Merge branch '41-alias-frontend' into 'master'

Add UI for changing contact aliases

Closes #41

See merge request briar/briar!965

briar-android/build.gradle

@@ -105,6 +105,7 @@ dependencies {
 	implementation "com.android.support:cardview-v7:$supportVersion"
 	implementation "com.android.support:support-annotations:$supportVersion"
 	implementation 'com.android.support.constraint:constraint-layout:1.1.3'
+	implementation "android.arch.lifecycle:extensions:1.1.1"
 
 	implementation('ch.acra:acra:4.11') {
 		exclude module: 'support-v4'

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

@@ -1,5 +1,7 @@
 package org.briarproject.briar.android;
 
+import android.arch.lifecycle.ViewModelProvider;
+
 import org.briarproject.bramble.BrambleAndroidModule;
 import org.briarproject.bramble.BrambleCoreEagerSingletons;
 import org.briarproject.bramble.BrambleCoreModule;
@@ -154,6 +156,8 @@ public interface AndroidComponent
 
 	CircumventionProvider circumventionProvider();
 
+	ViewModelProvider.Factory viewModelFactory();
+
 	void inject(SignInReminderReceiver briarService);
 
 	void inject(BriarService briarService);

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

@@ -32,6 +32,7 @@ import org.briarproject.bramble.plugin.tor.CircumventionProvider;
 import org.briarproject.bramble.util.AndroidUtils;
 import org.briarproject.bramble.util.StringUtils;
 import org.briarproject.briar.android.account.LockManagerImpl;
+import org.briarproject.briar.android.viewmodel.ViewModelModule;
 import org.briarproject.briar.api.android.AndroidNotificationManager;
 import org.briarproject.briar.api.android.DozeWatchdog;
 import org.briarproject.briar.api.android.LockManager;
@@ -57,7 +58,7 @@ import static java.util.Collections.emptyList;
 import static org.briarproject.bramble.api.reporting.ReportingConstants.DEV_ONION_ADDRESS;
 import static org.briarproject.bramble.api.reporting.ReportingConstants.DEV_PUBLIC_KEY_HEX;
 
-@Module
+@Module(includes = ViewModelModule.class)
 public class AppModule {
 
 	static class EagerSingletons {

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

@@ -15,6 +15,7 @@ import org.briarproject.briar.android.blog.ReblogFragment;
 import org.briarproject.briar.android.blog.RssFeedImportActivity;
 import org.briarproject.briar.android.blog.RssFeedManageActivity;
 import org.briarproject.briar.android.blog.WriteBlogPostActivity;
+import org.briarproject.briar.android.contact.AliasDialogFragment;
 import org.briarproject.briar.android.contact.ContactListFragment;
 import org.briarproject.briar.android.contact.ContactModule;
 import org.briarproject.briar.android.contact.ConversationActivity;
@@ -211,4 +212,7 @@ public interface ActivityComponent {
 	void inject(ScreenFilterDialogFragment fragment);
 
 	void inject(ContactExchangeErrorFragment fragment);
+
+	void inject(AliasDialogFragment aliasDialogFragment);
+
 }

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

@@ -0,0 +1,72 @@
+package org.briarproject.briar.android.contact;
+
+import android.arch.lifecycle.ViewModelProvider;
+import android.arch.lifecycle.ViewModelProviders;
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.v7.app.AppCompatDialogFragment;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.EditText;
+
+import org.briarproject.bramble.api.contact.Contact;
+import org.briarproject.briar.R;
+import org.briarproject.briar.android.activity.BriarActivity;
+
+import javax.inject.Inject;
+
+import static java.util.Objects.requireNonNull;
+
+public class AliasDialogFragment extends AppCompatDialogFragment {
+
+	final static String TAG = AliasDialogFragment.class.getName();
+
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+
+	private ConversationViewModel viewModel;
+	private EditText aliasEditText;
+
+	public static AliasDialogFragment newInstance() {
+		return new AliasDialogFragment();
+	}
+
+	@Override
+	public void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+
+		setStyle(STYLE_NO_TITLE, R.style.BriarDialogTheme);
+
+		if (getActivity() == null) return;
+		((BriarActivity) getActivity()).getActivityComponent().inject(this);
+		viewModel = ViewModelProviders.of(getActivity(), viewModelFactory)
+				.get(ConversationViewModel.class);
+	}
+
+	@Override
+	public View onCreateView(@NonNull LayoutInflater inflater,
+			ViewGroup container, Bundle savedInstanceState) {
+
+		View v = inflater.inflate(R.layout.fragment_alias_dialog, container,
+				false);
+
+		aliasEditText = v.findViewById(R.id.aliasEditText);
+		Contact contact = requireNonNull(viewModel.getContact().getValue());
+		String alias = contact.getAlias();
+		aliasEditText.setText(alias);
+		if (alias != null) aliasEditText.setSelection(alias.length());
+
+		Button setButton = v.findViewById(R.id.setButton);
+		setButton.setOnClickListener(v1 -> {
+			viewModel.setContactAlias(aliasEditText.getText().toString());
+			getDialog().dismiss();
+		});
+
+		Button cancelButton = v.findViewById(R.id.cancelButton);
+		cancelButton.setOnClickListener(v1 -> getDialog().cancel());
+
+		return v;
+	}
+}

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

@@ -1,7 +1,8 @@
 package org.briarproject.briar.android.contact;
 
-import android.arch.lifecycle.MutableLiveData;
 import android.arch.lifecycle.Observer;
+import android.arch.lifecycle.ViewModelProvider;
+import android.arch.lifecycle.ViewModelProviders;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.Bundle;
@@ -23,7 +24,6 @@ import android.widget.TextView;
 import android.widget.Toast;
 
 import org.briarproject.bramble.api.FormatException;
-import org.briarproject.bramble.api.contact.Contact;
 import org.briarproject.bramble.api.contact.ContactId;
 import org.briarproject.bramble.api.contact.ContactManager;
 import org.briarproject.bramble.api.contact.event.ContactRemovedEvent;
@@ -34,7 +34,6 @@ import org.briarproject.bramble.api.db.NoSuchContactException;
 import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.event.EventBus;
 import org.briarproject.bramble.api.event.EventListener;
-import org.briarproject.bramble.api.identity.AuthorId;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.bramble.api.plugin.ConnectionRegistry;
@@ -96,6 +95,7 @@ import uk.co.samuelwall.materialtaptargetprompt.MaterialTapTargetPrompt.PromptSt
 import static android.support.v4.view.ViewCompat.setTransitionName;
 import static android.support.v7.util.SortedList.INVALID_POSITION;
 import static android.widget.Toast.LENGTH_SHORT;
+import static java.util.Objects.requireNonNull;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Level.WARNING;
 import static org.briarproject.bramble.util.LogUtils.logDuration;
@@ -105,6 +105,7 @@ import static org.briarproject.briar.android.activity.RequestCodes.REQUEST_INTRO
 import static org.briarproject.briar.android.settings.SettingsFragment.SETTINGS_NAMESPACE;
 import static org.briarproject.briar.android.util.UiUtils.getAvatarTransitionName;
 import static org.briarproject.briar.android.util.UiUtils.getBulbTransitionName;
+import static org.briarproject.briar.android.util.UiUtils.observeOnce;
 import static org.briarproject.briar.api.messaging.MessagingConstants.MAX_PRIVATE_MESSAGE_TEXT_LENGTH;
 import static uk.co.samuelwall.materialtaptargetprompt.MaterialTapTargetPrompt.STATE_DISMISSED;
 import static uk.co.samuelwall.materialtaptargetprompt.MaterialTapTargetPrompt.STATE_FINISHED;
@@ -131,8 +132,8 @@ public class ConversationActivity extends BriarActivity
 	Executor cryptoExecutor;
 
 	private final Map<MessageId, String> textCache = new ConcurrentHashMap<>();
-	private final MutableLiveData<String> contactName = new MutableLiveData<>();
 
+	private ConversationViewModel viewModel;
 	private ConversationVisitor visitor;
 	private ConversationAdapter adapter;
 	private Toolbar toolbar;
@@ -163,14 +164,18 @@ public class ConversationActivity extends BriarActivity
 	volatile BlogSharingManager blogSharingManager;
 	@Inject
 	volatile GroupInvitationManager groupInvitationManager;
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
 
 	private volatile ContactId contactId;
 	@Nullable
-	private volatile AuthorId contactAuthorId;
-	@Nullable
 	private volatile GroupId messagingGroupId;
 
-	@SuppressWarnings("ConstantConditions")
+	private final Observer<String> contactNameObserver = name -> {
+		requireNonNull(name);
+		loadMessages();
+	};
+
 	@Override
 	public void onCreate(@Nullable Bundle state) {
 		setSceneTransitionAnimation();
@@ -181,20 +186,37 @@ public class ConversationActivity extends BriarActivity
 		if (id == -1) throw new IllegalStateException();
 		contactId = new ContactId(id);
 
+		viewModel = ViewModelProviders.of(this, viewModelFactory)
+				.get(ConversationViewModel.class);
+		viewModel.setContactId(contactId);
+
 		setContentView(R.layout.activity_conversation);
 
 		// Custom Toolbar
-		toolbar = setUpCustomToolbar(true);
-		if (toolbar != null) {
-			toolbarAvatar = toolbar.findViewById(R.id.contactAvatar);
-			toolbarStatus = toolbar.findViewById(R.id.contactStatus);
-			toolbarTitle = toolbar.findViewById(R.id.contactName);
-		}
+		toolbar = requireNonNull(setUpCustomToolbar(true));
+		toolbarAvatar = toolbar.findViewById(R.id.contactAvatar);
+		toolbarStatus = toolbar.findViewById(R.id.contactStatus);
+		toolbarTitle = toolbar.findViewById(R.id.contactName);
+
+		observeOnce(viewModel.getContactAuthorId(), this, authorId -> {
+			requireNonNull(authorId);
+			toolbarAvatar.setImageDrawable(
+					new IdenticonDrawable(authorId.getBytes()));
+		});
+		viewModel.getContactDisplayName().observe(this, contactName -> {
+			requireNonNull(contactName);
+			toolbarTitle.setText(contactName);
+		});
+		viewModel.isContactDeleted().observe(this, deleted -> {
+			requireNonNull(deleted);
+			if (deleted) finish();
+		});
 
 		setTransitionName(toolbarAvatar, getAvatarTransitionName(contactId));
 		setTransitionName(toolbarStatus, getBulbTransitionName(contactId));
 
-		visitor = new ConversationVisitor(this, this, contactName);
+		visitor = new ConversationVisitor(this, this,
+				viewModel.getContactDisplayName());
 		adapter = new ConversationAdapter(this, this);
 		list = findViewById(R.id.conversationView);
 		list.setLayoutManager(new LinearLayoutManager(this));
@@ -229,7 +251,7 @@ public class ConversationActivity extends BriarActivity
 		notificationManager.blockContactNotification(contactId);
 		notificationManager.clearContactNotification(contactId);
 		displayContactOnlineStatus();
-		loadContactDetailsAndMessages();
+		viewModel.getContactDisplayName().observe(this, contactNameObserver);
 		list.startPeriodicUpdate();
 	}
 
@@ -238,6 +260,7 @@ public class ConversationActivity extends BriarActivity
 		super.onStop();
 		eventBus.removeListener(this);
 		notificationManager.unblockContactNotification(contactId);
+		viewModel.getContactDisplayName().removeObserver(contactNameObserver);
 		list.stopPeriodicUpdate();
 	}
 
@@ -249,6 +272,8 @@ public class ConversationActivity extends BriarActivity
 
 		enableIntroductionActionIfAvailable(
 				menu.findItem(R.id.action_introduction));
+		enableAliasActionIfAvailable(
+				menu.findItem(R.id.action_set_alias));
 
 		return super.onCreateOptionsMenu(menu);
 	}
@@ -266,6 +291,10 @@ public class ConversationActivity extends BriarActivity
 				intent.putExtra(CONTACT_ID, contactId.getInt());
 				startActivityForResult(intent, REQUEST_INTRODUCTION);
 				return true;
+			case R.id.action_set_alias:
+				AliasDialogFragment.newInstance().show(
+						getSupportFragmentManager(), AliasDialogFragment.TAG);
+				return true;
 			case R.id.action_social_remove_person:
 				askToRemoveContact();
 				return true;
@@ -274,36 +303,6 @@ public class ConversationActivity extends BriarActivity
 		}
 	}
 
-	private void loadContactDetailsAndMessages() {
-		runOnDbThread(() -> {
-			try {
-				long start = now();
-				if (contactAuthorId == null) {
-					Contact contact = contactManager.getContact(contactId);
-					contactName.postValue(contact.getAuthor().getName());
-					contactAuthorId = contact.getAuthor().getId();
-				}
-				logDuration(LOG, "Loading contact", start);
-				loadMessages();
-				displayContactDetails();
-			} catch (NoSuchContactException e) {
-				finishOnUiThread();
-			} catch (DbException e) {
-				logException(LOG, WARNING, e);
-			}
-		});
-	}
-
-	// contactAuthorId and contactName are expected to be set
-	private void displayContactDetails() {
-		runOnUiThreadUnlessDestroyed(() -> {
-			//noinspection ConstantConditions
-			toolbarAvatar.setImageDrawable(
-					new IdenticonDrawable(contactAuthorId.getBytes()));
-			toolbarTitle.setText(contactName.getValue());
-		});
-	}
-
 	private void displayContactOnlineStatus() {
 		runOnUiThreadUnlessDestroyed(() -> {
 			if (connectionRegistry.isConnected(contactId)) {
@@ -453,21 +452,9 @@ public class ConversationActivity extends BriarActivity
 	private void onNewPrivateMessage(PrivateMessageHeader h) {
 		runOnUiThreadUnlessDestroyed(() -> {
 			if (h instanceof PrivateRequest || h instanceof PrivateResponse) {
-				String cName = contactName.getValue();
-				if (cName == null) {
-					// Wait for the contact name to be loaded
-					contactName.observe(this, new Observer<String>() {
-						@Override
-						public void onChanged(@Nullable String cName) {
-							if (cName != null) {
-								addConversationItem(h.accept(visitor));
-								contactName.removeObserver(this);
-							}
-						}
-					});
-				} else {
-					addConversationItem(h.accept(visitor));
-				}
+				// contact name might not have been loaded
+				observeOnce(viewModel.getContactDisplayName(), this,
+						name -> addConversationItem(h.accept(visitor)));
 			} else {
 				addConversationItem(h.accept(visitor));
 				loadMessageText(h.getId());
@@ -605,6 +592,10 @@ public class ConversationActivity extends BriarActivity
 		});
 	}
 
+	private void enableAliasActionIfAvailable(MenuItem item) {
+		observeOnce(viewModel.getContact(), this, c -> item.setEnabled(true));
+	}
+
 	private void enableIntroductionAction(MenuItem item) {
 		runOnUiThreadUnlessDestroyed(() -> item.setEnabled(true));
 	}

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

@@ -0,0 +1,115 @@
+package org.briarproject.briar.android.contact;
+
+import android.app.Application;
+import android.arch.lifecycle.AndroidViewModel;
+import android.arch.lifecycle.LiveData;
+import android.arch.lifecycle.MutableLiveData;
+import android.arch.lifecycle.Transformations;
+import android.support.annotation.Nullable;
+
+import org.briarproject.bramble.api.contact.Contact;
+import org.briarproject.bramble.api.contact.ContactId;
+import org.briarproject.bramble.api.contact.ContactManager;
+import org.briarproject.bramble.api.db.DatabaseExecutor;
+import org.briarproject.bramble.api.db.DbException;
+import org.briarproject.bramble.api.db.NoSuchContactException;
+import org.briarproject.bramble.api.identity.AuthorId;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.briar.android.util.UiUtils;
+
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import static java.util.Objects.requireNonNull;
+import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
+import static org.briarproject.bramble.util.LogUtils.logDuration;
+import static org.briarproject.bramble.util.LogUtils.logException;
+import static org.briarproject.bramble.util.LogUtils.now;
+
+@NotNullByDefault
+public class ConversationViewModel extends AndroidViewModel {
+
+	private static Logger LOG =
+			getLogger(ConversationViewModel.class.getName());
+
+	@DatabaseExecutor
+	private final Executor dbExecutor;
+	private final ContactManager contactManager;
+
+	@Nullable
+	private ContactId contactId = null;
+	private final MutableLiveData<Contact> contact = new MutableLiveData<>();
+	private final LiveData<AuthorId> contactAuthorId =
+			Transformations.map(contact, c -> c.getAuthor().getId());
+	private final LiveData<String> contactName =
+			Transformations.map(contact, UiUtils::getContactDisplayName);
+	private final MutableLiveData<Boolean> contactDeleted =
+			new MutableLiveData<>();
+
+	@Inject
+	ConversationViewModel(Application application,
+			@DatabaseExecutor Executor dbExecutor,
+			ContactManager contactManager) {
+		super(application);
+		this.dbExecutor = dbExecutor;
+		this.contactManager = contactManager;
+		contactDeleted.setValue(false);
+	}
+
+	void setContactId(ContactId contactId) {
+		if (this.contactId == null) {
+			this.contactId = contactId;
+			loadContact();
+		} else if (!contactId.equals(this.contactId)) {
+			throw new IllegalStateException();
+		}
+	}
+
+	private void loadContact() {
+		dbExecutor.execute(() -> {
+			try {
+				long start = now();
+				Contact c =
+						contactManager.getContact(requireNonNull(contactId));
+				contact.postValue(c);
+				logDuration(LOG, "Loading contact", start);
+			} catch (NoSuchContactException e) {
+				contactDeleted.postValue(true);
+			} catch (DbException e) {
+				logException(LOG, WARNING, e);
+			}
+		});
+	}
+
+	void setContactAlias(String alias) {
+		dbExecutor.execute(() -> {
+			try {
+				contactManager.setContactAlias(requireNonNull(contactId),
+						alias.isEmpty() ? null : alias);
+				loadContact();
+			} catch (DbException e) {
+				logException(LOG, WARNING, e);
+			}
+		});
+	}
+
+	LiveData<Contact> getContact() {
+		return contact;
+	}
+
+	LiveData<AuthorId> getContactAuthorId() {
+		return contactAuthorId;
+	}
+
+	LiveData<String> getContactDisplayName() {
+		return contactName;
+	}
+
+	LiveData<Boolean> isContactDeleted() {
+		return contactDeleted;
+	}
+
+}

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

@@ -3,6 +3,9 @@ package org.briarproject.briar.android.util;
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.app.KeyguardManager;
+import android.arch.lifecycle.LifecycleOwner;
+import android.arch.lifecycle.LiveData;
+import android.arch.lifecycle.Observer;
 import android.content.Context;
 import android.content.DialogInterface.OnClickListener;
 import android.content.Intent;
@@ -11,6 +14,7 @@ import android.os.PowerManager;
 import android.support.annotation.AttrRes;
 import android.support.annotation.ColorInt;
 import android.support.annotation.ColorRes;
+import android.support.annotation.MainThread;
 import android.support.annotation.Nullable;
 import android.support.design.widget.TextInputLayout;
 import android.support.v4.app.FragmentManager;
@@ -314,4 +318,21 @@ public class UiUtils {
 				keyEvent.getKeyCode() == KEYCODE_ENTER;
 	}
 
+	/**
+	 * Observes the given {@link LiveData} until the first change.
+	 * If the LiveData's value is available, the {@link Observer} will be
+	 * called right away.
+	 */
+	@MainThread
+	public static <T> void observeOnce(LiveData<T> liveData,
+			LifecycleOwner owner, Observer<T> observer) {
+		liveData.observe(owner, new Observer<T>() {
+			@Override
+			public void onChanged(@Nullable T t) {
+				observer.onChanged(t);
+				liveData.removeObserver(this);
+			}
+		});
+	}
+
 }

briar-android/src/main/java/org/briarproject/briar/android/viewmodel/ViewModelFactory.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.briarproject.briar.android.viewmodel;
+
+import android.arch.lifecycle.ViewModel;
+import android.arch.lifecycle.ViewModelProvider;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import java.util.Map;
+import java.util.Map.Entry;
+
+import javax.inject.Inject;
+import javax.inject.Provider;
+import javax.inject.Singleton;
+
+@Singleton
+@NotNullByDefault
+class ViewModelFactory implements ViewModelProvider.Factory {
+
+	private final Map<Class<? extends ViewModel>, Provider<ViewModel>> creators;
+
+	@Inject
+	ViewModelFactory(Map<Class<? extends ViewModel>,
+			Provider<ViewModel>> creators) {
+		this.creators = creators;
+	}
+
+	@Override
+	public <T extends ViewModel> T create(Class<T> modelClass) {
+		Provider<? extends ViewModel> creator = creators.get(modelClass);
+		if (creator == null) {
+			for (Entry<Class<? extends ViewModel>, Provider<ViewModel>> entry :
+					creators.entrySet()) {
+				if (modelClass.isAssignableFrom(entry.getKey())) {
+					creator = entry.getValue();
+					break;
+				}
+			}
+		}
+		if (creator == null) {
+			throw new IllegalArgumentException(
+					"unknown model class " + modelClass);
+		}
+		//noinspection unchecked
+		return (T) creator.get();
+	}
+
+}

briar-android/src/main/java/org/briarproject/briar/android/viewmodel/ViewModelKey.java

@@ -0,0 +1,19 @@
+package org.briarproject.briar.android.viewmodel;
+
+import android.arch.lifecycle.ViewModel;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import dagger.MapKey;
+
+@Documented
+@Target({ElementType.METHOD})
+@Retention(RetentionPolicy.RUNTIME)
+@MapKey
+@interface ViewModelKey {
+	Class<? extends ViewModel> value();
+}

briar-android/src/main/java/org/briarproject/briar/android/viewmodel/ViewModelModule.java

@@ -0,0 +1,28 @@
+package org.briarproject.briar.android.viewmodel;
+
+import android.arch.lifecycle.ViewModel;
+import android.arch.lifecycle.ViewModelProvider;
+
+import org.briarproject.briar.android.contact.ConversationViewModel;
+
+import javax.inject.Singleton;
+
+import dagger.Binds;
+import dagger.Module;
+import dagger.multibindings.IntoMap;
+
+@Module
+public abstract class ViewModelModule {
+
+	@Binds
+	@IntoMap
+	@ViewModelKey(ConversationViewModel.class)
+	abstract ViewModel bindConversationViewModel(
+			ConversationViewModel conversationViewModel);
+
+	@Binds
+	@Singleton
+	abstract ViewModelProvider.Factory bindViewModelFactory(
+			ViewModelFactory viewModelFactory);
+
+}

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

@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	android:layout_width="match_parent"
+	android:layout_height="wrap_content"
+	android:orientation="vertical"
+	android:paddingLeft="16dp"
+	android:paddingRight="16dp"
+	android:paddingTop="16dp">
+
+	<TextView
+		android:id="@+id/titleView"
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		android:text="@string/set_contact_alias"
+		android:textColor="?android:attr/textColorPrimary"
+		android:textSize="@dimen/text_size_large"
+		android:textStyle="bold"/>
+
+	<EditText
+		android:id="@+id/aliasEditText"
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		android:layout_marginTop="16dp"
+		android:hint="@string/set_contact_alias_hint"
+		android:inputType="textPersonName"
+		android:textColor="?android:attr/textColorPrimary"
+		android:textSize="@dimen/text_size_medium"/>
+
+	<LinearLayout
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		android:layout_marginLeft="@dimen/margin_xxlarge"
+		android:layout_marginStart="@dimen/margin_xxlarge"
+		android:gravity="end"
+		android:orientation="horizontal">
+
+		<Button
+			android:id="@+id/cancelButton"
+			style="@style/BriarButtonFlat.Negative"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:text="@string/cancel"/>
+
+		<Button
+			android:id="@+id/setButton"
+			style="@style/BriarButtonFlat.Positive"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:text="@string/set_alias"/>
+
+	</LinearLayout>
+
+</LinearLayout>

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

@@ -1,75 +1,69 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout
 	xmlns:android="http://schemas.android.com/apk/res/android"
-	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
-	android:layout_height="match_parent"
-	android:orientation="vertical">
+	android:layout_height="wrap_content"
+	android:orientation="vertical"
+	android:padding="16dp">
+
+	<TextView
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		android:text="@string/link_warning_title"
+		android:textColor="?android:attr/textColorPrimary"
+		android:textSize="@dimen/text_size_large"
+		android:textStyle="bold"/>
+
+	<TextView
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		android:layout_marginTop="@dimen/margin_large"
+		android:text="@string/link_warning_intro"
+		android:textColor="?android:attr/textColorPrimary"
+		android:textSize="@dimen/text_size_medium"/>
+
+	<TextView
+		android:id="@+id/urlView"
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		android:layout_marginTop="@dimen/margin_large"
+		android:textColor="?android:attr/textColorPrimary"
+		android:textIsSelectable="true"
+		android:textSize="@dimen/text_size_medium"
+		android:typeface="monospace"
+		tools:text="http://very.bad.site.com"/>
+
+	<TextView
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		android:layout_marginTop="@dimen/margin_large"
+		android:text="@string/link_warning_text"
+		android:textColor="?android:attr/textColorPrimary"
+		android:textSize="@dimen/text_size_medium"/>
 
 	<LinearLayout
-		android:layout_width="wrap_content"
-		android:layout_height="wrap_content"
-		android:orientation="vertical"
-		android:padding="@dimen/margin_large">
-
-		<TextView
-			android:layout_width="match_parent"
-			android:layout_height="wrap_content"
-			android:text="@string/link_warning_title"
-			android:textColor="?android:attr/textColorPrimary"
-			android:textSize="@dimen/text_size_large"
-			android:textStyle="bold"/>
-
-		<TextView
-			android:layout_width="match_parent"
-			android:layout_height="wrap_content"
-			android:layout_marginTop="@dimen/margin_large"
-			android:text="@string/link_warning_intro"
-			android:textColor="?android:attr/textColorPrimary"
-			android:textSize="@dimen/text_size_medium"/>
-
-		<TextView
-			android:id="@+id/urlView"
-			android:layout_width="match_parent"
-			android:layout_height="wrap_content"
-			android:layout_marginTop="@dimen/margin_large"
-			android:textIsSelectable="true"
-			android:typeface="monospace"
-			tools:text="http://very.bad.site.com"/>
-
-		<TextView
-			android:layout_width="match_parent"
-			android:layout_height="wrap_content"
-			android:layout_marginTop="@dimen/margin_large"
-			android:text="@string/link_warning_text"
-			android:textColor="?android:attr/textColorPrimary"
-			android:textSize="@dimen/text_size_medium"/>
-
-	</LinearLayout>
-
-	<android.support.constraint.ConstraintLayout
 		android:layout_width="match_parent"
-		android:layout_height="@dimen/button_size">
+		android:layout_height="wrap_content"
+		android:layout_marginLeft="@dimen/margin_xxlarge"
+		android:layout_marginStart="@dimen/margin_xxlarge"
+		android:gravity="end"
+		android:orientation="horizontal">
 
 		<Button
 			android:id="@+id/cancelButton"
 			style="@style/BriarButtonFlat.Positive"
-			android:layout_width="0dp"
+			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
-			android:text="@string/cancel"
-			app:layout_constraintEnd_toStartOf="@+id/openButton"
-			app:layout_constraintStart_toStartOf="parent"/>
+			android:text="@string/cancel"/>
 
 		<Button
 			android:id="@+id/openButton"
 			style="@style/BriarButtonFlat.Negative"
-			android:layout_width="0dp"
+			android:layout_width="wrap_content"
 			android:layout_height="wrap_content"
-			android:text="@string/link_warning_open_link"
-			app:layout_constraintEnd_toEndOf="parent"
-			app:layout_constraintStart_toEndOf="@+id/cancelButton"/>
+			android:text="@string/link_warning_open_link"/>
 
-	</android.support.constraint.ConstraintLayout>
+	</LinearLayout>
 
 </LinearLayout>

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

@@ -10,6 +10,12 @@
 		android:enabled="false"
 		app:showAsAction="never"/>
 
+	<item
+		android:id="@+id/action_set_alias"
+		android:title="@string/set_contact_alias"
+		android:enabled="false"
+		app:showAsAction="never"/>
+
 	<item
 		android:id="@+id/action_social_remove_person"
 		android:icon="@drawable/action_delete_white"

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

@@ -127,6 +127,9 @@
 	<string name="date_no_private_messages">No messages.</string>
 	<string name="no_private_messages">No messages to show</string>
 	<string name="message_hint">Type message</string>
+	<string name="set_contact_alias">Change contact name</string>
+	<string name="set_contact_alias_hint">Contact name</string>
+	<string name="set_alias">Set</string>
 	<string name="delete_contact">Delete contact</string>
 	<string name="dialog_title_delete_contact">Confirm Contact Deletion</string>
 	<string name="dialog_message_delete_contact">Are you sure that you want to remove this contact and all messages exchanged with this contact?</string>

briar-android/witness.gradle

@@ -3,6 +3,7 @@ dependencyVerification {
         'android.arch.core:common:1.1.1:common-1.1.1.jar:3a616a32f433e9e23f556b38575c31b013613d3ae85206263b7625fe1f4c151a',
         'android.arch.core:runtime:1.1.1:runtime-1.1.1.aar:c3215aa5873311b3f88a6f4e4a3c25ad89971bc127de8c3e1291c57f93a05c39',
         'android.arch.lifecycle:common:1.1.1:common-1.1.1.jar:8d378e88ebd5189e09eef623414812c868fd90aa519d6160e2311fb8b81cff56',
+        'android.arch.lifecycle:extensions:1.1.1:extensions-1.1.1.aar:429426b2feec2245ffc5e75b3b5309bedb36159cf06dc71843ae43526ac289b6',
         'android.arch.lifecycle:livedata-core:1.1.1:livedata-core-1.1.1.aar:d6fdd8b985d6178d7ea2f16986a24e83f1bee936b74d43167c69e08d3cc12c50',
         'android.arch.lifecycle:livedata:1.1.1:livedata-1.1.1.aar:50ab0490c1ff1a7cfb4e554032998b080888946d0dd424f39900efc4a1bcd750',
         'android.arch.lifecycle:runtime:1.1.1:runtime-1.1.1.aar:c4e4be66c1b2f0abec593571454e1de14013f7e0f96bf2a9f212931a48cae550',