInfo();
+		for (FeatureInfo feature : features) {
+			String featureName = feature.name;
+			if (featureName != null) {
+				deviceFeatures.add(featureName, true);
+			} else {
+				deviceFeatures.add("glEsVersion", feature.getGlEsVersion());
+			}
+		}
+		return new ReportItem("DeviceFeatures",
+				R.string.dev_report_device_features, deviceFeatures);
+	}
+
+}

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

@@ -1,277 +0,0 @@
-package org.briarproject.briar.android.reporting;
-
-import android.app.ActivityManager;
-import android.bluetooth.BluetoothAdapter;
-import android.content.Context;
-import android.net.ConnectivityManager;
-import android.net.NetworkInfo;
-import android.net.wifi.WifiInfo;
-import android.net.wifi.WifiManager;
-import android.os.Environment;
-import android.os.Handler;
-import android.os.Looper;
-
-import org.acra.builder.ReportBuilder;
-import org.acra.builder.ReportPrimer;
-import org.briarproject.bramble.api.Pair;
-import org.briarproject.briar.BuildConfig;
-import org.briarproject.briar.android.BriarApplication;
-import org.briarproject.briar.android.logging.BriefLogFormatter;
-
-import java.io.File;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-import java.net.InetAddress;
-import java.net.UnknownHostException;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.concurrent.Callable;
-import java.util.concurrent.ExecutionException;
-import java.util.concurrent.FutureTask;
-import java.util.logging.Formatter;
-import java.util.logging.LogRecord;
-
-import androidx.annotation.NonNull;
-
-import static android.bluetooth.BluetoothAdapter.SCAN_MODE_CONNECTABLE;
-import static android.bluetooth.BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE;
-import static android.content.Context.ACTIVITY_SERVICE;
-import static android.content.Context.CONNECTIVITY_SERVICE;
-import static android.content.Context.WIFI_P2P_SERVICE;
-import static android.content.Context.WIFI_SERVICE;
-import static android.net.ConnectivityManager.TYPE_MOBILE;
-import static android.net.ConnectivityManager.TYPE_WIFI;
-import static android.net.wifi.WifiManager.WIFI_STATE_ENABLED;
-import static android.os.Build.VERSION.SDK_INT;
-import static java.util.Collections.unmodifiableMap;
-import static org.briarproject.bramble.util.AndroidUtils.getBluetoothAddressAndMethod;
-import static org.briarproject.bramble.util.PrivacyUtils.scrubInetAddress;
-import static org.briarproject.bramble.util.PrivacyUtils.scrubMacAddress;
-import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
-
-public class BriarReportPrimer implements ReportPrimer {
-
-	@Override
-	public void primeReport(@NonNull Context ctx,
-			@NonNull ReportBuilder builder) {
-		CustomDataTask task = new CustomDataTask(ctx);
-		FutureTask<Map<String, String>> futureTask = new FutureTask<>(task);
-		// Use a new thread as the Android executor thread may have died
-		new SingleShotAndroidExecutor(futureTask).start();
-		try {
-			builder.customData(futureTask.get());
-		} catch (InterruptedException | ExecutionException e) {
-			builder.customData("Custom data exception", e.toString());
-		}
-	}
-
-	private static class CustomDataTask
-			implements Callable<Map<String, String>> {
-
-		private final Context ctx;
-
-		private CustomDataTask(Context ctx) {
-			this.ctx = ctx;
-		}
-
-		@Override
-		public Map<String, String> call() {
-			Map<String, String> customData = new LinkedHashMap<>();
-
-			// Log
-			BriarApplication app =
-					(BriarApplication) ctx.getApplicationContext();
-			StringBuilder sb = new StringBuilder();
-			Formatter formatter = new BriefLogFormatter();
-			for (LogRecord record : app.getRecentLogRecords()) {
-				sb.append(formatter.format(record)).append('\n');
-			}
-			customData.put("Log", sb.toString());
-
-			// System memory
-			Object o = ctx.getSystemService(ACTIVITY_SERVICE);
-			ActivityManager am = (ActivityManager) o;
-			ActivityManager.MemoryInfo mem = new ActivityManager.MemoryInfo();
-			am.getMemoryInfo(mem);
-			String systemMemory;
-			systemMemory = (mem.totalMem / 1024 / 1024) + " MiB total, "
-					+ (mem.availMem / 1024 / 1204) + " MiB free, "
-					+ (mem.threshold / 1024 / 1024) + " MiB threshold";
-			customData.put("System memory", systemMemory);
-
-			// Virtual machine memory
-			Runtime runtime = Runtime.getRuntime();
-			long heap = runtime.totalMemory();
-			long heapFree = runtime.freeMemory();
-			long heapMax = runtime.maxMemory();
-			String vmMemory = (heap / 1024 / 1024) + " MiB allocated, "
-					+ (heapFree / 1024 / 1024) + " MiB free, "
-					+ (heapMax / 1024 / 1024) + " MiB maximum";
-			customData.put("Virtual machine memory", vmMemory);
-
-			// Internal storage
-			File root = Environment.getRootDirectory();
-			long rootTotal = root.getTotalSpace();
-			long rootFree = root.getFreeSpace();
-			String internal = (rootTotal / 1024 / 1024) + " MiB total, "
-					+ (rootFree / 1024 / 1024) + " MiB free";
-			customData.put("Internal storage", internal);
-
-			// External storage (SD card)
-			File sd = Environment.getExternalStorageDirectory();
-			long sdTotal = sd.getTotalSpace();
-			long sdFree = sd.getFreeSpace();
-			String external = (sdTotal / 1024 / 1024) + " MiB total, "
-					+ (sdFree / 1024 / 1024) + " MiB free";
-			customData.put("External storage", external);
-
-			// Is mobile data available?
-			o = ctx.getSystemService(CONNECTIVITY_SERVICE);
-			ConnectivityManager cm = (ConnectivityManager) o;
-			NetworkInfo mobile = cm.getNetworkInfo(TYPE_MOBILE);
-			boolean mobileAvailable = mobile != null && mobile.isAvailable();
-			// Is mobile data enabled?
-			boolean mobileEnabled = false;
-			try {
-				Class<?> clazz = Class.forName(cm.getClass().getName());
-				Method method = clazz.getDeclaredMethod("getMobileDataEnabled");
-				method.setAccessible(true);
-				mobileEnabled = (Boolean) method.invoke(cm);
-			} catch (ClassNotFoundException
-					| NoSuchMethodException
-					| IllegalArgumentException
-					| InvocationTargetException
-					| IllegalAccessException e) {
-				customData.put("Mobile data reflection exception",
-						e.toString());
-			}
-			// Is mobile data connected ?
-			boolean mobileConnected = mobile != null && mobile.isConnected();
-
-			String mobileStatus;
-			if (mobileAvailable) mobileStatus = "Available, ";
-			else mobileStatus = "Not available, ";
-			if (mobileEnabled) mobileStatus += "enabled, ";
-			else mobileStatus += "not enabled, ";
-			if (mobileConnected) mobileStatus += "connected";
-			else mobileStatus += "not connected";
-			customData.put("Mobile data status", mobileStatus);
-
-			// Is wifi available?
-			NetworkInfo wifi = cm.getNetworkInfo(TYPE_WIFI);
-			boolean wifiAvailable = wifi != null && wifi.isAvailable();
-			// Is wifi enabled?
-			o = ctx.getApplicationContext().getSystemService(WIFI_SERVICE);
-			WifiManager wm = (WifiManager) o;
-			boolean wifiEnabled = wm != null &&
-					wm.getWifiState() == WIFI_STATE_ENABLED;
-			// Is wifi connected?
-			boolean wifiConnected = wifi != null && wifi.isConnected();
-
-			String wifiStatus;
-			if (wifiAvailable) wifiStatus = "Available, ";
-			else wifiStatus = "Not available, ";
-			if (wifiEnabled) wifiStatus += "enabled, ";
-			else wifiStatus += "not enabled, ";
-			if (wifiConnected) wifiStatus += "connected";
-			else wifiStatus += "not connected";
-			customData.put("Wi-Fi status", wifiStatus);
-
-			// Is wifi direct supported?
-			String wifiDirectStatus = "Supported";
-			if (ctx.getSystemService(WIFI_P2P_SERVICE) == null)
-				wifiDirectStatus = "Not supported";
-			customData.put("Wi-Fi Direct", wifiDirectStatus);
-
-			if (wm != null) {
-				WifiInfo wifiInfo = wm.getConnectionInfo();
-				if (wifiInfo != null) {
-					int ip = wifiInfo.getIpAddress(); // Nice API, Google
-					byte[] ipBytes = new byte[4];
-					ipBytes[0] = (byte) (ip & 0xFF);
-					ipBytes[1] = (byte) ((ip >> 8) & 0xFF);
-					ipBytes[2] = (byte) ((ip >> 16) & 0xFF);
-					ipBytes[3] = (byte) ((ip >> 24) & 0xFF);
-					try {
-						InetAddress address = InetAddress.getByAddress(ipBytes);
-						customData.put("Wi-Fi address",
-								scrubInetAddress(address));
-					} catch (UnknownHostException ignored) {
-						// Should only be thrown if address has illegal length
-					}
-				}
-			}
-
-			// Is Bluetooth available?
-			BluetoothAdapter bt = BluetoothAdapter.getDefaultAdapter();
-			if (bt == null) {
-				customData.put("Bluetooth status", "Not available");
-			} else {
-				// Is Bluetooth enabled?
-				boolean btEnabled = bt.isEnabled()
-						&& !isNullOrEmpty(bt.getAddress());
-				// Is Bluetooth connectable?
-				int scanMode = bt.getScanMode();
-				boolean btConnectable = scanMode == SCAN_MODE_CONNECTABLE ||
-						scanMode == SCAN_MODE_CONNECTABLE_DISCOVERABLE;
-				// Is Bluetooth discoverable?
-				boolean btDiscoverable =
-						scanMode == SCAN_MODE_CONNECTABLE_DISCOVERABLE;
-
-				String btStatus;
-				if (btEnabled) btStatus = "Available, enabled, ";
-				else btStatus = "Available, not enabled, ";
-				if (btConnectable) btStatus += "connectable, ";
-				else btStatus += "not connectable, ";
-				if (btDiscoverable) btStatus += "discoverable";
-				else btStatus += "not discoverable";
-				customData.put("Bluetooth status", btStatus);
-
-				if (SDK_INT >= 21) {
-					// Is Bluetooth LE scanning and advertising supported?
-					boolean btLeScan = bt.getBluetoothLeScanner() != null;
-					boolean btLeAdvertise =
-							bt.getBluetoothLeAdvertiser() != null;
-					String btLeStatus;
-					if (btLeScan) btLeStatus = "Scanning, ";
-					else btLeStatus = "No scanning, ";
-					if (btLeAdvertise) btLeStatus += "advertising";
-					else btLeStatus += "no advertising";
-					customData.put("Bluetooth LE status", btLeStatus);
-				}
-
-				Pair<String, String> p = getBluetoothAddressAndMethod(ctx, bt);
-				String address = p.getFirst();
-				String method = p.getSecond();
-				customData.put("Bluetooth address", scrubMacAddress(address));
-				customData.put("Bluetooth address method", method);
-			}
-
-			// Git commit ID
-			customData.put("Commit ID", BuildConfig.GitHash);
-
-			return unmodifiableMap(customData);
-		}
-	}
-
-	private static class SingleShotAndroidExecutor extends Thread {
-
-		private final Runnable runnable;
-
-		private SingleShotAndroidExecutor(Runnable runnable) {
-			this.runnable = runnable;
-		}
-
-		@Override
-		public void run() {
-			Looper.prepare();
-			Handler handler = new Handler();
-			handler.post(runnable);
-			handler.post(() -> {
-				Looper looper = Looper.myLooper();
-				if (looper != null) looper.quit();
-			});
-			Looper.loop();
-		}
-	}
-}

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

@@ -1,46 +0,0 @@
-package org.briarproject.briar.android.reporting;
-
-import android.content.Context;
-
-import org.acra.collector.CrashReportData;
-import org.acra.sender.ReportSender;
-import org.acra.sender.ReportSenderException;
-import org.briarproject.bramble.api.reporting.DevReporter;
-import org.briarproject.bramble.util.AndroidUtils;
-import org.briarproject.briar.android.AndroidComponent;
-
-import java.io.File;
-import java.io.FileNotFoundException;
-
-import javax.inject.Inject;
-
-import androidx.annotation.NonNull;
-
-import static org.acra.ReportField.REPORT_ID;
-
-public class BriarReportSender implements ReportSender {
-
-	private final AndroidComponent component;
-
-	@Inject
-	DevReporter reporter;
-
-	BriarReportSender(AndroidComponent component) {
-		this.component = component;
-	}
-
-	@Override
-	public void send(@NonNull Context ctx,
-			@NonNull CrashReportData errorContent)
-			throws ReportSenderException {
-		component.inject(this);
-		String crashReport = errorContent.toJSON().toString();
-		try {
-			File reportDir = AndroidUtils.getReportDir(ctx);
-			String reportId = errorContent.getProperty(REPORT_ID);
-			reporter.encryptReportToFile(reportDir, reportId, crashReport);
-		} catch (FileNotFoundException e) {
-			throw new ReportSenderException("Failed to encrypt report", e);
-		}
-	}
-}

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

@@ -1,22 +0,0 @@
-package org.briarproject.briar.android.reporting;
-
-import android.content.Context;
-
-import org.acra.config.ACRAConfiguration;
-import org.acra.sender.ReportSender;
-import org.acra.sender.ReportSenderFactory;
-import org.briarproject.briar.android.BriarApplication;
-
-import androidx.annotation.NonNull;
-
-public class BriarReportSenderFactory implements ReportSenderFactory {
-
-	@NonNull
-	@Override
-	public ReportSender create(@NonNull Context ctx,
-			@NonNull ACRAConfiguration config) {
-		// ACRA passes in the Application as context
-		BriarApplication app = (BriarApplication) ctx;
-		return new BriarReportSender(app.getApplicationComponent());
-	}
-}

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

@@ -8,15 +8,36 @@ import android.view.ViewGroup;
 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.fragment.BaseFragment;
+
+import javax.inject.Inject;
 
 import androidx.annotation.Nullable;
-import androidx.fragment.app.Fragment;
-
-import static java.util.Objects.requireNonNull;
+import androidx.lifecycle.ViewModelProvider;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
-public class CrashFragment extends Fragment {
+public class CrashFragment extends BaseFragment {
+
+	public final static String TAG = CrashFragment.class.getName();
+
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+
+	@Override
+	public void injectFragment(ActivityComponent component) {
+		component.inject(this);
+	}
+
+	private ReportViewModel viewModel;
+
+	@Override
+	public void onCreate(@Nullable Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+		viewModel = new ViewModelProvider(requireActivity(), viewModelFactory)
+				.get(ReportViewModel.class);
+	}
 
 	@Nullable
 	@Override
@@ -27,15 +48,16 @@ public class CrashFragment extends Fragment {
 				.inflate(R.layout.fragment_crash, container, false);
 
 		v.findViewById(R.id.acceptButton).setOnClickListener(view ->
-				getDevReportActivity().displayFragment(true));
+				viewModel.showReport());
 		v.findViewById(R.id.declineButton).setOnClickListener(view ->
-				getDevReportActivity().closeReport());
+				viewModel.closeReport());
 
 		return v;
 	}
 
-	private DevReportActivity getDevReportActivity() {
-		return (DevReportActivity) requireNonNull(getActivity());
+	@Override
+	public String getUniqueTag() {
+		return TAG;
 	}
 
 }

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

@@ -0,0 +1,117 @@
+package org.briarproject.briar.android.reporting;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.Looper;
+import android.os.Process;
+import android.widget.Toast;
+
+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.BaseActivity;
+import org.briarproject.briar.android.fragment.BaseFragment;
+import org.briarproject.briar.android.fragment.BaseFragment.BaseFragmentListener;
+import org.briarproject.briar.android.logout.HideUiActivity;
+
+import javax.inject.Inject;
+
+import androidx.annotation.Nullable;
+import androidx.appcompat.widget.Toolbar;
+import androidx.lifecycle.ViewModelProvider;
+
+import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TASK;
+import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
+import static android.content.Intent.FLAG_ACTIVITY_NO_ANIMATION;
+import static android.widget.Toast.LENGTH_LONG;
+import static java.util.Objects.requireNonNull;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+public class CrashReportActivity extends BaseActivity
+		implements BaseFragmentListener {
+
+	public static final String EXTRA_THROWABLE = "throwable";
+	public static final String EXTRA_APP_START_TIME = "appStartTime";
+
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+
+	private ReportViewModel viewModel;
+
+	@Override
+	public void injectActivity(ActivityComponent component) {
+		component.inject(this);
+	}
+
+	@Override
+	public void onCreate(@Nullable Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+		setContentView(R.layout.activity_dev_report);
+
+		viewModel = new ViewModelProvider(this, viewModelFactory)
+				.get(ReportViewModel.class);
+		Intent intent = getIntent();
+		Throwable t = (Throwable) intent.getSerializableExtra(EXTRA_THROWABLE);
+		long appStartTime = intent.getLongExtra(EXTRA_APP_START_TIME, -1);
+		viewModel.init(t, appStartTime);
+		viewModel.getShowReport().observeEvent(this, show -> {
+			if (show) displayFragment(true);
+		});
+		viewModel.getCloseReport().observeEvent(this, res -> {
+			if (res != 0) {
+				Toast.makeText(this, res, LENGTH_LONG).show();
+			}
+			exit();
+		});
+
+		Toolbar toolbar = findViewById(R.id.toolbar);
+		setSupportActionBar(toolbar);
+
+		if (savedInstanceState == null) displayFragment(viewModel.isFeedback());
+	}
+
+	@Override
+	public void runOnDbThread(Runnable runnable) {
+		throw new AssertionError("deprecated!!!");
+	}
+
+	@Override
+	public void onBackPressed() {
+		exit();
+	}
+
+	void displayFragment(boolean showReportForm) {
+		BaseFragment f;
+		if (showReportForm) {
+			f = new ReportFormFragment();
+			requireNonNull(getSupportActionBar()).show();
+		} else {
+			f = new CrashFragment();
+			requireNonNull(getSupportActionBar()).hide();
+		}
+		getSupportFragmentManager().beginTransaction()
+				.replace(R.id.fragmentContainer, f, f.getUniqueTag())
+				.commit();
+	}
+
+	void exit() {
+		if (!viewModel.isFeedback()) {
+			Intent i = new Intent(this, HideUiActivity.class);
+			i.addFlags(FLAG_ACTIVITY_NEW_TASK
+					| FLAG_ACTIVITY_NO_ANIMATION
+					| FLAG_ACTIVITY_CLEAR_TASK);
+			startActivity(i);
+			// crash reports run in their own process that we should kill now
+			// otherwise it keeps running and e.g. doesn't pick up theme changes
+			new Handler(Looper.getMainLooper()).postDelayed(() -> {
+				Process.killProcess(Process.myPid());
+				// kill the process with some delay to keep the Toast visible
+			}, 5000);
+		}
+		finish();
+	}
+
+}

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

@@ -1,188 +0,0 @@
-package org.briarproject.briar.android.reporting;
-
-import android.content.Context;
-import android.content.Intent;
-import android.content.res.Configuration;
-import android.os.Bundle;
-
-import org.acra.dialog.BaseCrashReportDialog;
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
-import org.briarproject.briar.R;
-import org.briarproject.briar.android.Localizer;
-import org.briarproject.briar.android.logout.HideUiActivity;
-import org.briarproject.briar.android.util.UserFeedback;
-
-import java.io.File;
-
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.appcompat.app.AppCompatDelegate;
-import androidx.appcompat.widget.Toolbar;
-import androidx.fragment.app.Fragment;
-
-import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TASK;
-import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
-import static android.content.Intent.FLAG_ACTIVITY_NO_ANIMATION;
-import static android.os.Build.VERSION.SDK_INT;
-import static android.view.WindowManager.LayoutParams.FLAG_SECURE;
-import static java.util.Objects.requireNonNull;
-import static org.acra.ACRAConstants.EXTRA_REPORT_FILE;
-import static org.briarproject.briar.android.TestingConstants.PREVENT_SCREENSHOTS;
-
-@MethodsNotNullByDefault
-@ParametersNotNullByDefault
-public class DevReportActivity extends BaseCrashReportDialog {
-
-	private AppCompatDelegate delegate;
-
-	private AppCompatDelegate getDelegate() {
-		if (delegate == null) {
-			delegate = AppCompatDelegate.create(this, null);
-		}
-		return delegate;
-	}
-
-	@Override
-	protected void preInit(@Nullable Bundle savedInstanceState) {
-		super.preInit(savedInstanceState);
-		getDelegate().installViewFactory();
-		getDelegate().onCreate(savedInstanceState);
-		getDelegate().applyDayNight();
-		// We always need to re-apply the theme
-		// for day/night the changes to take effect.
-		// On API 23+, we should bypass setTheme(), which will no-op
-		// if the theme ID is identical to the current theme ID.
-		int theme = R.style.BriarTheme_NoActionBar;
-		if (SDK_INT >= 23) {
-			onApplyThemeResource(getTheme(), theme, false);
-		} else {
-			setTheme(theme);
-		}
-	}
-
-	@Override
-	public void init(@Nullable Bundle state) {
-		super.init(state);
-
-		if (PREVENT_SCREENSHOTS) getWindow().addFlags(FLAG_SECURE);
-
-		getDelegate().setContentView(R.layout.activity_dev_report);
-
-		Toolbar toolbar = findViewById(R.id.toolbar);
-		getDelegate().setSupportActionBar(toolbar);
-
-		String title = getString(isFeedback() ? R.string.feedback_title :
-				R.string.crash_report_title);
-		requireNonNull(getDelegate().getSupportActionBar()).setTitle(title);
-
-		if (state == null) displayFragment(isFeedback());
-	}
-
-	@Override
-	protected void attachBaseContext(Context base) {
-		super.attachBaseContext(
-				Localizer.getInstance().setLocale(base));
-	}
-
-	@Override
-	public void onPostCreate(@Nullable Bundle state) {
-		super.onPostCreate(state);
-		getDelegate().onPostCreate(state);
-	}
-
-	@Override
-	protected void onStart() {
-		super.onStart();
-		getDelegate().onStart();
-	}
-
-	@Override
-	protected void onPostResume() {
-		super.onPostResume();
-		getDelegate().onPostResume();
-	}
-
-	@Override
-	public void onTitleChanged(CharSequence title, int color) {
-		super.onTitleChanged(title, color);
-		getDelegate().setTitle(title);
-	}
-
-	@Override
-	public void onConfigurationChanged(Configuration newConfig) {
-		super.onConfigurationChanged(newConfig);
-		getDelegate().onConfigurationChanged(newConfig);
-	}
-
-	@Override
-	protected void onSaveInstanceState(@NonNull Bundle outState) {
-		super.onSaveInstanceState(outState);
-		getDelegate().onSaveInstanceState(outState);
-	}
-
-	@Override
-	public void onStop() {
-		super.onStop();
-		getDelegate().onStop();
-	}
-
-	@Override
-	public void onDestroy() {
-		super.onDestroy();
-		getDelegate().onDestroy();
-	}
-
-	@Override
-	public void onBackPressed() {
-		closeReport();
-	}
-
-	void sendCrashReport(String comment, String email) {
-		sendCrash(comment, email);
-	}
-
-	private boolean isFeedback() {
-		return getException() instanceof UserFeedback;
-	}
-
-	void displayFragment(boolean showReportForm) {
-		Fragment f;
-		if (showReportForm) {
-			File file =
-					(File) getIntent().getSerializableExtra(EXTRA_REPORT_FILE);
-			f = ReportFormFragment.newInstance(isFeedback(), file);
-			requireNonNull(getDelegate().getSupportActionBar()).show();
-		} else {
-			f = new CrashFragment();
-			requireNonNull(getDelegate().getSupportActionBar()).hide();
-		}
-		getSupportFragmentManager().beginTransaction()
-				.replace(R.id.fragmentContainer, f, f.getTag())
-				.commit();
-
-	}
-
-	@Override
-	public void invalidateOptionsMenu() {
-		super.invalidateOptionsMenu();
-		getDelegate().invalidateOptionsMenu();
-	}
-
-	void closeReport() {
-		cancelReports();
-		exit();
-	}
-
-	void exit() {
-		if (!isFeedback()) {
-			Intent i = new Intent(this, HideUiActivity.class);
-			i.addFlags(FLAG_ACTIVITY_NEW_TASK
-					| FLAG_ACTIVITY_NO_ANIMATION
-					| FLAG_ACTIVITY_CLEAR_TASK);
-			startActivity(i);
-		}
-		finish();
-	}
-
-}

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

@@ -0,0 +1,18 @@
+package org.briarproject.briar.android.reporting;
+
+import org.briarproject.briar.android.viewmodel.ViewModelKey;
+
+import androidx.lifecycle.ViewModel;
+import dagger.Binds;
+import dagger.Module;
+import dagger.multibindings.IntoMap;
+
+@Module
+public abstract class DevReportModule {
+
+	@Binds
+	@IntoMap
+	@ViewModelKey(ReportViewModel.class)
+	abstract ViewModel bindReportViewModel(ReportViewModel reportViewModel);
+
+}