Changed the root package from net.sf.briar to org.briarproject.

briar-android/src/org/briarproject/android/AndroidExecutorImpl.java

@@ -0,0 +1,82 @@
+package org.briarproject.android;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+import java.util.concurrent.FutureTask;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import javax.inject.Inject;
+
+import org.briarproject.api.android.AndroidExecutor;
+import android.os.Handler;
+import android.os.Looper;
+import android.os.Message;
+
+class AndroidExecutorImpl implements AndroidExecutor {
+
+	private static final int SHUTDOWN = 0, RUN = 1;
+
+	private final Runnable loop;
+	private final AtomicBoolean started = new AtomicBoolean(false);
+	private final CountDownLatch startLatch = new CountDownLatch(1);
+
+	private volatile Handler handler = null;
+
+	@Inject
+	AndroidExecutorImpl() {
+		loop = new Runnable() {
+			public void run() {
+				Looper.prepare();
+				handler = new FutureTaskHandler();
+				startLatch.countDown();
+				Looper.loop();
+			}
+		};
+	}
+
+	private void startIfNecessary() {
+		if(started.getAndSet(true)) return;
+		new Thread(loop, "AndroidExecutor").start();
+		try {
+			startLatch.await();
+		} catch(InterruptedException e) {
+			Thread.currentThread().interrupt();
+		}
+	}
+
+	public <V> V call(Callable<V> c) throws InterruptedException,
+	ExecutionException {
+		startIfNecessary();
+		Future<V> f = new FutureTask<V>(c);
+		Message m = Message.obtain(handler, RUN, f);
+		handler.sendMessage(m);
+		return f.get();
+	}
+
+	public void shutdown() {
+		if(handler != null) {
+			Message m = Message.obtain(handler, SHUTDOWN);
+			handler.sendMessage(m);
+		}
+	}
+
+	private static class FutureTaskHandler extends Handler {
+
+		@Override
+		public void handleMessage(Message m) {
+			switch(m.what) {
+			case SHUTDOWN:
+				Looper.myLooper().quit();
+				break;
+			case RUN:
+				((FutureTask<?>) m.obj).run();
+				break;
+			default:
+				throw new IllegalArgumentException();
+			}
+		}
+	}
+}
+

briar-android/src/org/briarproject/android/AndroidFileUtils.java

@@ -0,0 +1,19 @@
+package org.briarproject.android;
+
+import java.io.File;
+import java.io.IOException;
+
+import org.briarproject.api.system.FileUtils;
+import android.os.Build;
+import android.os.StatFs;
+
+class AndroidFileUtils implements FileUtils {
+
+	@SuppressWarnings("deprecation")
+	public long getFreeSpace(File f) throws IOException {
+		if(Build.VERSION.SDK_INT >= 9) return f.getUsableSpace();
+		StatFs s = new StatFs(f.getAbsolutePath());
+		// These deprecated methods are the best thing available for SDK < 9
+		return (long) s.getAvailableBlocks() * s.getBlockSize();
+	}
+}

briar-android/src/org/briarproject/android/AndroidModule.java

@@ -0,0 +1,148 @@
+package org.briarproject.android;
+
+import static android.content.Context.MODE_PRIVATE;
+import static java.util.concurrent.TimeUnit.SECONDS;
+
+import java.io.File;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.Executor;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.RejectedExecutionHandler;
+import java.util.concurrent.ThreadPoolExecutor;
+
+import javax.inject.Singleton;
+
+import org.briarproject.api.android.AndroidExecutor;
+import org.briarproject.api.android.DatabaseUiExecutor;
+import org.briarproject.api.android.ReferenceManager;
+import org.briarproject.api.crypto.CryptoComponent;
+import org.briarproject.api.db.DatabaseConfig;
+import org.briarproject.api.lifecycle.LifecycleManager;
+import org.briarproject.api.lifecycle.ShutdownManager;
+import org.briarproject.api.plugins.PluginExecutor;
+import org.briarproject.api.plugins.duplex.DuplexPluginConfig;
+import org.briarproject.api.plugins.duplex.DuplexPluginFactory;
+import org.briarproject.api.plugins.simplex.SimplexPluginConfig;
+import org.briarproject.api.plugins.simplex.SimplexPluginFactory;
+import org.briarproject.api.system.FileUtils;
+import org.briarproject.api.ui.UiCallback;
+import org.briarproject.plugins.droidtooth.DroidtoothPluginFactory;
+import org.briarproject.plugins.tcp.DroidLanTcpPluginFactory;
+import org.briarproject.plugins.tcp.WanTcpPluginFactory;
+import org.briarproject.plugins.tor.TorPluginFactory;
+import android.app.Application;
+import android.content.Context;
+
+import com.google.inject.AbstractModule;
+import com.google.inject.Provides;
+
+public class AndroidModule extends AbstractModule {
+
+	private final ExecutorService databaseUiExecutor;
+	private final UiCallback uiCallback;
+
+	public AndroidModule() {
+		// The queue is unbounded, so tasks can be dependent
+		BlockingQueue<Runnable> queue = new LinkedBlockingQueue<Runnable>();
+		// Discard tasks that are submitted during shutdown
+		RejectedExecutionHandler policy =
+				new ThreadPoolExecutor.DiscardPolicy();
+		// Use a single thread so DB accesses from the UI don't overlap
+		databaseUiExecutor = new ThreadPoolExecutor(1, 1, 60, SECONDS, queue,
+				policy);
+		// Use a dummy UI callback
+		uiCallback = new UiCallback() {
+
+			public int showChoice(String[] options, String... message) {
+				throw new UnsupportedOperationException();
+			}
+
+			public boolean showConfirmationMessage(String... message) {
+				throw new UnsupportedOperationException();
+			}
+
+			public void showMessage(String... message) {
+				throw new UnsupportedOperationException();
+			}			
+		};
+	}
+
+	protected void configure() {
+		bind(AndroidExecutor.class).to(AndroidExecutorImpl.class);
+		bind(ReferenceManager.class).to(
+				ReferenceManagerImpl.class).in(Singleton.class);
+		bind(FileUtils.class).to(AndroidFileUtils.class);
+		bind(UiCallback.class).toInstance(uiCallback);
+	}
+
+	@Provides @Singleton @DatabaseUiExecutor
+	Executor getDatabaseUiExecutor(LifecycleManager lifecycleManager) {
+		lifecycleManager.registerForShutdown(databaseUiExecutor);
+		return databaseUiExecutor;
+	}
+
+	@Provides
+	SimplexPluginConfig getSimplexPluginConfig() {
+		return new SimplexPluginConfig() {
+			public Collection<SimplexPluginFactory> getFactories() {
+				return Collections.emptyList();
+			}
+		};
+	}
+
+	@Provides
+	DuplexPluginConfig getDuplexPluginConfig(
+			@PluginExecutor Executor pluginExecutor,
+			AndroidExecutor androidExecutor, Context appContext,
+			CryptoComponent crypto, ShutdownManager shutdownManager) {
+		DuplexPluginFactory droidtooth = new DroidtoothPluginFactory(
+				pluginExecutor, androidExecutor, appContext,
+				crypto.getSecureRandom());
+		DuplexPluginFactory tor = new TorPluginFactory(pluginExecutor,
+				appContext, shutdownManager);
+		DuplexPluginFactory lan = new DroidLanTcpPluginFactory(pluginExecutor,
+				appContext);
+		DuplexPluginFactory wan = new WanTcpPluginFactory(pluginExecutor,
+				shutdownManager);
+		final Collection<DuplexPluginFactory> factories =
+				Arrays.asList(droidtooth, tor, lan, wan);
+		return new DuplexPluginConfig() {
+			public Collection<DuplexPluginFactory> getFactories() {
+				return factories;
+			}
+		};
+	}
+
+	@Provides @Singleton
+	DatabaseConfig getDatabaseConfig(final Application app) {
+		final File dir = app.getApplicationContext().getDir("db", MODE_PRIVATE);
+		return new DatabaseConfig() {
+
+			private volatile byte[] key = null;
+
+			public boolean databaseExists() {
+				return dir.isDirectory() && dir.listFiles().length > 0;
+			}
+
+			public File getDatabaseDirectory() {
+				return dir;
+			}
+
+			public void setEncryptionKey(byte[] key) {
+				this.key = key;
+			}
+
+			public byte[] getEncryptionKey() {
+				return key;
+			}
+
+			public long getMaxSize() {
+				return Long.MAX_VALUE;
+			}
+		};
+	}
+}

briar-android/src/org/briarproject/android/AscendingHeaderComparator.java

@@ -0,0 +1,19 @@
+package org.briarproject.android;
+
+import java.util.Comparator;
+
+import org.briarproject.api.db.MessageHeader;
+
+public class AscendingHeaderComparator implements Comparator<MessageHeader> {
+
+	public static final AscendingHeaderComparator INSTANCE =
+			new AscendingHeaderComparator();
+
+	public int compare(MessageHeader a, MessageHeader b) {
+		// The oldest message comes first
+		long aTime = a.getTimestamp(), bTime = b.getTimestamp();
+		if(aTime < bTime) return -1;
+		if(aTime > bTime) return 1;
+		return 0;
+	}
+}

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

@@ -0,0 +1,143 @@
+package org.briarproject.android;
+
+import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
+import static android.content.Intent.FLAG_ACTIVITY_SINGLE_TOP;
+import static java.util.logging.Level.INFO;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import org.briarproject.R;
+import org.briarproject.api.android.AndroidExecutor;
+import org.briarproject.api.db.DatabaseConfig;
+import org.briarproject.api.lifecycle.LifecycleManager;
+import roboguice.service.RoboService;
+import android.app.PendingIntent;
+import android.content.ComponentName;
+import android.content.Intent;
+import android.content.ServiceConnection;
+import android.os.Binder;
+import android.os.IBinder;
+import android.support.v4.app.NotificationCompat;
+
+public class BriarService extends RoboService {
+
+	private static final Logger LOG =
+			Logger.getLogger(BriarService.class.getName());
+
+	private final Binder binder = new BriarBinder();
+
+	@Inject private DatabaseConfig databaseConfig;
+	private boolean started = false;
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject private volatile LifecycleManager lifecycleManager;
+	@Inject private volatile AndroidExecutor androidExecutor;
+
+	@Override
+	public void onCreate() {
+		super.onCreate();
+		if(LOG.isLoggable(INFO)) LOG.info("Created");
+		if(databaseConfig.getEncryptionKey() == null) {
+			if(LOG.isLoggable(INFO)) LOG.info("No database key");
+			stopSelf();
+			return;
+		}
+		// Show an ongoing notification that the service is running
+		NotificationCompat.Builder b = new NotificationCompat.Builder(this);
+		b.setSmallIcon(R.drawable.notification_icon);
+		b.setContentTitle(getText(R.string.notification_title));
+		b.setContentText(getText(R.string.notification_text));
+		b.setWhen(0); // Don't show the time
+		// Touch the notification to show the home screen
+		Intent i = new Intent(this, HomeScreenActivity.class);
+		i.setFlags(FLAG_ACTIVITY_CLEAR_TOP | FLAG_ACTIVITY_SINGLE_TOP);
+		PendingIntent pi = PendingIntent.getActivity(this, 0, i, 0);
+		b.setContentIntent(pi);
+		b.setOngoing(true);
+		startForeground(1, b.build());
+		// Start the services in a background thread
+		new Thread() {
+			@Override
+			public void run() {
+				lifecycleManager.startServices();
+			}
+		}.start();
+		started = true;
+	}
+
+	@Override
+	public int onStartCommand(Intent intent, int flags, int startId) {
+		if(LOG.isLoggable(INFO)) LOG.info("Started");
+		return START_NOT_STICKY; // Don't restart automatically if killed
+	}
+
+	public IBinder onBind(Intent intent) {
+		if(LOG.isLoggable(INFO)) LOG.info("Bound");
+		return binder;
+	}
+
+	@Override
+	public void onDestroy() {
+		super.onDestroy();
+		if(LOG.isLoggable(INFO)) LOG.info("Destroyed");
+		// Stop the services in a background thread
+		if(started) new Thread() {
+			@Override
+			public void run() {
+				androidExecutor.shutdown();
+				lifecycleManager.stopServices();
+			}
+		}.start();
+	}
+
+	/** Waits for the database to be opened before returning. */
+	public void waitForDatabase() throws InterruptedException {
+		lifecycleManager.waitForDatabase();
+	}
+
+	/** Waits for all services to start before returning. */
+	public void waitForStartup() throws InterruptedException {
+		lifecycleManager.waitForStartup();
+	}
+
+	/** Waits for all services to stop before returning. */
+	public void waitForShutdown() throws InterruptedException {
+		lifecycleManager.waitForShutdown();
+	}
+
+	/** Starts the shutdown process. */
+	public void shutdown() {
+		stopSelf(); // This will call onDestroy()
+	}
+
+	public class BriarBinder extends Binder {
+
+		/** Returns the bound service. */
+		public BriarService getService() {
+			return BriarService.this;
+		}
+	}
+
+	public static class BriarServiceConnection implements ServiceConnection {
+
+		private final CountDownLatch binderLatch = new CountDownLatch(1);
+
+		private volatile IBinder binder = null;
+
+		public void onServiceConnected(ComponentName name, IBinder binder) {
+			this.binder = binder;
+			binderLatch.countDown();
+		}
+
+		public void onServiceDisconnected(ComponentName name) {}
+
+		/** Waits for the service to connect and returns its binder. */
+		public IBinder waitForBinder() throws InterruptedException {
+			binderLatch.await();
+			return binder;
+		}
+	}
+}

briar-android/src/org/briarproject/android/HomeScreenActivity.java

@@ -0,0 +1,391 @@
+package org.briarproject.android;
+
+import static android.text.InputType.TYPE_CLASS_TEXT;
+import static android.text.InputType.TYPE_TEXT_VARIATION_PASSWORD;
+import static android.view.Gravity.CENTER;
+import static android.view.Gravity.CENTER_HORIZONTAL;
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
+import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
+import static android.view.inputmethod.InputMethodManager.HIDE_IMPLICIT_ONLY;
+import static android.widget.LinearLayout.VERTICAL;
+import static java.util.logging.Level.INFO;
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_MATCH;
+import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import org.briarproject.R;
+import org.briarproject.android.BriarService.BriarBinder;
+import org.briarproject.android.BriarService.BriarServiceConnection;
+import org.briarproject.android.contact.ContactListActivity;
+import org.briarproject.android.groups.GroupListActivity;
+import org.briarproject.api.LocalAuthor;
+import org.briarproject.api.android.DatabaseUiExecutor;
+import org.briarproject.api.android.ReferenceManager;
+import org.briarproject.api.crypto.CryptoComponent;
+import org.briarproject.api.crypto.CryptoExecutor;
+import org.briarproject.api.db.DatabaseComponent;
+import org.briarproject.api.db.DatabaseConfig;
+import org.briarproject.api.db.DbException;
+import org.briarproject.api.lifecycle.LifecycleManager;
+import org.briarproject.util.StringUtils;
+import roboguice.activity.RoboActivity;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.os.IBinder;
+import android.text.Editable;
+import android.view.KeyEvent;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.ViewGroup;
+import android.view.inputmethod.InputMethodManager;
+import android.widget.BaseAdapter;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.GridView;
+import android.widget.LinearLayout;
+import android.widget.ListView;
+import android.widget.ProgressBar;
+import android.widget.TextView;
+import android.widget.TextView.OnEditorActionListener;
+
+public class HomeScreenActivity extends RoboActivity {
+
+	// This build expires on 15 January 2014
+	private static final long EXPIRY_DATE = 1389657600 * 1000L;
+
+	private static final Logger LOG =
+			Logger.getLogger(HomeScreenActivity.class.getName());
+
+	private final BriarServiceConnection serviceConnection =
+			new BriarServiceConnection();
+
+	@Inject private ReferenceManager referenceManager;
+	@Inject private DatabaseConfig databaseConfig;
+	@Inject @DatabaseUiExecutor private Executor dbUiExecutor;
+	@Inject @CryptoExecutor private Executor cryptoExecutor;
+	private boolean bound = false;
+	private TextView enterPassword = null;
+	private Button continueButton = null;
+	private ProgressBar progress = null;
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject private volatile CryptoComponent crypto;
+	@Inject private volatile DatabaseComponent db;
+	@Inject private volatile LifecycleManager lifecycleManager;
+
+	@Override
+	public void onCreate(Bundle state) {
+		super.onCreate(state);
+		Intent i = getIntent();
+		long handle = i.getLongExtra("org.briarproject.LOCAL_AUTHOR_HANDLE", -1);
+		if(handle != -1) {
+			// The activity was launched from the setup wizard
+			if(System.currentTimeMillis() < EXPIRY_DATE) {
+				showSpinner();
+				startService(new Intent(BriarService.class.getName()));
+				bindService();
+				LocalAuthor a = referenceManager.removeReference(handle,
+						LocalAuthor.class);
+				// The reference may be null if the activity has been recreated,
+				// for example due to screen rotation
+				if(a == null) showButtons();
+				else storeLocalAuthor(a);
+			} else {
+				showExpiryWarning();
+			}
+		} else if(databaseConfig.getEncryptionKey() == null) {
+			// The activity was launched from the splash screen
+			if(System.currentTimeMillis() < EXPIRY_DATE) showPasswordPrompt();
+			else showExpiryWarning();
+		} else {
+			// The activity has been launched before
+			showButtons();
+			bindService();
+		}
+	}
+
+	private void showSpinner() {
+		LinearLayout layout = new LinearLayout(this);
+		layout.setLayoutParams(MATCH_MATCH);
+		layout.setGravity(CENTER);
+		ProgressBar progress = new ProgressBar(this);
+		progress.setIndeterminate(true);
+		layout.addView(progress);
+		setContentView(layout);
+	}
+
+	private void bindService() {
+		bound = bindService(new Intent(BriarService.class.getName()),
+				serviceConnection, 0);
+	}
+
+	private void quit() {
+		new Thread() {
+			@Override
+			public void run() {
+				try {
+					// Wait for the service to finish starting up
+					IBinder binder = serviceConnection.waitForBinder();
+					BriarService service = ((BriarBinder) binder).getService();
+					service.waitForStartup();
+					// Shut down the service and wait for it to shut down
+					if(LOG.isLoggable(INFO)) LOG.info("Shutting down service");
+					service.shutdown();
+					service.waitForShutdown();
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for service");
+				}
+				// Finish the activity and kill the JVM
+				runOnUiThread(new Runnable() {
+					public void run() {
+						finish();
+						if(LOG.isLoggable(INFO)) LOG.info("Exiting");
+						System.exit(0);
+					}
+				});
+			}
+		}.start();
+	}
+
+	private void storeLocalAuthor(final LocalAuthor a) {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					db.addLocalAuthor(a);
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Storing author took " + duration + " ms");
+					runOnUiThread(new Runnable() {
+						public void run() {
+							showButtons();
+						}
+					});
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+			}
+		});
+	}
+
+	private void showPasswordPrompt() {
+		SharedPreferences prefs = getSharedPreferences("db", MODE_PRIVATE);
+		String hex = prefs.getString("key", null);
+		if(hex == null) throw new IllegalStateException();
+		final byte[] encrypted = StringUtils.fromHexString(hex);
+
+		LinearLayout layout = new LinearLayout(this);
+		layout.setLayoutParams(MATCH_MATCH);
+		layout.setOrientation(VERTICAL);
+		layout.setGravity(CENTER_HORIZONTAL);
+
+		enterPassword = new TextView(this);
+		enterPassword.setGravity(CENTER);
+		enterPassword.setTextSize(18);
+		enterPassword.setPadding(10, 10, 10, 0);
+		enterPassword.setText(R.string.enter_password);
+		layout.addView(enterPassword);
+
+		final EditText passwordEntry = new EditText(this);
+		passwordEntry.setId(1);
+		passwordEntry.setMaxLines(1);
+		int inputType = TYPE_CLASS_TEXT | TYPE_TEXT_VARIATION_PASSWORD;
+		passwordEntry.setInputType(inputType);
+		passwordEntry.setOnEditorActionListener(new OnEditorActionListener() {
+			public boolean onEditorAction(TextView v, int action, KeyEvent e) {
+				validatePassword(encrypted, passwordEntry.getText());
+				return true;
+			}
+		});
+		layout.addView(passwordEntry);
+
+		continueButton = new Button(this);
+		continueButton.setLayoutParams(WRAP_WRAP);
+		continueButton.setText(R.string.continue_button);
+		continueButton.setOnClickListener(new OnClickListener() {
+			public void onClick(View v) {
+				validatePassword(encrypted, passwordEntry.getText());
+			}
+		});
+		layout.addView(continueButton);
+
+		progress = new ProgressBar(this);
+		progress.setLayoutParams(WRAP_WRAP);
+		progress.setIndeterminate(true);
+		progress.setVisibility(GONE);
+		layout.addView(progress);
+		setContentView(layout);
+	}
+
+	private void validatePassword(final byte[] encrypted, Editable e) {
+		if(enterPassword == null || continueButton == null || progress == null)
+			return;
+		// Hide the soft keyboard
+		Object o = getSystemService(INPUT_METHOD_SERVICE);
+		((InputMethodManager) o).toggleSoftInput(HIDE_IMPLICIT_ONLY, 0);
+		// Replace the button with a progress bar
+		continueButton.setVisibility(GONE);
+		progress.setVisibility(VISIBLE);
+		// Decrypt the database key in a background thread
+		int length = e.length();
+		final char[] password = new char[length];
+		e.getChars(0, length, password, 0);
+		e.delete(0, length);
+		cryptoExecutor.execute(new Runnable() {
+			public void run() {
+				byte[] key = crypto.decryptWithPassword(encrypted, password);
+				if(key == null) {
+					tryAgain();
+				} else {
+					databaseConfig.setEncryptionKey(key);
+					showButtonsAndStartService();
+				}
+			}
+		});
+	}
+
+	private void tryAgain() {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				enterPassword.setText(R.string.try_again);
+				continueButton.setVisibility(VISIBLE);
+				progress.setVisibility(GONE);
+			}
+		});
+	}
+
+	private void showButtonsAndStartService() {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				showButtons();
+				startService(new Intent(BriarService.class.getName()));
+				bindService();
+			}
+		});
+	}
+
+	private void showExpiryWarning() {
+		LinearLayout layout = new LinearLayout(this);
+		layout.setLayoutParams(MATCH_MATCH);
+		layout.setGravity(CENTER);
+		TextView warning = new TextView(this);
+		warning.setGravity(CENTER);
+		warning.setTextSize(18);
+		warning.setPadding(10, 10, 10, 10);
+		warning.setText(R.string.expiry_warning);
+		layout.addView(warning);
+		setContentView(layout);
+	}
+
+	private void showButtons() {
+		ListView.LayoutParams matchMatch =
+				new ListView.LayoutParams(MATCH_PARENT, MATCH_PARENT);
+		final List<Button> buttons = new ArrayList<Button>();
+
+		Button contactsButton = new Button(this);
+		contactsButton.setLayoutParams(matchMatch);
+		contactsButton.setBackgroundResource(0);
+		contactsButton.setCompoundDrawablesWithIntrinsicBounds(0,
+				R.drawable.social_person, 0, 0);
+		contactsButton.setText(R.string.contact_list_button);
+		contactsButton.setOnClickListener(new OnClickListener() {
+			public void onClick(View view) {
+				startActivity(new Intent(HomeScreenActivity.this,
+						ContactListActivity.class));
+			}
+		});
+		buttons.add(contactsButton);
+
+		Button forumsButton = new Button(this);
+		forumsButton.setLayoutParams(matchMatch);
+		forumsButton.setBackgroundResource(0);
+		forumsButton.setCompoundDrawablesWithIntrinsicBounds(0,
+				R.drawable.social_chat, 0, 0);
+		forumsButton.setText(R.string.forums_button);
+		forumsButton.setOnClickListener(new OnClickListener() {
+			public void onClick(View view) {
+				startActivity(new Intent(HomeScreenActivity.this,
+						GroupListActivity.class));
+			}
+		});
+		buttons.add(forumsButton);
+
+		Button syncButton = new Button(this);
+		syncButton.setLayoutParams(matchMatch);
+		syncButton.setBackgroundResource(0);
+		syncButton.setCompoundDrawablesWithIntrinsicBounds(0,
+				R.drawable.navigation_refresh, 0, 0);
+		syncButton.setText(R.string.synchronize_button);
+		syncButton.setOnClickListener(new OnClickListener() {
+			public void onClick(View view) {
+				// FIXME: Crash testing, remove this
+				throw new RuntimeException();
+			}
+		});
+		buttons.add(syncButton);
+
+		Button quitButton = new Button(this);
+		quitButton.setLayoutParams(matchMatch);
+		quitButton.setBackgroundResource(0);
+		quitButton.setCompoundDrawablesWithIntrinsicBounds(0,
+				R.drawable.device_access_accounts, 0, 0);
+		quitButton.setText(R.string.quit_button);
+		quitButton.setOnClickListener(new OnClickListener() {
+			public void onClick(View view) {
+				showSpinner();
+				quit();
+			}
+		});
+		buttons.add(quitButton);
+
+		GridView grid = new GridView(this);
+		grid.setLayoutParams(matchMatch);
+		grid.setGravity(CENTER);
+		grid.setPadding(5, 5, 5, 5);
+		grid.setBackgroundColor(getResources().getColor(
+				R.color.home_screen_background));
+		grid.setNumColumns(2);
+		grid.setAdapter(new BaseAdapter() {
+
+			public int getCount() {
+				return buttons.size();
+			}
+
+			public Object getItem(int position) {
+				return buttons.get(position);
+			}
+
+			public long getItemId(int position) {
+				return 0;
+			}
+
+			public View getView(int position, View convertView,
+					ViewGroup parent) {
+				return buttons.get(position);
+			}
+		});
+		setContentView(grid);
+	}
+
+	@Override
+	public void onDestroy() {
+		super.onDestroy();
+		if(bound) unbindService(serviceConnection);
+	}
+}

briar-android/src/org/briarproject/android/ReferenceManagerImpl.java

@@ -0,0 +1,61 @@
+package org.briarproject.android;
+
+import static java.util.logging.Level.INFO;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.logging.Logger;
+
+import org.briarproject.api.android.ReferenceManager;
+
+class ReferenceManagerImpl implements ReferenceManager {
+
+	private static final Logger LOG =
+			Logger.getLogger(ReferenceManagerImpl.class.getName());
+
+	// Locking: this
+	private final Map<Class<?>, Map<Long, Object>> outerMap =
+			new HashMap<Class<?>, Map<Long, Object>>();
+
+	private long nextHandle = 0; // Locking: this
+
+	public synchronized <T> T getReference(long handle, Class<T> c) {
+		Map<Long, Object> innerMap = outerMap.get(c);
+		if(innerMap == null) {
+			if(LOG.isLoggable(INFO))
+				LOG.info("0 handles for " + c.getName());
+			return null;
+		}
+		if(LOG.isLoggable(INFO))
+			LOG.info(innerMap.size() + " handles for " + c.getName());
+		Object o = innerMap.get(handle);
+		return c.cast(o);
+	}
+
+	public synchronized <T> long putReference(T reference, Class<T> c) {
+		Map<Long, Object> innerMap = outerMap.get(c);
+		if(innerMap == null) {
+			innerMap = new HashMap<Long, Object>();
+			outerMap.put(c, innerMap);
+		}
+		long handle = nextHandle++;
+		innerMap.put(handle, reference);
+		if(LOG.isLoggable(INFO)) {
+			LOG.info(innerMap.size() + " handles for " + c.getName() +
+					" after put");
+		}
+		return handle;
+	}
+
+	public synchronized <T> T removeReference(long handle, Class<T> c) {
+		Map<Long, Object> innerMap = outerMap.get(c);
+		if(innerMap == null) return null;
+		Object o = innerMap.remove(handle);
+		if(innerMap.isEmpty()) outerMap.remove(c);
+		if(LOG.isLoggable(INFO)) {
+			LOG.info(innerMap.size() + " handles for " + c.getName() +
+					" after remove");
+		}
+		return c.cast(o);
+	}
+}

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

@@ -0,0 +1,225 @@
+package org.briarproject.android;
+
+import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
+import static android.text.InputType.TYPE_CLASS_TEXT;
+import static android.text.InputType.TYPE_TEXT_FLAG_CAP_WORDS;
+import static android.text.InputType.TYPE_TEXT_VARIATION_PASSWORD;
+import static android.view.Gravity.CENTER;
+import static android.view.Gravity.CENTER_HORIZONTAL;
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
+import static android.widget.LinearLayout.VERTICAL;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_MATCH;
+import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP;
+
+import java.util.Arrays;
+import java.util.concurrent.Executor;
+
+import javax.inject.Inject;
+
+import org.briarproject.R;
+import org.briarproject.api.AuthorFactory;
+import org.briarproject.api.LocalAuthor;
+import org.briarproject.api.android.ReferenceManager;
+import org.briarproject.api.crypto.CryptoComponent;
+import org.briarproject.api.crypto.CryptoExecutor;
+import org.briarproject.api.crypto.KeyPair;
+import org.briarproject.api.db.DatabaseConfig;
+import org.briarproject.util.StringUtils;
+import roboguice.activity.RoboActivity;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.content.SharedPreferences.Editor;
+import android.os.Bundle;
+import android.text.Editable;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.LinearLayout;
+import android.widget.ProgressBar;
+import android.widget.ScrollView;
+import android.widget.TextView;
+
+public class SetupActivity extends RoboActivity implements OnClickListener {
+
+	private static final int MIN_PASSWORD_LENGTH = 8;
+
+	@Inject @CryptoExecutor private Executor cryptoExecutor;
+	private EditText nicknameEntry = null;
+	private EditText passwordEntry = null, passwordConfirmation = null;
+	private Button continueButton = null;
+	private ProgressBar progress = null;
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject private volatile CryptoComponent crypto;
+	@Inject private volatile DatabaseConfig databaseConfig;
+	@Inject private volatile AuthorFactory authorFactory;
+	@Inject private volatile ReferenceManager referenceManager;
+
+	@Override
+	public void onCreate(Bundle state) {
+		super.onCreate(state);
+		LinearLayout layout = new LinearLayout(this);
+		layout.setLayoutParams(MATCH_MATCH);
+		layout.setOrientation(VERTICAL);
+		layout.setGravity(CENTER_HORIZONTAL);
+
+		TextView chooseNickname = new TextView(this);
+		chooseNickname.setGravity(CENTER);
+		chooseNickname.setTextSize(18);
+		chooseNickname.setPadding(10, 10, 10, 0);
+		chooseNickname.setText(R.string.choose_nickname);
+		layout.addView(chooseNickname);
+
+		nicknameEntry = new EditText(this) {
+			@Override
+			protected void onTextChanged(CharSequence text, int start,
+					int lengthBefore, int lengthAfter) {
+				enableOrDisableContinueButton();
+			}
+		};
+		nicknameEntry.setId(1);
+		nicknameEntry.setMaxLines(1);
+		int inputType = TYPE_CLASS_TEXT | TYPE_TEXT_FLAG_CAP_WORDS;
+		nicknameEntry.setInputType(inputType);
+		layout.addView(nicknameEntry);
+
+		TextView choosePassword = new TextView(this);
+		choosePassword.setGravity(CENTER);
+		choosePassword.setTextSize(18);
+		choosePassword.setPadding(10, 10, 10, 0);
+		choosePassword.setText(R.string.choose_password);
+		layout.addView(choosePassword);
+
+		passwordEntry = new EditText(this) {
+			@Override
+			protected void onTextChanged(CharSequence text, int start,
+					int lengthBefore, int lengthAfter) {
+				enableOrDisableContinueButton();
+			}
+		};
+		passwordEntry.setId(2);
+		passwordEntry.setMaxLines(1);
+		inputType = TYPE_CLASS_TEXT | TYPE_TEXT_VARIATION_PASSWORD;
+		passwordEntry.setInputType(inputType);
+		layout.addView(passwordEntry);
+
+		TextView confirmPassword = new TextView(this);
+		confirmPassword.setGravity(CENTER);
+		confirmPassword.setTextSize(18);
+		confirmPassword.setPadding(10, 10, 10, 0);
+		confirmPassword.setText(R.string.confirm_password);
+		layout.addView(confirmPassword);
+
+		passwordConfirmation = new EditText(this) {
+			@Override
+			protected void onTextChanged(CharSequence text, int start,
+					int lengthBefore, int lengthAfter) {
+				enableOrDisableContinueButton();
+			}
+		};
+		passwordConfirmation.setId(3);
+		passwordConfirmation.setMaxLines(1);
+		inputType = TYPE_CLASS_TEXT | TYPE_TEXT_VARIATION_PASSWORD;
+		passwordConfirmation.setInputType(inputType);
+		layout.addView(passwordConfirmation);
+
+		TextView minPasswordLength = new TextView(this);
+		minPasswordLength.setGravity(CENTER);
+		minPasswordLength.setTextSize(14);
+		minPasswordLength.setPadding(10, 10, 10, 10);
+		String format = getResources().getString(R.string.format_min_password);
+		minPasswordLength.setText(String.format(format, MIN_PASSWORD_LENGTH));
+		layout.addView(minPasswordLength);
+
+		continueButton = new Button(this);
+		continueButton.setLayoutParams(WRAP_WRAP);
+		continueButton.setText(R.string.continue_button);
+		continueButton.setEnabled(false);
+		continueButton.setOnClickListener(this);
+		layout.addView(continueButton);
+
+		progress = new ProgressBar(this);
+		progress.setLayoutParams(WRAP_WRAP);
+		progress.setIndeterminate(true);
+		progress.setVisibility(GONE);
+		layout.addView(progress);
+
+		ScrollView scroll = new ScrollView(this);
+		scroll.addView(layout);
+
+		setContentView(scroll);
+	}
+
+	private void enableOrDisableContinueButton() {
+		if(nicknameEntry == null || passwordEntry == null ||
+				passwordConfirmation == null || continueButton == null) return;
+		boolean nicknameNotEmpty = nicknameEntry.getText().length() > 0;
+		char[] firstPassword = getChars(passwordEntry.getText());
+		char[] secondPassword = getChars(passwordConfirmation.getText());
+		boolean passwordLength = firstPassword.length >= MIN_PASSWORD_LENGTH;
+		boolean passwordsMatch = Arrays.equals(firstPassword, secondPassword);
+		for(int i = 0; i < firstPassword.length; i++) firstPassword[i] = 0;
+		for(int i = 0; i < secondPassword.length; i++) secondPassword[i] = 0;
+		boolean valid = nicknameNotEmpty && passwordLength && passwordsMatch;
+		continueButton.setEnabled(valid);
+	}
+
+	private char[] getChars(Editable e) {
+		int length = e.length();
+		char[] c = new char[length];
+		e.getChars(0, length, c, 0);
+		return c;
+	}
+
+	public void onClick(View view) {
+		final String nickname = nicknameEntry.getText().toString();
+		final char[] password = getChars(passwordEntry.getText());
+		delete(passwordEntry.getText());
+		delete(passwordConfirmation.getText());
+		// Replace the button with a progress bar
+		continueButton.setVisibility(GONE);
+		progress.setVisibility(VISIBLE);
+		// Store the DB key and create the identity in a background thread
+		cryptoExecutor.execute(new Runnable() {
+			public void run() {
+				byte[] key = crypto.generateSecretKey().getEncoded();
+				byte[] encrypted = crypto.encryptWithPassword(key, password);
+				storeEncryptedDatabaseKey(encrypted);
+				databaseConfig.setEncryptionKey(key);
+				KeyPair keyPair = crypto.generateSignatureKeyPair();
+				final byte[] publicKey = keyPair.getPublic().getEncoded();
+				final byte[] privateKey = keyPair.getPrivate().getEncoded();
+				LocalAuthor a = authorFactory.createLocalAuthor(nickname,
+						publicKey, privateKey);
+				showHomeScreen(referenceManager.putReference(a,
+						LocalAuthor.class));				
+			}
+		});
+	}
+
+	private void delete(Editable e) {
+		e.delete(0, e.length());
+	}
+
+	private void storeEncryptedDatabaseKey(byte[] encrypted) {
+		SharedPreferences prefs = getSharedPreferences("db", MODE_PRIVATE);
+		Editor editor = prefs.edit();
+		editor.putString("key", StringUtils.toHexString(encrypted));
+		editor.commit();
+	}
+
+	private void showHomeScreen(final long handle) {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				Intent i = new Intent(SetupActivity.this,
+						HomeScreenActivity.class);
+				i.putExtra("org.briarproject.LOCAL_AUTHOR_HANDLE", handle);
+				i.setFlags(FLAG_ACTIVITY_NEW_TASK);
+				startActivity(i);
+				finish();
+			}
+		});
+	}
+}

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

@@ -0,0 +1,46 @@
+package org.briarproject.android;
+
+import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
+import static android.view.Gravity.CENTER;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_MATCH;
+import org.briarproject.api.db.DatabaseConfig;
+import roboguice.RoboGuice;
+import roboguice.activity.RoboSplashActivity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.widget.LinearLayout;
+import android.widget.ProgressBar;
+
+import com.google.inject.Injector;
+
+public class SplashScreenActivity extends RoboSplashActivity {
+
+	public SplashScreenActivity() {
+		minDisplayMs = 0;
+	}
+
+	@Override
+	public void onCreate(Bundle state) {
+		super.onCreate(state);
+		LinearLayout layout = new LinearLayout(this);
+		layout.setLayoutParams(MATCH_MATCH);
+		layout.setGravity(CENTER);
+		ProgressBar spinner = new ProgressBar(this);
+		spinner.setIndeterminate(true);
+		layout.addView(spinner);
+		setContentView(layout);
+	}
+
+	protected void startNextActivity() {
+		Injector guice = RoboGuice.getBaseApplicationInjector(getApplication());
+		if(guice.getInstance(DatabaseConfig.class).databaseExists()) {
+			Intent i = new Intent(this, HomeScreenActivity.class);
+			i.setFlags(FLAG_ACTIVITY_NEW_TASK);
+			startActivity(i);
+		} else {
+			Intent i = new Intent(this, SetupActivity.class);
+			i.setFlags(FLAG_ACTIVITY_NEW_TASK);
+			startActivity(i);
+		}
+	}
+}

briar-android/src/org/briarproject/android/contact/ContactItem.java

@@ -0,0 +1,18 @@
+package org.briarproject.android.contact;
+
+import org.briarproject.api.Contact;
+
+public class ContactItem {
+
+	public static final ContactItem NEW = new ContactItem(null);
+
+	private final Contact contact;
+
+	public ContactItem(Contact contact) {
+		this.contact = contact;
+	}
+
+	public Contact getContact() {
+		return contact;
+	}
+}

briar-android/src/org/briarproject/android/contact/ContactItemComparator.java

@@ -0,0 +1,18 @@
+package org.briarproject.android.contact;
+
+import java.util.Comparator;
+
+public class ContactItemComparator implements Comparator<ContactItem> {
+
+	public static final ContactItemComparator INSTANCE =
+			new ContactItemComparator();
+
+	public int compare(ContactItem a, ContactItem b) {
+		if(a == b) return 0;
+		if(a == ContactItem.NEW) return 1;
+		if(b == ContactItem.NEW) return -1;
+		String aName = a.getContact().getAuthor().getName();
+		String bName = b.getContact().getAuthor().getName();
+		return String.CASE_INSENSITIVE_ORDER.compare(aName, bName);
+	}
+}

briar-android/src/org/briarproject/android/contact/ContactListActivity.java

@@ -0,0 +1,320 @@
+package org.briarproject.android.contact;
+
+import static android.view.Gravity.CENTER_HORIZONTAL;
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
+import static android.widget.LinearLayout.VERTICAL;
+import static java.util.logging.Level.INFO;
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_MATCH;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_WRAP_1;
+
+import java.util.Collection;
+import java.util.Comparator;
+import java.util.Map;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import org.briarproject.R;
+import org.briarproject.android.invitation.AddContactActivity;
+import org.briarproject.android.util.HorizontalBorder;
+import org.briarproject.android.util.ListLoadingProgressBar;
+import org.briarproject.api.AuthorId;
+import org.briarproject.api.Contact;
+import org.briarproject.api.ContactId;
+import org.briarproject.api.android.DatabaseUiExecutor;
+import org.briarproject.api.db.DatabaseComponent;
+import org.briarproject.api.db.DbException;
+import org.briarproject.api.db.MessageHeader;
+import org.briarproject.api.db.NoSuchContactException;
+import org.briarproject.api.event.ContactAddedEvent;
+import org.briarproject.api.event.ContactRemovedEvent;
+import org.briarproject.api.event.Event;
+import org.briarproject.api.event.EventListener;
+import org.briarproject.api.event.MessageAddedEvent;
+import org.briarproject.api.event.MessageExpiredEvent;
+import org.briarproject.api.lifecycle.LifecycleManager;
+import org.briarproject.api.messaging.GroupId;
+import org.briarproject.api.transport.ConnectionListener;
+import org.briarproject.api.transport.ConnectionRegistry;
+import roboguice.activity.RoboActivity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.AdapterView;
+import android.widget.AdapterView.OnItemClickListener;
+import android.widget.ImageButton;
+import android.widget.LinearLayout;
+import android.widget.ListView;
+
+public class ContactListActivity extends RoboActivity
+implements OnClickListener, OnItemClickListener, EventListener,
+ConnectionListener {
+
+	private static final Logger LOG =
+			Logger.getLogger(ContactListActivity.class.getName());
+
+	@Inject private ConnectionRegistry connectionRegistry;
+	private ContactListAdapter adapter = null;
+	private ListView list = null;
+	private ListLoadingProgressBar loading = null;
+	private ImageButton addContactButton = null;
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject private volatile DatabaseComponent db;
+	@Inject @DatabaseUiExecutor private volatile Executor dbUiExecutor;
+	@Inject private volatile LifecycleManager lifecycleManager;
+
+	@Override
+	public void onCreate(Bundle state) {
+		super.onCreate(state);
+		LinearLayout layout = new LinearLayout(this);
+		layout.setLayoutParams(MATCH_MATCH);
+		layout.setOrientation(VERTICAL);
+		layout.setGravity(CENTER_HORIZONTAL);
+
+		adapter = new ContactListAdapter(this);
+		list = new ListView(this);
+		// Give me all the width and all the unused height
+		list.setLayoutParams(MATCH_WRAP_1);
+		list.setAdapter(adapter);
+		list.setOnItemClickListener(this);
+		layout.addView(list);
+
+		// Show a progress bar while the list is loading
+		list.setVisibility(GONE);
+		loading = new ListLoadingProgressBar(this);
+		layout.addView(loading);
+
+		layout.addView(new HorizontalBorder(this));
+
+		addContactButton = new ImageButton(this);
+		addContactButton.setBackgroundResource(0);
+		addContactButton.setImageResource(R.drawable.social_add_person);
+		addContactButton.setOnClickListener(this);
+		layout.addView(addContactButton);
+
+		setContentView(layout);
+	}
+
+	@Override
+	public void onResume() {
+		super.onResume();
+		db.addListener(this);
+		connectionRegistry.addListener(this);
+		loadContacts();
+	}
+
+	private void loadContacts() {
+		clearContacts();
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					Map<ContactId, Long> times = db.getLastConnected();
+					for(Contact c : db.getContacts()) {
+						Long lastConnected = times.get(c.getId());
+						if(lastConnected == null) continue;
+						try {
+							GroupId inbox = db.getInboxGroupId(c.getId());
+							Collection<MessageHeader> headers =
+									db.getInboxMessageHeaders(c.getId());
+							displayContact(c, lastConnected, inbox, headers);
+						} catch(NoSuchContactException e) {
+							if(LOG.isLoggable(INFO))
+								LOG.info("Contact removed");
+						}
+					}
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Full load took " + duration + " ms");
+					hideProgressBar();
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+			}
+		});
+	}
+
+	private void clearContacts() {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				list.setVisibility(GONE);
+				loading.setVisibility(VISIBLE);
+				adapter.clear();
+				adapter.notifyDataSetChanged();
+			}
+		});
+	}
+
+	private void displayContact(final Contact c, final long lastConnected,
+			final GroupId inbox, final Collection<MessageHeader> headers) {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				list.setVisibility(VISIBLE);
+				loading.setVisibility(GONE);
+				boolean connected = connectionRegistry.isConnected(c.getId());
+				// Remove the old item, if any
+				ContactListItem item = findItem(c.getId());
+				if(item != null) adapter.remove(item);
+				// Add a new item
+				adapter.add(new ContactListItem(c, connected, lastConnected,
+						inbox, headers));
+				adapter.sort(ItemComparator.INSTANCE);
+				adapter.notifyDataSetChanged();
+			}
+		});
+	}
+
+	private void hideProgressBar() {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				list.setVisibility(VISIBLE);
+				loading.setVisibility(GONE);
+			}
+		});
+	}
+
+	private ContactListItem findItem(ContactId c) {
+		int count = adapter.getCount();
+		for(int i = 0; i < count; i++) {
+			ContactListItem item = adapter.getItem(i);
+			if(item.getContact().getId().equals(c)) return item;
+		}
+		return null; // Not found
+	}
+
+	@Override
+	public void onPause() {
+		super.onPause();
+		db.removeListener(this);
+		connectionRegistry.removeListener(this);
+	}
+
+	public void onClick(View view) {
+		startActivity(new Intent(this, AddContactActivity.class));
+	}
+
+	public void onItemClick(AdapterView<?> parent, View view, int position,
+			long id) {
+		ContactListItem item = adapter.getItem(position);
+		ContactId contactId = item.getContact().getId();
+		String contactName = item.getContact().getAuthor().getName();
+		GroupId inbox = item.getInboxGroupId();
+		AuthorId localAuthorId = item.getContact().getLocalAuthorId();
+		Intent i = new Intent(this, ConversationActivity.class);
+		i.putExtra("org.briarproject.CONTACT_ID", contactId.getInt());
+		i.putExtra("org.briarproject.CONTACT_NAME", contactName);
+		i.putExtra("org.briarproject.GROUP_ID", inbox.getBytes());
+		i.putExtra("org.briarproject.LOCAL_AUTHOR_ID", localAuthorId.getBytes());
+		startActivity(i);
+	}
+
+	public void eventOccurred(Event e) {
+		if(e instanceof ContactAddedEvent) {
+			loadContacts();
+		} else if(e instanceof ContactRemovedEvent) {
+			// Reload the conversation, expecting NoSuchContactException
+			if(LOG.isLoggable(INFO)) LOG.info("Contact removed, reloading");
+			reloadContact(((ContactRemovedEvent) e).getContactId());
+		} else if(e instanceof MessageAddedEvent) {
+			if(LOG.isLoggable(INFO)) LOG.info("Message added, reloading");
+			ContactId source = ((MessageAddedEvent) e).getContactId();
+			if(source == null) loadContacts();
+			else reloadContact(source);
+		} else if(e instanceof MessageExpiredEvent) {
+			if(LOG.isLoggable(INFO)) LOG.info("Message expired, reloading");
+			loadContacts();
+		}
+	}
+
+	private void reloadContact(final ContactId c) {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					Collection<MessageHeader> headers =
+							db.getInboxMessageHeaders(c);
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Partial load took " + duration + " ms");
+					updateItem(c, headers);
+				} catch(NoSuchContactException e) {
+					if(LOG.isLoggable(INFO)) LOG.info("Contact removed");
+					removeItem(c);
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+			}
+		});
+	}
+
+	private void updateItem(final ContactId c,
+			final Collection<MessageHeader> headers) {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				ContactListItem item = findItem(c);
+				if(item != null) item.setHeaders(headers);
+			}
+		});
+	}
+
+	private void removeItem(final ContactId c) {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				ContactListItem item = findItem(c);
+				if(item != null) {
+					adapter.remove(item);
+					adapter.notifyDataSetChanged();
+				}
+			}
+		});
+	}
+
+	public void contactConnected(ContactId c) {
+		setConnected(c, true);
+	}
+
+	public void contactDisconnected(ContactId c) {
+		setConnected(c, false);
+	}
+
+	private void setConnected(final ContactId c, final boolean connected) {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				ContactListItem item = findItem(c);
+				if(item == null) return;
+				if(LOG.isLoggable(INFO)) LOG.info("Updating connection time");
+				item.setConnected(connected);
+				item.setLastConnected(System.currentTimeMillis());
+				list.invalidateViews();
+			}
+		});
+	}
+
+	private static class ItemComparator implements Comparator<ContactListItem> {
+
+		private static final ItemComparator INSTANCE = new ItemComparator();
+
+		public int compare(ContactListItem a, ContactListItem b) {
+			String aName = a.getContact().getAuthor().getName();
+			String bName = b.getContact().getAuthor().getName();
+			return String.CASE_INSENSITIVE_ORDER.compare(aName, bName);
+		}
+	}
+}

briar-android/src/org/briarproject/android/contact/ContactListAdapter.java

@@ -0,0 +1,73 @@
+package org.briarproject.android.contact;
+
+import static android.view.Gravity.CENTER_VERTICAL;
+import static android.widget.LinearLayout.HORIZONTAL;
+import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP_1;
+
+import java.util.ArrayList;
+
+import org.briarproject.R;
+import android.content.Context;
+import android.content.res.Resources;
+import android.text.Html;
+import android.text.format.DateUtils;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ArrayAdapter;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+class ContactListAdapter extends ArrayAdapter<ContactListItem> {
+
+	ContactListAdapter(Context ctx) {
+		super(ctx, android.R.layout.simple_expandable_list_item_1,
+				new ArrayList<ContactListItem>());
+	}
+
+	@Override
+	public View getView(int position, View convertView, ViewGroup parent) {
+		ContactListItem item = getItem(position);
+		Context ctx = getContext();
+		LinearLayout layout = new LinearLayout(ctx);
+		layout.setOrientation(HORIZONTAL);
+		layout.setGravity(CENTER_VERTICAL);
+		Resources res = ctx.getResources();
+		if(item.getUnreadCount() > 0)
+			layout.setBackgroundColor(res.getColor(R.color.unread_background));
+
+		ImageView bulb = new ImageView(ctx);
+		bulb.setPadding(5, 5, 5, 5);
+		if(item.isConnected())
+			bulb.setImageResource(R.drawable.contact_connected);
+		else bulb.setImageResource(R.drawable.contact_disconnected);
+		layout.addView(bulb);
+
+		TextView name = new TextView(ctx);
+		// Give me all the unused width
+		name.setLayoutParams(WRAP_WRAP_1);
+		name.setTextSize(18);
+		name.setMaxLines(1);
+		name.setPadding(0, 10, 10, 10);
+		int unread = item.getUnreadCount();
+		String contactName = item.getContact().getAuthor().getName();
+		if(unread > 0) name.setText(contactName + " (" + unread + ")");
+		else name.setText(contactName);
+		layout.addView(name);
+
+		TextView connected = new TextView(ctx);
+		connected.setTextSize(14);
+		connected.setPadding(0, 10, 10, 10);
+		if(item.isConnected()) {
+			connected.setText(R.string.contact_connected);
+		} else {
+			String format = res.getString(R.string.format_last_connected);
+			long then = item.getLastConnected();
+			CharSequence ago = DateUtils.getRelativeTimeSpanString(then);
+			connected.setText(Html.fromHtml(String.format(format, ago)));
+		}
+		layout.addView(connected);
+
+		return layout;
+	}
+}

briar-android/src/org/briarproject/android/contact/ContactListItem.java

@@ -0,0 +1,76 @@
+package org.briarproject.android.contact;
+
+import java.util.Collection;
+
+import org.briarproject.api.Contact;
+import org.briarproject.api.db.MessageHeader;
+import org.briarproject.api.messaging.GroupId;
+
+// This class is not thread-safe
+class ContactListItem {
+
+	private final Contact contact;
+	private final GroupId inbox;
+	private boolean connected;
+	private long lastConnected;
+	private boolean empty;
+	private long timestamp;
+	private int unread;
+
+	ContactListItem(Contact contact, boolean connected, long lastConnected,
+			GroupId inbox, Collection<MessageHeader> headers) {
+		this.contact = contact;
+		this.inbox = inbox;
+		this.connected = connected;
+		this.lastConnected = lastConnected;
+		setHeaders(headers);
+	}
+
+	void setHeaders(Collection<MessageHeader> headers) {
+		empty = headers.isEmpty();
+		timestamp = 0;
+		unread = 0;
+		if(!empty) {
+			for(MessageHeader h : headers) {
+				if(h.getTimestamp() > timestamp) timestamp = h.getTimestamp();
+				if(!h.isRead()) unread++;
+			}
+		}
+	}
+
+	Contact getContact() {
+		return contact;
+	}
+
+	GroupId getInboxGroupId() {
+		return inbox;
+	}
+
+	long getLastConnected() {
+		return lastConnected;
+	}
+
+	void setLastConnected(long lastConnected) {
+		this.lastConnected = lastConnected;
+	}
+
+	boolean isConnected() {
+		return connected;
+	}
+
+	void setConnected(boolean connected) {
+		this.connected = connected;
+	}
+
+	boolean isEmpty() {
+		return empty;
+	}
+
+	long getTimestamp() {
+		return timestamp;
+	}
+
+	int getUnreadCount() {
+		return unread;
+	}
+}

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

@@ -0,0 +1,248 @@
+package org.briarproject.android.contact;
+
+import static android.view.Gravity.CENTER_HORIZONTAL;
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
+import static android.widget.LinearLayout.VERTICAL;
+import static java.util.logging.Level.INFO;
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_MATCH;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_WRAP_1;
+
+import java.util.Collection;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import org.briarproject.R;
+import org.briarproject.android.util.HorizontalBorder;
+import org.briarproject.android.util.ListLoadingProgressBar;
+import org.briarproject.api.AuthorId;
+import org.briarproject.api.ContactId;
+import org.briarproject.api.android.DatabaseUiExecutor;
+import org.briarproject.api.db.DatabaseComponent;
+import org.briarproject.api.db.DbException;
+import org.briarproject.api.db.MessageHeader;
+import org.briarproject.api.db.NoSuchContactException;
+import org.briarproject.api.event.ContactRemovedEvent;
+import org.briarproject.api.event.Event;
+import org.briarproject.api.event.EventListener;
+import org.briarproject.api.event.MessageAddedEvent;
+import org.briarproject.api.event.MessageExpiredEvent;
+import org.briarproject.api.lifecycle.LifecycleManager;
+import org.briarproject.api.messaging.GroupId;
+import roboguice.activity.RoboActivity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.AdapterView;
+import android.widget.AdapterView.OnItemClickListener;
+import android.widget.ImageButton;
+import android.widget.LinearLayout;
+import android.widget.ListView;
+
+public class ConversationActivity extends RoboActivity
+implements EventListener, OnClickListener, OnItemClickListener {
+
+	private static final Logger LOG =
+			Logger.getLogger(ConversationActivity.class.getName());
+
+	private String contactName = null;
+	private ConversationAdapter adapter = null;
+	private ListView list = null;
+	private ListLoadingProgressBar loading = null;
+	private ImageButton composeButton = null;
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject private volatile DatabaseComponent db;
+	@Inject @DatabaseUiExecutor private volatile Executor dbUiExecutor;
+	@Inject private volatile LifecycleManager lifecycleManager;
+	private volatile ContactId contactId = null;
+	private volatile GroupId groupId = null;
+	private volatile AuthorId localAuthorId = null;
+
+	@Override
+	public void onCreate(Bundle state) {
+		super.onCreate(state);
+
+		Intent i = getIntent();
+		int id = i.getIntExtra("org.briarproject.CONTACT_ID", -1);
+		if(id == -1) throw new IllegalStateException();
+		contactId = new ContactId(id);
+		contactName = i.getStringExtra("org.briarproject.CONTACT_NAME");
+		if(contactName == null) throw new IllegalStateException();
+		setTitle(contactName);
+		byte[] b = i.getByteArrayExtra("org.briarproject.GROUP_ID");
+		if(b == null) throw new IllegalStateException();
+		groupId = new GroupId(b);
+		b = i.getByteArrayExtra("org.briarproject.LOCAL_AUTHOR_ID");
+		if(b == null) throw new IllegalStateException();
+		localAuthorId = new AuthorId(b);
+
+		LinearLayout layout = new LinearLayout(this);
+		layout.setLayoutParams(MATCH_MATCH);
+		layout.setOrientation(VERTICAL);
+		layout.setGravity(CENTER_HORIZONTAL);
+
+		adapter = new ConversationAdapter(this);
+		list = new ListView(this);
+		// Give me all the width and all the unused height
+		list.setLayoutParams(MATCH_WRAP_1);
+		list.setAdapter(adapter);
+		list.setOnItemClickListener(this);
+		layout.addView(list);
+
+		// Show a progress bar while the list is loading
+		list.setVisibility(GONE);
+		loading = new ListLoadingProgressBar(this);
+		layout.addView(loading);
+
+		layout.addView(new HorizontalBorder(this));
+
+		composeButton = new ImageButton(this);
+		composeButton.setBackgroundResource(0);
+		composeButton.setImageResource(R.drawable.content_new_email);
+		composeButton.setEnabled(false); // Enabled after loading the headers
+		composeButton.setOnClickListener(this);
+		layout.addView(composeButton);
+
+		setContentView(layout);
+	}
+
+	@Override
+	public void onResume() {
+		super.onResume();
+		db.addListener(this);
+		loadHeaders();
+	}
+
+	private void loadHeaders() {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					Collection<MessageHeader> headers =
+							db.getInboxMessageHeaders(contactId);
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Load took " + duration + " ms");
+					displayHeaders(headers);
+				} catch(NoSuchContactException e) {
+					if(LOG.isLoggable(INFO)) LOG.info("Contact removed");
+					runOnUiThread(new Runnable() {
+						public void run() {
+							finish();
+						}
+					});
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+			}
+		});
+	}
+
+	private void displayHeaders(final Collection<MessageHeader> headers) {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				list.setVisibility(VISIBLE);
+				loading.setVisibility(GONE);
+				composeButton.setEnabled(true);
+				adapter.clear();
+				for(MessageHeader h : headers)
+					adapter.add(new ConversationItem(h));
+				adapter.sort(ConversationItemComparator.INSTANCE);
+				adapter.notifyDataSetChanged();
+				selectFirstUnread();
+			}
+		});
+	}
+
+	private void selectFirstUnread() {
+		int firstUnread = -1, count = adapter.getCount();
+		for(int i = 0; i < count; i++) {
+			if(!adapter.getItem(i).getHeader().isRead()) {
+				firstUnread = i;
+				break;
+			}
+		}
+		if(firstUnread == -1) list.setSelection(count - 1);
+		else list.setSelection(firstUnread);
+	}
+
+	@Override
+	public void onActivityResult(int request, int result, Intent data) {
+		if(result == ReadPrivateMessageActivity.RESULT_PREV) {
+			int position = request - 1;
+			if(position >= 0 && position < adapter.getCount())
+				displayMessage(position);
+		} else if(result == ReadPrivateMessageActivity.RESULT_NEXT) {
+			int position = request + 1;
+			if(position >= 0 && position < adapter.getCount())
+				displayMessage(position);
+		}
+	}
+
+	@Override
+	public void onPause() {
+		super.onPause();
+		db.removeListener(this);
+	}
+
+	public void eventOccurred(Event e) {
+		if(e instanceof ContactRemovedEvent) {
+			ContactRemovedEvent c = (ContactRemovedEvent) e;
+			if(c.getContactId().equals(contactId)) {
+				if(LOG.isLoggable(INFO)) LOG.info("Contact removed");
+				runOnUiThread(new Runnable() {
+					public void run() {
+						finish();
+					}
+				});
+			}
+		} else if(e instanceof MessageAddedEvent) {
+			GroupId g = ((MessageAddedEvent) e).getGroup().getId();
+			if(g.equals(groupId)) {
+				if(LOG.isLoggable(INFO)) LOG.info("Message added, reloading");
+				loadHeaders();
+			}
+		} else if(e instanceof MessageExpiredEvent) {
+			if(LOG.isLoggable(INFO)) LOG.info("Message expired, reloading");
+			loadHeaders();
+		}
+	}
+
+	public void onClick(View view) {
+		Intent i = new Intent(this, WritePrivateMessageActivity.class);
+		i.putExtra("org.briarproject.CONTACT_NAME", contactName);
+		i.putExtra("org.briarproject.GROUP_ID", groupId.getBytes());
+		i.putExtra("org.briarproject.LOCAL_AUTHOR_ID", localAuthorId.getBytes());
+		startActivity(i);
+	}
+
+	public void onItemClick(AdapterView<?> parent, View view, int position,
+			long id) {
+		displayMessage(position);
+	}
+
+	private void displayMessage(int position) {
+		MessageHeader header = adapter.getItem(position).getHeader();
+		Intent i = new Intent(this, ReadPrivateMessageActivity.class);
+		i.putExtra("org.briarproject.CONTACT_ID", contactId.getInt());
+		i.putExtra("org.briarproject.CONTACT_NAME", contactName);
+		i.putExtra("org.briarproject.GROUP_ID", groupId.getBytes());
+		i.putExtra("org.briarproject.LOCAL_AUTHOR_ID", localAuthorId.getBytes());
+		i.putExtra("org.briarproject.AUTHOR_NAME", header.getAuthor().getName());
+		i.putExtra("org.briarproject.MESSAGE_ID", header.getId().getBytes());
+		i.putExtra("org.briarproject.CONTENT_TYPE", header.getContentType());
+		i.putExtra("org.briarproject.TIMESTAMP", header.getTimestamp());
+		startActivityForResult(i, position);
+	}
+}

briar-android/src/org/briarproject/android/contact/ConversationAdapter.java

@@ -0,0 +1,57 @@
+package org.briarproject.android.contact;
+
+import static android.widget.LinearLayout.HORIZONTAL;
+import static java.text.DateFormat.SHORT;
+import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP_1;
+
+import java.util.ArrayList;
+
+import org.briarproject.R;
+import org.briarproject.api.db.MessageHeader;
+import android.content.Context;
+import android.content.res.Resources;
+import android.text.format.DateUtils;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ArrayAdapter;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+class ConversationAdapter extends ArrayAdapter<ConversationItem> {
+
+	ConversationAdapter(Context ctx) {
+		super(ctx, android.R.layout.simple_expandable_list_item_1,
+				new ArrayList<ConversationItem>());
+	}
+
+	@Override
+	public View getView(int position, View convertView, ViewGroup parent) {
+		MessageHeader header = getItem(position).getHeader();
+		Context ctx = getContext();
+
+		LinearLayout layout = new LinearLayout(ctx);
+		layout.setOrientation(HORIZONTAL);
+		if(!header.isRead()) {
+			Resources res = ctx.getResources();
+			layout.setBackgroundColor(res.getColor(R.color.unread_background));
+		}
+
+		TextView name = new TextView(ctx);
+		// Give me all the unused width
+		name.setLayoutParams(WRAP_WRAP_1);
+		name.setTextSize(18);
+		name.setMaxLines(1);
+		name.setPadding(10, 10, 10, 10);
+		name.setText(header.getAuthor().getName());
+		layout.addView(name);
+
+		TextView date = new TextView(ctx);
+		date.setTextSize(14);
+		date.setPadding(0, 10, 10, 10);
+		long then = header.getTimestamp(), now = System.currentTimeMillis();
+		date.setText(DateUtils.formatSameDayTime(then, now, SHORT, SHORT));
+		layout.addView(date);
+
+		return layout;
+	}
+}

briar-android/src/org/briarproject/android/contact/ConversationItem.java

@@ -0,0 +1,37 @@
+package org.briarproject.android.contact;
+
+import org.briarproject.api.db.MessageHeader;
+
+// This class is not thread-safe
+class ConversationItem {
+
+	private final MessageHeader header;
+	private boolean expanded;
+	private byte[] body;
+
+	ConversationItem(MessageHeader header) {
+		this.header = header;
+		expanded = false;
+		body = null;
+	}
+
+	MessageHeader getHeader() {
+		return header;
+	}
+
+	boolean isExpanded() {
+		return expanded;
+	}
+
+	void setExpanded(boolean expanded) {
+		this.expanded = expanded;
+	}
+
+	byte[] getBody() {
+		return body;
+	}
+
+	void setBody(byte[] body) {
+		this.body = body;
+	}
+}

briar-android/src/org/briarproject/android/contact/ConversationItemComparator.java

@@ -0,0 +1,19 @@
+package org.briarproject.android.contact;
+
+import java.util.Comparator;
+
+public class ConversationItemComparator
+implements Comparator<ConversationItem> {
+
+	public static final ConversationItemComparator INSTANCE =
+			new ConversationItemComparator();
+
+	public int compare(ConversationItem a, ConversationItem b) {
+		// The oldest message comes first
+		long aTime = a.getHeader().getTimestamp();
+		long bTime = b.getHeader().getTimestamp();
+		if(aTime < bTime) return -1;
+		if(aTime > bTime) return 1;
+		return 0;
+	}
+}

briar-android/src/org/briarproject/android/contact/ReadPrivateMessageActivity.java

@@ -0,0 +1,281 @@
+package org.briarproject.android.contact;
+
+import static android.view.Gravity.CENTER;
+import static android.view.Gravity.CENTER_VERTICAL;
+import static android.widget.LinearLayout.HORIZONTAL;
+import static android.widget.LinearLayout.VERTICAL;
+import static java.text.DateFormat.SHORT;
+import static java.util.logging.Level.INFO;
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_WRAP;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_WRAP_1;
+import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP_1;
+
+import java.io.UnsupportedEncodingException;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import org.briarproject.R;
+import org.briarproject.android.util.HorizontalBorder;
+import org.briarproject.android.util.HorizontalSpace;
+import org.briarproject.api.AuthorId;
+import org.briarproject.api.android.DatabaseUiExecutor;
+import org.briarproject.api.db.DatabaseComponent;
+import org.briarproject.api.db.DbException;
+import org.briarproject.api.db.NoSuchMessageException;
+import org.briarproject.api.lifecycle.LifecycleManager;
+import org.briarproject.api.messaging.GroupId;
+import org.briarproject.api.messaging.MessageId;
+import roboguice.activity.RoboActivity;
+import android.content.Intent;
+import android.content.res.Resources;
+import android.os.Bundle;
+import android.text.format.DateUtils;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.ImageButton;
+import android.widget.LinearLayout;
+import android.widget.ScrollView;
+import android.widget.TextView;
+
+public class ReadPrivateMessageActivity extends RoboActivity
+implements OnClickListener {
+
+	static final int RESULT_REPLY = RESULT_FIRST_USER;
+	static final int RESULT_PREV = RESULT_FIRST_USER + 1;
+	static final int RESULT_NEXT = RESULT_FIRST_USER + 2;
+
+	private static final Logger LOG =
+			Logger.getLogger(ReadPrivateMessageActivity.class.getName());
+
+	private String contactName = null;
+	private AuthorId localAuthorId = null;
+	private boolean read = false;
+	private ImageButton readButton = null, prevButton = null, nextButton = null;
+	private ImageButton replyButton = null;
+	private TextView content = null;
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject private volatile DatabaseComponent db;
+	@Inject @DatabaseUiExecutor private volatile Executor dbUiExecutor;
+	@Inject private volatile LifecycleManager lifecycleManager;
+	private volatile MessageId messageId = null;
+	private volatile GroupId groupId = null;
+	private volatile long timestamp = -1;
+
+	@Override
+	public void onCreate(Bundle state) {
+		super.onCreate(state);
+
+		Intent i = getIntent();
+		contactName = i.getStringExtra("org.briarproject.CONTACT_NAME");
+		if(contactName == null) throw new IllegalStateException();
+		setTitle(contactName);
+		byte[] b = i.getByteArrayExtra("org.briarproject.LOCAL_AUTHOR_ID");
+		if(b == null) throw new IllegalStateException();
+		localAuthorId = new AuthorId(b);
+		String authorName = i.getStringExtra("org.briarproject.AUTHOR_NAME");
+		if(authorName == null) throw new IllegalStateException();
+		b = i.getByteArrayExtra("org.briarproject.MESSAGE_ID");
+		if(b == null) throw new IllegalStateException();
+		messageId = new MessageId(b);
+		b = i.getByteArrayExtra("org.briarproject.GROUP_ID");
+		if(b == null) throw new IllegalStateException();
+		groupId = new GroupId(b);
+		String contentType = i.getStringExtra("org.briarproject.CONTENT_TYPE");
+		if(contentType == null) throw new IllegalStateException();
+		timestamp = i.getLongExtra("org.briarproject.TIMESTAMP", -1);
+		if(timestamp == -1) throw new IllegalStateException();
+
+		if(state == null) {
+			read = false;
+			setReadInDatabase(true);
+		} else {
+			read = state.getBoolean("org.briarproject.READ");
+		}
+
+		LinearLayout layout = new LinearLayout(this);
+		layout.setLayoutParams(MATCH_WRAP);
+		layout.setOrientation(VERTICAL);
+
+		ScrollView scrollView = new ScrollView(this);
+		// Give me all the width and all the unused height
+		scrollView.setLayoutParams(MATCH_WRAP_1);
+
+		LinearLayout message = new LinearLayout(this);
+		message.setOrientation(VERTICAL);
+		Resources res = getResources();
+		message.setBackgroundColor(res.getColor(R.color.content_background));
+
+		LinearLayout header = new LinearLayout(this);
+		header.setLayoutParams(MATCH_WRAP);
+		header.setOrientation(HORIZONTAL);
+		header.setGravity(CENTER_VERTICAL);
+
+		TextView name = new TextView(this);
+		// Give me all the unused width
+		name.setLayoutParams(WRAP_WRAP_1);
+		name.setTextSize(18);
+		name.setMaxLines(1);
+		name.setPadding(10, 10, 10, 10);
+		name.setText(authorName);
+		header.addView(name);
+
+		TextView date = new TextView(this);
+		date.setTextSize(14);
+		date.setPadding(0, 10, 10, 10);
+		long now = System.currentTimeMillis();
+		date.setText(DateUtils.formatSameDayTime(timestamp, now, SHORT, SHORT));
+		header.addView(date);
+		message.addView(header);
+
+		if(contentType.equals("text/plain")) {
+			// Load and display the message body
+			content = new TextView(this);
+			content.setPadding(10, 0, 10, 10);
+			message.addView(content);
+			loadMessageBody();
+		}
+		scrollView.addView(message);
+		layout.addView(scrollView);
+
+		layout.addView(new HorizontalBorder(this));
+
+		LinearLayout footer = new LinearLayout(this);
+		footer.setLayoutParams(MATCH_WRAP);
+		footer.setOrientation(HORIZONTAL);
+		footer.setGravity(CENTER);
+
+		readButton = new ImageButton(this);
+		readButton.setBackgroundResource(0);
+		if(read) readButton.setImageResource(R.drawable.content_unread);
+		else readButton.setImageResource(R.drawable.content_read);
+		readButton.setOnClickListener(this);
+		footer.addView(readButton);
+		footer.addView(new HorizontalSpace(this));
+
+		prevButton = new ImageButton(this);
+		prevButton.setBackgroundResource(0);
+		prevButton.setImageResource(R.drawable.navigation_previous_item);
+		prevButton.setOnClickListener(this);
+		footer.addView(prevButton);
+		footer.addView(new HorizontalSpace(this));
+
+		nextButton = new ImageButton(this);
+		nextButton.setBackgroundResource(0);
+		nextButton.setImageResource(R.drawable.navigation_next_item);
+		nextButton.setOnClickListener(this);
+		footer.addView(nextButton);
+		footer.addView(new HorizontalSpace(this));
+
+		replyButton = new ImageButton(this);
+		replyButton.setBackgroundResource(0);
+		replyButton.setImageResource(R.drawable.social_reply);
+		replyButton.setOnClickListener(this);
+		footer.addView(replyButton);
+		layout.addView(footer);
+
+		setContentView(layout);
+	}
+
+	private void setReadInDatabase(final boolean read) {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					db.setReadFlag(messageId, read);
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Setting flag took " + duration + " ms");
+					setReadInUi(read);
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+			}
+		});
+	}
+
+	private void setReadInUi(final boolean read) {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				ReadPrivateMessageActivity.this.read = read;
+				if(read) readButton.setImageResource(R.drawable.content_unread);
+				else readButton.setImageResource(R.drawable.content_read);
+			}
+		});
+	}
+
+	private void loadMessageBody() {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					byte[] body = db.getMessageBody(messageId);
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Loading message took " + duration + " ms");
+					final String text = new String(body, "UTF-8");
+					runOnUiThread(new Runnable() {
+						public void run() {
+							content.setText(text);
+						}
+					});
+				} catch(NoSuchMessageException e) {
+					if(LOG.isLoggable(INFO)) LOG.info("Message removed");
+					runOnUiThread(new Runnable() {
+						public void run() {
+							finish();
+						}
+					});
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				} catch(UnsupportedEncodingException e) {
+					throw new RuntimeException(e);
+				}
+			}
+		});
+	}
+
+	@Override
+	public void onSaveInstanceState(Bundle state) {
+		super.onSaveInstanceState(state);
+		state.putBoolean("org.briarproject.READ", read);
+	}
+
+	public void onClick(View view) {
+		if(view == readButton) {
+			setReadInDatabase(!read);
+		} else if(view == prevButton) {
+			setResult(RESULT_PREV);
+			finish();
+		} else if(view == nextButton) {
+			setResult(RESULT_NEXT);
+			finish();
+		} else if(view == replyButton) {
+			Intent i = new Intent(this, WritePrivateMessageActivity.class);
+			i.putExtra("org.briarproject.CONTACT_NAME", contactName);
+			i.putExtra("org.briarproject.GROUP_ID", groupId.getBytes());
+			i.putExtra("org.briarproject.LOCAL_AUTHOR_ID",
+					localAuthorId.getBytes());
+			i.putExtra("org.briarproject.PARENT_ID", messageId.getBytes());
+			i.putExtra("org.briarproject.TIMESTAMP", timestamp);
+			startActivity(i);
+			setResult(RESULT_REPLY);
+			finish();
+		}
+	}
+}

briar-android/src/org/briarproject/android/contact/SelectContactsDialog.java

@@ -0,0 +1,65 @@
+package org.briarproject.android.contact;
+
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.briarproject.R;
+import org.briarproject.api.Contact;
+import org.briarproject.api.ContactId;
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.content.DialogInterface;
+import android.os.Bundle;
+import android.support.v4.app.DialogFragment;
+
+public class SelectContactsDialog extends DialogFragment
+implements DialogInterface.OnMultiChoiceClickListener {
+
+	private final Set<ContactId> selected = new HashSet<ContactId>();
+
+	private Listener listener = null;
+	private Contact[] contacts = null;
+
+	public void setListener(Listener listener) {
+		this.listener = listener;
+	}
+
+	public void setContacts(Collection<Contact> contacts) {
+		this.contacts = contacts.toArray(new Contact[contacts.size()]);
+	}
+
+	@Override
+	public Dialog onCreateDialog(Bundle state) {
+		AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+		String[] names = new String[contacts.length];
+		for(int i = 0; i < contacts.length; i++)
+			names[i] = contacts[i].getAuthor().getName();
+		builder.setMultiChoiceItems(names, new boolean[contacts.length], this);
+		builder.setPositiveButton(R.string.done_button,
+				new DialogInterface.OnClickListener() {
+			public void onClick(DialogInterface dialog, int id) {
+				listener.contactsSelected(selected);
+			}
+		});
+		builder.setNegativeButton(R.string.cancel_button,
+				new DialogInterface.OnClickListener() {
+			public void onClick(DialogInterface dialog, int id) {
+				listener.contactSelectionCancelled();
+			}
+		});
+		return builder.create();
+	}
+
+	public void onClick(DialogInterface dialog, int which, boolean isChecked) {
+		if(isChecked) selected.add(contacts[which].getId());
+		else selected.remove(contacts[which].getId());
+	}
+
+	public interface Listener {
+
+		void contactsSelected(Collection<ContactId> selected);
+
+		void contactSelectionCancelled();
+	}
+}

briar-android/src/org/briarproject/android/contact/WritePrivateMessageActivity.java

@@ -0,0 +1,230 @@
+package org.briarproject.android.contact;
+
+import static android.text.InputType.TYPE_CLASS_TEXT;
+import static android.text.InputType.TYPE_TEXT_FLAG_CAP_SENTENCES;
+import static android.view.Gravity.CENTER_VERTICAL;
+import static android.widget.LinearLayout.HORIZONTAL;
+import static android.widget.LinearLayout.VERTICAL;
+import static android.widget.Toast.LENGTH_LONG;
+import static java.util.logging.Level.INFO;
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_WRAP;
+
+import java.io.IOException;
+import java.io.UnsupportedEncodingException;
+import java.security.GeneralSecurityException;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import org.briarproject.R;
+import org.briarproject.android.util.HorizontalSpace;
+import org.briarproject.api.AuthorId;
+import org.briarproject.api.LocalAuthor;
+import org.briarproject.api.android.DatabaseUiExecutor;
+import org.briarproject.api.crypto.CryptoExecutor;
+import org.briarproject.api.db.DatabaseComponent;
+import org.briarproject.api.db.DbException;
+import org.briarproject.api.db.NoSuchContactException;
+import org.briarproject.api.db.NoSuchSubscriptionException;
+import org.briarproject.api.lifecycle.LifecycleManager;
+import org.briarproject.api.messaging.Group;
+import org.briarproject.api.messaging.GroupId;
+import org.briarproject.api.messaging.Message;
+import org.briarproject.api.messaging.MessageFactory;
+import org.briarproject.api.messaging.MessageId;
+import roboguice.activity.RoboActivity;
+import android.content.Intent;
+import android.content.res.Resources;
+import android.os.Bundle;
+import android.text.InputType;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.EditText;
+import android.widget.ImageButton;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+import android.widget.Toast;
+
+public class WritePrivateMessageActivity extends RoboActivity
+implements OnClickListener {
+
+	private static final Logger LOG =
+			Logger.getLogger(WritePrivateMessageActivity.class.getName());
+
+	private TextView from = null, to = null;
+	private ImageButton sendButton = null;
+	private EditText content = null;
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject private volatile DatabaseComponent db;
+	@Inject @DatabaseUiExecutor private volatile Executor dbUiExecutor;
+	@Inject private volatile LifecycleManager lifecycleManager;
+	@Inject @CryptoExecutor private volatile Executor cryptoExecutor;
+	@Inject private volatile MessageFactory messageFactory;
+	private volatile String contactName = null;
+	private volatile GroupId groupId = null;
+	private volatile AuthorId localAuthorId = null;
+	private volatile MessageId parentId = null;
+	private volatile long timestamp = -1;
+	private volatile LocalAuthor localAuthor = null;
+	private volatile Group group = null;
+
+	@Override
+	public void onCreate(Bundle state) {
+		super.onCreate(state);
+
+		Intent i = getIntent();
+		contactName = i.getStringExtra("org.briarproject.CONTACT_NAME");
+		if(contactName == null) throw new IllegalStateException();
+		byte[] b = i.getByteArrayExtra("org.briarproject.GROUP_ID");
+		if(b == null) throw new IllegalStateException();
+		groupId = new GroupId(b);
+		b = i.getByteArrayExtra("org.briarproject.LOCAL_AUTHOR_ID");
+		if(b == null) throw new IllegalStateException();
+		localAuthorId = new AuthorId(b);
+		b = i.getByteArrayExtra("org.briarproject.PARENT_ID");
+		if(b != null) parentId = new MessageId(b);
+		timestamp = i.getLongExtra("org.briarproject.TIMESTAMP", -1);
+
+		LinearLayout layout = new LinearLayout(this);
+		layout.setLayoutParams(MATCH_WRAP);
+		layout.setOrientation(VERTICAL);
+
+		LinearLayout header = new LinearLayout(this);
+		header.setLayoutParams(MATCH_WRAP);
+		header.setOrientation(HORIZONTAL);
+		header.setGravity(CENTER_VERTICAL);
+
+		from = new TextView(this);
+		from.setTextSize(18);
+		from.setPadding(10, 10, 10, 10);
+		from.setText(R.string.from);
+		header.addView(from);
+
+		header.addView(new HorizontalSpace(this));
+
+		sendButton = new ImageButton(this);
+		sendButton.setBackgroundResource(0);
+		sendButton.setImageResource(R.drawable.social_send_now);
+		sendButton.setEnabled(false); // Enabled after loading the group
+		sendButton.setOnClickListener(this);
+		header.addView(sendButton);
+		layout.addView(header);
+
+		to = new TextView(this);
+		to.setTextSize(18);
+		to.setPadding(10, 0, 10, 10);
+		String format = getResources().getString(R.string.format_to);
+		to.setText(String.format(format, contactName));
+		layout.addView(to);
+
+		content = new EditText(this);
+		content.setId(1);
+		int inputType = TYPE_CLASS_TEXT | InputType.TYPE_TEXT_FLAG_MULTI_LINE
+				| TYPE_TEXT_FLAG_CAP_SENTENCES;
+		content.setInputType(inputType);
+		layout.addView(content);
+
+		setContentView(layout);
+	}
+
+	@Override
+	public void onResume() {
+		super.onResume();
+		loadAuthorAndGroup();
+	}
+
+	private void loadAuthorAndGroup() {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					localAuthor = db.getLocalAuthor(localAuthorId);
+					group = db.getGroup(groupId);
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Load took " + duration + " ms");
+					displayLocalAuthor();
+				} catch(NoSuchContactException e) {
+					finish();
+				} catch(NoSuchSubscriptionException e) {
+					finish();
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+			}
+		});
+	}
+
+	private void displayLocalAuthor() {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				Resources res = getResources();
+				String format = res.getString(R.string.format_from);
+				String name = localAuthor.getName();
+				from.setText(String.format(format, name));
+				sendButton.setEnabled(true);
+			}
+		});
+	}
+
+	public void onClick(View view) {
+		if(localAuthor == null) throw new IllegalStateException();
+		try {
+			createMessage(content.getText().toString().getBytes("UTF-8"));
+		} catch(UnsupportedEncodingException e) {
+			throw new RuntimeException(e);
+		}
+		Toast.makeText(this, R.string.message_sent_toast, LENGTH_LONG).show();
+		finish();
+	}
+
+	private void createMessage(final byte[] body) {
+		cryptoExecutor.execute(new Runnable() {
+			public void run() {
+				// Don't use an earlier timestamp than the parent
+				long time = System.currentTimeMillis();
+				time = Math.max(time, timestamp + 1);
+				Message m;
+				try {
+					m = messageFactory.createAnonymousMessage(parentId, group,
+							"text/plain", time, body);
+				} catch(GeneralSecurityException e) {
+					throw new RuntimeException(e);
+				} catch(IOException e) {
+					throw new RuntimeException(e);
+				}
+				storeMessage(m);
+			}
+		});
+	}
+
+	private void storeMessage(final Message m) {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					db.addLocalMessage(m);
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Storing message took " + duration + " ms");
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+			}
+		});
+	}
+}

briar-android/src/org/briarproject/android/groups/ConfigureGroupActivity.java

@@ -0,0 +1,247 @@
+package org.briarproject.android.groups;
+
+import static android.view.Gravity.CENTER_HORIZONTAL;
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
+import static android.widget.LinearLayout.VERTICAL;
+import static java.util.logging.Level.INFO;
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_MATCH;
+import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import org.briarproject.R;
+import org.briarproject.android.contact.SelectContactsDialog;
+import org.briarproject.android.invitation.AddContactActivity;
+import org.briarproject.api.Contact;
+import org.briarproject.api.ContactId;
+import org.briarproject.api.android.DatabaseUiExecutor;
+import org.briarproject.api.db.DatabaseComponent;
+import org.briarproject.api.db.DbException;
+import org.briarproject.api.lifecycle.LifecycleManager;
+import org.briarproject.api.messaging.Group;
+import org.briarproject.api.messaging.GroupId;
+import roboguice.activity.RoboFragmentActivity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.v4.app.Fragment;
+import android.support.v4.app.FragmentManager;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.Button;
+import android.widget.CheckBox;
+import android.widget.LinearLayout;
+import android.widget.ProgressBar;
+import android.widget.RadioButton;
+import android.widget.RadioGroup;
+
+public class ConfigureGroupActivity extends RoboFragmentActivity
+implements OnClickListener, NoContactsDialog.Listener,
+SelectContactsDialog.Listener {
+
+	private static final Logger LOG =
+			Logger.getLogger(ConfigureGroupActivity.class.getName());
+
+	private boolean subscribed = false;
+	private CheckBox subscribeCheckBox = null;
+	private RadioGroup radioGroup = null;
+	private RadioButton visibleToAll = null, visibleToSome = null;
+	private Button doneButton = null;
+	private ProgressBar progress = null;
+	private NoContactsDialog noContactsDialog = null;
+	private SelectContactsDialog selectContactsDialog = null;
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject private volatile DatabaseComponent db;
+	@Inject @DatabaseUiExecutor private volatile Executor dbUiExecutor;
+	@Inject private volatile LifecycleManager lifecycleManager;
+	private volatile Group group = null;
+	private volatile Collection<ContactId> selected = Collections.emptyList();
+
+	@Override
+	public void onCreate(Bundle state) {
+		super.onCreate(state);
+
+		Intent i = getIntent();
+		byte[] b = i.getByteArrayExtra("org.briarproject.GROUP_ID");
+		if(b == null) throw new IllegalStateException();
+		GroupId id = new GroupId(b);
+		String name = i.getStringExtra("org.briarproject.GROUP_NAME");
+		if(name == null) throw new IllegalStateException();
+		setTitle(name);
+		b = i.getByteArrayExtra("org.briarproject.GROUP_SALT");
+		if(b == null) throw new IllegalStateException();
+		group = new Group(id, name, b);
+		subscribed = i.getBooleanExtra("org.briarproject.SUBSCRIBED", false);
+		boolean all = i.getBooleanExtra("org.briarproject.VISIBLE_TO_ALL", false);
+
+		LinearLayout layout = new LinearLayout(this);
+		layout.setLayoutParams(MATCH_MATCH);
+		layout.setOrientation(VERTICAL);
+		layout.setGravity(CENTER_HORIZONTAL);
+
+		subscribeCheckBox = new CheckBox(this);
+		subscribeCheckBox.setId(1);
+		subscribeCheckBox.setText(R.string.subscribe_to_this_forum);
+		subscribeCheckBox.setChecked(subscribed);
+		subscribeCheckBox.setOnClickListener(this);
+		layout.addView(subscribeCheckBox);
+
+		radioGroup = new RadioGroup(this);
+		radioGroup.setOrientation(VERTICAL);
+
+		visibleToAll = new RadioButton(this);
+		visibleToAll.setId(2);
+		visibleToAll.setText(R.string.forum_visible_to_all);
+		visibleToAll.setEnabled(subscribed);
+		visibleToAll.setOnClickListener(this);
+		radioGroup.addView(visibleToAll);
+
+		visibleToSome = new RadioButton(this);
+		visibleToSome.setId(3);
+		visibleToSome.setText(R.string.forum_visible_to_some);
+		visibleToSome.setEnabled(subscribed);
+		visibleToSome.setOnClickListener(this);
+		radioGroup.addView(visibleToSome);
+
+		if(!subscribed || all) radioGroup.check(visibleToAll.getId());
+		else radioGroup.check(visibleToSome.getId());
+		layout.addView(radioGroup);
+
+		doneButton = new Button(this);
+		doneButton.setLayoutParams(WRAP_WRAP);
+		doneButton.setText(R.string.done_button);
+		doneButton.setOnClickListener(this);
+		layout.addView(doneButton);
+
+		progress = new ProgressBar(this);
+		progress.setLayoutParams(WRAP_WRAP);
+		progress.setIndeterminate(true);
+		progress.setVisibility(GONE);
+		layout.addView(progress);
+
+		setContentView(layout);
+
+		FragmentManager fm = getSupportFragmentManager();
+		Fragment f = fm.findFragmentByTag("NoContactsDialog");
+		if(f == null) noContactsDialog = new NoContactsDialog();
+		else noContactsDialog = (NoContactsDialog) f;
+		noContactsDialog.setListener(this);
+
+		f = fm.findFragmentByTag("SelectContactsDialog");
+		if(f == null) selectContactsDialog = new SelectContactsDialog();
+		else selectContactsDialog = (SelectContactsDialog) f;
+		selectContactsDialog.setListener(this);
+	}
+
+	public void onClick(View view) {
+		if(view == subscribeCheckBox) {
+			boolean subscribe = subscribeCheckBox.isChecked();
+			visibleToAll.setEnabled(subscribe);
+			visibleToSome.setEnabled(subscribe);
+		} else if(view == visibleToSome) {
+			loadContacts();
+		} else if(view == doneButton) {
+			boolean subscribe = subscribeCheckBox.isChecked();
+			boolean all = visibleToAll.isChecked();
+			Collection<ContactId> visible =
+					Collections.unmodifiableCollection(selected);
+			// Replace the button with a progress bar
+			doneButton.setVisibility(GONE);
+			progress.setVisibility(VISIBLE);
+			// Update the blog in a background thread
+			if(subscribe || subscribed)
+				updateGroup(subscribe, subscribed, all, visible);
+		}
+	}
+
+	private void loadContacts() {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					Collection<Contact> contacts = db.getContacts();
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Load took " + duration + " ms");
+					displayContacts(contacts);
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+			}
+		});
+	}
+
+	private void displayContacts(final Collection<Contact> contacts) {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				FragmentManager fm = getSupportFragmentManager();
+				if(contacts.isEmpty()) {
+					noContactsDialog.show(fm, "NoContactsDialog");
+				} else {
+					selectContactsDialog.setContacts(contacts);
+					selectContactsDialog.show(fm, "SelectContactsDialog");
+				}
+			}
+		});
+	}
+
+	private void updateGroup(final boolean subscribe,
+			final boolean wasSubscribed, final boolean all,
+			final Collection<ContactId> visible) {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					if(subscribe) {
+						if(!wasSubscribed) db.addGroup(group);
+						db.setVisibleToAll(group.getId(), all);
+						if(!all) db.setVisibility(group.getId(), visible);
+					} else if(wasSubscribed) {
+						db.removeGroup(group);
+					}
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Update took " + duration + " ms");
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+				runOnUiThread(new Runnable() {
+					public void run() {
+						finish();
+					}
+				});
+			}
+		});
+	}
+
+	public void contactCreationSelected() {
+		startActivity(new Intent(this, AddContactActivity.class));
+	}
+
+	public void contactCreationCancelled() {}
+
+	public void contactsSelected(Collection<ContactId> selected) {
+		this.selected = selected;
+	}
+
+	public void contactSelectionCancelled() {}
+}

briar-android/src/org/briarproject/android/groups/CreateGroupActivity.java

@@ -0,0 +1,264 @@
+package org.briarproject.android.groups;
+
+import static android.text.InputType.TYPE_CLASS_TEXT;
+import static android.text.InputType.TYPE_TEXT_FLAG_CAP_SENTENCES;
+import static android.view.Gravity.CENTER;
+import static android.view.Gravity.CENTER_HORIZONTAL;
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
+import static android.view.inputmethod.InputMethodManager.HIDE_IMPLICIT_ONLY;
+import static android.widget.LinearLayout.VERTICAL;
+import static java.util.logging.Level.INFO;
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_MATCH;
+import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import org.briarproject.R;
+import org.briarproject.android.contact.SelectContactsDialog;
+import org.briarproject.android.invitation.AddContactActivity;
+import org.briarproject.api.Contact;
+import org.briarproject.api.ContactId;
+import org.briarproject.api.android.DatabaseUiExecutor;
+import org.briarproject.api.db.DatabaseComponent;
+import org.briarproject.api.db.DbException;
+import org.briarproject.api.lifecycle.LifecycleManager;
+import org.briarproject.api.messaging.Group;
+import org.briarproject.api.messaging.GroupFactory;
+import roboguice.activity.RoboFragmentActivity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.v4.app.Fragment;
+import android.support.v4.app.FragmentManager;
+import android.view.KeyEvent;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.inputmethod.InputMethodManager;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.LinearLayout;
+import android.widget.ProgressBar;
+import android.widget.RadioButton;
+import android.widget.RadioGroup;
+import android.widget.TextView;
+import android.widget.TextView.OnEditorActionListener;
+
+public class CreateGroupActivity extends RoboFragmentActivity
+implements OnEditorActionListener, OnClickListener, NoContactsDialog.Listener,
+SelectContactsDialog.Listener {
+
+	private static final Logger LOG =
+			Logger.getLogger(CreateGroupActivity.class.getName());
+
+	private EditText nameEntry = null;
+	private RadioGroup radioGroup = null;
+	private RadioButton visibleToAll = null, visibleToSome = null;
+	private Button createButton = null;
+	private ProgressBar progress = null;
+	private NoContactsDialog noContactsDialog = null;
+	private SelectContactsDialog selectContactsDialog = null;
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject private volatile GroupFactory groupFactory;
+	@Inject private volatile DatabaseComponent db;
+	@Inject @DatabaseUiExecutor private volatile Executor dbUiExecutor;
+	@Inject private volatile LifecycleManager lifecycleManager;
+	private volatile Collection<ContactId> selected = Collections.emptyList();
+
+	@Override
+	public void onCreate(Bundle state) {
+		super.onCreate(state);
+		LinearLayout layout = new LinearLayout(this);
+		layout.setLayoutParams(MATCH_MATCH);
+		layout.setOrientation(VERTICAL);
+		layout.setGravity(CENTER_HORIZONTAL);
+
+		TextView chooseName = new TextView(this);
+		chooseName.setGravity(CENTER);
+		chooseName.setTextSize(18);
+		chooseName.setPadding(10, 10, 10, 0);
+		chooseName.setText(R.string.choose_forum_name);
+		layout.addView(chooseName);
+
+		nameEntry = new EditText(this) {
+			@Override
+			protected void onTextChanged(CharSequence text, int start,
+					int lengthBefore, int lengthAfter) {
+				enableOrDisableCreateButton();
+			}
+		};
+		nameEntry.setId(1);
+		nameEntry.setMaxLines(1);
+		nameEntry.setInputType(TYPE_CLASS_TEXT | TYPE_TEXT_FLAG_CAP_SENTENCES);
+		nameEntry.setOnEditorActionListener(this);
+		layout.addView(nameEntry);
+
+		radioGroup = new RadioGroup(this);
+		radioGroup.setOrientation(VERTICAL);
+
+		visibleToAll = new RadioButton(this);
+		visibleToAll.setId(2);
+		visibleToAll.setText(R.string.forum_visible_to_all);
+		visibleToAll.setOnClickListener(this);
+		radioGroup.addView(visibleToAll);
+
+		visibleToSome = new RadioButton(this);
+		visibleToSome.setId(3);
+		visibleToSome.setText(R.string.forum_visible_to_some);
+		visibleToSome.setOnClickListener(this);
+		radioGroup.addView(visibleToSome);
+		layout.addView(radioGroup);
+
+		createButton = new Button(this);
+		createButton.setLayoutParams(WRAP_WRAP);
+		createButton.setText(R.string.create_button);
+		createButton.setOnClickListener(this);
+		layout.addView(createButton);
+
+		progress = new ProgressBar(this);
+		progress.setLayoutParams(WRAP_WRAP);
+		progress.setIndeterminate(true);
+		progress.setVisibility(GONE);
+		layout.addView(progress);
+
+		setContentView(layout);
+
+		FragmentManager fm = getSupportFragmentManager();
+		Fragment f = fm.findFragmentByTag("NoContactsDialog");
+		if(f == null) noContactsDialog = new NoContactsDialog();
+		else noContactsDialog = (NoContactsDialog) f;
+		noContactsDialog.setListener(this);
+
+		f = fm.findFragmentByTag("SelectContactsDialog");
+		if(f == null) selectContactsDialog = new SelectContactsDialog();
+		else selectContactsDialog = (SelectContactsDialog) f;
+		selectContactsDialog.setListener(this);
+	}
+
+	private void enableOrDisableCreateButton() {
+		if(nameEntry == null || radioGroup == null || createButton == null)
+			return; // Activity not created yet
+		boolean nameNotEmpty = nameEntry.getText().length() > 0;
+		boolean visibilitySelected = radioGroup.getCheckedRadioButtonId() != -1;
+		createButton.setEnabled(nameNotEmpty && visibilitySelected);
+	}
+
+	public boolean onEditorAction(TextView textView, int actionId, KeyEvent e) {
+		validateName();
+		return true;
+	}
+
+	public void onClick(View view) {
+		if(view == visibleToAll) {
+			enableOrDisableCreateButton();
+		} else if(view == visibleToSome) {
+			loadContacts();
+		} else if(view == createButton) {
+			if(!validateName()) return;
+			final String name = nameEntry.getText().toString();
+			final boolean all = visibleToAll.isChecked();
+			final Collection<ContactId> visible =
+					Collections.unmodifiableCollection(selected);
+			// Replace the button with a progress bar
+			createButton.setVisibility(GONE);
+			progress.setVisibility(VISIBLE);
+			// Create and store the group in a background thread
+			dbUiExecutor.execute(new Runnable() {
+				public void run() {
+					try {
+						lifecycleManager.waitForDatabase();
+						Group g = groupFactory.createGroup(name);
+						long now = System.currentTimeMillis();
+						db.addGroup(g);
+						if(all) db.setVisibleToAll(g.getId(), true);
+						else db.setVisibility(g.getId(), visible);
+						long duration = System.currentTimeMillis() - now;
+						if(LOG.isLoggable(INFO))
+							LOG.info("Storing group took " + duration + " ms");
+					} catch(DbException e) {
+						if(LOG.isLoggable(WARNING))
+							LOG.log(WARNING, e.toString(), e);
+					} catch(InterruptedException e) {
+						if(LOG.isLoggable(INFO))
+							LOG.info("Interrupted while waiting for database");
+						Thread.currentThread().interrupt();
+					}
+					runOnUiThread(new Runnable() {
+						public void run() {
+							finish();
+						}
+					});
+				}
+			});
+		}
+	}
+
+
+	private void loadContacts() {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					Collection<Contact> contacts = db.getContacts();
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Load took " + duration + " ms");
+					displayContacts(contacts);
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+			}
+		});
+	}
+
+	private void displayContacts(final Collection<Contact> contacts) {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				FragmentManager fm = getSupportFragmentManager();
+				if(contacts.isEmpty()) {
+					noContactsDialog.show(fm, "NoContactsDialog");
+				} else {
+					selectContactsDialog.setContacts(contacts);
+					selectContactsDialog.show(fm, "SelectContactsDialog");
+				}
+			}
+		});
+	}
+
+	private boolean validateName() {
+		if(nameEntry.getText().toString().equals("")) return false;
+		// Hide the soft keyboard
+		Object o = getSystemService(INPUT_METHOD_SERVICE);
+		((InputMethodManager) o).toggleSoftInput(HIDE_IMPLICIT_ONLY, 0);
+		return true;
+	}
+
+	public void contactCreationSelected() {
+		startActivity(new Intent(this, AddContactActivity.class));
+	}
+
+	public void contactCreationCancelled() {
+		enableOrDisableCreateButton();
+	}
+
+	public void contactsSelected(Collection<ContactId> selected) {
+		this.selected = selected;
+		enableOrDisableCreateButton();
+	}
+
+	public void contactSelectionCancelled() {
+		enableOrDisableCreateButton();
+	}
+}

briar-android/src/org/briarproject/android/groups/GroupActivity.java

@@ -0,0 +1,237 @@
+package org.briarproject.android.groups;
+
+import static android.view.Gravity.CENTER_HORIZONTAL;
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
+import static android.widget.LinearLayout.VERTICAL;
+import static java.util.logging.Level.INFO;
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.android.groups.ReadGroupPostActivity.RESULT_NEXT;
+import static org.briarproject.android.groups.ReadGroupPostActivity.RESULT_PREV;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_MATCH;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_WRAP_1;
+
+import java.util.Collection;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import org.briarproject.R;
+import org.briarproject.android.AscendingHeaderComparator;
+import org.briarproject.android.util.HorizontalBorder;
+import org.briarproject.android.util.ListLoadingProgressBar;
+import org.briarproject.api.Author;
+import org.briarproject.api.android.DatabaseUiExecutor;
+import org.briarproject.api.db.DatabaseComponent;
+import org.briarproject.api.db.DbException;
+import org.briarproject.api.db.MessageHeader;
+import org.briarproject.api.db.NoSuchSubscriptionException;
+import org.briarproject.api.event.Event;
+import org.briarproject.api.event.EventListener;
+import org.briarproject.api.event.MessageAddedEvent;
+import org.briarproject.api.event.MessageExpiredEvent;
+import org.briarproject.api.event.SubscriptionRemovedEvent;
+import org.briarproject.api.lifecycle.LifecycleManager;
+import org.briarproject.api.messaging.GroupId;
+import roboguice.activity.RoboActivity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.AdapterView;
+import android.widget.AdapterView.OnItemClickListener;
+import android.widget.ImageButton;
+import android.widget.LinearLayout;
+import android.widget.ListView;
+
+public class GroupActivity extends RoboActivity implements EventListener,
+OnClickListener, OnItemClickListener {
+
+	private static final Logger LOG =
+			Logger.getLogger(GroupActivity.class.getName());
+
+	private String groupName = null;
+	private GroupAdapter adapter = null;
+	private ListView list = null;
+	private ListLoadingProgressBar loading = null;
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject private volatile DatabaseComponent db;
+	@Inject @DatabaseUiExecutor private volatile Executor dbUiExecutor;
+	@Inject private volatile LifecycleManager lifecycleManager;
+	private volatile GroupId groupId = null;
+
+	@Override
+	public void onCreate(Bundle state) {
+		super.onCreate(state);
+
+		Intent i = getIntent();
+		byte[] b = i.getByteArrayExtra("org.briarproject.GROUP_ID");
+		if(b == null) throw new IllegalStateException();
+		groupId = new GroupId(b);
+		groupName = i.getStringExtra("org.briarproject.GROUP_NAME");
+		if(groupName == null) throw new IllegalStateException();
+		setTitle(groupName);
+
+		LinearLayout layout = new LinearLayout(this);
+		layout.setLayoutParams(MATCH_MATCH);
+		layout.setOrientation(VERTICAL);
+		layout.setGravity(CENTER_HORIZONTAL);
+
+		adapter = new GroupAdapter(this);
+		list = new ListView(this);
+		// Give me all the width and all the unused height
+		list.setLayoutParams(MATCH_WRAP_1);
+		list.setAdapter(adapter);
+		list.setOnItemClickListener(this);
+		layout.addView(list);
+
+		// Show a progress bar while the list is loading
+		list.setVisibility(GONE);
+		loading = new ListLoadingProgressBar(this);
+		layout.addView(loading);
+
+		layout.addView(new HorizontalBorder(this));
+
+		ImageButton composeButton = new ImageButton(this);
+		composeButton.setBackgroundResource(0);
+		composeButton.setImageResource(R.drawable.content_new_email);
+		composeButton.setOnClickListener(this);
+		layout.addView(composeButton);
+
+		setContentView(layout);
+	}
+
+	@Override
+	public void onResume() {
+		super.onResume();
+		db.addListener(this);
+		loadHeaders();
+	}
+
+	private void loadHeaders() {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					Collection<MessageHeader> headers =
+							db.getMessageHeaders(groupId);
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Load took " + duration + " ms");
+					displayHeaders(headers);
+				} catch(NoSuchSubscriptionException e) {
+					if(LOG.isLoggable(INFO)) LOG.info("Subscription removed");
+					runOnUiThread(new Runnable() {
+						public void run() {
+							finish();
+						}
+					});
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+			}
+		});
+	}
+
+	private void displayHeaders(final Collection<MessageHeader> headers) {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				list.setVisibility(VISIBLE);
+				loading.setVisibility(GONE);
+				adapter.clear();
+				for(MessageHeader h : headers) adapter.add(h);
+				adapter.sort(AscendingHeaderComparator.INSTANCE);
+				adapter.notifyDataSetChanged();
+				selectFirstUnread();
+			}
+		});
+	}
+
+	private void selectFirstUnread() {
+		int firstUnread = -1, count = adapter.getCount();
+		for(int i = 0; i < count; i++) {
+			if(!adapter.getItem(i).isRead()) {
+				firstUnread = i;
+				break;
+			}
+		}
+		if(firstUnread == -1) list.setSelection(count - 1);
+		else list.setSelection(firstUnread);
+	}
+
+	@Override
+	public void onActivityResult(int request, int result, Intent data) {
+		if(result == RESULT_PREV) {
+			int position = request - 1;
+			if(position >= 0 && position < adapter.getCount())
+				displayMessage(position);
+		} else if(result == RESULT_NEXT) {
+			int position = request + 1;
+			if(position >= 0 && position < adapter.getCount())
+				displayMessage(position);
+		}
+	}
+
+	@Override
+	public void onPause() {
+		super.onPause();
+		db.removeListener(this);
+	}
+
+	public void eventOccurred(Event e) {
+		if(e instanceof MessageAddedEvent) {
+			if(((MessageAddedEvent) e).getGroup().getId().equals(groupId)) {
+				if(LOG.isLoggable(INFO)) LOG.info("Message added, reloading");
+				loadHeaders();
+			}
+		} else if(e instanceof MessageExpiredEvent) {
+			if(LOG.isLoggable(INFO)) LOG.info("Message expired, reloading");
+			loadHeaders();
+		} else if(e instanceof SubscriptionRemovedEvent) {
+			SubscriptionRemovedEvent s = (SubscriptionRemovedEvent) e;
+			if(s.getGroup().getId().equals(groupId)) {
+				if(LOG.isLoggable(INFO)) LOG.info("Subscription removed");
+				runOnUiThread(new Runnable() {
+					public void run() {
+						finish();
+					}
+				});
+			}
+		}
+	}
+
+	public void onClick(View view) {
+		Intent i = new Intent(this, WriteGroupPostActivity.class);
+		i.putExtra("org.briarproject.GROUP_ID", groupId.getBytes());
+		startActivity(i);
+	}
+
+	public void onItemClick(AdapterView<?> parent, View view, int position,
+			long id) {
+		displayMessage(position);
+	}
+
+	private void displayMessage(int position) {
+		MessageHeader item = adapter.getItem(position);
+		Intent i = new Intent(this, ReadGroupPostActivity.class);
+		i.putExtra("org.briarproject.GROUP_ID", groupId.getBytes());
+		i.putExtra("org.briarproject.GROUP_NAME", groupName);
+		i.putExtra("org.briarproject.MESSAGE_ID", item.getId().getBytes());
+		Author author = item.getAuthor();
+		if(author != null) {
+			i.putExtra("org.briarproject.AUTHOR_ID", author.getId().getBytes());
+			i.putExtra("org.briarproject.AUTHOR_NAME", author.getName());
+		}
+		i.putExtra("org.briarproject.CONTENT_TYPE", item.getContentType());
+		i.putExtra("org.briarproject.TIMESTAMP", item.getTimestamp());
+		startActivityForResult(i, position);
+	}
+}

briar-android/src/org/briarproject/android/groups/GroupAdapter.java

@@ -0,0 +1,63 @@
+package org.briarproject.android.groups;
+
+import static android.widget.LinearLayout.HORIZONTAL;
+import static java.text.DateFormat.SHORT;
+import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP_1;
+
+import java.util.ArrayList;
+
+import org.briarproject.R;
+import org.briarproject.api.Author;
+import org.briarproject.api.db.MessageHeader;
+import android.content.Context;
+import android.content.res.Resources;
+import android.text.format.DateUtils;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ArrayAdapter;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+class GroupAdapter extends ArrayAdapter<MessageHeader> {
+
+	GroupAdapter(Context ctx) {
+		super(ctx, android.R.layout.simple_expandable_list_item_1,
+				new ArrayList<MessageHeader>());
+	}
+
+	@Override
+	public View getView(int position, View convertView, ViewGroup parent) {
+		MessageHeader item = getItem(position);
+		Context ctx = getContext();
+		Resources res = ctx.getResources();
+
+		LinearLayout layout = new LinearLayout(ctx);
+		layout.setOrientation(HORIZONTAL);
+		if(!item.isRead())
+			layout.setBackgroundColor(res.getColor(R.color.unread_background));
+
+		TextView name = new TextView(ctx);
+		// Give me all the unused width
+		name.setLayoutParams(WRAP_WRAP_1);
+		name.setTextSize(18);
+		name.setMaxLines(1);
+		name.setPadding(10, 10, 10, 10);
+		Author author = item.getAuthor();
+		if(author == null) {
+			name.setTextColor(res.getColor(R.color.anonymous_author));
+			name.setText(R.string.anonymous);
+		} else {
+			name.setText(author.getName());
+		}
+		layout.addView(name);
+
+		TextView date = new TextView(ctx);
+		date.setTextSize(14);
+		date.setPadding(10, 10, 10, 10);
+		long then = item.getTimestamp(), now = System.currentTimeMillis();
+		date.setText(DateUtils.formatSameDayTime(then, now, SHORT, SHORT));
+		layout.addView(date);
+
+		return layout;
+	}
+}

briar-android/src/org/briarproject/android/groups/GroupItem.java

@@ -0,0 +1,18 @@
+package org.briarproject.android.groups;
+
+import org.briarproject.api.messaging.Group;
+
+class GroupItem {
+
+	static final GroupItem NEW = new GroupItem(null);
+
+	private final Group group;
+
+	GroupItem(Group group) {
+		this.group = group;
+	}
+
+	Group getGroup() {
+		return group;
+	}
+}

briar-android/src/org/briarproject/android/groups/GroupItemComparator.java

@@ -0,0 +1,18 @@
+package org.briarproject.android.groups;
+
+import static org.briarproject.android.groups.GroupItem.NEW;
+
+import java.util.Comparator;
+
+class GroupItemComparator implements Comparator<GroupItem> {
+
+	static final GroupItemComparator INSTANCE = new GroupItemComparator();
+
+	public int compare(GroupItem a, GroupItem b) {
+		if(a == b) return 0;
+		if(a == NEW) return 1;
+		if(b == NEW) return -1;
+		String aName = a.getGroup().getName(), bName = b.getGroup().getName();
+		return String.CASE_INSENSITIVE_ORDER.compare(aName, bName);
+	}
+}

briar-android/src/org/briarproject/android/groups/GroupListActivity.java

@@ -0,0 +1,375 @@
+package org.briarproject.android.groups;
+
+import static android.view.Gravity.CENTER;
+import static android.view.Gravity.CENTER_HORIZONTAL;
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
+import static android.widget.LinearLayout.HORIZONTAL;
+import static android.widget.LinearLayout.VERTICAL;
+import static java.util.logging.Level.INFO;
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.android.groups.GroupListItem.MANAGE;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_MATCH;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_WRAP;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_WRAP_1;
+
+import java.util.Collection;
+import java.util.Comparator;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import org.briarproject.R;
+import org.briarproject.android.util.HorizontalBorder;
+import org.briarproject.android.util.HorizontalSpace;
+import org.briarproject.android.util.ListLoadingProgressBar;
+import org.briarproject.api.android.DatabaseUiExecutor;
+import org.briarproject.api.db.DatabaseComponent;
+import org.briarproject.api.db.DbException;
+import org.briarproject.api.db.MessageHeader;
+import org.briarproject.api.db.NoSuchSubscriptionException;
+import org.briarproject.api.event.Event;
+import org.briarproject.api.event.EventListener;
+import org.briarproject.api.event.MessageAddedEvent;
+import org.briarproject.api.event.MessageExpiredEvent;
+import org.briarproject.api.event.RemoteSubscriptionsUpdatedEvent;
+import org.briarproject.api.event.SubscriptionAddedEvent;
+import org.briarproject.api.event.SubscriptionRemovedEvent;
+import org.briarproject.api.lifecycle.LifecycleManager;
+import org.briarproject.api.messaging.Group;
+import org.briarproject.api.messaging.GroupId;
+import org.briarproject.api.messaging.GroupStatus;
+import roboguice.activity.RoboFragmentActivity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.AdapterView;
+import android.widget.AdapterView.OnItemClickListener;
+import android.widget.ImageButton;
+import android.widget.LinearLayout;
+import android.widget.ListView;
+
+public class GroupListActivity extends RoboFragmentActivity
+implements EventListener, OnClickListener, OnItemClickListener {
+
+	private static final Logger LOG =
+			Logger.getLogger(GroupListActivity.class.getName());
+
+	private final Map<GroupId,GroupId> groups =
+			new ConcurrentHashMap<GroupId,GroupId>();
+
+	private GroupListAdapter adapter = null;
+	private ListView list = null;
+	private ListLoadingProgressBar loading = null;
+	private ImageButton newGroupButton = null, manageGroupsButton = null;
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject private volatile DatabaseComponent db;
+	@Inject @DatabaseUiExecutor private volatile Executor dbUiExecutor;
+	@Inject private volatile LifecycleManager lifecycleManager;
+
+	@Override
+	public void onCreate(Bundle state) {
+		super.onCreate(state);
+		LinearLayout layout = new LinearLayout(this);
+		layout.setLayoutParams(MATCH_MATCH);
+		layout.setOrientation(VERTICAL);
+		layout.setGravity(CENTER_HORIZONTAL);
+
+		adapter = new GroupListAdapter(this);
+		list = new ListView(this);
+		// Give me all the width and all the unused height
+		list.setLayoutParams(MATCH_WRAP_1);
+		list.setAdapter(adapter);
+		list.setOnItemClickListener(this);
+		layout.addView(list);
+
+		// Show a progress bar while the list is loading
+		list.setVisibility(GONE);
+		loading = new ListLoadingProgressBar(this);
+		layout.addView(loading);
+
+		layout.addView(new HorizontalBorder(this));
+
+		LinearLayout footer = new LinearLayout(this);
+		footer.setLayoutParams(MATCH_WRAP);
+		footer.setOrientation(HORIZONTAL);
+		footer.setGravity(CENTER);
+		footer.addView(new HorizontalSpace(this));
+
+		newGroupButton = new ImageButton(this);
+		newGroupButton.setBackgroundResource(0);
+		newGroupButton.setImageResource(R.drawable.social_new_chat);
+		newGroupButton.setOnClickListener(this);
+		footer.addView(newGroupButton);
+		footer.addView(new HorizontalSpace(this));
+
+		manageGroupsButton = new ImageButton(this);
+		manageGroupsButton.setBackgroundResource(0);
+		manageGroupsButton.setImageResource(R.drawable.action_settings);
+		manageGroupsButton.setOnClickListener(this);
+		footer.addView(manageGroupsButton);
+		footer.addView(new HorizontalSpace(this));
+		layout.addView(footer);
+
+		setContentView(layout);
+	}
+
+	@Override
+	public void onResume() {
+		super.onResume();
+		db.addListener(this);
+		loadHeaders();
+	}
+
+	private void loadHeaders() {
+		clearHeaders();
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					int available = 0;
+					long now = System.currentTimeMillis();
+					for(GroupStatus s : db.getAvailableGroups()) {
+						Group g = s.getGroup();
+						if(s.isSubscribed()) {
+							try {
+								Collection<MessageHeader> headers =
+										db.getMessageHeaders(g.getId());
+								displayHeaders(g, headers);
+							} catch(NoSuchSubscriptionException e) {
+								if(LOG.isLoggable(INFO))
+									LOG.info("Subscription removed");
+							}
+						} else {
+							available++;
+						}
+					}
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Full load took " + duration + " ms");
+					displayAvailable(available);
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+			}
+		});
+	}
+
+	private void clearHeaders() {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				groups.clear();
+				list.setVisibility(GONE);
+				loading.setVisibility(VISIBLE);
+				adapter.clear();
+				adapter.notifyDataSetChanged();
+			}
+		});
+	}
+
+	private void displayHeaders(final Group g,
+			final Collection<MessageHeader> headers) {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				GroupId id = g.getId();
+				groups.put(id, id);
+				list.setVisibility(VISIBLE);
+				loading.setVisibility(GONE);
+				// Remove the old item, if any
+				GroupListItem item = findGroup(id);
+				if(item != null) adapter.remove(item);
+				// Add a new item
+				adapter.add(new GroupListItem(g, headers));
+				adapter.sort(ItemComparator.INSTANCE);
+				adapter.notifyDataSetChanged();
+				selectFirstUnread();
+			} 
+		});
+	}
+
+	private void displayAvailable(final int available) {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				list.setVisibility(VISIBLE);
+				loading.setVisibility(GONE);
+				adapter.setAvailable(available);
+				adapter.notifyDataSetChanged();
+			}
+		});
+	}
+
+	private GroupListItem findGroup(GroupId g) {
+		int count = adapter.getCount();
+		for(int i = 0; i < count; i++) {
+			GroupListItem item = adapter.getItem(i);
+			if(item == MANAGE) continue;
+			if(item.getGroup().getId().equals(g)) return item;
+		}
+		return null; // Not found
+	}
+
+	private void selectFirstUnread() {
+		int firstUnread = -1, count = adapter.getCount();
+		for(int i = 0; i < count; i++) {
+			GroupListItem item = adapter.getItem(i);
+			if(item == MANAGE) continue;
+			if(item.getUnreadCount() > 0) {
+				firstUnread = i;
+				break;
+			}
+		}
+		if(firstUnread == -1) list.setSelection(count - 1);
+		else list.setSelection(firstUnread);
+	}
+
+	@Override
+	public void onPause() {
+		super.onPause();
+		db.removeListener(this);
+	}
+
+	public void eventOccurred(Event e) {
+		if(e instanceof MessageAddedEvent) {
+			Group g = ((MessageAddedEvent) e).getGroup();
+			if(groups.containsKey(g.getId())) {
+				if(LOG.isLoggable(INFO)) LOG.info("Message added, reloading");
+				loadHeaders(g);
+			}
+		} else if(e instanceof MessageExpiredEvent) {
+			if(LOG.isLoggable(INFO)) LOG.info("Message expired, reloading");
+			loadHeaders();
+		} else if(e instanceof RemoteSubscriptionsUpdatedEvent) {
+			if(LOG.isLoggable(INFO))
+				LOG.info("Remote subscriptions changed, reloading");
+			loadAvailable();
+		} else if(e instanceof SubscriptionAddedEvent) {
+			if(LOG.isLoggable(INFO)) LOG.info("Group added, reloading");
+			loadHeaders();
+		} else if(e instanceof SubscriptionRemovedEvent) {
+			Group g = ((SubscriptionRemovedEvent) e).getGroup();
+			if(groups.containsKey(g.getId())) {
+				// Reload the group, expecting NoSuchSubscriptionException
+				if(LOG.isLoggable(INFO)) LOG.info("Group removed, reloading");
+				loadHeaders(g);
+			}
+		}
+	}
+
+	private void loadHeaders(final Group g) {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					Collection<MessageHeader> headers =
+							db.getMessageHeaders(g.getId());
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Partial load took " + duration + " ms");
+					displayHeaders(g, headers);
+				} catch(NoSuchSubscriptionException e) {
+					if(LOG.isLoggable(INFO)) LOG.info("Subscription removed");
+					removeGroup(g.getId());
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+			}
+		});
+	}
+
+	private void removeGroup(final GroupId g) {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				GroupListItem item = findGroup(g);
+				if(item != null) {
+					groups.remove(g);
+					adapter.remove(item);
+					adapter.notifyDataSetChanged();
+					selectFirstUnread();
+				}
+			}
+		});
+	}
+
+	private void loadAvailable() {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					int available = 0;
+					long now = System.currentTimeMillis();
+					for(GroupStatus s : db.getAvailableGroups())
+						if(!s.isSubscribed()) available++;
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Loading available took " + duration + " ms");
+					displayAvailable(available);
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+			}
+		});
+	}
+
+	public void onClick(View view) {
+		if(view == newGroupButton) {
+			startActivity(new Intent(this, CreateGroupActivity.class));
+		} else if(view == manageGroupsButton) {
+			startActivity(new Intent(this, ManageGroupsActivity.class));
+		}
+	}
+
+	public void onItemClick(AdapterView<?> parent, View view, int position,
+			long id) {
+		GroupListItem item = adapter.getItem(position);
+		if(item == MANAGE) {
+			startActivity(new Intent(this, ManageGroupsActivity.class));
+		} else {
+			Intent i = new Intent(this, GroupActivity.class);
+			Group g = item.getGroup();
+			i.putExtra("org.briarproject.GROUP_ID", g.getId().getBytes());
+			i.putExtra("org.briarproject.GROUP_NAME", g.getName());
+			startActivity(i);
+		}
+	}
+
+	private static class ItemComparator implements Comparator<GroupListItem> {
+
+		private static final ItemComparator INSTANCE = new ItemComparator();
+
+		public int compare(GroupListItem a, GroupListItem b) {
+			if(a == b) return 0;
+			// The manage groups item comes last
+			if(a == MANAGE) return 1;
+			if(b == MANAGE) return -1;
+			// The item with the newest message comes first
+			long aTime = a.getTimestamp(), bTime = b.getTimestamp();
+			if(aTime > bTime) return -1;
+			if(aTime < bTime) return 1;
+			// Break ties by group name
+			String aName = a.getGroup().getName();
+			String bName = b.getGroup().getName();
+			return String.CASE_INSENSITIVE_ORDER.compare(aName, bName);
+		}
+	}
+}

briar-android/src/org/briarproject/android/groups/GroupListAdapter.java

@@ -0,0 +1,121 @@
+package org.briarproject.android.groups;
+
+import static android.view.Gravity.CENTER;
+import static android.widget.LinearLayout.HORIZONTAL;
+import static java.text.DateFormat.SHORT;
+import static org.briarproject.android.groups.GroupListItem.MANAGE;
+import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP_1;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+import org.briarproject.R;
+import android.content.Context;
+import android.content.res.Resources;
+import android.text.format.DateUtils;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.BaseAdapter;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+class GroupListAdapter extends BaseAdapter {
+
+	private final Context ctx;
+	private final List<GroupListItem> list = new ArrayList<GroupListItem>();
+	private int available = 0;
+
+	GroupListAdapter(Context ctx) {
+		this.ctx = ctx;
+	}
+
+	public void setAvailable(int available) {
+		this.available = available;
+	}
+
+	public void add(GroupListItem item) {
+		list.add(item);
+	}
+
+	public void clear() {
+		list.clear();
+	}
+
+	public int getCount() {
+		return available == 0 ? list.size() : list.size() + 1;
+	}
+
+	public GroupListItem getItem(int position) {
+		return position == list.size() ? MANAGE : list.get(position);
+	}
+
+	public long getItemId(int position) {
+		return android.R.layout.simple_expandable_list_item_1;
+	}
+
+	public View getView(int position, View convertView, ViewGroup parent) {
+		GroupListItem item = getItem(position);
+		Resources res = ctx.getResources();
+
+		if(item == MANAGE) {
+			TextView manage = new TextView(ctx);
+			manage.setGravity(CENTER);
+			manage.setTextSize(18);
+			manage.setPadding(10, 10, 10, 10);
+			String format = res.getQuantityString(R.plurals.forums_available,
+					available);
+			manage.setText(String.format(format, available));
+			return manage;
+		}
+
+		LinearLayout layout = new LinearLayout(ctx);
+		layout.setOrientation(HORIZONTAL);
+		if(item.getUnreadCount() > 0)
+			layout.setBackgroundColor(res.getColor(R.color.unread_background));
+
+		TextView name = new TextView(ctx);
+		// Give me all the unused width
+		name.setLayoutParams(WRAP_WRAP_1);
+		name.setTextSize(18);
+		name.setMaxLines(1);
+		name.setPadding(10, 10, 10, 10);
+		int unread = item.getUnreadCount();
+		String groupName = item.getGroup().getName();
+		if(unread > 0) name.setText(groupName + " (" + unread + ")");
+		else name.setText(groupName);
+		layout.addView(name);
+
+		if(item.isEmpty()) {
+			TextView noPosts = new TextView(ctx);
+			noPosts.setTextSize(14);
+			noPosts.setPadding(10, 0, 10, 10);
+			noPosts.setTextColor(res.getColor(R.color.no_posts));
+			noPosts.setText(R.string.no_posts);
+			layout.addView(noPosts);
+		} else {
+			TextView date = new TextView(ctx);
+			date.setTextSize(14);
+			date.setPadding(10, 0, 10, 10);
+			long then = item.getTimestamp(), now = System.currentTimeMillis();
+			date.setText(DateUtils.formatSameDayTime(then, now, SHORT, SHORT));
+			layout.addView(date);
+		}
+
+		return layout;
+	}
+
+	@Override
+	public boolean isEmpty() {
+		return list.isEmpty() && available == 0;
+	}
+
+	public void remove(GroupListItem item) {
+		list.remove(item);
+	}
+
+	public void sort(Comparator<GroupListItem> comparator) {
+		Collections.sort(list, comparator);
+	}
+}

briar-android/src/org/briarproject/android/groups/GroupListItem.java

@@ -0,0 +1,72 @@
+package org.briarproject.android.groups;
+
+import java.util.Collection;
+import java.util.Collections;
+
+import org.briarproject.api.Author;
+import org.briarproject.api.db.MessageHeader;
+import org.briarproject.api.messaging.Group;
+
+class GroupListItem {
+
+	static final GroupListItem MANAGE = new GroupListItem(null,
+			Collections.<MessageHeader>emptyList());
+
+	private final Group group;
+	private final boolean empty;
+	private final String authorName, contentType;
+	private final long timestamp;
+	private final int unread;
+
+	GroupListItem(Group group, Collection<MessageHeader> headers) {
+		this.group = group;
+		empty = headers.isEmpty();
+		if(empty) {
+			authorName = null;
+			contentType = null;
+			timestamp = 0;
+			unread = 0;
+		} else {
+			MessageHeader newest = null;
+			long timestamp = 0;
+			int unread = 0;
+			for(MessageHeader h : headers) {
+				if(h.getTimestamp() > timestamp) {
+					timestamp = h.getTimestamp();
+					newest = h;
+				}
+				if(!h.isRead()) unread++;
+			}
+			Author a = newest.getAuthor();
+			if(a == null) authorName = null;
+			else authorName = a.getName();
+			contentType = newest.getContentType();
+			this.timestamp = newest.getTimestamp();
+			this.unread = unread;
+		}
+	}
+
+	Group getGroup() {
+		return group;
+	}
+
+	boolean isEmpty() {
+		return empty;
+	}
+
+	String getAuthorName() {
+		return authorName;
+	}
+
+	String getContentType() {
+		return contentType;
+	}
+
+	long getTimestamp() {
+		return timestamp;
+	}
+
+	int getUnreadCount() {
+		return unread;
+	}
+}

briar-android/src/org/briarproject/android/groups/ManageGroupsActivity.java

@@ -0,0 +1,157 @@
+package org.briarproject.android.groups;
+
+import static java.util.logging.Level.INFO;
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.android.groups.ManageGroupsItem.NONE;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_MATCH;
+
+import java.util.Collection;
+import java.util.Comparator;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import org.briarproject.android.util.ListLoadingProgressBar;
+import org.briarproject.api.android.DatabaseUiExecutor;
+import org.briarproject.api.db.DatabaseComponent;
+import org.briarproject.api.db.DbException;
+import org.briarproject.api.event.Event;
+import org.briarproject.api.event.EventListener;
+import org.briarproject.api.event.RemoteSubscriptionsUpdatedEvent;
+import org.briarproject.api.event.SubscriptionAddedEvent;
+import org.briarproject.api.event.SubscriptionRemovedEvent;
+import org.briarproject.api.lifecycle.LifecycleManager;
+import org.briarproject.api.messaging.Group;
+import org.briarproject.api.messaging.GroupStatus;
+import roboguice.activity.RoboFragmentActivity;
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.AdapterView;
+import android.widget.AdapterView.OnItemClickListener;
+import android.widget.ListView;
+
+public class ManageGroupsActivity extends RoboFragmentActivity
+implements EventListener, OnItemClickListener {
+
+	private static final Logger LOG =
+			Logger.getLogger(ManageGroupsActivity.class.getName());
+
+	private ManageGroupsAdapter adapter = null;
+	private ListView list = null;
+	private ListLoadingProgressBar loading = null;
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject private volatile DatabaseComponent db;
+	@Inject @DatabaseUiExecutor private volatile Executor dbUiExecutor;
+	@Inject private volatile LifecycleManager lifecycleManager;
+
+	@Override
+	public void onCreate(Bundle state) {
+		super.onCreate(state);
+
+		adapter = new ManageGroupsAdapter(this);
+		list = new ListView(this);
+		list.setLayoutParams(MATCH_MATCH);
+		list.setAdapter(adapter);
+		list.setOnItemClickListener(this);
+
+		// Show a progress bar while the list is loading
+		loading = new ListLoadingProgressBar(this);
+		setContentView(loading);
+	}
+
+	@Override
+	public void onResume() {
+		super.onResume();
+		db.addListener(this);
+		loadGroups();
+	}
+
+	private void loadGroups() {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					Collection<GroupStatus> available = db.getAvailableGroups();
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Load took " + duration + " ms");
+					displayGroups(available);
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+			}
+		});
+	}
+
+	private void displayGroups(final Collection<GroupStatus> available) {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				setContentView(list);
+				adapter.clear();
+				for(GroupStatus s : available)
+					adapter.add(new ManageGroupsItem(s));
+				adapter.sort(ItemComparator.INSTANCE);
+				adapter.notifyDataSetChanged();
+			}
+		});
+	}
+
+	@Override
+	public void onPause() {
+		super.onPause();
+		db.removeListener(this);
+	}
+
+	public void eventOccurred(Event e) {
+		if(e instanceof RemoteSubscriptionsUpdatedEvent) {
+			if(LOG.isLoggable(INFO))
+				LOG.info("Remote subscriptions changed, reloading");
+			loadGroups();
+		} else if(e instanceof SubscriptionAddedEvent) {
+			if(LOG.isLoggable(INFO)) LOG.info("Group added, reloading");
+			loadGroups();
+		} else if(e instanceof SubscriptionRemovedEvent) {
+			if(LOG.isLoggable(INFO)) LOG.info("Group removed, reloading");
+			loadGroups();
+		}
+	}
+
+	public void onItemClick(AdapterView<?> parent, View view, int position,
+			long id) {
+		ManageGroupsItem item = adapter.getItem(position);
+		if(item == NONE) return;
+		GroupStatus s = item.getGroupStatus();
+		Group g = s.getGroup();
+		Intent i = new Intent(this, ConfigureGroupActivity.class);
+		i.putExtra("org.briarproject.GROUP_ID", g.getId().getBytes());
+		i.putExtra("org.briarproject.GROUP_NAME", g.getName());
+		i.putExtra("org.briarproject.GROUP_SALT", g.getSalt());
+		i.putExtra("org.briarproject.SUBSCRIBED", s.isSubscribed());
+		i.putExtra("org.briarproject.VISIBLE_TO_ALL", s.isVisibleToAll());
+		startActivity(i);
+	}
+
+	private static class ItemComparator
+	implements Comparator<ManageGroupsItem> {
+
+		private static final ItemComparator INSTANCE = new ItemComparator();
+
+		public int compare(ManageGroupsItem a, ManageGroupsItem b) {
+			if(a == b) return 0;
+			if(a == NONE) return 1;
+			if(b == NONE) return -1;
+			String aName = a.getGroupStatus().getGroup().getName();
+			String bName = b.getGroupStatus().getGroup().getName();
+			return String.CASE_INSENSITIVE_ORDER.compare(aName, bName);
+		}
+	}
+}

briar-android/src/org/briarproject/android/groups/ManageGroupsAdapter.java

@@ -0,0 +1,113 @@
+package org.briarproject.android.groups;
+
+import static android.view.Gravity.CENTER;
+import static android.view.View.INVISIBLE;
+import static android.widget.LinearLayout.HORIZONTAL;
+import static android.widget.LinearLayout.VERTICAL;
+import static org.briarproject.android.groups.ManageGroupsItem.NONE;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+import org.briarproject.R;
+import org.briarproject.api.messaging.GroupStatus;
+import android.content.Context;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.BaseAdapter;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+class ManageGroupsAdapter extends BaseAdapter {
+
+	private final Context ctx;
+	private final List<ManageGroupsItem> list =
+			new ArrayList<ManageGroupsItem>();
+
+	ManageGroupsAdapter(Context ctx) {
+		this.ctx = ctx;
+	}
+
+	public void add(ManageGroupsItem item) {
+		list.add(item);
+	}
+
+	public void clear() {
+		list.clear();
+	}
+
+	public int getCount() {
+		return list.isEmpty() ? 1 : list.size();
+	}
+
+	public ManageGroupsItem getItem(int position) {
+		return list.isEmpty() ? NONE : list.get(position);
+	}
+
+	public long getItemId(int position) {
+		return android.R.layout.simple_expandable_list_item_1;
+	}
+
+	public View getView(int position, View convertView, ViewGroup parent) {
+		ManageGroupsItem item = getItem(position);
+
+		if(item == NONE) {
+			TextView none = new TextView(ctx);
+			none.setGravity(CENTER);
+			none.setTextSize(18);
+			none.setPadding(10, 10, 10, 10);
+			none.setText(R.string.no_forums_available);
+			return none;
+		}
+
+		GroupStatus s = item.getGroupStatus();
+		LinearLayout layout = new LinearLayout(ctx);
+		layout.setOrientation(HORIZONTAL);
+
+		ImageView subscribed = new ImageView(ctx);
+		subscribed.setPadding(5, 5, 5, 5);
+		subscribed.setImageResource(R.drawable.navigation_accept);
+		if(!s.isSubscribed()) subscribed.setVisibility(INVISIBLE);
+		layout.addView(subscribed);
+
+		LinearLayout innerLayout = new LinearLayout(ctx);
+		innerLayout.setOrientation(VERTICAL);
+
+		TextView name = new TextView(ctx);
+		name.setTextSize(18);
+		name.setMaxLines(1);
+		name.setPadding(0, 10, 10, 10);
+		name.setText(s.getGroup().getName());
+		innerLayout.addView(name);
+
+		TextView status = new TextView(ctx);
+		status.setTextSize(14);
+		status.setPadding(0, 0, 10, 10);
+		if(s.isSubscribed()) {
+			if(s.isVisibleToAll()) status.setText(R.string.subscribed_all);
+			else status.setText(R.string.subscribed_some);
+		} else {
+			status.setText(R.string.not_subscribed);
+		}
+		innerLayout.addView(status);
+		layout.addView(innerLayout);
+
+		return layout;
+	}
+
+	@Override
+	public boolean isEmpty() {
+		return false;
+	}
+
+	public void remove(ManageGroupsItem item) {
+		list.remove(item);
+	}
+
+	public void sort(Comparator<ManageGroupsItem> comparator) {
+		Collections.sort(list, comparator);
+	}
+}

briar-android/src/org/briarproject/android/groups/ManageGroupsItem.java

@@ -0,0 +1,18 @@
+package org.briarproject.android.groups;
+
+import org.briarproject.api.messaging.GroupStatus;
+
+class ManageGroupsItem {
+
+	static final ManageGroupsItem NONE = new ManageGroupsItem(null);
+
+	private final GroupStatus status;
+
+	ManageGroupsItem(GroupStatus status) {
+		this.status = status;
+	}
+
+	GroupStatus getGroupStatus() {
+		return status;
+	}
+}

briar-android/src/org/briarproject/android/groups/NoContactsDialog.java

@@ -0,0 +1,43 @@
+package org.briarproject.android.groups;
+
+import org.briarproject.R;
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.content.DialogInterface;
+import android.os.Bundle;
+import android.support.v4.app.DialogFragment;
+
+public class NoContactsDialog extends DialogFragment {
+
+	private Listener listener = null;
+
+	public void setListener(Listener listener) {
+		this.listener = listener;
+	}
+
+	@Override
+	public Dialog onCreateDialog(Bundle state) {
+		AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+		builder.setMessage(R.string.no_contacts);
+		builder.setPositiveButton(R.string.add_button,
+				new DialogInterface.OnClickListener() {
+			public void onClick(DialogInterface dialog, int id) {
+				listener.contactCreationSelected();
+			}
+		});
+		builder.setNegativeButton(R.string.cancel_button,
+				new DialogInterface.OnClickListener() {
+			public void onClick(DialogInterface dialog, int id) {
+				listener.contactCreationCancelled();
+			}
+		});
+		return builder.create();
+	}
+
+	public interface Listener {
+
+		void contactCreationSelected();
+
+		void contactCreationCancelled();
+	}
+}

briar-android/src/org/briarproject/android/groups/ReadGroupPostActivity.java

@@ -0,0 +1,276 @@
+package org.briarproject.android.groups;
+
+import static android.view.Gravity.CENTER;
+import static android.view.Gravity.CENTER_VERTICAL;
+import static android.widget.LinearLayout.HORIZONTAL;
+import static android.widget.LinearLayout.VERTICAL;
+import static java.text.DateFormat.SHORT;
+import static java.util.logging.Level.INFO;
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_WRAP;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_WRAP_1;
+import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP_1;
+
+import java.io.UnsupportedEncodingException;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import org.briarproject.R;
+import org.briarproject.android.util.HorizontalBorder;
+import org.briarproject.android.util.HorizontalSpace;
+import org.briarproject.api.android.DatabaseUiExecutor;
+import org.briarproject.api.db.DatabaseComponent;
+import org.briarproject.api.db.DbException;
+import org.briarproject.api.db.NoSuchMessageException;
+import org.briarproject.api.lifecycle.LifecycleManager;
+import org.briarproject.api.messaging.GroupId;
+import org.briarproject.api.messaging.MessageId;
+import roboguice.activity.RoboActivity;
+import android.content.Intent;
+import android.content.res.Resources;
+import android.os.Bundle;
+import android.text.format.DateUtils;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.ImageButton;
+import android.widget.LinearLayout;
+import android.widget.ScrollView;
+import android.widget.TextView;
+
+public class ReadGroupPostActivity extends RoboActivity
+implements OnClickListener {
+
+	static final int RESULT_REPLY = RESULT_FIRST_USER;
+	static final int RESULT_PREV = RESULT_FIRST_USER + 1;
+	static final int RESULT_NEXT = RESULT_FIRST_USER + 2;
+
+	private static final Logger LOG =
+			Logger.getLogger(ReadGroupPostActivity.class.getName());
+
+	private GroupId groupId = null;
+	private boolean read;
+	private ImageButton readButton = null, prevButton = null, nextButton = null;
+	private ImageButton replyButton = null;
+	private TextView content = null;
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject private volatile DatabaseComponent db;
+	@Inject @DatabaseUiExecutor private volatile Executor dbUiExecutor;
+	@Inject private volatile LifecycleManager lifecycleManager;
+	private volatile MessageId messageId = null;
+	private volatile long timestamp = -1;
+
+	@Override
+	public void onCreate(Bundle state) {
+		super.onCreate(state);
+
+		Intent i = getIntent();
+		byte[] b = i.getByteArrayExtra("org.briarproject.GROUP_ID");
+		if(b == null) throw new IllegalStateException();
+		groupId = new GroupId(b);
+		String groupName = i.getStringExtra("org.briarproject.GROUP_NAME");
+		if(groupName == null) throw new IllegalStateException();
+		setTitle(groupName);
+		b = i.getByteArrayExtra("org.briarproject.MESSAGE_ID");
+		if(b == null) throw new IllegalStateException();
+		messageId = new MessageId(b);
+		String contentType = i.getStringExtra("org.briarproject.CONTENT_TYPE");
+		if(contentType == null) throw new IllegalStateException();
+		timestamp = i.getLongExtra("org.briarproject.TIMESTAMP", -1);
+		if(timestamp == -1) throw new IllegalStateException();
+		String authorName = i.getStringExtra("org.briarproject.AUTHOR_NAME");
+
+		if(state == null) {
+			read = false;
+			setReadInDatabase(true);
+		} else {
+			read = state.getBoolean("org.briarproject.READ");
+		}
+
+		LinearLayout layout = new LinearLayout(this);
+		layout.setLayoutParams(MATCH_WRAP);
+		layout.setOrientation(VERTICAL);
+
+		ScrollView scrollView = new ScrollView(this);
+		// Give me all the width and all the unused height
+		scrollView.setLayoutParams(MATCH_WRAP_1);
+
+		LinearLayout message = new LinearLayout(this);
+		message.setOrientation(VERTICAL);
+		Resources res = getResources();
+		message.setBackgroundColor(res.getColor(R.color.content_background));
+
+		LinearLayout header = new LinearLayout(this);
+		header.setLayoutParams(MATCH_WRAP);
+		header.setOrientation(HORIZONTAL);
+		header.setGravity(CENTER_VERTICAL);
+
+		TextView name = new TextView(this);
+		// Give me all the unused width
+		name.setLayoutParams(WRAP_WRAP_1);
+		name.setTextSize(18);
+		name.setMaxLines(1);
+		name.setPadding(10, 10, 10, 10);
+		if(authorName == null) {
+			name.setTextColor(res.getColor(R.color.anonymous_author));
+			name.setText(R.string.anonymous);
+		} else {
+			name.setText(authorName);
+		}
+		header.addView(name);
+
+		TextView date = new TextView(this);
+		date.setTextSize(14);
+		date.setPadding(0, 10, 10, 10);
+		long now = System.currentTimeMillis();
+		date.setText(DateUtils.formatSameDayTime(timestamp, now, SHORT, SHORT));
+		header.addView(date);
+		message.addView(header);
+
+		if(contentType.equals("text/plain")) {
+			// Load and display the message body
+			content = new TextView(this);
+			content.setPadding(10, 0, 10, 10);
+			message.addView(content);
+			loadMessageBody();
+		}
+		scrollView.addView(message);
+		layout.addView(scrollView);
+
+		layout.addView(new HorizontalBorder(this));
+
+		LinearLayout footer = new LinearLayout(this);
+		footer.setLayoutParams(MATCH_WRAP);
+		footer.setOrientation(HORIZONTAL);
+		footer.setGravity(CENTER);
+
+		readButton = new ImageButton(this);
+		readButton.setBackgroundResource(0);
+		if(read) readButton.setImageResource(R.drawable.content_unread);
+		else readButton.setImageResource(R.drawable.content_read);
+		readButton.setOnClickListener(this);
+		footer.addView(readButton);
+		footer.addView(new HorizontalSpace(this));
+
+		prevButton = new ImageButton(this);
+		prevButton.setBackgroundResource(0);
+		prevButton.setImageResource(R.drawable.navigation_previous_item);
+		prevButton.setOnClickListener(this);
+		footer.addView(prevButton);
+		footer.addView(new HorizontalSpace(this));
+
+		nextButton = new ImageButton(this);
+		nextButton.setBackgroundResource(0);
+		nextButton.setImageResource(R.drawable.navigation_next_item);
+		nextButton.setOnClickListener(this);
+		footer.addView(nextButton);
+		footer.addView(new HorizontalSpace(this));
+
+		replyButton = new ImageButton(this);
+		replyButton.setBackgroundResource(0);
+		replyButton.setImageResource(R.drawable.social_reply_all);
+		replyButton.setOnClickListener(this);
+		footer.addView(replyButton);
+		layout.addView(footer);
+
+		setContentView(layout);
+	}
+
+	private void setReadInDatabase(final boolean read) {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					db.setReadFlag(messageId, read);
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Setting flag took " + duration + " ms");
+					setReadInUi(read);
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+			}
+		});
+	}
+
+	private void setReadInUi(final boolean read) {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				ReadGroupPostActivity.this.read = read;
+				if(read) readButton.setImageResource(R.drawable.content_unread);
+				else readButton.setImageResource(R.drawable.content_read);
+			}
+		});
+	}
+
+	private void loadMessageBody() {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					byte[] body = db.getMessageBody(messageId);
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Loading message took " + duration + " ms");
+					final String text = new String(body, "UTF-8");
+					runOnUiThread(new Runnable() {
+						public void run() {
+							content.setText(text);
+						}
+					});
+				} catch(NoSuchMessageException e) {
+					if(LOG.isLoggable(INFO)) LOG.info("Message removed");
+					runOnUiThread(new Runnable() {
+						public void run() {
+							finish();
+						}
+					});
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				} catch(UnsupportedEncodingException e) {
+					throw new RuntimeException(e);
+				}
+			}
+		});
+	}
+
+	@Override
+	public void onSaveInstanceState(Bundle state) {
+		super.onSaveInstanceState(state);
+		state.putBoolean("org.briarproject.READ", read);
+	}
+
+	public void onClick(View view) {
+		if(view == readButton) {
+			setReadInDatabase(!read);
+		} else if(view == prevButton) {
+			setResult(RESULT_PREV);
+			finish();
+		} else if(view == nextButton) {
+			setResult(RESULT_NEXT);
+			finish();
+		} else if(view == replyButton) {
+			Intent i = new Intent(this, WriteGroupPostActivity.class);
+			i.putExtra("org.briarproject.GROUP_ID", groupId.getBytes());
+			i.putExtra("org.briarproject.PARENT_ID", messageId.getBytes());
+			i.putExtra("org.briarproject.TIMESTAMP", timestamp);
+			startActivity(i);
+			setResult(RESULT_REPLY);
+			finish();
+		}
+	}
+}

briar-android/src/org/briarproject/android/groups/WriteGroupPostActivity.java

@@ -0,0 +1,299 @@
+package org.briarproject.android.groups;
+
+import static android.text.InputType.TYPE_CLASS_TEXT;
+import static android.text.InputType.TYPE_TEXT_FLAG_CAP_SENTENCES;
+import static android.view.Gravity.CENTER_VERTICAL;
+import static android.widget.LinearLayout.HORIZONTAL;
+import static android.widget.LinearLayout.VERTICAL;
+import static android.widget.Toast.LENGTH_LONG;
+import static java.util.logging.Level.INFO;
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_WRAP;
+
+import java.io.IOException;
+import java.io.UnsupportedEncodingException;
+import java.security.GeneralSecurityException;
+import java.util.Collection;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import org.briarproject.R;
+import org.briarproject.android.identity.CreateIdentityActivity;
+import org.briarproject.android.identity.LocalAuthorItem;
+import org.briarproject.android.identity.LocalAuthorItemComparator;
+import org.briarproject.android.identity.LocalAuthorSpinnerAdapter;
+import org.briarproject.android.util.HorizontalSpace;
+import org.briarproject.api.AuthorId;
+import org.briarproject.api.LocalAuthor;
+import org.briarproject.api.android.DatabaseUiExecutor;
+import org.briarproject.api.crypto.CryptoComponent;
+import org.briarproject.api.crypto.CryptoExecutor;
+import org.briarproject.api.crypto.KeyParser;
+import org.briarproject.api.crypto.PrivateKey;
+import org.briarproject.api.db.DatabaseComponent;
+import org.briarproject.api.db.DbException;
+import org.briarproject.api.lifecycle.LifecycleManager;
+import org.briarproject.api.messaging.Group;
+import org.briarproject.api.messaging.GroupId;
+import org.briarproject.api.messaging.Message;
+import org.briarproject.api.messaging.MessageFactory;
+import org.briarproject.api.messaging.MessageId;
+import roboguice.activity.RoboActivity;
+import android.content.Intent;
+import android.content.res.Resources;
+import android.os.Bundle;
+import android.text.InputType;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.AdapterView;
+import android.widget.AdapterView.OnItemSelectedListener;
+import android.widget.EditText;
+import android.widget.ImageButton;
+import android.widget.LinearLayout;
+import android.widget.Spinner;
+import android.widget.TextView;
+import android.widget.Toast;
+
+public class WriteGroupPostActivity extends RoboActivity
+implements OnItemSelectedListener, OnClickListener {
+
+	private static final Logger LOG =
+			Logger.getLogger(WriteGroupPostActivity.class.getName());
+
+	private LocalAuthorSpinnerAdapter adapter = null;
+	private Spinner spinner = null;
+	private ImageButton sendButton = null;
+	private TextView to = null;
+	private EditText content = null;
+	private AuthorId localAuthorId = null;
+	private GroupId groupId = null;
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject private volatile DatabaseComponent db;
+	@Inject @DatabaseUiExecutor private volatile Executor dbUiExecutor;
+	@Inject private volatile LifecycleManager lifecycleManager;
+	@Inject @CryptoExecutor private volatile Executor cryptoExecutor;
+	@Inject private volatile CryptoComponent crypto;
+	@Inject private volatile MessageFactory messageFactory;
+	private volatile MessageId parentId = null;
+	private volatile long timestamp = -1;
+	private volatile LocalAuthor localAuthor = null;
+	private volatile Group group = null;
+
+	@Override
+	public void onCreate(Bundle state) {
+		super.onCreate(state);
+
+		Intent i = getIntent();
+		byte[] b = i.getByteArrayExtra("org.briarproject.GROUP_ID");
+		if(b == null) throw new IllegalStateException();
+		groupId = new GroupId(b);
+
+		b = i.getByteArrayExtra("org.briarproject.PARENT_ID");
+		if(b != null) parentId = new MessageId(b);
+		timestamp = i.getLongExtra("org.briarproject.TIMESTAMP", -1);
+
+		if(state != null) {
+			b = state.getByteArray("org.briarproject.LOCAL_AUTHOR_ID");
+			if(b != null) localAuthorId = new AuthorId(b);
+		}
+
+		LinearLayout layout = new LinearLayout(this);
+		layout.setLayoutParams(MATCH_WRAP);
+		layout.setOrientation(VERTICAL);
+
+		LinearLayout header = new LinearLayout(this);
+		header.setLayoutParams(MATCH_WRAP);
+		header.setOrientation(HORIZONTAL);
+		header.setGravity(CENTER_VERTICAL);
+
+		TextView from = new TextView(this);
+		from.setTextSize(18);
+		from.setPadding(10, 10, 0, 10);
+		from.setText(R.string.from);
+		header.addView(from);
+
+		adapter = new LocalAuthorSpinnerAdapter(this, true);
+		spinner = new Spinner(this);
+		spinner.setAdapter(adapter);
+		spinner.setOnItemSelectedListener(this);
+		header.addView(spinner);
+
+		header.addView(new HorizontalSpace(this));
+
+		sendButton = new ImageButton(this);
+		sendButton.setBackgroundResource(0);
+		sendButton.setImageResource(R.drawable.social_send_now);
+		sendButton.setEnabled(false); // Enabled after loading the group
+		sendButton.setOnClickListener(this);
+		header.addView(sendButton);
+		layout.addView(header);
+
+		to = new TextView(this);
+		to.setTextSize(18);
+		to.setPadding(10, 0, 10, 10);
+		to.setText(R.string.to);
+		layout.addView(to);
+
+		content = new EditText(this);
+		content.setId(1);
+		int inputType = TYPE_CLASS_TEXT | InputType.TYPE_TEXT_FLAG_MULTI_LINE
+				| TYPE_TEXT_FLAG_CAP_SENTENCES;
+		content.setInputType(inputType);
+		layout.addView(content);
+
+		setContentView(layout);
+	}
+
+	@Override
+	public void onResume() {
+		super.onResume();
+		loadAuthorsAndGroup();
+	}
+
+	private void loadAuthorsAndGroup() {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					Collection<LocalAuthor> localAuthors = db.getLocalAuthors();
+					group = db.getGroup(groupId);
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Load took " + duration + " ms");
+					displayAuthorsAndGroup(localAuthors);
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+			}
+		});
+	}
+
+	private void displayAuthorsAndGroup(
+			final Collection<LocalAuthor> localAuthors) {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				if(localAuthors.isEmpty()) throw new IllegalStateException();
+				adapter.clear();
+				for(LocalAuthor a : localAuthors)
+					adapter.add(new LocalAuthorItem(a));
+				adapter.sort(LocalAuthorItemComparator.INSTANCE);
+				adapter.notifyDataSetChanged();
+				int count = adapter.getCount();
+				for(int i = 0; i < count; i++) {
+					LocalAuthorItem item = adapter.getItem(i);
+					if(item == LocalAuthorItem.ANONYMOUS) continue;
+					if(item == LocalAuthorItem.NEW) continue;
+					if(item.getLocalAuthor().getId().equals(localAuthorId)) {
+						localAuthor = item.getLocalAuthor();
+						spinner.setSelection(i);
+						break;
+					}
+				}
+				Resources res = getResources();
+				String format = res.getString(R.string.format_to);
+				to.setText(String.format(format, group.getName()));
+				sendButton.setEnabled(true);
+			}
+		});
+	}
+
+	@Override
+	public void onSaveInstanceState(Bundle state) {
+		super.onSaveInstanceState(state);
+		if(localAuthorId != null) {
+			byte[] b =  localAuthorId.getBytes();
+			state.putByteArray("org.briarproject.LOCAL_AUTHOR_ID", b);
+		}
+	}
+
+	public void onItemSelected(AdapterView<?> parent, View view, int position,
+			long id) {
+		LocalAuthorItem item = adapter.getItem(position);
+		if(item == LocalAuthorItem.ANONYMOUS) {
+			localAuthor = null;
+			localAuthorId = null;
+		} else if(item == LocalAuthorItem.NEW) {
+			localAuthor = null;
+			localAuthorId = null;
+			startActivity(new Intent(this, CreateIdentityActivity.class));
+		} else {
+			localAuthor = item.getLocalAuthor();
+			localAuthorId = localAuthor.getId();
+		}
+	}
+
+	public void onNothingSelected(AdapterView<?> parent) {
+		localAuthor = null;
+		localAuthorId = null;
+	}
+
+	public void onClick(View view) {
+		if(group == null) throw new IllegalStateException();
+		try {
+			createMessage(content.getText().toString().getBytes("UTF-8"));
+		} catch(UnsupportedEncodingException e) {
+			throw new RuntimeException(e);
+		}
+		Toast.makeText(this, R.string.post_sent_toast, LENGTH_LONG).show();
+		finish();
+	}
+
+	private void createMessage(final byte[] body) {
+		cryptoExecutor.execute(new Runnable() {
+			public void run() {
+				// Don't use an earlier timestamp than the parent
+				long time = System.currentTimeMillis();
+				time = Math.max(time, timestamp + 1);
+				Message m;
+				try {
+					if(localAuthor == null) {
+						m = messageFactory.createAnonymousMessage(parentId,
+								group, "text/plain", time, body);
+					} else {
+						KeyParser keyParser = crypto.getSignatureKeyParser();
+						byte[] b = localAuthor.getPrivateKey();
+						PrivateKey authorKey = keyParser.parsePrivateKey(b);
+						m = messageFactory.createPseudonymousMessage(parentId,
+								group, localAuthor, authorKey, "text/plain",
+								time, body);
+					}
+				} catch(GeneralSecurityException e) {
+					throw new RuntimeException(e);
+				} catch(IOException e) {
+					throw new RuntimeException(e);
+				}
+				storeMessage(m);
+			}
+		});
+	}
+
+	private void storeMessage(final Message m) {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					db.addLocalMessage(m);
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Storing message took " + duration + " ms");
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+			}
+		});
+	}
+}

briar-android/src/org/briarproject/android/identity/CreateIdentityActivity.java

@@ -0,0 +1,166 @@
+package org.briarproject.android.identity;
+
+import static android.text.InputType.TYPE_CLASS_TEXT;
+import static android.text.InputType.TYPE_TEXT_FLAG_CAP_WORDS;
+import static android.view.Gravity.CENTER;
+import static android.view.Gravity.CENTER_HORIZONTAL;
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
+import static android.view.inputmethod.InputMethodManager.HIDE_IMPLICIT_ONLY;
+import static android.widget.LinearLayout.VERTICAL;
+import static java.util.logging.Level.INFO;
+import static java.util.logging.Level.WARNING;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_MATCH;
+import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP;
+
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import org.briarproject.R;
+import org.briarproject.api.AuthorFactory;
+import org.briarproject.api.LocalAuthor;
+import org.briarproject.api.android.DatabaseUiExecutor;
+import org.briarproject.api.crypto.CryptoComponent;
+import org.briarproject.api.crypto.CryptoExecutor;
+import org.briarproject.api.crypto.KeyPair;
+import org.briarproject.api.db.DatabaseComponent;
+import org.briarproject.api.db.DbException;
+import org.briarproject.api.lifecycle.LifecycleManager;
+import roboguice.activity.RoboActivity;
+import android.os.Bundle;
+import android.view.KeyEvent;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.inputmethod.InputMethodManager;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.LinearLayout;
+import android.widget.ProgressBar;
+import android.widget.TextView;
+import android.widget.TextView.OnEditorActionListener;
+
+public class CreateIdentityActivity extends RoboActivity
+implements OnEditorActionListener, OnClickListener {
+
+	private static final Logger LOG =
+			Logger.getLogger(CreateIdentityActivity.class.getName());
+
+	@Inject @CryptoExecutor private Executor cryptoExecutor;
+	private EditText nicknameEntry = null;
+	private Button createButton = null;
+	private ProgressBar progress = null;
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject private volatile CryptoComponent crypto;
+	@Inject private volatile AuthorFactory authorFactory;
+	@Inject private volatile DatabaseComponent db;
+	@Inject @DatabaseUiExecutor private volatile Executor dbUiExecutor;
+	@Inject private volatile LifecycleManager lifecycleManager;
+
+	@Override
+	public void onCreate(Bundle state) {
+		super.onCreate(state);
+		LinearLayout layout = new LinearLayout(this);
+		layout.setLayoutParams(MATCH_MATCH);
+		layout.setOrientation(VERTICAL);
+		layout.setGravity(CENTER_HORIZONTAL);
+
+		TextView chooseNickname = new TextView(this);
+		chooseNickname.setGravity(CENTER);
+		chooseNickname.setTextSize(18);
+		chooseNickname.setPadding(10, 10, 10, 0);
+		chooseNickname.setText(R.string.choose_nickname);
+		layout.addView(chooseNickname);
+
+		nicknameEntry = new EditText(this) {
+			@Override
+			protected void onTextChanged(CharSequence text, int start,
+					int lengthBefore, int lengthAfter) {
+				if(createButton != null)
+					createButton.setEnabled(getText().length() > 0);
+			}
+		};
+		nicknameEntry.setId(1);
+		nicknameEntry.setMaxLines(1);
+		int inputType = TYPE_CLASS_TEXT | TYPE_TEXT_FLAG_CAP_WORDS;
+		nicknameEntry.setInputType(inputType);
+		nicknameEntry.setOnEditorActionListener(this);
+		layout.addView(nicknameEntry);
+
+		createButton = new Button(this);
+		createButton.setLayoutParams(WRAP_WRAP);
+		createButton.setText(R.string.create_button);
+		createButton.setEnabled(false);
+		createButton.setOnClickListener(this);
+		layout.addView(createButton);
+
+		progress = new ProgressBar(this);
+		progress.setLayoutParams(WRAP_WRAP);
+		progress.setIndeterminate(true);
+		progress.setVisibility(GONE);
+		layout.addView(progress);
+
+		setContentView(layout);
+	}
+
+	public boolean onEditorAction(TextView textView, int actionId, KeyEvent e) {
+		validateNickname();
+		return true;
+	}
+
+	public void onClick(View view) {
+		if(!validateNickname()) return;
+		final String nickname = nicknameEntry.getText().toString();
+		// Replace the button with a progress bar
+		createButton.setVisibility(GONE);
+		progress.setVisibility(VISIBLE);
+		// Create the identity in a background thread
+		cryptoExecutor.execute(new Runnable() {
+			public void run() {
+				KeyPair keyPair = crypto.generateSignatureKeyPair();
+				final byte[] publicKey = keyPair.getPublic().getEncoded();
+				final byte[] privateKey = keyPair.getPrivate().getEncoded();
+				LocalAuthor a = authorFactory.createLocalAuthor(nickname,
+						publicKey, privateKey);
+				storeLocalAuthor(a);
+			}
+		});
+	}
+
+	private void storeLocalAuthor(final LocalAuthor a) {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					db.addLocalAuthor(a);
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Storing author took " + duration + " ms");
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					if(LOG.isLoggable(INFO))
+						LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+				runOnUiThread(new Runnable() {
+					public void run() {
+						finish();
+					}
+				});
+			}
+		});
+	}
+
+	private boolean validateNickname() {
+		if(nicknameEntry.getText().toString().equals("")) return false;
+		// Hide the soft keyboard
+		Object o = getSystemService(INPUT_METHOD_SERVICE);
+		((InputMethodManager) o).toggleSoftInput(HIDE_IMPLICIT_ONLY, 0);
+		return true;
+	}
+}

briar-android/src/org/briarproject/android/identity/LocalAuthorItem.java

@@ -0,0 +1,19 @@
+package org.briarproject.android.identity;
+
+import org.briarproject.api.LocalAuthor;
+
+public class LocalAuthorItem {
+
+	public static final LocalAuthorItem ANONYMOUS = new LocalAuthorItem(null);
+	public static final LocalAuthorItem NEW = new LocalAuthorItem(null);
+
+	private final LocalAuthor localAuthor;
+
+	public LocalAuthorItem(LocalAuthor localAuthor) {
+		this.localAuthor = localAuthor;
+	}
+
+	public LocalAuthor getLocalAuthor() {
+		return localAuthor;
+	}
+}

briar-android/src/org/briarproject/android/identity/LocalAuthorItemComparator.java

@@ -0,0 +1,21 @@
+package org.briarproject.android.identity;
+
+import static org.briarproject.android.identity.LocalAuthorItem.ANONYMOUS;
+import static org.briarproject.android.identity.LocalAuthorItem.NEW;
+
+import java.util.Comparator;
+
+public class LocalAuthorItemComparator implements Comparator<LocalAuthorItem> {
+
+	public static final LocalAuthorItemComparator INSTANCE =
+			new LocalAuthorItemComparator();
+
+	public int compare(LocalAuthorItem a, LocalAuthorItem b) {
+		if(a == b) return 0;
+		if(a == ANONYMOUS || b == NEW) return -1;
+		if(a == NEW || b == ANONYMOUS) return 1;
+		String aName = a.getLocalAuthor().getName();
+		String bName = b.getLocalAuthor().getName();
+		return String.CASE_INSENSITIVE_ORDER.compare(aName, bName);
+	}
+}

briar-android/src/org/briarproject/android/identity/LocalAuthorSpinnerAdapter.java

@@ -0,0 +1,88 @@
+package org.briarproject.android.identity;
+
+import static org.briarproject.android.identity.LocalAuthorItem.ANONYMOUS;
+import static org.briarproject.android.identity.LocalAuthorItem.NEW;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+import org.briarproject.R;
+import android.content.Context;
+import android.content.res.Resources;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.BaseAdapter;
+import android.widget.SpinnerAdapter;
+import android.widget.TextView;
+
+public class LocalAuthorSpinnerAdapter extends BaseAdapter
+implements SpinnerAdapter {
+
+	private final Context ctx;
+	private final boolean includeAnonymous;
+	private final List<LocalAuthorItem> list = new ArrayList<LocalAuthorItem>();
+
+	public LocalAuthorSpinnerAdapter(Context ctx, boolean includeAnonymous) {
+		this.ctx = ctx;
+		this.includeAnonymous = includeAnonymous;
+	}
+
+	public void add(LocalAuthorItem item) {
+		list.add(item);
+	}
+
+	public void clear() {
+		list.clear();
+	}
+
+	public int getCount() {
+		if(list.isEmpty()) return 0;
+		return includeAnonymous ? list.size() + 2 : list.size() + 1;
+	}
+
+	@Override
+	public View getDropDownView(int position, View convertView,
+			ViewGroup parent) {
+		return getView(position, convertView, parent);
+	}
+
+	public LocalAuthorItem getItem(int position) {
+		if(includeAnonymous) {
+			if(position == 0) return ANONYMOUS;
+			if(position == list.size() + 1) return NEW;
+			return list.get(position - 1);
+		} else {
+			if(position == list.size()) return NEW;
+			return list.get(position);
+		}
+	}
+
+	public long getItemId(int position) {
+		return android.R.layout.simple_spinner_item;
+	}
+
+	public View getView(int position, View convertView, ViewGroup parent) {
+		TextView name = new TextView(ctx);
+		name.setTextSize(18);
+		name.setMaxLines(1);
+		Resources res = ctx.getResources();
+		int pad = res.getInteger(R.integer.spinner_padding);
+		name.setPadding(pad, pad, pad, pad);
+		LocalAuthorItem item = getItem(position);
+		if(item == ANONYMOUS) name.setText(R.string.anonymous);
+		else if(item == NEW) name.setText(R.string.new_identity_item);
+		else name.setText(item.getLocalAuthor().getName());
+		return name;
+	}
+
+	@Override
+	public boolean isEmpty() {
+		return list.isEmpty();
+	}
+
+	public void sort(Comparator<LocalAuthorItem> comparator) {
+		Collections.sort(list, comparator);
+	}
+}

briar-android/src/org/briarproject/android/invitation/AddContactActivity.java

@@ -0,0 +1,465 @@
+package org.briarproject.android.invitation;
+
+import static android.bluetooth.BluetoothAdapter.ACTION_SCAN_MODE_CHANGED;
+import static android.bluetooth.BluetoothAdapter.ACTION_STATE_CHANGED;
+import static android.bluetooth.BluetoothAdapter.EXTRA_STATE;
+import static android.bluetooth.BluetoothAdapter.STATE_ON;
+import static android.net.wifi.WifiManager.NETWORK_STATE_CHANGED_ACTION;
+import static android.widget.Toast.LENGTH_LONG;
+import static java.util.logging.Level.INFO;
+import static java.util.logging.Level.WARNING;
+
+import java.util.Collection;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import org.briarproject.R;
+import org.briarproject.android.identity.LocalAuthorItem;
+import org.briarproject.android.identity.LocalAuthorItemComparator;
+import org.briarproject.android.identity.LocalAuthorSpinnerAdapter;
+import org.briarproject.api.AuthorId;
+import org.briarproject.api.LocalAuthor;
+import org.briarproject.api.android.DatabaseUiExecutor;
+import org.briarproject.api.android.ReferenceManager;
+import org.briarproject.api.crypto.CryptoComponent;
+import org.briarproject.api.db.DatabaseComponent;
+import org.briarproject.api.db.DbException;
+import org.briarproject.api.invitation.InvitationListener;
+import org.briarproject.api.invitation.InvitationState;
+import org.briarproject.api.invitation.InvitationTask;
+import org.briarproject.api.invitation.InvitationTaskFactory;
+import org.briarproject.api.lifecycle.LifecycleManager;
+import roboguice.activity.RoboActivity;
+import android.bluetooth.BluetoothAdapter;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.net.wifi.WifiInfo;
+import android.net.wifi.WifiManager;
+import android.os.Bundle;
+import android.widget.Toast;
+
+public class AddContactActivity extends RoboActivity
+implements InvitationListener {
+
+	private static final Logger LOG =
+			Logger.getLogger(AddContactActivity.class.getName());
+
+	@Inject private CryptoComponent crypto;
+	@Inject private InvitationTaskFactory invitationTaskFactory;
+	@Inject private ReferenceManager referenceManager;
+	private AddContactView view = null;
+	private InvitationTask task = null;
+	private long taskHandle = -1;
+	private AuthorId localAuthorId = null;
+	private String networkName = null;
+	private boolean bluetoothEnabled = false;
+	private BluetoothWifiStateReceiver receiver = null;
+	private int localInvitationCode = -1, remoteInvitationCode = -1;
+	private int localConfirmationCode = -1, remoteConfirmationCode = -1;
+	private boolean connected = false, connectionFailed = false;
+	private boolean localCompared = false, remoteCompared = false;
+	private boolean localMatched = false, remoteMatched = false;
+	private String contactName = null;
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject private volatile DatabaseComponent db;
+	@Inject @DatabaseUiExecutor private volatile Executor dbUiExecutor;
+	@Inject private volatile LifecycleManager lifecycleManager;
+
+	@Override
+	public void onCreate(Bundle state) {
+		super.onCreate(state);
+		if(state == null) {
+			// This is a new activity
+			setView(new NetworkSetupView(this));
+		} else {
+			// Restore the activity's state
+			byte[] b = state.getByteArray("org.briarproject.LOCAL_AUTHOR_ID");
+			if(b != null) localAuthorId = new AuthorId(b);
+			taskHandle = state.getLong("org.briarproject.TASK_HANDLE", -1);
+			task = referenceManager.getReference(taskHandle,
+					InvitationTask.class);
+			if(task == null) {
+				// No background task - we must be in an initial or final state
+				localInvitationCode = state.getInt("org.briarproject.LOCAL_CODE");
+				remoteInvitationCode = state.getInt("org.briarproject.REMOTE_CODE");
+				connectionFailed = state.getBoolean("org.briarproject.FAILED");
+				contactName = state.getString("org.briarproject.CONTACT_NAME");
+				if(contactName != null) {
+					localCompared = remoteCompared = true;
+					localMatched = remoteMatched = true;
+				}
+				// Set the appropriate view for the state
+				if(localInvitationCode == -1) {
+					setView(new NetworkSetupView(this));
+				} else if(remoteInvitationCode == -1) {
+					setView(new InvitationCodeView(this));
+				} else if(connectionFailed) {
+					setView(new ConnectionFailedView(this));
+				} else if(contactName == null) {
+					setView(new CodesDoNotMatchView(this));
+				} else {
+					showToastAndFinish();
+					return;
+				}
+			} else {
+				// A background task exists - listen to it and get its state
+				InvitationState s = task.addListener(this);
+				localInvitationCode = s.getLocalInvitationCode();
+				remoteInvitationCode = s.getRemoteInvitationCode();
+				localConfirmationCode = s.getLocalConfirmationCode();
+				remoteConfirmationCode = s.getRemoteConfirmationCode();
+				connected = s.getConnected();
+				connectionFailed = s.getConnectionFailed();
+				localCompared = s.getLocalCompared();
+				remoteCompared = s.getRemoteCompared();
+				localMatched = s.getLocalMatched();
+				remoteMatched = s.getRemoteMatched();
+				contactName = s.getContactName();
+				// Set the appropriate view for the state
+				if(localInvitationCode == -1) {
+					setView(new NetworkSetupView(this));
+				} else if(remoteInvitationCode == -1) {
+					setView(new InvitationCodeView(this));
+				} else if(connectionFailed) {
+					setView(new ConnectionFailedView(this));
+				} else if(connected && localConfirmationCode == -1) {
+					setView(new ConnectedView(this));
+				} else if(localConfirmationCode == -1) {
+					setView(new ConnectionView(this));
+				} else if(!localCompared) {
+					setView(new ConfirmationCodeView(this));
+				} else if(!remoteCompared) {
+					setView(new WaitForContactView(this));
+				} else if(localMatched && remoteMatched) {
+					if(contactName == null) {
+						setView(new ContactDetailsView(this));
+					} else {
+						showToastAndFinish();
+						return;
+					}
+				} else {
+					setView(new CodesDoNotMatchView(this));
+				}
+			}
+		}
+
+		// Listen for Bluetooth and WiFi state changes
+		IntentFilter filter = new IntentFilter();
+		filter.addAction(ACTION_STATE_CHANGED);
+		filter.addAction(ACTION_SCAN_MODE_CHANGED);
+		filter.addAction(NETWORK_STATE_CHANGED_ACTION);
+		receiver = new BluetoothWifiStateReceiver();
+		registerReceiver(receiver, filter);
+
+		// Get the current Bluetooth and WiFi state
+		BluetoothAdapter bluetooth = BluetoothAdapter.getDefaultAdapter();
+		if(bluetooth != null) bluetoothEnabled = bluetooth.isEnabled();
+		view.bluetoothStateChanged();
+		WifiManager wifi = (WifiManager) getSystemService(WIFI_SERVICE);
+		if(wifi != null && wifi.isWifiEnabled()) {
+			WifiInfo info = wifi.getConnectionInfo();
+			if(info.getNetworkId() != -1) networkName = info.getSSID();
+		}
+		view.wifiStateChanged();
+	}
+
+	private void showToastAndFinish() {
+		Toast.makeText(this, R.string.contact_added_toast, LENGTH_LONG).show();
+		finish();
+	}
+
+	@Override
+	public void onResume() {
+		super.onResume();
+		view.populate();
+	}
+
+	@Override
+	public void onSaveInstanceState(Bundle state) {
+		super.onSaveInstanceState(state);
+		if(localAuthorId != null) {
+			byte[] b = localAuthorId.getBytes();
+			state.putByteArray("org.briarproject.LOCAL_AUTHOR_ID", b);
+		}
+		state.putInt("org.briarproject.LOCAL_CODE", localInvitationCode);
+		state.putInt("org.briarproject.REMOTE_CODE", remoteInvitationCode);
+		state.putBoolean("org.briarproject.FAILED", connectionFailed);
+		state.putString("org.briarproject.CONTACT_NAME", contactName);
+		if(task != null) state.putLong("org.briarproject.TASK_HANDLE", taskHandle);
+	}
+
+	@Override
+	public void onDestroy() {
+		super.onDestroy();
+		if(task != null) task.removeListener(this);
+		if(receiver != null) unregisterReceiver(receiver);
+	}
+
+	void setView(AddContactView view) {
+		this.view = view;
+		view.init(this);
+		setContentView(view);
+	}
+
+	void reset(AddContactView view) {
+		// Don't reset localAuthorId, networkName or bluetoothEnabled
+		task = null;
+		taskHandle = -1;
+		localInvitationCode = -1;
+		localConfirmationCode = remoteConfirmationCode = -1;
+		connected = connectionFailed = false;
+		localCompared = remoteCompared = false;
+		localMatched = remoteMatched = false;
+		contactName = null;
+		setView(view);
+	}
+
+	void loadLocalAuthors(final LocalAuthorSpinnerAdapter adapter) {
+		dbUiExecutor.execute(new Runnable() {
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					long now = System.currentTimeMillis();
+					Collection<LocalAuthor> localAuthors = db.getLocalAuthors();
+					long duration = System.currentTimeMillis() - now;
+					if(LOG.isLoggable(INFO))
+						LOG.info("Loading authors took " + duration + " ms");
+					displayLocalAuthors(adapter, localAuthors);
+				} catch(DbException e) {
+					if(LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				} catch(InterruptedException e) {
+					LOG.info("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+			}
+		});
+	}
+
+	private void displayLocalAuthors(final LocalAuthorSpinnerAdapter adapter,
+			final Collection<LocalAuthor> localAuthors) {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				if(localAuthors.isEmpty()) throw new IllegalStateException();
+				adapter.clear();
+				for(LocalAuthor a : localAuthors)
+					adapter.add(new LocalAuthorItem(a));
+				adapter.sort(LocalAuthorItemComparator.INSTANCE);
+				adapter.notifyDataSetChanged();
+			}
+		});
+	}
+
+	void setLocalAuthorId(AuthorId localAuthorId) {
+		this.localAuthorId = localAuthorId;
+	}
+
+	AuthorId getLocalAuthorId() {
+		return localAuthorId;
+	}
+
+	String getNetworkName() {
+		return networkName;
+	}
+
+	boolean isBluetoothEnabled() {
+		return bluetoothEnabled;
+	}
+
+	int getLocalInvitationCode() {
+		if(localInvitationCode == -1)
+			localInvitationCode = crypto.generateInvitationCode();
+		return localInvitationCode;
+	}
+
+	void remoteInvitationCodeEntered(int code) {
+		if(localAuthorId == null) throw new IllegalStateException();
+		if(localInvitationCode == -1) throw new IllegalStateException();
+		setView(new ConnectionView(this));
+		task = invitationTaskFactory.createTask(localAuthorId,
+				localInvitationCode, code);
+		taskHandle = referenceManager.putReference(task, InvitationTask.class);
+		task.addListener(AddContactActivity.this);
+		// Add a second listener so we can remove the first in onDestroy(),
+		// allowing the activity to be garbage collected if it's destroyed
+		task.addListener(new ReferenceCleaner(referenceManager, taskHandle));
+		task.connect();
+	}
+
+	int getLocalConfirmationCode() {
+		return localConfirmationCode;
+	}
+
+	void remoteConfirmationCodeEntered(int code) {
+		localCompared = true;
+		if(code == remoteConfirmationCode) {
+			localMatched = true;
+			if(remoteMatched) setView(new ContactDetailsView(this));
+			else if(remoteCompared) setView(new CodesDoNotMatchView(this));
+			else setView(new WaitForContactView(this));
+			task.localConfirmationSucceeded();
+		} else {
+			localMatched = false;
+			setView(new CodesDoNotMatchView(this));
+			task.localConfirmationFailed();
+		}
+	}
+
+	String getContactName() {
+		return contactName;
+	}
+
+	public void connectionSucceeded() {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				connected = true;
+				setView(new ConnectedView(AddContactActivity.this));
+			}
+		});
+	}
+
+	public void connectionFailed() {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				connectionFailed = true;
+				setView(new ConnectionFailedView(AddContactActivity.this));
+			}
+		});
+	}
+
+	public void keyAgreementSucceeded(final int localCode,
+			final int remoteCode) {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				localConfirmationCode = localCode;
+				remoteConfirmationCode = remoteCode;
+				setView(new ConfirmationCodeView(AddContactActivity.this));
+			}
+		});
+	}
+
+	public void keyAgreementFailed() {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				connectionFailed = true;
+				setView(new ConnectionFailedView(AddContactActivity.this));
+			}
+		});
+	}
+
+	public void remoteConfirmationSucceeded() {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				remoteCompared = true;
+				remoteMatched = true;
+				if(localMatched)
+					setView(new ContactDetailsView(AddContactActivity.this));
+			}
+		});
+	}
+
+	public void remoteConfirmationFailed() {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				remoteCompared = true;
+				remoteMatched = false;
+				if(localMatched)
+					setView(new CodesDoNotMatchView(AddContactActivity.this));
+			}
+		});
+	}
+
+	public void pseudonymExchangeSucceeded(final String remoteName) {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				contactName = remoteName;
+				showToastAndFinish();
+			}
+		});
+	}
+
+	public void pseudonymExchangeFailed() {
+		runOnUiThread(new Runnable() {
+			public void run() {
+				setView(new ConnectionFailedView(AddContactActivity.this));
+			}
+		});
+	}
+
+	private class BluetoothWifiStateReceiver extends BroadcastReceiver {
+
+		public void onReceive(Context ctx, Intent intent) {
+			String action = intent.getAction();
+			if(action.equals(ACTION_STATE_CHANGED)) {
+				int state = intent.getIntExtra(EXTRA_STATE, 0);
+				bluetoothEnabled = state == STATE_ON;
+				view.bluetoothStateChanged();
+			} else if(action.equals(ACTION_SCAN_MODE_CHANGED)) {
+				view.bluetoothStateChanged();
+			} else if(action.equals(NETWORK_STATE_CHANGED_ACTION)) {
+				WifiManager wifi = (WifiManager) getSystemService(WIFI_SERVICE);
+				if(wifi == null || !wifi.isWifiEnabled()) {
+					networkName = null;
+				} else {
+					WifiInfo info = wifi.getConnectionInfo();
+					if(info.getNetworkId() == -1) networkName = null;
+					else networkName = info.getSSID();
+				}
+				view.wifiStateChanged();
+			}
+		}
+	}
+
+	/**
+	 * Cleans up the reference to the invitation task when the task completes.
+	 * This class is static to prevent memory leaks.
+	 */
+	private static class ReferenceCleaner implements InvitationListener {
+
+		private final ReferenceManager referenceManager;
+		private final long handle;
+
+		private ReferenceCleaner(ReferenceManager referenceManager,
+				long handle) {
+			this.referenceManager = referenceManager;
+			this.handle = handle;
+		}
+
+		public void connectionSucceeded() {
+			// Wait for key agreement to succeed or fail
+		}
+
+		public void connectionFailed() {
+			referenceManager.removeReference(handle, InvitationTask.class);
+		}
+
+		public void keyAgreementSucceeded(int localCode, int remoteCode) {
+			// Wait for remote confirmation to succeed or fail
+		}
+
+		public void keyAgreementFailed() {
+			referenceManager.removeReference(handle, InvitationTask.class);
+		}
+
+		public void remoteConfirmationSucceeded() {
+			// Wait for the pseudonym exchange to succeed or fail
+		}
+
+		public void remoteConfirmationFailed() {
+			referenceManager.removeReference(handle, InvitationTask.class);
+		}
+
+		public void pseudonymExchangeSucceeded(String remoteName) {
+			referenceManager.removeReference(handle, InvitationTask.class);
+		}
+
+		public void pseudonymExchangeFailed() {
+			referenceManager.removeReference(handle, InvitationTask.class);
+		}
+	}
+}

briar-android/src/org/briarproject/android/invitation/AddContactView.java

@@ -0,0 +1,29 @@
+package org.briarproject.android.invitation;
+
+import static android.view.Gravity.CENTER_HORIZONTAL;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_MATCH;
+import android.content.Context;
+import android.widget.LinearLayout;
+
+abstract class AddContactView extends LinearLayout {
+
+	protected AddContactActivity container = null;
+
+	AddContactView(Context ctx) {
+		super(ctx);
+	}
+
+	void init(AddContactActivity container) {
+		this.container = container;
+		setLayoutParams(MATCH_MATCH);
+		setOrientation(VERTICAL);
+		setGravity(CENTER_HORIZONTAL);
+		populate();
+	}
+
+	abstract void populate();
+
+	void wifiStateChanged() {}
+
+	void bluetoothStateChanged() {}
+}

briar-android/src/org/briarproject/android/invitation/BluetoothStatusView.java

@@ -0,0 +1,84 @@
+package org.briarproject.android.invitation;
+
+import static android.bluetooth.BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE;
+import static android.provider.Settings.ACTION_BLUETOOTH_SETTINGS;
+import static android.view.Gravity.CENTER;
+import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP_1;
+import org.briarproject.R;
+import android.bluetooth.BluetoothAdapter;
+import android.content.Context;
+import android.content.Intent;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.ImageButton;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+class BluetoothStatusView extends LinearLayout implements OnClickListener {
+
+	public BluetoothStatusView(Context ctx) {
+		super(ctx);
+	}
+
+	void init() {
+		setOrientation(HORIZONTAL);
+		setGravity(CENTER);
+		populate();
+	}
+
+	void populate() {
+		removeAllViews();
+		Context ctx = getContext();
+		TextView status = new TextView(ctx);
+		status.setLayoutParams(WRAP_WRAP_1);
+		status.setTextSize(14);
+		status.setPadding(10, 10, 10, 10);
+		BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
+		if(adapter == null) {
+			ImageView warning = new ImageView(ctx);
+			warning.setPadding(5, 5, 5, 5);
+			warning.setImageResource(R.drawable.alerts_and_states_warning);
+			addView(warning);
+			status.setText(R.string.bluetooth_not_available);
+			addView(status);
+		} else if(adapter.getScanMode() == SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
+			ImageView ok = new ImageView(ctx);
+			ok.setPadding(5, 5, 5, 5);
+			ok.setImageResource(R.drawable.navigation_accept);
+			addView(ok);
+			status.setText(R.string.bluetooth_discoverable);
+			addView(status);
+			ImageButton settings = new ImageButton(ctx);
+			settings.setImageResource(R.drawable.action_settings);
+			settings.setOnClickListener(this);
+			addView(settings);
+		} else if(adapter.isEnabled()) {
+			ImageView warning = new ImageView(ctx);
+			warning.setPadding(5, 5, 5, 5);
+			warning.setImageResource(R.drawable.alerts_and_states_warning);
+			addView(warning);
+			status.setText(R.string.bluetooth_not_discoverable);
+			addView(status);
+			ImageButton settings = new ImageButton(ctx);
+			settings.setImageResource(R.drawable.action_settings);
+			settings.setOnClickListener(this);
+			addView(settings);
+		} else {
+			ImageView warning = new ImageView(ctx);
+			warning.setPadding(5, 5, 5, 5);
+			warning.setImageResource(R.drawable.alerts_and_states_warning);
+			addView(warning);
+			status.setText(R.string.bluetooth_disabled);
+			addView(status);
+			ImageButton settings = new ImageButton(ctx);
+			settings.setImageResource(R.drawable.action_settings);
+			settings.setOnClickListener(this);
+			addView(settings);
+		}
+	}
+
+	public void onClick(View view) {
+		getContext().startActivity(new Intent(ACTION_BLUETOOTH_SETTINGS));
+	}
+}

briar-android/src/org/briarproject/android/invitation/CodeEntryListener.java

@@ -0,0 +1,6 @@
+package org.briarproject.android.invitation;
+
+interface CodeEntryListener {
+
+	void codeEntered(int remoteCode);
+}

briar-android/src/org/briarproject/android/invitation/CodeEntryView.java

@@ -0,0 +1,98 @@
+package org.briarproject.android.invitation;
+
+import static android.content.Context.INPUT_METHOD_SERVICE;
+import static android.text.InputType.TYPE_CLASS_NUMBER;
+import static android.view.Gravity.CENTER;
+import static android.view.Gravity.CENTER_HORIZONTAL;
+import static android.view.inputmethod.InputMethodManager.HIDE_IMPLICIT_ONLY;
+import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP;
+import org.briarproject.R;
+import android.content.Context;
+import android.view.KeyEvent;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.inputmethod.InputMethodManager;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+import android.widget.TextView.OnEditorActionListener;
+
+class CodeEntryView extends LinearLayout
+implements OnEditorActionListener, OnClickListener {
+
+	private CodeEntryListener listener = null;
+	private EditText codeEntry = null;
+	private Button continueButton = null;
+
+	public CodeEntryView(Context ctx) {
+		super(ctx);
+	}
+
+	void init(CodeEntryListener listener, String prompt) {
+		this.listener = listener;
+		setOrientation(VERTICAL);
+		setGravity(CENTER_HORIZONTAL);
+
+		Context ctx = getContext();
+		TextView enterCode = new TextView(ctx);
+		enterCode.setGravity(CENTER_HORIZONTAL);
+		enterCode.setTextSize(14);
+		enterCode.setPadding(10, 10, 10, 0);
+		enterCode.setText(prompt);
+		addView(enterCode);
+
+		LinearLayout innerLayout = new LinearLayout(ctx);
+		innerLayout.setOrientation(HORIZONTAL);
+		innerLayout.setGravity(CENTER);
+
+		codeEntry = new EditText(ctx) {
+			@Override
+			protected void onTextChanged(CharSequence text, int start,
+					int lengthBefore, int lengthAfter) {
+				if(continueButton != null)
+					continueButton.setEnabled(getText().length() == 6);
+			}
+		};
+		codeEntry.setId(1); // FIXME: State is not saved and restored
+		codeEntry.setTextSize(26);
+		codeEntry.setOnEditorActionListener(this);
+		codeEntry.setMinEms(5);
+		codeEntry.setMaxEms(5);
+		codeEntry.setMaxLines(1);
+		codeEntry.setInputType(TYPE_CLASS_NUMBER);
+		innerLayout.addView(codeEntry);
+
+		continueButton = new Button(ctx);
+		continueButton.setLayoutParams(WRAP_WRAP);
+		continueButton.setText(R.string.continue_button);
+		continueButton.setEnabled(false);
+		continueButton.setOnClickListener(this);
+		innerLayout.addView(continueButton);
+		addView(innerLayout);
+	}
+
+	public boolean onEditorAction(TextView textView, int actionId, KeyEvent e) {
+		if(!validateAndReturnCode()) codeEntry.setText("");
+		return true;
+	}
+
+	public void onClick(View view) {
+		if(!validateAndReturnCode()) codeEntry.setText("");
+	}
+
+	private boolean validateAndReturnCode() {
+		String remoteCodeString = codeEntry.getText().toString();
+		int remoteCode;
+		try {
+			remoteCode = Integer.parseInt(remoteCodeString);
+		} catch(NumberFormatException e) {
+			return false;
+		}
+		// Hide the soft keyboard
+		Object o = getContext().getSystemService(INPUT_METHOD_SERVICE);
+		((InputMethodManager) o).toggleSoftInput(HIDE_IMPLICIT_ONLY, 0);
+		listener.codeEntered(remoteCode);
+		return true;
+	}
+}

briar-android/src/org/briarproject/android/invitation/CodesDoNotMatchView.java

@@ -0,0 +1,55 @@
+package org.briarproject.android.invitation;
+
+import static android.view.Gravity.CENTER;
+import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP;
+import org.briarproject.R;
+import android.content.Context;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.Button;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+class CodesDoNotMatchView extends AddContactView implements OnClickListener {
+
+	CodesDoNotMatchView(Context ctx) {
+		super(ctx);
+	}
+
+	void populate() {
+		removeAllViews();
+		Context ctx = getContext();
+		LinearLayout innerLayout = new LinearLayout(ctx);
+		innerLayout.setOrientation(HORIZONTAL);
+		innerLayout.setGravity(CENTER);
+
+		ImageView icon = new ImageView(ctx);
+		icon.setImageResource(R.drawable.alerts_and_states_error);
+		innerLayout.addView(icon);
+
+		TextView failed = new TextView(ctx);
+		failed.setTextSize(22);
+		failed.setPadding(10, 10, 10, 10);
+		failed.setText(R.string.codes_do_not_match);
+		innerLayout.addView(failed);
+		addView(innerLayout);
+
+		TextView interfering = new TextView(ctx);
+		interfering.setTextSize(14);
+		interfering.setPadding(10, 0, 10, 10);
+		interfering.setText(R.string.interfering);
+		addView(interfering);
+
+		Button tryAgainButton = new Button(ctx);
+		tryAgainButton.setLayoutParams(WRAP_WRAP);
+		tryAgainButton.setText(R.string.try_again_button);
+		tryAgainButton.setOnClickListener(this);
+		addView(tryAgainButton);
+	}
+
+	public void onClick(View view) {
+		// Try again
+		container.reset(new NetworkSetupView(container));
+	}
+}

briar-android/src/org/briarproject/android/invitation/ConfirmationCodeView.java

@@ -0,0 +1,60 @@
+package org.briarproject.android.invitation;
+
+import static android.view.Gravity.CENTER;
+import static android.view.Gravity.CENTER_HORIZONTAL;
+import org.briarproject.R;
+import android.content.Context;
+import android.content.res.Resources;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+class ConfirmationCodeView extends AddContactView implements CodeEntryListener {
+
+	ConfirmationCodeView(Context ctx) {
+		super(ctx);
+	}
+
+	void populate() {
+		removeAllViews();
+		Context ctx = getContext();
+		LinearLayout innerLayout = new LinearLayout(ctx);
+		innerLayout.setOrientation(HORIZONTAL);
+		innerLayout.setGravity(CENTER);
+
+		ImageView icon = new ImageView(ctx);
+		icon.setImageResource(R.drawable.navigation_accept);
+		innerLayout.addView(icon);
+
+		TextView connected = new TextView(ctx);
+		connected.setTextSize(22);
+		connected.setPadding(10, 10, 10, 10);
+		connected.setText(R.string.connected_to_contact);
+		innerLayout.addView(connected);
+		addView(innerLayout);
+
+		TextView yourCode = new TextView(ctx);
+		yourCode.setGravity(CENTER_HORIZONTAL);
+		yourCode.setTextSize(14);
+		yourCode.setPadding(10, 10, 10, 10);
+		yourCode.setText(R.string.your_confirmation_code);
+		addView(yourCode);
+
+		TextView code = new TextView(ctx);
+		code.setGravity(CENTER_HORIZONTAL);
+		code.setTextSize(50);
+		code.setPadding(10, 0, 10, 10);
+		int localCode = container.getLocalConfirmationCode();
+		code.setText(String.format("%06d", localCode));
+		addView(code);
+
+		CodeEntryView codeEntry = new CodeEntryView(ctx);
+		Resources res = getResources();
+		codeEntry.init(this, res.getString(R.string.enter_confirmation_code));
+		addView(codeEntry);
+	}
+
+	public void codeEntered(int remoteCode) {
+		container.remoteConfirmationCodeEntered(remoteCode);
+	}
+}

briar-android/src/org/briarproject/android/invitation/ConnectedView.java

@@ -0,0 +1,49 @@
+package org.briarproject.android.invitation;
+
+import static android.view.Gravity.CENTER;
+import org.briarproject.R;
+import android.content.Context;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.ProgressBar;
+import android.widget.TextView;
+
+class ConnectedView extends AddContactView {
+
+	ConnectedView(Context ctx) {
+		super(ctx);
+	}
+
+	void populate() {
+		removeAllViews();
+		Context ctx = getContext();
+		LinearLayout innerLayout = new LinearLayout(ctx);
+		innerLayout.setOrientation(HORIZONTAL);
+		innerLayout.setGravity(CENTER);
+
+		ImageView icon = new ImageView(ctx);
+		icon.setImageResource(R.drawable.navigation_accept);
+		innerLayout.addView(icon);
+
+		TextView connected = new TextView(ctx);
+		connected.setTextSize(22);
+		connected.setPadding(10, 10, 10, 10);
+		connected.setText(R.string.connected_to_contact);
+		innerLayout.addView(connected);
+		addView(innerLayout);
+
+		innerLayout = new LinearLayout(ctx);
+		innerLayout.setOrientation(HORIZONTAL);
+		innerLayout.setGravity(CENTER);
+
+		ProgressBar progress = new ProgressBar(ctx);
+		progress.setIndeterminate(true);
+		progress.setPadding(10, 10, 10, 10);
+		innerLayout.addView(progress);
+
+		TextView connecting = new TextView(ctx);
+		connecting.setText(R.string.calculating_confirmation_code);
+		innerLayout.addView(connecting);
+		addView(innerLayout);
+	}
+}

briar-android/src/org/briarproject/android/invitation/ConnectionFailedView.java

@@ -0,0 +1,85 @@
+package org.briarproject.android.invitation;
+
+import static android.view.Gravity.CENTER;
+import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP;
+import org.briarproject.R;
+import android.content.Context;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.Button;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+class ConnectionFailedView extends AddContactView implements OnClickListener {
+
+	private WifiStatusView wifi = null;
+	private BluetoothStatusView bluetooth = null;
+	private Button tryAgainButton = null;
+
+	ConnectionFailedView(Context ctx) {
+		super(ctx);
+	}
+
+	void populate() {
+		removeAllViews();
+		Context ctx = getContext();
+		LinearLayout innerLayout = new LinearLayout(ctx);
+		innerLayout.setOrientation(HORIZONTAL);
+		innerLayout.setGravity(CENTER);
+
+		ImageView icon = new ImageView(ctx);
+		icon.setImageResource(R.drawable.alerts_and_states_error);
+		innerLayout.addView(icon);
+
+		TextView failed = new TextView(ctx);
+		failed.setTextSize(22);
+		failed.setPadding(10, 10, 10, 10);
+		failed.setText(R.string.connection_failed);
+		innerLayout.addView(failed);
+		addView(innerLayout);
+
+		TextView checkNetwork = new TextView(ctx);
+		checkNetwork.setTextSize(14);
+		checkNetwork.setPadding(10, 0, 10, 10);
+		checkNetwork.setText(R.string.check_same_network);
+		addView(checkNetwork);
+
+		wifi = new WifiStatusView(ctx);
+		wifi.init();
+		addView(wifi);
+
+		bluetooth = new BluetoothStatusView(ctx);
+		bluetooth.init();
+		addView(bluetooth);
+
+		tryAgainButton = new Button(ctx);
+		tryAgainButton.setLayoutParams(WRAP_WRAP);
+		tryAgainButton.setText(R.string.try_again_button);
+		tryAgainButton.setOnClickListener(this);
+		enableOrDisableTryAgainButton();
+		addView(tryAgainButton);
+	}
+
+	void wifiStateChanged() {
+		if(wifi != null) wifi.populate();
+		enableOrDisableTryAgainButton();
+	}
+
+	void bluetoothStateChanged() {
+		if(bluetooth != null) bluetooth.populate();
+		enableOrDisableTryAgainButton();
+	}
+
+	private void enableOrDisableTryAgainButton() {
+		if(tryAgainButton == null) return; // Activity not created yet
+		boolean bluetoothEnabled = container.isBluetoothEnabled();
+		String networkName = container.getNetworkName();
+		tryAgainButton.setEnabled(bluetoothEnabled || networkName != null);
+	}
+
+	public void onClick(View view) {
+		// Try again
+		container.reset(new InvitationCodeView(container));
+	}
+}

briar-android/src/org/briarproject/android/invitation/ConnectionView.java

@@ -0,0 +1,72 @@
+package org.briarproject.android.invitation;
+
+import static android.view.Gravity.CENTER;
+import static android.view.Gravity.CENTER_HORIZONTAL;
+import org.briarproject.R;
+import android.content.Context;
+import android.widget.LinearLayout;
+import android.widget.ProgressBar;
+import android.widget.TextView;
+
+class ConnectionView extends AddContactView {
+
+	ConnectionView(Context ctx) {
+		super(ctx);
+	}
+
+	void populate() {
+		removeAllViews();
+		Context ctx = getContext();
+		TextView yourCode = new TextView(ctx);
+		yourCode.setGravity(CENTER_HORIZONTAL);
+		yourCode.setTextSize(14);
+		yourCode.setPadding(10, 10, 10, 10);
+		yourCode.setText(R.string.your_invitation_code);
+		addView(yourCode);
+
+		TextView code = new TextView(ctx);
+		code.setGravity(CENTER_HORIZONTAL);
+		code.setTextSize(50);
+		code.setPadding(10, 0, 10, 10);
+		int localCode = container.getLocalInvitationCode();
+		code.setText(String.format("%06d", localCode));
+		addView(code);
+
+		String networkName = container.getNetworkName();
+		if(networkName != null) {
+			LinearLayout innerLayout = new LinearLayout(ctx);
+			innerLayout.setOrientation(HORIZONTAL);
+			innerLayout.setGravity(CENTER);
+
+			ProgressBar progress = new ProgressBar(ctx);
+			progress.setIndeterminate(true);
+			progress.setPadding(10, 10, 10, 10);
+			innerLayout.addView(progress);
+
+			TextView connecting = new TextView(ctx);
+			String format = getResources().getString(
+					R.string.format_connecting_wifi);
+			connecting.setText(String.format(format, networkName));
+			innerLayout.addView(connecting);
+
+			addView(innerLayout);
+		}
+
+		if(container.isBluetoothEnabled()) {
+			LinearLayout innerLayout = new LinearLayout(ctx);
+			innerLayout.setOrientation(HORIZONTAL);
+			innerLayout.setGravity(CENTER);
+
+			ProgressBar progress = new ProgressBar(ctx);
+			progress.setPadding(10, 10, 10, 10);
+			progress.setIndeterminate(true);
+			innerLayout.addView(progress);
+
+			TextView connecting = new TextView(ctx);
+			connecting.setText(R.string.connecting_bluetooth);
+			innerLayout.addView(connecting);
+
+			addView(innerLayout);
+		}
+	}
+}

briar-android/src/org/briarproject/android/invitation/ContactDetailsView.java

@@ -0,0 +1,65 @@
+package org.briarproject.android.invitation;
+
+import static android.view.Gravity.CENTER;
+import static android.view.Gravity.CENTER_HORIZONTAL;
+import org.briarproject.R;
+import android.content.Context;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.ProgressBar;
+import android.widget.TextView;
+
+class ContactDetailsView extends AddContactView {
+
+	ContactDetailsView(Context ctx) {
+		super(ctx);
+	}
+
+	void populate() {
+		removeAllViews();
+		Context ctx = getContext();
+		LinearLayout innerLayout = new LinearLayout(ctx);
+		innerLayout.setOrientation(HORIZONTAL);
+		innerLayout.setGravity(CENTER);
+
+		ImageView icon = new ImageView(ctx);
+		icon.setImageResource(R.drawable.navigation_accept);
+		innerLayout.addView(icon);
+
+		TextView connected = new TextView(ctx);
+		connected.setTextSize(22);
+		connected.setPadding(10, 10, 10, 10);
+		connected.setText(R.string.connected_to_contact);
+		innerLayout.addView(connected);
+		addView(innerLayout);
+
+		TextView yourCode = new TextView(ctx);
+		yourCode.setGravity(CENTER_HORIZONTAL);
+		yourCode.setTextSize(14);
+		yourCode.setPadding(10, 0, 10, 10);
+		yourCode.setText(R.string.your_confirmation_code);
+		addView(yourCode);
+
+		TextView code = new TextView(ctx);
+		code.setGravity(CENTER_HORIZONTAL);
+		code.setTextSize(50);
+		code.setPadding(10, 0, 10, 10);
+		int localCode = container.getLocalConfirmationCode();
+		code.setText(String.format("%06d", localCode));
+		addView(code);
+
+		innerLayout = new LinearLayout(ctx);
+		innerLayout.setOrientation(HORIZONTAL);
+		innerLayout.setGravity(CENTER);
+
+		ProgressBar progress = new ProgressBar(ctx);
+		progress.setIndeterminate(true);
+		progress.setPadding(10, 10, 10, 10);
+		innerLayout.addView(progress);
+
+		TextView connecting = new TextView(ctx);
+		connecting.setText(R.string.exchanging_contact_details);
+		innerLayout.addView(connecting);
+		addView(innerLayout);
+	}
+}

briar-android/src/org/briarproject/android/invitation/InvitationCodeView.java

@@ -0,0 +1,42 @@
+package org.briarproject.android.invitation;
+
+import static android.view.Gravity.CENTER_HORIZONTAL;
+import org.briarproject.R;
+import android.content.Context;
+import android.content.res.Resources;
+import android.widget.TextView;
+
+class InvitationCodeView extends AddContactView implements CodeEntryListener {
+
+	InvitationCodeView(Context ctx) {
+		super(ctx);
+	}
+
+	void populate() {
+		removeAllViews();
+		Context ctx = getContext();
+		TextView yourCode = new TextView(ctx);
+		yourCode.setGravity(CENTER_HORIZONTAL);
+		yourCode.setTextSize(14);
+		yourCode.setPadding(10, 10, 10, 10);
+		yourCode.setText(R.string.your_invitation_code);
+		addView(yourCode);
+
+		TextView code = new TextView(ctx);
+		code.setGravity(CENTER_HORIZONTAL);
+		code.setTextSize(50);
+		code.setPadding(10, 0, 10, 10);
+		int localCode = container.getLocalInvitationCode();
+		code.setText(String.format("%06d", localCode));
+		addView(code);
+
+		CodeEntryView codeEntry = new CodeEntryView(ctx);
+		Resources res = getResources();
+		codeEntry.init(this, res.getString(R.string.enter_invitation_code));
+		addView(codeEntry);
+	}
+
+	public void codeEntered(int remoteCode) {
+		container.remoteInvitationCodeEntered(remoteCode);
+	}
+}

briar-android/src/org/briarproject/android/invitation/NetworkSetupView.java

@@ -0,0 +1,121 @@
+package org.briarproject.android.invitation;
+
+import static android.view.Gravity.CENTER;
+import static org.briarproject.android.identity.LocalAuthorItem.NEW;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_WRAP;
+import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP;
+import org.briarproject.R;
+import org.briarproject.android.identity.CreateIdentityActivity;
+import org.briarproject.android.identity.LocalAuthorItem;
+import org.briarproject.android.identity.LocalAuthorSpinnerAdapter;
+import org.briarproject.api.AuthorId;
+import android.content.Context;
+import android.content.Intent;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.AdapterView;
+import android.widget.AdapterView.OnItemSelectedListener;
+import android.widget.Button;
+import android.widget.LinearLayout;
+import android.widget.Spinner;
+import android.widget.TextView;
+
+class NetworkSetupView extends AddContactView
+implements OnItemSelectedListener, OnClickListener {
+
+	private LocalAuthorSpinnerAdapter adapter = null;
+	private Spinner spinner = null;
+	private WifiStatusView wifi = null;
+	private BluetoothStatusView bluetooth = null;
+	private Button continueButton = null;
+
+	NetworkSetupView(Context ctx) {
+		super(ctx);
+	}
+
+	void populate() {
+		removeAllViews();
+		Context ctx = getContext();
+
+		LinearLayout innerLayout = new LinearLayout(ctx);
+		innerLayout.setLayoutParams(MATCH_WRAP);
+		innerLayout.setOrientation(HORIZONTAL);
+		innerLayout.setGravity(CENTER);
+
+		TextView yourNickname = new TextView(ctx);
+		yourNickname.setTextSize(18);
+		yourNickname.setPadding(10, 10, 10, 10);
+		yourNickname.setText(R.string.your_nickname);
+		innerLayout.addView(yourNickname);
+
+		adapter = new LocalAuthorSpinnerAdapter(ctx, false);
+		spinner = new Spinner(ctx);
+		spinner.setAdapter(adapter);
+		spinner.setOnItemSelectedListener(this);
+		container.loadLocalAuthors(adapter);
+		innerLayout.addView(spinner);
+		addView(innerLayout);
+
+		wifi = new WifiStatusView(ctx);
+		wifi.init();
+		addView(wifi);
+
+		bluetooth = new BluetoothStatusView(ctx);
+		bluetooth.init();
+		addView(bluetooth);
+
+		TextView faceToFace = new TextView(ctx);
+		faceToFace.setGravity(CENTER);
+		faceToFace.setTextSize(14);
+		faceToFace.setPadding(10, 10, 10, 10);
+		faceToFace.setText(R.string.fact_to_face);
+		addView(faceToFace);
+
+		continueButton = new Button(ctx);
+		continueButton.setLayoutParams(WRAP_WRAP);
+		continueButton.setText(R.string.continue_button);
+		continueButton.setOnClickListener(this);
+		enableOrDisableContinueButton();
+		addView(continueButton);
+	}
+
+	void wifiStateChanged() {
+		if(wifi != null) wifi.populate();
+		enableOrDisableContinueButton();
+	}
+
+	void bluetoothStateChanged() {
+		if(bluetooth != null) bluetooth.populate();
+		enableOrDisableContinueButton();
+	}
+
+	private void enableOrDisableContinueButton() {
+		if(continueButton == null) return; // Activity not created yet
+		AuthorId localAuthorId = container.getLocalAuthorId();
+		boolean bluetoothEnabled = container.isBluetoothEnabled();
+		String networkName = container.getNetworkName();
+		boolean networkAvailable = bluetoothEnabled || networkName != null;
+		continueButton.setEnabled(localAuthorId != null && networkAvailable);
+	}
+
+	public void onItemSelected(AdapterView<?> parent, View view, int position,
+			long id) {
+		LocalAuthorItem item = adapter.getItem(position);
+		if(item == NEW) {
+			container.setLocalAuthorId(null);
+			Intent i = new Intent(container, CreateIdentityActivity.class);
+			container.startActivity(i);
+		} else {
+			container.setLocalAuthorId(item.getLocalAuthor().getId());
+		}
+		enableOrDisableContinueButton();
+	}
+
+	public void onNothingSelected(AdapterView<?> parent) {
+		container.setLocalAuthorId(null);
+	}
+
+	public void onClick(View view) {
+		container.setView(new InvitationCodeView(container));
+	}
+}

briar-android/src/org/briarproject/android/invitation/WaitForContactView.java

@@ -0,0 +1,65 @@
+package org.briarproject.android.invitation;
+
+import static android.view.Gravity.CENTER;
+import static android.view.Gravity.CENTER_HORIZONTAL;
+import org.briarproject.R;
+import android.content.Context;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.ProgressBar;
+import android.widget.TextView;
+
+class WaitForContactView extends AddContactView {
+
+	WaitForContactView(Context ctx) {
+		super(ctx);
+	}
+
+	void populate() {
+		removeAllViews();
+		Context ctx = getContext();
+		LinearLayout innerLayout = new LinearLayout(ctx);
+		innerLayout.setOrientation(HORIZONTAL);
+		innerLayout.setGravity(CENTER);
+
+		ImageView icon = new ImageView(ctx);
+		icon.setImageResource(R.drawable.navigation_accept);
+		innerLayout.addView(icon);
+
+		TextView connected = new TextView(ctx);
+		connected.setTextSize(22);
+		connected.setPadding(10, 10, 10, 10);
+		connected.setText(R.string.connected_to_contact);
+		innerLayout.addView(connected);
+		addView(innerLayout);
+
+		TextView yourCode = new TextView(ctx);
+		yourCode.setGravity(CENTER_HORIZONTAL);
+		yourCode.setTextSize(14);
+		yourCode.setPadding(10, 0, 10, 10);
+		yourCode.setText(R.string.your_confirmation_code);
+		addView(yourCode);
+
+		TextView code = new TextView(ctx);
+		code.setGravity(CENTER_HORIZONTAL);
+		code.setTextSize(50);
+		code.setPadding(10, 0, 10, 10);
+		int localCode = container.getLocalConfirmationCode();
+		code.setText(String.format("%06d", localCode));
+		addView(code);
+
+		innerLayout = new LinearLayout(ctx);
+		innerLayout.setOrientation(HORIZONTAL);
+		innerLayout.setGravity(CENTER);
+
+		ProgressBar progress = new ProgressBar(ctx);
+		progress.setIndeterminate(true);
+		progress.setPadding(10, 10, 10, 10);
+		innerLayout.addView(progress);
+
+		TextView connecting = new TextView(ctx);
+		connecting.setText(R.string.waiting_for_contact);
+		innerLayout.addView(connecting);
+		addView(innerLayout);
+	}
+}

briar-android/src/org/briarproject/android/invitation/WifiStatusView.java

@@ -0,0 +1,92 @@
+package org.briarproject.android.invitation;
+
+import static android.content.Context.WIFI_SERVICE;
+import static android.provider.Settings.ACTION_WIFI_SETTINGS;
+import static android.view.Gravity.CENTER;
+import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP_1;
+import org.briarproject.R;
+import android.content.Context;
+import android.content.Intent;
+import android.net.wifi.WifiInfo;
+import android.net.wifi.WifiManager;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.ImageButton;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+class WifiStatusView extends LinearLayout implements OnClickListener {
+
+	public WifiStatusView(Context ctx) {
+		super(ctx);
+	}
+
+	void init() {
+		setOrientation(HORIZONTAL);
+		setGravity(CENTER);
+		populate();
+	}
+
+	void populate() {
+		removeAllViews();
+		Context ctx = getContext();
+		TextView status = new TextView(ctx);
+		status.setTextSize(14);
+		status.setPadding(10, 10, 10, 10);
+		status.setLayoutParams(WRAP_WRAP_1);
+		WifiManager wifi = (WifiManager) ctx.getSystemService(WIFI_SERVICE);
+		if(wifi == null) {
+			ImageView warning = new ImageView(ctx);
+			warning.setPadding(5, 5, 5, 5);
+			warning.setImageResource(R.drawable.alerts_and_states_warning);
+			addView(warning);
+			status.setText(R.string.wifi_not_available);
+			addView(status);
+		} else if(wifi.isWifiEnabled()) { 
+			WifiInfo info = wifi.getConnectionInfo();
+			String networkName =  info.getSSID();
+			int networkId = info.getNetworkId();
+			if(networkName == null || networkId == -1) {
+				ImageView warning = new ImageView(ctx);
+				warning.setPadding(5, 5, 5, 5);
+				warning.setImageResource(R.drawable.alerts_and_states_warning);
+				addView(warning);
+				status.setText(R.string.wifi_disconnected);
+				addView(status);
+				ImageButton settings = new ImageButton(ctx);
+				settings.setImageResource(R.drawable.action_settings);
+				settings.setOnClickListener(this);
+				addView(settings);
+			} else {
+				ImageView ok = new ImageView(ctx);
+				ok.setPadding(5, 5, 5, 5);
+				ok.setImageResource(R.drawable.navigation_accept);
+				addView(ok);
+				String format = getResources().getString(
+						R.string.format_wifi_connected);
+				status.setText(String.format(format, networkName));
+				addView(status);
+				ImageButton settings = new ImageButton(ctx);
+				settings.setImageResource(R.drawable.action_settings);
+				settings.setOnClickListener(this);
+				addView(settings);
+			}
+		} else {
+			ImageView warning = new ImageView(ctx);
+			warning.setPadding(5, 5, 5, 5);
+			warning.setImageResource(R.drawable.alerts_and_states_warning);
+			addView(warning);
+			status.setText(R.string.wifi_disabled);
+			addView(status);
+			ImageButton settings = new ImageButton(ctx);
+			settings.setImageResource(R.drawable.action_settings);
+			settings.setOnClickListener(this);
+			addView(settings);
+		}
+	}
+
+	public void onClick(View view) {
+		getContext().startActivity(new Intent(ACTION_WIFI_SETTINGS));
+	}
+}

briar-android/src/org/briarproject/android/util/CommonLayoutParams.java

@@ -0,0 +1,23 @@
+package org.briarproject.android.util;
+
+import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
+import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
+import android.widget.LinearLayout;
+
+public class CommonLayoutParams {
+
+	public static final LinearLayout.LayoutParams MATCH_MATCH =
+			new LinearLayout.LayoutParams(MATCH_PARENT, MATCH_PARENT);
+
+	public static final LinearLayout.LayoutParams MATCH_WRAP =
+			new LinearLayout.LayoutParams(MATCH_PARENT, WRAP_CONTENT);
+
+	public static final LinearLayout.LayoutParams MATCH_WRAP_1 =
+			new LinearLayout.LayoutParams(MATCH_PARENT, WRAP_CONTENT, 1);
+
+	public static final LinearLayout.LayoutParams WRAP_WRAP =
+			new LinearLayout.LayoutParams(WRAP_CONTENT, WRAP_CONTENT);
+
+	public static final LinearLayout.LayoutParams WRAP_WRAP_1 =
+			new LinearLayout.LayoutParams(WRAP_CONTENT, WRAP_CONTENT, 1);
+}

briar-android/src/org/briarproject/android/util/HorizontalBorder.java

@@ -0,0 +1,19 @@
+package org.briarproject.android.util;
+
+import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
+import org.briarproject.R;
+import android.content.Context;
+import android.content.res.Resources;
+import android.view.View;
+import android.widget.LinearLayout.LayoutParams;
+
+public class HorizontalBorder extends View {
+
+	public HorizontalBorder(Context ctx) {
+		super(ctx);
+		Resources res = ctx.getResources();
+		int width = res.getInteger(R.integer.horizontal_border_width);
+		setLayoutParams(new LayoutParams(MATCH_PARENT, width));
+		setBackgroundColor(getResources().getColor(R.color.horizontal_border));
+	}
+}

briar-android/src/org/briarproject/android/util/HorizontalSpace.java

@@ -0,0 +1,14 @@
+package org.briarproject.android.util;
+
+import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
+import android.content.Context;
+import android.view.View;
+import android.widget.LinearLayout.LayoutParams;
+
+public class HorizontalSpace extends View {
+
+	public HorizontalSpace(Context ctx) {
+		super(ctx);
+		setLayoutParams(new LayoutParams(WRAP_CONTENT, 0, 1));
+	}
+}

briar-android/src/org/briarproject/android/util/ListLoadingProgressBar.java

@@ -0,0 +1,21 @@
+package org.briarproject.android.util;
+
+import static android.view.Gravity.CENTER;
+import static org.briarproject.android.util.CommonLayoutParams.MATCH_WRAP_1;
+import static org.briarproject.android.util.CommonLayoutParams.WRAP_WRAP;
+import android.content.Context;
+import android.widget.LinearLayout;
+import android.widget.ProgressBar;
+
+public class ListLoadingProgressBar extends LinearLayout {
+
+	public ListLoadingProgressBar(Context ctx) {
+		super(ctx);
+		setLayoutParams(MATCH_WRAP_1);
+		setGravity(CENTER);
+		ProgressBar progress = new ProgressBar(ctx);
+		progress.setLayoutParams(WRAP_WRAP);
+		progress.setIndeterminate(true);
+		addView(progress);
+	}
+}