Bumped version number for beta release.

Prevent NPE in CameraView

Closes #1009 and #997

See merge request !577

.gitlab-ci.yml

@@ -0,0 +1,20 @@
+image: registry.gitlab.com/fdroid/ci-images-base:latest
+
+cache:
+  paths:
+    - .gradle/wrapper
+    - .gradle/caches
+
+before_script:
+  - export GRADLE_USER_HOME=$PWD/.gradle
+#  - export ANDROID_COMPILE_SDK=`sed -n 's,.*compileSdkVersion\s*\([0-9][0-9]*\).*,\1,p' app/build.gradle`
+#  - echo y | android --silent update sdk --no-ui --filter android-${ANDROID_COMPILE_SDK}
+
+test:
+  script:
+    - ./gradlew test
+
+after_script:
+    # this file changes every time but should not be cached
+    - rm -f $GRADLE_USER_HOME/caches/modules-2/modules-2.lock
+    - rm -fr $GRADLE_USER_HOME/caches/*/plugin-resolution/

bramble-android/build.gradle

@@ -12,8 +12,8 @@ android {
 	defaultConfig {
 		minSdkVersion 14
 		targetSdkVersion 22
-		versionCode 1
+		versionCode 14
-		versionName "1.0"
+		versionName "0.14"
 		consumerProguardFiles 'proguard-rules.txt'
 	}
 
@@ -25,38 +25,38 @@ android {
 
 dependencies {
 	compile project(':bramble-core')
-	compile fileTree(dir: 'libs', include: ['*.jar'])
+	compile fileTree(dir: 'libs', include: '*.jar')
 	provided 'javax.annotation:jsr250-api:1.0'
 }
 
 def torBinaryDir = 'src/main/res/raw'
 
 task downloadTorGeoIp(type: Download) {
-	src 'https://briarproject.org/build/geoip-2015-12-01.zip'
+	src 'https://briarproject.org/build/geoip-2017-05-02.zip'
 	dest "$torBinaryDir/geoip.zip"
 	onlyIfNewer true
 }
 
 task downloadTorBinaryArm(type: Download) {
-	src 'https://briarproject.org/build/tor-0.2.7.6-arm.zip'
+	src 'https://briarproject.org/build/tor-0.2.9.11-arm.zip'
 	dest "$torBinaryDir/tor_arm.zip"
 	onlyIfNewer true
 }
 
 task downloadTorBinaryArmPie(type: Download) {
-	src 'https://briarproject.org/build/tor-0.2.7.6-arm-pie.zip'
+	src 'https://briarproject.org/build/tor-0.2.9.11-arm-pie.zip'
 	dest "$torBinaryDir/tor_arm_pie.zip"
 	onlyIfNewer true
 }
 
 task downloadTorBinaryX86(type: Download) {
-	src 'https://briarproject.org/build/tor-0.2.7.6-x86.zip'
+	src 'https://briarproject.org/build/tor-0.2.9.11-x86.zip'
 	dest "$torBinaryDir/tor_x86.zip"
 	onlyIfNewer true
 }
 
 task downloadTorBinaryX86Pie(type: Download) {
-	src 'https://briarproject.org/build/tor-0.2.7.6-x86-pie.zip'
+	src 'https://briarproject.org/build/tor-0.2.9.11-x86-pie.zip'
 	dest "$torBinaryDir/tor_x86_pie.zip"
 	onlyIfNewer true
 }
@@ -64,31 +64,31 @@ task downloadTorBinaryX86Pie(type: Download) {
 task verifyTorGeoIp(type: Verify, dependsOn: 'downloadTorGeoIp') {
 	src "$torBinaryDir/geoip.zip"
 	algorithm 'SHA-256'
-	checksum '9bcdaf0a7ba0933735328d8ec466c25c25dbb459efc2bce9e55c774eabea5162'
+	checksum '51f4d1272fb867e1f3b36b67a584e2a33c40b40f62305457d799fd399cd77c9b'
 }
 
 task verifyTorBinaryArm(type: Verify, dependsOn: 'downloadTorBinaryArm') {
 	src "$torBinaryDir/tor_arm.zip"
 	algorithm 'SHA-256'
-	checksum '83272962eda701cd5d74d2418651c4ff0f0b1dff51f558a292d1a1c42bf12146'
+	checksum '1da6008663a8ad98b349e62acbbf42c379f65ec504fa467cb119c187cd5a4c6b'
 }
 
 task verifyTorBinaryArmPie(type: Verify, dependsOn: 'downloadTorBinaryArmPie') {
 	src "$torBinaryDir/tor_arm_pie.zip"
 	algorithm 'SHA-256'
-	checksum 'd0300d1e45de11ebb24ed62b9c492be9c2e88590b7822195ab38c7a76ffcf646'
+	checksum 'eb061f880829e05f104690ac744848133f2dacef04759d425a2cff0df32c271e'
 }
 
 task verifyTorBinaryX86(type: Verify, dependsOn: 'downloadTorBinaryX86') {
 	src "$torBinaryDir/tor_x86.zip"
 	algorithm 'SHA-256'
-	checksum 'b8813d97b01ee1b9c9a4233c1b9bbe9f9f6b494ae6f9cbd84de8a3911911615e'
+	checksum 'f5308aff8303daca082f82227d02b51ddedba4ab1d1420739ada0427ae5dbb41'
 }
 
 task verifyTorBinaryX86Pie(type: Verify, dependsOn: 'downloadTorBinaryX86Pie') {
 	src "$torBinaryDir/tor_x86_pie.zip"
 	algorithm 'SHA-256'
-	checksum '9c66e765aa196dc089951a1b2140cc8290305c2fcbf365121f99e01a233baf4e'
+	checksum '889a6c81ac73d05d35ed610ca5a913cee44d333e4ae1749c2a107f2f7dd8197b'
 }
 
 project.afterEvaluate {

bramble-api/build.gradle

@@ -7,12 +7,12 @@ apply plugin: 'witness'
 dependencies {
 	compile "com.google.dagger:dagger:2.0.2"
 	compile 'com.google.dagger:dagger-compiler:2.0.2'
-	compile 'com.google.code.findbugs:jsr305:3.0.1'
+	compile 'com.google.code.findbugs:jsr305:3.0.2'
 
 	testCompile 'junit:junit:4.12'
-	testCompile "org.jmock:jmock:2.8.1"
+	testCompile "org.jmock:jmock:2.8.2"
-	testCompile "org.jmock:jmock-junit4:2.8.1"
+	testCompile "org.jmock:jmock-junit4:2.8.2"
-	testCompile "org.jmock:jmock-legacy:2.8.1"
+	testCompile "org.jmock:jmock-legacy:2.8.2"
 	testCompile "org.hamcrest:hamcrest-library:1.3"
 	testCompile "org.hamcrest:hamcrest-core:1.3"
 }
@@ -21,7 +21,7 @@ dependencyVerification {
 	verify = [
 			'com.google.dagger:dagger:84c0282ed8be73a29e0475d639da030b55dee72369e58dd35ae7d4fe6243dcf9',
 			'com.google.dagger:dagger-compiler:b74bc9de063dd4c6400b232231f2ef5056145b8fbecbf5382012007dd1c071b3',
-			'com.google.code.findbugs:jsr305:c885ce34249682bc0236b4a7d56efcc12048e6135a5baf7a9cde8ad8cda13fcd',
+			'com.google.code.findbugs:jsr305:766ad2a0783f2687962c8ad74ceecc38a28b9f72a2d085ee438b7813e928d0c7',
 			'javax.inject:javax.inject:91c77044a50c481636c32d916fd89c9118a72195390452c81065080f957de7ff',
 			'com.google.dagger:dagger-producers:99ec15e8a0507ba569e7655bc1165ee5e5ca5aa914b3c8f7e2c2458f724edd6b',
 			'com.google.guava:guava:d664fbfc03d2e5ce9cab2a44fb01f1d0bf9dfebeccc1a473b1f9ea31f79f6f99',

bramble-api/src/main/java/org/briarproject/bramble/api/Bytes.java

@@ -1,6 +1,7 @@
 package org.briarproject.bramble.api;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.util.StringUtils;
 
 import java.util.Arrays;
 import java.util.Comparator;
@@ -53,6 +54,12 @@ public class Bytes implements Comparable<Bytes> {
 		return aBytes.length - bBytes.length;
 	}
 
+	@Override
+	public String toString() {
+		return getClass().getSimpleName() +
+				"(" + StringUtils.toHexString(getBytes()) + ")";
+	}
+
 	public static class BytesComparator implements Comparator<Bytes> {
 
 		@Override

bramble-api/src/main/java/org/briarproject/bramble/api/crypto/CryptoComponent.java

@@ -137,7 +137,8 @@ public interface CryptoComponent {
 	TransportKeys rotateTransportKeys(TransportKeys k, long rotationPeriod);
 
 	/** Encodes the pseudo-random tag that is used to recognise a stream. */
-	void encodeTag(byte[] tag, SecretKey tagKey, long streamNumber);
+	void encodeTag(byte[] tag, SecretKey tagKey, int protocolVersion,
+			long streamNumber);
 
 	/**
 	 * Signs the given byte[] with the given PrivateKey.

bramble-api/src/main/java/org/briarproject/bramble/api/transport/TransportConstants.java

@@ -4,6 +4,11 @@ import org.briarproject.bramble.api.crypto.SecretKey;
 
 public interface TransportConstants {
 
+	/**
+	 * The current version of the transport protocol.
+	 */
+	int PROTOCOL_VERSION = 3;
+
 	/**
 	 * The length of the pseudo-random tag in bytes.
 	 */
@@ -14,21 +19,22 @@ public interface TransportConstants {
 	 */
 	int STREAM_HEADER_NONCE_LENGTH = 24;
 
-	/**
-	 * The length of the stream header initialisation vector (IV) in bytes.
-	 */
-	int STREAM_HEADER_IV_LENGTH = STREAM_HEADER_NONCE_LENGTH - 8;
-
 	/**
 	 * The length of the message authentication code (MAC) in bytes.
 	 */
 	int MAC_LENGTH = 16;
 
+	/**
+	 * The length of the stream header plaintext in bytes. The stream header
+	 * contains the protocol version, stream number and frame key.
+	 */
+	int STREAM_HEADER_PLAINTEXT_LENGTH = 2 + 8 + SecretKey.LENGTH;
+
 	/**
 	 * The length of the stream header in bytes.
 	 */
-	int STREAM_HEADER_LENGTH = STREAM_HEADER_IV_LENGTH + SecretKey.LENGTH
+	int STREAM_HEADER_LENGTH = STREAM_HEADER_NONCE_LENGTH
-			+ MAC_LENGTH;
+			+ STREAM_HEADER_PLAINTEXT_LENGTH + MAC_LENGTH;
 
 	/**
 	 * The length of the frame nonce in bytes.

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

@@ -19,7 +19,7 @@ public class PrivacyUtils {
 
 	@Nullable
 	public static String scrubMacAddress(@Nullable String address) {
-		if (address == null) return null;
+		if (address == null || address.length() == 0) return null;
 		// this is a fake address we need to know about
 		if (address.equals("02:00:00:00:00:00")) return address;
 		// keep first and last octet of MAC address

bramble-core/build.gradle

@@ -1,8 +1,9 @@
 plugins {
-	id "java"
+	id 'java'
-	id "net.ltgt.apt" version "0.9"
+	id 'net.ltgt.apt' version '0.9'
-	id "idea"
+	id 'idea'
 }
+
 sourceCompatibility = 1.6
 targetCompatibility = 1.6
 
@@ -10,17 +11,18 @@ apply plugin: 'witness'
 
 dependencies {
 	compile project(':bramble-api')
-	compile fileTree(dir: 'libs', include: '*.jar')
+	compile 'com.madgag.spongycastle:core:1.56.0.0'
-	compile 'com.madgag.spongycastle:core:1.54.0.0'
+	compile 'com.h2database:h2:1.4.192' // This is the last version that supports Java 1.6
-	compile 'com.h2database:h2:1.4.190'
+	compile 'org.bitlet:weupnp:0.1.4'
 
 	testCompile project(path: ':bramble-api', configuration: 'testOutput')
 }
 
 dependencyVerification {
 	verify = [
-			'com.madgag.spongycastle:core:1e7fa4b19ccccd1011364ab838d0b4702470c178bbbdd94c5c90b2d4d749ea1e',
+			'com.madgag.spongycastle:core:5e791b0eaa9e0c4594231b44f616a52adddb7dccedeb0ad9ad74887e19499a23',
-			'com.h2database:h2:23ba495a07bbbb3bd6c3084d10a96dad7a23741b8b6d64b213459a784195a98c'
+			'com.h2database:h2:225b22e9857235c46c93861410b60b8c81c10dc8985f4faf188985ba5445126c',
+			'org.bitlet:weupnp:88df7e6504929d00bdb832863761385c68ab92af945b04f0770b126270a444fb',
 	]
 }
 

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

@@ -54,6 +54,7 @@ public class BrambleCoreModule {
 		c.inject(new IdentityModule.EagerSingletons());
 		c.inject(new LifecycleModule.EagerSingletons());
 		c.inject(new PluginModule.EagerSingletons());
+		c.inject(new PropertiesModule.EagerSingletons());
 		c.inject(new SyncModule.EagerSingletons());
 		c.inject(new SystemModule.EagerSingletons());
 		c.inject(new TransportModule.EagerSingletons());

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

@@ -45,8 +45,10 @@ import static org.briarproject.bramble.api.invitation.InvitationConstants.CODE_B
 import static org.briarproject.bramble.api.keyagreement.KeyAgreementConstants.COMMIT_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.TAG_LENGTH;
 import static org.briarproject.bramble.crypto.EllipticCurveConstants.PARAMETERS;
+import static org.briarproject.bramble.util.ByteUtils.INT_16_BYTES;
 import static org.briarproject.bramble.util.ByteUtils.INT_32_BYTES;
 import static org.briarproject.bramble.util.ByteUtils.INT_64_BYTES;
+import static org.briarproject.bramble.util.ByteUtils.MAX_16_BIT_UNSIGNED;
 import static org.briarproject.bramble.util.ByteUtils.MAX_32_BIT_UNSIGNED;
 
 class CryptoComponentImpl implements CryptoComponent {
@@ -412,8 +414,11 @@ class CryptoComponentImpl implements CryptoComponent {
 	}
 
 	@Override
-	public void encodeTag(byte[] tag, SecretKey tagKey, long streamNumber) {
+	public void encodeTag(byte[] tag, SecretKey tagKey, int protocolVersion,
+			long streamNumber) {
 		if (tag.length < TAG_LENGTH) throw new IllegalArgumentException();
+		if (protocolVersion < 0 || protocolVersion > MAX_16_BIT_UNSIGNED)
+			throw new IllegalArgumentException();
 		if (streamNumber < 0 || streamNumber > MAX_32_BIT_UNSIGNED)
 			throw new IllegalArgumentException();
 		// Initialise the PRF
@@ -421,10 +426,14 @@ class CryptoComponentImpl implements CryptoComponent {
 		// The output of the PRF must be long enough to use as a tag
 		int macLength = prf.getDigestSize();
 		if (macLength < TAG_LENGTH) throw new IllegalStateException();
-		// The input is the stream number as a 64-bit integer
+		// The input is the protocol version as a 16-bit integer, followed by
-		byte[] input = new byte[INT_64_BYTES];
+		// the stream number as a 64-bit integer
-		ByteUtils.writeUint64(streamNumber, input, 0);
+		byte[] protocolVersionBytes = new byte[INT_16_BYTES];
-		prf.update(input, 0, input.length);
+		ByteUtils.writeUint16(protocolVersion, protocolVersionBytes, 0);
+		prf.update(protocolVersionBytes, 0, protocolVersionBytes.length);
+		byte[] streamNumberBytes = new byte[INT_64_BYTES];
+		ByteUtils.writeUint64(streamNumber, streamNumberBytes, 0);
+		prf.update(streamNumberBytes, 0, streamNumberBytes.length);
 		byte[] mac = new byte[macLength];
 		prf.doFinal(mac, 0);
 		// The output is the first TAG_LENGTH bytes of the MAC

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

@@ -20,9 +20,11 @@ import static org.briarproject.bramble.api.transport.TransportConstants.FRAME_NO
 import static org.briarproject.bramble.api.transport.TransportConstants.MAC_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.MAX_FRAME_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.MAX_PAYLOAD_LENGTH;
-import static org.briarproject.bramble.api.transport.TransportConstants.STREAM_HEADER_IV_LENGTH;
+import static org.briarproject.bramble.api.transport.TransportConstants.PROTOCOL_VERSION;
 import static org.briarproject.bramble.api.transport.TransportConstants.STREAM_HEADER_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.STREAM_HEADER_NONCE_LENGTH;
+import static org.briarproject.bramble.api.transport.TransportConstants.STREAM_HEADER_PLAINTEXT_LENGTH;
+import static org.briarproject.bramble.util.ByteUtils.INT_16_BYTES;
 import static org.briarproject.bramble.util.ByteUtils.INT_64_BYTES;
 
 @NotThreadSafe
@@ -117,7 +119,7 @@ class StreamDecrypterImpl implements StreamDecrypter {
 
 	private void readStreamHeader() throws IOException {
 		byte[] streamHeaderCiphertext = new byte[STREAM_HEADER_LENGTH];
-		byte[] streamHeaderPlaintext = new byte[SecretKey.LENGTH];
+		byte[] streamHeaderPlaintext = new byte[STREAM_HEADER_PLAINTEXT_LENGTH];
 		// Read the stream header
 		int offset = 0;
 		while (offset < STREAM_HEADER_LENGTH) {
@@ -126,21 +128,35 @@ class StreamDecrypterImpl implements StreamDecrypter {
 			if (read == -1) throw new EOFException();
 			offset += read;
 		}
-		// The nonce consists of the stream number followed by the IV
+		// Extract the nonce
 		byte[] streamHeaderNonce = new byte[STREAM_HEADER_NONCE_LENGTH];
-		ByteUtils.writeUint64(streamNumber, streamHeaderNonce, 0);
+		System.arraycopy(streamHeaderCiphertext, 0, streamHeaderNonce, 0,
-		System.arraycopy(streamHeaderCiphertext, 0, streamHeaderNonce,
+				STREAM_HEADER_NONCE_LENGTH);
-				INT_64_BYTES, STREAM_HEADER_IV_LENGTH);
 		// Decrypt and authenticate the stream header
 		try {
 			cipher.init(false, streamHeaderKey, streamHeaderNonce);
 			int decrypted = cipher.process(streamHeaderCiphertext,
-					STREAM_HEADER_IV_LENGTH, SecretKey.LENGTH + MAC_LENGTH,
+					STREAM_HEADER_NONCE_LENGTH,
+					STREAM_HEADER_PLAINTEXT_LENGTH + MAC_LENGTH,
 					streamHeaderPlaintext, 0);
-			if (decrypted != SecretKey.LENGTH) throw new RuntimeException();
+			if (decrypted != STREAM_HEADER_PLAINTEXT_LENGTH)
+				throw new RuntimeException();
 		} catch (GeneralSecurityException e) {
 			throw new FormatException();
 		}
-		frameKey = new SecretKey(streamHeaderPlaintext);
+		// Check the protocol version
+		int receivedProtocolVersion =
+				ByteUtils.readUint16(streamHeaderPlaintext, 0);
+		if (receivedProtocolVersion != PROTOCOL_VERSION)
+			throw new FormatException();
+		// Check the stream number
+		long receivedStreamNumber = ByteUtils.readUint64(streamHeaderPlaintext,
+				INT_16_BYTES);
+		if (receivedStreamNumber != streamNumber) throw new FormatException();
+		// Extract the frame key
+		byte[] frameKeyBytes = new byte[SecretKey.LENGTH];
+		System.arraycopy(streamHeaderPlaintext, INT_16_BYTES + INT_64_BYTES,
+				frameKeyBytes, 0, SecretKey.LENGTH);
+		frameKey = new SecretKey(frameKeyBytes);
 	}
 }

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

@@ -13,7 +13,8 @@ import javax.annotation.concurrent.Immutable;
 import javax.inject.Inject;
 import javax.inject.Provider;
 
-import static org.briarproject.bramble.api.transport.TransportConstants.STREAM_HEADER_IV_LENGTH;
+import static org.briarproject.bramble.api.transport.TransportConstants.PROTOCOL_VERSION;
+import static org.briarproject.bramble.api.transport.TransportConstants.STREAM_HEADER_NONCE_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.TAG_LENGTH;
 
 @Immutable
@@ -36,22 +37,22 @@ class StreamEncrypterFactoryImpl implements StreamEncrypterFactory {
 		AuthenticatedCipher cipher = cipherProvider.get();
 		long streamNumber = ctx.getStreamNumber();
 		byte[] tag = new byte[TAG_LENGTH];
-		crypto.encodeTag(tag, ctx.getTagKey(), streamNumber);
+		crypto.encodeTag(tag, ctx.getTagKey(), PROTOCOL_VERSION, streamNumber);
-		byte[] streamHeaderIv = new byte[STREAM_HEADER_IV_LENGTH];
+		byte[] streamHeaderNonce = new byte[STREAM_HEADER_NONCE_LENGTH];
-		crypto.getSecureRandom().nextBytes(streamHeaderIv);
+		crypto.getSecureRandom().nextBytes(streamHeaderNonce);
 		SecretKey frameKey = crypto.generateSecretKey();
 		return new StreamEncrypterImpl(out, cipher, streamNumber, tag,
-				streamHeaderIv, ctx.getHeaderKey(), frameKey);
+				streamHeaderNonce, ctx.getHeaderKey(), frameKey);
 	}
 
 	@Override
 	public StreamEncrypter createInvitationStreamEncrypter(OutputStream out,
 			SecretKey headerKey) {
 		AuthenticatedCipher cipher = cipherProvider.get();
-		byte[] streamHeaderIv = new byte[STREAM_HEADER_IV_LENGTH];
+		byte[] streamHeaderNonce = new byte[STREAM_HEADER_NONCE_LENGTH];
-		crypto.getSecureRandom().nextBytes(streamHeaderIv);
+		crypto.getSecureRandom().nextBytes(streamHeaderNonce);
 		SecretKey frameKey = crypto.generateSecretKey();
-		return new StreamEncrypterImpl(out, cipher, 0, null, streamHeaderIv,
+		return new StreamEncrypterImpl(out, cipher, 0, null, streamHeaderNonce,
 				headerKey, frameKey);
 	}
 }

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

@@ -18,9 +18,11 @@ import static org.briarproject.bramble.api.transport.TransportConstants.FRAME_NO
 import static org.briarproject.bramble.api.transport.TransportConstants.MAC_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.MAX_FRAME_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.MAX_PAYLOAD_LENGTH;
-import static org.briarproject.bramble.api.transport.TransportConstants.STREAM_HEADER_IV_LENGTH;
+import static org.briarproject.bramble.api.transport.TransportConstants.PROTOCOL_VERSION;
 import static org.briarproject.bramble.api.transport.TransportConstants.STREAM_HEADER_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.STREAM_HEADER_NONCE_LENGTH;
+import static org.briarproject.bramble.api.transport.TransportConstants.STREAM_HEADER_PLAINTEXT_LENGTH;
+import static org.briarproject.bramble.util.ByteUtils.INT_16_BYTES;
 import static org.briarproject.bramble.util.ByteUtils.INT_64_BYTES;
 
 @NotThreadSafe
@@ -33,7 +35,7 @@ class StreamEncrypterImpl implements StreamEncrypter {
 	private final long streamNumber;
 	@Nullable
 	private final byte[] tag;
-	private final byte[] streamHeaderIv;
+	private final byte[] streamHeaderNonce;
 	private final byte[] frameNonce, frameHeader;
 	private final byte[] framePlaintext, frameCiphertext;
 
@@ -41,13 +43,13 @@ class StreamEncrypterImpl implements StreamEncrypter {
 	private boolean writeTag, writeStreamHeader;
 
 	StreamEncrypterImpl(OutputStream out, AuthenticatedCipher cipher,
-			long streamNumber, @Nullable byte[] tag, byte[] streamHeaderIv,
+			long streamNumber, @Nullable byte[] tag, byte[] streamHeaderNonce,
 			SecretKey streamHeaderKey, SecretKey frameKey) {
 		this.out = out;
 		this.cipher = cipher;
 		this.streamNumber = streamNumber;
 		this.tag = tag;
-		this.streamHeaderIv = streamHeaderIv;
+		this.streamHeaderNonce = streamHeaderNonce;
 		this.streamHeaderKey = streamHeaderKey;
 		this.frameKey = frameKey;
 		frameNonce = new byte[FRAME_NONCE_LENGTH];
@@ -114,22 +116,23 @@ class StreamEncrypterImpl implements StreamEncrypter {
 	}
 
 	private void writeStreamHeader() throws IOException {
-		// The nonce consists of the stream number followed by the IV
+		// The header contains the protocol version, stream number and frame key
-		byte[] streamHeaderNonce = new byte[STREAM_HEADER_NONCE_LENGTH];
+		byte[] streamHeaderPlaintext = new byte[STREAM_HEADER_PLAINTEXT_LENGTH];
-		ByteUtils.writeUint64(streamNumber, streamHeaderNonce, 0);
+		ByteUtils.writeUint16(PROTOCOL_VERSION, streamHeaderPlaintext, 0);
-		System.arraycopy(streamHeaderIv, 0, streamHeaderNonce, INT_64_BYTES,
+		ByteUtils.writeUint64(streamNumber, streamHeaderPlaintext,
-				STREAM_HEADER_IV_LENGTH);
+				INT_16_BYTES);
-		byte[] streamHeaderPlaintext = frameKey.getBytes();
+		System.arraycopy(frameKey.getBytes(), 0, streamHeaderPlaintext,
+				INT_16_BYTES + INT_64_BYTES, SecretKey.LENGTH);
 		byte[] streamHeaderCiphertext = new byte[STREAM_HEADER_LENGTH];
-		System.arraycopy(streamHeaderIv, 0, streamHeaderCiphertext, 0,
+		System.arraycopy(streamHeaderNonce, 0, streamHeaderCiphertext, 0,
-				STREAM_HEADER_IV_LENGTH);
+				STREAM_HEADER_NONCE_LENGTH);
-		// Encrypt and authenticate the frame key
+		// Encrypt and authenticate the stream header key
 		try {
 			cipher.init(true, streamHeaderKey, streamHeaderNonce);
 			int encrypted = cipher.process(streamHeaderPlaintext, 0,
-					SecretKey.LENGTH, streamHeaderCiphertext,
+					STREAM_HEADER_PLAINTEXT_LENGTH, streamHeaderCiphertext,
-					STREAM_HEADER_IV_LENGTH);
+					STREAM_HEADER_NONCE_LENGTH);
-			if (encrypted != SecretKey.LENGTH + MAC_LENGTH)
+			if (encrypted != STREAM_HEADER_PLAINTEXT_LENGTH + MAC_LENGTH)
 				throw new RuntimeException();
 		} catch (GeneralSecurityException badCipher) {
 			throw new RuntimeException(badCipher);

bramble-core/src/main/java/org/briarproject/bramble/crypto/XSalsa20Poly1305AuthenticatedCipher.java

@@ -70,25 +70,7 @@ class XSalsa20Poly1305AuthenticatedCipher implements AuthenticatedCipher {
 			byte[] subKey = new byte[SUBKEY_LENGTH];
 			xSalsa20Engine.processBytes(zero, 0, SUBKEY_LENGTH, subKey, 0);
 
-			// Reverse the order of the Poly130 subkey
+			// Clamp the subkey
-			//
-			// NaCl and libsodium use the first 32 bytes of XSalsa20 as the
-			// subkey for crypto_onetimeauth_poly1305, which interprets it
-			// as r[0] ... r[15], k[0] ... k[15]. See section 9 of the NaCl
-			// paper (http://cr.yp.to/highspeed/naclcrypto-20090310.pdf),
-			// where the XSalsa20 output is defined as (r, s, t, ...).
-			//
-			// BC's Poly1305 implementation interprets the subkey as
-			// k[0] ... k[15], r[0] ... r[15] (per poly1305_aes_clamp in
-			// the reference implementation).
-			//
-			// To be NaCl-compatible, we reverse the subkey.
-			System.arraycopy(subKey, 0, zero, 0, SUBKEY_LENGTH / 2);
-			System.arraycopy(subKey, SUBKEY_LENGTH / 2, subKey, 0,
-					SUBKEY_LENGTH / 2);
-			System.arraycopy(zero, 0, subKey, SUBKEY_LENGTH / 2,
-					SUBKEY_LENGTH / 2);
-			// Now we can clamp the correct part of the subkey
 			Poly1305KeyGenerator.clamp(subKey);
 
 			// Initialize Poly1305 with the subkey

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

@@ -29,6 +29,7 @@ import javax.annotation.concurrent.ThreadSafe;
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.api.transport.TransportConstants.MAX_CLOCK_DIFFERENCE;
+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;
 
@@ -126,7 +127,8 @@ class TransportKeyManagerImpl implements TransportKeyManager {
 		for (long streamNumber : inKeys.getWindow().getUnseen()) {
 			TagContext tagCtx = new TagContext(c, inKeys, streamNumber);
 			byte[] tag = new byte[TAG_LENGTH];
-			crypto.encodeTag(tag, inKeys.getTagKey(), streamNumber);
+			crypto.encodeTag(tag, inKeys.getTagKey(), PROTOCOL_VERSION,
+					streamNumber);
 			inContexts.put(new Bytes(tag), tagCtx);
 		}
 	}
@@ -242,7 +244,8 @@ class TransportKeyManagerImpl implements TransportKeyManager {
 			// Add tags for any stream numbers added to the window
 			for (long streamNumber : change.getAdded()) {
 				byte[] addTag = new byte[TAG_LENGTH];
-				crypto.encodeTag(addTag, inKeys.getTagKey(), streamNumber);
+				crypto.encodeTag(addTag, inKeys.getTagKey(), PROTOCOL_VERSION,
+						streamNumber);
 				inContexts.put(new Bytes(addTag), new TagContext(
 						tagCtx.contactId, inKeys, streamNumber));
 			}
@@ -250,7 +253,8 @@ class TransportKeyManagerImpl implements TransportKeyManager {
 			for (long streamNumber : change.getRemoved()) {
 				if (streamNumber == tagCtx.streamNumber) continue;
 				byte[] removeTag = new byte[TAG_LENGTH];
-				crypto.encodeTag(removeTag, inKeys.getTagKey(), streamNumber);
+				crypto.encodeTag(removeTag, inKeys.getTagKey(),
+						PROTOCOL_VERSION, streamNumber);
 				inContexts.remove(new Bytes(removeTag));
 			}
 			// Write the window back to the DB

bramble-core/src/test/java/org/briarproject/bramble/crypto/StreamDecrypterImplTest.java

@@ -14,7 +14,8 @@ import static junit.framework.Assert.assertEquals;
 import static org.briarproject.bramble.api.transport.TransportConstants.FRAME_HEADER_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.MAC_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.MAX_PAYLOAD_LENGTH;
-import static org.briarproject.bramble.api.transport.TransportConstants.STREAM_HEADER_IV_LENGTH;
+import static org.briarproject.bramble.api.transport.TransportConstants.PROTOCOL_VERSION;
+import static org.briarproject.bramble.api.transport.TransportConstants.STREAM_HEADER_NONCE_LENGTH;
 import static org.briarproject.bramble.util.ByteUtils.INT_16_BYTES;
 import static org.junit.Assert.assertArrayEquals;
 
@@ -22,7 +23,8 @@ public class StreamDecrypterImplTest extends BrambleTestCase {
 
 	private final AuthenticatedCipher cipher;
 	private final SecretKey streamHeaderKey, frameKey;
-	private final byte[] streamHeaderIv, payload;
+	private final byte[] streamHeaderNonce, protocolVersionBytes;
+	private final byte[] streamNumberBytes, payload;
 	private final int payloadLength = 123, paddingLength = 234;
 	private final long streamNumber = 1234;
 
@@ -30,7 +32,12 @@ public class StreamDecrypterImplTest extends BrambleTestCase {
 		cipher = new TestAuthenticatedCipher(); // Null cipher
 		streamHeaderKey = TestUtils.getSecretKey();
 		frameKey = TestUtils.getSecretKey();
-		streamHeaderIv = TestUtils.getRandomBytes(STREAM_HEADER_IV_LENGTH);
+		streamHeaderNonce =
+				TestUtils.getRandomBytes(STREAM_HEADER_NONCE_LENGTH);
+		protocolVersionBytes = new byte[2];
+		ByteUtils.writeUint16(PROTOCOL_VERSION, protocolVersionBytes, 0);
+		streamNumberBytes = new byte[8];
+		ByteUtils.writeUint64(streamNumber, streamNumberBytes, 0);
 		payload = TestUtils.getRandomBytes(payloadLength);
 	}
 
@@ -47,7 +54,9 @@ public class StreamDecrypterImplTest extends BrambleTestCase {
 		byte[] payload1 = TestUtils.getRandomBytes(payloadLength1);
 
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
-		out.write(streamHeaderIv);
+		out.write(streamHeaderNonce);
+		out.write(protocolVersionBytes);
+		out.write(streamNumberBytes);
 		out.write(frameKey.getBytes());
 		out.write(new byte[MAC_LENGTH]);
 		out.write(frameHeader);
@@ -76,6 +85,85 @@ public class StreamDecrypterImplTest extends BrambleTestCase {
 		assertEquals(-1, s.readFrame(buffer));
 	}
 
+	@Test(expected = IOException.class)
+	public void testWrongProtocolVersionThrowsException() throws Exception {
+		byte[] wrongProtocolVersionBytes = new byte[2];
+		ByteUtils.writeUint16(PROTOCOL_VERSION + 1, wrongProtocolVersionBytes,
+				0);
+
+		byte[] frameHeader = new byte[FRAME_HEADER_LENGTH];
+		FrameEncoder.encodeHeader(frameHeader, false, payloadLength,
+				paddingLength);
+
+		byte[] frameHeader1 = new byte[FRAME_HEADER_LENGTH];
+		int payloadLength1 = 345, paddingLength1 = 456;
+		FrameEncoder.encodeHeader(frameHeader1, true, payloadLength1,
+				paddingLength1);
+		byte[] payload1 = TestUtils.getRandomBytes(payloadLength1);
+
+		ByteArrayOutputStream out = new ByteArrayOutputStream();
+		out.write(streamHeaderNonce);
+		out.write(wrongProtocolVersionBytes);
+		out.write(streamNumberBytes);
+		out.write(frameKey.getBytes());
+		out.write(new byte[MAC_LENGTH]);
+		out.write(frameHeader);
+		out.write(payload);
+		out.write(new byte[paddingLength]);
+		out.write(new byte[MAC_LENGTH]);
+		out.write(frameHeader1);
+		out.write(payload1);
+		out.write(new byte[paddingLength1]);
+		out.write(new byte[MAC_LENGTH]);
+
+		ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
+		StreamDecrypterImpl s = new StreamDecrypterImpl(in, cipher,
+				streamNumber, streamHeaderKey);
+
+		// Try to read the first frame
+		byte[] buffer = new byte[MAX_PAYLOAD_LENGTH];
+		s.readFrame(buffer);
+	}
+
+	@Test(expected = IOException.class)
+	public void testWrongStreamNumberThrowsException() throws Exception {
+		byte[] wrongStreamNumberBytes = new byte[8];
+		ByteUtils.writeUint64(streamNumber + 1, wrongStreamNumberBytes, 0);
+
+		byte[] frameHeader = new byte[FRAME_HEADER_LENGTH];
+		FrameEncoder.encodeHeader(frameHeader, false, payloadLength,
+				paddingLength);
+
+		byte[] frameHeader1 = new byte[FRAME_HEADER_LENGTH];
+		int payloadLength1 = 345, paddingLength1 = 456;
+		FrameEncoder.encodeHeader(frameHeader1, true, payloadLength1,
+				paddingLength1);
+		byte[] payload1 = TestUtils.getRandomBytes(payloadLength1);
+
+		ByteArrayOutputStream out = new ByteArrayOutputStream();
+		out.write(streamHeaderNonce);
+		out.write(protocolVersionBytes);
+		out.write(wrongStreamNumberBytes);
+		out.write(frameKey.getBytes());
+		out.write(new byte[MAC_LENGTH]);
+		out.write(frameHeader);
+		out.write(payload);
+		out.write(new byte[paddingLength]);
+		out.write(new byte[MAC_LENGTH]);
+		out.write(frameHeader1);
+		out.write(payload1);
+		out.write(new byte[paddingLength1]);
+		out.write(new byte[MAC_LENGTH]);
+
+		ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
+		StreamDecrypterImpl s = new StreamDecrypterImpl(in, cipher,
+				streamNumber, streamHeaderKey);
+
+		// Try to read the first frame
+		byte[] buffer = new byte[MAX_PAYLOAD_LENGTH];
+		s.readFrame(buffer);
+	}
+
 	@Test(expected = IOException.class)
 	public void testTruncatedFrameThrowsException() throws Exception {
 		byte[] frameHeader = new byte[FRAME_HEADER_LENGTH];
@@ -83,7 +171,9 @@ public class StreamDecrypterImplTest extends BrambleTestCase {
 				paddingLength);
 
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
-		out.write(streamHeaderIv);
+		out.write(streamHeaderNonce);
+		out.write(protocolVersionBytes);
+		out.write(streamNumberBytes);
 		out.write(frameKey.getBytes());
 		out.write(new byte[MAC_LENGTH]);
 		out.write(frameHeader);
@@ -111,7 +201,9 @@ public class StreamDecrypterImplTest extends BrambleTestCase {
 		byte[] payload = TestUtils.getRandomBytes(payloadLength);
 
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
-		out.write(streamHeaderIv);
+		out.write(streamHeaderNonce);
+		out.write(protocolVersionBytes);
+		out.write(streamNumberBytes);
 		out.write(frameKey.getBytes());
 		out.write(new byte[MAC_LENGTH]);
 		out.write(frameHeader);
@@ -138,7 +230,9 @@ public class StreamDecrypterImplTest extends BrambleTestCase {
 		padding[paddingLength - 1] = 1;
 
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
-		out.write(streamHeaderIv);
+		out.write(streamHeaderNonce);
+		out.write(protocolVersionBytes);
+		out.write(streamNumberBytes);
 		out.write(frameKey.getBytes());
 		out.write(new byte[MAC_LENGTH]);
 		out.write(frameHeader);
@@ -162,7 +256,9 @@ public class StreamDecrypterImplTest extends BrambleTestCase {
 				paddingLength);
 
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
-		out.write(streamHeaderIv);
+		out.write(streamHeaderNonce);
+		out.write(protocolVersionBytes);
+		out.write(streamNumberBytes);
 		out.write(frameKey.getBytes());
 		out.write(new byte[MAC_LENGTH]);
 		out.write(frameHeader);

bramble-core/src/test/java/org/briarproject/bramble/crypto/StreamEncrypterImplTest.java

@@ -3,6 +3,7 @@ package org.briarproject.bramble.crypto;
 import org.briarproject.bramble.api.crypto.SecretKey;
 import org.briarproject.bramble.test.BrambleTestCase;
 import org.briarproject.bramble.test.TestUtils;
+import org.briarproject.bramble.util.ByteUtils;
 import org.junit.Test;
 
 import java.io.ByteArrayOutputStream;
@@ -11,8 +12,9 @@ import static org.briarproject.bramble.api.transport.TransportConstants.FRAME_HE
 import static org.briarproject.bramble.api.transport.TransportConstants.MAC_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.MAX_FRAME_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.MAX_PAYLOAD_LENGTH;
-import static org.briarproject.bramble.api.transport.TransportConstants.STREAM_HEADER_IV_LENGTH;
+import static org.briarproject.bramble.api.transport.TransportConstants.PROTOCOL_VERSION;
 import static org.briarproject.bramble.api.transport.TransportConstants.STREAM_HEADER_LENGTH;
+import static org.briarproject.bramble.api.transport.TransportConstants.STREAM_HEADER_NONCE_LENGTH;
 import static org.briarproject.bramble.api.transport.TransportConstants.TAG_LENGTH;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
@@ -21,7 +23,8 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 
 	private final AuthenticatedCipher cipher;
 	private final SecretKey streamHeaderKey, frameKey;
-	private final byte[] tag, streamHeaderIv, payload;
+	private final byte[] tag, streamHeaderNonce, protocolVersionBytes;
+	private final byte[] streamNumberBytes, payload;
 	private final long streamNumber = 1234;
 	private final int payloadLength = 123, paddingLength = 234;
 
@@ -30,7 +33,12 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 		streamHeaderKey = TestUtils.getSecretKey();
 		frameKey = TestUtils.getSecretKey();
 		tag = TestUtils.getRandomBytes(TAG_LENGTH);
-		streamHeaderIv = TestUtils.getRandomBytes(STREAM_HEADER_IV_LENGTH);
+		streamHeaderNonce =
+				TestUtils.getRandomBytes(STREAM_HEADER_NONCE_LENGTH);
+		protocolVersionBytes = new byte[2];
+		ByteUtils.writeUint16(PROTOCOL_VERSION, protocolVersionBytes, 0);
+		streamNumberBytes = new byte[8];
+		ByteUtils.writeUint64(streamNumber, streamNumberBytes, 0);
 		payload = TestUtils.getRandomBytes(payloadLength);
 	}
 
@@ -38,7 +46,8 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 	public void testRejectsNegativePayloadLength() throws Exception {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
 		StreamEncrypterImpl s = new StreamEncrypterImpl(out, cipher,
-				streamNumber, tag, streamHeaderIv, streamHeaderKey, frameKey);
+				streamNumber, tag, streamHeaderNonce, streamHeaderKey,
+				frameKey);
 
 		s.writeFrame(payload, -1, 0, false);
 	}
@@ -47,7 +56,8 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 	public void testRejectsNegativePaddingLength() throws Exception {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
 		StreamEncrypterImpl s = new StreamEncrypterImpl(out, cipher,
-				streamNumber, tag, streamHeaderIv, streamHeaderKey, frameKey);
+				streamNumber, tag, streamHeaderNonce, streamHeaderKey,
+				frameKey);
 
 		s.writeFrame(payload, 0, -1, false);
 	}
@@ -56,7 +66,8 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 	public void testRejectsMaxPayloadPlusPadding() throws Exception {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
 		StreamEncrypterImpl s = new StreamEncrypterImpl(out, cipher,
-				streamNumber, tag, streamHeaderIv, streamHeaderKey, frameKey);
+				streamNumber, tag, streamHeaderNonce, streamHeaderKey,
+				frameKey);
 
 		byte[] bigPayload = new byte[MAX_PAYLOAD_LENGTH + 1];
 		s.writeFrame(bigPayload, MAX_PAYLOAD_LENGTH, 1, false);
@@ -66,7 +77,8 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 	public void testAcceptsMaxPayloadIncludingPadding() throws Exception {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
 		StreamEncrypterImpl s = new StreamEncrypterImpl(out, cipher,
-				streamNumber, tag, streamHeaderIv, streamHeaderKey, frameKey);
+				streamNumber, tag, streamHeaderNonce, streamHeaderKey,
+				frameKey);
 
 		byte[] bigPayload = new byte[MAX_PAYLOAD_LENGTH];
 		s.writeFrame(bigPayload, MAX_PAYLOAD_LENGTH - 1, 1, false);
@@ -78,7 +90,8 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 	public void testAcceptsMaxPayloadWithoutPadding() throws Exception {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
 		StreamEncrypterImpl s = new StreamEncrypterImpl(out, cipher,
-				streamNumber, tag, streamHeaderIv, streamHeaderKey, frameKey);
+				streamNumber, tag, streamHeaderNonce, streamHeaderKey,
+				frameKey);
 
 		byte[] bigPayload = new byte[MAX_PAYLOAD_LENGTH];
 		s.writeFrame(bigPayload, MAX_PAYLOAD_LENGTH, 0, false);
@@ -90,14 +103,17 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 	public void testWriteUnpaddedNonFinalFrameWithTag() throws Exception {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
 		StreamEncrypterImpl s = new StreamEncrypterImpl(out, cipher,
-				streamNumber, tag, streamHeaderIv, streamHeaderKey, frameKey);
+				streamNumber, tag, streamHeaderNonce, streamHeaderKey,
+				frameKey);
 
 		s.writeFrame(payload, payloadLength, 0, false);
 
 		// Expect the tag, stream header, frame header, payload and MAC
 		ByteArrayOutputStream expected = new ByteArrayOutputStream();
 		expected.write(tag);
-		expected.write(streamHeaderIv);
+		expected.write(streamHeaderNonce);
+		expected.write(protocolVersionBytes);
+		expected.write(streamNumberBytes);
 		expected.write(frameKey.getBytes());
 		expected.write(new byte[MAC_LENGTH]);
 		byte[] expectedFrameHeader = new byte[FRAME_HEADER_LENGTH];
@@ -113,14 +129,17 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 	public void testWriteUnpaddedFinalFrameWithTag() throws Exception {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
 		StreamEncrypterImpl s = new StreamEncrypterImpl(out, cipher,
-				streamNumber, tag, streamHeaderIv, streamHeaderKey, frameKey);
+				streamNumber, tag, streamHeaderNonce, streamHeaderKey,
+				frameKey);
 
 		s.writeFrame(payload, payloadLength, 0, true);
 
 		// Expect the tag, stream header, frame header, payload and MAC
 		ByteArrayOutputStream expected = new ByteArrayOutputStream();
 		expected.write(tag);
-		expected.write(streamHeaderIv);
+		expected.write(streamHeaderNonce);
+		expected.write(protocolVersionBytes);
+		expected.write(streamNumberBytes);
 		expected.write(frameKey.getBytes());
 		expected.write(new byte[MAC_LENGTH]);
 		byte[] expectedFrameHeader = new byte[FRAME_HEADER_LENGTH];
@@ -136,13 +155,16 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 	public void testWriteUnpaddedNonFinalFrameWithoutTag() throws Exception {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
 		StreamEncrypterImpl s = new StreamEncrypterImpl(out, cipher,
-				streamNumber, null, streamHeaderIv, streamHeaderKey, frameKey);
+				streamNumber, null, streamHeaderNonce, streamHeaderKey,
+				frameKey);
 
 		s.writeFrame(payload, payloadLength, 0, false);
 
 		// Expect the stream header, frame header, payload and MAC
 		ByteArrayOutputStream expected = new ByteArrayOutputStream();
-		expected.write(streamHeaderIv);
+		expected.write(streamHeaderNonce);
+		expected.write(protocolVersionBytes);
+		expected.write(streamNumberBytes);
 		expected.write(frameKey.getBytes());
 		expected.write(new byte[MAC_LENGTH]);
 		byte[] expectedFrameHeader = new byte[FRAME_HEADER_LENGTH];
@@ -158,13 +180,16 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 	public void testWriteUnpaddedFinalFrameWithoutTag() throws Exception {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
 		StreamEncrypterImpl s = new StreamEncrypterImpl(out, cipher,
-				streamNumber, null, streamHeaderIv, streamHeaderKey, frameKey);
+				streamNumber, null, streamHeaderNonce, streamHeaderKey,
+				frameKey);
 
 		s.writeFrame(payload, payloadLength, 0, true);
 
 		// Expect the stream header, frame header, payload and MAC
 		ByteArrayOutputStream expected = new ByteArrayOutputStream();
-		expected.write(streamHeaderIv);
+		expected.write(streamHeaderNonce);
+		expected.write(protocolVersionBytes);
+		expected.write(streamNumberBytes);
 		expected.write(frameKey.getBytes());
 		expected.write(new byte[MAC_LENGTH]);
 		byte[] expectedFrameHeader = new byte[FRAME_HEADER_LENGTH];
@@ -180,14 +205,17 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 	public void testWritePaddedNonFinalFrameWithTag() throws Exception {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
 		StreamEncrypterImpl s = new StreamEncrypterImpl(out, cipher,
-				streamNumber, tag, streamHeaderIv, streamHeaderKey, frameKey);
+				streamNumber, tag, streamHeaderNonce, streamHeaderKey,
+				frameKey);
 
 		s.writeFrame(payload, payloadLength, paddingLength, false);
 
 		// Expect the tag, stream header, frame header, payload, padding and MAC
 		ByteArrayOutputStream expected = new ByteArrayOutputStream();
 		expected.write(tag);
-		expected.write(streamHeaderIv);
+		expected.write(streamHeaderNonce);
+		expected.write(protocolVersionBytes);
+		expected.write(streamNumberBytes);
 		expected.write(frameKey.getBytes());
 		expected.write(new byte[MAC_LENGTH]);
 		byte[] expectedFrameHeader = new byte[FRAME_HEADER_LENGTH];
@@ -205,14 +233,17 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 	public void testWritePaddedFinalFrameWithTag() throws Exception {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
 		StreamEncrypterImpl s = new StreamEncrypterImpl(out, cipher,
-				streamNumber, tag, streamHeaderIv, streamHeaderKey, frameKey);
+				streamNumber, tag, streamHeaderNonce, streamHeaderKey,
+				frameKey);
 
 		s.writeFrame(payload, payloadLength, paddingLength, true);
 
 		// Expect the tag, stream header, frame header, payload, padding and MAC
 		ByteArrayOutputStream expected = new ByteArrayOutputStream();
 		expected.write(tag);
-		expected.write(streamHeaderIv);
+		expected.write(streamHeaderNonce);
+		expected.write(protocolVersionBytes);
+		expected.write(streamNumberBytes);
 		expected.write(frameKey.getBytes());
 		expected.write(new byte[MAC_LENGTH]);
 		byte[] expectedFrameHeader = new byte[FRAME_HEADER_LENGTH];
@@ -230,13 +261,16 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 	public void testWritePaddedNonFinalFrameWithoutTag() throws Exception {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
 		StreamEncrypterImpl s = new StreamEncrypterImpl(out, cipher,
-				streamNumber, null, streamHeaderIv, streamHeaderKey, frameKey);
+				streamNumber, null, streamHeaderNonce, streamHeaderKey,
+				frameKey);
 
 		s.writeFrame(payload, payloadLength, paddingLength, false);
 
 		// Expect the stream header, frame header, payload, padding and MAC
 		ByteArrayOutputStream expected = new ByteArrayOutputStream();
-		expected.write(streamHeaderIv);
+		expected.write(streamHeaderNonce);
+		expected.write(protocolVersionBytes);
+		expected.write(streamNumberBytes);
 		expected.write(frameKey.getBytes());
 		expected.write(new byte[MAC_LENGTH]);
 		byte[] expectedFrameHeader = new byte[FRAME_HEADER_LENGTH];
@@ -254,13 +288,16 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 	public void testWritePaddedFinalFrameWithoutTag() throws Exception {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
 		StreamEncrypterImpl s = new StreamEncrypterImpl(out, cipher,
-				streamNumber, null, streamHeaderIv, streamHeaderKey, frameKey);
+				streamNumber, null, streamHeaderNonce, streamHeaderKey,
+				frameKey);
 
 		s.writeFrame(payload, payloadLength, paddingLength, true);
 
 		// Expect the stream header, frame header, payload, padding and MAC
 		ByteArrayOutputStream expected = new ByteArrayOutputStream();
-		expected.write(streamHeaderIv);
+		expected.write(streamHeaderNonce);
+		expected.write(protocolVersionBytes);
+		expected.write(streamNumberBytes);
 		expected.write(frameKey.getBytes());
 		expected.write(new byte[MAC_LENGTH]);
 		byte[] expectedFrameHeader = new byte[FRAME_HEADER_LENGTH];
@@ -278,7 +315,8 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 	public void testWriteTwoFramesWithTag() throws Exception {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
 		StreamEncrypterImpl s = new StreamEncrypterImpl(out, cipher,
-				streamNumber, tag, streamHeaderIv, streamHeaderKey, frameKey);
+				streamNumber, tag, streamHeaderNonce, streamHeaderKey,
+				frameKey);
 		int payloadLength1 = 345, paddingLength1 = 456;
 		byte[] payload1 = TestUtils.getRandomBytes(payloadLength1);
 
@@ -289,7 +327,9 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 		// MAC, second frame header, payload, padding, MAC
 		ByteArrayOutputStream expected = new ByteArrayOutputStream();
 		expected.write(tag);
-		expected.write(streamHeaderIv);
+		expected.write(streamHeaderNonce);
+		expected.write(protocolVersionBytes);
+		expected.write(streamNumberBytes);
 		expected.write(frameKey.getBytes());
 		expected.write(new byte[MAC_LENGTH]);
 		byte[] expectedFrameHeader = new byte[FRAME_HEADER_LENGTH];
@@ -315,7 +355,8 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 			throws Exception {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
 		StreamEncrypterImpl s = new StreamEncrypterImpl(out, cipher,
-				streamNumber, tag, streamHeaderIv, streamHeaderKey, frameKey);
+				streamNumber, tag, streamHeaderNonce, streamHeaderKey,
+				frameKey);
 
 		// Flush the stream once
 		s.flush();
@@ -323,7 +364,9 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 		// Expect the tag and stream header
 		ByteArrayOutputStream expected = new ByteArrayOutputStream();
 		expected.write(tag);
-		expected.write(streamHeaderIv);
+		expected.write(streamHeaderNonce);
+		expected.write(protocolVersionBytes);
+		expected.write(streamNumberBytes);
 		expected.write(frameKey.getBytes());
 		expected.write(new byte[MAC_LENGTH]);
 
@@ -335,7 +378,8 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 			throws Exception {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
 		StreamEncrypterImpl s = new StreamEncrypterImpl(out, cipher,
-				streamNumber, tag, streamHeaderIv, streamHeaderKey, frameKey);
+				streamNumber, tag, streamHeaderNonce, streamHeaderKey,
+				frameKey);
 
 		// Flush the stream twice
 		s.flush();
@@ -344,7 +388,9 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 		// Expect the tag and stream header
 		ByteArrayOutputStream expected = new ByteArrayOutputStream();
 		expected.write(tag);
-		expected.write(streamHeaderIv);
+		expected.write(streamHeaderNonce);
+		expected.write(protocolVersionBytes);
+		expected.write(streamNumberBytes);
 		expected.write(frameKey.getBytes());
 		expected.write(new byte[MAC_LENGTH]);
 
@@ -355,14 +401,17 @@ public class StreamEncrypterImplTest extends BrambleTestCase {
 	public void testFlushDoesNotWriteTagIfNull() throws Exception {
 		ByteArrayOutputStream out = new ByteArrayOutputStream();
 		StreamEncrypterImpl s = new StreamEncrypterImpl(out, cipher,
-				streamNumber, null, streamHeaderIv, streamHeaderKey, frameKey);
+				streamNumber, null, streamHeaderNonce, streamHeaderKey,
+				frameKey);
 
 		// Flush the stream once
 		s.flush();
 
 		// Expect the stream header
 		ByteArrayOutputStream expected = new ByteArrayOutputStream();
-		expected.write(streamHeaderIv);
+		expected.write(streamHeaderNonce);
+		expected.write(protocolVersionBytes);
+		expected.write(streamNumberBytes);
 		expected.write(frameKey.getBytes());
 		expected.write(new byte[MAC_LENGTH]);
 

bramble-core/src/test/java/org/briarproject/bramble/crypto/TagEncodingTest.java

@@ -0,0 +1,59 @@
+package org.briarproject.bramble.crypto;
+
+import org.briarproject.bramble.api.Bytes;
+import org.briarproject.bramble.api.crypto.CryptoComponent;
+import org.briarproject.bramble.api.crypto.SecretKey;
+import org.briarproject.bramble.test.BrambleTestCase;
+import org.briarproject.bramble.test.TestSecureRandomProvider;
+import org.briarproject.bramble.test.TestUtils;
+import org.junit.Test;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import static junit.framework.TestCase.assertTrue;
+import static org.briarproject.bramble.api.transport.TransportConstants.PROTOCOL_VERSION;
+import static org.briarproject.bramble.api.transport.TransportConstants.TAG_LENGTH;
+
+public class TagEncodingTest extends BrambleTestCase {
+
+	private final CryptoComponent crypto;
+	private final SecretKey tagKey;
+	private final long streamNumber = 1234567890;
+
+	public TagEncodingTest() {
+		crypto = new CryptoComponentImpl(new TestSecureRandomProvider());
+		tagKey = TestUtils.getSecretKey();
+	}
+
+	@Test
+	public void testKeyAffectsTag() throws Exception {
+		Set<Bytes> set = new HashSet<Bytes>();
+		for (int i = 0; i < 100; i++) {
+			byte[] tag = new byte[TAG_LENGTH];
+			SecretKey tagKey = TestUtils.getSecretKey();
+			crypto.encodeTag(tag, tagKey, PROTOCOL_VERSION, streamNumber);
+			assertTrue(set.add(new Bytes(tag)));
+		}
+	}
+
+	@Test
+	public void testProtocolVersionAffectsTag() throws Exception {
+		Set<Bytes> set = new HashSet<Bytes>();
+		for (int i = 0; i < 100; i++) {
+			byte[] tag = new byte[TAG_LENGTH];
+			crypto.encodeTag(tag, tagKey, PROTOCOL_VERSION + i, streamNumber);
+			assertTrue(set.add(new Bytes(tag)));
+		}
+	}
+
+	@Test
+	public void testStreamNumberAffectsTag() throws Exception {
+		Set<Bytes> set = new HashSet<Bytes>();
+		for (int i = 0; i < 100; i++) {
+			byte[] tag = new byte[TAG_LENGTH];
+			crypto.encodeTag(tag, tagKey, PROTOCOL_VERSION, streamNumber + i);
+			assertTrue(set.add(new Bytes(tag)));
+		}
+	}
+}

bramble-core/src/test/java/org/briarproject/bramble/sync/SyncIntegrationTest.java

@@ -34,6 +34,7 @@ import java.util.Collection;
 import javax.inject.Inject;
 
 import static org.briarproject.bramble.api.sync.SyncConstants.MAX_GROUP_DESCRIPTOR_LENGTH;
+import static org.briarproject.bramble.api.transport.TransportConstants.PROTOCOL_VERSION;
 import static org.briarproject.bramble.api.transport.TransportConstants.TAG_LENGTH;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
@@ -115,7 +116,7 @@ public class SyncIntegrationTest extends BrambleTestCase {
 	private void read(byte[] connectionData) throws Exception {
 		// Calculate the expected tag
 		byte[] expectedTag = new byte[TAG_LENGTH];
-		crypto.encodeTag(expectedTag, tagKey, streamNumber);
+		crypto.encodeTag(expectedTag, tagKey, PROTOCOL_VERSION, streamNumber);
 
 		// Read the tag
 		InputStream in = new ByteArrayInputStream(connectionData);

bramble-core/src/test/java/org/briarproject/bramble/transport/TransportKeyManagerImplTest.java

@@ -33,6 +33,7 @@ import java.util.concurrent.ScheduledExecutorService;
 
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 import static org.briarproject.bramble.api.transport.TransportConstants.MAX_CLOCK_DIFFERENCE;
+import static org.briarproject.bramble.api.transport.TransportConstants.PROTOCOL_VERSION;
 import static org.briarproject.bramble.api.transport.TransportConstants.REORDERING_WINDOW_SIZE;
 import static org.briarproject.bramble.api.transport.TransportConstants.TAG_LENGTH;
 import static org.briarproject.bramble.util.ByteUtils.MAX_32_BIT_UNSIGNED;
@@ -86,7 +87,7 @@ public class TransportKeyManagerImplTest extends BrambleTestCase {
 			// Encode the tags (3 sets per contact)
 			for (long i = 0; i < REORDERING_WINDOW_SIZE; i++) {
 				exactly(6).of(crypto).encodeTag(with(any(byte[].class)),
-						with(tagKey), with(i));
+						with(tagKey), with(PROTOCOL_VERSION), with(i));
 				will(new EncodeTagAction());
 			}
 			// Save the keys that were rotated
@@ -133,7 +134,7 @@ public class TransportKeyManagerImplTest extends BrambleTestCase {
 			// Encode the tags (3 sets)
 			for (long i = 0; i < REORDERING_WINDOW_SIZE; i++) {
 				exactly(3).of(crypto).encodeTag(with(any(byte[].class)),
-						with(tagKey), with(i));
+						with(tagKey), with(PROTOCOL_VERSION), with(i));
 				will(new EncodeTagAction());
 			}
 			// Save the keys
@@ -199,7 +200,7 @@ public class TransportKeyManagerImplTest extends BrambleTestCase {
 			// Encode the tags (3 sets)
 			for (long i = 0; i < REORDERING_WINDOW_SIZE; i++) {
 				exactly(3).of(crypto).encodeTag(with(any(byte[].class)),
-						with(tagKey), with(i));
+						with(tagKey), with(PROTOCOL_VERSION), with(i));
 				will(new EncodeTagAction());
 			}
 			// Rotate the transport keys (the keys are unaffected)
@@ -247,7 +248,7 @@ public class TransportKeyManagerImplTest extends BrambleTestCase {
 			// Encode the tags (3 sets)
 			for (long i = 0; i < REORDERING_WINDOW_SIZE; i++) {
 				exactly(3).of(crypto).encodeTag(with(any(byte[].class)),
-						with(tagKey), with(i));
+						with(tagKey), with(PROTOCOL_VERSION), with(i));
 				will(new EncodeTagAction());
 			}
 			// Rotate the transport keys (the keys are unaffected)
@@ -306,7 +307,7 @@ public class TransportKeyManagerImplTest extends BrambleTestCase {
 			// Encode the tags (3 sets)
 			for (long i = 0; i < REORDERING_WINDOW_SIZE; i++) {
 				exactly(3).of(crypto).encodeTag(with(any(byte[].class)),
-						with(tagKey), with(i));
+						with(tagKey), with(PROTOCOL_VERSION), with(i));
 				will(new EncodeTagAction());
 			}
 			// Rotate the transport keys (the keys are unaffected)
@@ -355,7 +356,7 @@ public class TransportKeyManagerImplTest extends BrambleTestCase {
 			// Encode the tags (3 sets)
 			for (long i = 0; i < REORDERING_WINDOW_SIZE; i++) {
 				exactly(3).of(crypto).encodeTag(with(any(byte[].class)),
-						with(tagKey), with(i));
+						with(tagKey), with(PROTOCOL_VERSION), with(i));
 				will(new EncodeTagAction(tags));
 			}
 			// Rotate the transport keys (the keys are unaffected)
@@ -365,7 +366,8 @@ public class TransportKeyManagerImplTest extends BrambleTestCase {
 			oneOf(db).addTransportKeys(txn, contactId, transportKeys);
 			// Encode a new tag after sliding the window
 			oneOf(crypto).encodeTag(with(any(byte[].class)),
-					with(tagKey), with((long) REORDERING_WINDOW_SIZE));
+					with(tagKey), with(PROTOCOL_VERSION),
+					with((long) REORDERING_WINDOW_SIZE));
 			will(new EncodeTagAction(tags));
 			// Save the reordering window (previous rotation period, base 1)
 			oneOf(db).setReorderingWindow(txn, contactId, transportId, 999,
@@ -428,7 +430,7 @@ public class TransportKeyManagerImplTest extends BrambleTestCase {
 			// Encode the tags (3 sets)
 			for (long i = 0; i < REORDERING_WINDOW_SIZE; i++) {
 				exactly(3).of(crypto).encodeTag(with(any(byte[].class)),
-						with(tagKey), with(i));
+						with(tagKey), with(PROTOCOL_VERSION), with(i));
 				will(new EncodeTagAction());
 			}
 			// Schedule key rotation at the start of the next rotation period
@@ -450,7 +452,7 @@ public class TransportKeyManagerImplTest extends BrambleTestCase {
 			// Encode the tags (3 sets)
 			for (long i = 0; i < REORDERING_WINDOW_SIZE; i++) {
 				exactly(3).of(crypto).encodeTag(with(any(byte[].class)),
-						with(tagKey), with(i));
+						with(tagKey), with(PROTOCOL_VERSION), with(i));
 				will(new EncodeTagAction());
 			}
 			// Save the keys that were rotated

bramble-j2se/build.gradle

@@ -7,10 +7,19 @@ apply plugin: 'witness'
 dependencies {
 	compile project(':bramble-core')
 	compile fileTree(dir: 'libs', include: '*.jar')
+	compile 'net.java.dev.jna:jna:4.4.0'
+	compile 'net.java.dev.jna:jna-platform:4.4.0'
 
 	testCompile project(path: ':bramble-core', configuration: 'testOutput')
 }
 
+dependencyVerification {
+	verify = [
+			'net.java.dev.jna:jna:c4dadeeecaa90c8847902082aee5eb107fcf59c5d0e63a17fcaf273c0e2d2bd1',
+			'net.java.dev.jna:jna-platform:e9dda9e884fc107eb6367710540789a12dfa8ad28be9326b22ca6e352e325499',
+	]
+}
+
 tasks.withType(Test) {
 	systemProperty 'java.library.path', 'libs'
 }

briar-android/build.gradle

@@ -5,13 +5,10 @@ dependencies {
 	def supportVersion = '23.2.1'
 	compile project(':briar-core')
 	compile project(':bramble-android')
-	compile fileTree(dir: 'libs', include: '*.jar')
-
 	compile "com.android.support:support-v4:$supportVersion"
 	compile("com.android.support:appcompat-v7:$supportVersion") {
 		exclude module: 'support-v4'
 	}
-
 	compile("com.android.support:preference-v14:$supportVersion") {
 		exclude module: 'support-v4'
 	}
@@ -20,7 +17,7 @@ dependencies {
 		exclude module: 'recyclerview-v7'
 	}
 	compile "com.android.support:cardview-v7:$supportVersion"
-	compile 'com.android.support:support-annotations:23.4.0'
+	compile "com.android.support:support-annotations:$supportVersion"
 	compile('ch.acra:acra:4.8.5') {
 		exclude module: 'support-v4'
 		exclude module: 'support-annotations'
@@ -28,15 +25,16 @@ dependencies {
 	compile 'info.guardianproject.panic:panic:0.5'
 	compile 'info.guardianproject.trustedintents:trustedintents:0.2'
 	compile 'de.hdodenhof:circleimageview:2.1.0'
-	compile 'com.google.zxing:core:3.2.1'
+	compile 'com.google.zxing:core:3.3.0'
-	provided 'javax.annotation:jsr250-api:1.0'
 	compile 'com.jpardogo.materialtabstrip:library:1.1.0'
-	compile 'com.github.bumptech.glide:glide:3.7.0'
+	compile 'com.github.bumptech.glide:glide:3.8.0'
-	compile 'uk.co.samuelwall:material-tap-target-prompt:1.3.0'
+	compile 'uk.co.samuelwall:material-tap-target-prompt:1.9.2'
+
+	provided 'javax.annotation:jsr250-api:1.0'
 
 	testCompile project(path: ':bramble-core', configuration: 'testOutput')
 	testCompile 'org.robolectric:robolectric:3.0'
-	testCompile 'org.mockito:mockito-core:1.10.19'
+	testCompile 'org.mockito:mockito-core:2.8.9'
 }
 
 dependencyVerification {
@@ -45,20 +43,18 @@ dependencyVerification {
 			'info.guardianproject.panic:panic:a7ed9439826db2e9901649892cf9afbe76f00991b768d8f4c26332d7c9406cb2',
 			'info.guardianproject.trustedintents:trustedintents:6221456d8821a8d974c2acf86306900237cf6afaaa94a4c9c44e161350f80f3e',
 			'de.hdodenhof:circleimageview:bcbc588e19e6dcf8c120b1957776bfe229efba5d2fbe5da7156372eeacf65503',
-			'com.google.zxing:core:b4d82452e7a6bf6ec2698904b332431717ed8f9a850224f295aec89de80f2259',
+			'com.google.zxing:core:bba7724e02a997cec38213af77133ee8e24b0d5cf5fa7ecbc16a4fa93f11ee0d',
-			'com.android.support:support-v4:81ce890f26d35c75ad17d0f998a7e3230330c3b41e0b629566bc744bee89e448',
+			'com.jpardogo.materialtabstrip:library:24d19232b319f8c73e25793432357919a7ed972186f57a3b2c9093ea74ad8311',
+			'com.github.bumptech.glide:glide:750d9e7b940dc0ee48f8680623b55d46e14e8727acc922d7b156e57e7c549655',
+			'uk.co.samuelwall:material-tap-target-prompt:5d4951124366bc5c52e57beaa294db7611f0aa2a8d80e0163e1383e1966ba5b2',
 			'com.android.support:appcompat-v7:00f9d93acacd6731f309724054bf51492814b4b2869f16d7d5c0038dcb8c9a0d',
 			'com.android.support:preference-v14:44881bb46094e86d0bc2426f205419674a5b4eb514b44b5a4659b5de29f71eb7',
 			'com.android.support:design:003e0c0bea0a6891f8b2bc43f20ae7af2a49a17363e5bb10df5ee0bae12fa686',
-			'com.android.support:support-annotations:e91a88dd0c5e99069b7f09d4a46b5e06f1e9c4c72fc0a8e987e25d86af480f01',
+			'com.android.support:cardview-v7:4595f1c4a28cfa083b6c0920ad4d49e1c2ca4b8302a955e548f68eb63b74931b',
 			'com.android.support:animated-vector-drawable:06d1963b85aa917099d7757e6a7b3e4dc06889413dc747f625ae8683606db3a1',
 			'com.android.support:support-vector-drawable:799bafe4c3de812386f0b291f744d5d6876452722dd40189b9ab87dbbf594ea1',
 			'com.android.support:recyclerview-v7:44040a888e23e0c93162a3377cfe06751080e3c22d369ab0d4301ef60d63b0fe',
 			'com.android.support:preference-v7:775101bd07bd052e455761c5c5d9523d7ad59f2f320e3e8cbde241fd6b1d6025',
-			'com.android.support:cardview-v7:4595f1c4a28cfa083b6c0920ad4d49e1c2ca4b8302a955e548f68eb63b74931b',
-			'com.jpardogo.materialtabstrip:library:24d19232b319f8c73e25793432357919a7ed972186f57a3b2c9093ea74ad8311',
-			'com.github.bumptech.glide:glide:76ef123957b5fbaebb05fcbe6606dd58c3bc3fcdadb257f99811d0ac9ea9b88b',
-			'uk.co.samuelwall:material-tap-target-prompt:f67e1caead12a914525b32cbf6da52a96b93ff89573f93cb41102ef3130fb64a',
 	]
 }
 
@@ -82,7 +78,10 @@ android {
 	defaultConfig {
 		minSdkVersion 14
 		targetSdkVersion 22
-		resValue "string", "app_package", "org.briarproject.briar"
+		versionCode 1607
+		versionName "0.16.7"
+		applicationId "org.briarproject.briar.beta"
+		resValue "string", "app_package", "org.briarproject.briar.beta"
 		buildConfigField "String", "GitHash", "\"${getGitHash()}\""
 	}
 
@@ -107,5 +106,6 @@ android {
 	lintOptions {
 		warning 'MissingTranslation'
 		warning 'ImpliedQuantity'
+		warning 'ExtraTranslation'
 	}
 }

briar-android/src/main/AndroidManifest.xml

@@ -1,9 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest
 	package="org.briarproject.briar"
-	xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:android="http://schemas.android.com/apk/res/android">
-	android:versionCode="13"
-	android:versionName="0.13">
 
 	<uses-feature android:name="android.hardware.bluetooth"/>
 	<uses-feature android:name="android.hardware.camera" />
@@ -21,7 +19,7 @@
 	<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
 
 	<application
-		android:name=".android.BriarApplicationImpl"
+		android:name="org.briarproject.briar.android.BriarApplicationImpl"
 		android:allowBackup="false"
 		android:icon="@mipmap/ic_launcher_round"
 		android:label="@string/app_name"
@@ -29,7 +27,7 @@
 		android:theme="@style/BriarTheme">
 
 		<service
-			android:name=".android.BriarService"
+			android:name="org.briarproject.briar.android.BriarService"
 			android:exported="false">
 			<intent-filter>
 				<action android:name="org.briarproject.briar.android.BriarService"/>
@@ -37,7 +35,7 @@
 		</service>
 
 		<activity
-			android:name=".android.reporting.DevReportActivity"
+			android:name="org.briarproject.briar.android.reporting.DevReportActivity"
 			android:excludeFromRecents="true"
 			android:exported="false"
 			android:finishOnTaskLaunch="true"
@@ -49,24 +47,24 @@
 		</activity>
 
 		<activity
-			android:name=".android.splash.ExpiredActivity"
+			android:name="org.briarproject.briar.android.splash.ExpiredActivity"
 			android:label="@string/app_name">
 		</activity>
 
 		<activity
-			android:name=".android.login.PasswordActivity"
+			android:name="org.briarproject.briar.android.login.PasswordActivity"
 			android:label="@string/app_name"
 			android:windowSoftInputMode="stateVisible">
 		</activity>
 
 		<activity
-			android:name=".android.login.SetupActivity"
+			android:name="org.briarproject.briar.android.login.SetupActivity"
 			android:label="@string/setup_title"
 			android:windowSoftInputMode="adjustResize">
 		</activity>
 
 		<activity
-			android:name=".android.splash.SplashScreenActivity"
+			android:name="org.briarproject.briar.android.splash.SplashScreenActivity"
 			android:theme="@style/BriarTheme.NoActionBar"
 			android:label="@string/app_name">
 			<intent-filter>
@@ -76,268 +74,268 @@
 		</activity>
 
 		<activity
-			android:name=".android.navdrawer.NavDrawerActivity"
+			android:name="org.briarproject.briar.android.navdrawer.NavDrawerActivity"
 			android:theme="@style/BriarTheme.NoActionBar"
 		    android:launchMode="singleTop">
 		</activity>
 
 		<activity
-			android:name=".android.contact.ConversationActivity"
+			android:name="org.briarproject.briar.android.contact.ConversationActivity"
 			android:label="@string/app_name"
 			android:theme="@style/BriarTheme.NoActionBar"
-			android:parentActivityName=".android.navdrawer.NavDrawerActivity"
+			android:parentActivityName="org.briarproject.briar.android.navdrawer.NavDrawerActivity"
 			android:windowSoftInputMode="stateHidden|adjustResize">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.navdrawer.NavDrawerActivity"
+				android:value="org.briarproject.briar.android.navdrawer.NavDrawerActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.privategroup.creation.CreateGroupActivity"
+			android:name="org.briarproject.briar.android.privategroup.creation.CreateGroupActivity"
 			android:label="@string/groups_create_group_title"
-			android:parentActivityName=".android.navdrawer.NavDrawerActivity"
+			android:parentActivityName="org.briarproject.briar.android.navdrawer.NavDrawerActivity"
 			android:windowSoftInputMode="adjustResize">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.navdrawer.NavDrawerActivity"
+				android:value="org.briarproject.briar.android.navdrawer.NavDrawerActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.privategroup.conversation.GroupActivity"
+			android:name="org.briarproject.briar.android.privategroup.conversation.GroupActivity"
 			android:label="@string/app_name"
-			android:parentActivityName=".android.navdrawer.NavDrawerActivity"
+			android:parentActivityName="org.briarproject.briar.android.navdrawer.NavDrawerActivity"
 			android:theme="@style/BriarTheme.NoActionBar"
 			android:windowSoftInputMode="adjustResize|stateHidden">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.navdrawer.NavDrawerActivity"
+				android:value="org.briarproject.briar.android.navdrawer.NavDrawerActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.privategroup.invitation.GroupInvitationActivity"
+			android:name="org.briarproject.briar.android.privategroup.invitation.GroupInvitationActivity"
 			android:label="@string/groups_invitations_title"
-			android:parentActivityName=".android.navdrawer.NavDrawerActivity">
+			android:parentActivityName="org.briarproject.briar.android.navdrawer.NavDrawerActivity">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.navdrawer.NavDrawerActivity"/>
+				android:value="org.briarproject.briar.android.navdrawer.NavDrawerActivity"/>
 		</activity>
 
 			<activity
-			android:name=".android.privategroup.memberlist.GroupMemberListActivity"
+			android:name="org.briarproject.briar.android.privategroup.memberlist.GroupMemberListActivity"
 			android:label="@string/groups_member_list"
-			android:parentActivityName=".android.privategroup.conversation.GroupActivity"
+			android:parentActivityName="org.briarproject.briar.android.privategroup.conversation.GroupActivity"
 			android:windowSoftInputMode="adjustResize|stateHidden">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.privategroup.conversation.GroupActivity"
+				android:value="org.briarproject.briar.android.privategroup.conversation.GroupActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.privategroup.reveal.RevealContactsActivity"
+			android:name="org.briarproject.briar.android.privategroup.reveal.RevealContactsActivity"
 			android:label="@string/groups_reveal_contacts"
-			android:parentActivityName=".android.privategroup.conversation.GroupActivity"
+			android:parentActivityName="org.briarproject.briar.android.privategroup.conversation.GroupActivity"
 			android:windowSoftInputMode="adjustResize|stateAlwaysHidden">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.privategroup.conversation.GroupActivity"
+				android:value="org.briarproject.briar.android.privategroup.conversation.GroupActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.privategroup.creation.GroupInviteActivity"
+			android:name="org.briarproject.briar.android.privategroup.creation.GroupInviteActivity"
 			android:label="@string/groups_invite_members"
-			android:parentActivityName=".android.privategroup.conversation.GroupActivity"
+			android:parentActivityName="org.briarproject.briar.android.privategroup.conversation.GroupActivity"
 			android:windowSoftInputMode="adjustResize|stateHidden">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.privategroup.conversation.GroupActivity"/>
+				android:value="org.briarproject.briar.android.privategroup.conversation.GroupActivity"/>
 		</activity>
 
 		<activity
-			android:name=".android.sharing.ForumInvitationActivity"
+			android:name="org.briarproject.briar.android.sharing.ForumInvitationActivity"
 			android:label="@string/forum_invitations_title"
-			android:parentActivityName=".android.navdrawer.NavDrawerActivity">
+			android:parentActivityName="org.briarproject.briar.android.navdrawer.NavDrawerActivity">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.navdrawer.NavDrawerActivity"
+				android:value="org.briarproject.briar.android.navdrawer.NavDrawerActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.sharing.BlogInvitationActivity"
+			android:name="org.briarproject.briar.android.sharing.BlogInvitationActivity"
 			android:label="@string/blogs_sharing_invitations_title"
-			android:parentActivityName=".android.contact.ConversationActivity">
+			android:parentActivityName="org.briarproject.briar.android.contact.ConversationActivity">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.contact.ConversationActivity"
+				android:value="org.briarproject.briar.android.contact.ConversationActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.forum.CreateForumActivity"
+			android:name="org.briarproject.briar.android.forum.CreateForumActivity"
 			android:label="@string/create_forum_title"
-			android:parentActivityName=".android.navdrawer.NavDrawerActivity"
+			android:parentActivityName="org.briarproject.briar.android.navdrawer.NavDrawerActivity"
-			android:windowSoftInputMode="stateVisible">
+			android:windowSoftInputMode="adjustResize">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.navdrawer.NavDrawerActivity"
+				android:value="org.briarproject.briar.android.navdrawer.NavDrawerActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.forum.ForumActivity"
+			android:name="org.briarproject.briar.android.forum.ForumActivity"
 			android:label="@string/app_name"
-			android:parentActivityName=".android.navdrawer.NavDrawerActivity"
+			android:parentActivityName="org.briarproject.briar.android.navdrawer.NavDrawerActivity"
 			android:theme="@style/BriarTheme.NoActionBar"
 			android:windowSoftInputMode="adjustResize|stateHidden">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.navdrawer.NavDrawerActivity"
+				android:value="org.briarproject.briar.android.navdrawer.NavDrawerActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.sharing.ShareForumActivity"
+			android:name="org.briarproject.briar.android.sharing.ShareForumActivity"
 			android:label="@string/activity_share_toolbar_header"
-			android:parentActivityName=".android.forum.ForumActivity"
+			android:parentActivityName="org.briarproject.briar.android.forum.ForumActivity"
 			android:windowSoftInputMode="adjustResize|stateHidden">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.forum.ForumActivity"
+				android:value="org.briarproject.briar.android.forum.ForumActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.sharing.ShareBlogActivity"
+			android:name="org.briarproject.briar.android.sharing.ShareBlogActivity"
 			android:label="@string/activity_share_toolbar_header"
-			android:parentActivityName=".android.blog.BlogActivity"
+			android:parentActivityName="org.briarproject.briar.android.blog.BlogActivity"
 			android:windowSoftInputMode="adjustResize|stateHidden">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.blog.BlogActivity"
+				android:value="org.briarproject.briar.android.blog.BlogActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.sharing.ForumSharingStatusActivity"
+			android:name="org.briarproject.briar.android.sharing.ForumSharingStatusActivity"
 			android:label="@string/sharing_status"
-			android:parentActivityName=".android.forum.ForumActivity">
+			android:parentActivityName="org.briarproject.briar.android.forum.ForumActivity">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.forum.ForumActivity"
+				android:value="org.briarproject.briar.android.forum.ForumActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.sharing.BlogSharingStatusActivity"
+			android:name="org.briarproject.briar.android.sharing.BlogSharingStatusActivity"
 			android:label="@string/sharing_status"
-			android:parentActivityName=".android.blog.BlogActivity">
+			android:parentActivityName="org.briarproject.briar.android.blog.BlogActivity">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.blog.BlogActivity"
+				android:value="org.briarproject.briar.android.blog.BlogActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.blog.BlogActivity"
+			android:name="org.briarproject.briar.android.blog.BlogActivity"
-			android:parentActivityName=".android.navdrawer.NavDrawerActivity"
+			android:parentActivityName="org.briarproject.briar.android.navdrawer.NavDrawerActivity"
 			android:theme="@style/BriarTheme.NoActionBar">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.navdrawer.NavDrawerActivity"/>
+				android:value="org.briarproject.briar.android.navdrawer.NavDrawerActivity"/>
 		</activity>
 
 		<activity
-			android:name=".android.blog.WriteBlogPostActivity"
+			android:name="org.briarproject.briar.android.blog.WriteBlogPostActivity"
 			android:label="@string/blogs_write_blog_post"
-			android:parentActivityName=".android.blog.BlogActivity"
+			android:parentActivityName="org.briarproject.briar.android.blog.BlogActivity"
 			android:windowSoftInputMode="stateVisible|adjustResize">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.blog.BlogActivity"
+				android:value="org.briarproject.briar.android.blog.BlogActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.blog.ReblogActivity"
+			android:name="org.briarproject.briar.android.blog.ReblogActivity"
 			android:label="@string/blogs_reblog_button"
-			android:parentActivityName=".android.blog.BlogActivity"
+			android:parentActivityName="org.briarproject.briar.android.blog.BlogActivity"
 			android:windowSoftInputMode="stateHidden">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.blog.BlogActivity"
+				android:value="org.briarproject.briar.android.blog.BlogActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.blog.RssFeedImportActivity"
+			android:name="org.briarproject.briar.android.blog.RssFeedImportActivity"
 			android:label="@string/blogs_rss_feeds_import"
-			android:parentActivityName=".android.navdrawer.NavDrawerActivity"
+			android:parentActivityName="org.briarproject.briar.android.navdrawer.NavDrawerActivity"
 			android:windowSoftInputMode="stateVisible|adjustResize">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.navdrawer.NavDrawerActivity"
+				android:value="org.briarproject.briar.android.navdrawer.NavDrawerActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.blog.RssFeedManageActivity"
+			android:name="org.briarproject.briar.android.blog.RssFeedManageActivity"
 			android:label="@string/blogs_rss_feeds_manage"
-			android:parentActivityName=".android.navdrawer.NavDrawerActivity">
+			android:parentActivityName="org.briarproject.briar.android.navdrawer.NavDrawerActivity">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.navdrawer.NavDrawerActivity"
+				android:value="org.briarproject.briar.android.navdrawer.NavDrawerActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.invitation.AddContactActivity"
+			android:name="org.briarproject.briar.android.invitation.AddContactActivity"
 			android:label="@string/add_contact_title"
-			android:parentActivityName=".android.navdrawer.NavDrawerActivity">
+			android:parentActivityName="org.briarproject.briar.android.navdrawer.NavDrawerActivity">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.navdrawer.NavDrawerActivity"
+				android:value="org.briarproject.briar.android.navdrawer.NavDrawerActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.keyagreement.KeyAgreementActivity"
+			android:name="org.briarproject.briar.android.keyagreement.KeyAgreementActivity"
 			android:label="@string/add_contact_title"
 			android:theme="@style/BriarTheme.NoActionBar"
-			android:parentActivityName=".android.navdrawer.NavDrawerActivity">
+			android:parentActivityName="org.briarproject.briar.android.navdrawer.NavDrawerActivity">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.navdrawer.NavDrawerActivity"/>
+				android:value="org.briarproject.briar.android.navdrawer.NavDrawerActivity"/>
 		</activity>
 
 		<activity
-			android:name=".android.introduction.IntroductionActivity"
+			android:name="org.briarproject.briar.android.introduction.IntroductionActivity"
 			android:label="@string/introduction_activity_title"
-			android:parentActivityName=".android.contact.ConversationActivity"
+			android:parentActivityName="org.briarproject.briar.android.contact.ConversationActivity"
 			android:windowSoftInputMode="stateHidden|adjustResize">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.contact.ConversationActivity"
+				android:value="org.briarproject.briar.android.contact.ConversationActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.StartupFailureActivity"
+			android:name="org.briarproject.briar.android.StartupFailureActivity"
 			android:label="@string/startup_failed_activity_title">
 		</activity>
 
 		<activity
-			android:name=".android.settings.SettingsActivity"
+			android:name="org.briarproject.briar.android.settings.SettingsActivity"
 			android:label="@string/settings_button"
-			android:parentActivityName=".android.navdrawer.NavDrawerActivity"
+			android:parentActivityName="org.briarproject.briar.android.navdrawer.NavDrawerActivity"
 			android:permission="android.permission.READ_NETWORK_USAGE_HISTORY">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.navdrawer.NavDrawerActivity"
+				android:value="org.briarproject.briar.android.navdrawer.NavDrawerActivity"
 				/>
 			<intent-filter>
 				<action android:name="android.intent.action.MANAGE_NETWORK_USAGE"/>
@@ -346,27 +344,27 @@
 		</activity>
 
 		<activity
-			android:name=".android.login.ChangePasswordActivity"
+			android:name="org.briarproject.briar.android.login.ChangePasswordActivity"
 			android:label="@string/change_password"
-			android:parentActivityName=".android.settings.SettingsActivity">
+			android:parentActivityName="org.briarproject.briar.android.settings.SettingsActivity">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.settings.SettingsActivity"
+				android:value="org.briarproject.briar.android.settings.SettingsActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.panic.PanicPreferencesActivity"
+			android:name="org.briarproject.briar.android.panic.PanicPreferencesActivity"
 			android:label="@string/panic_setting"
-			android:parentActivityName=".android.settings.SettingsActivity">
+			android:parentActivityName="org.briarproject.briar.android.settings.SettingsActivity">
 			<meta-data
 				android:name="android.support.PARENT_ACTIVITY"
-				android:value=".android.settings.SettingsActivity"
+				android:value="org.briarproject.briar.android.settings.SettingsActivity"
 				/>
 		</activity>
 
 		<activity
-			android:name=".android.panic.PanicResponderActivity"
+			android:name="org.briarproject.briar.android.panic.PanicResponderActivity"
 			android:noHistory="true"
 			android:theme="@android:style/Theme.NoDisplay">
 			<!-- this can never have launchMode singleTask or singleInstance! -->
@@ -377,7 +375,7 @@
 		</activity>
 
 		<activity
-			android:name=".android.panic.ExitActivity"
+			android:name="org.briarproject.briar.android.panic.ExitActivity"
 			android:theme="@android:style/Theme.NoDisplay">
 		</activity>
 

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

@@ -32,6 +32,7 @@ import org.briarproject.briar.api.android.ScreenFilterMonitor;
 import org.briarproject.briar.api.blog.BlogManager;
 import org.briarproject.briar.api.blog.BlogPostFactory;
 import org.briarproject.briar.api.blog.BlogSharingManager;
+import org.briarproject.briar.api.client.MessageTracker;
 import org.briarproject.briar.api.feed.FeedManager;
 import org.briarproject.briar.api.forum.ForumManager;
 import org.briarproject.briar.api.forum.ForumSharingManager;
@@ -78,6 +79,8 @@ public interface AndroidComponent
 	@DatabaseExecutor
 	Executor databaseExecutor();
 
+	MessageTracker messageTracker();
+
 	LifecycleManager lifecycleManager();
 
 	IdentityManager identityManager();

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

@@ -61,6 +61,7 @@ import static android.content.Context.NOTIFICATION_SERVICE;
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 import static android.support.v4.app.NotificationCompat.CATEGORY_MESSAGE;
 import static android.support.v4.app.NotificationCompat.CATEGORY_SOCIAL;
+import static android.support.v4.app.NotificationCompat.VISIBILITY_PRIVATE;
 import static android.support.v4.app.NotificationCompat.VISIBILITY_SECRET;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
@@ -327,6 +328,11 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 			}
 			if (Build.VERSION.SDK_INT >= 21) {
 				b.setCategory(CATEGORY_MESSAGE);
+				boolean showOnLockScreen =
+						settings.getBoolean(PREF_NOTIFY_LOCK_SCREEN, false);
+				if (showOnLockScreen)
+					b.setVisibility(VISIBILITY_PRIVATE);
+				else
 					b.setVisibility(VISIBILITY_SECRET);
 			}
 			Object o = appContext.getSystemService(NOTIFICATION_SERVICE);
@@ -347,17 +353,6 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 		return defaults;
 	}
 
-	@Override
-	public void clearAllContactNotifications() {
-		androidExecutor.runOnUiThread(new Runnable() {
-			@Override
-			public void run() {
-				clearContactNotification();
-				clearIntroductionSuccessNotification();
-			}
-		});
-	}
-
 	@UiThread
 	private void showGroupMessageNotification(final GroupId g) {
 		androidExecutor.runOnUiThread(new Runnable() {
@@ -432,6 +427,11 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 			}
 			if (Build.VERSION.SDK_INT >= 21) {
 				b.setCategory(CATEGORY_SOCIAL);
+				boolean showOnLockScreen =
+						settings.getBoolean(PREF_NOTIFY_LOCK_SCREEN, false);
+				if (showOnLockScreen)
+					b.setVisibility(VISIBILITY_PRIVATE);
+				else
 					b.setVisibility(VISIBILITY_SECRET);
 			}
 			Object o = appContext.getSystemService(NOTIFICATION_SERVICE);
@@ -440,16 +440,6 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 		}
 	}
 
-	@Override
-	public void clearAllGroupMessageNotifications() {
-		androidExecutor.runOnUiThread(new Runnable() {
-			@Override
-			public void run() {
-				clearGroupMessageNotification();
-			}
-		});
-	}
-
 	@UiThread
 	private void showForumPostNotification(final GroupId g) {
 		androidExecutor.runOnUiThread(new Runnable() {
@@ -524,6 +514,11 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 			}
 			if (Build.VERSION.SDK_INT >= 21) {
 				b.setCategory(CATEGORY_SOCIAL);
+				boolean showOnLockScreen =
+						settings.getBoolean(PREF_NOTIFY_LOCK_SCREEN, false);
+				if (showOnLockScreen)
+					b.setVisibility(VISIBILITY_PRIVATE);
+				else
 					b.setVisibility(VISIBILITY_SECRET);
 			}
 			Object o = appContext.getSystemService(NOTIFICATION_SERVICE);
@@ -532,16 +527,6 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 		}
 	}
 
-	@Override
-	public void clearAllForumPostNotifications() {
-		androidExecutor.runOnUiThread(new Runnable() {
-			@Override
-			public void run() {
-				clearForumPostNotification();
-			}
-		});
-	}
-
 	@UiThread
 	private void showBlogPostNotification(final GroupId g) {
 		androidExecutor.runOnUiThread(new Runnable() {
@@ -602,6 +587,11 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 			b.setContentIntent(t.getPendingIntent(nextRequestId++, 0));
 			if (Build.VERSION.SDK_INT >= 21) {
 				b.setCategory(CATEGORY_SOCIAL);
+				boolean showOnLockScreen =
+						settings.getBoolean(PREF_NOTIFY_LOCK_SCREEN, false);
+				if (showOnLockScreen)
+					b.setVisibility(VISIBILITY_PRIVATE);
+				else
 					b.setVisibility(VISIBILITY_SECRET);
 			}
 			Object o = appContext.getSystemService(NOTIFICATION_SERVICE);
@@ -658,6 +648,11 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 		b.setContentIntent(t.getPendingIntent(nextRequestId++, 0));
 		if (Build.VERSION.SDK_INT >= 21) {
 			b.setCategory(CATEGORY_MESSAGE);
+			boolean showOnLockScreen =
+					settings.getBoolean(PREF_NOTIFY_LOCK_SCREEN, false);
+			if (showOnLockScreen)
+				b.setVisibility(VISIBILITY_PRIVATE);
+			else
 				b.setVisibility(VISIBILITY_SECRET);
 		}
 		Object o = appContext.getSystemService(NOTIFICATION_SERVICE);
@@ -705,68 +700,6 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 		});
 	}
 
-	@Override
-	public void blockAllContactNotifications() {
-		androidExecutor.runOnUiThread(new Runnable() {
-			@Override
-			public void run() {
-				blockContacts = true;
-				blockIntroductions = true;
-			}
-		});
-	}
-
-	@Override
-	public void unblockAllContactNotifications() {
-		androidExecutor.runOnUiThread(new Runnable() {
-			@Override
-			public void run() {
-				blockContacts = false;
-				blockIntroductions = false;
-			}
-		});
-	}
-
-	@Override
-	public void blockAllGroupMessageNotifications() {
-		androidExecutor.runOnUiThread(new Runnable() {
-			@Override
-			public void run() {
-				blockGroups = true;
-			}
-		});
-	}
-
-	@Override
-	public void unblockAllGroupMessageNotifications() {
-		androidExecutor.runOnUiThread(new Runnable() {
-			@Override
-			public void run() {
-				blockGroups = false;
-			}
-		});
-	}
-
-	@Override
-	public void blockAllForumPostNotifications() {
-		androidExecutor.runOnUiThread(new Runnable() {
-			@Override
-			public void run() {
-				blockForums = true;
-			}
-		});
-	}
-
-	@Override
-	public void unblockAllForumPostNotifications() {
-		androidExecutor.runOnUiThread(new Runnable() {
-			@Override
-			public void run() {
-				blockForums = false;
-			}
-		});
-	}
-
 	@Override
 	public void blockAllBlogPostNotifications() {
 		androidExecutor.runOnUiThread(new Runnable() {
@@ -786,5 +719,4 @@ class AndroidNotificationManagerImpl implements AndroidNotificationManager,
 			}
 		});
 	}
-
 }

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

@@ -38,8 +38,6 @@ public class AppModule {
 	static class EagerSingletons {
 		@Inject
 		AndroidNotificationManager androidNotificationManager;
-		@Inject
-		ScreenFilterMonitor screenFilterMonitor;
 	}
 
 	private final Application application;
@@ -171,10 +169,8 @@ public class AppModule {
 	}
 
 	@Provides
-	@Singleton
 	ScreenFilterMonitor provideScreenFilterMonitor(
-			LifecycleManager lifecycleManager, ScreenFilterMonitorImpl sfm) {
+			ScreenFilterMonitorImpl screenFilterMonitor) {
-		lifecycleManager.registerService(sfm);
+		return screenFilterMonitor;
-		return sfm;
 	}
 }

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

@@ -6,5 +6,9 @@ package org.briarproject.briar.android;
  */
 public interface BriarApplication {
 
+	// This build expires on 21 October 2017
+	long EXPIRY_DATE = 1508544000 * 1000L;
+
 	AndroidComponent getApplicationComponent();
+
 }

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

@@ -2,6 +2,9 @@ package org.briarproject.briar.android;
 
 import android.app.Application;
 import android.content.Context;
+import android.os.StrictMode;
+import android.os.StrictMode.ThreadPolicy;
+import android.os.StrictMode.VmPolicy;
 
 import org.acra.ACRA;
 import org.acra.ReportingInteractionMode;
@@ -33,6 +36,8 @@ import static org.acra.ReportField.REPORT_ID;
 import static org.acra.ReportField.STACK_TRACE;
 import static org.acra.ReportField.USER_APP_START_DATE;
 import static org.acra.ReportField.USER_CRASH_DATE;
+import static org.briarproject.briar.android.TestingConstants.DEFAULT_LOG_LEVEL;
+import static org.briarproject.briar.android.TestingConstants.IS_DEBUG_BUILD;
 
 @ReportsCrashes(
 		reportPrimerClass = BriarReportPrimer.class,
@@ -72,6 +77,9 @@ public class BriarApplicationImpl extends Application
 	@Override
 	public void onCreate() {
 		super.onCreate();
+
+		if (IS_DEBUG_BUILD) enableStrictMode();
+		Logger.getLogger("").setLevel(DEFAULT_LOG_LEVEL);
 		LOG.info("Created");
 
 		applicationComponent = DaggerAndroidComponent.builder()
@@ -85,6 +93,17 @@ public class BriarApplicationImpl extends Application
 		AndroidEagerSingletons.initEagerSingletons(applicationComponent);
 	}
 
+	private void enableStrictMode() {
+		ThreadPolicy.Builder threadPolicy = new ThreadPolicy.Builder();
+		threadPolicy.detectAll();
+		threadPolicy.penaltyLog();
+		StrictMode.setThreadPolicy(threadPolicy.build());
+		VmPolicy.Builder vmPolicy = new VmPolicy.Builder();
+		vmPolicy.detectAll();
+		vmPolicy.penaltyLog();
+		StrictMode.setVmPolicy(vmPolicy.build());
+	}
+
 	@Override
 	public AndroidComponent getApplicationComponent() {
 		return applicationComponent;

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

@@ -1,24 +1,13 @@
 package org.briarproject.briar.android;
 
 import android.app.Application;
-import android.content.BroadcastReceiver;
-import android.content.Context;
-import android.content.Intent;
-import android.content.IntentFilter;
-import android.content.SharedPreferences;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
 import android.content.pm.Signature;
-import android.support.annotation.Nullable;
 import android.support.annotation.UiThread;
-import android.support.v7.preference.PreferenceManager;
 
-import org.briarproject.bramble.api.lifecycle.Service;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
-import org.briarproject.bramble.api.lifecycle.ServiceException;
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
-import org.briarproject.bramble.api.system.AndroidExecutor;
 import org.briarproject.bramble.util.StringUtils;
 import org.briarproject.briar.api.android.ScreenFilterMonitor;
 
@@ -27,37 +16,26 @@ import java.io.InputStream;
 import java.security.cert.CertificateException;
 import java.security.cert.CertificateFactory;
 import java.security.cert.X509Certificate;
-import java.util.Collection;
-import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 import java.util.TreeSet;
-import java.util.concurrent.Callable;
-import java.util.concurrent.ExecutionException;
-import java.util.concurrent.Future;
-import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.logging.Logger;
 
+import javax.annotation.Nullable;
 import javax.inject.Inject;
 
 import static android.Manifest.permission.SYSTEM_ALERT_WINDOW;
-import static android.content.Intent.ACTION_PACKAGE_ADDED;
-import static android.content.Intent.EXTRA_REPLACING;
 import static android.content.pm.ApplicationInfo.FLAG_SYSTEM;
 import static android.content.pm.ApplicationInfo.FLAG_UPDATED_SYSTEM_APP;
 import static android.content.pm.PackageManager.GET_PERMISSIONS;
 import static android.content.pm.PackageManager.GET_SIGNATURES;
 import static java.util.logging.Level.WARNING;
 
-@MethodsNotNullByDefault
+@NotNullByDefault
-@ParametersNotNullByDefault
+class ScreenFilterMonitorImpl implements ScreenFilterMonitor {
-public class ScreenFilterMonitorImpl extends BroadcastReceiver
-		implements Service, ScreenFilterMonitor {
 
 	private static final Logger LOG =
 			Logger.getLogger(ScreenFilterMonitorImpl.class.getName());
-	private static final String PREF_SCREEN_FILTER_APPS =
-			"shownScreenFilterApps";
 
 	/*
  	 * Ignore Play Services if it uses this package name and public key - it's
@@ -78,124 +56,17 @@ public class ScreenFilterMonitorImpl extends BroadcastReceiver
 					"82BA35E003C1B4B10DD244A8EE24FFFD333872AB5221985EDAB0FC0D" +
 					"0B145B6AA192858E79020103";
 
-	private final Context appContext;
-	private final AndroidExecutor androidExecutor;
 	private final PackageManager pm;
-	private final SharedPreferences prefs;
-	private final AtomicBoolean used = new AtomicBoolean(false);
-
-	// The following must only be accessed on the UI thread
-	private final Set<String> apps = new HashSet<>();
-	private final Set<String> shownApps;
-	private boolean serviceStarted = false;
 
 	@Inject
-	ScreenFilterMonitorImpl(AndroidExecutor executor, Application app) {
+	ScreenFilterMonitorImpl(Application app) {
-		this.androidExecutor = executor;
+		pm = app.getPackageManager();
-		this.appContext = app;
-		pm = appContext.getPackageManager();
-		prefs = PreferenceManager.getDefaultSharedPreferences(appContext);
-		shownApps = getShownScreenFilterApps();
-	}
-
-	@Override
-	public void startService() throws ServiceException {
-		if (used.getAndSet(true)) throw new IllegalStateException();
-		Future<Void> f = androidExecutor.runOnUiThread(new Callable<Void>() {
-			@Override
-			public Void call() {
-				IntentFilter intentFilter = new IntentFilter();
-				intentFilter.addAction(ACTION_PACKAGE_ADDED);
-				intentFilter.addDataScheme("package");
-				appContext.registerReceiver(ScreenFilterMonitorImpl.this,
-						intentFilter);
-				apps.addAll(getInstalledScreenFilterApps());
-				serviceStarted = true;
-				return null;
-			}
-		});
-		try {
-			f.get();
-		} catch (InterruptedException | ExecutionException e) {
-			throw new ServiceException(e);
-		}
-	}
-
-	@Override
-	public void stopService() throws ServiceException {
-		Future<Void> f = androidExecutor.runOnUiThread(new Callable<Void>() {
-			@Override
-			public Void call() {
-				serviceStarted = false;
-				appContext.unregisterReceiver(ScreenFilterMonitorImpl.this);
-				return null;
-			}
-		});
-		try {
-			f.get();
-		} catch (InterruptedException | ExecutionException e) {
-			throw new ServiceException(e);
-		}
-	}
-
-	private Set<String> getShownScreenFilterApps() {
-		// Result must not be modified
-		Set<String> s = prefs.getStringSet(PREF_SCREEN_FILTER_APPS, null);
-		HashSet<String> result = new HashSet<>();
-		if (s != null) {
-			result.addAll(s);
-		}
-		return result;
-	}
-
-	@Override
-	public void onReceive(Context context, Intent intent) {
-		if (!intent.getBooleanExtra(EXTRA_REPLACING, false)) {
-			final String packageName =
-					intent.getData().getEncodedSchemeSpecificPart();
-			androidExecutor.runOnUiThread(new Runnable() {
-				@Override
-				public void run() {
-					String pkg = isOverlayApp(packageName);
-					if (pkg == null) {
-						return;
-					}
-					apps.add(pkg);
-				}
-			});
-		}
 	}
 
 	@Override
 	@UiThread
 	public Set<String> getApps() {
-		if (!serviceStarted) {
+		Set<String> screenFilterApps = new TreeSet<>();
-			apps.addAll(getInstalledScreenFilterApps());
-		}
-		TreeSet<String> buf = new TreeSet<>();
-		if (apps.isEmpty()) {
-			return buf;
-		}
-		buf.addAll(apps);
-		buf.removeAll(shownApps);
-		return buf;
-	}
-
-	@Override
-	@UiThread
-	public void storeAppsAsShown(Collection<String> s, boolean persistent) {
-		HashSet<String> buf = new HashSet<>(s);
-		shownApps.addAll(buf);
-		if (persistent && !s.isEmpty()) {
-			buf.addAll(getShownScreenFilterApps());
-			prefs.edit()
-					.putStringSet(PREF_SCREEN_FILTER_APPS, buf)
-					.apply();
-		}
-	}
-
-	private Set<String> getInstalledScreenFilterApps() {
-		HashSet<String> screenFilterApps = new HashSet<>();
 		List<PackageInfo> packageInfos =
 				pm.getInstalledPackages(GET_PERMISSIONS);
 		for (PackageInfo packageInfo : packageInfos) {
@@ -209,21 +80,6 @@ public class ScreenFilterMonitorImpl extends BroadcastReceiver
 		return screenFilterApps;
 	}
 
-	// Checks if a package uses the SYSTEM_ALERT_WINDOW permission and if so
-	// returns the app name.
-	@Nullable
-	private String isOverlayApp(String pkg) {
-		try {
-			PackageInfo pkgInfo = pm.getPackageInfo(pkg, GET_PERMISSIONS);
-			if (isOverlayApp(pkgInfo)) {
-				return pkgToString(pkgInfo);
-			}
-		} catch (NameNotFoundException e) {
-			if (LOG.isLoggable(WARNING)) LOG.log(WARNING, e.toString(), e);
-		}
-		return null;
-	}
-
 	// Fetches the application name for a given package.
 	@Nullable
 	private String pkgToString(PackageInfo pkgInfo) {

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

@@ -10,13 +10,21 @@ import static java.util.logging.Level.OFF;
 public interface TestingConstants {
 
 	/**
-	 * Whether this is an alpha or beta build. This should be set to false for
+	 * Whether this is a debug build.
+	 */
+	boolean IS_DEBUG_BUILD = BuildConfig.DEBUG;
+
+	/**
+	 * Whether this is a beta build. This should be set to false for final
 	 * release builds.
 	 */
-	boolean TESTING = BuildConfig.DEBUG;
+	boolean IS_BETA_BUILD = true;
 
-	/** Default log level. */
+	/**
-	Level DEFAULT_LOG_LEVEL = TESTING ? INFO : OFF;
+	 * Default log level. Disable logging for final release builds.
+	 */
+	@SuppressWarnings("ConstantConditions")
+	Level DEFAULT_LOG_LEVEL = IS_DEBUG_BUILD || IS_BETA_BUILD ? INFO : OFF;
 
 	/**
 	 * Whether to prevent screenshots from being taken. Setting this to true
@@ -24,5 +32,5 @@ public interface TestingConstants {
 	 * Unfortunately this also prevents the user from taking screenshots
 	 * intentionally.
 	 */
-	boolean PREVENT_SCREENSHOTS = !TESTING;
+	boolean PREVENT_SCREENSHOTS = !IS_DEBUG_BUILD;
 }

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

@@ -39,7 +39,7 @@ import org.briarproject.briar.android.privategroup.conversation.GroupConversatio
 import org.briarproject.briar.android.privategroup.creation.CreateGroupActivity;
 import org.briarproject.briar.android.privategroup.creation.CreateGroupFragment;
 import org.briarproject.briar.android.privategroup.creation.CreateGroupMessageFragment;
-import org.briarproject.briar.android.privategroup.creation.GroupCreateModule;
+import org.briarproject.briar.android.privategroup.creation.CreateGroupModule;
 import org.briarproject.briar.android.privategroup.creation.GroupInviteActivity;
 import org.briarproject.briar.android.privategroup.creation.GroupInviteFragment;
 import org.briarproject.briar.android.privategroup.invitation.GroupInvitationActivity;
@@ -71,7 +71,7 @@ import dagger.Component;
 @Component(
 		modules = {ActivityModule.class, ForumModule.class, SharingModule.class,
 				BlogModule.class, ContactModule.class, GroupListModule.class,
-				GroupCreateModule.class, GroupInvitationModule.class,
+				CreateGroupModule.class, GroupInvitationModule.class,
 				GroupConversationModule.class, GroupMemberModule.class,
 				GroupRevealModule.class},
 		dependencies = AndroidComponent.class)

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

@@ -2,9 +2,13 @@ package org.briarproject.briar.android.activity;
 
 import android.os.Bundle;
 import android.os.IBinder;
+import android.support.annotation.LayoutRes;
 import android.support.annotation.UiThread;
 import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
 import android.view.View;
+import android.view.ViewGroup;
+import android.view.ViewGroup.LayoutParams;
 import android.view.inputmethod.InputMethodManager;
 
 import org.briarproject.bramble.api.db.DbException;
@@ -13,7 +17,9 @@ import org.briarproject.briar.android.BriarApplication;
 import org.briarproject.briar.android.DestroyableContext;
 import org.briarproject.briar.android.controller.ActivityLifecycleController;
 import org.briarproject.briar.android.forum.ForumModule;
-import org.briarproject.briar.android.fragment.SFDialogFragment;
+import org.briarproject.briar.android.fragment.ScreenFilterDialogFragment;
+import org.briarproject.briar.android.widget.TapSafeFrameLayout;
+import org.briarproject.briar.android.widget.TapSafeFrameLayout.OnTapFilteredListener;
 import org.briarproject.briar.api.android.ScreenFilterMonitor;
 
 import java.util.ArrayList;
@@ -23,21 +29,23 @@ import java.util.Set;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 
+import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
 import static android.view.WindowManager.LayoutParams.FLAG_SECURE;
 import static android.view.inputmethod.InputMethodManager.SHOW_IMPLICIT;
 import static org.briarproject.briar.android.TestingConstants.PREVENT_SCREENSHOTS;
 
 public abstract class BaseActivity extends AppCompatActivity
-		implements DestroyableContext {
+		implements DestroyableContext, OnTapFilteredListener {
+
+	@Inject
+	protected ScreenFilterMonitor screenFilterMonitor;
+
 	protected ActivityComponent activityComponent;
 
 	private final List<ActivityLifecycleController> lifecycleControllers =
 			new ArrayList<>();
 	private boolean destroyed = false;
-
+	private ScreenFilterDialogFragment dialogFrag;
-	@Inject
-	protected ScreenFilterMonitor screenFilterMonitor;
-	private SFDialogFragment dialogFrag;
 
 	public abstract void injectActivity(ActivityComponent component);
 
@@ -65,7 +73,6 @@ public abstract class BaseActivity extends AppCompatActivity
 		for (ActivityLifecycleController alc : lifecycleControllers) {
 			alc.onActivityCreate(this);
 		}
-
 	}
 
 	public ActivityComponent getActivityComponent() {
@@ -97,12 +104,6 @@ public abstract class BaseActivity extends AppCompatActivity
 		}
 	}
 
-	@Override
-	protected void onPostResume() {
-		super.onPostResume();
-		showNewScreenFilterWarning();
-	}
-
 	@Override
 	protected void onPause() {
 		super.onPause();
@@ -112,18 +113,14 @@ public abstract class BaseActivity extends AppCompatActivity
 		}
 	}
 
-	protected void showNewScreenFilterWarning() {
+	private void showScreenFilterWarning() {
-		final Set<String> apps = screenFilterMonitor.getApps();
+		if (dialogFrag != null && dialogFrag.isVisible()) return;
-		if (apps.isEmpty()) {
+		Set<String> apps = screenFilterMonitor.getApps();
-			return;
+		if (apps.isEmpty()) return;
-		}
+		dialogFrag =
-		dialogFrag = SFDialogFragment.newInstance(new ArrayList<>(apps));
+				ScreenFilterDialogFragment.newInstance(new ArrayList<>(apps));
 		dialogFrag.setCancelable(false);
-		dialogFrag.show(getSupportFragmentManager(), "SFDialog");
+		dialogFrag.show(getSupportFragmentManager(), dialogFrag.getTag());
-	}
-
-	public void rememberShownApps(ArrayList<String> s, boolean permanent) {
-		screenFilterMonitor.storeAppsAsShown(s, permanent);
 	}
 
 	@Override
@@ -161,4 +158,70 @@ public abstract class BaseActivity extends AppCompatActivity
 		supportFinishAfterTransition();
 	}
 
+	/*
+	 * Wraps the given view in a wrapper that notifies this activity when an
+	 * obscured touch has been filtered, and returns the wrapper.
+	 */
+	private View makeTapSafeWrapper(View v) {
+		TapSafeFrameLayout wrapper = new TapSafeFrameLayout(this);
+		wrapper.setLayoutParams(new LayoutParams(MATCH_PARENT, MATCH_PARENT));
+		wrapper.setOnTapFilteredListener(this);
+		wrapper.addView(v);
+		return wrapper;
+	}
+
+	/*
+	 * Finds the AppCompat toolbar, if any, and configures it to filter
+	 * obscured touches. If a custom toolbar is used, it will be part of the
+	 * content view and thus protected by the wrapper. But the default toolbar
+	 * is outside the wrapper.
+	 */
+	private void protectToolbar() {
+		View decorView = getWindow().getDecorView();
+		if (decorView instanceof ViewGroup) {
+			Toolbar toolbar = findToolbar((ViewGroup) decorView);
+			if (toolbar != null) toolbar.setFilterTouchesWhenObscured(true);
+		}
+	}
+
+	@Nullable
+	private Toolbar findToolbar(ViewGroup vg) {
+		for (int i = 0, len = vg.getChildCount(); i < len; i++) {
+			View child = vg.getChildAt(i);
+			if (child instanceof Toolbar) return (Toolbar) child;
+			if (child instanceof ViewGroup) {
+				Toolbar toolbar = findToolbar((ViewGroup) child);
+				if (toolbar != null) return toolbar;
+			}
+		}
+		return null;
+	}
+
+	@Override
+	public void setContentView(@LayoutRes int layoutRes) {
+		setContentView(getLayoutInflater().inflate(layoutRes, null));
+	}
+
+	@Override
+	public void setContentView(View v) {
+		super.setContentView(makeTapSafeWrapper(v));
+		protectToolbar();
+	}
+
+	@Override
+	public void setContentView(View v, LayoutParams layoutParams) {
+		super.setContentView(makeTapSafeWrapper(v), layoutParams);
+		protectToolbar();
+	}
+
+	@Override
+	public void addContentView(View v, LayoutParams layoutParams) {
+		super.addContentView(makeTapSafeWrapper(v), layoutParams);
+		protectToolbar();
+	}
+
+	@Override
+	public void onTapFiltered() {
+		showScreenFilterWarning();
+	}
 }

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

@@ -3,7 +3,6 @@ package org.briarproject.briar.android.activity;
 import android.annotation.SuppressLint;
 import android.content.Intent;
 import android.os.Build;
-import android.support.annotation.Nullable;
 import android.support.v7.app.ActionBar;
 import android.support.v7.widget.Toolbar;
 import android.transition.Slide;
@@ -21,6 +20,7 @@ import org.briarproject.briar.android.panic.ExitActivity;
 
 import java.util.logging.Logger;
 
+import javax.annotation.Nullable;
 import javax.inject.Inject;
 
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TASK;

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

@@ -1,5 +1,6 @@
 package org.briarproject.briar.android.blog;
 
+import android.content.Intent;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Looper;
@@ -20,8 +21,10 @@ import java.util.logging.Logger;
 
 import javax.annotation.Nullable;
 
+import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 import static android.view.View.INVISIBLE;
 import static android.view.View.VISIBLE;
+import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 import static org.briarproject.briar.android.util.UiUtils.MIN_DATE_RESOLUTION;
 
 @UiThread
@@ -57,7 +60,20 @@ abstract class BasePostFragment extends BaseFragment {
 				false);
 		progressBar = (ProgressBar) view.findViewById(R.id.progressBar);
 		progressBar.setVisibility(VISIBLE);
-		ui = new BlogPostViewHolder(view);
+		ui = new BlogPostViewHolder(view, true, new OnBlogPostClickListener() {
+			@Override
+			public void onBlogPostClick(BlogPostItem post) {
+				// We're already there
+			}
+
+			@Override
+			public void onAuthorClick(BlogPostItem post) {
+				Intent i = new Intent(getContext(), BlogActivity.class);
+				i.putExtra(GROUP_ID, post.getGroupId().getBytes());
+				i.setFlags(FLAG_ACTIVITY_CLEAR_TOP);
+				getContext().startActivity(i);
+			}
+		});
 		return view;
 	}
 

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

@@ -2,7 +2,6 @@ package org.briarproject.briar.android.blog;
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
 import android.support.v7.widget.Toolbar;
 import android.view.View;
 
@@ -15,6 +14,7 @@ import org.briarproject.briar.android.activity.BriarActivity;
 import org.briarproject.briar.android.fragment.BaseFragment.BaseFragmentListener;
 import org.briarproject.briar.android.sharing.BlogSharingStatusActivity;
 
+import javax.annotation.Nullable;
 import javax.inject.Inject;
 
 @MethodsNotNullByDefault

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

@@ -106,7 +106,7 @@ class BlogControllerImpl extends BaseControllerImpl
 			BlogInvitationResponseReceivedEvent b =
 					(BlogInvitationResponseReceivedEvent) e;
 			InvitationResponse r = b.getResponse();
-			if (r.getGroupId().equals(groupId) && r.wasAccepted()) {
+			if (r.getShareableId().equals(groupId) && r.wasAccepted()) {
 				LOG.info("Blog invitation accepted");
 				onBlogInvitationAccepted(b.getContactId());
 			}
@@ -169,7 +169,7 @@ class BlogControllerImpl extends BaseControllerImpl
 					LocalAuthor a = identityManager.getLocalAuthor();
 					Blog b = blogManager.getBlog(groupId);
 					boolean ours = a.getId().equals(b.getAuthor().getId());
-					boolean removable = blogManager.canBeRemoved(groupId);
+					boolean removable = blogManager.canBeRemoved(b);
 					BlogItem blog = new BlogItem(b, ours, removable);
 					long duration = System.currentTimeMillis() - now;
 					if (LOG.isLoggable(INFO))

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

@@ -27,7 +27,6 @@ import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BriarActivity;
 import org.briarproject.briar.android.blog.BlogController.BlogSharingListener;
-import org.briarproject.briar.android.blog.BlogPostAdapter.OnBlogPostClickListener;
 import org.briarproject.briar.android.controller.SharingController;
 import org.briarproject.briar.android.controller.handler.UiResultExceptionHandler;
 import org.briarproject.briar.android.fragment.BaseFragment;
@@ -216,10 +215,19 @@ public class BlogFragment extends BaseFragment
 		showNextFragment(f);
 	}
 
+	@Override
+	public void onAuthorClick(BlogPostItem post) {
+		if (post.getGroupId().equals(groupId)) return; // We're already there
+		Intent i = new Intent(getContext(), BlogActivity.class);
+		i.putExtra(GROUP_ID, post.getGroupId().getBytes());
+		i.setFlags(FLAG_ACTIVITY_CLEAR_TOP);
+		getContext().startActivity(i);
+	}
+
 	private void loadBlogPosts(final boolean reload) {
 		blogController.loadBlogPosts(
-				new UiResultExceptionHandler<Collection<BlogPostItem>, DbException>(
+				new UiResultExceptionHandler<Collection<BlogPostItem>,
-						this) {
+						DbException>(this) {
 					@Override
 					public void onResultUi(Collection<BlogPostItem> posts) {
 						if (posts.isEmpty()) {
@@ -257,13 +265,13 @@ public class BlogFragment extends BaseFragment
 	}
 
 	private void setToolbarTitle(Author a) {
-		String title = getString(R.string.blogs_personal_blog, a.getName());
+		getActivity().setTitle(a.getName());
-		getActivity().setTitle(title);
 	}
 
 	private void loadSharedContacts() {
 		blogController.loadSharingContacts(
-				new UiResultExceptionHandler<Collection<ContactId>, DbException>(this) {
+				new UiResultExceptionHandler<Collection<ContactId>,
+						DbException>(this) {
 					@Override
 					public void onResultUi(Collection<ContactId> contacts) {
 						sharingController.addAll(contacts);

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

@@ -23,8 +23,7 @@ class BlogPostAdapter
 			int viewType) {
 		View v = LayoutInflater.from(ctx).inflate(
 				R.layout.list_item_blog_post, parent, false);
-		BlogPostViewHolder ui = new BlogPostViewHolder(v);
+		BlogPostViewHolder ui = new BlogPostViewHolder(v, false, listener);
-		ui.setOnBlogPostClickListener(listener);
 		return ui;
 	}
 
@@ -48,8 +47,4 @@ class BlogPostAdapter
 		return a.getId().equals(b.getId());
 	}
 
-	interface OnBlogPostClickListener {
-		void onBlogPostClick(BlogPostItem post);
-	}
-
 }

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

@@ -8,14 +8,16 @@ import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.briar.android.activity.ActivityComponent;
+import org.briarproject.briar.android.blog.BaseController.BlogListener;
 import org.briarproject.briar.android.controller.handler.UiResultExceptionHandler;
+import org.briarproject.briar.api.blog.BlogPostHeader;
 
 import javax.inject.Inject;
 
 @UiThread
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
-public class BlogPostFragment extends BasePostFragment {
+public class BlogPostFragment extends BasePostFragment implements BlogListener {
 
 	private static final String TAG = BlogPostFragment.class.getName();
 
@@ -40,6 +42,7 @@ public class BlogPostFragment extends BasePostFragment {
 	@Override
 	public void injectFragment(ActivityComponent component) {
 		component.inject(this);
+		blogController.setBlogListener(this);
 	}
 
 	@Override
@@ -59,4 +62,15 @@ public class BlogPostFragment extends BasePostFragment {
 					}
 				});
 	}
+
+	@Override
+	public void onBlogPostAdded(BlogPostHeader header, boolean local) {
+		// doesn't matter here
+	}
+
+	@Override
+	public void onBlogRemoved() {
+		finish();
+	}
+
 }

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

@@ -4,6 +4,7 @@ import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Build;
+import android.support.annotation.NonNull;
 import android.support.annotation.UiThread;
 import android.support.v4.app.ActivityCompat;
 import android.support.v4.app.ActivityOptionsCompat;
@@ -20,7 +21,6 @@ import android.widget.TextView;
 import org.briarproject.bramble.api.identity.Author;
 import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.briar.R;
-import org.briarproject.briar.android.blog.BlogPostAdapter.OnBlogPostClickListener;
 import org.briarproject.briar.android.view.AuthorView;
 import org.briarproject.briar.api.blog.BlogCommentHeader;
 import org.briarproject.briar.api.blog.BlogPostHeader;
@@ -48,11 +48,16 @@ class BlogPostViewHolder extends RecyclerView.ViewHolder {
 	private final ImageView reblogButton;
 	private final TextView body;
 	private final ViewGroup commentContainer;
+	private final boolean fullText;
 
-	private OnBlogPostClickListener listener;
+	@NonNull
+	private final OnBlogPostClickListener listener;
 
-	BlogPostViewHolder(View v) {
+	BlogPostViewHolder(View v, boolean fullText,
+			@NonNull OnBlogPostClickListener listener) {
 		super(v);
+		this.fullText = fullText;
+		this.listener = listener;
 
 		ctx = v.getContext();
 		layout = (ViewGroup) v.findViewById(R.id.postLayout);
@@ -64,10 +69,6 @@ class BlogPostViewHolder extends RecyclerView.ViewHolder {
 				(ViewGroup) v.findViewById(R.id.commentContainer);
 	}
 
-	void setOnBlogPostClickListener(OnBlogPostClickListener listener) {
-		this.listener = listener;
-	}
-
 	void setVisibility(int visibility) {
 		layout.setVisibility(visibility);
 	}
@@ -92,7 +93,7 @@ class BlogPostViewHolder extends RecyclerView.ViewHolder {
 		if (item == null) return;
 
 		setTransitionName(item.getId());
-		if (listener != null) {
+		if (!fullText) {
 			layout.setClickable(true);
 			layout.setOnClickListener(new OnClickListener() {
 				@Override
@@ -111,15 +112,20 @@ class BlogPostViewHolder extends RecyclerView.ViewHolder {
 		author.setPersona(
 				item.isRssFeed() ? AuthorView.RSS_FEED : AuthorView.NORMAL);
 		// TODO make author clickable more often #624
-		if (item.getHeader().getType() == POST) {
+		if (!fullText && item.getHeader().getType() == POST) {
-			author.setBlogLink(post.getGroupId());
+			author.setAuthorClickable(new OnClickListener() {
+				@Override
+				public void onClick(View v) {
+					listener.onAuthorClick(item);
+				}
+			});
 		} else {
-			author.unsetBlogLink();
+			author.setAuthorNotClickable();
 		}
 
 		// post body
 		Spanned bodyText = getSpanned(item.getBody());
-		if (listener == null) {
+		if (fullText) {
 			body.setText(bodyText);
 			body.setTextIsSelectable(true);
 			makeLinksClickable(body);
@@ -165,7 +171,14 @@ class BlogPostViewHolder extends RecyclerView.ViewHolder {
 		reblogger.setAuthor(item.getAuthor());
 		reblogger.setAuthorStatus(item.getAuthorStatus());
 		reblogger.setDate(item.getTimestamp());
-		reblogger.setBlogLink(item.getGroupId());
+		if (!fullText) {
+			reblogger.setAuthorClickable(new OnClickListener() {
+				@Override
+				public void onClick(View v) {
+					listener.onAuthorClick(item);
+				}
+			});
+		}
 		reblogger.setVisibility(VISIBLE);
 		reblogger.setPersona(AuthorView.REBLOGGER);
 
@@ -188,7 +201,7 @@ class BlogPostViewHolder extends RecyclerView.ViewHolder {
 			// TODO make author clickable #624
 
 			body.setText(c.getComment());
-			if (listener == null) body.setTextIsSelectable(true);
+			if (fullText) body.setTextIsSelectable(true);
 
 			commentContainer.addView(v);
 		}

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

@@ -19,7 +19,6 @@ import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
-import org.briarproject.briar.android.blog.BlogPostAdapter.OnBlogPostClickListener;
 import org.briarproject.briar.android.blog.FeedController.FeedListener;
 import org.briarproject.briar.android.controller.handler.UiResultExceptionHandler;
 import org.briarproject.briar.android.fragment.BaseFragment;
@@ -34,6 +33,7 @@ import javax.annotation.Nullable;
 import javax.inject.Inject;
 
 import static android.app.Activity.RESULT_OK;
+import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 import static android.support.design.widget.Snackbar.LENGTH_LONG;
 import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_WRITE_BLOG_POST;
@@ -223,6 +223,14 @@ public class FeedFragment extends BaseFragment implements
 		showNextFragment(f);
 	}
 
+	@Override
+	public void onAuthorClick(BlogPostItem post) {
+		Intent i = new Intent(getContext(), BlogActivity.class);
+		i.putExtra(GROUP_ID, post.getGroupId().getBytes());
+		i.setFlags(FLAG_ACTIVITY_CLEAR_TOP);
+		getContext().startActivity(i);
+	}
+
 	@Override
 	public String getUniqueTag() {
 		return TAG;

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

@@ -0,0 +1,8 @@
+package org.briarproject.briar.android.blog;
+
+interface OnBlogPostClickListener {
+
+	void onBlogPostClick(BlogPostItem post);
+
+	void onAuthorClick(BlogPostItem post);
+}

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

@@ -18,8 +18,8 @@ public class ReblogActivity extends BriarActivity implements
 
 	@Override
 	public void onCreate(Bundle savedInstanceState) {
-		super.onCreate(savedInstanceState);
 		setSceneTransitionAnimation();
+		super.onCreate(savedInstanceState);
 
 		Intent intent = getIntent();
 		byte[] groupId = intent.getByteArrayExtra(GROUP_ID);

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

@@ -161,7 +161,18 @@ public class ReblogFragment extends BaseFragment implements TextInputListener {
 		private ViewHolder(View v) {
 			scrollView = (ScrollView) v.findViewById(R.id.scrollView);
 			progressBar = (ProgressBar) v.findViewById(R.id.progressBar);
-			post = new BlogPostViewHolder(v.findViewById(R.id.postLayout));
+			post = new BlogPostViewHolder(v.findViewById(R.id.postLayout),
+					true, new OnBlogPostClickListener() {
+						@Override
+						public void onBlogPostClick(BlogPostItem post) {
+							// do nothing
+						}
+
+						@Override
+						public void onAuthorClick(BlogPostItem post) {
+							// probably don't want to allow author clicks here
+						}
+					});
 			input = (TextInputView) v.findViewById(R.id.inputText);
 		}
 	}

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

@@ -5,6 +5,7 @@ import android.os.Bundle;
 import android.support.v7.app.AlertDialog;
 import android.text.Editable;
 import android.text.TextWatcher;
+import android.util.Patterns;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
@@ -20,9 +21,12 @@ import org.briarproject.briar.android.activity.BriarActivity;
 import org.briarproject.briar.api.feed.FeedManager;
 
 import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
 import java.util.concurrent.Executor;
 import java.util.logging.Logger;
 
+import javax.annotation.Nullable;
 import javax.inject.Inject;
 
 import static android.view.View.GONE;
@@ -98,10 +102,17 @@ public class RssFeedImportActivity extends BriarActivity {
 
 	private void enableOrDisableImportButton() {
 		String url = urlInput.getText().toString();
-		if (url.startsWith("http://") || url.startsWith("https://"))
+		importButton.setEnabled(validateAndNormaliseUrl(url) != null);
-			importButton.setEnabled(true);
+	}
-		else
+
-			importButton.setEnabled(false);
+	@Nullable
+	private String validateAndNormaliseUrl(String url) {
+		if (!Patterns.WEB_URL.matcher(url).matches()) return null;
+		try {
+			return new URL(url).toString();
+		} catch (MalformedURLException e) {
+			return null;
+		}
 	}
 
 	private void publish() {
@@ -109,7 +120,9 @@ public class RssFeedImportActivity extends BriarActivity {
 		importButton.setVisibility(GONE);
 		progressBar.setVisibility(VISIBLE);
 
-		importFeed(urlInput.getText().toString());
+		String url = validateAndNormaliseUrl(urlInput.getText().toString());
+		if (url == null) throw new AssertionError();
+		importFeed(url);
 	}
 
 	private void importFeed(final String url) {

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

@@ -1,6 +1,5 @@
 package org.briarproject.briar.android.contact;
 
-import android.support.annotation.Nullable;
 import android.support.annotation.UiThread;
 import android.support.v7.widget.RecyclerView;
 import android.view.View;
@@ -13,6 +12,8 @@ import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.contact.BaseContactListAdapter.OnContactClickListener;
 
+import javax.annotation.Nullable;
+
 import im.delight.android.identicons.IdenticonDrawable;
 
 @UiThread

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

@@ -178,8 +178,6 @@ public class ContactListFragment extends BaseFragment implements EventListener {
 	@Override
 	public void onStart() {
 		super.onStart();
-		notificationManager.blockAllContactNotifications();
-		notificationManager.clearAllContactNotifications();
 		eventBus.addListener(this);
 		loadContacts();
 		list.startPeriodicUpdate();
@@ -189,7 +187,6 @@ public class ContactListFragment extends BaseFragment implements EventListener {
 	public void onStop() {
 		super.onStop();
 		eventBus.removeListener(this);
-		notificationManager.unblockAllContactNotifications();
 		adapter.clear();
 		list.showProgressBar();
 		list.stopPeriodicUpdate();

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

@@ -186,8 +186,8 @@ public class ConversationActivity extends BriarActivity
 	@SuppressWarnings("ConstantConditions")
 	@Override
 	public void onCreate(@Nullable Bundle state) {
-		super.onCreate(state);
 		setSceneTransitionAnimation();
+		super.onCreate(state);
 
 		Intent i = getIntent();
 		int id = i.getIntExtra(CONTACT_ID, -1);

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

@@ -17,7 +17,7 @@ public class DbControllerImpl implements DbController {
 	private static final Logger LOG =
 			Logger.getLogger(DbControllerImpl.class.getName());
 
-	private final Executor dbExecutor;
+	protected final Executor dbExecutor;
 	private final LifecycleManager lifecycleManager;
 
 	@Inject

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

@@ -1,7 +1,5 @@
 package org.briarproject.briar.android.controller;
 
-import android.support.annotation.Nullable;
-
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.event.EventBus;
@@ -15,6 +13,7 @@ import java.util.Collection;
 import java.util.HashSet;
 import java.util.Set;
 
+import javax.annotation.Nullable;
 import javax.inject.Inject;
 
 @NotNullByDefault

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

@@ -2,6 +2,7 @@ package org.briarproject.briar.android.forum;
 
 import android.content.Intent;
 import android.os.Bundle;
+import android.support.design.widget.TextInputLayout;
 import android.text.Editable;
 import android.text.TextWatcher;
 import android.view.KeyEvent;
@@ -38,16 +39,15 @@ import static org.briarproject.briar.api.forum.ForumConstants.MAX_FORUM_NAME_LEN
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
-public class CreateForumActivity extends BriarActivity
+public class CreateForumActivity extends BriarActivity {
-		implements OnEditorActionListener, OnClickListener {
 
 	private static final Logger LOG =
 			Logger.getLogger(CreateForumActivity.class.getName());
 
+	private TextInputLayout nameEntryLayout;
 	private EditText nameEntry;
 	private Button createForumButton;
 	private ProgressBar progress;
-	private TextView feedback;
 
 	// Fields that are accessed from background threads must be volatile
 	@Inject
@@ -59,12 +59,10 @@ public class CreateForumActivity extends BriarActivity
 
 		setContentView(R.layout.activity_create_forum);
 
+		nameEntryLayout =
+				(TextInputLayout) findViewById(R.id.createForumNameLayout);
 		nameEntry = (EditText) findViewById(R.id.createForumNameEntry);
-		TextWatcher nameEntryWatcher = new TextWatcher() {
+		nameEntry.addTextChangedListener(new TextWatcher() {
-
-			@Override
-			public void afterTextChanged(Editable s) {
-			}
 
 			@Override
 			public void beforeTextChanged(CharSequence s, int start, int count,
@@ -72,21 +70,39 @@ public class CreateForumActivity extends BriarActivity
 			}
 
 			@Override
-			public void onTextChanged(CharSequence text, int start,
+			public void onTextChanged(CharSequence s, int start,
 					int lengthBefore, int lengthAfter) {
 				enableOrDisableCreateButton();
 			}
-		};
-		nameEntry.setOnEditorActionListener(this);
-		nameEntry.addTextChangedListener(nameEntryWatcher);
 
-		feedback = (TextView) findViewById(R.id.createForumFeedback);
+			@Override
+			public void afterTextChanged(Editable s) {
+			}
+		});
+		nameEntry.setOnEditorActionListener(new OnEditorActionListener() {
+			@Override
+			public boolean onEditorAction(TextView v, int actionId,
+					KeyEvent e) {
+				createForum();
+				return true;
+			}
+		});
 
 		createForumButton = (Button) findViewById(R.id.createForumButton);
-		createForumButton.setOnClickListener(this);
+		createForumButton.setOnClickListener(new OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				createForum();
+			}
+		});
 
 		progress = (ProgressBar) findViewById(R.id.createForumProgressBar);
+	}
 
+	@Override
+	public void onStart() {
+		super.onStart();
+		showSoftKeyboard(nameEntry);
 	}
 
 	@Override
@@ -95,37 +111,28 @@ public class CreateForumActivity extends BriarActivity
 	}
 
 	private void enableOrDisableCreateButton() {
-		if (progress == null) return; // Not created yet
+		if (createForumButton == null) return; // Not created yet
 		createForumButton.setEnabled(validateName());
 	}
 
-	@Override
-	public boolean onEditorAction(TextView textView, int actionId, KeyEvent e) {
-		hideSoftKeyboard(textView);
-		return true;
-	}
-
 	private boolean validateName() {
 		String name = nameEntry.getText().toString();
 		int length = StringUtils.toUtf8(name).length;
 		if (length > MAX_FORUM_NAME_LENGTH) {
-			feedback.setText(R.string.name_too_long);
+			nameEntryLayout.setError(getString(R.string.name_too_long));
 			return false;
 		}
-		feedback.setText("");
+		nameEntryLayout.setError(null);
 		return length > 0;
 	}
 
-	@Override
+	private void createForum() {
-	public void onClick(View view) {
-		if (view == createForumButton) {
-			hideSoftKeyboard(view);
 		if (!validateName()) return;
+		hideSoftKeyboard(nameEntry);
 		createForumButton.setVisibility(GONE);
 		progress.setVisibility(VISIBLE);
 		storeForum(nameEntry.getText().toString());
 	}
-	}
 
 	private void storeForum(final String name) {
 		runOnDbThread(new Runnable() {

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

@@ -17,6 +17,7 @@ import org.briarproject.briar.android.controller.handler.ResultExceptionHandler;
 import org.briarproject.briar.android.forum.ForumController.ForumListener;
 import org.briarproject.briar.android.threaded.ThreadListControllerImpl;
 import org.briarproject.briar.api.android.AndroidNotificationManager;
+import org.briarproject.briar.api.client.MessageTracker;
 import org.briarproject.briar.api.client.MessageTracker.GroupCount;
 import org.briarproject.briar.api.forum.Forum;
 import org.briarproject.briar.api.forum.ForumInvitationResponse;
@@ -55,10 +56,10 @@ class ForumControllerImpl extends
 			LifecycleManager lifecycleManager, IdentityManager identityManager,
 			@CryptoExecutor Executor cryptoExecutor,
 			ForumManager forumManager, ForumSharingManager forumSharingManager,
-			EventBus eventBus, Clock clock,
+			EventBus eventBus, Clock clock, MessageTracker messageTracker,
 			AndroidNotificationManager notificationManager) {
 		super(dbExecutor, lifecycleManager, identityManager, cryptoExecutor,
-				eventBus, clock, notificationManager);
+				eventBus, clock, notificationManager, messageTracker);
 		this.forumManager = forumManager;
 		this.forumSharingManager = forumSharingManager;
 	}
@@ -84,7 +85,7 @@ class ForumControllerImpl extends
 					(ForumInvitationResponseReceivedEvent) e;
 			ForumInvitationResponse r =
 					(ForumInvitationResponse) f.getResponse();
-			if (r.getGroupId().equals(getGroupId()) && r.wasAccepted()) {
+			if (r.getShareableId().equals(getGroupId()) && r.wasAccepted()) {
 				LOG.info("Forum invitation was accepted");
 				onForumInvitationAccepted(r.getContactId());
 			}

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

@@ -119,8 +119,6 @@ public class ForumListFragment extends BaseEventFragment implements
 	@Override
 	public void onStart() {
 		super.onStart();
-		notificationManager.blockAllForumPostNotifications();
-		notificationManager.clearAllForumPostNotifications();
 		loadForums();
 		loadAvailableForums();
 		list.startPeriodicUpdate();
@@ -129,7 +127,6 @@ public class ForumListFragment extends BaseEventFragment implements
 	@Override
 	public void onStop() {
 		super.onStop();
-		notificationManager.unblockAllForumPostNotifications();
 		adapter.clear();
 		list.showProgressBar();
 		list.stopPeriodicUpdate();

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

@@ -1,66 +0,0 @@
-package org.briarproject.briar.android.fragment;
-
-import android.app.Dialog;
-import android.content.DialogInterface;
-import android.os.Bundle;
-import android.support.annotation.Nullable;
-import android.support.v4.app.DialogFragment;
-import android.support.v7.app.AlertDialog;
-import android.text.TextUtils;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.widget.CheckBox;
-import android.widget.TextView;
-
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
-import org.briarproject.briar.R;
-import org.briarproject.briar.android.activity.BaseActivity;
-
-import java.util.ArrayList;
-
-@MethodsNotNullByDefault
-@ParametersNotNullByDefault
-public class SFDialogFragment extends DialogFragment {
-
-	public static SFDialogFragment newInstance(ArrayList<String> apps) {
-		SFDialogFragment frag = new SFDialogFragment();
-		Bundle args = new Bundle();
-		args.putStringArrayList("apps", apps);
-		frag.setArguments(args);
-		return frag;
-	}
-
-	@Override
-	public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
-		AlertDialog.Builder builder =
-				new AlertDialog.Builder(
-						getActivity(),
-						R.style.BriarDialogThemeNoFilter);
-		builder.setTitle(R.string.screen_filter_title);
-		LayoutInflater li = getActivity().getLayoutInflater();
-		//Pass null here because it's an AlertDialog
-		View v =
-				li.inflate(R.layout.alert_dialog_checkbox, null,
-						false);
-		TextView t = (TextView) v.findViewById(R.id.alert_dialog_text);
-		final ArrayList<String> apps =
-				getArguments().getStringArrayList("apps");
-		t.setText(getString(R.string.screen_filter_body, TextUtils
-				.join("\n", apps)));
-		final CheckBox cb =
-				(CheckBox) v.findViewById(
-						R.id.checkBox_screen_filter_reminder);
-		builder.setNeutralButton(R.string.continue_button,
-				new DialogInterface.OnClickListener() {
-					@Override
-					public void onClick(DialogInterface dialog,
-							int which) {
-						((BaseActivity) getActivity())
-								.rememberShownApps(apps, cb.isChecked());
-					}
-				});
-		builder.setView(v);
-		return builder.create();
-	}
-}

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

@@ -0,0 +1,46 @@
+package org.briarproject.briar.android.fragment;
+
+import android.app.Dialog;
+import android.content.DialogInterface;
+import android.os.Bundle;
+import android.support.v4.app.DialogFragment;
+import android.support.v7.app.AlertDialog;
+import android.text.TextUtils;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.briar.R;
+
+import java.util.ArrayList;
+
+import javax.annotation.Nullable;
+
+@NotNullByDefault
+public class ScreenFilterDialogFragment extends DialogFragment {
+
+	public static ScreenFilterDialogFragment newInstance(
+			ArrayList<String> apps) {
+		ScreenFilterDialogFragment frag = new ScreenFilterDialogFragment();
+		Bundle args = new Bundle();
+		args.putStringArrayList("apps", apps);
+		frag.setArguments(args);
+		return frag;
+	}
+
+	@Override
+	public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
+		AlertDialog.Builder builder = new AlertDialog.Builder(getActivity(),
+				R.style.BriarDialogThemeNoFilter);
+		builder.setTitle(R.string.screen_filter_title);
+		ArrayList<String> apps = getArguments().getStringArrayList("apps");
+		builder.setMessage(getString(R.string.screen_filter_body,
+				TextUtils.join("\n", apps)));
+		builder.setNeutralButton(R.string.continue_button,
+				new DialogInterface.OnClickListener() {
+					@Override
+					public void onClick(DialogInterface dialog, int which) {
+						dialog.dismiss();
+					}
+				});
+		return builder.create();
+	}
+}

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

@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.fragment;
 
 import android.os.Bundle;
-import android.support.annotation.Nullable;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -9,6 +8,8 @@ import android.view.ViewGroup;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 
+import javax.annotation.Nullable;
+
 public class SignOutFragment extends BaseFragment {
 
 	private static final String TAG = SignOutFragment.class.getName();

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

@@ -33,7 +33,6 @@ import im.delight.android.identicons.IdenticonDrawable;
 
 import static android.app.Activity.RESULT_OK;
 import static android.view.View.GONE;
-import static android.view.View.VISIBLE;
 import static android.widget.Toast.LENGTH_SHORT;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.briar.api.introduction.IntroductionConstants.MAX_INTRODUCTION_MESSAGE_LENGTH;
@@ -94,7 +93,6 @@ public class IntroductionMessageFragment extends BaseFragment
 		View v = inflater.inflate(R.layout.introduction_message, container,
 				false);
 		ui = new ViewHolder(v);
-		ui.text.setVisibility(GONE);
 		ui.message.setSendButtonEnabled(false);
 
 		return v;
@@ -156,17 +154,11 @@ public class IntroductionMessageFragment extends BaseFragment
 				ui.contactName1.setText(c1.getAuthor().getName());
 				ui.contactName2.setText(c2.getAuthor().getName());
 
-				// set introduction text
-				ui.text.setText(String.format(
-						getString(R.string.introduction_message_text),
-						c1.getAuthor().getName(), c2.getAuthor().getName()));
-
 				// set button action
 				ui.message.setListener(IntroductionMessageFragment.this);
 
 				// hide progress bar and show views
 				ui.progressBar.setVisibility(GONE);
-				ui.text.setVisibility(VISIBLE);
 				ui.message.setSendButtonEnabled(true);
 				ui.message.showSoftKeyboard();
 			}
@@ -234,7 +226,6 @@ public class IntroductionMessageFragment extends BaseFragment
 		private final ProgressBar progressBar;
 		private final CircleImageView avatar1, avatar2;
 		private final TextView contactName1, contactName2;
-		private final TextView text;
 		private final TextInputView message;
 
 		private ViewHolder(View v) {
@@ -243,7 +234,6 @@ public class IntroductionMessageFragment extends BaseFragment
 			avatar2 = (CircleImageView) v.findViewById(R.id.avatarContact2);
 			contactName1 = (TextView) v.findViewById(R.id.nameContact1);
 			contactName2 = (TextView) v.findViewById(R.id.nameContact2);
-			text = (TextView) v.findViewById(R.id.introductionText);
 			message = (TextInputView) v
 					.findViewById(R.id.introductionMessageView);
 		}

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

@@ -7,6 +7,7 @@ import android.hardware.Camera.CameraInfo;
 import android.hardware.Camera.Parameters;
 import android.hardware.Camera.Size;
 import android.os.Build;
+import android.support.annotation.Nullable;
 import android.support.annotation.UiThread;
 import android.util.AttributeSet;
 import android.view.Surface;
@@ -43,6 +44,7 @@ public class CameraView extends SurfaceView implements SurfaceHolder.Callback,
 	private static final Logger LOG =
 			Logger.getLogger(CameraView.class.getName());
 
+	@Nullable
 	private Camera camera = null;
 	private PreviewConsumer previewConsumer = null;
 	private Surface surface = null;
@@ -86,6 +88,8 @@ public class CameraView extends SurfaceView implements SurfaceHolder.Callback,
 		try {
 			LOG.info("Opening camera");
 			camera = Camera.open();
+			if (camera == null)
+				throw new RuntimeException("No back-facing camera.");
 		} catch (RuntimeException e) {
 			LOG.log(WARNING, "Error opening camera", e);
 			return;
@@ -129,6 +133,7 @@ public class CameraView extends SurfaceView implements SurfaceHolder.Callback,
 	private void startPreview(SurfaceHolder holder) {
 		LOG.info("Starting preview");
 		try {
+			if (camera == null) throw new IOException("Camera is null.");
 			camera.setPreviewDisplay(holder);
 			camera.startPreview();
 			previewStarted = true;
@@ -142,6 +147,7 @@ public class CameraView extends SurfaceView implements SurfaceHolder.Callback,
 	private void stopPreview() {
 		LOG.info("Stopping preview");
 		try {
+			if (camera == null) throw new RuntimeException("Camera is null.");
 			stopConsumer();
 			camera.stopPreview();
 		} catch (RuntimeException e) {
@@ -152,12 +158,14 @@ public class CameraView extends SurfaceView implements SurfaceHolder.Callback,
 
 	@UiThread
 	private void startConsumer() {
+		if (camera == null) throw new RuntimeException("Camera is null");
 		if (autoFocus) camera.autoFocus(this);
 		previewConsumer.start(camera);
 	}
 
 	@UiThread
 	private void stopConsumer() {
+		if (camera == null) throw new RuntimeException("Camera is null");
 		if (autoFocus) camera.cancelAutoFocus();
 		previewConsumer.stop();
 	}
@@ -176,6 +184,7 @@ public class CameraView extends SurfaceView implements SurfaceHolder.Callback,
 		if (LOG.isLoggable(INFO))
 			LOG.info("Display orientation " + orientation + " degrees");
 		try {
+			if (camera == null) throw new RuntimeException("Camera is null");
 			camera.setDisplayOrientation(orientation);
 		} catch (RuntimeException e) {
 			LOG.log(WARNING, "Error setting display orientation", e);
@@ -216,7 +225,11 @@ public class CameraView extends SurfaceView implements SurfaceHolder.Callback,
 		setFocusMode(params);
 		params.setFlashMode(FLASH_MODE_OFF);
 		setPreviewSize(params);
+		try {
 			camera.setParameters(params);
+		} catch (RuntimeException e) {
+			LOG.log(WARNING, "Error setting best camera parameters", e);
+		}
 		return camera.getParameters();
 	}
 
@@ -287,7 +300,7 @@ public class CameraView extends SurfaceView implements SurfaceHolder.Callback,
 
 	@UiThread
 	private void logCameraParameters() {
-		if (LOG.isLoggable(INFO)) {
+		if (camera != null && LOG.isLoggable(INFO)) {
 			Parameters params = camera.getParameters();
 			if (Build.VERSION.SDK_INT >= 15) {
 				LOG.info("Video stabilisation enabled: "

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

@@ -29,6 +29,7 @@ import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BriarActivity;
 import org.briarproject.briar.android.blog.FeedFragment;
 import org.briarproject.briar.android.contact.ContactListFragment;
+import org.briarproject.briar.android.controller.handler.UiResultHandler;
 import org.briarproject.briar.android.forum.ForumListFragment;
 import org.briarproject.briar.android.fragment.BaseFragment;
 import org.briarproject.briar.android.fragment.BaseFragment.BaseFragmentListener;
@@ -45,6 +46,9 @@ import javax.inject.Inject;
 import static android.support.v4.app.FragmentManager.POP_BACK_STACK_INCLUSIVE;
 import static android.support.v4.view.GravityCompat.START;
 import static android.support.v4.widget.DrawerLayout.LOCK_MODE_LOCKED_CLOSED;
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
+import static org.briarproject.briar.android.util.UiUtils.getDaysUntilExpiry;
 
 public class NavDrawerActivity extends BriarActivity implements
 		BaseFragmentListener, TransportStateListener,
@@ -128,6 +132,12 @@ public class NavDrawerActivity extends BriarActivity implements
 	public void onStart() {
 		super.onStart();
 		updateTransports();
+		controller.showExpiryWarning(new UiResultHandler<Boolean>(this) {
+			@Override
+			public void onResultUi(Boolean showWarning) {
+				if (showWarning) showExpiryWarning();
+			}
+		});
 	}
 
 	private void exitIfStartupFailed(Intent intent) {
@@ -254,6 +264,34 @@ public class NavDrawerActivity extends BriarActivity implements
 		// Do nothing for now
 	}
 
+	@SuppressWarnings("ConstantConditions")
+	private void showExpiryWarning() {
+		int daysUntilExpiry = getDaysUntilExpiry();
+		if (daysUntilExpiry < 0) signOut();
+
+		// show expiry warning text
+		final ViewGroup
+				expiryWarning = (ViewGroup) findViewById(R.id.expiryWarning);
+		TextView expiryWarningText =
+				(TextView) expiryWarning.findViewById(R.id.expiryWarningText);
+		expiryWarningText.setText(getResources()
+				.getQuantityString(R.plurals.expiry_warning, daysUntilExpiry,
+						daysUntilExpiry));
+
+		// make close button functional
+		ImageView expiryWarningClose =
+				(ImageView) expiryWarning.findViewById(R.id.expiryWarningClose);
+		expiryWarningClose.setOnClickListener(new View.OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				controller.expiryWarningDismissed();
+				expiryWarning.setVisibility(GONE);
+			}
+		});
+
+		expiryWarning.setVisibility(VISIBLE);
+	}
+
 	private void initializeTransports(final LayoutInflater inflater) {
 		transports = new ArrayList<>(3);
 

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

@@ -3,10 +3,15 @@ package org.briarproject.briar.android.navdrawer;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.briar.android.controller.ActivityLifecycleController;
+import org.briarproject.briar.android.controller.handler.ResultHandler;
 
 @NotNullByDefault
 public interface NavDrawerController extends ActivityLifecycleController {
 
 	boolean isTransportRunning(TransportId transportId);
 
+	void showExpiryWarning(final ResultHandler<Boolean> handler);
+
+	void expiryWarningDismissed();
+
 }

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

@@ -3,6 +3,7 @@ package org.briarproject.briar.android.navdrawer;
 import android.app.Activity;
 
 import org.briarproject.bramble.api.db.DatabaseExecutor;
+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;
@@ -14,7 +15,10 @@ import org.briarproject.bramble.api.plugin.PluginManager;
 import org.briarproject.bramble.api.plugin.TransportId;
 import org.briarproject.bramble.api.plugin.event.TransportDisabledEvent;
 import org.briarproject.bramble.api.plugin.event.TransportEnabledEvent;
+import org.briarproject.bramble.api.settings.Settings;
+import org.briarproject.bramble.api.settings.SettingsManager;
 import org.briarproject.briar.android.controller.DbControllerImpl;
+import org.briarproject.briar.android.controller.handler.ResultHandler;
 
 import java.util.concurrent.Executor;
 import java.util.logging.Logger;
@@ -22,6 +26,9 @@ 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.briar.android.BriarApplication.EXPIRY_DATE;
+import static org.briarproject.briar.android.settings.SettingsFragment.SETTINGS_NAMESPACE;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -30,18 +37,21 @@ public class NavDrawerControllerImpl extends DbControllerImpl
 
 	private static final Logger LOG =
 			Logger.getLogger(NavDrawerControllerImpl.class.getName());
+	private static final String EXPIRY_DATE_WARNING = "expiryDateWarning";
 
 	private final PluginManager pluginManager;
+	private final SettingsManager settingsManager;
 	private final EventBus eventBus;
 
 	private volatile TransportStateListener listener;
 
 	@Inject
 	NavDrawerControllerImpl(@DatabaseExecutor Executor dbExecutor,
-			LifecycleManager lifecycleManager,
+			LifecycleManager lifecycleManager, PluginManager pluginManager,
-			PluginManager pluginManager, EventBus eventBus) {
+			SettingsManager settingsManager, EventBus eventBus) {
 		super(dbExecutor, lifecycleManager);
 		this.pluginManager = pluginManager;
+		this.settingsManager = settingsManager;
 		this.eventBus = eventBus;
 	}
 
@@ -92,6 +102,63 @@ public class NavDrawerControllerImpl extends DbControllerImpl
 		});
 	}
 
+	@Override
+	public void showExpiryWarning(final ResultHandler<Boolean> handler) {
+		runOnDbThread(new Runnable() {
+			@Override
+			public void run() {
+				try {
+					Settings settings =
+							settingsManager.getSettings(SETTINGS_NAMESPACE);
+					int warningInt = settings.getInt(EXPIRY_DATE_WARNING, 0);
+
+					if (warningInt == 0) {
+						// we have not warned before
+						handler.onResult(true);
+					} else {
+						long warningLong = warningInt * 1000L;
+						long now = System.currentTimeMillis();
+						long daysSinceLastWarning =
+								(now - warningLong) / 1000 / 60 / 60 / 24;
+						long daysBeforeExpiry =
+								(EXPIRY_DATE - now) / 1000 / 60 / 60 / 24;
+
+						if (daysSinceLastWarning >= 30) {
+							handler.onResult(true);
+							return;
+						}
+						if (daysBeforeExpiry <= 3 && daysSinceLastWarning > 0) {
+							handler.onResult(true);
+							return;
+						}
+						handler.onResult(false);
+					}
+				} catch (DbException e) {
+					if (LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				}
+			}
+		});
+	}
+
+	@Override
+	public void expiryWarningDismissed() {
+		runOnDbThread(new Runnable() {
+			@Override
+			public void run() {
+				try {
+					Settings settings = new Settings();
+					int date = (int) (System.currentTimeMillis() / 1000L);
+					settings.putInt(EXPIRY_DATE_WARNING, date);
+					settingsManager.mergeSettings(settings, SETTINGS_NAMESPACE);
+				} catch (DbException e) {
+					if (LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				}
+			}
+		});
+	}
+
 	@Override
 	public boolean isTransportRunning(TransportId transportId) {
 		Plugin plugin = pluginManager.getPlugin(transportId);

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

@@ -17,6 +17,7 @@ import org.briarproject.briar.android.controller.handler.ResultExceptionHandler;
 import org.briarproject.briar.android.privategroup.conversation.GroupController.GroupListener;
 import org.briarproject.briar.android.threaded.ThreadListControllerImpl;
 import org.briarproject.briar.api.android.AndroidNotificationManager;
+import org.briarproject.briar.api.client.MessageTracker;
 import org.briarproject.briar.api.client.MessageTracker.GroupCount;
 import org.briarproject.briar.api.privategroup.GroupMember;
 import org.briarproject.briar.api.privategroup.GroupMessage;
@@ -60,9 +61,10 @@ class GroupControllerImpl extends
 			@CryptoExecutor Executor cryptoExecutor,
 			PrivateGroupManager privateGroupManager,
 			GroupMessageFactory groupMessageFactory, EventBus eventBus,
-			Clock clock, AndroidNotificationManager notificationManager) {
+			MessageTracker messageTracker, Clock clock,
+			AndroidNotificationManager notificationManager) {
 		super(dbExecutor, lifecycleManager, identityManager, cryptoExecutor,
-				eventBus, clock, notificationManager);
+				eventBus, clock, notificationManager, messageTracker);
 		this.privateGroupManager = privateGroupManager;
 		this.groupMessageFactory = groupMessageFactory;
 	}
@@ -106,7 +108,7 @@ class GroupControllerImpl extends
 					(GroupInvitationResponseReceivedEvent) e;
 			final GroupInvitationResponse r =
 					(GroupInvitationResponse) g.getResponse();
-			if (getGroupId().equals(r.getGroupId()) && r.wasAccepted()) {
+			if (getGroupId().equals(r.getShareableId()) && r.wasAccepted()) {
 				listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 					@Override
 					public void run() {

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

@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.privategroup.conversation;
 
 import android.support.annotation.LayoutRes;
-import android.support.annotation.Nullable;
 import android.support.annotation.UiThread;
 
 import org.briarproject.bramble.api.identity.Author;
@@ -12,6 +11,7 @@ import org.briarproject.briar.R;
 import org.briarproject.briar.android.threaded.ThreadItem;
 import org.briarproject.briar.api.privategroup.GroupMessageHeader;
 
+import javax.annotation.Nullable;
 import javax.annotation.concurrent.NotThreadSafe;
 
 @UiThread

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

@@ -1,25 +1,15 @@
 package org.briarproject.briar.android.privategroup.conversation;
 
 import android.content.Context;
-import android.content.Intent;
 import android.support.annotation.UiThread;
 import android.view.View;
-import android.widget.Button;
-import android.widget.ImageView;
-import android.widget.TextView;
 
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
-import org.briarproject.briar.android.privategroup.reveal.RevealContactsActivity;
 import org.briarproject.briar.android.threaded.BaseThreadItemViewHolder;
 import org.briarproject.briar.android.threaded.ThreadItemAdapter.ThreadItemListener;
 
 import static org.briarproject.bramble.api.identity.Author.Status.OURSELVES;
-import static org.briarproject.bramble.api.identity.Author.Status.UNKNOWN;
-import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
-import static org.briarproject.briar.android.privategroup.VisibilityHelper.getVisibilityIcon;
-import static org.briarproject.briar.android.privategroup.VisibilityHelper.getVisibilityString;
-import static org.briarproject.briar.api.privategroup.Visibility.INVISIBLE;
 
 @UiThread
 @NotNullByDefault
@@ -27,16 +17,10 @@ class JoinMessageItemViewHolder
 		extends BaseThreadItemViewHolder<GroupMessageItem> {
 
 	private final boolean isCreator;
-	private final ImageView icon;
-	private final TextView info;
-	private final Button options;
 
 	JoinMessageItemViewHolder(View v, boolean isCreator) {
 		super(v);
 		this.isCreator = isCreator;
-		icon = (ImageView) v.findViewById(R.id.icon);
-		info = (TextView) v.findViewById(R.id.info);
-		options = (Button) v.findViewById(R.id.optionsButton);
 	}
 
 	@Override
@@ -56,9 +40,6 @@ class JoinMessageItemViewHolder
 					getContext().getString(R.string.groups_member_joined,
 							item.getAuthor().getName()));
 		}
-		icon.setVisibility(View.GONE);
-		info.setVisibility(View.GONE);
-		options.setVisibility(View.GONE);
 	}
 
 	private void bind(final JoinMessageItem item) {
@@ -75,32 +56,6 @@ class JoinMessageItemViewHolder
 						item.getAuthor().getName()));
 			}
 		}
-
-		if (item.getStatus() == OURSELVES || item.getStatus() == UNKNOWN) {
-			icon.setVisibility(View.GONE);
-			info.setVisibility(View.GONE);
-			options.setVisibility(View.GONE);
-		} else {
-			icon.setVisibility(View.VISIBLE);
-			icon.setImageResource(getVisibilityIcon(item.getVisibility()));
-			info.setVisibility(View.VISIBLE);
-			info.setText(getVisibilityString(getContext(), item.getVisibility(),
-					item.getAuthor().getName()));
-			if (item.getVisibility() == INVISIBLE) {
-				options.setVisibility(View.VISIBLE);
-				options.setOnClickListener(new View.OnClickListener() {
-					@Override
-					public void onClick(View v) {
-						Intent i =
-								new Intent(ctx, RevealContactsActivity.class);
-						i.putExtra(GROUP_ID, item.getGroupId().getBytes());
-						ctx.startActivity(i);
-					}
-				});
-			} else {
-				options.setVisibility(View.GONE);
-			}
-		}
 	}
 
 }

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

@@ -1,58 +0,0 @@
-package org.briarproject.briar.android.privategroup.creation;
-
-import org.briarproject.bramble.api.contact.ContactId;
-import org.briarproject.bramble.api.db.DbException;
-import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
-import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
-import org.briarproject.briar.android.contactselection.ContactSelectorActivity;
-import org.briarproject.briar.android.controller.handler.UiResultExceptionHandler;
-import org.briarproject.briar.android.sharing.BaseMessageFragment.MessageFragmentListener;
-
-import java.util.Collection;
-
-import javax.inject.Inject;
-
-import static org.briarproject.briar.api.privategroup.PrivateGroupConstants.MAX_GROUP_INVITATION_MSG_LENGTH;
-
-@MethodsNotNullByDefault
-@ParametersNotNullByDefault
-public abstract class BaseGroupInviteActivity
-		extends ContactSelectorActivity implements MessageFragmentListener {
-
-	@Inject
-	CreateGroupController controller;
-
-	@Override
-	public void contactsSelected(Collection<ContactId> contacts) {
-		super.contactsSelected(contacts);
-
-		showNextFragment(new CreateGroupMessageFragment());
-	}
-
-	@Override
-	public boolean onButtonClick(String message) {
-		if (groupId == null)
-			throw new IllegalStateException("GroupId was not initialized");
-		controller.sendInvitation(groupId, contacts, message,
-				new UiResultExceptionHandler<Void, DbException>(this) {
-					@Override
-					public void onResultUi(Void result) {
-						setResult(RESULT_OK);
-						supportFinishAfterTransition();
-					}
-
-					@Override
-					public void onExceptionUi(DbException exception) {
-						setResult(RESULT_CANCELED);
-						handleDbException(exception);
-					}
-				});
-		return true;
-	}
-
-	@Override
-	public int getMaximumMessageLength() {
-		return MAX_GROUP_INVITATION_MSG_LENGTH;
-	}
-
-}

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

@@ -2,7 +2,6 @@ package org.briarproject.briar.android.privategroup.creation;
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
 
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
@@ -10,14 +9,20 @@ import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
+import org.briarproject.briar.android.activity.BriarActivity;
 import org.briarproject.briar.android.controller.handler.UiResultExceptionHandler;
 import org.briarproject.briar.android.privategroup.conversation.GroupActivity;
-import org.briarproject.briar.android.sharing.BaseMessageFragment.MessageFragmentListener;
+
+import javax.annotation.Nullable;
+import javax.inject.Inject;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
-public class CreateGroupActivity extends BaseGroupInviteActivity implements
+public class CreateGroupActivity extends BriarActivity
-		CreateGroupListener, MessageFragmentListener {
+		implements CreateGroupListener {
+
+	@Inject
+	CreateGroupController controller;
 
 	@Override
 	public void injectActivity(ActivityComponent component) {
@@ -28,32 +33,20 @@ public class CreateGroupActivity extends BaseGroupInviteActivity implements
 	public void onCreate(@Nullable Bundle bundle) {
 		super.onCreate(bundle);
 
+		setContentView(R.layout.activity_fragment_container);
+
 		if (bundle == null) {
 			showInitialFragment(new CreateGroupFragment());
 		}
 	}
 
-	@Override
-	public void onBackPressed() {
-		if (getSupportFragmentManager().getBackStackEntryCount() == 1) {
-			// At this point, the group had been created already,
-			// so don't allow to create it again.
-			openNewGroup();
-			overridePendingTransition(R.anim.screen_old_in,
-					R.anim.screen_new_out);
-		} else {
-			super.onBackPressed();
-		}
-	}
-
 	@Override
 	public void onGroupNameChosen(String name) {
 		controller.createGroup(name,
 				new UiResultExceptionHandler<GroupId, DbException>(this) {
 					@Override
 					public void onResultUi(GroupId g) {
-						groupId = g;
+						openNewGroup(g);
-						switchToContactSelectorFragment(g);
 					}
 
 					@Override
@@ -63,16 +56,10 @@ public class CreateGroupActivity extends BaseGroupInviteActivity implements
 				});
 	}
 
-	private void switchToContactSelectorFragment(GroupId g) {
+	private void openNewGroup(GroupId g) {
-		showNextFragment(GroupInviteFragment.newInstance(g));
-	}
-
-	private void openNewGroup() {
 		Intent i = new Intent(this, GroupActivity.class);
-		i.putExtra(GROUP_ID, groupId.getBytes());
+		i.putExtra(GROUP_ID, g.getBytes());
 		startActivity(i);
-		// finish this activity, so we can't come back to it
 		finish();
 	}
-
 }

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

@@ -2,18 +2,27 @@ package org.briarproject.briar.android.privategroup.creation;
 
 import android.content.Context;
 import android.os.Bundle;
+import android.support.design.widget.TextInputLayout;
 import android.text.Editable;
 import android.text.TextWatcher;
+import android.view.KeyEvent;
 import android.view.LayoutInflater;
 import android.view.View;
+import android.view.View.OnClickListener;
 import android.view.ViewGroup;
 import android.widget.Button;
 import android.widget.EditText;
+import android.widget.ProgressBar;
+import android.widget.TextView;
+import android.widget.TextView.OnEditorActionListener;
 
+import org.briarproject.bramble.util.StringUtils;
 import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.fragment.BaseFragment;
 
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
 import static org.briarproject.briar.api.privategroup.PrivateGroupConstants.MAX_GROUP_NAME_LENGTH;
 
 public class CreateGroupFragment extends BaseFragment {
@@ -21,8 +30,10 @@ public class CreateGroupFragment extends BaseFragment {
 	public final static String TAG = CreateGroupFragment.class.getName();
 
 	private CreateGroupListener listener;
-	private EditText name;
+	private EditText nameEntry;
-	private Button button;
+	private Button createGroupButton;
+	private TextInputLayout nameLayout;
+	private ProgressBar progress;
 
 	@Override
 	public void onAttach(Context context) {
@@ -34,42 +45,54 @@ public class CreateGroupFragment extends BaseFragment {
 	public View onCreateView(LayoutInflater inflater, ViewGroup container,
 			Bundle savedInstanceState) {
 
-		// inflate view
 		View v = inflater.inflate(R.layout.fragment_create_group, container,
 				false);
-		name = (EditText) v.findViewById(R.id.name);
+		nameEntry = (EditText) v.findViewById(R.id.name);
-		name.addTextChangedListener(new TextWatcher() {
+		nameEntry.addTextChangedListener(new TextWatcher() {
+
 			@Override
 			public void beforeTextChanged(CharSequence s, int start, int count,
 					int after) {
 			}
 
 			@Override
-			public void onTextChanged(CharSequence s, int start, int before,
+			public void onTextChanged(CharSequence s, int start,
-					int count) {
+					int lengthBefore, int lengthAfter) {
-				validateName();
+				enableOrDisableCreateButton();
 			}
 
 			@Override
 			public void afterTextChanged(Editable s) {
 			}
 		});
-		button = (Button) v.findViewById(R.id.button);
+		nameEntry.setOnEditorActionListener(new OnEditorActionListener() {
-		button.setOnClickListener(new View.OnClickListener() {
 			@Override
-			public void onClick(View v) {
+			public boolean onEditorAction(TextView v, int actionId,
-				listener.hideSoftKeyboard(name);
+					KeyEvent e) {
-				listener.onGroupNameChosen(name.getText().toString());
+				createGroup();
+				return true;
 			}
 		});
 
+		nameLayout = (TextInputLayout) v.findViewById(R.id.nameLayout);
+
+		createGroupButton = (Button) v.findViewById(R.id.button);
+		createGroupButton.setOnClickListener(new OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				createGroup();
+			}
+		});
+
+		progress = (ProgressBar) v.findViewById(R.id.progressBar);
+
 		return v;
 	}
 
 	@Override
 	public void onStart() {
 		super.onStart();
-		listener.showSoftKeyboard(name);
+		listener.showSoftKeyboard(nameEntry);
 	}
 
 	@Override
@@ -82,12 +105,27 @@ public class CreateGroupFragment extends BaseFragment {
 		return TAG;
 	}
 
-	private void validateName() {
+	private void enableOrDisableCreateButton() {
-		String name = this.name.getText().toString();
+		if (createGroupButton == null) return; // Not created yet
-		if (name.length() < 1 || name.length() > MAX_GROUP_NAME_LENGTH)
+		createGroupButton.setEnabled(validateName());
-			button.setEnabled(false);
-		else if(!button.isEnabled())
-			button.setEnabled(true);
 	}
 
+	private boolean validateName() {
+		String name = nameEntry.getText().toString();
+		int length = StringUtils.toUtf8(name).length;
+		if (length > MAX_GROUP_NAME_LENGTH) {
+			nameLayout.setError(getString(R.string.name_too_long));
+			return false;
+		}
+		nameLayout.setError(null);
+		return length > 0;
+	}
+
+	private void createGroup() {
+		if (!validateName()) return;
+		listener.hideSoftKeyboard(nameEntry);
+		createGroupButton.setVisibility(GONE);
+		progress.setVisibility(VISIBLE);
+		listener.onGroupNameChosen(nameEntry.getText().toString());
+	}
 }

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

@@ -6,7 +6,7 @@ import dagger.Module;
 import dagger.Provides;
 
 @Module
-public class GroupCreateModule {
+public class CreateGroupModule {
 
 	@ActivityScope
 	@Provides

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

@@ -3,25 +3,43 @@ package org.briarproject.briar.android.privategroup.creation;
 import android.content.Intent;
 import android.os.Bundle;
 
+import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.briar.android.activity.ActivityComponent;
+import org.briarproject.briar.android.contactselection.ContactSelectorActivity;
+import org.briarproject.briar.android.controller.handler.UiResultExceptionHandler;
 import org.briarproject.briar.android.sharing.BaseMessageFragment.MessageFragmentListener;
 
-public class GroupInviteActivity extends BaseGroupInviteActivity
+import java.util.Collection;
+
+import javax.annotation.Nullable;
+import javax.inject.Inject;
+
+import static org.briarproject.briar.api.privategroup.PrivateGroupConstants.MAX_GROUP_INVITATION_MSG_LENGTH;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+public class GroupInviteActivity extends ContactSelectorActivity
 		implements MessageFragmentListener {
 
+	@Inject
+	CreateGroupController controller;
+
 	@Override
 	public void injectActivity(ActivityComponent component) {
 		component.inject(this);
 	}
 
 	@Override
-	public void onCreate(Bundle bundle) {
+	public void onCreate(@Nullable Bundle bundle) {
 		super.onCreate(bundle);
 
 		Intent i = getIntent();
 		byte[] g = i.getByteArrayExtra(GROUP_ID);
-		if (g == null) throw new IllegalStateException("No GroupId in intent.");
+		if (g == null) throw new IllegalStateException("No GroupId in intent");
 		groupId = new GroupId(g);
 
 		if (bundle == null) {
@@ -29,4 +47,36 @@ public class GroupInviteActivity extends BaseGroupInviteActivity
 		}
 	}
 
+	@Override
+	public void contactsSelected(Collection<ContactId> contacts) {
+		super.contactsSelected(contacts);
+
+		showNextFragment(new CreateGroupMessageFragment());
+	}
+
+	@Override
+	public boolean onButtonClick(String message) {
+		if (groupId == null)
+			throw new IllegalStateException("GroupId was not initialized");
+		controller.sendInvitation(groupId, contacts, message,
+				new UiResultExceptionHandler<Void, DbException>(this) {
+					@Override
+					public void onResultUi(Void result) {
+						setResult(RESULT_OK);
+						supportFinishAfterTransition();
+					}
+
+					@Override
+					public void onExceptionUi(DbException exception) {
+						setResult(RESULT_CANCELED);
+						handleDbException(exception);
+					}
+				});
+		return true;
+	}
+
+	@Override
+	public int getMaximumMessageLength() {
+		return MAX_GROUP_INVITATION_MSG_LENGTH;
+	}
 }

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

@@ -79,15 +79,12 @@ class GroupListControllerImpl extends DbControllerImpl
 			throw new IllegalStateException(
 					"GroupListListener needs to be attached");
 		eventBus.addListener(this);
-		notificationManager.blockAllGroupMessageNotifications();
-		notificationManager.clearAllGroupMessageNotifications();
 	}
 
 	@Override
 	@CallSuper
 	public void onStop() {
 		eventBus.removeListener(this);
-		notificationManager.unblockAllGroupMessageNotifications();
 	}
 
 	@Override

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

@@ -36,7 +36,6 @@ class MemberListAdapter extends
 	@Override
 	public boolean areContentsTheSame(MemberListItem m1, MemberListItem m2) {
 		if (m1.isOnline() != m2.isOnline()) return false;
-		if (m1.getVisibility() != m2.getVisibility()) return false;
 		if (m1.getContactId() != m2.getContactId()) return false;
 		if (m1.getStatus() != m2.getStatus()) return false;
 		return true;

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

@@ -1,14 +1,12 @@
 package org.briarproject.briar.android.privategroup.memberlist;
 
-import android.support.annotation.Nullable;
-
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.identity.Author;
 import org.briarproject.bramble.api.identity.Author.Status;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.api.privategroup.GroupMember;
-import org.briarproject.briar.api.privategroup.Visibility;
 
+import javax.annotation.Nullable;
 import javax.annotation.concurrent.NotThreadSafe;
 
 @NotThreadSafe
@@ -40,10 +38,6 @@ class MemberListItem {
 		return groupMember.getContactId();
 	}
 
-	Visibility getVisibility() {
-		return groupMember.getVisibility();
-	}
-
 	boolean isOnline() {
 		return online;
 	}

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

@@ -11,9 +11,6 @@ import org.briarproject.briar.R;
 import org.briarproject.briar.android.view.AuthorView;
 
 import static org.briarproject.bramble.api.identity.Author.Status.OURSELVES;
-import static org.briarproject.bramble.api.identity.Author.Status.UNKNOWN;
-import static org.briarproject.briar.android.privategroup.VisibilityHelper.getVisibilityIcon;
-import static org.briarproject.briar.android.privategroup.VisibilityHelper.getVisibilityString;
 
 @UiThread
 @NotNullByDefault
@@ -22,16 +19,12 @@ class MemberListItemHolder extends RecyclerView.ViewHolder {
 	private final AuthorView author;
 	private final ImageView bulb;
 	private final TextView creator;
-	private final ImageView icon;
-	private final TextView info;
 
 	MemberListItemHolder(View v) {
 		super(v);
 		author = (AuthorView) v.findViewById(R.id.authorView);
 		bulb = (ImageView) v.findViewById(R.id.bulbView);
 		creator = (TextView) v.findViewById(R.id.creatorView);
-		icon = (ImageView) v.findViewById(R.id.icon);
-		info = (TextView) v.findViewById(R.id.info);
 	}
 
 	protected void bind(MemberListItem item) {
@@ -64,19 +57,6 @@ class MemberListItemHolder extends RecyclerView.ViewHolder {
 		} else {
 			creator.setVisibility(View.GONE);
 		}
-
-		// visibility information
-		if (item.getStatus() == OURSELVES || item.getStatus() == UNKNOWN) {
-			icon.setVisibility(View.GONE);
-			info.setVisibility(View.GONE);
-		} else {
-			icon.setVisibility(View.VISIBLE);
-			icon.setImageResource(getVisibilityIcon(item.getVisibility()));
-			info.setVisibility(View.VISIBLE);
-			info.setText(
-					getVisibilityString(info.getContext(), item.getVisibility(),
-							item.getMember().getName()));
-		}
 	}
 
 }

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

@@ -146,7 +146,7 @@ public class BriarReportPrimer implements ReportPrimer {
 			NetworkInfo wifi = cm.getNetworkInfo(TYPE_WIFI);
 			boolean wifiAvailable = wifi != null && wifi.isAvailable();
 			// Is wifi enabled?
-			o = ctx.getSystemService(WIFI_SERVICE);
+			o = ctx.getApplicationContext().getSystemService(WIFI_SERVICE);
 			WifiManager wm = (WifiManager) o;
 			boolean wifiEnabled = wm != null &&
 					wm.getWifiState() == WIFI_STATE_ENABLED;

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

@@ -6,6 +6,7 @@ import android.content.Intent;
 import android.media.Ringtone;
 import android.media.RingtoneManager;
 import android.net.Uri;
+import android.os.Build;
 import android.os.Bundle;
 import android.support.v7.preference.CheckBoxPreference;
 import android.support.v7.preference.ListPreference;
@@ -54,6 +55,7 @@ import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_RINGT
 import static org.briarproject.briar.api.android.AndroidNotificationManager.PREF_NOTIFY_BLOG;
 import static org.briarproject.briar.api.android.AndroidNotificationManager.PREF_NOTIFY_FORUM;
 import static org.briarproject.briar.api.android.AndroidNotificationManager.PREF_NOTIFY_GROUP;
+import static org.briarproject.briar.api.android.AndroidNotificationManager.PREF_NOTIFY_LOCK_SCREEN;
 import static org.briarproject.briar.api.android.AndroidNotificationManager.PREF_NOTIFY_PRIVATE;
 import static org.briarproject.briar.api.android.AndroidNotificationManager.PREF_NOTIFY_RINGTONE_NAME;
 import static org.briarproject.briar.api.android.AndroidNotificationManager.PREF_NOTIFY_RINGTONE_URI;
@@ -81,6 +83,8 @@ public class SettingsFragment extends PreferenceFragmentCompat
 	private CheckBoxPreference notifyForumPosts;
 	private CheckBoxPreference notifyBlogPosts;
 	private CheckBoxPreference notifyVibration;
+	private CheckBoxPreference notifyLockscreen;
+
 	private Preference notifySound;
 
 	// Fields that are accessed from background threads must be volatile
@@ -114,6 +118,8 @@ public class SettingsFragment extends PreferenceFragmentCompat
 				"pref_key_notify_blog_posts");
 		notifyVibration = (CheckBoxPreference) findPreference(
 				"pref_key_notify_vibration");
+		notifyLockscreen = (CheckBoxPreference) findPreference(
+				"pref_key_notify_lock_screen");
 		notifySound = findPreference("pref_key_notify_sound");
 
 		enableBluetooth.setOnPreferenceChangeListener(this);
@@ -123,7 +129,10 @@ public class SettingsFragment extends PreferenceFragmentCompat
 		notifyForumPosts.setOnPreferenceChangeListener(this);
 		notifyBlogPosts.setOnPreferenceChangeListener(this);
 		notifyVibration.setOnPreferenceChangeListener(this);
-
+		if (Build.VERSION.SDK_INT >= 21) {
+			notifyLockscreen.setVisible(true);
+			notifyLockscreen.setOnPreferenceChangeListener(this);
+		}
 		notifySound.setOnPreferenceClickListener(
 				new Preference.OnPreferenceClickListener() {
 					@Override
@@ -234,6 +243,9 @@ public class SettingsFragment extends PreferenceFragmentCompat
 				notifyVibration.setChecked(settings.getBoolean(
 						PREF_NOTIFY_VIBRATION, true));
 
+				notifyLockscreen.setChecked(settings.getBoolean(
+						PREF_NOTIFY_LOCK_SCREEN, false));
+
 				String text;
 				if (settings.getBoolean(PREF_NOTIFY_SOUND, true)) {
 					String ringtoneName =
@@ -290,6 +302,10 @@ public class SettingsFragment extends PreferenceFragmentCompat
 			Settings s = new Settings();
 			s.putBoolean(PREF_NOTIFY_VIBRATION, (Boolean) o);
 			storeSettings(s);
+		} else if (preference == notifyLockscreen) {
+			Settings s = new Settings();
+			s.putBoolean(PREF_NOTIFY_LOCK_SCREEN, (Boolean) o);
+			storeSettings(s);
 		}
 		return true;
 	}

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

@@ -2,7 +2,6 @@ package org.briarproject.briar.android.sharing;
 
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.annotation.Nullable;
 import android.support.annotation.StringRes;
 import android.support.v7.widget.LinearLayoutManager;
 import android.view.MenuItem;
@@ -25,6 +24,7 @@ import java.util.Collection;
 import java.util.List;
 import java.util.logging.Logger;
 
+import javax.annotation.Nullable;
 import javax.inject.Inject;
 
 import static java.util.logging.Level.WARNING;

briar-android/src/main/java/org/briarproject/briar/android/splash/SplashScreenActivity.java

@@ -4,9 +4,6 @@ import android.content.Intent;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
-import android.os.StrictMode;
-import android.os.StrictMode.ThreadPolicy;
-import android.os.StrictMode.VmPolicy;
 import android.support.v7.preference.PreferenceManager;
 import android.transition.Fade;
 
@@ -22,27 +19,18 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
-import static org.briarproject.briar.android.TestingConstants.DEFAULT_LOG_LEVEL;
+import static org.briarproject.briar.android.BriarApplication.EXPIRY_DATE;
-import static org.briarproject.briar.android.TestingConstants.TESTING;
 
 public class SplashScreenActivity extends BaseActivity {
 
 	private static final Logger LOG =
 			Logger.getLogger(SplashScreenActivity.class.getName());
 
-	// This build expires on 1 May 2017
-	private static final long EXPIRY_DATE = 1493593200 * 1000L;
-
 	@Inject
 	protected ConfigController configController;
 	@Inject
 	protected AndroidExecutor androidExecutor;
 
-	public SplashScreenActivity() {
-		Logger.getLogger("").setLevel(DEFAULT_LOG_LEVEL);
-		enableStrictMode();
-	}
-
 	@Override
 	public void onCreate(Bundle state) {
 		super.onCreate(state);
@@ -83,23 +71,6 @@ public class SplashScreenActivity extends BaseActivity {
 		}
 	}
 
-	@Override
-	protected void showNewScreenFilterWarning() {
-	}
-
-	private void enableStrictMode() {
-		if (TESTING) {
-			ThreadPolicy.Builder threadPolicy = new ThreadPolicy.Builder();
-			threadPolicy.detectAll();
-			threadPolicy.penaltyLog();
-			StrictMode.setThreadPolicy(threadPolicy.build());
-			VmPolicy.Builder vmPolicy = new VmPolicy.Builder();
-			vmPolicy.detectAll();
-			vmPolicy.penaltyLog();
-			StrictMode.setVmPolicy(vmPolicy.build());
-		}
-	}
-
 	private void setPreferencesDefaults() {
 		androidExecutor.runOnBackgroundThread(new Runnable() {
 			@Override

briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadItemAdapter.java

@@ -1,6 +1,6 @@
 package org.briarproject.briar.android.threaded;
 
-import android.support.annotation.Nullable;
+import android.os.Handler;
 import android.support.annotation.UiThread;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
@@ -14,6 +14,8 @@ import org.briarproject.briar.android.util.VersionedAdapter;
 
 import java.util.Collection;
 
+import javax.annotation.Nullable;
+
 import static android.support.v7.widget.RecyclerView.NO_POSITION;
 
 @UiThread
@@ -26,6 +28,7 @@ public class ThreadItemAdapter<I extends ThreadItem>
 	protected final NestedTreeList<I> items = new NestedTreeList<>();
 	private final ThreadItemListener<I> listener;
 	private final LinearLayoutManager layoutManager;
+	private final Handler handler = new Handler();
 
 	private volatile int revision = 0;
 
@@ -64,6 +67,17 @@ public class ThreadItemAdapter<I extends ThreadItem>
 		revision++;
 	}
 
+	void setItemWithIdVisible(MessageId messageId) {
+		int pos = 0;
+		for (I item : items) {
+			if (item.getId().equals(messageId)) {
+				layoutManager.scrollToPosition(pos);
+				break;
+			}
+			pos++;
+		}
+	}
+
 	public void setItems(Collection<I> items) {
 		this.items.clear();
 		this.items.addAll(items);
@@ -144,7 +158,7 @@ public class ThreadItemAdapter<I extends ThreadItem>
 	/**
 	 * Returns the position of the first unread item below the current viewport
 	 */
-	public int getVisibleUnreadPosBottom() {
+	int getVisibleUnreadPosBottom() {
 		final int positionBottom = layoutManager.findLastVisibleItemPosition();
 		if (positionBottom == NO_POSITION) return NO_POSITION;
 		for (int i = positionBottom + 1; i < items.size(); i++) {
@@ -156,7 +170,7 @@ public class ThreadItemAdapter<I extends ThreadItem>
 	/**
 	 * Returns the position of the first unread item above the current viewport
 	 */
-	public int getVisibleUnreadPosTop() {
+	int getVisibleUnreadPosTop() {
 		final int positionTop = layoutManager.findFirstVisibleItemPosition();
 		int position = NO_POSITION;
 		for (int i = 0; i < items.size(); i++) {

briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadItemList.java

@@ -0,0 +1,15 @@
+package org.briarproject.briar.android.threaded;
+
+import org.briarproject.bramble.api.sync.MessageId;
+
+import java.util.List;
+
+import javax.annotation.Nullable;
+
+public interface ThreadItemList<I extends ThreadItem> extends List<I> {
+
+	@Nullable
+	MessageId getFirstVisibleItemId();
+
+	void setFirstVisibleId(@Nullable MessageId bottomVisibleItemId);
+}

briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadItemListImpl.java

@@ -0,0 +1,22 @@
+package org.briarproject.briar.android.threaded;
+
+import org.briarproject.bramble.api.sync.MessageId;
+
+import java.util.ArrayList;
+
+import javax.annotation.Nullable;
+
+public class ThreadItemListImpl<I extends ThreadItem> extends ArrayList<I>
+		implements ThreadItemList<I> {
+
+	private MessageId bottomVisibleItemId;
+
+	@Override
+	public MessageId getFirstVisibleItemId() {
+		return bottomVisibleItemId;
+	}
+
+	public void setFirstVisibleId(@Nullable MessageId bottomVisibleItemId) {
+		this.bottomVisibleItemId = bottomVisibleItemId;
+	}
+}

briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadListActivity.java

@@ -3,7 +3,6 @@ package org.briarproject.briar.android.threaded;
 import android.content.Intent;
 import android.os.Bundle;
 import android.support.annotation.CallSuper;
-import android.support.annotation.Nullable;
 import android.support.annotation.StringRes;
 import android.support.annotation.UiThread;
 import android.support.design.widget.Snackbar;
@@ -26,6 +25,7 @@ import org.briarproject.briar.android.controller.SharingController;
 import org.briarproject.briar.android.controller.SharingController.SharingListener;
 import org.briarproject.briar.android.controller.handler.UiResultExceptionHandler;
 import org.briarproject.briar.android.threaded.ThreadItemAdapter.ThreadItemListener;
+import org.briarproject.briar.android.threaded.ThreadListController.ThreadListDataSource;
 import org.briarproject.briar.android.threaded.ThreadListController.ThreadListListener;
 import org.briarproject.briar.android.view.BriarRecyclerView;
 import org.briarproject.briar.android.view.TextInputView;
@@ -38,6 +38,7 @@ import org.thoughtcrime.securesms.components.KeyboardAwareLinearLayout;
 import java.util.Collection;
 import java.util.logging.Logger;
 
+import javax.annotation.Nullable;
 import javax.inject.Inject;
 
 import static android.support.design.widget.Snackbar.make;
@@ -51,7 +52,7 @@ import static org.briarproject.briar.android.threaded.ThreadItemAdapter.UnreadCo
 public abstract class ThreadListActivity<G extends NamedGroup, A extends ThreadItemAdapter<I>, I extends ThreadItem, H extends PostHeader>
 		extends BriarActivity
 		implements ThreadListListener<H>, TextInputListener, SharingListener,
-		ThreadItemListener<I> {
+		ThreadItemListener<I>, ThreadListDataSource {
 
 	protected static final String KEY_REPLY_ID = "replyId";
 
@@ -68,6 +69,7 @@ public abstract class ThreadListActivity<G extends NamedGroup, A extends ThreadI
 	private MessageId replyId;
 
 	protected abstract ThreadListController<G, I, H> getController();
+
 	@Inject
 	protected SharingController sharingController;
 
@@ -104,6 +106,7 @@ public abstract class ThreadListActivity<G extends NamedGroup, A extends ThreadI
 							updateUnreadCount();
 						}
 					}
+
 					@Override
 					public void onScrollStateChanged(RecyclerView recyclerView,
 							int newState) {
@@ -139,11 +142,22 @@ public abstract class ThreadListActivity<G extends NamedGroup, A extends ThreadI
 			if (replyIdBytes != null) replyId = new MessageId(replyIdBytes);
 		}
 
-		loadItems();
 		sharingController.setSharingListener(this);
 		loadSharingContacts();
 	}
 
+	@Override
+	@Nullable
+	public MessageId getFirstVisibleMessageId() {
+		if (layoutManager != null && adapter != null) {
+			int position =
+					layoutManager.findFirstVisibleItemPosition();
+			I i = adapter.getItemAt(position);
+			return i == null ? null : i.getId();
+		}
+		return null;
+	}
+
 	protected abstract A createAdapter(LinearLayoutManager layoutManager);
 
 	protected void loadNamedGroup() {
@@ -167,16 +181,16 @@ public abstract class ThreadListActivity<G extends NamedGroup, A extends ThreadI
 	protected void loadItems() {
 		final int revision = adapter.getRevision();
 		getController().loadItems(
-				new UiResultExceptionHandler<Collection<I>, DbException>(this) {
+				new UiResultExceptionHandler<ThreadItemList<I>, DbException>(
+						this) {
 					@Override
-					public void onResultUi(Collection<I> items) {
+					public void onResultUi(ThreadItemList<I> items) {
 						if (revision == adapter.getRevision()) {
 							adapter.incrementRevision();
 							if (items.isEmpty()) {
 								list.showData();
 							} else {
-								adapter.setItems(items);
+								initList(items);
-								list.showData();
 								updateTextInput(replyId);
 							}
 						} else {
@@ -192,6 +206,15 @@ public abstract class ThreadListActivity<G extends NamedGroup, A extends ThreadI
 				});
 	}
 
+	private void initList(final ThreadItemList<I> items) {
+		adapter.setItems(items);
+		MessageId messageId = items.getFirstVisibleItemId();
+		if (messageId != null)
+			adapter.setItemWithIdVisible(messageId);
+		updateUnreadCount();
+		list.showData();
+	}
+
 	protected void loadSharingContacts() {
 		getController().loadSharingContacts(
 				new UiResultExceptionHandler<Collection<ContactId>, DbException>(
@@ -215,6 +238,7 @@ public abstract class ThreadListActivity<G extends NamedGroup, A extends ThreadI
 	public void onStart() {
 		super.onStart();
 		sharingController.onStart();
+		loadItems();
 		list.startPeriodicUpdate();
 	}
 

briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadListController.java

@@ -6,6 +6,7 @@ import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.sync.GroupId;
+import org.briarproject.bramble.api.sync.MessageId;
 import org.briarproject.briar.android.DestroyableContext;
 import org.briarproject.briar.android.controller.ActivityLifecycleController;
 import org.briarproject.briar.android.controller.handler.ExceptionHandler;
@@ -30,7 +31,7 @@ public interface ThreadListController<G extends NamedGroup, I extends ThreadItem
 
 	void loadItem(H header, ResultExceptionHandler<I, DbException> handler);
 
-	void loadItems(ResultExceptionHandler<Collection<I>, DbException> handler);
+	void loadItems(ResultExceptionHandler<ThreadItemList<I>, DbException> handler);
 
 	void markItemRead(I item);
 
@@ -41,7 +42,7 @@ public interface ThreadListController<G extends NamedGroup, I extends ThreadItem
 
 	void deleteNamedGroup(ExceptionHandler<DbException> handler);
 
-	interface ThreadListListener<H> extends DestroyableContext {
+	interface ThreadListListener<H> extends ThreadListDataSource {
 		@UiThread
 		void onHeaderReceived(H header);
 
@@ -52,4 +53,10 @@ public interface ThreadListController<G extends NamedGroup, I extends ThreadItem
 		void onInvitationAccepted(ContactId c);
 	}
 
+	interface ThreadListDataSource extends DestroyableContext {
+
+		@UiThread @Nullable
+		MessageId getFirstVisibleMessageId();
+	}
+
 }

briar-android/src/main/java/org/briarproject/briar/android/threaded/ThreadListControllerImpl.java

@@ -22,14 +22,13 @@ import org.briarproject.briar.android.controller.handler.ExceptionHandler;
 import org.briarproject.briar.android.controller.handler.ResultExceptionHandler;
 import org.briarproject.briar.android.threaded.ThreadListController.ThreadListListener;
 import org.briarproject.briar.api.android.AndroidNotificationManager;
+import org.briarproject.briar.api.client.MessageTracker;
 import org.briarproject.briar.api.client.NamedGroup;
 import org.briarproject.briar.api.client.PostHeader;
 import org.briarproject.briar.api.client.ThreadedMessage;
 
-import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
-import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.Executor;
@@ -55,18 +54,21 @@ public abstract class ThreadListControllerImpl<G extends NamedGroup, I extends T
 	protected final AndroidNotificationManager notificationManager;
 	protected final Executor cryptoExecutor;
 	protected final Clock clock;
+	private final MessageTracker messageTracker;
 	protected volatile L listener;
 
 	protected ThreadListControllerImpl(@DatabaseExecutor Executor dbExecutor,
 			LifecycleManager lifecycleManager, IdentityManager identityManager,
 			@CryptoExecutor Executor cryptoExecutor, EventBus eventBus,
-			Clock clock, AndroidNotificationManager notificationManager) {
+			Clock clock, AndroidNotificationManager notificationManager,
+			MessageTracker messageTracker) {
 		super(dbExecutor, lifecycleManager);
 		this.identityManager = identityManager;
 		this.cryptoExecutor = cryptoExecutor;
 		this.notificationManager = notificationManager;
 		this.clock = clock;
 		this.eventBus = eventBus;
+		this.messageTracker = messageTracker;
 	}
 
 	@Override
@@ -97,6 +99,21 @@ public abstract class ThreadListControllerImpl<G extends NamedGroup, I extends T
 
 	@Override
 	public void onActivityDestroy() {
+		final MessageId messageId = listener.getFirstVisibleMessageId();
+		if (messageId != null) {
+			dbExecutor.execute(new Runnable() {
+				@Override
+				public void run() {
+					try {
+						messageTracker
+								.storeMessageId(groupId, messageId);
+					} catch (DbException e) {
+						if (LOG.isLoggable(WARNING))
+							LOG.log(WARNING, e.toString(), e);
+					}
+				}
+			});
+		}
 	}
 
 	@CallSuper
@@ -144,7 +161,7 @@ public abstract class ThreadListControllerImpl<G extends NamedGroup, I extends T
 
 	@Override
 	public void loadItems(
-			final ResultExceptionHandler<Collection<I>, DbException> handler) {
+			final ResultExceptionHandler<ThreadItemList<I>, DbException> handler) {
 		checkGroupId();
 		runOnDbThread(new Runnable() {
 			@Override
@@ -293,11 +310,16 @@ public abstract class ThreadListControllerImpl<G extends NamedGroup, I extends T
 	@DatabaseExecutor
 	protected abstract void deleteNamedGroup(G groupItem) throws DbException;
 
-	private List<I> buildItems(Collection<H> headers) {
+	private ThreadItemList<I> buildItems(Collection<H> headers)
-		List<I> items = new ArrayList<>();
+			throws DbException {
+		ThreadItemList<I> items = new ThreadItemListImpl<>();
 		for (H h : headers) {
 			items.add(buildItem(h, bodyCache.get(h.getId())));
 		}
+		MessageId msgId = messageTracker.loadStoredMessageId(groupId);
+		if (LOG.isLoggable(INFO))
+			LOG.info("Loaded last top visible message id " + msgId);
+		items.setFirstVisibleId(msgId);
 		return items;
 	}
 

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

@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.util;
 
 import android.content.Context;
-import android.support.annotation.Nullable;
 import android.support.design.widget.TextInputLayout;
 import android.support.v4.app.FragmentManager;
 import android.support.v4.content.ContextCompat;
@@ -23,6 +22,8 @@ import org.briarproject.briar.R;
 import org.briarproject.briar.android.view.ArticleMovementMethod;
 import org.briarproject.briar.android.widget.LinkDialogFragment;
 
+import javax.annotation.Nullable;
+
 import static android.text.format.DateUtils.DAY_IN_MILLIS;
 import static android.text.format.DateUtils.FORMAT_ABBREV_MONTH;
 import static android.text.format.DateUtils.FORMAT_ABBREV_RELATIVE;
@@ -30,6 +31,7 @@ import static android.text.format.DateUtils.FORMAT_ABBREV_TIME;
 import static android.text.format.DateUtils.FORMAT_SHOW_DATE;
 import static android.text.format.DateUtils.MINUTE_IN_MILLIS;
 import static android.text.format.DateUtils.WEEK_IN_MILLIS;
+import static org.briarproject.briar.android.BriarApplication.EXPIRY_DATE;
 
 public class UiUtils {
 
@@ -63,6 +65,12 @@ public class UiUtils {
 				MIN_DATE_RESOLUTION, flags).toString();
 	}
 
+	public static int getDaysUntilExpiry() {
+		long now = System.currentTimeMillis();
+		long daysBeforeExpiry = (EXPIRY_DATE - now) / 1000 / 60 / 60 / 24;
+		return (int) daysBeforeExpiry;
+	}
+
 	public static SpannableStringBuilder getTeaser(Context ctx, Spanned body) {
 		if (body.length() < TEASER_LENGTH)
 			throw new IllegalArgumentException(

briar-android/src/main/java/org/briarproject/briar/android/view/AuthorView.java

@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.view;
 
 import android.content.Context;
-import android.content.Intent;
 import android.content.res.TypedArray;
 import android.graphics.Typeface;
 import android.support.annotation.DimenRes;
@@ -16,9 +15,7 @@ import android.widget.TextView;
 
 import org.briarproject.bramble.api.identity.Author;
 import org.briarproject.bramble.api.identity.Author.Status;
-import org.briarproject.bramble.api.sync.GroupId;
 import org.briarproject.briar.R;
-import org.briarproject.briar.android.blog.BlogActivity;
 import org.briarproject.briar.android.util.UiUtils;
 
 import javax.annotation.Nullable;
@@ -27,12 +24,10 @@ import de.hdodenhof.circleimageview.CircleImageView;
 import im.delight.android.identicons.IdenticonDrawable;
 
 import static android.content.Context.LAYOUT_INFLATER_SERVICE;
-import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 import static android.graphics.Typeface.BOLD;
 import static android.util.TypedValue.COMPLEX_UNIT_PX;
 import static org.briarproject.bramble.api.identity.Author.Status.NONE;
 import static org.briarproject.bramble.api.identity.Author.Status.OURSELVES;
-import static org.briarproject.briar.android.activity.BriarActivity.GROUP_ID;
 
 @UiThread
 public class AuthorView extends RelativeLayout {
@@ -110,24 +105,16 @@ public class AuthorView extends RelativeLayout {
 		requestLayout();
 	}
 
-	public void setBlogLink(final GroupId groupId) {
+	public void setAuthorClickable(OnClickListener listener) {
 		setClickable(true);
 		TypedValue outValue = new TypedValue();
 		getContext().getTheme().resolveAttribute(
 				android.R.attr.selectableItemBackground, outValue, true);
 		setBackgroundResource(outValue.resourceId);
-		setOnClickListener(new OnClickListener() {
+		setOnClickListener(listener);
-			@Override
-			public void onClick(View v) {
-				Intent i = new Intent(getContext(), BlogActivity.class);
-				i.putExtra(GROUP_ID, groupId.getBytes());
-				i.setFlags(FLAG_ACTIVITY_CLEAR_TOP);
-				getContext().startActivity(i);
-			}
-		});
 	}
 
-	public void unsetBlogLink() {
+	public void setAuthorNotClickable() {
 		setClickable(false);
 		setBackgroundResource(android.R.color.transparent);
 		setOnClickListener(null);

briar-android/src/main/java/org/briarproject/briar/android/view/UnreadMessageButton.java

@@ -2,7 +2,6 @@ package org.briarproject.briar.android.view;
 
 import android.content.Context;
 import android.content.res.TypedArray;
-import android.support.annotation.Nullable;
 import android.support.annotation.UiThread;
 import android.support.design.widget.FloatingActionButton;
 import android.util.AttributeSet;
@@ -13,6 +12,8 @@ import android.widget.TextView;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.briar.R;
 
+import javax.annotation.Nullable;
+
 @UiThread
 @NotNullByDefault
 public class UnreadMessageButton extends FrameLayout {
@@ -36,8 +37,7 @@ public class UnreadMessageButton extends FrameLayout {
 
 		LayoutInflater inflater = (LayoutInflater) context
 				.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
-		inflater
+		inflater.inflate(R.layout.unread_message_button, this, true);
-				.inflate(R.layout.unread_message_button, this, true);
 
 		fab = (FloatingActionButton) findViewById(R.id.fab);
 		unread = (TextView) findViewById(R.id.unreadCountView);
@@ -64,15 +64,11 @@ public class UnreadMessageButton extends FrameLayout {
 
 	public void setUnreadCount(int count) {
 		if (count == 0) {
-			fab.setVisibility(GONE);
+			setVisibility(INVISIBLE);
-//			fab.hide();
-			unread.setVisibility(GONE);
 		} else {
 			// FIXME: Use animations when upgrading to support library 24.2.0
 			//        https://code.google.com/p/android/issues/detail?id=216469
-			fab.setVisibility(VISIBLE);
+			setVisibility(VISIBLE);
-//			if (!fab.isShown()) fab.show();
-			unread.setVisibility(VISIBLE);
 			unread.setText(String.valueOf(count));
 		}
 	}

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

@@ -0,0 +1,51 @@
+package org.briarproject.briar.android.widget;
+
+import android.content.Context;
+import android.support.annotation.AttrRes;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+import android.widget.FrameLayout;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import javax.annotation.Nullable;
+
+import static android.view.MotionEvent.FLAG_WINDOW_IS_OBSCURED;
+
+@NotNullByDefault
+public class TapSafeFrameLayout extends FrameLayout {
+
+	@Nullable
+	private OnTapFilteredListener listener;
+
+	public TapSafeFrameLayout(Context context) {
+		super(context);
+		setFilterTouchesWhenObscured(false);
+	}
+
+	public TapSafeFrameLayout(Context context, @Nullable AttributeSet attrs) {
+		super(context, attrs);
+		setFilterTouchesWhenObscured(false);
+	}
+
+	public TapSafeFrameLayout(Context context, @Nullable AttributeSet attrs,
+			@AttrRes int defStyleAttr) {
+		super(context, attrs, defStyleAttr);
+		setFilterTouchesWhenObscured(false);
+	}
+
+	public void setOnTapFilteredListener(OnTapFilteredListener listener) {
+		this.listener = listener;
+	}
+
+	@Override
+	public boolean onFilterTouchEventForSecurity(MotionEvent e) {
+		boolean filter = (e.getFlags() & FLAG_WINDOW_IS_OBSCURED) != 0;
+		if (filter && listener != null) listener.onTapFiltered();
+		return !filter;
+	}
+
+	public interface OnTapFilteredListener {
+		void onTapFiltered();
+	}
+}

briar-android/src/main/java/org/briarproject/briar/api/android/AndroidNotificationManager.java

@@ -18,19 +18,14 @@ public interface AndroidNotificationManager {
 	String PREF_NOTIFY_RINGTONE_NAME = "notifyRingtoneName";
 	String PREF_NOTIFY_RINGTONE_URI = "notifyRingtoneUri";
 	String PREF_NOTIFY_VIBRATION = "notifyVibration";
+	String PREF_NOTIFY_LOCK_SCREEN = "notifyLockScreen";
 
 	void clearContactNotification(ContactId c);
 
-	void clearAllContactNotifications();
-
 	void clearGroupMessageNotification(GroupId g);
 
-	void clearAllGroupMessageNotifications();
-
 	void clearForumPostNotification(GroupId g);
 
-	void clearAllForumPostNotifications();
-
 	void clearBlogPostNotification(GroupId g);
 
 	void clearAllBlogPostNotifications();
@@ -43,18 +38,6 @@ public interface AndroidNotificationManager {
 
 	void unblockNotification(GroupId g);
 
-	void blockAllContactNotifications();
-
-	void unblockAllContactNotifications();
-
-	void blockAllGroupMessageNotifications();
-
-	void unblockAllGroupMessageNotifications();
-
-	void blockAllForumPostNotifications();
-
-	void unblockAllForumPostNotifications();
-
 	void blockAllBlogPostNotifications();
 
 	void unblockAllBlogPostNotifications();

briar-android/src/main/java/org/briarproject/briar/api/android/ScreenFilterMonitor.java

@@ -2,14 +2,10 @@ package org.briarproject.briar.api.android;
 
 import android.support.annotation.UiThread;
 
-import java.util.Collection;
 import java.util.Set;
 
 public interface ScreenFilterMonitor {
 
 	@UiThread
 	Set<String> getApps();
-
-	@UiThread
-	void storeAppsAsShown(Collection<String> s, boolean persistent);
 }

briar-android/src/main/java/org/thoughtcrime/securesms/components/emoji/EmojiPageView.java

@@ -104,8 +104,9 @@ public class EmojiPageView extends FrameLayout {
 								emojiSize + 2 * pad));
 				view = emojiView;
 			}
+			String emoji = model.getEmoji()[position];
+			view.setEmoji(emoji);
 
-			view.setEmoji(model.getEmoji()[position]);
 			return view;
 		}
 	}

briar-android/src/main/java/org/thoughtcrime/securesms/components/emoji/EmojiTextView.java

@@ -1,29 +1,21 @@
 package org.thoughtcrime.securesms.components.emoji;
 
 import android.content.Context;
-import android.graphics.Paint.FontMetricsInt;
 import android.graphics.drawable.Drawable;
 import android.support.annotation.NonNull;
 import android.support.annotation.UiThread;
-import android.text.TextUtils;
+import android.support.v7.widget.AppCompatTextView;
 import android.util.AttributeSet;
 import android.view.ViewConfiguration;
-import android.widget.TextView;
 
 import org.thoughtcrime.securesms.components.emoji.EmojiProvider.EmojiDrawable;
 
 import javax.annotation.Nullable;
 
-import static android.text.TextUtils.TruncateAt.END;
-import static android.view.View.MeasureSpec.AT_MOST;
-import static android.view.View.MeasureSpec.EXACTLY;
 import static android.widget.TextView.BufferType.SPANNABLE;
 
 @UiThread
-public class EmojiTextView extends TextView {
+public class EmojiTextView extends AppCompatTextView {
-
-	private CharSequence source;
-	private boolean needsEllipsizing;
 
 	public EmojiTextView(Context context) {
 		this(context, null);
@@ -42,13 +34,9 @@ public class EmojiTextView extends TextView {
 
 	@Override
 	public void setText(@Nullable CharSequence text, BufferType type) {
-		source = EmojiProvider.getInstance(getContext()).emojify(text, this);
+		CharSequence source =
-
+				EmojiProvider.getInstance(getContext()).emojify(text, this);
-		setTextEllipsized(source);
+		super.setText(source, SPANNABLE);
-	}
-
-	private void setTextEllipsized(final @Nullable CharSequence source) {
-		super.setText(needsEllipsizing ? ellipsize(source) : source, SPANNABLE);
 	}
 
 	@Override
@@ -57,26 +45,6 @@ public class EmojiTextView extends TextView {
 		else super.invalidateDrawable(drawable);
 	}
 
-	@Override
-	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
-		final int size = MeasureSpec.getSize(widthMeasureSpec);
-		final int mode = MeasureSpec.getMode(widthMeasureSpec);
-		if (getEllipsize() == END &&
-				!TextUtils.isEmpty(source) &&
-				(mode == AT_MOST || mode == EXACTLY) &&
-				getPaint().breakText(source, 0, source.length() - 1, true, size,
-						null) != source.length()) {
-			needsEllipsizing = true;
-			FontMetricsInt font = getPaint().getFontMetricsInt();
-			int height = Math.abs(font.top - font.bottom);
-			super.onMeasure(MeasureSpec.makeMeasureSpec(size, EXACTLY),
-					MeasureSpec.makeMeasureSpec(height, EXACTLY));
-		} else {
-			needsEllipsizing = false;
-			super.onMeasure(widthMeasureSpec, heightMeasureSpec);
-		}
-	}
-
 	@Override
 	protected void onLayout(boolean changed, int left, int top, int right,
 			int bottom) {
@@ -89,20 +57,6 @@ public class EmojiTextView extends TextView {
 		if (size > drawingCacheSize) {
 			setLayerType(LAYER_TYPE_NONE, null);
 		}
-
-		if (changed) setTextEllipsized(source);
 		super.onLayout(changed, left, top, right, bottom);
 	}
-
-	@Nullable
-	public CharSequence ellipsize(@Nullable CharSequence text) {
-		if (TextUtils.isEmpty(text) || getWidth() == 0 ||
-				getEllipsize() != END) {
-			return text;
-		} else {
-			return TextUtils.ellipsize(text, getPaint(),
-					getWidth() - getPaddingRight() - getPaddingLeft(), END);
-		}
-	}
-
 }

briar-android/src/main/java/org/thoughtcrime/securesms/components/emoji/RecentEmojiPageModel.java

@@ -32,7 +32,7 @@ public class RecentEmojiPageModel implements EmojiPageModel {
 	private static final Logger LOG =
 			Logger.getLogger(RecentEmojiPageModel.class.getName());
 
-	private static final String EMOJI_LRU_PREFERENCE = "pref_emoji_recent";
+	private static final String EMOJI_LRU_PREFERENCE = "pref_emoji_recent2";
 	private static final int EMOJI_LRU_SIZE = 50;
 
 	private final LinkedHashSet<String> recentlyUsed; // UI thread
@@ -98,12 +98,12 @@ public class RecentEmojiPageModel implements EmojiPageModel {
 	}
 
 	private String serialize(LinkedHashSet<String> emojis) {
-		return StringUtils.join(emojis, ";");
+		return StringUtils.join(emojis, "\t");
 	}
 
 	private LinkedHashSet<String> deserialize(@Nullable String serialized) {
 		if (serialized == null) return new LinkedHashSet<>();
-		String[] list = serialized.split(";");
+		String[] list = serialized.split("\t");
 		LinkedHashSet<String> result = new LinkedHashSet<>(list.length);
 		Collections.addAll(result, list);
 		return result;

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

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="18dp"
+        android:height="18dp"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+	<path
+		android:fillColor="#FFFFFFFF"
+		android:pathData="M19,6.41L17.59,5 12,10.59 6.41,5 5,6.41 10.59,12 5,17.59 6.41,19 12,13.41 17.59,19 19,17.59 13.41,12z"/>
+</vector>

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

@@ -7,7 +7,7 @@
 
 	<path
 		android:fillColor="#ffa500"
-		android:pathData="M0,8.88178e-16 L30,8.88178e-16 L30,30 L0,30 L0,8.88178e-16 Z"/>
+		android:pathData="M0,0 L30,0 L30,30 L0,30 L0,0 Z"/>
 	<path
 		android:fillColor="#ffffff"
 		android:pathData="M8.9322,18.0339 C10.6078,18.0339,11.9661,19.3922,11.9661,21.0678

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

@@ -12,9 +12,9 @@
 		android:fillColor="#87c214"
 		android:pathData="M64.9004,0 C55.2004,0,47.1992,7.99922,47.1992,17.6992 L47.1992,40.1992
 L90.8008,40.1992 L90.8008,17.6992
-C90.8008,7.99922,82.8992,-4.73695e-15,73.1992,0 L64.9004,0 Z M161.9,0
+C90.8008,7.99922,82.8992,0,73.1992,0 L64.9004,0 Z M161.9,0
 C152.2,0,144.199,7.99922,144.199,17.6992 L144.199,137.199 L187.801,137.199
-L187.801,17.6992 C187.801,7.99922,179.899,-4.73695e-15,170.199,0 L161.9,0 Z
+L187.801,17.6992 C187.801,7.99922,179.899,0,170.199,0 L161.9,0 Z
 M47.1992,97.8008 L47.1992,217.301 C47.1992,227.001,55.1004,235,64.9004,235
 L73.1992,235 C82.8992,235,90.9004,227.001,90.9004,217.301 L90.9004,97.8008
 L47.1992,97.8008 Z M144.199,194.801 L144.199,217.301
@@ -25,12 +25,12 @@ C179.899,235,187.9,227.001,187.9,217.301 L187.9,194.801 L144.199,194.801 Z"/>
 		android:pathData="M144.2,144.2 L187.9,144.2 L187.9,187.9 L144.2,187.9 L144.2,144.2 Z"/>
 	<path
 		android:fillColor="#95d220"
-		android:pathData="M17.6992,47.1992 C7.99922,47.1992,2.36848e-15,55.1004,0,64.9004 L0,73.1992
+		android:pathData="M17.6992,47.1992 C7.99922,47.1992,0,55.1004,0,64.9004 L0,73.1992
 C0,82.8992,7.89922,90.9004,17.6992,90.9004 L137.199,90.9004 L137.199,47.1992
 L17.6992,47.1992 Z M194.801,47.1992 L194.801,90.9004 L217.301,90.9004
 C227.001,90.9004,235,82.9992,235,73.1992 L235,64.9004
 C235,55.1004,227.001,47.1992,217.301,47.1992 L194.801,47.1992 Z M17.6992,144.199
-C7.99922,144.199,2.36848e-15,152.1,0,161.9 L0,170.199
+C7.99922,144.199,0,152.1,0,161.9 L0,170.199
 C0,179.899,7.89922,187.9,17.6992,187.9 L40.1992,187.9 L40.1992,144.199
 L17.6992,144.199 Z M97.8008,144.199 L97.8008,187.9 L217.301,187.9
 C227.001,187.9,235,179.899,235,170.199 L235,161.9

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

@@ -1,44 +1,42 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout
 	xmlns:android="http://schemas.android.com/apk/res/android"
-	android:orientation="vertical"
+	xmlns:app="http://schemas.android.com/apk/res-auto"
+	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent"
-	android:gravity="center_horizontal"
+	android:orientation="vertical"
-	android:padding="20dp" >
+	android:padding="@dimen/margin_large">
 
-	<TextView
+	<android.support.design.widget.TextInputLayout
-		android:layout_width="wrap_content"
+		android:id="@+id/createForumNameLayout"
-		android:layout_height="wrap_content"
-		android:gravity="center"
-		android:textSize="@dimen/text_size_medium"
-		android:text="@string/choose_forum_name" />
-
-	<EditText
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
-		android:id="@+id/createForumNameEntry"
+		app:errorEnabled="true">
-		android:maxLines="1"
-		android:inputType="text|textCapSentences" />
 
-	<TextView
+		<EditText
-		android:layout_width="wrap_content"
+			android:id="@+id/createForumNameEntry"
+			android:layout_width="match_parent"
 			android:layout_height="wrap_content"
-		android:id="@+id/createForumFeedback"
+			android:hint="@string/choose_forum_hint"
-		android:gravity="center"
+			android:inputType="text|textCapSentences"
-		android:paddingLeft="50dp"
+			android:maxLines="1"/>
-		android:paddingRight="50dp" />
+
+	</android.support.design.widget.TextInputLayout>
 
 	<Button
-		style="@style/BriarButton"
 		android:id="@+id/createForumButton"
-		android:text="@string/create_forum_button" />
+		style="@style/BriarButton"
+		android:enabled="false"
+		android:text="@string/create_forum_button"/>
 
 	<ProgressBar
 		android:id="@+id/createForumProgressBar"
-		android:layout_height="wrap_content"
 		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_gravity="center"
 		android:indeterminate="true"
-		android:visibility="gone" />
+		android:visibility="gone"
+		tools:visibility="visible"/>
 
 </LinearLayout>