Bump version numbers for 1.0.11 release.

Fix a possible null reference bug

See merge request briar/briar!853

bramble-android/build.gradle

@@ -8,8 +8,8 @@ android {
 	defaultConfig {
 		minSdkVersion 14
 		targetSdkVersion 26
-		versionCode 10006
-		versionName "1.0.6"
+		versionCode 10011
+		versionName "1.0.11"
 		consumerProguardFiles 'proguard-rules.txt'
 	}
 
@@ -35,32 +35,32 @@ dependencies {
 
 dependencyVerification {
 	verify = [
-			'com.android.tools.analytics-library:protos:26.1.2:protos-26.1.2.jar:52672a0b42b572a06aecc3535d5068eb46c0e15d129b9f1085d3c16a1da5cdbb',
-			'com.android.tools.analytics-library:shared:26.1.2:shared-26.1.2.jar:5c7e0eda18c6f87feeb83628c707e8aaa3298b41fb72e38efe31ad1675f9e8e9',
-			'com.android.tools.analytics-library:tracker:26.1.2:tracker-26.1.2.jar:06f97aa0adf44ffb06f8681c6a79d9be153a08f61d21eddc42b8d3db96df4282',
-			'com.android.tools.build:apksig:3.1.2:apksig-3.1.2.jar:40696a4559124d1d57873d208857eee059d48859239d569c7d18374ac644a8be',
-			'com.android.tools.build:builder-model:3.1.2:builder-model-3.1.2.jar:d49bfa2a135c9562b6ca7aa4342036cfa1582c7074c2d1d93d1dae8b3a134e17',
-			'com.android.tools.build:builder-test-api:3.1.2:builder-test-api-3.1.2.jar:dfe2a50b740d41b11189101062434d4283d18647e89a492ad51710c719363e9f',
-			'com.android.tools.build:builder:3.1.2:builder-3.1.2.jar:b60f825a42e2efe8433619fbc759f3d9effecab718279048d36881188ceb1d14',
-			'com.android.tools.build:gradle-api:3.1.2:gradle-api-3.1.2.jar:e58bcc5b893e4583ab0f5c8ef89c4dbcce202b405a9d7fcc116d21e5357d4893',
-			'com.android.tools.build:manifest-merger:26.1.2:manifest-merger-26.1.2.jar:9c61c27ea5266573107b954acf1216d398f4d7e7ae6fad6409d6b2b767eb091c',
-			'com.android.tools.ddms:ddmlib:26.1.2:ddmlib-26.1.2.jar:18a2a5fbef36882f07d03c2b9e59eba05cf8248177bf5cbff736e4b582804c44',
-			'com.android.tools.external.com-intellij:intellij-core:26.1.2:intellij-core-26.1.2.jar:37c5acf279f1ae3e85b1a5be3c9f15f43bde7b08f978eefefffb9c4035760c52',
-			'com.android.tools.external.com-intellij:kotlin-compiler:26.1.2:kotlin-compiler-26.1.2.jar:152df0bee7580326c77316b669a9d96e3b09efb1d45f545dce4147271b0b8944',
-			'com.android.tools.external.org-jetbrains:uast:26.1.2:uast-26.1.2.jar:02d39582206d3f5fc0a6cb18bfd9e8b9f9c1acb805ec6dac08b4e3a56849d279',
-			'com.android.tools.layoutlib:layoutlib-api:26.1.2:layoutlib-api-26.1.2.jar:20220039fcc7d799f928153beff862e704457c0f55ab44258f3745ebeb662b4f',
-			'com.android.tools.lint:lint-api:26.1.2:lint-api-26.1.2.jar:e1d5b62b870a7c566e9877a6b96b27784a4d713f8caa07fdcb4705d47a40a1d9',
-			'com.android.tools.lint:lint-checks:26.1.2:lint-checks-26.1.2.jar:211e2afd58504372385d71b1e5be982c2b5121ab6fee1c04ddabeb75a8729e07',
-			'com.android.tools.lint:lint-gradle-api:26.1.2:lint-gradle-api-26.1.2.jar:71284f2a8b03c3e55c94511c9eb36f8184fbb85324325fc6b78abf5183f03d90',
-			'com.android.tools.lint:lint-gradle:26.1.2:lint-gradle-26.1.2.jar:855f0c82b7fc690df1b7319c0774f7517f7f8f5dd4eee1f6077dcf50e07c6240',
-			'com.android.tools.lint:lint-kotlin:26.1.2:lint-kotlin-26.1.2.jar:1e591f70bcbbc11569720a9bbcca2bc1f3d4f789f01f40f642848d920643d484',
-			'com.android.tools.lint:lint:26.1.2:lint-26.1.2.jar:93736c62e9f1976998c2b4aa716aea0734cdb162d05502f4af7292654aedb182',
-			'com.android.tools:annotations:26.1.2:annotations-26.1.2.jar:72773dcaf5c4ccca828e3c8467f1b78a8a00b3cc5f8ad1aab88fcf9379928018',
-			'com.android.tools:common:26.1.2:common-26.1.2.jar:ea4320f0c17dcbc4491896bb705c4d25ec08bd62ef02ab0579fe154e75e788e6',
-			'com.android.tools:dvlib:26.1.2:dvlib-26.1.2.jar:1187aa4fb666595c96c4deb6bc0e0f4b7e396bde9f6243330b49a232946130ea',
-			'com.android.tools:repository:26.1.2:repository-26.1.2.jar:8b86e512ad6d32bd76989451eefe2b271f5efce6d4d65ecb173afaf14606e01a',
-			'com.android.tools:sdk-common:26.1.2:sdk-common-26.1.2.jar:23584720a60a21cdcb5b1ec10269e3013789d6805d153cc696c39ec7ce251896',
-			'com.android.tools:sdklib:26.1.2:sdklib-26.1.2.jar:d3870fafc59ab8efa70d3f9649f40ee299c8ec5b58377b06e8853d7272a5bf4e',
+			'com.android.tools.analytics-library:protos:26.1.3:protos-26.1.3.jar:818c9f256f141d9dafec03a1aa2b94d240b2c140acfd7ee31a8b3e6c2b9479e3',
+			'com.android.tools.analytics-library:shared:26.1.3:shared-26.1.3.jar:7110706c7ada96c8b6f5ca80c478291bc7899d46277de2c48527e045442401a3',
+			'com.android.tools.analytics-library:tracker:26.1.3:tracker-26.1.3.jar:4155424bf2ce4872da83332579a1707252bc66cbd77c5144fdc4483d0f2e1418',
+			'com.android.tools.build:apksig:3.1.3:apksig-3.1.3.jar:7e1f8e675a6e768e5b56405e41d6c3cc05befe62e601b04177de1029902c9c89',
+			'com.android.tools.build:builder-model:3.1.3:builder-model-3.1.3.jar:06ad1c422d679fc698451479cb40ba863849d67bfd1de23f6d2c16d78b024b0b',
+			'com.android.tools.build:builder-test-api:3.1.3:builder-test-api-3.1.3.jar:4d989f780436794f0f8b2f50e9e079b786571eac90f26c208ab2ae6d4012f389',
+			'com.android.tools.build:builder:3.1.3:builder-3.1.3.jar:8a1092012c89d0ec1ee2eff09c5708c71ef4482a6862df8d3a44a67fccace01c',
+			'com.android.tools.build:gradle-api:3.1.3:gradle-api-3.1.3.jar:01e4df521456aef66514336f1d492346730dd1fb8f6433a89f62da834941ed72',
+			'com.android.tools.build:manifest-merger:26.1.3:manifest-merger-26.1.3.jar:1e4fc7e932adb4607082409800e5e6fccb42e6c5360ae5990094bf522f3ada55',
+			'com.android.tools.ddms:ddmlib:26.1.3:ddmlib-26.1.3.jar:c54931cd68df5d1ea2923b3b320eae47cd2307a5a916bb8674c0acf93cd1d3cd',
+			'com.android.tools.external.com-intellij:intellij-core:26.1.3:intellij-core-26.1.3.jar:af67f5535fef2e1a28b1007a4acb8c5deb6a1e33b8afe7b11d012c9e778ebcec',
+			'com.android.tools.external.com-intellij:kotlin-compiler:26.1.3:kotlin-compiler-26.1.3.jar:c746d2859dc11cc05c84b692b3498d3a621e0929511f8440ee009c6557838fd4',
+			'com.android.tools.external.org-jetbrains:uast:26.1.3:uast-26.1.3.jar:3f3f6651d0c7685a77ecb22e9c82d6b49fdf24322c17360768dc530678f43265',
+			'com.android.tools.layoutlib:layoutlib-api:26.1.3:layoutlib-api-26.1.3.jar:10bc73ce706c45629872d6a999dbe12116df64e24f47ff93b7b13121ff57b4b0',
+			'com.android.tools.lint:lint-api:26.1.3:lint-api-26.1.3.jar:6f97323f9af8deda86278717885b5c927f3766757db89709f52d11d42b6fb751',
+			'com.android.tools.lint:lint-checks:26.1.3:lint-checks-26.1.3.jar:73c3d53784c9ce3e6d5968506581918e0179645d20809927ca4a001dd766b001',
+			'com.android.tools.lint:lint-gradle-api:26.1.3:lint-gradle-api-26.1.3.jar:7ca3c4866ec21dc21d53a9d86f752b77ace6f6c610a0c9dc877313856c733d9d',
+			'com.android.tools.lint:lint-gradle:26.1.3:lint-gradle-26.1.3.jar:db0c354b8f4b6f6637e31f91c564785a59ff896325331fcbc3de7458e0b6c067',
+			'com.android.tools.lint:lint-kotlin:26.1.3:lint-kotlin-26.1.3.jar:94e2b0f4565a241561cfb8fc1222bb3f132a3b98d2a90421dbb72ee8358e7d68',
+			'com.android.tools.lint:lint:26.1.3:lint-26.1.3.jar:8d5f32c989c6d191d712e90ad3ca2d1c409313599551d04d834caa44d26c78df',
+			'com.android.tools:annotations:26.1.3:annotations-26.1.3.jar:c950430b24ac5d58fc97e7283b8f0115f99587e76e08b4e1e2aaa780f2d77323',
+			'com.android.tools:common:26.1.3:common-26.1.3.jar:7c31a90581a148ab219f615a59667f0dded7fa39b248529784474da3c2274ef2',
+			'com.android.tools:dvlib:26.1.3:dvlib-26.1.3.jar:0cae87906f53d3f1088366a916ed180a7312b6d9919b90797f238875c8492855',
+			'com.android.tools:repository:26.1.3:repository-26.1.3.jar:52d4539cc68db91b261e2a33b2c8206b26e05539078758dc28cfb3854adb4f59',
+			'com.android.tools:sdk-common:26.1.3:sdk-common-26.1.3.jar:1948603ca9ff22c7ebb3178000bffa3a9dd2ca1cc5cb0c793cae08468b8fcfc1',
+			'com.android.tools:sdklib:26.1.3:sdklib-26.1.3.jar:4adcfaad9514607098d2c51503c39811112d3050f4d1e744c01c7f08f591032b',
 			'com.google.code.findbugs:jsr305:1.3.9:jsr305-1.3.9.jar:905721a0eea90a81534abb7ee6ef4ea2e5e645fa1def0a5cd88402df1b46c9ed',
 			'com.google.code.gson:gson:2.7:gson-2.7.jar:2d43eb5ea9e133d2ee2405cc14f5ee08951b8361302fdd93494a3a997b508d32',
 			'com.google.dagger:dagger-compiler:2.0.2:dagger-compiler-2.0.2.jar:b74bc9de063dd4c6400b232231f2ef5056145b8fbecbf5382012007dd1c071b3',

bramble-android/src/main/java/org/briarproject/bramble/plugin/bluetooth/AndroidBluetoothPlugin.java

@@ -38,6 +38,7 @@ import static android.bluetooth.BluetoothAdapter.SCAN_MODE_NONE;
 import static android.bluetooth.BluetoothAdapter.STATE_OFF;
 import static android.bluetooth.BluetoothAdapter.STATE_ON;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -145,7 +146,7 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 		try {
 			if (ss != null) ss.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -185,7 +186,7 @@ class AndroidBluetoothPlugin extends BluetoothPlugin<BluetoothServerSocket> {
 		try {
 			if (c != null) c.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 

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

@@ -10,7 +10,6 @@ import android.content.pm.PackageManager.NameNotFoundException;
 import android.content.res.Resources;
 import android.net.ConnectivityManager;
 import android.net.NetworkInfo;
-import android.os.FileObserver;
 import android.os.PowerManager;
 
 import net.freehaven.tor.control.EventHandler;
@@ -34,8 +33,10 @@ import org.briarproject.bramble.api.plugin.duplex.DuplexTransportConnection;
 import org.briarproject.bramble.api.properties.TransportProperties;
 import org.briarproject.bramble.api.settings.Settings;
 import org.briarproject.bramble.api.settings.event.SettingsUpdatedEvent;
+import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.api.system.LocationUtils;
 import org.briarproject.bramble.util.IoUtils;
+import org.briarproject.bramble.util.RenewableWakeLock;
 import org.briarproject.bramble.util.StringUtils;
 
 import java.io.Closeable;
@@ -55,7 +56,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Scanner;
-import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.Executor;
 import java.util.concurrent.Future;
 import java.util.concurrent.ScheduledExecutorService;
@@ -78,7 +78,6 @@ import static android.net.ConnectivityManager.TYPE_WIFI;
 import static android.os.Build.VERSION.SDK_INT;
 import static android.os.PowerManager.ACTION_DEVICE_IDLE_MODE_CHANGED;
 import static android.os.PowerManager.PARTIAL_WAKE_LOCK;
-import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static java.util.concurrent.TimeUnit.MINUTES;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
@@ -92,6 +91,7 @@ import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_NETWORK_
 import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_NETWORK_WIFI;
 import static org.briarproject.bramble.api.plugin.TorConstants.PREF_TOR_PORT;
 import static org.briarproject.bramble.api.plugin.TorConstants.PROP_ONION;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubOnion;
 
 @MethodsNotNullByDefault
@@ -102,8 +102,11 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 			"CIRC", "ORCONN", "HS_DESC", "NOTICE", "WARN", "ERR"
 	};
 	private static final String OWNER = "__OwningControllerProcess";
-	private static final int COOKIE_TIMEOUT = 3000; // Milliseconds
+	private static final int COOKIE_TIMEOUT_MS = 3000;
+	private static final int COOKIE_POLLING_INTERVAL_MS = 200;
 	private static final Pattern ONION = Pattern.compile("[a-z2-7]{16}");
+	// This tag may prevent Huawei's power manager from killing us
+	private static final String WAKE_LOCK_TAG = "LocationManagerService";
 	private static final Logger LOG =
 			Logger.getLogger(TorPlugin.class.getName());
 
@@ -112,6 +115,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	private final Context appContext;
 	private final LocationUtils locationUtils;
 	private final SocketFactory torSocketFactory;
+	private final Clock clock;
 	private final Backoff backoff;
 	private final DuplexPluginCallback callback;
 	private final String architecture;
@@ -119,7 +123,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 	private final ConnectionStatus connectionStatus;
 	private final File torDirectory, torFile, geoIpFile, configFile;
 	private final File doneFile, cookieFile;
-	private final PowerManager.WakeLock wakeLock;
+	private final RenewableWakeLock wakeLock;
 	private final AtomicReference<Future<?>> connectivityCheck =
 			new AtomicReference<>();
 	private final AtomicBoolean used = new AtomicBoolean(false);
@@ -132,7 +136,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 
 	TorPlugin(Executor ioExecutor, ScheduledExecutorService scheduler,
 			Context appContext, LocationUtils locationUtils,
-			SocketFactory torSocketFactory, Backoff backoff,
+			SocketFactory torSocketFactory, Clock clock, Backoff backoff,
 			DuplexPluginCallback callback, String architecture,
 			int maxLatency, int maxIdleTime) {
 		this.ioExecutor = ioExecutor;
@@ -140,6 +144,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		this.appContext = appContext;
 		this.locationUtils = locationUtils;
 		this.torSocketFactory = torSocketFactory;
+		this.clock = clock;
 		this.backoff = backoff;
 		this.callback = callback;
 		this.architecture = architecture;
@@ -155,14 +160,13 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		configFile = new File(torDirectory, "torrc");
 		doneFile = new File(torDirectory, "done");
 		cookieFile = new File(torDirectory, ".tor/control_auth_cookie");
-		Object o = appContext.getSystemService(POWER_SERVICE);
-		PowerManager pm = (PowerManager) o;
-		// This tag will prevent Huawei's powermanager from killing us.
-		wakeLock = pm.newWakeLock(PARTIAL_WAKE_LOCK, "LocationManagerService");
-		wakeLock.setReferenceCounted(false);
 		// Don't execute more than one connection status check at a time
 		connectionStatusExecutor = new PoliteExecutor("TorPlugin",
 				ioExecutor, 1);
+		PowerManager pm = (PowerManager)
+				appContext.getSystemService(POWER_SERVICE);
+		wakeLock = new RenewableWakeLock(pm, scheduler, PARTIAL_WAKE_LOCK,
+				WAKE_LOCK_TAG, 1, MINUTES);
 	}
 
 	@Override
@@ -185,18 +189,10 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		if (used.getAndSet(true)) throw new IllegalStateException();
 		// Install or update the assets if necessary
 		if (!assetsAreUpToDate()) installAssets();
-		LOG.info("Starting Tor");
-		// Watch for the auth cookie file being updated
-		try {
-			cookieFile.getParentFile().mkdirs();
-			cookieFile.createNewFile();
-		} catch (IOException e) {
-			throw new PluginException(e);
-		}
-		CountDownLatch latch = new CountDownLatch(1);
-		FileObserver obs = new WriteObserver(cookieFile, latch);
-		obs.startWatching();
+		if (cookieFile.exists() && !cookieFile.delete())
+			LOG.warning("Old auth cookie not deleted");
 		// Start a new Tor process
+		LOG.info("Starting Tor");
 		String torPath = torFile.getAbsolutePath();
 		String configPath = configFile.getAbsolutePath();
 		String pid = String.valueOf(android.os.Process.myPid());
@@ -235,11 +231,16 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				throw new PluginException();
 			}
 			// Wait for the auth cookie file to be created/updated
-			if (!latch.await(COOKIE_TIMEOUT, MILLISECONDS)) {
-				LOG.warning("Auth cookie not created");
-				if (LOG.isLoggable(INFO)) listFiles(torDirectory);
-				throw new PluginException();
+			long start = clock.currentTimeMillis();
+			while (cookieFile.length() < 32) {
+				if (clock.currentTimeMillis() - start > COOKIE_TIMEOUT_MS) {
+					LOG.warning("Auth cookie not created");
+					if (LOG.isLoggable(INFO)) listFiles(torDirectory);
+					throw new PluginException();
+				}
+				Thread.sleep(COOKIE_POLLING_INTERVAL_MS);
 			}
+			LOG.info("Auth cookie created");
 		} catch (InterruptedException e) {
 			LOG.warning("Interrupted while starting Tor");
 			Thread.currentThread().interrupt();
@@ -347,7 +348,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		try {
 			if (c != null) c.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -355,7 +356,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		try {
 			if (s != null) s.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -364,7 +365,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 			File[] children = f.listFiles();
 			if (children != null) for (File child : children) listFiles(child);
 		} else {
-			LOG.info(f.getAbsolutePath());
+			LOG.info(f.getAbsolutePath() + " " + f.length());
 		}
 	}
 
@@ -397,7 +398,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				ss = new ServerSocket();
 				ss.bind(new InetSocketAddress("127.0.0.1", port));
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				tryToClose(ss);
 				return;
 			}
@@ -423,7 +424,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 		try {
 			if (ss != null) ss.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		} finally {
 			callback.transportDisabled();
 		}
@@ -442,7 +443,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				response = controlConnection.addOnion(portLines);
 			else response = controlConnection.addOnion(privKey, portLines);
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return;
 		}
 		if (!response.containsKey(HS_ADDRESS)) {
@@ -510,7 +511,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 				controlConnection.shutdownTor("TERM");
 				controlSocket.close();
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 		wakeLock.release();
@@ -641,22 +642,6 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 			LOG.info("Descriptor uploaded");
 	}
 
-	private static class WriteObserver extends FileObserver {
-
-		private final CountDownLatch latch;
-
-		private WriteObserver(File file, CountDownLatch latch) {
-			super(file.getAbsolutePath(), CLOSE_WRITE);
-			this.latch = latch;
-		}
-
-		@Override
-		public void onEvent(int event, @Nullable String path) {
-			stopWatching();
-			latch.countDown();
-		}
-	}
-
 	@Override
 	public void eventOccurred(Event e) {
 		if (e instanceof SettingsUpdatedEvent) {
@@ -704,7 +689,7 @@ class TorPlugin implements DuplexPlugin, EventHandler, EventListener {
 					enableNetwork(true);
 				}
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}

bramble-android/src/main/java/org/briarproject/bramble/plugin/tor/TorPluginFactory.java

@@ -12,6 +12,7 @@ import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPlugin;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginCallback;
 import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
+import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.api.system.LocationUtils;
 import org.briarproject.bramble.util.AndroidUtils;
 
@@ -42,11 +43,13 @@ public class TorPluginFactory implements DuplexPluginFactory {
 	private final EventBus eventBus;
 	private final SocketFactory torSocketFactory;
 	private final BackoffFactory backoffFactory;
+	private final Clock clock;
 
 	public TorPluginFactory(Executor ioExecutor,
 			ScheduledExecutorService scheduler, Context appContext,
 			LocationUtils locationUtils, EventBus eventBus,
-			SocketFactory torSocketFactory, BackoffFactory backoffFactory) {
+			SocketFactory torSocketFactory, BackoffFactory backoffFactory,
+			Clock clock) {
 		this.ioExecutor = ioExecutor;
 		this.scheduler = scheduler;
 		this.appContext = appContext;
@@ -54,6 +57,7 @@ public class TorPluginFactory implements DuplexPluginFactory {
 		this.eventBus = eventBus;
 		this.torSocketFactory = torSocketFactory;
 		this.backoffFactory = backoffFactory;
+		this.clock = clock;
 	}
 
 	@Override
@@ -90,7 +94,7 @@ public class TorPluginFactory implements DuplexPluginFactory {
 		Backoff backoff = backoffFactory.createBackoff(MIN_POLLING_INTERVAL,
 				MAX_POLLING_INTERVAL, BACKOFF_BASE);
 		TorPlugin plugin = new TorPlugin(ioExecutor, scheduler, appContext,
-				locationUtils, torSocketFactory, backoff, callback,
+				locationUtils, torSocketFactory, clock, backoff, callback,
 				architecture, MAX_LATENCY, MAX_IDLE_TIME);
 		eventBus.addListener(plugin);
 		return plugin;

bramble-android/src/main/java/org/briarproject/bramble/util/RenewableWakeLock.java

@@ -0,0 +1,100 @@
+package org.briarproject.bramble.util;
+
+import android.os.PowerManager;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.ScheduledFuture;
+import java.util.concurrent.TimeUnit;
+import java.util.logging.Logger;
+
+import javax.annotation.Nullable;
+import javax.annotation.concurrent.ThreadSafe;
+
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
+import static java.util.logging.Level.INFO;
+
+@ThreadSafe
+@NotNullByDefault
+public class RenewableWakeLock {
+
+	private static final Logger LOG =
+			Logger.getLogger(RenewableWakeLock.class.getName());
+
+	/**
+	 * Automatically release the lock this many milliseconds after it's due
+	 * to have been replaced and released.
+	 */
+	private static final int SAFETY_MARGIN_MS = 10_000;
+
+	private final PowerManager powerManager;
+	private final ScheduledExecutorService scheduler;
+	private final int levelAndFlags;
+	private final String tag;
+	private final long durationMs;
+	private final Runnable renewTask;
+
+	private final Object lock = new Object();
+	@Nullable
+	private PowerManager.WakeLock wakeLock; // Locking: lock
+	@Nullable
+	private ScheduledFuture future; // Locking: lock
+
+	public RenewableWakeLock(PowerManager powerManager,
+			ScheduledExecutorService scheduler, int levelAndFlags, String tag,
+			long duration, TimeUnit timeUnit) {
+		this.powerManager = powerManager;
+		this.scheduler = scheduler;
+		this.levelAndFlags = levelAndFlags;
+		this.tag = tag;
+		durationMs = MILLISECONDS.convert(duration, timeUnit);
+		renewTask = this::renew;
+	}
+
+	public void acquire() {
+		if (LOG.isLoggable(INFO)) LOG.info("Acquiring wake lock " + tag);
+		synchronized (lock) {
+			if (wakeLock != null) {
+				LOG.info("Already acquired");
+				return;
+			}
+			wakeLock = powerManager.newWakeLock(levelAndFlags, tag);
+			wakeLock.setReferenceCounted(false);
+			wakeLock.acquire(durationMs + SAFETY_MARGIN_MS);
+			future = scheduler.schedule(renewTask, durationMs, MILLISECONDS);
+		}
+	}
+
+	private void renew() {
+		if (LOG.isLoggable(INFO)) LOG.info("Renewing wake lock " + tag);
+		synchronized (lock) {
+			if (wakeLock == null) {
+				LOG.info("Already released");
+				return;
+			}
+			PowerManager.WakeLock oldWakeLock = wakeLock;
+			wakeLock = powerManager.newWakeLock(levelAndFlags, tag);
+			wakeLock.setReferenceCounted(false);
+			wakeLock.acquire(durationMs + SAFETY_MARGIN_MS);
+			oldWakeLock.release();
+			future = scheduler.schedule(renewTask, durationMs, MILLISECONDS);
+		}
+	}
+
+	public void release() {
+		if (LOG.isLoggable(INFO)) LOG.info("Releasing wake lock " + tag);
+		synchronized (lock) {
+			if (wakeLock == null) {
+				LOG.info("Already released");
+				return;
+			}
+			if (future == null) throw new AssertionError();
+			future.cancel(false);
+			future = null;
+			wakeLock.release();
+			wakeLock = null;
+		}
+	}
+}
+

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

@@ -0,0 +1,36 @@
+package org.briarproject.bramble.util;
+
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import static java.util.logging.Level.FINE;
+
+public class LogUtils {
+
+	private static final int NANOS_PER_MILLI = 1000 * 1000;
+
+	/**
+	 * Returns the elapsed time in milliseconds since some arbitrary
+	 * starting time. This is only useful for measuring elapsed time.
+	 */
+	public static long now() {
+		return System.nanoTime() / NANOS_PER_MILLI;
+	}
+
+	/**
+	 * Logs the duration of a task.
+	 * @param logger the logger to use
+	 * @param task a description of the task
+	 * @param start the start time of the task, as returned by {@link #now()}
+	 */
+	public static void logDuration(Logger logger, String task, long start) {
+		if (logger.isLoggable(FINE)) {
+			long duration = now() - start;
+			logger.fine(task + " took " + duration + " ms");
+		}
+	}
+
+	public static void logException(Logger logger, Level level, Throwable t) {
+		if (logger.isLoggable(level)) logger.log(level, t.toString(), t);
+	}
+}

bramble-core/src/main/java/org/briarproject/bramble/PoliteExecutor.java

@@ -5,12 +5,12 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import java.util.LinkedList;
 import java.util.Queue;
 import java.util.concurrent.Executor;
-import java.util.logging.Level;
 import java.util.logging.Logger;
 
 import javax.annotation.concurrent.GuardedBy;
 
 import static java.util.logging.Level.FINE;
+import static org.briarproject.bramble.util.LogUtils.now;
 
 /**
  * An {@link Executor} that delegates its tasks to another {@link Executor}
@@ -20,8 +20,6 @@ import static java.util.logging.Level.FINE;
 @NotNullByDefault
 public class PoliteExecutor implements Executor {
 
-	private static final Level LOG_LEVEL = FINE;
-
 	private final Object lock = new Object();
 	@GuardedBy("lock")
 	private final Queue<Runnable> queue = new LinkedList<>();
@@ -49,11 +47,11 @@ public class PoliteExecutor implements Executor {
 
 	@Override
 	public void execute(Runnable r) {
-		long submitted = System.currentTimeMillis();
+		long submitted = now();
 		Runnable wrapped = () -> {
-			if (log.isLoggable(LOG_LEVEL)) {
-				long queued = System.currentTimeMillis() - submitted;
-				log.log(LOG_LEVEL, "Queue time " + queued + " ms");
+			if (log.isLoggable(FINE)) {
+				long queued = now() - submitted;
+				log.fine("Queue time " + queued + " ms");
 			}
 			try {
 				r.run();

bramble-core/src/main/java/org/briarproject/bramble/TimeLoggingExecutor.java

@@ -6,16 +6,14 @@ import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.RejectedExecutionHandler;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
-import java.util.logging.Level;
 import java.util.logging.Logger;
 
 import static java.util.logging.Level.FINE;
+import static org.briarproject.bramble.util.LogUtils.now;
 
 @NotNullByDefault
 public class TimeLoggingExecutor extends ThreadPoolExecutor {
 
-	private static final Level LOG_LEVEL = FINE;
-
 	private final Logger log;
 
 	public TimeLoggingExecutor(String tag, int corePoolSize, int maxPoolSize,
@@ -29,15 +27,15 @@ public class TimeLoggingExecutor extends ThreadPoolExecutor {
 
 	@Override
 	public void execute(Runnable r) {
-		if (log.isLoggable(LOG_LEVEL)) {
-			long submitted = System.currentTimeMillis();
+		if (log.isLoggable(FINE)) {
+			long submitted = now();
 			super.execute(() -> {
-				long started = System.currentTimeMillis();
+				long started = now();
 				long queued = started - submitted;
-				log.log(LOG_LEVEL, "Queue time " + queued + " ms");
+				log.fine("Queue time " + queued + " ms");
 				r.run();
-				long executing = System.currentTimeMillis() - started;
-				log.log(LOG_LEVEL, "Execution time " + executing + " ms");
+				long executing = now() - started;
+				log.fine("Execution time " + executing + " ms");
 			});
 		} else {
 			super.execute(r);

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

@@ -46,6 +46,7 @@ import javax.inject.Inject;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.contact.RecordTypes.CONTACT_INFO;
 import static org.briarproject.bramble.api.identity.AuthorConstants.MAX_SIGNATURE_LENGTH;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.ValidationUtils.checkLength;
 import static org.briarproject.bramble.util.ValidationUtils.checkSize;
 
@@ -122,7 +123,7 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 			in = conn.getReader().getInputStream();
 			out = conn.getWriter().getOutputStream();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			listener.contactExchangeFailed();
 			tryToClose(conn);
 			return;
@@ -133,7 +134,7 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 		try {
 			localProperties = transportPropertyManager.getLocalProperties();
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			listener.contactExchangeFailed();
 			tryToClose(conn);
 			return;
@@ -194,7 +195,7 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 				LOG.info("End of stream");
 			}
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			listener.contactExchangeFailed();
 			tryToClose(conn);
 			return;
@@ -222,11 +223,11 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 			LOG.info("Pseudonym exchange succeeded");
 			listener.contactExchangeSucceeded(remoteInfo.author);
 		} catch (ContactExistsException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			tryToClose(conn);
 			listener.duplicateContact(remoteInfo.author);
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			tryToClose(conn);
 			listener.contactExchangeFailed();
 		}
@@ -307,7 +308,7 @@ class ContactExchangeTaskImpl extends Thread implements ContactExchangeTask {
 			conn.getReader().dispose(true, true);
 			conn.getWriter().dispose(true);
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/crypto/CryptoComponentImpl.java

@@ -32,6 +32,8 @@ import javax.inject.Inject;
 
 import static java.util.logging.Level.INFO;
 import static org.briarproject.bramble.util.ByteUtils.INT_32_BYTES;
+import static org.briarproject.bramble.util.LogUtils.logDuration;
+import static org.briarproject.bramble.util.LogUtils.now;
 
 @NotNullByDefault
 class CryptoComponentImpl implements CryptoComponent {
@@ -127,16 +129,14 @@ class CryptoComponentImpl implements CryptoComponent {
 			throw new IllegalArgumentException();
 		if (!(pub instanceof Curve25519PublicKey))
 			throw new IllegalArgumentException();
-		long now = System.currentTimeMillis();
+		long start = now();
 		byte[] secret = curve25519.calculateAgreement(pub.getEncoded(),
 				priv.getEncoded());
 		// If the shared secret is all zeroes, the public key is invalid
 		byte allZero = 0;
 		for (byte b : secret) allZero |= b;
 		if (allZero == 0) throw new GeneralSecurityException();
-		long duration = System.currentTimeMillis() - now;
-		if (LOG.isLoggable(INFO))
-			LOG.info("Deriving shared secret took " + duration + " ms");
+		logDuration(LOG, "Deriving shared secret", start);
 		return secret;
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/crypto/ScryptKdf.java

@@ -10,6 +10,8 @@ import java.util.logging.Logger;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.INFO;
+import static org.briarproject.bramble.util.LogUtils.logDuration;
+import static org.briarproject.bramble.util.LogUtils.now;
 
 class ScryptKdf implements PasswordBasedKdf {
 
@@ -50,13 +52,11 @@ class ScryptKdf implements PasswordBasedKdf {
 
 	@Override
 	public SecretKey deriveKey(String password, byte[] salt, int cost) {
-		long start = System.currentTimeMillis();
+		long start = now();
 		byte[] passwordBytes = StringUtils.toUtf8(password);
 		SecretKey k = new SecretKey(SCrypt.generate(passwordBytes, salt, cost,
 				BLOCK_SIZE, PARALLELIZATION, SecretKey.LENGTH));
-		long duration = System.currentTimeMillis() - start;
-		if (LOG.isLoggable(INFO))
-			LOG.info("Deriving key from password took " + duration + " ms");
+		logDuration(LOG, "Deriving key from password", start);
 		return k;
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/crypto/Sec1KeyParser.java

@@ -16,7 +16,8 @@ import java.util.logging.Logger;
 
 import javax.annotation.concurrent.Immutable;
 
-import static java.util.logging.Level.INFO;
+import static org.briarproject.bramble.util.LogUtils.logDuration;
+import static org.briarproject.bramble.util.LogUtils.now;
 
 /**
  * A key parser that uses the encoding defined in "SEC 1: Elliptic Curve
@@ -48,7 +49,7 @@ class Sec1KeyParser implements KeyParser {
 			throws GeneralSecurityException {
 		// The validation procedure comes from SEC 1, section 3.2.2.1. Note
 		// that SEC 1 parameter names are used below, not RFC 5639 names
-		long now = System.currentTimeMillis();
+		long start = now();
 		if (encodedKey.length != publicKeyBytes)
 			throw new GeneralSecurityException();
 		// The first byte must be 0x04
@@ -80,16 +81,14 @@ class Sec1KeyParser implements KeyParser {
 		// Construct a public key from the point (x, y) and the params
 		ECPublicKeyParameters k = new ECPublicKeyParameters(pub, params);
 		PublicKey p = new Sec1PublicKey(k);
-		long duration = System.currentTimeMillis() - now;
-		if (LOG.isLoggable(INFO))
-			LOG.info("Parsing public key took " + duration + " ms");
+		logDuration(LOG, "Parsing public key", start);
 		return p;
 	}
 
 	@Override
 	public PrivateKey parsePrivateKey(byte[] encodedKey)
 			throws GeneralSecurityException {
-		long now = System.currentTimeMillis();
+		long start = now();
 		if (encodedKey.length != privateKeyBytes)
 			throw new GeneralSecurityException();
 		BigInteger d = new BigInteger(1, encodedKey); // Positive signum
@@ -99,9 +98,7 @@ class Sec1KeyParser implements KeyParser {
 		// Construct a private key from the private value and the params
 		ECPrivateKeyParameters k = new ECPrivateKeyParameters(d, params);
 		PrivateKey p = new Sec1PrivateKey(k, keyBits);
-		long duration = System.currentTimeMillis() - now;
-		if (LOG.isLoggable(INFO))
-			LOG.info("Parsing private key took " + duration + " ms");
+		logDuration(LOG, "Parsing private key", start);
 		return p;
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/db/DatabaseComponentImpl.java

@@ -68,13 +68,15 @@ import javax.annotation.Nullable;
 import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
 
-import static java.util.logging.Level.FINE;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.sync.Group.Visibility.INVISIBLE;
 import static org.briarproject.bramble.api.sync.Group.Visibility.SHARED;
 import static org.briarproject.bramble.api.sync.ValidationManager.State.DELIVERED;
 import static org.briarproject.bramble.api.sync.ValidationManager.State.UNKNOWN;
 import static org.briarproject.bramble.db.DatabaseConstants.MAX_OFFERED_MESSAGES;
+import static org.briarproject.bramble.util.LogUtils.logDuration;
+import static org.briarproject.bramble.util.LogUtils.logException;
+import static org.briarproject.bramble.util.LogUtils.now;
 
 @ThreadSafe
 @NotNullByDefault
@@ -108,7 +110,7 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 			try {
 				close();
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 		return reopened;
@@ -125,13 +127,13 @@ class DatabaseComponentImpl<T> implements DatabaseComponent {
 		// Don't allow reentrant locking
 		if (lock.getReadHoldCount() > 0) throw new IllegalStateException();
 		if (lock.getWriteHoldCount() > 0) throw new IllegalStateException();
-		long start = System.currentTimeMillis();
-		if (readOnly) lock.readLock().lock();
-		else lock.writeLock().lock();
-		if (LOG.isLoggable(FINE)) {
-			long duration = System.currentTimeMillis() - start;
-			if (readOnly) LOG.fine("Waited " + duration + " ms for read lock");
-			else LOG.fine("Waited " + duration + " ms for write lock");
+		long start = now();
+		if (readOnly) {
+			lock.readLock().lock();
+			logDuration(LOG, "Waiting for read lock", start);
+		} else {
+			lock.writeLock().lock();
+			logDuration(LOG, "Waiting for write lock", start);
 		}
 		try {
 			return new Transaction(db.startTransaction(), readOnly);

bramble-core/src/main/java/org/briarproject/bramble/db/JdbcDatabase.java

@@ -66,6 +66,7 @@ import static org.briarproject.bramble.api.sync.ValidationManager.State.UNKNOWN;
 import static org.briarproject.bramble.db.DatabaseConstants.DB_SETTINGS_NAMESPACE;
 import static org.briarproject.bramble.db.DatabaseConstants.SCHEMA_VERSION_KEY;
 import static org.briarproject.bramble.db.ExponentialBackoff.calculateExpiry;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 /**
  * A generic database implementation that can be used with any JDBC-compatible
@@ -404,7 +405,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 		try {
 			if (rs != null) rs.close();
 		} catch (SQLException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -412,7 +413,7 @@ abstract class JdbcDatabase implements Database<Connection> {
 		try {
 			if (s != null) s.close();
 		} catch (SQLException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -509,12 +510,11 @@ abstract class JdbcDatabase implements Database<Connection> {
 			}
 		} catch (SQLException e) {
 			// Try to close the connection
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			try {
 				txn.close();
 			} catch (SQLException e1) {
-				if (LOG.isLoggable(WARNING))
-					LOG.log(WARNING, e1.toString(), e1);
+				logException(LOG, WARNING, e1);
 			}
 			// Whatever happens, allow the database to close
 			connectionsLock.lock();

bramble-core/src/main/java/org/briarproject/bramble/db/Migration38_39.java

@@ -10,6 +10,7 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 class Migration38_39 implements Migration<Connection> {
 
@@ -48,7 +49,7 @@ class Migration38_39 implements Migration<Connection> {
 		try {
 			if (s != null) s.close();
 		} catch (SQLException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/keyagreement/KeyAgreementConnector.java

@@ -31,6 +31,7 @@ import javax.annotation.Nullable;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.CONNECTION_TIMEOUT;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
 class KeyAgreementConnector {
@@ -134,7 +135,7 @@ class KeyAgreementConnector {
 			Thread.currentThread().interrupt();
 			return null;
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return null;
 		} finally {
 			stopListening();

bramble-core/src/main/java/org/briarproject/bramble/keyagreement/KeyAgreementTaskImpl.java

@@ -28,6 +28,7 @@ import java.util.logging.Logger;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -120,13 +121,11 @@ class KeyAgreementTaskImpl extends Thread implements KeyAgreementTask,
 			// Broadcast result to caller
 			eventBus.broadcast(new KeyAgreementFinishedEvent(result));
 		} catch (AbortException e) {
-			if (LOG.isLoggable(WARNING))
-				LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			// Notify caller that the protocol was aborted
 			eventBus.broadcast(new KeyAgreementAbortedEvent(e.receivedAbort));
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING))
-				LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			// Notify caller that the connection failed
 			eventBus.broadcast(new KeyAgreementFailedEvent());
 		}

bramble-core/src/main/java/org/briarproject/bramble/keyagreement/KeyAgreementTransport.java

@@ -20,6 +20,7 @@ import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.PR
 import static org.briarproject.bramble.api.keyagreement.RecordTypes.ABORT;
 import static org.briarproject.bramble.api.keyagreement.RecordTypes.CONFIRM;
 import static org.briarproject.bramble.api.keyagreement.RecordTypes.KEY;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 /**
  * Handles the sending and receiving of BQP records.
@@ -72,7 +73,7 @@ class KeyAgreementTransport {
 		try {
 			writeRecord(ABORT, new byte[0]);
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			exception = true;
 		}
 		tryToClose(exception);
@@ -83,7 +84,7 @@ class KeyAgreementTransport {
 			kac.getConnection().getReader().dispose(exception, true);
 			kac.getConnection().getWriter().dispose(exception);
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/lifecycle/LifecycleManagerImpl.java

@@ -30,6 +30,7 @@ import javax.annotation.Nullable;
 import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
 
+import static java.util.logging.Level.FINE;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.MIGRATING_DATABASE;
@@ -43,6 +44,9 @@ import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResul
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.DB_ERROR;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.SERVICE_ERROR;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.SUCCESS;
+import static org.briarproject.bramble.util.LogUtils.logDuration;
+import static org.briarproject.bramble.util.LogUtils.logException;
+import static org.briarproject.bramble.util.LogUtils.now;
 
 @ThreadSafe
 @NotNullByDefault
@@ -101,24 +105,20 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 	}
 
 	private LocalAuthor createLocalAuthor(String nickname) {
-		long now = System.currentTimeMillis();
+		long start = now();
 		KeyPair keyPair = crypto.generateSignatureKeyPair();
 		byte[] publicKey = keyPair.getPublic().getEncoded();
 		byte[] privateKey = keyPair.getPrivate().getEncoded();
 		LocalAuthor localAuthor = authorFactory
 				.createLocalAuthor(nickname, publicKey, privateKey);
-		long duration = System.currentTimeMillis() - now;
-		if (LOG.isLoggable(INFO))
-			LOG.info("Creating local author took " + duration + " ms");
+		logDuration(LOG, "Creating local author", start);
 		return localAuthor;
 	}
 
 	private void registerLocalAuthor(LocalAuthor author) throws DbException {
-		long now = System.currentTimeMillis();
+		long start = now();
 		identityManager.registerLocalAuthor(author);
-		long duration = System.currentTimeMillis() - now;
-		if (LOG.isLoggable(INFO))
-			LOG.info("Registering local author took " + duration + " ms");
+		logDuration(LOG, "Registering local author", start);
 	}
 
 	@Override
@@ -129,15 +129,11 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 		}
 		try {
 			LOG.info("Starting services");
-			long start = System.currentTimeMillis();
+			long start = now();
 
 			boolean reopened = db.open(this);
-			long duration = System.currentTimeMillis() - start;
-			if (LOG.isLoggable(INFO)) {
-				if (reopened)
-					LOG.info("Reopening database took " + duration + " ms");
-				else LOG.info("Creating database took " + duration + " ms");
-			}
+			if (reopened) logDuration(LOG, "Reopening database", start);
+			else logDuration(LOG, "Creating database", start);
 
 			if (nickname != null) {
 				registerLocalAuthor(createLocalAuthor(nickname));
@@ -150,13 +146,11 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 			Transaction txn = db.startTransaction(false);
 			try {
 				for (Client c : clients) {
-					start = System.currentTimeMillis();
+					start = now();
 					c.createLocalState(txn);
-					duration = System.currentTimeMillis() - start;
-					if (LOG.isLoggable(INFO)) {
-						LOG.info("Starting client "
-								+ c.getClass().getSimpleName()
-								+ " took " + duration + " ms");
+					if (LOG.isLoggable(FINE)) {
+						logDuration(LOG, "Starting client "
+								+ c.getClass().getSimpleName(), start);
 					}
 				}
 				db.commitTransaction(txn);
@@ -164,12 +158,11 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 				db.endTransaction(txn);
 			}
 			for (Service s : services) {
-				start = System.currentTimeMillis();
+				start = now();
 				s.startService();
-				duration = System.currentTimeMillis() - start;
-				if (LOG.isLoggable(INFO)) {
-					LOG.info("Starting service " + s.getClass().getSimpleName()
-							+ " took " + duration + " ms");
+				if (LOG.isLoggable(FINE)) {
+					logDuration(LOG, "Starting service "
+							+ s.getClass().getSimpleName(), start);
 				}
 			}
 
@@ -178,16 +171,16 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 			eventBus.broadcast(new LifecycleEvent(RUNNING));
 			return SUCCESS;
 		} catch (DataTooOldException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return DATA_TOO_OLD_ERROR;
 		} catch (DataTooNewException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return DATA_TOO_NEW_ERROR;
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return DB_ERROR;
 		} catch (ServiceException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return SERVICE_ERROR;
 		} finally {
 			startStopSemaphore.release();
@@ -213,29 +206,26 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 			state = STOPPING;
 			eventBus.broadcast(new LifecycleEvent(STOPPING));
 			for (Service s : services) {
-				long start = System.currentTimeMillis();
+				long start = now();
 				s.stopService();
-				long duration = System.currentTimeMillis() - start;
-				if (LOG.isLoggable(INFO)) {
-					LOG.info("Stopping service " + s.getClass().getSimpleName()
-							+ " took " + duration + " ms");
+				if (LOG.isLoggable(FINE)) {
+					logDuration(LOG, "Stopping service "
+							+ s.getClass().getSimpleName(), start);
 				}
 			}
 			for (ExecutorService e : executors) {
-				if (LOG.isLoggable(INFO)) {
-					LOG.info("Stopping executor "
+				if (LOG.isLoggable(FINE)) {
+					LOG.fine("Stopping executor "
 							+ e.getClass().getSimpleName());
 				}
 				e.shutdownNow();
 			}
-			long start = System.currentTimeMillis();
+			long start = now();
 			db.close();
-			long duration = System.currentTimeMillis() - start;
-			if (LOG.isLoggable(INFO))
-				LOG.info("Closing database took " + duration + " ms");
+			logDuration(LOG, "Closing database", start);
 			shutdownLatch.countDown();
 		} catch (DbException | ServiceException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		} finally {
 			startStopSemaphore.release();
 		}

bramble-core/src/main/java/org/briarproject/bramble/plugin/ConnectionManagerImpl.java

@@ -27,6 +27,7 @@ import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.transport.TransportConstants.TAG_LENGTH;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 class ConnectionManagerImpl implements ConnectionManager {
 
@@ -135,7 +136,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				byte[] tag = readTag(reader);
 				ctx = keyManager.getStreamContext(transportId, tag);
 			} catch (IOException | DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeReader(true, false);
 				return;
 			}
@@ -151,7 +152,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				createIncomingSession(ctx, reader).run();
 				disposeReader(false, true);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeReader(true, true);
 			} finally {
 				connectionRegistry.unregisterConnection(contactId, transportId,
@@ -163,7 +164,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 			try {
 				reader.dispose(exception, recognised);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 	}
@@ -188,7 +189,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 			try {
 				ctx = keyManager.getStreamContext(contactId, transportId);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeWriter(true);
 				return;
 			}
@@ -204,7 +205,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				createSimplexOutgoingSession(ctx, writer).run();
 				disposeWriter(false);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeWriter(true);
 			} finally {
 				connectionRegistry.unregisterConnection(contactId, transportId,
@@ -216,7 +217,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 			try {
 				writer.dispose(exception);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 	}
@@ -246,7 +247,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				byte[] tag = readTag(reader);
 				ctx = keyManager.getStreamContext(transportId, tag);
 			} catch (IOException | DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeReader(true, false);
 				return;
 			}
@@ -265,7 +266,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				incomingSession.run();
 				disposeReader(false, true);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeReader(true, true);
 			} finally {
 				connectionRegistry.unregisterConnection(contactId, transportId,
@@ -279,7 +280,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 			try {
 				ctx = keyManager.getStreamContext(contactId, transportId);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeWriter(true);
 				return;
 			}
@@ -294,7 +295,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				outgoingSession.run();
 				disposeWriter(false);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeWriter(true);
 			}
 		}
@@ -305,7 +306,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 			try {
 				reader.dispose(exception, recognised);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 
@@ -317,7 +318,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 			try {
 				writer.dispose(exception);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 	}
@@ -347,7 +348,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 			try {
 				ctx = keyManager.getStreamContext(contactId, transportId);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeWriter(true);
 				return;
 			}
@@ -364,7 +365,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				outgoingSession.run();
 				disposeWriter(false);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeWriter(true);
 			}
 		}
@@ -376,7 +377,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				byte[] tag = readTag(reader);
 				ctx = keyManager.getStreamContext(transportId, tag);
 			} catch (IOException | DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeReader(true, false);
 				return;
 			}
@@ -400,7 +401,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 				incomingSession.run();
 				disposeReader(false, true);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				disposeReader(true, true);
 			} finally {
 				connectionRegistry.unregisterConnection(contactId, transportId,
@@ -414,7 +415,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 			try {
 				reader.dispose(exception, recognised);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 
@@ -426,7 +427,7 @@ class ConnectionManagerImpl implements ConnectionManager {
 			try {
 				writer.dispose(exception);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 	}

bramble-core/src/main/java/org/briarproject/bramble/plugin/PluginManagerImpl.java

@@ -49,8 +49,12 @@ import java.util.logging.Logger;
 import javax.annotation.concurrent.ThreadSafe;
 import javax.inject.Inject;
 
+import static java.util.logging.Level.FINE;
 import static java.util.logging.Level.INFO;
 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;
 
 @ThreadSafe
 @NotNullByDefault
@@ -205,17 +209,16 @@ class PluginManagerImpl implements PluginManager, Service {
 		@Override
 		public void run() {
 			try {
-				long start = System.currentTimeMillis();
+				long start = now();
 				plugin.start();
-				long duration = System.currentTimeMillis() - start;
-				if (LOG.isLoggable(INFO)) {
-					LOG.info("Starting plugin " + plugin.getId() + " took " +
-							duration + " ms");
+				if (LOG.isLoggable(FINE)) {
+					logDuration(LOG, "Starting plugin " + plugin.getId(),
+							start);
 				}
 			} catch (PluginException e) {
 				if (LOG.isLoggable(WARNING)) {
 					LOG.warning("Plugin " + plugin.getId() + " did not start");
-					LOG.log(WARNING, e.toString(), e);
+					logException(LOG, WARNING, e);
 				}
 			} finally {
 				startLatch.countDown();
@@ -243,12 +246,11 @@ class PluginManagerImpl implements PluginManager, Service {
 				// Wait for the plugin to finish starting
 				startLatch.await();
 				// Stop the plugin
-				long start = System.currentTimeMillis();
+				long start = now();
 				plugin.stop();
-				long duration = System.currentTimeMillis() - start;
-				if (LOG.isLoggable(INFO)) {
-					LOG.info("Stopping plugin " + plugin.getId()
-							+ " took " + duration + " ms");
+				if (LOG.isLoggable(FINE)) {
+					logDuration(LOG, "Stopping plugin " + plugin.getId(),
+							start);
 				}
 			} catch (InterruptedException e) {
 				LOG.warning("Interrupted while waiting for plugin to stop");
@@ -256,7 +258,7 @@ class PluginManagerImpl implements PluginManager, Service {
 			} catch (PluginException e) {
 				if (LOG.isLoggable(WARNING)) {
 					LOG.warning("Plugin " + plugin.getId() + " did not stop");
-					LOG.log(WARNING, e.toString(), e);
+					logException(LOG, WARNING, e);
 				}
 			} finally {
 				stopLatch.countDown();
@@ -278,7 +280,7 @@ class PluginManagerImpl implements PluginManager, Service {
 			try {
 				return settingsManager.getSettings(id.getString());
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				return new Settings();
 			}
 		}
@@ -288,7 +290,7 @@ class PluginManagerImpl implements PluginManager, Service {
 			try {
 				return transportPropertyManager.getLocalProperties(id);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				return new TransportProperties();
 			}
 		}
@@ -298,7 +300,7 @@ class PluginManagerImpl implements PluginManager, Service {
 			try {
 				settingsManager.mergeSettings(s, id.getString());
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 
@@ -307,7 +309,7 @@ class PluginManagerImpl implements PluginManager, Service {
 			try {
 				transportPropertyManager.mergeLocalProperties(id, p);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 

bramble-core/src/main/java/org/briarproject/bramble/plugin/Poller.java

@@ -41,6 +41,7 @@ import javax.annotation.concurrent.ThreadSafe;
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @ThreadSafe
 @NotNullByDefault
@@ -134,7 +135,7 @@ class Poller implements EventListener {
 				if (w != null)
 					connectionManager.manageOutgoingConnection(c, t, w);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -150,7 +151,7 @@ class Poller implements EventListener {
 				if (d != null)
 					connectionManager.manageOutgoingConnection(c, t, d);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -211,7 +212,7 @@ class Poller implements EventListener {
 			remote.keySet().removeAll(connected);
 			if (!remote.isEmpty()) p.poll(remote);
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/plugin/bluetooth/BluetoothConnectionLimiterImpl.java

@@ -13,6 +13,7 @@ import javax.annotation.concurrent.ThreadSafe;
 
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
 @ThreadSafe
@@ -92,7 +93,7 @@ class BluetoothConnectionLimiterImpl implements BluetoothConnectionLimiter {
 			conn.getWriter().dispose(false);
 			conn.getReader().dispose(false, false);
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/plugin/bluetooth/BluetoothPlugin.java

@@ -43,6 +43,7 @@ import static org.briarproject.bramble.api.plugin.BluetoothConstants.PREF_BT_ENA
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.PROP_ADDRESS;
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.PROP_UUID;
 import static org.briarproject.bramble.api.plugin.BluetoothConstants.UUID_BYTES;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubMacAddress;
 
 @MethodsNotNullByDefault
@@ -169,7 +170,7 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 			try {
 				ss = openServerSocket(contactConnectionsUuid);
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				return;
 			}
 			if (!isRunning() || !shouldAllowContactConnections()) {
@@ -336,7 +337,7 @@ abstract class BluetoothPlugin<SS> implements DuplexPlugin, EventListener {
 		try {
 			ss = openServerSocket(uuid);
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return null;
 		}
 		if (!isRunning()) {

bramble-core/src/main/java/org/briarproject/bramble/plugin/file/FilePlugin.java

@@ -15,6 +15,7 @@ import java.util.logging.Logger;
 
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.plugin.FileConstants.PROP_PATH;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.StringUtils.isNullOrEmpty;
 
 @NotNullByDefault
@@ -51,7 +52,7 @@ abstract class FilePlugin implements SimplexPlugin {
 			FileInputStream in = new FileInputStream(file);
 			return new FileTransportReader(file, in, this);
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return null;
 		}
 	}
@@ -70,7 +71,7 @@ abstract class FilePlugin implements SimplexPlugin {
 			FileOutputStream out = new FileOutputStream(file);
 			return new FileTransportWriter(file, out, this);
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return null;
 		}
 	}

bramble-core/src/main/java/org/briarproject/bramble/plugin/file/FileTransportReader.java

@@ -9,6 +9,7 @@ import java.io.InputStream;
 import java.util.logging.Logger;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
 class FileTransportReader implements TransportConnectionReader {
@@ -36,7 +37,7 @@ class FileTransportReader implements TransportConnectionReader {
 		try {
 			in.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 		plugin.readerFinished(file, exception, recognised);
 	}

bramble-core/src/main/java/org/briarproject/bramble/plugin/file/FileTransportWriter.java

@@ -9,6 +9,7 @@ import java.io.OutputStream;
 import java.util.logging.Logger;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
 class FileTransportWriter implements TransportConnectionWriter {
@@ -46,7 +47,7 @@ class FileTransportWriter implements TransportConnectionWriter {
 		try {
 			out.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 		plugin.writerFinished(file, exception);
 	}

bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/LanTcpPlugin.java

@@ -35,6 +35,7 @@ import static org.briarproject.bramble.api.plugin.LanTcpConstants.ID;
 import static org.briarproject.bramble.api.plugin.LanTcpConstants.PREF_LAN_IP_PORTS;
 import static org.briarproject.bramble.api.plugin.LanTcpConstants.PROP_IP_PORTS;
 import static org.briarproject.bramble.util.ByteUtils.MAX_16_BIT_UNSIGNED;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubSocketAddress;
 
 @NotNullByDefault
@@ -295,7 +296,7 @@ class LanTcpPlugin extends TcpPlugin {
 			try {
 				ss.close();
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 	}

bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/PortMapperImpl.java

@@ -17,6 +17,7 @@ import javax.xml.parsers.ParserConfigurationException;
 
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubInetAddress;
 
 @ThreadSafe
@@ -59,7 +60,7 @@ class PortMapperImpl implements PortMapper {
 			if (externalString != null)
 				external = InetAddress.getByName(externalString);
 		} catch (IOException | SAXException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 		return new MappingResult(internal, external, port, succeeded);
 	}
@@ -76,7 +77,7 @@ class PortMapperImpl implements PortMapper {
 		try {
 			d.discover();
 		} catch (IOException | SAXException | ParserConfigurationException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 		gateway = d.getValidGateway();
 	}
@@ -87,7 +88,7 @@ class PortMapperImpl implements PortMapper {
 			if (LOG.isLoggable(INFO))
 				LOG.info("Deleted mapping for port " + port);
 		} catch (IOException | SAXException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/plugin/tcp/TcpPlugin.java

@@ -37,6 +37,7 @@ import javax.annotation.Nullable;
 
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.PrivacyUtils.scrubSocketAddress;
 
 @MethodsNotNullByDefault
@@ -152,7 +153,7 @@ abstract class TcpPlugin implements DuplexPlugin {
 		try {
 			if (ss != null) ss.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		} finally {
 			callback.transportDisabled();
 		}
@@ -306,7 +307,7 @@ abstract class TcpPlugin implements DuplexPlugin {
 		try {
 			ifaces = Collections.list(NetworkInterface.getNetworkInterfaces());
 		} catch (SocketException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return Collections.emptyList();
 		}
 		List<InetAddress> addrs = new ArrayList<>();

bramble-core/src/main/java/org/briarproject/bramble/reliability/ReliabilityLayerImpl.java

@@ -16,6 +16,7 @@ import java.util.logging.Logger;
 
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -78,7 +79,7 @@ class ReliabilityLayerImpl implements ReliabilityLayer, WriteHandler {
 				Thread.currentThread().interrupt();
 				running = false;
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				running = false;
 			}
 		});

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

@@ -32,6 +32,7 @@ import javax.inject.Inject;
 import javax.net.SocketFactory;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @Immutable
 @NotNullByDefault
@@ -132,7 +133,7 @@ class DevReporterImpl implements DevReporter, EventListener {
 		try {
 			if (c != null) c.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -140,7 +141,7 @@ class DevReporterImpl implements DevReporter, EventListener {
 		try {
 			if (s != null) s.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 }

bramble-core/src/main/java/org/briarproject/bramble/sync/DuplexOutgoingSession.java

@@ -42,6 +42,7 @@ import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.STOPPING;
 import static org.briarproject.bramble.api.record.Record.MAX_RECORD_PAYLOAD_BYTES;
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_IDS;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 /**
  * An outgoing {@link SyncSession} suitable for duplex transports. The session
@@ -240,7 +241,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 					LOG.info("Generated ack: " + (a != null));
 				if (a != null) writerTasks.add(new WriteAck(a));
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}
@@ -287,7 +288,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 					LOG.info("Generated batch: " + (b != null));
 				if (b != null) writerTasks.add(new WriteBatch(b));
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}
@@ -334,7 +335,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 					LOG.info("Generated offer: " + (o != null));
 				if (o != null) writerTasks.add(new WriteOffer(o));
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}
@@ -379,7 +380,7 @@ class DuplexOutgoingSession implements SyncSession, EventListener {
 					LOG.info("Generated request: " + (r != null));
 				if (r != null) writerTasks.add(new WriteRequest(r));
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}

bramble-core/src/main/java/org/briarproject/bramble/sync/IncomingSession.java

@@ -28,6 +28,7 @@ import javax.annotation.concurrent.ThreadSafe;
 
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.STOPPING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 /**
  * An incoming {@link SyncSession}.
@@ -127,7 +128,7 @@ class IncomingSession implements SyncSession, EventListener {
 					db.endTransaction(txn);
 				}
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}
@@ -153,7 +154,7 @@ class IncomingSession implements SyncSession, EventListener {
 					db.endTransaction(txn);
 				}
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}
@@ -179,7 +180,7 @@ class IncomingSession implements SyncSession, EventListener {
 					db.endTransaction(txn);
 				}
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}
@@ -205,7 +206,7 @@ class IncomingSession implements SyncSession, EventListener {
 					db.endTransaction(txn);
 				}
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}

bramble-core/src/main/java/org/briarproject/bramble/sync/SimplexOutgoingSession.java

@@ -32,6 +32,7 @@ import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.LifecycleState.STOPPING;
 import static org.briarproject.bramble.api.record.Record.MAX_RECORD_PAYLOAD_BYTES;
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_MESSAGE_IDS;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 /**
  * An outgoing {@link SyncSession} suitable for simplex transports. The session
@@ -139,7 +140,7 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 				if (a == null) decrementOutstandingQueries();
 				else writerTasks.add(new WriteAck(a));
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}
@@ -184,7 +185,7 @@ class SimplexOutgoingSession implements SyncSession, EventListener {
 				if (b == null) decrementOutstandingQueries();
 				else writerTasks.add(new WriteBatch(b));
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				interrupt();
 			}
 		}

bramble-core/src/main/java/org/briarproject/bramble/sync/ValidationManagerImpl.java

@@ -40,6 +40,7 @@ import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.sync.ValidationManager.State.DELIVERED;
 import static org.briarproject.bramble.api.sync.ValidationManager.State.INVALID;
 import static org.briarproject.bramble.api.sync.ValidationManager.State.PENDING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @ThreadSafe
 @NotNullByDefault
@@ -110,7 +111,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			}
 			validateNextMessageAsync(unvalidated);
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -144,7 +145,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			LOG.info("Group removed before validation");
 			validateNextMessageAsync(unvalidated);
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -165,7 +166,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			}
 			deliverNextPendingMessageAsync(pending);
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -231,7 +232,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			LOG.info("Group removed before delivery");
 			deliverNextPendingMessageAsync(pending);
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -252,8 +253,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 				storeMessageContextAsync(m, g.getClientId(),
 						g.getMajorVersion(), context);
 			} catch (InvalidMessageException e) {
-				if (LOG.isLoggable(INFO))
-					LOG.log(INFO, e.toString(), e);
+				logException(LOG, INFO, e);
 				Queue<MessageId> invalidate = new LinkedList<>();
 				invalidate.add(m.getId());
 				invalidateNextMessageAsync(invalidate);
@@ -326,7 +326,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 		} catch (NoSuchGroupException e) {
 			LOG.info("Group removed during validation");
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -377,7 +377,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			}
 			shareNextMessageAsync(toShare);
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -412,7 +412,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			LOG.info("Group removed before sharing");
 			shareNextMessageAsync(toShare);
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -440,7 +440,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 			LOG.info("Message removed before invalidation");
 			invalidateNextMessageAsync(invalidate);
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -492,7 +492,7 @@ class ValidationManagerImpl implements ValidationManager, Service,
 		} catch (NoSuchGroupException e) {
 			LOG.info("Group removed before validation");
 		} catch (DbException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/system/LinuxSecureRandomProvider.java

@@ -13,6 +13,7 @@ import java.util.logging.Logger;
 import javax.annotation.concurrent.Immutable;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @Immutable
 @NotNullByDefault
@@ -49,7 +50,7 @@ class LinuxSecureRandomProvider extends AbstractSecureRandomProvider {
 			out.close();
 		} catch (IOException e) {
 			// On some devices /dev/urandom isn't writable - this isn't fatal
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/system/LinuxSecureRandomSpi.java

@@ -10,6 +10,7 @@ import java.security.SecureRandomSpi;
 import java.util.logging.Logger;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 public class LinuxSecureRandomSpi extends SecureRandomSpi {
 
@@ -39,7 +40,7 @@ public class LinuxSecureRandomSpi extends SecureRandomSpi {
 			out.close();
 		} catch (IOException e) {
 			// On some devices /dev/urandom isn't writable - this isn't fatal
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 

bramble-core/src/main/java/org/briarproject/bramble/transport/TransportKeyManagerImpl.java

@@ -36,6 +36,7 @@ import static org.briarproject.bramble.api.transport.TransportConstants.MAX_CLOC
 import static org.briarproject.bramble.api.transport.TransportConstants.PROTOCOL_VERSION;
 import static org.briarproject.bramble.api.transport.TransportConstants.TAG_LENGTH;
 import static org.briarproject.bramble.util.ByteUtils.MAX_32_BIT_UNSIGNED;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @ThreadSafe
 @NotNullByDefault
@@ -169,7 +170,7 @@ class TransportKeyManagerImpl implements TransportKeyManager {
 					db.endTransaction(txn);
 				}
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}

bramble-j2se/src/main/java/org/briarproject/bramble/lifecycle/WindowsShutdownManagerImpl.java

@@ -28,6 +28,7 @@ import javax.annotation.concurrent.ThreadSafe;
 import static com.sun.jna.Library.OPTION_FUNCTION_MAPPER;
 import static com.sun.jna.Library.OPTION_TYPE_MAPPER;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @ThreadSafe
 @NotNullByDefault
@@ -141,7 +142,7 @@ class WindowsShutdownManagerImpl extends ShutdownManagerImpl {
 					user32.DispatchMessage(msg);
 				}
 			} catch (UnsatisfiedLinkError e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 	}

bramble-j2se/src/main/java/org/briarproject/bramble/plugin/bluetooth/JavaBluetoothPlugin.java

@@ -19,6 +19,7 @@ import javax.microedition.io.StreamConnection;
 import javax.microedition.io.StreamConnectionNotifier;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.bramble.util.StringUtils.isValidMac;
 
 @MethodsNotNullByDefault
@@ -85,7 +86,7 @@ class JavaBluetoothPlugin extends BluetoothPlugin<StreamConnectionNotifier> {
 		try {
 			if (ss != null) ss.close();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 

bramble-j2se/src/main/java/org/briarproject/bramble/plugin/modem/ModemImpl.java

@@ -27,6 +27,7 @@ import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static jssc.SerialPort.PURGE_RXCLEAR;
 import static jssc.SerialPort.PURGE_TXCLEAR;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -136,7 +137,7 @@ class ModemImpl implements Modem, WriteHandler, SerialPortEventListener {
 		try {
 			if (port != null) port.closePort();
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -327,7 +328,7 @@ class ModemImpl implements Modem, WriteHandler, SerialPortEventListener {
 				}
 			}
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 
@@ -394,8 +395,7 @@ class ModemImpl implements Modem, WriteHandler, SerialPortEventListener {
 						try {
 							answer();
 						} catch (IOException e) {
-							if (LOG.isLoggable(WARNING))
-								LOG.log(WARNING, e.toString(), e);
+							logException(LOG, WARNING, e);
 						}
 					});
 				}

bramble-j2se/src/main/java/org/briarproject/bramble/plugin/modem/ModemPlugin.java

@@ -23,6 +23,7 @@ import java.util.logging.Logger;
 
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -81,7 +82,7 @@ class ModemPlugin implements DuplexPlugin, Modem.Callback {
 				running = true;
 				return;
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 		throw new PluginException();
@@ -94,7 +95,7 @@ class ModemPlugin implements DuplexPlugin, Modem.Callback {
 			try {
 				modem.stop();
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 	}
@@ -131,7 +132,7 @@ class ModemPlugin implements DuplexPlugin, Modem.Callback {
 					LOG.info("Initialised modem on " + portName);
 				return true;
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		}
 		running = false;
@@ -157,7 +158,7 @@ class ModemPlugin implements DuplexPlugin, Modem.Callback {
 		try {
 			if (!modem.dial(number)) return null;
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			resetModem();
 			return null;
 		}
@@ -209,7 +210,7 @@ class ModemPlugin implements DuplexPlugin, Modem.Callback {
 			try {
 				modem.hangUp();
 			} catch (IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				exception = true;
 			}
 			if (exception) resetModem();

briar-android/.gitignore

@@ -4,3 +4,4 @@ build
 local.properties
 .settings
 src/main/assets/*.zip
+src/main/res/values-iw

briar-android/artwork/notification_ongoing.svg

@@ -0,0 +1,58 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Generator: Adobe Illustrator 19.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   version="1.1"
+   id="Ebene_1"
+   x="0px"
+   y="0px"
+   viewBox="0 0 24 24"
+   xml:space="preserve"
+   inkscape:version="0.92.3 (2405546, 2018-03-11)"
+   sodipodi:docname="notification_ongoing.svg"
+   width="24"
+   height="24"><metadata
+     id="metadata61"><rdf:RDF><cc:Work
+         rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" /><dc:title /></cc:Work></rdf:RDF></metadata><defs
+     id="defs59" /><sodipodi:namedview
+     pagecolor="#000000"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="1920"
+     inkscape:window-height="1020"
+     id="namedview57"
+     showgrid="false"
+     inkscape:zoom="11.466748"
+     inkscape:cx="-4.790356"
+     inkscape:cy="17.536496"
+     inkscape:window-x="1442"
+     inkscape:window-y="24"
+     inkscape:window-maximized="0"
+     inkscape:current-layer="Ebene_1"
+     units="px" /><style
+     type="text/css"
+     id="style3">
+	.st0{fill:#FFFFFF;}
+	.st1{display:none;fill:#87C214;}
+	.st2{fill:#87C214;}
+	.st3{display:none;fill:#FFFFFF;}
+	.st4{fill:#95D220;}
+	.st5{display:none;fill:#95D220;}
+</style><path
+     style="fill:#ffffff;stroke-width:0.07272727"
+     d="M 12,0 A 12,12 0 0 0 0,12 12,12 0 0 0 12,24 12,12 0 0 0 24,12 12,12 0 0 0 12,0 Z M 8.1454545,3.4764204 h 0.6036931 c 0.7054546,0 1.2872164,0.5817614 1.2872164,1.287216 V 6.4 H 6.8582386 V 4.7636364 c 0,-0.7054546 0.5817614,-1.287216 1.2872159,-1.287216 z m 7.0545455,0 h 0.603693 c 0.712727,0 1.287216,0.5817614 1.287216,1.287216 V 13.454545 H 13.912784 V 4.7636364 c 0,-0.7054546 0.581761,-1.287216 1.287216,-1.287216 z M 4.7127841,6.9090909 H 13.403693 V 10.087216 H 4.7127841 c -0.7127273,0 -1.287358,-0.5817618 -1.287358,-1.2872156 V 8.1963069 c 0,-0.7127273 0.5819034,-1.287216 1.287358,-1.287216 z m 12.8872159,0 h 1.636364 c 0.705454,0 1.279943,0.5817615 1.287216,1.287216 v 0.6036935 c 0,0.7127269 -0.581762,1.2872156 -1.287216,1.2872156 H 17.6 Z M 6.8582386,10.596307 h 3.1781254 v 8.690909 c 0,0.705454 -0.5817618,1.287358 -1.2872164,1.287358 H 8.1454545 c -0.7127272,0 -1.2872159,-0.581904 -1.2872159,-1.287358 z m -2.1454545,3.367329 h 1.6363636 v 3.178125 H 4.7127841 c -0.7127273,0 -1.287358,-0.581761 -1.287358,-1.287216 v -0.603693 c 0,-0.712727 0.5819034,-1.287216 1.287358,-1.287216 z m 5.8326709,0 h 8.690909 c 0.705454,0 1.279943,0.581761 1.287216,1.287216 v 0.603693 c 0,0.705455 -0.581762,1.287216 -1.287216,1.287216 h -8.690909 z m 3.367329,3.687216 h 3.178125 v 1.636364 c 0,0.705454 -0.581761,1.287358 -1.287216,1.287358 H 15.2 c -0.705455,0 -1.287216,-0.581904 -1.287216,-1.287358 z"
+     id="circle7"
+     inkscape:connector-curvature="0" /></svg>

briar-android/artwork/notification_reminder.svg

@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Generator: Adobe Illustrator 19.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   version="1.1"
+   id="Ebene_1"
+   x="0px"
+   y="0px"
+   viewBox="0 0 24 24"
+   xml:space="preserve"
+   inkscape:version="0.92.3 (2405546, 2018-03-11)"
+   sodipodi:docname="notification_reminder.svg"
+   width="24"
+   height="24"><metadata
+     id="metadata61"><rdf:RDF><cc:Work
+         rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" /><dc:title /></cc:Work></rdf:RDF></metadata><defs
+     id="defs59" /><sodipodi:namedview
+     pagecolor="#000000"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="1920"
+     inkscape:window-height="1020"
+     id="namedview57"
+     showgrid="false"
+     inkscape:zoom="32.43286"
+     inkscape:cx="6.4172501"
+     inkscape:cy="12.231457"
+     inkscape:window-x="1442"
+     inkscape:window-y="24"
+     inkscape:window-maximized="0"
+     inkscape:current-layer="Ebene_1"
+     units="px" /><style
+     type="text/css"
+     id="style3">
+	.st0{fill:#FFFFFF;}
+	.st1{display:none;fill:#87C214;}
+	.st2{fill:#87C214;}
+	.st3{display:none;fill:#FFFFFF;}
+	.st4{fill:#95D220;}
+	.st5{display:none;fill:#95D220;}
+</style><path
+     style="display:inline;fill:#ffffff;stroke-width:0.07272727"
+     d="M 12 0 A 12 12 0 0 0 4.875 2.3613281 L 6.9316406 4.4160156 C 7.0875805 3.8805807 7.5639651 3.4765625 8.1464844 3.4765625 L 8.7480469 3.4765625 C 9.4535014 3.4765625 10.035156 4.0582174 10.035156 4.7636719 L 10.035156 6.4003906 L 8.9140625 6.4003906 L 9.4238281 6.9101562 L 13.404297 6.9101562 L 13.404297 10.085938 L 12.601562 10.085938 L 13.914062 11.398438 L 13.914062 4.7636719 C 13.914062 4.0582174 14.495717 3.4765625 15.201172 3.4765625 L 15.802734 3.4765625 C 16.515461 3.4765625 17.089844 4.0582174 17.089844 4.7636719 L 17.089844 13.455078 L 15.96875 13.455078 L 16.478516 13.964844 L 19.236328 13.964844 C 19.941782 13.964844 20.516165 14.546498 20.523438 15.251953 L 20.523438 15.853516 C 20.523438 16.436036 20.119418 16.91242 19.583984 17.068359 L 21.638672 19.125 A 12 12 0 0 0 24 12 A 12 12 0 0 0 12 0 z M 1.2617188 1.3632812 L 0 2.6269531 L 2.3125 4.9472656 A 12 12 0 0 0 0 12 A 12 12 0 0 0 12 24 A 12 12 0 0 0 19.027344 21.707031 L 21.314453 24 L 22.576172 22.734375 L 2.7519531 2.8554688 L 1.9863281 2.0898438 L 1.2617188 1.3632812 z M 17.599609 6.9101562 L 19.236328 6.9101562 C 19.941782 6.9101562 20.516165 7.4918111 20.523438 8.1972656 L 20.523438 8.7988281 C 20.523438 9.511555 19.941782 10.085937 19.236328 10.085938 L 17.599609 10.085938 L 17.599609 6.9101562 z M 4.359375 6.9980469 L 7.4394531 10.085938 L 4.7128906 10.085938 C 4.0001632 10.085938 3.4257813 9.504282 3.4257812 8.7988281 L 3.4257812 8.1972656 C 3.4257812 7.6133228 3.8294199 7.1540656 4.359375 6.9980469 z M 6.859375 10.595703 L 7.9472656 10.595703 L 10.035156 12.689453 L 10.035156 19.287109 C 10.035156 19.992562 9.4535014 20.574219 8.7480469 20.574219 L 8.1464844 20.574219 C 7.4337573 20.574219 6.859375 19.992563 6.859375 19.287109 L 6.859375 10.595703 z M 4.7128906 13.964844 L 6.3496094 13.964844 L 6.3496094 17.140625 L 4.7128906 17.140625 C 4.0001632 17.140625 3.4257813 16.558971 3.4257812 15.853516 L 3.4257812 15.251953 C 3.4257812 14.539226 4.007436 13.964844 4.7128906 13.964844 z M 10.544922 13.964844 L 11.306641 13.964844 L 14.474609 17.140625 L 10.544922 17.140625 L 10.544922 13.964844 z M 13.914062 17.650391 L 14.982422 17.650391 L 16.992188 19.666016 C 16.827053 20.182975 16.371277 20.574219 15.802734 20.574219 L 15.201172 20.574219 C 14.495717 20.574219 13.914063 19.992563 13.914062 19.287109 L 13.914062 17.650391 z "
+     id="circle7" /></svg>

briar-android/build.gradle

@@ -22,7 +22,7 @@ dependencies {
 	implementation "com.android.support:support-annotations:$supportVersion"
 	implementation 'com.android.support.constraint:constraint-layout:1.1.0'
 
-	implementation('ch.acra:acra:4.8.5') {
+	implementation('ch.acra:acra:4.9.1') {
 		exclude module: 'support-v4'
 		exclude module: 'support-annotations'
 	}
@@ -61,7 +61,7 @@ dependencyVerification {
 			'android.arch.lifecycle:viewmodel:1.1.0:viewmodel-1.1.0.aar:6407c93a5ea9850661dca42a0068d6f3deccefd7228ee69bae1c35d70cbc2557',
 			'backport-util-concurrent:backport-util-concurrent:3.1:backport-util-concurrent-3.1.jar:f5759b7fcdfc83a525a036deedcbd32e5b536b625ebc282426f16ca137eb5902',
 			'cglib:cglib:3.2.0:cglib-3.2.0.jar:adb13bab79712ad6bdf1bd59f2a3918018a8016e722e8a357065afb9e6690861',
-			'ch.acra:acra:4.8.5:acra-4.8.5.aar:afd5b28934d5166b55f261c85685ad59e8a4ebe9ca1960906afaa8c76d8dc9eb',
+			'ch.acra:acra:4.9.1:acra-4.9.1.aar:d2762968c448757a7d6acc9f141881d9632f664988e9723ece33b5f7c79f3bc9',
 			'classworlds:classworlds:1.1-alpha-2:classworlds-1.1-alpha-2.jar:2bf4e59f3acd106fea6145a9a88fe8956509f8b9c0fdd11eb96fee757269e3f3',
 			'com.almworks.sqlite4java:sqlite4java:0.282:sqlite4java-0.282.jar:9e1d8dd83ca6003f841e3af878ce2dc7c22497493a7bb6d1b62ec1b0d0a83c05',
 			'com.android.support.constraint:constraint-layout-solver:1.1.0:constraint-layout-solver-1.1.0.jar:fcb4c7d705754ca3d69b1b2c3caf445a425599fda8caabbcf855d98ea0663e4e',
@@ -82,32 +82,32 @@ dependencyVerification {
 			'com.android.support:support-v4:27.1.1:support-v4-27.1.1.aar:4f41dfc3e89f2738e45c86264a85c0934d055ee8ebe2020e23c97f303b80a48b',
 			'com.android.support:support-vector-drawable:27.1.1:support-vector-drawable-27.1.1.aar:1c0f421114cf4627cf208776d6eb4f76340c78b7e96fe6e12b3e6eb950caf1b9',
 			'com.android.support:transition:27.1.1:transition-27.1.1.aar:c0765b2f3c78696567ec5b3f519d22da1e3df11ac994625adf4bb4dc571caacc',
-			'com.android.tools.analytics-library:protos:26.1.2:protos-26.1.2.jar:52672a0b42b572a06aecc3535d5068eb46c0e15d129b9f1085d3c16a1da5cdbb',
-			'com.android.tools.analytics-library:shared:26.1.2:shared-26.1.2.jar:5c7e0eda18c6f87feeb83628c707e8aaa3298b41fb72e38efe31ad1675f9e8e9',
-			'com.android.tools.analytics-library:tracker:26.1.2:tracker-26.1.2.jar:06f97aa0adf44ffb06f8681c6a79d9be153a08f61d21eddc42b8d3db96df4282',
-			'com.android.tools.build:apksig:3.1.2:apksig-3.1.2.jar:40696a4559124d1d57873d208857eee059d48859239d569c7d18374ac644a8be',
-			'com.android.tools.build:builder-model:3.1.2:builder-model-3.1.2.jar:d49bfa2a135c9562b6ca7aa4342036cfa1582c7074c2d1d93d1dae8b3a134e17',
-			'com.android.tools.build:builder-test-api:3.1.2:builder-test-api-3.1.2.jar:dfe2a50b740d41b11189101062434d4283d18647e89a492ad51710c719363e9f',
-			'com.android.tools.build:builder:3.1.2:builder-3.1.2.jar:b60f825a42e2efe8433619fbc759f3d9effecab718279048d36881188ceb1d14',
-			'com.android.tools.build:gradle-api:3.1.2:gradle-api-3.1.2.jar:e58bcc5b893e4583ab0f5c8ef89c4dbcce202b405a9d7fcc116d21e5357d4893',
-			'com.android.tools.build:manifest-merger:26.1.2:manifest-merger-26.1.2.jar:9c61c27ea5266573107b954acf1216d398f4d7e7ae6fad6409d6b2b767eb091c',
-			'com.android.tools.ddms:ddmlib:26.1.2:ddmlib-26.1.2.jar:18a2a5fbef36882f07d03c2b9e59eba05cf8248177bf5cbff736e4b582804c44',
-			'com.android.tools.external.com-intellij:intellij-core:26.1.2:intellij-core-26.1.2.jar:37c5acf279f1ae3e85b1a5be3c9f15f43bde7b08f978eefefffb9c4035760c52',
-			'com.android.tools.external.com-intellij:kotlin-compiler:26.1.2:kotlin-compiler-26.1.2.jar:152df0bee7580326c77316b669a9d96e3b09efb1d45f545dce4147271b0b8944',
-			'com.android.tools.external.org-jetbrains:uast:26.1.2:uast-26.1.2.jar:02d39582206d3f5fc0a6cb18bfd9e8b9f9c1acb805ec6dac08b4e3a56849d279',
-			'com.android.tools.layoutlib:layoutlib-api:26.1.2:layoutlib-api-26.1.2.jar:20220039fcc7d799f928153beff862e704457c0f55ab44258f3745ebeb662b4f',
-			'com.android.tools.lint:lint-api:26.1.2:lint-api-26.1.2.jar:e1d5b62b870a7c566e9877a6b96b27784a4d713f8caa07fdcb4705d47a40a1d9',
-			'com.android.tools.lint:lint-checks:26.1.2:lint-checks-26.1.2.jar:211e2afd58504372385d71b1e5be982c2b5121ab6fee1c04ddabeb75a8729e07',
-			'com.android.tools.lint:lint-gradle-api:26.1.2:lint-gradle-api-26.1.2.jar:71284f2a8b03c3e55c94511c9eb36f8184fbb85324325fc6b78abf5183f03d90',
-			'com.android.tools.lint:lint-gradle:26.1.2:lint-gradle-26.1.2.jar:855f0c82b7fc690df1b7319c0774f7517f7f8f5dd4eee1f6077dcf50e07c6240',
-			'com.android.tools.lint:lint-kotlin:26.1.2:lint-kotlin-26.1.2.jar:1e591f70bcbbc11569720a9bbcca2bc1f3d4f789f01f40f642848d920643d484',
-			'com.android.tools.lint:lint:26.1.2:lint-26.1.2.jar:93736c62e9f1976998c2b4aa716aea0734cdb162d05502f4af7292654aedb182',
-			'com.android.tools:annotations:26.1.2:annotations-26.1.2.jar:72773dcaf5c4ccca828e3c8467f1b78a8a00b3cc5f8ad1aab88fcf9379928018',
-			'com.android.tools:common:26.1.2:common-26.1.2.jar:ea4320f0c17dcbc4491896bb705c4d25ec08bd62ef02ab0579fe154e75e788e6',
-			'com.android.tools:dvlib:26.1.2:dvlib-26.1.2.jar:1187aa4fb666595c96c4deb6bc0e0f4b7e396bde9f6243330b49a232946130ea',
-			'com.android.tools:repository:26.1.2:repository-26.1.2.jar:8b86e512ad6d32bd76989451eefe2b271f5efce6d4d65ecb173afaf14606e01a',
-			'com.android.tools:sdk-common:26.1.2:sdk-common-26.1.2.jar:23584720a60a21cdcb5b1ec10269e3013789d6805d153cc696c39ec7ce251896',
-			'com.android.tools:sdklib:26.1.2:sdklib-26.1.2.jar:d3870fafc59ab8efa70d3f9649f40ee299c8ec5b58377b06e8853d7272a5bf4e',
+			'com.android.tools.analytics-library:protos:26.1.3:protos-26.1.3.jar:818c9f256f141d9dafec03a1aa2b94d240b2c140acfd7ee31a8b3e6c2b9479e3',
+			'com.android.tools.analytics-library:shared:26.1.3:shared-26.1.3.jar:7110706c7ada96c8b6f5ca80c478291bc7899d46277de2c48527e045442401a3',
+			'com.android.tools.analytics-library:tracker:26.1.3:tracker-26.1.3.jar:4155424bf2ce4872da83332579a1707252bc66cbd77c5144fdc4483d0f2e1418',
+			'com.android.tools.build:apksig:3.1.3:apksig-3.1.3.jar:7e1f8e675a6e768e5b56405e41d6c3cc05befe62e601b04177de1029902c9c89',
+			'com.android.tools.build:builder-model:3.1.3:builder-model-3.1.3.jar:06ad1c422d679fc698451479cb40ba863849d67bfd1de23f6d2c16d78b024b0b',
+			'com.android.tools.build:builder-test-api:3.1.3:builder-test-api-3.1.3.jar:4d989f780436794f0f8b2f50e9e079b786571eac90f26c208ab2ae6d4012f389',
+			'com.android.tools.build:builder:3.1.3:builder-3.1.3.jar:8a1092012c89d0ec1ee2eff09c5708c71ef4482a6862df8d3a44a67fccace01c',
+			'com.android.tools.build:gradle-api:3.1.3:gradle-api-3.1.3.jar:01e4df521456aef66514336f1d492346730dd1fb8f6433a89f62da834941ed72',
+			'com.android.tools.build:manifest-merger:26.1.3:manifest-merger-26.1.3.jar:1e4fc7e932adb4607082409800e5e6fccb42e6c5360ae5990094bf522f3ada55',
+			'com.android.tools.ddms:ddmlib:26.1.3:ddmlib-26.1.3.jar:c54931cd68df5d1ea2923b3b320eae47cd2307a5a916bb8674c0acf93cd1d3cd',
+			'com.android.tools.external.com-intellij:intellij-core:26.1.3:intellij-core-26.1.3.jar:af67f5535fef2e1a28b1007a4acb8c5deb6a1e33b8afe7b11d012c9e778ebcec',
+			'com.android.tools.external.com-intellij:kotlin-compiler:26.1.3:kotlin-compiler-26.1.3.jar:c746d2859dc11cc05c84b692b3498d3a621e0929511f8440ee009c6557838fd4',
+			'com.android.tools.external.org-jetbrains:uast:26.1.3:uast-26.1.3.jar:3f3f6651d0c7685a77ecb22e9c82d6b49fdf24322c17360768dc530678f43265',
+			'com.android.tools.layoutlib:layoutlib-api:26.1.3:layoutlib-api-26.1.3.jar:10bc73ce706c45629872d6a999dbe12116df64e24f47ff93b7b13121ff57b4b0',
+			'com.android.tools.lint:lint-api:26.1.3:lint-api-26.1.3.jar:6f97323f9af8deda86278717885b5c927f3766757db89709f52d11d42b6fb751',
+			'com.android.tools.lint:lint-checks:26.1.3:lint-checks-26.1.3.jar:73c3d53784c9ce3e6d5968506581918e0179645d20809927ca4a001dd766b001',
+			'com.android.tools.lint:lint-gradle-api:26.1.3:lint-gradle-api-26.1.3.jar:7ca3c4866ec21dc21d53a9d86f752b77ace6f6c610a0c9dc877313856c733d9d',
+			'com.android.tools.lint:lint-gradle:26.1.3:lint-gradle-26.1.3.jar:db0c354b8f4b6f6637e31f91c564785a59ff896325331fcbc3de7458e0b6c067',
+			'com.android.tools.lint:lint-kotlin:26.1.3:lint-kotlin-26.1.3.jar:94e2b0f4565a241561cfb8fc1222bb3f132a3b98d2a90421dbb72ee8358e7d68',
+			'com.android.tools.lint:lint:26.1.3:lint-26.1.3.jar:8d5f32c989c6d191d712e90ad3ca2d1c409313599551d04d834caa44d26c78df',
+			'com.android.tools:annotations:26.1.3:annotations-26.1.3.jar:c950430b24ac5d58fc97e7283b8f0115f99587e76e08b4e1e2aaa780f2d77323',
+			'com.android.tools:common:26.1.3:common-26.1.3.jar:7c31a90581a148ab219f615a59667f0dded7fa39b248529784474da3c2274ef2',
+			'com.android.tools:dvlib:26.1.3:dvlib-26.1.3.jar:0cae87906f53d3f1088366a916ed180a7312b6d9919b90797f238875c8492855',
+			'com.android.tools:repository:26.1.3:repository-26.1.3.jar:52d4539cc68db91b261e2a33b2c8206b26e05539078758dc28cfb3854adb4f59',
+			'com.android.tools:sdk-common:26.1.3:sdk-common-26.1.3.jar:1948603ca9ff22c7ebb3178000bffa3a9dd2ca1cc5cb0c793cae08468b8fcfc1',
+			'com.android.tools:sdklib:26.1.3:sdklib-26.1.3.jar:4adcfaad9514607098d2c51503c39811112d3050f4d1e744c01c7f08f591032b',
 			'com.github.bumptech.glide:glide:3.8.0:glide-3.8.0.jar:750d9e7b940dc0ee48f8680623b55d46e14e8727acc922d7b156e57e7c549655',
 			'com.google.android.apps.common.testing.accessibility.framework:accessibility-test-framework:2.1:accessibility-test-framework-2.1.jar:7b0aa6ed7553597ce0610684a9f7eca8021eee218f2e2f427c04a7fbf5f920bd',
 			'com.google.code.findbugs:jsr305:1.3.9:jsr305-1.3.9.jar:905721a0eea90a81534abb7ee6ef4ea2e5e645fa1def0a5cd88402df1b46c9ed',
@@ -238,15 +238,16 @@ android {
 	defaultConfig {
 		minSdkVersion 14
 		targetSdkVersion 26
-		versionCode 10006
-		versionName "1.0.6"
+		versionCode 10011
+		versionName "1.0.11"
 		applicationId "org.briarproject.briar.android"
 		resValue "string", "app_package", "org.briarproject.briar.android"
 		resValue "string", "app_name", "Briar"
 		buildConfigField "String", "GitHash",
 				"\"${getStdout(['git', 'rev-parse', '--short=7', 'HEAD'], 'No commit hash')}\""
+		def now = (long) (System.currentTimeMillis() / 1000)
 		buildConfigField "Long", "BuildTimestamp",
-				"${getStdout(['git', 'log', '-n', '1', '--format=%ct'], 0)}000L"
+				"${getStdout(['git', 'log', '-n', '1', '--format=%ct'], now)}000L"
 	}
 
 	buildTypes {
@@ -284,3 +285,46 @@ android {
 		warning 'ExtraTranslation'
 	}
 }
+
+task verifyTranslations {
+	doLast {
+		def file = project.file("src/main/res/values/arrays.xml")
+		def arrays = new XmlParser().parse(file)
+		def lc = arrays.children().find { it.@name == "pref_language_values" }
+		def translations = []
+		lc.children().each { value -> translations.add(value.text()) }
+
+		def folders = ["default", "en-US"]
+		project.file("src/main/res").eachDir { dir ->
+			if (dir.name.startsWith("values-") && !dir.name.endsWith("night")) {
+				folders.add(dir.name.substring(7).replace("-r", "-"))
+			}
+		}
+		folders.each { n ->
+			if (!translations.remove(n) && n != 'iw') {
+				throw new GradleException("Translation " + n + " is missing in $file")
+			}
+		}
+		if (translations.size() != 0)
+			throw new GradleException("Translations\n" + translations.join("\n")
+					+ "\nhave no matching value folder")
+
+		// Some devices use iw instead of he for hebrew
+		def hebrew_legacy = project.file("src/main/res/values-iw")
+		def hebrew = project.file("src/main/res/values-he")
+		// Copy values-he to values-iw
+		if (hebrew.exists()) {
+			hebrew_legacy.mkdir()
+			copy {
+				from hebrew.getAbsolutePath()
+				into hebrew_legacy.getAbsolutePath()
+			}
+		}
+	}
+}
+
+project.afterEvaluate {
+	preBuild.dependsOn.add(verifyTranslations)
+}
+
+

briar-android/src/main/AndroidManifest.xml

@@ -14,6 +14,7 @@
 	<uses-permission android:name="android.permission.INTERNET" />
 	<uses-permission android:name="android.permission.VIBRATE" />
 	<uses-permission android:name="android.permission.WAKE_LOCK" />
+	<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
 	<uses-permission-sdk-23 android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS"/>
 
 	<application
@@ -24,6 +25,14 @@
 		android:logo="@mipmap/ic_launcher_round"
 		android:theme="@style/BriarTheme">
 
+		<receiver
+			android:name="org.briarproject.briar.android.BootReceiver"
+			android:exported="false">
+			<intent-filter>
+				<action android:name="android.intent.action.BOOT_COMPLETED"/>
+			</intent-filter>
+		</receiver>
+
 		<service
 			android:name="org.briarproject.briar.android.BriarService"
 			android:exported="false">
@@ -44,7 +53,6 @@
 			android:finishOnTaskLaunch="true"
 			android:label="@string/crash_report_title"
 			android:launchMode="singleInstance"
-			android:process=":briar_error_handler"
 			android:theme="@style/BriarTheme.NoActionBar"
 			android:windowSoftInputMode="stateHidden">
 		</activity>
@@ -301,7 +309,7 @@
 		</activity>
 
 		<activity
-			android:name="org.briarproject.briar.android.keyagreement.KeyAgreementActivity"
+			android:name="org.briarproject.briar.android.keyagreement.ContactExchangeActivity"
 			android:label="@string/add_contact_title"
 			android:theme="@style/BriarTheme.NoActionBar"
 			android:parentActivityName="org.briarproject.briar.android.navdrawer.NavDrawerActivity">

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

@@ -150,6 +150,8 @@ public interface AndroidComponent
 	@IoExecutor
 	Executor ioExecutor();
 
+	void inject(BootReceiver briarService);
+
 	void inject(BriarService briarService);
 
 	void inject(BriarReportSender briarReportSender);

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

@@ -70,6 +70,7 @@ import static android.os.Build.VERSION.SDK_INT;
 import static android.support.v4.app.NotificationCompat.CATEGORY_MESSAGE;
 import static android.support.v4.app.NotificationCompat.CATEGORY_SOCIAL;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 import static org.briarproject.briar.android.contact.ConversationActivity.CONTACT_ID;
 import static org.briarproject.briar.android.navdrawer.NavDrawerActivity.INTENT_BLOGS;
@@ -84,13 +85,6 @@ import static org.briarproject.briar.android.settings.SettingsFragment.SETTINGS_
 class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 		Service, EventListener {
 
-	// Notification IDs
-	private static final int PRIVATE_MESSAGE_NOTIFICATION_ID = 3;
-	private static final int GROUP_MESSAGE_NOTIFICATION_ID = 4;
-	private static final int FORUM_POST_NOTIFICATION_ID = 5;
-	private static final int BLOG_POST_NOTIFICATION_ID = 6;
-	private static final int INTRODUCTION_SUCCESS_NOTIFICATION_ID = 7;
-
 	private static final long SOUND_DELAY = TimeUnit.SECONDS.toMillis(2);
 
 	private static final Logger LOG =
@@ -265,8 +259,7 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 			try {
 				settings = settingsManager.getSettings(SETTINGS_NAMESPACE);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING))
-					LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}

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

@@ -20,6 +20,7 @@ import org.briarproject.bramble.api.plugin.duplex.DuplexPluginFactory;
 import org.briarproject.bramble.api.plugin.simplex.SimplexPluginFactory;
 import org.briarproject.bramble.api.reporting.DevConfig;
 import org.briarproject.bramble.api.system.AndroidExecutor;
+import org.briarproject.bramble.api.system.Clock;
 import org.briarproject.bramble.api.system.LocationUtils;
 import org.briarproject.bramble.api.system.Scheduler;
 import org.briarproject.bramble.plugin.bluetooth.AndroidBluetoothPluginFactory;
@@ -97,14 +98,15 @@ public class AppModule {
 			@Scheduler ScheduledExecutorService scheduler,
 			AndroidExecutor androidExecutor, SecureRandom random,
 			SocketFactory torSocketFactory, BackoffFactory backoffFactory,
-			Application app, LocationUtils locationUtils, EventBus eventBus) {
+			Application app, LocationUtils locationUtils, EventBus eventBus,
+			Clock clock) {
 		Context appContext = app.getApplicationContext();
 		DuplexPluginFactory bluetooth =
 				new AndroidBluetoothPluginFactory(ioExecutor, androidExecutor,
 						appContext, random, eventBus, backoffFactory);
 		DuplexPluginFactory tor = new TorPluginFactory(ioExecutor, scheduler,
-				appContext, locationUtils, eventBus,
-				torSocketFactory, backoffFactory);
+				appContext, locationUtils, eventBus, torSocketFactory,
+				backoffFactory, clock);
 		DuplexPluginFactory lan = new AndroidLanTcpPluginFactory(ioExecutor,
 				scheduler, backoffFactory, appContext);
 		Collection<DuplexPluginFactory> duplex = asList(bluetooth, tor, lan);

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

@@ -0,0 +1,83 @@
+package org.briarproject.briar.android;
+
+import android.app.NotificationChannel;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.support.v4.app.NotificationCompat;
+import android.support.v4.content.ContextCompat;
+
+import org.briarproject.bramble.api.db.DatabaseConfig;
+import org.briarproject.briar.R;
+import org.briarproject.briar.android.navdrawer.NavDrawerActivity;
+
+import javax.inject.Inject;
+
+import static android.app.NotificationManager.IMPORTANCE_LOW;
+import static android.content.Context.NOTIFICATION_SERVICE;
+import static android.content.Intent.ACTION_BOOT_COMPLETED;
+import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
+import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
+import static android.os.Build.VERSION.SDK_INT;
+import static android.support.v4.app.NotificationCompat.PRIORITY_LOW;
+import static android.support.v4.app.NotificationCompat.VISIBILITY_SECRET;
+import static org.briarproject.briar.android.TestingConstants.FEATURE_FLAG_SIGN_IN_REMINDER;
+import static org.briarproject.briar.api.android.AndroidNotificationManager.REMINDER_CHANNEL_ID;
+import static org.briarproject.briar.api.android.AndroidNotificationManager.REMINDER_NOTIFICATION_ID;
+
+public class BootReceiver extends BroadcastReceiver {
+
+	@Inject
+	DatabaseConfig databaseConfig;
+
+	@Override
+	public void onReceive(Context ctx, Intent intent) {
+		if (!FEATURE_FLAG_SIGN_IN_REMINDER) return;
+
+		AndroidComponent applicationComponent =
+				((BriarApplication) ctx.getApplicationContext())
+						.getApplicationComponent();
+		applicationComponent.inject(this);
+
+		String action = intent.getAction();
+		if (action != null && action.equals(ACTION_BOOT_COMPLETED)) {
+			if (databaseConfig.databaseExists()) {
+				showSignInNotification(ctx);
+			}
+		}
+	}
+
+	private void showSignInNotification(Context ctx) {
+		NotificationManager nm = (NotificationManager)
+				ctx.getSystemService(NOTIFICATION_SERVICE);
+		if (nm == null) return;
+
+		if (SDK_INT >= 26) {
+			NotificationChannel channel =
+					new NotificationChannel(REMINDER_CHANNEL_ID, ctx.getString(
+							R.string.reminder_notification_channel_title),
+							IMPORTANCE_LOW);
+			channel.setLockscreenVisibility(VISIBILITY_SECRET);
+			nm.createNotificationChannel(channel);
+		}
+
+		NotificationCompat.Builder b =
+				new NotificationCompat.Builder(ctx, REMINDER_CHANNEL_ID);
+		b.setSmallIcon(R.drawable.notification_reminder);
+		b.setColor(ContextCompat.getColor(ctx, R.color.briar_primary));
+		b.setContentTitle(ctx.getText(R.string.reminder_notification_title));
+		b.setContentText(ctx.getText(R.string.reminder_notification_text));
+		b.setAutoCancel(true);
+		b.setWhen(0); // Don't show the time
+		b.setPriority(PRIORITY_LOW);
+
+		Intent i = new Intent(ctx, NavDrawerActivity.class);
+		i.setFlags(FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_CLEAR_TOP);
+		b.setContentIntent(PendingIntent.getActivity(ctx, 0, i, 0));
+
+		nm.notify(REMINDER_NOTIFICATION_ID, b.build());
+	}
+
+}

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

@@ -2,9 +2,12 @@ package org.briarproject.briar.android;
 
 import android.app.Application;
 import android.content.Context;
+import android.content.SharedPreferences;
+import android.content.res.Configuration;
 import android.os.StrictMode;
 import android.os.StrictMode.ThreadPolicy;
 import android.os.StrictMode.VmPolicy;
+import android.preference.PreferenceManager;
 
 import org.acra.ACRA;
 import org.acra.ReportingInteractionMode;
@@ -16,12 +19,14 @@ 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.util.UiUtils;
 
 import java.util.Collection;
 import java.util.logging.Handler;
 import java.util.logging.LogRecord;
 import java.util.logging.Logger;
 
+import static java.util.logging.Level.FINE;
 import static java.util.logging.Level.INFO;
 import static org.acra.ReportField.ANDROID_VERSION;
 import static org.acra.ReportField.APP_VERSION_CODE;
@@ -75,7 +80,13 @@ public class BriarApplicationImpl extends Application
 
 	@Override
 	protected void attachBaseContext(Context base) {
-		super.attachBaseContext(base);
+		SharedPreferences prefs =
+				PreferenceManager.getDefaultSharedPreferences(base);
+		// Loading the language needs to be done here.
+		Localizer.initialize(prefs);
+		super.attachBaseContext(
+				Localizer.getInstance().setLocale(base));
+		setTheme(base, prefs);
 		ACRA.init(this);
 	}
 
@@ -93,7 +104,7 @@ public class BriarApplicationImpl extends Application
 			}
 		}
 		rootLogger.addHandler(logHandler);
-		rootLogger.setLevel(INFO);
+		rootLogger.setLevel(IS_DEBUG_BUILD || IS_BETA_BUILD ? FINE : INFO);
 
 		LOG.info("Created");
 
@@ -108,6 +119,23 @@ public class BriarApplicationImpl extends Application
 		AndroidEagerSingletons.initEagerSingletons(applicationComponent);
 	}
 
+	@Override
+	public void onConfigurationChanged(Configuration newConfig) {
+		super.onConfigurationChanged(newConfig);
+		Localizer.getInstance().setLocale(this);
+	}
+
+	private void setTheme(Context ctx, SharedPreferences prefs) {
+		String theme = prefs.getString("pref_key_theme", null);
+		if (theme == null) {
+			// set default value
+			theme = getString(R.string.pref_theme_light_value);
+			prefs.edit().putString("pref_key_theme", theme).apply();
+		}
+		// set theme
+		UiUtils.setTheme(ctx, theme);
+	}
+
 	private void enableStrictMode() {
 		ThreadPolicy.Builder threadPolicy = new ThreadPolicy.Builder();
 		threadPolicy.detectAll();

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

@@ -1,5 +1,7 @@
 package org.briarproject.briar.android;
 
+import android.app.ActivityManager;
+import android.app.ActivityManager.RunningAppProcessInfo;
 import android.app.NotificationChannel;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
@@ -30,6 +32,7 @@ import java.util.logging.Logger;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import static android.app.ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND;
 import static android.app.NotificationManager.IMPORTANCE_DEFAULT;
 import static android.app.NotificationManager.IMPORTANCE_NONE;
 import static android.app.PendingIntent.FLAG_UPDATE_CURRENT;
@@ -47,6 +50,11 @@ import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.ALREADY_RUNNING;
 import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.SUCCESS;
+import static org.briarproject.briar.api.android.AndroidNotificationManager.FAILURE_CHANNEL_ID;
+import static org.briarproject.briar.api.android.AndroidNotificationManager.FAILURE_NOTIFICATION_ID;
+import static org.briarproject.briar.api.android.AndroidNotificationManager.ONGOING_CHANNEL_ID;
+import static org.briarproject.briar.api.android.AndroidNotificationManager.ONGOING_NOTIFICATION_ID;
+import static org.briarproject.briar.api.android.AndroidNotificationManager.REMINDER_NOTIFICATION_ID;
 
 public class BriarService extends Service {
 
@@ -57,14 +65,6 @@ public class BriarService extends Service {
 	public static String EXTRA_STARTUP_FAILED =
 			"org.briarproject.briar.STARTUP_FAILED";
 
-	private static final int ONGOING_NOTIFICATION_ID = 1;
-	private static final int FAILURE_NOTIFICATION_ID = 2;
-
-	// Channels are sorted by channel ID in the Settings app, so use IDs
-	// that will sort below the main channels such as contacts
-	private static final String ONGOING_CHANNEL_ID = "zForegroundService";
-	private static final String FAILURE_CHANNEL_ID = "zStartupFailure";
-
 	private static final Logger LOG =
 			Logger.getLogger(BriarService.class.getName());
 
@@ -103,9 +103,9 @@ public class BriarService extends Service {
 		}
 
 		// Create notification channels
+		NotificationManager nm = (NotificationManager)
+				getSystemService(NOTIFICATION_SERVICE);
 		if (SDK_INT >= 26) {
-			NotificationManager nm = (NotificationManager)
-					getSystemService(NOTIFICATION_SERVICE);
 			NotificationChannel ongoingChannel = new NotificationChannel(
 					ONGOING_CHANNEL_ID,
 					getString(R.string.ongoing_notification_title),
@@ -137,6 +137,8 @@ public class BriarService extends Service {
 		}
 		b.setPriority(PRIORITY_MIN);
 		startForeground(ONGOING_NOTIFICATION_ID, b.build());
+		// Remove sign-in reminder notification
+		nm.cancel(REMINDER_NOTIFICATION_ID);
 		// Start the services in a background thread
 		new Thread(() -> {
 			String nickname = databaseConfig.getLocalAuthorName();
@@ -168,6 +170,11 @@ public class BriarService extends Service {
 		registerReceiver(receiver, filter);
 	}
 
+	@Override
+	protected void attachBaseContext(Context base) {
+		super.attachBaseContext(Localizer.getInstance().setLocale(base));
+	}
+
 	private void showStartupFailureNotification(StartResult result) {
 		androidExecutor.runOnUiThread(() -> {
 			NotificationCompat.Builder b = new NotificationCompat.Builder(
@@ -243,8 +250,10 @@ public class BriarService extends Service {
 				LOG.info("Trim memory: running low");
 			} else if (level == TRIM_MEMORY_RUNNING_CRITICAL) {
 				LOG.info("Trim memory: running critically low");
-				// Clear the UI to save some memory
-				hideUi();
+				// If we're not in the foreground, clear the UI to save memory
+				RunningAppProcessInfo info = new RunningAppProcessInfo();
+				ActivityManager.getMyMemoryState(info);
+				if (info.importance != IMPORTANCE_FOREGROUND) hideUi();
 			} else if (LOG.isLoggable(INFO)) {
 				LOG.info("Trim memory: unknown level " + level);
 			}

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

@@ -0,0 +1,92 @@
+package org.briarproject.briar.android;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.content.res.Configuration;
+import android.content.res.Resources;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import java.util.Locale;
+
+import javax.annotation.Nullable;
+
+import static android.os.Build.VERSION.SDK_INT;
+import static org.briarproject.briar.android.settings.SettingsFragment.LANGUAGE;
+
+@NotNullByDefault
+public class Localizer {
+
+	// Locking: class
+	@Nullable
+	private static Localizer INSTANCE;
+	private final Locale systemLocale;
+	private final Locale locale;
+
+	private Localizer(SharedPreferences sharedPreferences) {
+		this(Locale.getDefault(), getLocaleFromTag(
+				sharedPreferences.getString(LANGUAGE, "default")));
+	}
+
+	private Localizer(Locale systemLocale, @Nullable Locale userLocale) {
+		this.systemLocale = systemLocale;
+		if (userLocale == null) locale = systemLocale;
+		else locale = userLocale;
+	}
+
+	// Instantiate the Localizer.
+	public static synchronized void initialize(SharedPreferences prefs) {
+		if (INSTANCE == null)
+			INSTANCE = new Localizer(prefs);
+	}
+
+	// Reinstantiate the Localizer with the system locale
+	public static synchronized void reinitialize() {
+		if (INSTANCE != null)
+			INSTANCE = new Localizer(INSTANCE.systemLocale, null);
+	}
+
+	// Get the current instance.
+	public static synchronized Localizer getInstance() {
+		if (INSTANCE == null)
+			throw new IllegalStateException("Localizer not initialized");
+		return INSTANCE;
+	}
+
+	// Get Locale from BCP-47 tag
+	@Nullable
+	public static Locale getLocaleFromTag(String tag) {
+		if (tag.equals("default"))
+			return null;
+		if (SDK_INT >= 21) {
+			return Locale.forLanguageTag(tag);
+		}
+		if (tag.contains("-")) {
+			String[] langArray = tag.split("-");
+			return new Locale(langArray[0], langArray[1]);
+		} else
+			return new Locale(tag);
+	}
+
+	// Returns the localized version of context
+	public Context setLocale(Context context) {
+		Resources res = context.getResources();
+		Configuration conf = res.getConfiguration();
+		Locale currentLocale;
+		if (SDK_INT >= 24) {
+			currentLocale = conf.getLocales().get(0);
+		} else
+			currentLocale = conf.locale;
+		if (locale.equals(currentLocale))
+			return context;
+		Locale.setDefault(locale);
+		if (SDK_INT >= 17) {
+			conf.setLocale(locale);
+			context.createConfigurationContext(conf);
+		} else
+			conf.locale = locale;
+		//noinspection deprecation
+		res.updateConfiguration(conf, res.getDisplayMetrics());
+		return context;
+	}
+}

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

@@ -4,11 +4,11 @@ import android.net.TrafficStats;
 import android.os.Process;
 
 import org.briarproject.bramble.api.lifecycle.Service;
-import org.briarproject.bramble.api.lifecycle.ServiceException;
 
 import java.util.logging.Logger;
 
 import static java.util.logging.Level.INFO;
+import static org.briarproject.bramble.util.LogUtils.now;
 
 class NetworkUsageLogger implements Service {
 
@@ -18,17 +18,17 @@ class NetworkUsageLogger implements Service {
 	private volatile long startTime, rxBytes, txBytes;
 
 	@Override
-	public void startService() throws ServiceException {
-		startTime = System.currentTimeMillis();
+	public void startService() {
+		startTime = now();
 		int uid = Process.myUid();
 		rxBytes = TrafficStats.getUidRxBytes(uid);
 		txBytes = TrafficStats.getUidTxBytes(uid);
 	}
 
 	@Override
-	public void stopService() throws ServiceException {
+	public void stopService() {
 		if (LOG.isLoggable(INFO)) {
-			long sessionDuration = System.currentTimeMillis() - startTime;
+			long sessionDuration = now() - startTime;
 			int uid = Process.myUid();
 			long rx = TrafficStats.getUidRxBytes(uid) - rxBytes;
 			long tx = TrafficStats.getUidTxBytes(uid) - txBytes;

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

@@ -48,6 +48,7 @@ import static android.content.pm.PackageManager.GET_PERMISSIONS;
 import static android.content.pm.PackageManager.GET_SIGNATURES;
 import static android.os.Build.VERSION.SDK_INT;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
 class ScreenFilterMonitorImpl implements ScreenFilterMonitor, Service {
@@ -189,7 +190,7 @@ class ScreenFilterMonitorImpl implements ScreenFilterMonitor, Service {
 			String publicKey = StringUtils.toHexString(publicKeyBytes);
 			return PLAY_SERVICES_PUBLIC_KEY.equals(publicKey);
 		} catch (NameNotFoundException | CertificateException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return false;
 		}
 	}

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

@@ -30,4 +30,14 @@ public interface TestingConstants {
 	long EXPIRY_DATE = IS_DEBUG_BUILD || IS_BETA_BUILD ?
 			BuildConfig.BuildTimestamp + 90 * 24 * 60 * 60 * 1000L :
 			Long.MAX_VALUE;
+
+	/**
+	 * Feature flag for enabling the dark UI theme in release builds.
+	 */
+	boolean FEATURE_FLAG_DARK_THEME = false;
+
+	/**
+	 * Feature flag for enabling the sign-in reminder in release builds.
+	 */
+	boolean FEATURE_FLAG_SIGN_IN_REMINDER = IS_DEBUG_BUILD;
 }

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

@@ -26,9 +26,10 @@ import org.briarproject.briar.android.fragment.ScreenFilterDialogFragment;
 import org.briarproject.briar.android.introduction.ContactChooserFragment;
 import org.briarproject.briar.android.introduction.IntroductionActivity;
 import org.briarproject.briar.android.introduction.IntroductionMessageFragment;
+import org.briarproject.briar.android.keyagreement.ContactExchangeActivity;
 import org.briarproject.briar.android.keyagreement.IntroFragment;
 import org.briarproject.briar.android.keyagreement.KeyAgreementActivity;
-import org.briarproject.briar.android.keyagreement.ShowQrCodeFragment;
+import org.briarproject.briar.android.keyagreement.KeyAgreementFragment;
 import org.briarproject.briar.android.login.AuthorNameFragment;
 import org.briarproject.briar.android.login.ChangePasswordActivity;
 import org.briarproject.briar.android.login.DozeFragment;
@@ -100,6 +101,8 @@ public interface ActivityComponent {
 
 	void inject(PanicPreferencesActivity activity);
 
+	void inject(ContactExchangeActivity activity);
+
 	void inject(KeyAgreementActivity activity);
 
 	void inject(ConversationActivity activity);
@@ -185,7 +188,7 @@ public interface ActivityComponent {
 
 	void inject(IntroFragment fragment);
 
-	void inject(ShowQrCodeFragment fragment);
+	void inject(KeyAgreementFragment fragment);
 
 	void inject(ContactChooserFragment fragment);
 

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

@@ -1,5 +1,6 @@
 package org.briarproject.briar.android.activity;
 
+import android.content.Context;
 import android.os.Bundle;
 import android.os.IBinder;
 import android.support.annotation.LayoutRes;
@@ -18,6 +19,7 @@ import org.briarproject.briar.R;
 import org.briarproject.briar.android.AndroidComponent;
 import org.briarproject.briar.android.BriarApplication;
 import org.briarproject.briar.android.DestroyableContext;
+import org.briarproject.briar.android.Localizer;
 import org.briarproject.briar.android.controller.ActivityLifecycleController;
 import org.briarproject.briar.android.forum.ForumModule;
 import org.briarproject.briar.android.fragment.BaseFragment;
@@ -84,6 +86,12 @@ public abstract class BaseActivity extends AppCompatActivity
 		}
 	}
 
+	@Override
+	protected void attachBaseContext(Context base) {
+		super.attachBaseContext(
+				Localizer.getInstance().setLocale(base));
+	}
+
 	public ActivityComponent getActivityComponent() {
 		return activityComponent;
 	}

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

@@ -92,7 +92,6 @@ public abstract class BriarActivity extends BaseActivity {
 		window.setEnterTransition(slide);
 		window.setTransitionBackgroundFadeDuration(getResources()
 				.getInteger(android.R.integer.config_longAnimTime));
-		window.setBackgroundDrawableResource(android.R.color.transparent);
 	}
 
 	/**

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

@@ -32,8 +32,10 @@ import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
 
-import static java.util.logging.Level.INFO;
 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.util.HtmlUtils.ARTICLE;
 
 @MethodsNotNullByDefault
@@ -101,30 +103,25 @@ abstract class BaseControllerImpl extends DbControllerImpl
 				Collection<BlogPostItem> items = loadItems(groupId);
 				handler.onResult(items);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING))
-					LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});
 	}
 
 	Collection<BlogPostItem> loadItems(GroupId groupId) throws DbException {
-		long now = System.currentTimeMillis();
+		long start = now();
 		Collection<BlogPostHeader> headers =
 				blogManager.getPostHeaders(groupId);
-		long duration = System.currentTimeMillis() - now;
-		if (LOG.isLoggable(INFO))
-			LOG.info("Loading headers took " + duration + " ms");
+		logDuration(LOG, "Loading headers", start);
 		Collection<BlogPostItem> items = new ArrayList<>(headers.size());
-		now = System.currentTimeMillis();
+		start = now();
 		for (BlogPostHeader h : headers) {
 			headerCache.put(h.getId(), h);
 			BlogPostItem item = getItem(h);
 			items.add(item);
 		}
-		duration = System.currentTimeMillis() - now;
-		if (LOG.isLoggable(INFO))
-			LOG.info("Loading bodies took " + duration + " ms");
+		logDuration(LOG, "Loading bodies", start);
 		return items;
 	}
 
@@ -140,15 +137,12 @@ abstract class BaseControllerImpl extends DbControllerImpl
 		}
 		runOnDbThread(() -> {
 			try {
-				long now = System.currentTimeMillis();
+				long start = now();
 				BlogPostItem item = getItem(header);
-				long duration = System.currentTimeMillis() - now;
-				if (LOG.isLoggable(INFO))
-					LOG.info("Loading body took " + duration + " ms");
+				logDuration(LOG, "Loading body", start);
 				handler.onResult(item);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING))
-					LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});
@@ -166,16 +160,13 @@ abstract class BaseControllerImpl extends DbControllerImpl
 		}
 		runOnDbThread(() -> {
 			try {
-				long now = System.currentTimeMillis();
+				long start = now();
 				BlogPostHeader header1 = getPostHeader(g, m);
 				BlogPostItem item = getItem(header1);
-				long duration = System.currentTimeMillis() - now;
-				if (LOG.isLoggable(INFO))
-					LOG.info("Loading post took " + duration + " ms");
+				logDuration(LOG, "Loading post", start);
 				handler.onResult(item);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING))
-					LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});
@@ -191,8 +182,7 @@ abstract class BaseControllerImpl extends DbControllerImpl
 				BlogPostHeader h = item.getHeader();
 				blogManager.addLocalComment(a, b.getId(), comment, h);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING))
-					LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});

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

@@ -35,8 +35,10 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
-import static java.util.logging.Level.INFO;
 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;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -154,19 +156,16 @@ class BlogControllerImpl extends BaseControllerImpl
 		if (groupId == null) throw new IllegalStateException();
 		runOnDbThread(() -> {
 			try {
-				long now = System.currentTimeMillis();
+				long start = now();
 				LocalAuthor a = identityManager.getLocalAuthor();
 				Blog b = blogManager.getBlog(groupId);
 				boolean ours = a.getId().equals(b.getAuthor().getId());
 				boolean removable = blogManager.canBeRemoved(b);
 				BlogItem blog = new BlogItem(b, ours, removable);
-				long duration = System.currentTimeMillis() - now;
-				if (LOG.isLoggable(INFO))
-					LOG.info("Loading blog took " + duration + " ms");
+				logDuration(LOG, "Loading blog", start);
 				handler.onResult(blog);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING))
-					LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});
@@ -177,16 +176,13 @@ class BlogControllerImpl extends BaseControllerImpl
 		if (groupId == null) throw new IllegalStateException();
 		runOnDbThread(() -> {
 			try {
-				long now = System.currentTimeMillis();
+				long start = now();
 				Blog b = blogManager.getBlog(groupId);
 				blogManager.removeBlog(b);
-				long duration = System.currentTimeMillis() - now;
-				if (LOG.isLoggable(INFO))
-					LOG.info("Removing blog took " + duration + " ms");
+				logDuration(LOG, "Removing blog", start);
 				handler.onResult(null);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING))
-					LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});
@@ -205,8 +201,7 @@ class BlogControllerImpl extends BaseControllerImpl
 				for (Contact c : contacts) contactIds.add(c.getId());
 				handler.onResult(contactIds);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING))
-					LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});

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

@@ -11,7 +11,7 @@ import android.text.Spanned;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.ImageView;
+import android.widget.ImageButton;
 import android.widget.TextView;
 
 import org.briarproject.bramble.api.identity.Author;
@@ -40,7 +40,7 @@ class BlogPostViewHolder extends RecyclerView.ViewHolder {
 	private final ViewGroup layout;
 	private final AuthorView reblogger;
 	private final AuthorView author;
-	private final ImageView reblogButton;
+	private final ImageButton reblogButton;
 	private final TextView body;
 	private final ViewGroup commentContainer;
 	private final boolean fullText;

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

@@ -26,8 +26,10 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
-import static java.util.logging.Level.INFO;
 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.blog.BlogManager.CLIENT_ID;
 
 @MethodsNotNullByDefault
@@ -99,22 +101,19 @@ class FeedControllerImpl extends BaseControllerImpl
 			ResultExceptionHandler<Collection<BlogPostItem>, DbException> handler) {
 		runOnDbThread(() -> {
 			try {
-				long now = System.currentTimeMillis();
+				long start = now();
 				Collection<BlogPostItem> posts = new ArrayList<>();
 				for (Blog b : blogManager.getBlogs()) {
 					try {
 						posts.addAll(loadItems(b.getId()));
 					} catch (NoSuchGroupException | NoSuchMessageException e) {
-						if (LOG.isLoggable(WARNING))
-							LOG.log(WARNING, e.toString(), e);
+						logException(LOG, WARNING, e);
 					}
 				}
-				long duration = System.currentTimeMillis() - now;
-				if (LOG.isLoggable(INFO))
-					LOG.info("Loading all posts took " + duration + " ms");
+				logDuration(LOG, "Loading all posts", start);
 				handler.onResult(posts);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});
@@ -125,15 +124,13 @@ class FeedControllerImpl extends BaseControllerImpl
 			ResultExceptionHandler<Blog, DbException> handler) {
 		runOnDbThread(() -> {
 			try {
-				long now = System.currentTimeMillis();
+				long start = now();
 				Author a = identityManager.getLocalAuthor();
 				Blog b = blogManager.getPersonalBlog(a);
-				long duration = System.currentTimeMillis() - now;
-				if (LOG.isLoggable(INFO))
-					LOG.info("Loading blog took " + duration + " ms");
+				logDuration(LOG, "Loading personal blog", start);
 				handler.onResult(b);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});

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

@@ -30,6 +30,7 @@ import javax.inject.Inject;
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 public class RssFeedImportActivity extends BriarActivity {
 
@@ -124,7 +125,7 @@ public class RssFeedImportActivity extends BriarActivity {
 				feedManager.addFeed(url);
 				feedImported();
 			} catch (DbException | IOException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				importFailed();
 			}
 		});

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

@@ -27,6 +27,7 @@ import javax.inject.Inject;
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 import static android.support.design.widget.Snackbar.LENGTH_LONG;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 public class RssFeedManageActivity extends BriarActivity
 		implements RssFeedListener {
@@ -123,7 +124,7 @@ public class RssFeedManageActivity extends BriarActivity
 			try {
 				displayFeeds(revision, feedManager.getFeeds());
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				onLoadError();
 			}
 		});
@@ -148,7 +149,7 @@ public class RssFeedManageActivity extends BriarActivity
 				feedManager.removeFeed(feed);
 				onFeedDeleted(feed);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				onDeleteError();
 			}
 		});

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

@@ -34,6 +34,7 @@ import javax.inject.Inject;
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.briar.api.blog.BlogConstants.MAX_BLOG_POST_BODY_LENGTH;
 
 public class WriteBlogPostActivity extends BriarActivity
@@ -142,16 +143,16 @@ public class WriteBlogPostActivity extends BriarActivity
 
 	private void storePost(String body) {
 		runOnDbThread(() -> {
-			long now = System.currentTimeMillis();
+			long timestamp = System.currentTimeMillis();
 			try {
 				LocalAuthor author = identityManager.getLocalAuthor();
 				BlogPost p = blogPostFactory
-						.createBlogPost(groupId, now, null, author, body);
+						.createBlogPost(groupId, timestamp, null, author, body);
 				blogManager.addLocalPost(p);
 				postPublished();
 			} catch (DbException | GeneralSecurityException
 					| FormatException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				postFailedToPublish();
 			}
 		});

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

@@ -33,7 +33,7 @@ import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.contact.BaseContactListAdapter.OnContactClickListener;
 import org.briarproject.briar.android.fragment.BaseFragment;
-import org.briarproject.briar.android.keyagreement.KeyAgreementActivity;
+import org.briarproject.briar.android.keyagreement.ContactExchangeActivity;
 import org.briarproject.briar.android.view.BriarRecyclerView;
 import org.briarproject.briar.api.android.AndroidNotificationManager;
 import org.briarproject.briar.api.client.BaseMessageHeader;
@@ -59,8 +59,10 @@ import javax.inject.Inject;
 
 import static android.support.v4.app.ActivityOptionsCompat.makeSceneTransitionAnimation;
 import static android.support.v4.view.ViewCompat.getTransitionName;
-import static java.util.logging.Level.INFO;
 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.android.contact.ConversationActivity.CONTACT_ID;
 
 @MethodsNotNullByDefault
@@ -163,7 +165,7 @@ public class ContactListFragment extends BaseFragment implements EventListener {
 		switch (item.getItemId()) {
 			case R.id.action_add_contact:
 				Intent intent =
-						new Intent(getContext(), KeyAgreementActivity.class);
+						new Intent(getContext(), ContactExchangeActivity.class);
 				startActivity(intent);
 				return true;
 			default:
@@ -194,7 +196,7 @@ public class ContactListFragment extends BaseFragment implements EventListener {
 		int revision = adapter.getRevision();
 		listener.runOnDbThread(() -> {
 			try {
-				long now = System.currentTimeMillis();
+				long start = now();
 				List<ContactListItem> contacts = new ArrayList<>();
 				for (Contact c : contactManager.getActiveContacts()) {
 					try {
@@ -208,12 +210,10 @@ public class ContactListFragment extends BaseFragment implements EventListener {
 						// Continue
 					}
 				}
-				long duration = System.currentTimeMillis() - now;
-				if (LOG.isLoggable(INFO))
-					LOG.info("Full load took " + duration + " ms");
+				logDuration(LOG, "Full load", start);
 				displayContacts(revision, contacts);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}

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

@@ -106,6 +106,9 @@ import static android.support.v7.util.SortedList.INVALID_POSITION;
 import static android.widget.Toast.LENGTH_SHORT;
 import static java.util.logging.Level.INFO;
 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.android.activity.RequestCodes.REQUEST_INTRODUCTION;
 import static org.briarproject.briar.android.settings.SettingsFragment.SETTINGS_NAMESPACE;
 import static org.briarproject.briar.android.util.UiUtils.getAvatarTransitionName;
@@ -290,21 +293,19 @@ public class ConversationActivity extends BriarActivity
 	private void loadContactDetailsAndMessages() {
 		runOnDbThread(() -> {
 			try {
-				long now = System.currentTimeMillis();
+				long start = now();
 				if (contactName == null || contactAuthorId == null) {
 					Contact contact = contactManager.getContact(contactId);
 					contactName = contact.getAuthor().getName();
 					contactAuthorId = contact.getAuthor().getId();
 				}
-				long duration = System.currentTimeMillis() - now;
-				if (LOG.isLoggable(INFO))
-					LOG.info("Loading contact took " + duration + " ms");
+				logDuration(LOG, "Loading contact", start);
 				loadMessages();
 				displayContactDetails();
 			} catch (NoSuchContactException e) {
 				finishOnUiThread();
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -340,7 +341,7 @@ public class ConversationActivity extends BriarActivity
 		int revision = adapter.getRevision();
 		runOnDbThread(() -> {
 			try {
-				long now = System.currentTimeMillis();
+				long start = now();
 				Collection<PrivateMessageHeader> headers =
 						messagingManager.getMessageHeaders(contactId);
 				Collection<IntroductionMessage> introductions =
@@ -357,14 +358,12 @@ public class ConversationActivity extends BriarActivity
 				invitations.addAll(forumInvitations);
 				invitations.addAll(blogInvitations);
 				invitations.addAll(groupInvitations);
-				long duration = System.currentTimeMillis() - now;
-				if (LOG.isLoggable(INFO))
-					LOG.info("Loading messages took " + duration + " ms");
+				logDuration(LOG, "Loading messages", start);
 				displayMessages(revision, headers, introductions, invitations);
 			} catch (NoSuchContactException e) {
 				finishOnUiThread();
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -438,14 +437,12 @@ public class ConversationActivity extends BriarActivity
 	private void loadMessageBody(MessageId m) {
 		runOnDbThread(() -> {
 			try {
-				long now = System.currentTimeMillis();
+				long start = now();
 				String body = messagingManager.getMessageBody(m);
-				long duration = System.currentTimeMillis() - now;
-				if (LOG.isLoggable(INFO))
-					LOG.info("Loading body took " + duration + " ms");
+				logDuration(LOG, "Loading body", start);
 				displayMessageBody(m, body);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -669,7 +666,7 @@ public class ConversationActivity extends BriarActivity
 						messagingManager.getConversationId(contactId);
 				createMessage(body, timestamp);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 
 		});
@@ -689,11 +686,9 @@ public class ConversationActivity extends BriarActivity
 	private void storeMessage(PrivateMessage m, String body) {
 		runOnDbThread(() -> {
 			try {
-				long now = System.currentTimeMillis();
+				long start = now();
 				messagingManager.addLocalMessage(m);
-				long duration = System.currentTimeMillis() - now;
-				if (LOG.isLoggable(INFO))
-					LOG.info("Storing message took " + duration + " ms");
+				logDuration(LOG, "Storing message", start);
 				Message message = m.getMessage();
 				PrivateMessageHeader h = new PrivateMessageHeader(
 						message.getId(), message.getGroupId(),
@@ -703,7 +698,7 @@ public class ConversationActivity extends BriarActivity
 				bodyCache.put(message.getId(), body);
 				addConversationItem(item);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -726,7 +721,7 @@ public class ConversationActivity extends BriarActivity
 			try {
 				contactManager.removeContact(contactId);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			} finally {
 				finishAfterContactRemoved();
 			}
@@ -755,7 +750,7 @@ public class ConversationActivity extends BriarActivity
 					}
 				}
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -803,7 +798,7 @@ public class ConversationActivity extends BriarActivity
 				settings.putBoolean(SHOW_ONBOARDING_INTRODUCTION, false);
 				settingsManager.mergeSettings(settings, SETTINGS_NAMESPACE);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -816,13 +811,11 @@ public class ConversationActivity extends BriarActivity
 	private void markMessageRead(GroupId g, MessageId m) {
 		runOnDbThread(() -> {
 			try {
-				long now = System.currentTimeMillis();
+				long start = now();
 				messagingManager.setReadFlag(g, m, true);
-				long duration = System.currentTimeMillis() - now;
-				if (LOG.isLoggable(INFO))
-					LOG.info("Marking read took " + duration + " ms");
+				logDuration(LOG, "Marking read", start);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -860,10 +853,10 @@ public class ConversationActivity extends BriarActivity
 				loadMessages();
 			} catch (ProtocolStateException e) {
 				// Action is no longer valid - reloading should solve the issue
-				if (LOG.isLoggable(INFO)) LOG.log(INFO, e.toString(), e);
+				logException(LOG, INFO, e);
 			} catch (DbException e) {
 				// TODO show an error message
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}

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

@@ -19,6 +19,7 @@ import java.util.logging.Logger;
 import javax.annotation.concurrent.Immutable;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @Immutable
 @NotNullByDefault
@@ -53,7 +54,7 @@ public abstract class ContactSelectorControllerImpl
 				}
 				handler.onResult(contacts);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});

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

@@ -21,6 +21,7 @@ import java.util.logging.Logger;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.briar.android.settings.SettingsFragment.SETTINGS_NAMESPACE;
 import static org.briarproject.briar.android.util.UiUtils.needsDozeWhitelisting;
 
@@ -101,8 +102,7 @@ public class BriarControllerImpl implements BriarController {
 				boolean ask = settings.getBoolean(DOZE_ASK_AGAIN, true);
 				handler.onResult(ask);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING))
-					LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -115,8 +115,7 @@ public class BriarControllerImpl implements BriarController {
 				settings.putBoolean(DOZE_ASK_AGAIN, false);
 				settingsManager.mergeSettings(settings, SETTINGS_NAMESPACE);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING))
-					LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}

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

@@ -20,6 +20,7 @@ import javax.annotation.Nullable;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
 public class ConfigControllerImpl implements ConfigController {
@@ -89,7 +90,7 @@ public class ConfigControllerImpl implements ConfigController {
 			reader.close();
 			return key;
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return null;
 		}
 	}
@@ -137,7 +138,7 @@ public class ConfigControllerImpl implements ConfigController {
 			LOG.info("Stored second copy of database key in backup file");
 			return true;
 		} catch (IOException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return false;
 		}
 	}

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

@@ -28,8 +28,10 @@ import javax.inject.Inject;
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 import static android.widget.Toast.LENGTH_LONG;
-import static java.util.logging.Level.INFO;
 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.ForumConstants.MAX_FORUM_NAME_LENGTH;
 
 @MethodsNotNullByDefault
@@ -122,14 +124,12 @@ public class CreateForumActivity extends BriarActivity {
 	private void storeForum(String name) {
 		runOnDbThread(() -> {
 			try {
-				long now = System.currentTimeMillis();
+				long start = now();
 				Forum f = forumManager.addForum(name);
-				long duration = System.currentTimeMillis() - now;
-				if (LOG.isLoggable(INFO))
-					LOG.info("Storing forum took " + duration + " ms");
+				logDuration(LOG, "Storing forum", start);
 				displayForum(f);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				finishOnUiThread();
 			}
 		});

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

@@ -39,6 +39,7 @@ import javax.inject.Inject;
 
 import static java.lang.Math.max;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
 class ForumControllerImpl extends
@@ -130,7 +131,7 @@ class ForumControllerImpl extends
 				for (Contact c : contacts) contactIds.add(c.getId());
 				handler.onResult(contactIds);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});
@@ -150,7 +151,7 @@ class ForumControllerImpl extends
 						parentItem.getId() : null;
 				createMessage(body, timestamp, parentId, author, handler);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});

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

@@ -2,7 +2,6 @@ package org.briarproject.briar.android.forum;
 
 import android.content.Context;
 import android.content.Intent;
-import android.support.v4.content.ContextCompat;
 import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -55,12 +54,8 @@ class ForumListAdapter
 			ui.postCount.setText(ctx.getResources()
 					.getQuantityString(R.plurals.posts, postCount,
 							postCount));
-			ui.postCount.setTextColor(
-					ContextCompat.getColor(ctx, R.color.briar_text_secondary));
 		} else {
 			ui.postCount.setText(ctx.getString(R.string.no_posts));
-			ui.postCount.setTextColor(
-					ContextCompat.getColor(ctx, R.color.briar_text_tertiary));
 		}
 
 		// Date

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

@@ -44,8 +44,10 @@ import javax.annotation.Nullable;
 import javax.inject.Inject;
 
 import static android.support.design.widget.Snackbar.LENGTH_INDEFINITE;
-import static java.util.logging.Level.INFO;
 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
@@ -157,7 +159,7 @@ public class ForumListFragment extends BaseEventFragment implements
 		int revision = adapter.getRevision();
 		listener.runOnDbThread(() -> {
 			try {
-				long now = System.currentTimeMillis();
+				long start = now();
 				Collection<ForumListItem> forums = new ArrayList<>();
 				for (Forum f : forumManager.getForums()) {
 					try {
@@ -168,12 +170,10 @@ public class ForumListFragment extends BaseEventFragment implements
 						// Continue
 					}
 				}
-				long duration = System.currentTimeMillis() - now;
-				if (LOG.isLoggable(INFO))
-					LOG.info("Full load took " + duration + " ms");
+				logDuration(LOG, "Full load", start);
 				displayForums(revision, forums);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -194,14 +194,12 @@ public class ForumListFragment extends BaseEventFragment implements
 	private void loadAvailableForums() {
 		listener.runOnDbThread(() -> {
 			try {
-				long now = System.currentTimeMillis();
+				long start = now();
 				int available = forumSharingManager.getInvitations().size();
-				long duration = System.currentTimeMillis() - now;
-				if (LOG.isLoggable(INFO))
-					LOG.info("Loading available took " + duration + " ms");
+				logDuration(LOG, "Loading available", start);
 				displayAvailableForums(available);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}

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

@@ -29,6 +29,7 @@ import java.util.logging.Logger;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.briar.android.contact.ConversationActivity.CONTACT_ID;
 
 public class ContactChooserFragment extends BaseFragment {
@@ -129,7 +130,7 @@ public class ContactChooserFragment extends BaseFragment {
 				}
 				displayContacts(contacts);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}

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

@@ -36,6 +36,7 @@ import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 import static android.widget.Toast.LENGTH_SHORT;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.briar.api.introduction.IntroductionConstants.MAX_REQUEST_MESSAGE_LENGTH;
 
 public class IntroductionMessageFragment extends BaseFragment
@@ -129,7 +130,7 @@ public class IntroductionMessageFragment extends BaseFragment
 				boolean possible = introductionManager.canIntroduce(c1, c2);
 				setUpViews(c1, c2, possible);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -204,7 +205,7 @@ public class IntroductionMessageFragment extends BaseFragment
 				long timestamp = System.currentTimeMillis();
 				introductionManager.makeIntroduction(c1, c2, msg, timestamp);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				introductionError();
 			}
 		});

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

@@ -9,10 +9,12 @@ import android.hardware.Camera.Size;
 import android.support.annotation.Nullable;
 import android.support.annotation.UiThread;
 import android.util.AttributeSet;
+import android.view.Display;
 import android.view.Surface;
 import android.view.SurfaceHolder;
 import android.view.SurfaceView;
 import android.view.View;
+import android.view.WindowManager;
 
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
@@ -21,6 +23,7 @@ import java.io.IOException;
 import java.util.List;
 import java.util.logging.Logger;
 
+import static android.content.Context.WINDOW_SERVICE;
 import static android.hardware.Camera.CameraInfo.CAMERA_FACING_BACK;
 import static android.hardware.Camera.CameraInfo.CAMERA_FACING_FRONT;
 import static android.hardware.Camera.Parameters.FLASH_MODE_OFF;
@@ -35,6 +38,7 @@ import static android.hardware.Camera.Parameters.SCENE_MODE_BARCODE;
 import static android.os.Build.VERSION.SDK_INT;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @SuppressWarnings("deprecation")
 @MethodsNotNullByDefault
@@ -96,7 +100,7 @@ public class CameraView extends SurfaceView implements SurfaceHolder.Callback,
 	}
 
 	@UiThread
-	public void start(int rotationDegrees) throws CameraException {
+	public void start() throws CameraException {
 		LOG.info("Opening camera");
 		try {
 			int cameras = Camera.getNumberOfCameras();
@@ -121,7 +125,7 @@ public class CameraView extends SurfaceView implements SurfaceHolder.Callback,
 		} catch (RuntimeException e) {
 			throw new CameraException(e);
 		}
-		setDisplayOrientation(rotationDegrees);
+		setDisplayOrientation(getScreenRotationDegrees());
 		// Use barcode scene mode if it's available
 		Parameters params = camera.getParameters();
 		params = setSceneMode(camera, params);
@@ -156,6 +160,27 @@ public class CameraView extends SurfaceView implements SurfaceHolder.Callback,
 		camera = null;
 	}
 
+	/**
+	 * See {@link Camera#setDisplayOrientation(int)}.
+	 */
+	private int getScreenRotationDegrees() {
+		WindowManager wm =
+				(WindowManager) getContext().getSystemService(WINDOW_SERVICE);
+		Display d = wm.getDefaultDisplay();
+		switch (d.getRotation()) {
+			case Surface.ROTATION_0:
+				return 0;
+			case Surface.ROTATION_90:
+				return 90;
+			case Surface.ROTATION_180:
+				return 180;
+			case Surface.ROTATION_270:
+				return 270;
+			default:
+				throw new AssertionError();
+		}
+	}
+
 	@UiThread
 	private void startPreview(SurfaceHolder holder) throws CameraException {
 		LOG.info("Starting preview");
@@ -408,7 +433,7 @@ public class CameraView extends SurfaceView implements SurfaceHolder.Callback,
 			try {
 				surfaceCreatedUi(holder);
 			} catch (CameraException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -430,7 +455,7 @@ public class CameraView extends SurfaceView implements SurfaceHolder.Callback,
 			try {
 				surfaceChangedUi(holder, w, h);
 			} catch (CameraException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -488,7 +513,7 @@ public class CameraView extends SurfaceView implements SurfaceHolder.Callback,
 		try {
 			startAutoFocus();
 		} catch (CameraException e) {
-			LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 		}
 	}
 

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

@@ -0,0 +1,144 @@
+package org.briarproject.briar.android.keyagreement;
+
+import android.os.Bundle;
+import android.support.annotation.UiThread;
+import android.widget.Toast;
+
+import org.briarproject.bramble.api.contact.ContactExchangeListener;
+import org.briarproject.bramble.api.contact.ContactExchangeTask;
+import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.bramble.api.identity.Author;
+import org.briarproject.bramble.api.identity.IdentityManager;
+import org.briarproject.bramble.api.identity.LocalAuthor;
+import org.briarproject.bramble.api.keyagreement.KeyAgreementResult;
+import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
+import org.briarproject.briar.R;
+import org.briarproject.briar.R.string;
+import org.briarproject.briar.android.activity.ActivityComponent;
+
+import java.util.logging.Logger;
+
+import javax.annotation.Nullable;
+import javax.inject.Inject;
+
+import static android.widget.Toast.LENGTH_LONG;
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+public class ContactExchangeActivity extends KeyAgreementActivity implements
+		ContactExchangeListener {
+
+	private static final Logger LOG =
+			Logger.getLogger(ContactExchangeActivity.class.getName());
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject
+	volatile ContactExchangeTask contactExchangeTask;
+	@Inject
+	volatile IdentityManager identityManager;
+
+	@Override
+	public void injectActivity(ActivityComponent component) {
+		component.inject(this);
+	}
+
+	@Override
+	public void onCreate(@Nullable Bundle state) {
+		super.onCreate(state);
+		getSupportActionBar().setTitle(string.add_contact_title);
+	}
+
+	private void startContactExchange(KeyAgreementResult result) {
+		runOnDbThread(() -> {
+			LocalAuthor localAuthor;
+			// Load the local pseudonym
+			try {
+				localAuthor = identityManager.getLocalAuthor();
+			} catch (DbException e) {
+				logException(LOG, WARNING, e);
+				contactExchangeFailed();
+				return;
+			}
+
+			// Exchange contact details
+			contactExchangeTask.startExchange(ContactExchangeActivity.this,
+					localAuthor, result.getMasterKey(),
+					result.getConnection(), result.getTransportId(),
+					result.wasAlice());
+		});
+	}
+
+	@Override
+	public void contactExchangeSucceeded(Author remoteAuthor) {
+		runOnUiThreadUnlessDestroyed(() -> {
+			String contactName = remoteAuthor.getName();
+			String format = getString(string.contact_added_toast);
+			String text = String.format(format, contactName);
+			Toast.makeText(ContactExchangeActivity.this, text, LENGTH_LONG)
+					.show();
+			supportFinishAfterTransition();
+		});
+	}
+
+	@Override
+	public void duplicateContact(Author remoteAuthor) {
+		runOnUiThreadUnlessDestroyed(() -> {
+			String contactName = remoteAuthor.getName();
+			String format = getString(string.contact_already_exists);
+			String text = String.format(format, contactName);
+			Toast.makeText(ContactExchangeActivity.this, text, LENGTH_LONG)
+					.show();
+			finish();
+		});
+	}
+
+	@Override
+	public void contactExchangeFailed() {
+		runOnUiThreadUnlessDestroyed(() -> {
+			Toast.makeText(ContactExchangeActivity.this,
+					string.contact_exchange_failed, LENGTH_LONG).show();
+			finish();
+		});
+	}
+
+	@UiThread
+	@Override
+	public void keyAgreementFailed() {
+		// TODO show failure somewhere persistent?
+		Toast.makeText(this, R.string.connection_failed,
+				LENGTH_LONG).show();
+	}
+
+	@UiThread
+	@Override
+	public String keyAgreementWaiting() {
+		return getString(R.string.waiting_for_contact_to_scan);
+	}
+
+	@UiThread
+	@Override
+	public String keyAgreementStarted() {
+		return getString(R.string.authenticating_with_device);
+	}
+
+	@UiThread
+	@Override
+	public String keyAgreementAborted(boolean remoteAborted) {
+		// TODO show abort somewhere persistent?
+		Toast.makeText(this,
+				remoteAborted ? R.string.connection_aborted_remote :
+						R.string.connection_aborted_local, LENGTH_LONG)
+				.show();
+		return null;
+	}
+
+	@UiThread
+	@Override
+	public String keyAgreementFinished(KeyAgreementResult result) {
+		startContactExchange(result);
+		return getString(string.exchanging_contact_details);
+	}
+}

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

@@ -16,17 +16,7 @@ import android.support.v7.widget.Toolbar;
 import android.view.MenuItem;
 import android.widget.Toast;
 
-import org.briarproject.bramble.api.contact.ContactExchangeListener;
-import org.briarproject.bramble.api.contact.ContactExchangeTask;
-import org.briarproject.bramble.api.db.DbException;
-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.Author;
-import org.briarproject.bramble.api.identity.IdentityManager;
-import org.briarproject.bramble.api.identity.LocalAuthor;
-import org.briarproject.bramble.api.keyagreement.KeyAgreementResult;
-import org.briarproject.bramble.api.keyagreement.event.KeyAgreementFinishedEvent;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.plugin.event.BluetoothEnabledEvent;
@@ -53,15 +43,14 @@ import static android.bluetooth.BluetoothAdapter.STATE_ON;
 import static android.content.pm.PackageManager.PERMISSION_GRANTED;
 import static android.os.Build.VERSION.SDK_INT;
 import static android.widget.Toast.LENGTH_LONG;
-import static java.util.logging.Level.WARNING;
 import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_ENABLE_BLUETOOTH;
 import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_PERMISSION_CAMERA;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
-public class KeyAgreementActivity extends BriarActivity implements
-		BaseFragmentListener, IntroScreenSeenListener, EventListener,
-		ContactExchangeListener {
+public abstract class KeyAgreementActivity extends BriarActivity implements
+		BaseFragmentListener, IntroScreenSeenListener,
+		KeyAgreementFragment.KeyAgreementEventListener {
 
 	private enum BluetoothState {
 		UNKNOWN, NO_ADAPTER, WAITING, REFUSED, ENABLED
@@ -73,12 +62,6 @@ public class KeyAgreementActivity extends BriarActivity implements
 	@Inject
 	EventBus eventBus;
 
-	// Fields that are accessed from background threads must be volatile
-	@Inject
-	volatile ContactExchangeTask contactExchangeTask;
-	@Inject
-	volatile IdentityManager identityManager;
-
 	private boolean isResumed = false, enableWasRequested = false;
 	private boolean continueClicked, gotCameraPermission;
 	private BluetoothState bluetoothState = BluetoothState.UNKNOWN;
@@ -94,13 +77,9 @@ public class KeyAgreementActivity extends BriarActivity implements
 	public void onCreate(@Nullable Bundle state) {
 		super.onCreate(state);
 		setContentView(R.layout.activity_fragment_container_toolbar);
-
 		Toolbar toolbar = findViewById(R.id.toolbar);
-
 		setSupportActionBar(toolbar);
 		getSupportActionBar().setDisplayHomeAsUpEnabled(true);
-
-		getSupportActionBar().setTitle(R.string.add_contact_title);
 		if (state == null) {
 			showInitialFragment(IntroFragment.newInstance());
 		}
@@ -115,18 +94,6 @@ public class KeyAgreementActivity extends BriarActivity implements
 		if (bluetoothReceiver != null) unregisterReceiver(bluetoothReceiver);
 	}
 
-	@Override
-	public void onStart() {
-		super.onStart();
-		eventBus.addListener(this);
-	}
-
-	@Override
-	protected void onStop() {
-		super.onStop();
-		eventBus.removeListener(this);
-	}
-
 	@Override
 	public boolean onOptionsItemSelected(MenuItem item) {
 		switch (item.getItemId()) {
@@ -147,7 +114,7 @@ public class KeyAgreementActivity extends BriarActivity implements
 		if (canShowQrCodeFragment()) showQrCodeFragment();
 	}
 
-	boolean canShowQrCodeFragment() {
+	private boolean canShowQrCodeFragment() {
 		return isResumed && continueClicked
 				&& (SDK_INT < 23 || gotCameraPermission)
 				&& bluetoothState != BluetoothState.UNKNOWN
@@ -206,10 +173,11 @@ public class KeyAgreementActivity extends BriarActivity implements
 	}
 
 	private void showQrCodeFragment() {
+		continueClicked = false;
 		// FIXME #824
 		FragmentManager fm = getSupportFragmentManager();
-		if (fm.findFragmentByTag(ShowQrCodeFragment.TAG) == null) {
-			BaseFragment f = ShowQrCodeFragment.newInstance();
+		if (fm.findFragmentByTag(KeyAgreementFragment.TAG) == null) {
+			BaseFragment f = KeyAgreementFragment.newInstance();
 			fm.beginTransaction()
 					.replace(R.id.fragmentContainer, f, f.getUniqueTag())
 					.addToBackStack(f.getUniqueTag())
@@ -279,69 +247,6 @@ public class KeyAgreementActivity extends BriarActivity implements
 		}
 	}
 
-	@Override
-	public void eventOccurred(Event e) {
-		if (e instanceof KeyAgreementFinishedEvent) {
-			KeyAgreementFinishedEvent event = (KeyAgreementFinishedEvent) e;
-			keyAgreementFinished(event.getResult());
-		}
-	}
-
-	private void keyAgreementFinished(KeyAgreementResult result) {
-		runOnUiThreadUnlessDestroyed(() -> startContactExchange(result));
-	}
-
-	private void startContactExchange(KeyAgreementResult result) {
-		runOnDbThread(() -> {
-			LocalAuthor localAuthor;
-			// Load the local pseudonym
-			try {
-				localAuthor = identityManager.getLocalAuthor();
-			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
-				contactExchangeFailed();
-				return;
-			}
-
-			// Exchange contact details
-			contactExchangeTask.startExchange(KeyAgreementActivity.this,
-					localAuthor, result.getMasterKey(),
-					result.getConnection(), result.getTransportId(),
-					result.wasAlice());
-		});
-	}
-
-	@Override
-	public void contactExchangeSucceeded(Author remoteAuthor) {
-		runOnUiThreadUnlessDestroyed(() -> {
-			String contactName = remoteAuthor.getName();
-			String format = getString(string.contact_added_toast);
-			String text = String.format(format, contactName);
-			Toast.makeText(KeyAgreementActivity.this, text, LENGTH_LONG).show();
-			supportFinishAfterTransition();
-		});
-	}
-
-	@Override
-	public void duplicateContact(Author remoteAuthor) {
-		runOnUiThreadUnlessDestroyed(() -> {
-			String contactName = remoteAuthor.getName();
-			String format = getString(string.contact_already_exists);
-			String text = String.format(format, contactName);
-			Toast.makeText(KeyAgreementActivity.this, text, LENGTH_LONG).show();
-			finish();
-		});
-	}
-
-	@Override
-	public void contactExchangeFailed() {
-		runOnUiThreadUnlessDestroyed(() -> {
-			Toast.makeText(KeyAgreementActivity.this,
-					string.contact_exchange_failed, LENGTH_LONG).show();
-			finish();
-		});
-	}
-
 	private class BluetoothStateReceiver extends BroadcastReceiver {
 
 		@Override

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

@@ -2,18 +2,12 @@ package org.briarproject.briar.android.keyagreement;
 
 import android.content.Context;
 import android.graphics.Bitmap;
-import android.hardware.Camera;
-import android.os.AsyncTask;
 import android.os.Bundle;
 import android.support.annotation.UiThread;
 import android.util.DisplayMetrics;
-import android.view.Display;
 import android.view.LayoutInflater;
-import android.view.Surface;
 import android.view.View;
 import android.view.ViewGroup;
-import android.view.animation.AlphaAnimation;
-import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.LinearLayout.LayoutParams;
 import android.widget.TextView;
@@ -24,6 +18,7 @@ import com.google.zxing.Result;
 import org.briarproject.bramble.api.UnsupportedVersionException;
 import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.event.EventBus;
+import org.briarproject.bramble.api.keyagreement.KeyAgreementResult;
 import org.briarproject.bramble.api.keyagreement.KeyAgreementTask;
 import org.briarproject.bramble.api.keyagreement.Payload;
 import org.briarproject.bramble.api.keyagreement.PayloadEncoder;
@@ -36,11 +31,13 @@ import org.briarproject.bramble.api.keyagreement.event.KeyAgreementStartedEvent;
 import org.briarproject.bramble.api.keyagreement.event.KeyAgreementWaitingEvent;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 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.BaseEventFragment;
 import org.briarproject.briar.android.fragment.ErrorFragment;
+import org.briarproject.briar.android.view.QrCodeView;
 
 import java.io.IOException;
 import java.nio.charset.Charset;
@@ -59,13 +56,14 @@ import static android.widget.LinearLayout.HORIZONTAL;
 import static android.widget.Toast.LENGTH_LONG;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
-public class ShowQrCodeFragment extends BaseEventFragment
-		implements QrCodeDecoder.ResultCallback {
+public class KeyAgreementFragment extends BaseEventFragment
+		implements QrCodeDecoder.ResultCallback, QrCodeView.FullscreenListener {
 
-	static final String TAG = ShowQrCodeFragment.class.getName();
+	static final String TAG = KeyAgreementFragment.class.getName();
 
 	private static final Logger LOG = Logger.getLogger(TAG);
 	private static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");
@@ -83,26 +81,29 @@ public class ShowQrCodeFragment extends BaseEventFragment
 	EventBus eventBus;
 
 	private CameraView cameraView;
+	private LinearLayout cameraOverlay;
 	private View statusView;
+	private QrCodeView qrCodeView;
 	private TextView status;
-	private ImageView qrCode;
-	private TextView mainProgressTitle;
-	private ViewGroup mainProgressContainer;
-	private boolean fullscreen = false;
 
 	private boolean gotRemotePayload;
 	private volatile boolean gotLocalPayload;
 	private KeyAgreementTask task;
+	private KeyAgreementEventListener listener;
 
-	public static ShowQrCodeFragment newInstance() {
-
+	public static KeyAgreementFragment newInstance() {
 		Bundle args = new Bundle();
-
-		ShowQrCodeFragment fragment = new ShowQrCodeFragment();
+		KeyAgreementFragment fragment = new KeyAgreementFragment();
 		fragment.setArguments(args);
 		return fragment;
 	}
 
+	@Override
+	public void onAttach(Context context) {
+		super.onAttach(context);
+		listener = (KeyAgreementEventListener) context;
+	}
+
 	@Override
 	public void injectFragment(ActivityComponent component) {
 		component.inject(this);
@@ -118,7 +119,6 @@ public class ShowQrCodeFragment extends BaseEventFragment
 	public View onCreateView(LayoutInflater inflater,
 			@Nullable ViewGroup container,
 			@Nullable Bundle savedInstanceState) {
-
 		return inflater.inflate(R.layout.fragment_keyagreement_qr, container,
 				false);
 	}
@@ -126,47 +126,17 @@ public class ShowQrCodeFragment extends BaseEventFragment
 	@Override
 	public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
 		super.onViewCreated(view, savedInstanceState);
-
 		cameraView = view.findViewById(R.id.camera_view);
+		cameraOverlay = view.findViewById(R.id.camera_overlay);
 		statusView = view.findViewById(R.id.status_container);
 		status = view.findViewById(R.id.connect_status);
-		qrCode = view.findViewById(R.id.qr_code);
-		mainProgressTitle = view.findViewById(R.id.title_progress_bar);
-		mainProgressContainer = view.findViewById(R.id.container_progress);
-		ImageView fullscreenButton = view.findViewById(R.id.fullscreen_button);
-		fullscreenButton.setOnClickListener(v -> {
-			View qrCodeContainer = view.findViewById(R.id.qr_code_container);
-			LinearLayout cameraOverlay = view.findViewById(R.id.camera_overlay);
-			LayoutParams statusParams, qrCodeParams;
-			if (fullscreen) {
-				// Shrink the QR code container to fill half its parent
-				if (cameraOverlay.getOrientation() == HORIZONTAL) {
-					statusParams = new LayoutParams(0, MATCH_PARENT, 1f);
-					qrCodeParams = new LayoutParams(0, MATCH_PARENT, 1f);
-				} else {
-					statusParams = new LayoutParams(MATCH_PARENT, 0, 1f);
-					qrCodeParams = new LayoutParams(MATCH_PARENT, 0, 1f);
-				}
-				fullscreenButton.setImageResource(
-						R.drawable.ic_fullscreen_black_48dp);
-			} else {
-				// Grow the QR code container to fill its parent
-				statusParams = new LayoutParams(0, 0, 0f);
-				qrCodeParams = new LayoutParams(MATCH_PARENT, MATCH_PARENT, 1f);
-				fullscreenButton.setImageResource(
-						R.drawable.ic_fullscreen_exit_black_48dp);
-			}
-			statusView.setLayoutParams(statusParams);
-			qrCodeContainer.setLayoutParams(qrCodeParams);
-			cameraOverlay.invalidate();
-			fullscreen = !fullscreen;
-		});
+		qrCodeView = view.findViewById(R.id.qr_code_view);
+		qrCodeView.setFullscreenListener(this);
 	}
 
 	@Override
 	public void onActivityCreated(@Nullable Bundle savedInstanceState) {
 		super.onActivityCreated(savedInstanceState);
-
 		getActivity().setRequestedOrientation(SCREEN_ORIENTATION_NOSENSOR);
 		cameraView.setPreviewConsumer(new QrCodeDecoder(this));
 	}
@@ -175,30 +145,33 @@ public class ShowQrCodeFragment extends BaseEventFragment
 	public void onStart() {
 		super.onStart();
 		try {
-			cameraView.start(getScreenRotationDegrees());
+			cameraView.start();
 		} catch (CameraException e) {
 			logCameraExceptionAndFinish(e);
 		}
 		startListening();
 	}
 
-	/**
-	 * See {@link Camera#setDisplayOrientation(int)}.
-	 */
-	private int getScreenRotationDegrees() {
-		Display d = getActivity().getWindowManager().getDefaultDisplay();
-		switch (d.getRotation()) {
-			case Surface.ROTATION_0:
-				return 0;
-			case Surface.ROTATION_90:
-				return 90;
-			case Surface.ROTATION_180:
-				return 180;
-			case Surface.ROTATION_270:
-				return 270;
-			default:
-				throw new AssertionError();
+	@Override
+	public void setFullscreen(boolean fullscreen) {
+		LinearLayout.LayoutParams statusParams, qrCodeParams;
+		if (fullscreen) {
+			// Grow the QR code view to fill its parent
+			statusParams = new LayoutParams(0, 0, 0f);
+			qrCodeParams = new LayoutParams(MATCH_PARENT, MATCH_PARENT, 1f);
+		} else {
+			// Shrink the QR code view to fill half its parent
+			if (cameraOverlay.getOrientation() == HORIZONTAL) {
+				statusParams = new LayoutParams(0, MATCH_PARENT, 1f);
+				qrCodeParams = new LayoutParams(0, MATCH_PARENT, 1f);
+			} else {
+				statusParams = new LayoutParams(MATCH_PARENT, 0, 1f);
+				qrCodeParams = new LayoutParams(MATCH_PARENT, 0, 1f);
+			}
 		}
+		statusView.setLayoutParams(statusParams);
+		qrCodeView.setLayoutParams(qrCodeParams);
+		cameraOverlay.invalidate();
 	}
 
 	@Override
@@ -214,7 +187,7 @@ public class ShowQrCodeFragment extends BaseEventFragment
 
 	@UiThread
 	private void logCameraExceptionAndFinish(CameraException e) {
-		if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+		logException(LOG, WARNING, e);
 		Toast.makeText(getActivity(), R.string.camera_error,
 				LENGTH_LONG).show();
 		finish();
@@ -244,7 +217,7 @@ public class ShowQrCodeFragment extends BaseEventFragment
 		// If we've stopped the camera view, restart it
 		if (gotRemotePayload) {
 			try {
-				cameraView.start(getScreenRotationDegrees());
+				cameraView.start();
 			} catch (CameraException e) {
 				logCameraExceptionAndFinish(e);
 				return;
@@ -278,7 +251,7 @@ public class ShowQrCodeFragment extends BaseEventFragment
 		} catch (CameraException e) {
 			logCameraExceptionAndFinish(e);
 		} catch (IOException | IllegalArgumentException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, "QR Code Invalid", e);
+			LOG.log(WARNING, "QR Code Invalid", e);
 			reset();
 			Toast.makeText(getActivity(), R.string.qr_code_invalid,
 					LENGTH_LONG).show();
@@ -301,82 +274,60 @@ public class ShowQrCodeFragment extends BaseEventFragment
 			KeyAgreementAbortedEvent event = (KeyAgreementAbortedEvent) e;
 			keyAgreementAborted(event.didRemoteAbort());
 		} else if (e instanceof KeyAgreementFinishedEvent) {
-			runOnUiThreadUnlessDestroyed(() -> {
-				mainProgressContainer.setVisibility(VISIBLE);
-				mainProgressTitle.setText(R.string.exchanging_contact_details);
-			});
+			keyAgreementFinished(((KeyAgreementFinishedEvent) e).getResult());
 		}
 	}
 
-	@UiThread
-	private void generateBitmapQR(Payload payload) {
-		// Get narrowest screen dimension
-		Context context = getContext();
-		if (context == null) return;
-		DisplayMetrics dm = context.getResources().getDisplayMetrics();
-		new AsyncTask<Void, Void, Bitmap>() {
-
-			@Override
-			@Nullable
-			protected Bitmap doInBackground(Void... params) {
-				byte[] payloadBytes = payloadEncoder.encode(payload);
-				if (LOG.isLoggable(INFO)) {
-					LOG.info("Local payload is " + payloadBytes.length
-							+ " bytes");
-				}
-				// Use ISO 8859-1 to encode bytes directly as a string
-				String content = new String(payloadBytes, ISO_8859_1);
-				return QrCodeUtils.createQrCode(dm, content);
-			}
-
-			@Override
-			protected void onPostExecute(@Nullable Bitmap bitmap) {
-				if (bitmap != null && !isDetached()) {
-					qrCode.setImageBitmap(bitmap);
-					// Simple fade-in animation
-					AlphaAnimation anim = new AlphaAnimation(0.0f, 1.0f);
-					anim.setDuration(200);
-					qrCode.startAnimation(anim);
-				}
-			}
-		}.execute();
-	}
-
-	private void setQrCode(Payload localPayload) {
-		runOnUiThreadUnlessDestroyed(() -> generateBitmapQR(localPayload));
-	}
-
 	private void keyAgreementFailed() {
 		runOnUiThreadUnlessDestroyed(() -> {
 			reset();
-			// TODO show failure somewhere persistent?
-			Toast.makeText(getActivity(), R.string.connection_failed,
-					LENGTH_LONG).show();
+			listener.keyAgreementFailed();
 		});
 	}
 
 	private void keyAgreementWaiting() {
 		runOnUiThreadUnlessDestroyed(
-				() -> status.setText(R.string.waiting_for_contact_to_scan));
+				() -> status.setText(listener.keyAgreementWaiting()));
 	}
 
 	private void keyAgreementStarted() {
 		runOnUiThreadUnlessDestroyed(() -> {
-			mainProgressContainer.setVisibility(VISIBLE);
-			mainProgressTitle.setText(R.string.authenticating_with_device);
+			qrCodeView.setVisibility(INVISIBLE);
+			statusView.setVisibility(VISIBLE);
+			status.setText(listener.keyAgreementStarted());
 		});
 	}
 
 	private void keyAgreementAborted(boolean remoteAborted) {
 		runOnUiThreadUnlessDestroyed(() -> {
 			reset();
-			mainProgressContainer.setVisibility(INVISIBLE);
-			mainProgressTitle.setText("");
-			// TODO show abort somewhere persistent?
-			Toast.makeText(getActivity(),
-					remoteAborted ? R.string.connection_aborted_remote :
-							R.string.connection_aborted_local, LENGTH_LONG)
-					.show();
+			qrCodeView.setVisibility(VISIBLE);
+			statusView.setVisibility(INVISIBLE);
+			status.setText(listener.keyAgreementAborted(remoteAborted));
+		});
+	}
+
+	private void keyAgreementFinished(KeyAgreementResult result) {
+		runOnUiThreadUnlessDestroyed(() -> {
+			statusView.setVisibility(VISIBLE);
+			status.setText(listener.keyAgreementFinished(result));
+		});
+	}
+
+	private void setQrCode(Payload localPayload) {
+		Context context = getContext();
+		if (context == null) return;
+		DisplayMetrics dm = context.getResources().getDisplayMetrics();
+		ioExecutor.execute(() -> {
+			byte[] payloadBytes = payloadEncoder.encode(localPayload);
+			if (LOG.isLoggable(INFO)) {
+				LOG.info("Local payload is " + payloadBytes.length
+						+ " bytes");
+			}
+			// Use ISO 8859-1 to encode bytes directly as a string
+			String content = new String(payloadBytes, ISO_8859_1);
+			Bitmap qrCode = QrCodeUtils.createQrCode(dm, content);
+			runOnUiThreadUnlessDestroyed(() -> qrCodeView.setQrCode(qrCode));
 		});
 	}
 
@@ -394,4 +345,31 @@ public class ShowQrCodeFragment extends BaseEventFragment
 	protected void finish() {
 		getActivity().getSupportFragmentManager().popBackStack();
 	}
+
+	@NotNullByDefault
+	interface KeyAgreementEventListener {
+
+		@UiThread
+		void keyAgreementFailed();
+
+		// Should return a string to be displayed as status.
+		@UiThread
+		@Nullable
+		String keyAgreementWaiting();
+
+		// Should return a string to be displayed as status.
+		@UiThread
+		@Nullable
+		String keyAgreementStarted();
+
+		// Should return a string to be displayed as status.
+		@UiThread
+		@Nullable
+		String keyAgreementAborted(boolean remoteAborted);
+
+		// Should return a string to be displayed as status.
+		@UiThread
+		@Nullable
+		String keyAgreementFinished(KeyAgreementResult result);
+	}
 }

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

@@ -18,6 +18,7 @@ import static android.graphics.Color.BLACK;
 import static android.graphics.Color.WHITE;
 import static com.google.zxing.BarcodeFormat.QR_CODE;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @NotNullByDefault
 class QrCodeUtils {
@@ -34,7 +35,7 @@ class QrCodeUtils {
 					smallestDimen, smallestDimen);
 			return renderQrCode(encoded);
 		} catch (WriterException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+			logException(LOG, WARNING, e);
 			return null;
 		}
 	}

briar-android/src/main/java/org/briarproject/briar/android/logging/BriefLogFormatter.java

@@ -42,6 +42,22 @@ public class BriefLogFormatter extends Formatter {
 		tag = tag.substring(tag.lastIndexOf('.') + 1);
 		sb.append(tag).append(": ");
 		sb.append(record.getMessage());
+		Throwable t = record.getThrown();
+		if (t != null) {
+			sb.append('\n');
+			appendThrowable(sb, t);
+		}
 		return sb.toString();
 	}
+
+	private void appendThrowable(StringBuilder sb, Throwable t) {
+		sb.append(t);
+		for (StackTraceElement e : t.getStackTrace())
+			sb.append("\n        at ").append(e);
+		Throwable cause = t.getCause();
+		if (cause != null) {
+			sb.append("\n     Caused by: ");
+			appendThrowable(sb, cause);
+		}
+	}
 }

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

@@ -16,6 +16,8 @@ import java.util.List;
 
 import javax.annotation.Nullable;
 
+import static android.os.Build.VERSION.SDK_INT;
+
 @UiThread
 @NotNullByDefault
 class HuaweiView extends PowerView {
@@ -45,6 +47,8 @@ class HuaweiView extends PowerView {
 	}
 
 	public static boolean needsToBeShown(Context context) {
+		// "Protected apps" no longer exists on Huawei EMUI 5.0 (Android 7.0)
+		if (SDK_INT >= 24) return false;
 		PackageManager pm = context.getPackageManager();
 		List<ResolveInfo> resolveInfos = pm.queryIntentActivities(getIntent(),
 				PackageManager.MATCH_DEFAULT_ONLY);

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

@@ -13,6 +13,7 @@ import android.widget.EditText;
 import android.widget.ProgressBar;
 
 import org.briarproject.briar.R;
+import org.briarproject.briar.android.Localizer;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BaseActivity;
 import org.briarproject.briar.android.controller.BriarController;
@@ -105,6 +106,8 @@ public class PasswordActivity extends BaseActivity {
 
 	private void deleteAccount() {
 		passwordController.deleteAccount(this);
+		Localizer.reinitialize();
+		UiUtils.setTheme(this, getString(R.string.pref_theme_light_value));
 		setResult(RESULT_CANCELED);
 		Intent i = new Intent(this, SetupActivity.class);
 		i.setFlags(FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_CLEAR_TASK);

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

@@ -17,7 +17,8 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
-import static java.util.logging.Level.INFO;
+import static org.briarproject.bramble.util.LogUtils.logDuration;
+import static org.briarproject.bramble.util.LogUtils.now;
 
 @NotNullByDefault
 public class PasswordControllerImpl extends ConfigControllerImpl
@@ -86,11 +87,9 @@ public class PasswordControllerImpl extends ConfigControllerImpl
 
 	@CryptoExecutor
 	String encryptDatabaseKey(SecretKey key, String password) {
-		long now = System.currentTimeMillis();
+		long start = now();
 		byte[] encrypted = crypto.encryptWithPassword(key.getBytes(), password);
-		long duration = System.currentTimeMillis() - now;
-		if (LOG.isLoggable(INFO))
-			LOG.info("Key derivation took " + duration + " ms");
+		logDuration(LOG, "Key derivation", start);
 		return StringUtils.toHexString(encrypted);
 	}
 }

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

@@ -15,6 +15,7 @@ import javax.annotation.Nullable;
 import javax.inject.Inject;
 
 import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
+import static android.content.Intent.FLAG_ACTIVITY_TASK_ON_HOME;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -94,7 +95,7 @@ public class SetupActivity extends BaseActivity
 
 	void showApp() {
 		Intent i = new Intent(this, OpenDatabaseActivity.class);
-		i.setFlags(FLAG_ACTIVITY_NEW_TASK);
+		i.setFlags(FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_TASK_ON_HOME);
 		startActivity(i);
 		supportFinishAfterTransition();
 		overridePendingTransition(R.anim.screen_new_in, R.anim.screen_old_out);

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

@@ -68,6 +68,7 @@ public class NavDrawerActivity extends BriarActivity implements
 	public static final String INTENT_GROUPS = "intent_groups";
 	public static final String INTENT_FORUMS = "intent_forums";
 	public static final String INTENT_BLOGS = "intent_blogs";
+	public static final String INTENT_SIGN_OUT = "intent_sign_out";
 
 	private static final Logger LOG =
 			Logger.getLogger(NavDrawerActivity.class.getName());
@@ -99,6 +100,8 @@ public class NavDrawerActivity extends BriarActivity implements
 					R.id.nav_btn_contacts);
 		} else if (intent.getBooleanExtra(INTENT_BLOGS, false)) {
 			startFragment(FeedFragment.newInstance(), R.id.nav_btn_blogs);
+		} else if (intent.getBooleanExtra(INTENT_SIGN_OUT, false)) {
+			signOut(false);
 		}
 		setIntent(null);
 	}
@@ -225,12 +228,12 @@ public class NavDrawerActivity extends BriarActivity implements
 				finish();
 			} else if (fm.getBackStackEntryCount() == 0
 					&& fm.findFragmentByTag(ContactListFragment.TAG) == null) {
-			/*
-			 * This makes sure that the first fragment (ContactListFragment) the
-			 * user sees is the same as the last fragment the user sees before
-			 * exiting. This models the typical Google navigation behaviour such
-			 * as in Gmail/Inbox.
-			 */
+				/*
+				 * This makes sure that the first fragment (ContactListFragment) the
+				 * user sees is the same as the last fragment the user sees before
+				 * exiting. This models the typical Google navigation behaviour such
+				 * as in Gmail/Inbox.
+				 */
 				startFragment(ContactListFragment.newInstance(),
 						R.id.nav_btn_contacts);
 			} else {

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

@@ -28,6 +28,7 @@ import javax.inject.Inject;
 
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.briar.android.TestingConstants.EXPIRY_DATE;
 import static org.briarproject.briar.android.TestingConstants.IS_BETA_BUILD;
 import static org.briarproject.briar.android.TestingConstants.IS_DEBUG_BUILD;
@@ -143,7 +144,7 @@ public class NavDrawerControllerImpl extends DbControllerImpl
 					}
 				}
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -158,7 +159,7 @@ public class NavDrawerControllerImpl extends DbControllerImpl
 				settings.putBoolean(EXPIRY_SHOW_UPDATE, false);
 				settingsManager.mergeSettings(settings, SETTINGS_NAMESPACE);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -178,8 +179,7 @@ public class NavDrawerControllerImpl extends DbControllerImpl
 				boolean ask = settings.getBoolean(DOZE_ASK_AGAIN, true);
 				handler.onResult(ask);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING))
-					LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onResult(true);
 			}
 		});

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

@@ -42,6 +42,7 @@ import javax.inject.Inject;
 
 import static java.lang.Math.max;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -152,7 +153,7 @@ class GroupControllerImpl extends
 				}
 				handler.onResult(contactIds);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});
@@ -176,7 +177,7 @@ class GroupControllerImpl extends
 				createMessage(body, timestamp, parentId, author, previousMsgId,
 						handler);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});
@@ -223,7 +224,7 @@ class GroupControllerImpl extends
 				LocalAuthor author = identityManager.getLocalAuthor();
 				handler.onResult(author);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});
@@ -238,7 +239,7 @@ class GroupControllerImpl extends
 						privateGroupManager.isDissolved(getGroupId());
 				handler.onResult(isDissolved);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});

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

@@ -33,6 +33,7 @@ import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 @Immutable
 @NotNullByDefault
@@ -81,7 +82,7 @@ class CreateGroupControllerImpl extends ContactSelectorControllerImpl
 				LocalAuthor author = identityManager.getLocalAuthor();
 				createGroupAndMessages(author, name, handler);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});
@@ -109,7 +110,7 @@ class CreateGroupControllerImpl extends ContactSelectorControllerImpl
 				groupManager.addPrivateGroup(group, joinMsg, true);
 				handler.onResult(group.getId());
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});
@@ -136,7 +137,7 @@ class CreateGroupControllerImpl extends ContactSelectorControllerImpl
 				}
 				signInvitations(g, localAuthor, contacts, message, handler);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});
@@ -176,7 +177,7 @@ class CreateGroupControllerImpl extends ContactSelectorControllerImpl
 				//noinspection ConstantConditions
 				handler.onResult(null);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});

briar-android/src/main/java/org/briarproject/briar/android/privategroup/invitation/GroupInvitationControllerImpl.java

@@ -22,6 +22,7 @@ import java.util.concurrent.Executor;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.briar.api.privategroup.PrivateGroupManager.CLIENT_ID;
 
 @NotNullByDefault
@@ -72,7 +73,7 @@ class GroupInvitationControllerImpl
 				ContactId c = item.getCreator().getId();
 				groupInvitationManager.respondToInvitation(c, g, accept);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});

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

@@ -36,8 +36,10 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
-import static java.util.logging.Level.INFO;
 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.privategroup.PrivateGroupManager.CLIENT_ID;
 
 @MethodsNotNullByDefault
@@ -147,7 +149,7 @@ class GroupListControllerImpl extends DbControllerImpl
 			ResultExceptionHandler<Collection<GroupItem>, DbException> handler) {
 		runOnDbThread(() -> {
 			try {
-				long now = System.currentTimeMillis();
+				long start = now();
 				Collection<PrivateGroup> groups =
 						groupManager.getPrivateGroups();
 				List<GroupItem> items = new ArrayList<>(groups.size());
@@ -161,12 +163,10 @@ class GroupListControllerImpl extends DbControllerImpl
 						// Continue
 					}
 				}
-				long duration = System.currentTimeMillis() - now;
-				if (LOG.isLoggable(INFO))
-					LOG.info("Loading groups took " + duration + " ms");
+				logDuration(LOG, "Loading groups", start);
 				handler.onResult(items);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});
@@ -176,13 +176,11 @@ class GroupListControllerImpl extends DbControllerImpl
 	public void removeGroup(GroupId g, ExceptionHandler<DbException> handler) {
 		runOnDbThread(() -> {
 			try {
-				long now = System.currentTimeMillis();
+				long start = now();
 				groupManager.removePrivateGroup(g);
-				long duration = System.currentTimeMillis() - now;
-				if (LOG.isLoggable(INFO))
-					LOG.info("Removing group took " + duration + " ms");
+				logDuration(LOG, "Removing group", start);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});
@@ -196,7 +194,7 @@ class GroupListControllerImpl extends DbControllerImpl
 				handler.onResult(
 						groupInvitationManager.getInvitations().size());
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});

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

@@ -16,7 +16,6 @@ import org.briarproject.briar.android.privategroup.conversation.GroupActivity;
 import org.briarproject.briar.android.util.UiUtils;
 import org.briarproject.briar.android.view.TextAvatarView;
 
-import static android.support.v4.content.ContextCompat.getColor;
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
@@ -83,8 +82,6 @@ class GroupViewHolder extends RecyclerView.ViewHolder {
 				postCount.setText(ctx.getResources()
 						.getQuantityString(R.plurals.messages, messageCount,
 								messageCount));
-				postCount.setTextColor(
-						getColor(ctx, R.color.briar_text_secondary));
 
 				long lastUpdate = group.getTimestamp();
 				date.setText(UiUtils.formatDate(ctx, lastUpdate));

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

@@ -19,6 +19,7 @@ import java.util.logging.Logger;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 
 class GroupMemberListControllerImpl extends DbControllerImpl
 		implements GroupMemberListController {
@@ -56,7 +57,7 @@ class GroupMemberListControllerImpl extends DbControllerImpl
 				}
 				handler.onResult(items);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});

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

@@ -28,6 +28,7 @@ import javax.inject.Inject;
 
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
+import static org.briarproject.bramble.util.LogUtils.logException;
 import static org.briarproject.briar.android.settings.SettingsFragment.SETTINGS_NAMESPACE;
 import static org.briarproject.briar.api.privategroup.Visibility.INVISIBLE;
 
@@ -65,7 +66,7 @@ class RevealContactsControllerImpl extends DbControllerImpl
 			try {
 				handler.onResult(getItems(g, selection));
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 		});
@@ -106,7 +107,7 @@ class RevealContactsControllerImpl extends DbControllerImpl
 						settings.getBoolean(SHOW_ONBOARDING_REVEAL_CONTACTS,
 								true));
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 				handler.onException(e);
 			}
 
@@ -121,8 +122,7 @@ class RevealContactsControllerImpl extends DbControllerImpl
 				settings.putBoolean(SHOW_ONBOARDING_REVEAL_CONTACTS, false);
 				settingsManager.mergeSettings(settings, SETTINGS_NAMESPACE);
 			} catch (DbException e) {
-				if (LOG.isLoggable(WARNING))
-					LOG.log(WARNING, e.toString(), e);
+				logException(LOG, WARNING, e);
 			}
 		});
 	}
@@ -136,11 +136,9 @@ class RevealContactsControllerImpl extends DbControllerImpl
 					groupInvitationManager.revealRelationship(c, g);
 				} catch (ProtocolStateException e) {
 					// action is outdated, move to next contact
-					if (LOG.isLoggable(INFO))
-						LOG.log(INFO, e.toString(), e);
+					logException(LOG, INFO, e);
 				} catch (DbException e) {
-					if (LOG.isLoggable(WARNING))
-						LOG.log(WARNING, e.toString(), e);
+					logException(LOG, WARNING, e);
 					handler.onException(e);
 					break;
 				}

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

@@ -3,6 +3,7 @@ package org.briarproject.briar.android.reporting;
 import android.content.res.Configuration;
 import android.os.AsyncTask;
 import android.os.Bundle;
+import android.support.annotation.Nullable;
 import android.support.v7.app.AppCompatDelegate;
 import android.support.v7.widget.Toolbar;
 import android.view.LayoutInflater;
@@ -33,6 +34,7 @@ import java.util.Map.Entry;
 import java.util.Set;
 import java.util.logging.Logger;
 
+import static android.os.Build.VERSION.SDK_INT;
 import static android.view.View.GONE;
 import static android.view.View.INVISIBLE;
 import static android.view.View.VISIBLE;
@@ -83,10 +85,27 @@ public class DevReportActivity extends BaseCrashReportDialog
 	}
 
 	@Override
-	public void onCreate(Bundle state) {
+	protected void preInit(@Nullable Bundle savedInstanceState) {
+		super.preInit(savedInstanceState);
 		getDelegate().installViewFactory();
-		getDelegate().onCreate(state);
-		super.onCreate(state);
+		getDelegate().onCreate(savedInstanceState);
+		if (getDelegate().applyDayNight()) {
+			// If DayNight has been applied, we need to re-apply the theme for
+			// the changes to take effect. On API 23+, we should bypass
+			// setTheme(), which will no-op if the theme ID is identical to the
+			// current theme ID.
+			int theme = R.style.BriarTheme_NoActionBar;
+			if (SDK_INT >= 23) {
+				onApplyThemeResource(getTheme(), theme, false);
+			} else {
+				setTheme(theme);
+			}
+		}
+	}
+
+	@Override
+	public void init(Bundle state) {
+		super.init(state);
 
 		getDelegate().setContentView(R.layout.activity_dev_report);
 
@@ -94,6 +113,7 @@ public class DevReportActivity extends BaseCrashReportDialog
 		getDelegate().setSupportActionBar(tb);
 
 		View requestReport = findViewById(R.id.request_report);
+		View reportForm = findViewById(R.id.report_form);
 		userCommentView = findViewById(R.id.user_comment);
 		userEmailView = findViewById(R.id.user_email);
 		includeDebugReport = findViewById(R.id.include_debug_report);
@@ -111,13 +131,18 @@ public class DevReportActivity extends BaseCrashReportDialog
 		if (isFeedback()) {
 			includeDebugReport
 					.setText(getString(R.string.include_debug_report_feedback));
+			reportForm.setVisibility(VISIBLE);
+			requestReport.setVisibility(INVISIBLE);
 		} else {
 			includeDebugReport.setChecked(true);
+			reportForm.setVisibility(INVISIBLE);
+			requestReport.setVisibility(VISIBLE);
 		}
 
 		findViewById(R.id.acceptButton).setOnClickListener(v -> {
 			reviewing = true;
-			requestReport.setVisibility(GONE);
+			reportForm.setVisibility(VISIBLE);
+			requestReport.setVisibility(INVISIBLE);
 			((InputMethodManager) getSystemService(INPUT_METHOD_SERVICE))
 					.showSoftInput(userCommentView, SHOW_FORCED);
 		});
@@ -165,7 +190,6 @@ public class DevReportActivity extends BaseCrashReportDialog
 		MenuInflater inflater = getDelegate().getMenuInflater();
 		inflater.inflate(R.menu.dev_report_actions, menu);
 		sendReport = menu.findItem(R.id.action_send_report);
-
 		return super.onCreateOptionsMenu(menu);
 	}
 
@@ -258,27 +282,27 @@ public class DevReportActivity extends BaseCrashReportDialog
 				if (crashData != null) {
 					for (Entry<ReportField, String> e : crashData.entrySet()) {
 						ReportField field = e.getKey();
+						String value = e.getValue().replaceAll("\\\\n", "\n");
 						boolean required = requiredFields.contains(field);
 						boolean excluded = excludedFields.contains(field);
 						View v = inflater.inflate(R.layout.list_item_crash,
 								report, false);
-						CheckBox cb = v
-								.findViewById(R.id.include_in_report);
+						CheckBox cb = v.findViewById(R.id.include_in_report);
 						cb.setTag(field);
 						cb.setChecked(required || !excluded);
 						cb.setEnabled(!required);
 						cb.setOnCheckedChangeListener(DevReportActivity.this);
-						((TextView) v.findViewById(R.id.title))
-								.setText(e.getKey().toString());
-						((TextView) v.findViewById(R.id.content))
-								.setText(e.getValue());
+						TextView title = v.findViewById(R.id.title);
+						title.setText(field.toString());
+						TextView content = v.findViewById(R.id.content);
+						content.setText(value);
 						report.addView(v);
 					}
 				} else {
 					View v = inflater.inflate(
 							android.R.layout.simple_list_item_1, report, false);
-					((TextView) v.findViewById(android.R.id.text1))
-							.setText(R.string.could_not_load_report_data);
+					TextView error = v.findViewById(android.R.id.text1);
+					error.setText(R.string.could_not_load_report_data);
 					report.addView(v);
 				}
 				report.setVisibility(VISIBLE);

briar-android/src/main/java/org/briarproject/briar/android/settings/SettingsActivity.java

@@ -36,5 +36,4 @@ public class SettingsActivity extends BriarActivity {
 		}
 		return false;
 	}
-
 }