Merge branch '551-destroyable-context' into 'master'

Always check whether the context has been destroyed

#551 has the same root cause as #610, which is that when a background operation completes, we need to check whether the activity or fragment that started the operation has been destroyed before doing anything with the UI. 

DestroyableActivity has been renamed to DestroyableContext because it's now implemented by some fragments as well. Various existing listener interfaces now extend DestroyableContext.

I also modified the ActivityLifecycleController interface so the activity is passed into the onActivityCreate() method rather than being injected - @ernir please check I haven't broken anything!

Closes #551

See merge request !341

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

@@ -20,7 +20,6 @@ import org.briarproject.android.controller.PasswordController;
 import org.briarproject.android.controller.PasswordControllerImpl;
 import org.briarproject.android.controller.SetupController;
 import org.briarproject.android.controller.SetupControllerImpl;
-import org.briarproject.android.controller.TransportStateListener;
 import org.briarproject.android.forum.ForumController;
 import org.briarproject.android.forum.ForumControllerImpl;
 
@@ -52,27 +51,27 @@ public class ActivityModule {
 
 	@ActivityScope
 	@Provides
-	protected SetupController provideSetupController(
+	SetupController provideSetupController(
 			SetupControllerImpl setupControllerImpl) {
 		return setupControllerImpl;
 	}
 
 	@ActivityScope
 	@Provides
-	protected ConfigController provideConfigController(
+	ConfigController provideConfigController(
 			ConfigControllerImpl configControllerImpl) {
 		return configControllerImpl;
 	}
 
 	@ActivityScope
 	@Provides
-	protected SharedPreferences provideSharedPreferences(Activity activity) {
+	SharedPreferences provideSharedPreferences(Activity activity) {
 		return activity.getSharedPreferences("db", Context.MODE_PRIVATE);
 	}
 
 	@ActivityScope
 	@Provides
-	protected PasswordController providePasswordController(
+	PasswordController providePasswordController(
 			PasswordControllerImpl passwordControllerImpl) {
 		return passwordControllerImpl;
 	}
@@ -87,8 +86,7 @@ public class ActivityModule {
 
 	@ActivityScope
 	@Provides
-	protected DbController provideDBController(
-			DbControllerImpl dbController) {
+	DbController provideDBController(DbControllerImpl dbController) {
 		return dbController;
 	}
 
@@ -109,26 +107,21 @@ public class ActivityModule {
 
 	@ActivityScope
 	@Provides
-	protected FeedController provideFeedController(
-			FeedControllerImpl feedController) {
+	FeedController provideFeedController(FeedControllerImpl feedController) {
 		return feedController;
 	}
 
 	@ActivityScope
 	@Provides
-	protected NavDrawerController provideNavDrawerController(
-			NavDrawerControllerImpl navDrawerControllerImpl) {
-		activity.addLifecycleController(navDrawerControllerImpl);
-		if (activity instanceof TransportStateListener) {
-			navDrawerControllerImpl.setTransportListener(
-					(TransportStateListener) activity);
-		}
-		return navDrawerControllerImpl;
+	NavDrawerController provideNavDrawerController(
+			NavDrawerControllerImpl navDrawerController) {
+		activity.addLifecycleController(navDrawerController);
+		return navDrawerController;
 	}
 
 	@ActivityScope
 	@Provides
-	protected BriarServiceConnection provideBriarServiceConnection() {
+	BriarServiceConnection provideBriarServiceConnection() {
 		return new BriarServiceConnection();
 	}
 

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

@@ -2,7 +2,6 @@ package org.briarproject.android;
 
 import android.os.Bundle;
 import android.os.IBinder;
-import android.support.annotation.UiThread;
 import android.support.v7.app.AppCompatActivity;
 import android.view.View;
 import android.view.inputmethod.InputMethodManager;
@@ -18,7 +17,7 @@ import static android.view.inputmethod.InputMethodManager.SHOW_IMPLICIT;
 import static org.briarproject.android.TestingConstants.PREVENT_SCREENSHOTS;
 
 public abstract class BaseActivity extends AppCompatActivity
-		implements DestroyableActivity {
+		implements DestroyableContext {
 
 	protected ActivityComponent activityComponent;
 
@@ -49,7 +48,7 @@ public abstract class BaseActivity extends AppCompatActivity
 		injectActivity(activityComponent);
 
 		for (ActivityLifecycleController alc : lifecycleControllers) {
-			alc.onActivityCreate();
+			alc.onActivityCreate(this);
 		}
 	}
 
@@ -87,9 +86,14 @@ public abstract class BaseActivity extends AppCompatActivity
 		}
 	}
 
-	@UiThread
-	public boolean hasBeenDestroyed() {
-		return destroyed;
+	@Override
+	public void runOnUiThreadUnlessDestroyed(final Runnable r) {
+		runOnUiThread(new Runnable() {
+			@Override
+			public void run() {
+				if (!destroyed && !isFinishing()) r.run();
+			}
+		});
 	}
 
 	public void showSoftKeyboardForced(View view) {

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

@@ -94,7 +94,7 @@ public abstract class BriarActivity extends BaseActivity {
 
 	@Deprecated
 	protected void finishOnUiThread() {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				finish();

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

@@ -1,7 +1,6 @@
 package org.briarproject.android;
 
 import android.support.annotation.AnimRes;
-import android.support.v4.app.FragmentManager;
 import android.support.v4.app.FragmentTransaction;
 import android.support.v7.app.ActionBar;
 import android.support.v7.app.AlertDialog;
@@ -12,6 +11,8 @@ import org.briarproject.android.contact.ContactListFragment;
 import org.briarproject.android.forum.ForumListFragment;
 import org.briarproject.android.fragment.BaseFragment;
 
+import static android.support.v4.app.FragmentManager.POP_BACK_STACK_INCLUSIVE;
+
 /**
  * This class should be extended by classes that wish to utilise fragments in
  * Briar, it encapsulates all fragment related code.
@@ -33,11 +34,8 @@ public abstract class BriarFragmentActivity extends BriarActivity {
 	}
 
 	void clearBackStack() {
-		getSupportFragmentManager()
-				.popBackStackImmediate(
-						null,
-						FragmentManager.POP_BACK_STACK_INCLUSIVE
-				);
+		getSupportFragmentManager().popBackStackImmediate(null,
+				POP_BACK_STACK_INCLUSIVE);
 	}
 
 	@Override

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

@@ -1,12 +0,0 @@
-package org.briarproject.android;
-
-import android.support.annotation.UiThread;
-
-public interface DestroyableActivity {
-
-	void runOnUiThread(Runnable runnable);
-
-	@UiThread
-	boolean hasBeenDestroyed();
-
-}

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

@@ -0,0 +1,6 @@
+package org.briarproject.android;
+
+public interface DestroyableContext {
+
+	void runOnUiThreadUnlessDestroyed(Runnable runnable);
+}

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

@@ -27,7 +27,7 @@ import org.briarproject.android.controller.NavDrawerController;
 import org.briarproject.android.controller.TransportStateListener;
 import org.briarproject.android.controller.handler.UiResultHandler;
 import org.briarproject.android.forum.ForumListFragment;
-import org.briarproject.android.fragment.BaseFragment;
+import org.briarproject.android.fragment.BaseFragment.BaseFragmentListener;
 import org.briarproject.api.TransportId;
 import org.briarproject.api.identity.LocalAuthor;
 
@@ -43,7 +43,7 @@ import static android.support.v4.widget.DrawerLayout.LOCK_MODE_UNLOCKED;
 import static android.view.View.INVISIBLE;
 
 public class NavDrawerActivity extends BriarFragmentActivity implements
-		BaseFragment.BaseFragmentListener, TransportStateListener,
+		BaseFragmentListener, TransportStateListener,
 		OnNavigationItemSelectedListener {
 
 	static final String INTENT_CONTACTS = "intent_contacts";
@@ -58,9 +58,8 @@ public class NavDrawerActivity extends BriarFragmentActivity implements
 	private ActionBarDrawerToggle drawerToggle;
 
 	@Inject
-	protected NavDrawerController controller;
+	NavDrawerController controller;
 
-	private Toolbar toolbar;
 	private DrawerLayout drawerLayout;
 	private TextView progressTitle;
 	private ViewGroup progressViewGroup;
@@ -78,11 +77,9 @@ public class NavDrawerActivity extends BriarFragmentActivity implements
 //		clearBackStack();
 		if (intent.getBooleanExtra(INTENT_FORUMS, false)) {
 			startFragment(ForumListFragment.newInstance());
-		}
-		else if (intent.getBooleanExtra(INTENT_CONTACTS, false)) {
+		} else if (intent.getBooleanExtra(INTENT_CONTACTS, false)) {
 			startFragment(ContactListFragment.newInstance());
-		}
-		else if (intent.getBooleanExtra(INTENT_BLOGS, false)) {
+		} else if (intent.getBooleanExtra(INTENT_BLOGS, false)) {
 			startFragment(FeedFragment.newInstance());
 		}
 		setIntent(null);
@@ -100,7 +97,7 @@ public class NavDrawerActivity extends BriarFragmentActivity implements
 		exitIfStartupFailed(getIntent());
 		setContentView(R.layout.activity_nav_drawer);
 
-		toolbar = (Toolbar) findViewById(R.id.toolbar);
+		Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
 		drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
 		NavigationView navigation =
 				(NavigationView) findViewById(R.id.navigation);
@@ -318,7 +315,7 @@ public class NavDrawerActivity extends BriarFragmentActivity implements
 	}
 
 	private void setTransport(final TransportId id, final boolean enabled) {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				if (transports == null || transportsAdapter == null) return;

briar-android/src/org/briarproject/android/blogs/BaseController.java

@@ -3,6 +3,7 @@ package org.briarproject.android.blogs;
 import android.support.annotation.Nullable;
 import android.support.annotation.UiThread;
 
+import org.briarproject.android.DestroyableContext;
 import org.briarproject.android.controller.handler.ResultExceptionHandler;
 import org.briarproject.api.blogs.BlogPostHeader;
 import org.briarproject.api.db.DbException;
@@ -33,9 +34,13 @@ interface BaseController {
 
 	void setOnBlogPostAddedListener(OnBlogPostAddedListener listener);
 
-	interface OnBlogPostAddedListener {
+	interface OnBlogPostAddedListener extends DestroyableContext {
+
 		@UiThread
 		void onBlogPostAdded(BlogPostHeader header, boolean local);
+
+		@UiThread
+		void onBlogRemoved();
 	}
 
 }

briar-android/src/org/briarproject/android/blogs/BaseControllerImpl.java

@@ -1,6 +1,5 @@
 package org.briarproject.android.blogs;
 
-import android.app.Activity;
 import android.support.annotation.CallSuper;
 import android.support.annotation.Nullable;
 
@@ -39,16 +38,14 @@ abstract class BaseControllerImpl extends DbControllerImpl
 			Logger.getLogger(BaseControllerImpl.class.getName());
 
 	@Inject
-	protected Activity activity;
+	EventBus eventBus;
 	@Inject
-	protected EventBus eventBus;
+	AndroidNotificationManager notificationManager;
 	@Inject
-	protected AndroidNotificationManager notificationManager;
-	@Inject
-	protected IdentityManager identityManager;
+	IdentityManager identityManager;
 
 	@Inject
-	protected volatile BlogManager blogManager;
+	volatile BlogManager blogManager;
 
 	private final Map<MessageId, String> bodyCache = new ConcurrentHashMap<>();
 	private final Map<MessageId, BlogPostHeader> headerCache =
@@ -75,12 +72,12 @@ abstract class BaseControllerImpl extends DbControllerImpl
 	@CallSuper
 	public void eventOccurred(Event e) {
 		if (e instanceof BlogPostAddedEvent) {
-			final BlogPostAddedEvent m = (BlogPostAddedEvent) e;
+			final BlogPostAddedEvent b = (BlogPostAddedEvent) e;
 			LOG.info("New blog post added");
-			activity.runOnUiThread(new Runnable() {
+			listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 				@Override
 				public void run() {
-					listener.onBlogPostAdded(m.getHeader(), m.isLocal());
+					listener.onBlogPostAdded(b.getHeader(), b.isLocal());
 				}
 			});
 		}
@@ -110,8 +107,7 @@ abstract class BaseControllerImpl extends DbControllerImpl
 		});
 	}
 
-	protected Collection<BlogPostItem> loadItems(GroupId groupId)
-			throws DbException {
+	Collection<BlogPostItem> loadItems(GroupId groupId) throws DbException {
 		long now = System.currentTimeMillis();
 		Collection<BlogPostHeader> headers =
 				blogManager.getPostHeaders(groupId);

briar-android/src/org/briarproject/android/blogs/BasePostFragment.java

@@ -22,7 +22,7 @@ import static org.briarproject.android.util.AndroidUtils.MIN_RESOLUTION;
 
 abstract class BasePostFragment extends BaseFragment {
 
-	private final Logger LOG =
+	private static final Logger LOG =
 			Logger.getLogger(BasePostFragment.class.getName());
 
 	private View view;

briar-android/src/org/briarproject/android/blogs/BasePostPagerFragment.java

@@ -90,6 +90,7 @@ abstract class BasePostPagerFragment extends BaseFragment
 
 	abstract void loadBlogPost(BlogPostHeader header);
 
+	@UiThread
 	protected void onBlogPostsLoaded(MessageId select,
 			Collection<BlogPostItem> posts) {
 
@@ -98,6 +99,7 @@ abstract class BasePostPagerFragment extends BaseFragment
 		selectPost(select);
 	}
 
+	@UiThread
 	protected void onBlogPostsLoadedException(DbException exception) {
 		// TODO: Decide how to handle errors in the UI
 		finish();
@@ -174,4 +176,8 @@ abstract class BasePostPagerFragment extends BaseFragment
 		}
 	}
 
+	@Override
+	public void onBlogRemoved() {
+		finish();
+	}
 }

briar-android/src/org/briarproject/android/blogs/BlogControllerImpl.java

@@ -1,5 +1,7 @@
 package org.briarproject.android.blogs;
 
+import android.app.Activity;
+
 import org.briarproject.android.controller.ActivityLifecycleController;
 import org.briarproject.android.controller.handler.ResultExceptionHandler;
 import org.briarproject.api.blogs.Blog;
@@ -32,7 +34,7 @@ public class BlogControllerImpl extends BaseControllerImpl
 	}
 
 	@Override
-	public void onActivityCreate() {
+	public void onActivityCreate(Activity activity) {
 	}
 
 	@Override
@@ -69,11 +71,10 @@ public class BlogControllerImpl extends BaseControllerImpl
 			GroupRemovedEvent s = (GroupRemovedEvent) e;
 			if (s.getGroup().getId().equals(groupId)) {
 				LOG.info("Blog removed");
-				activity.runOnUiThread(new Runnable() {
+				listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 					@Override
 					public void run() {
-						// TODO: Not the controller's job, add a listener method
-						activity.finish();
+						listener.onBlogRemoved();
 					}
 				});
 			}

briar-android/src/org/briarproject/android/blogs/BlogFragment.java

@@ -160,8 +160,8 @@ public class BlogFragment extends BaseFragment implements
 				getActivity().onBackPressed();
 				return true;
 			case R.id.action_write_blog_post:
-				Intent i =
-						new Intent(getActivity(), WriteBlogPostActivity.class);
+				Intent i = new Intent(getActivity(),
+						WriteBlogPostActivity.class);
 				i.putExtra(GROUP_ID, groupId.getBytes());
 				i.putExtra(BLOG_NAME, blogName);
 				startActivityForResult(i, REQUEST_WRITE_POST,
@@ -224,7 +224,7 @@ public class BlogFragment extends BaseFragment implements
 					@Override
 					public void onExceptionUi(DbException exception) {
 						// TODO: Decide how to handle errors in the UI
-						getActivity().finish();
+						finish();
 					}
 				}
 		);
@@ -338,7 +338,7 @@ public class BlogFragment extends BaseFragment implements
 						Toast.makeText(getActivity(),
 								R.string.blogs_blog_removed, LENGTH_SHORT)
 								.show();
-						getActivity().supportFinishAfterTransition();
+						finish();
 					}
 
 					@Override
@@ -349,4 +349,8 @@ public class BlogFragment extends BaseFragment implements
 				});
 	}
 
+	@Override
+	public void onBlogRemoved() {
+		finish();
+	}
 }

briar-android/src/org/briarproject/android/blogs/BlogPostPagerFragment.java

@@ -41,6 +41,7 @@ public class BlogPostPagerFragment extends BasePostPagerFragment {
 	}
 
 
+	@Override
 	void loadBlogPosts(final MessageId select) {
 		blogController.loadBlogPosts(
 				new UiResultExceptionHandler<Collection<BlogPostItem>, DbException>(
@@ -57,6 +58,7 @@ public class BlogPostPagerFragment extends BasePostPagerFragment {
 				});
 	}
 
+	@Override
 	void loadBlogPost(BlogPostHeader header) {
 		blogController.loadBlogPost(header,
 				new UiResultExceptionHandler<BlogPostItem, DbException>(
@@ -73,5 +75,4 @@ public class BlogPostPagerFragment extends BasePostPagerFragment {
 					}
 				});
 	}
-
 }

briar-android/src/org/briarproject/android/blogs/FeedFragment.java

@@ -231,4 +231,9 @@ public class FeedFragment extends BaseFragment implements
 		}
 		s.show();
 	}
+
+	@Override
+	public void onBlogRemoved() {
+		finish();
+	}
 }

briar-android/src/org/briarproject/android/blogs/FeedPostPagerFragment.java

@@ -74,5 +74,4 @@ public class FeedPostPagerFragment extends BasePostPagerFragment {
 					}
 				});
 	}
-
 }

briar-android/src/org/briarproject/android/blogs/ReblogFragment.java

@@ -65,12 +65,7 @@ public class ReblogFragment extends BaseFragment implements TextInputListener {
 	@Override
 	public void onAttach(Context context) {
 		super.onAttach(context);
-		try {
-			listener = (BaseFragmentListener) context;
-		} catch (ClassCastException e) {
-			throw new ClassCastException(
-					"Using class must implement BaseFragmentListener");
-		}
+		listener = (BaseFragmentListener) context;
 	}
 
 	@Override
@@ -93,12 +88,6 @@ public class ReblogFragment extends BaseFragment implements TextInputListener {
 		return v;
 	}
 
-	@Override
-	public void onActivityCreated(@Nullable Bundle savedInstanceState) {
-		super.onActivityCreated(savedInstanceState);
-		listener.getActivityComponent().inject(this);
-	}
-
 	@Override
 	public void onStart() {
 		super.onStart();

briar-android/src/org/briarproject/android/blogs/RssFeedImportActivity.java

@@ -42,10 +42,11 @@ public class RssFeedImportActivity extends BriarActivity {
 
 	@Inject
 	@IoExecutor
-	protected Executor ioExecutor;
+	Executor ioExecutor;
 
 	// Fields that are accessed from background threads must be volatile
 	private volatile GroupId groupId = null;
+
 	@Inject
 	@SuppressWarnings("WeakerAccess")
 	volatile FeedManager feedManager;
@@ -139,7 +140,7 @@ public class RssFeedImportActivity extends BriarActivity {
 	}
 
 	private void feedImported() {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				supportFinishAfterTransition();
@@ -148,11 +149,9 @@ public class RssFeedImportActivity extends BriarActivity {
 	}
 
 	private void importFailed() {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
-				if (RssFeedImportActivity.this.hasBeenDestroyed()) return;
-
 				// hide progress bar, show publish button
 				progressBar.setVisibility(GONE);
 				importButton.setVisibility(VISIBLE);

briar-android/src/org/briarproject/android/blogs/RssFeedManageActivity.java

@@ -40,6 +40,7 @@ public class RssFeedManageActivity extends BriarActivity
 
 	// Fields that are accessed from background threads must be volatile
 	private volatile GroupId groupId = null;
+
 	@Inject
 	@SuppressWarnings("WeakerAccess")
 	volatile FeedManager feedManager;
@@ -135,7 +136,7 @@ public class RssFeedManageActivity extends BriarActivity
 	}
 
 	private void addFeeds(final List<Feed> feeds) {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				if (feeds.size() == 0) list.showData();
@@ -145,7 +146,7 @@ public class RssFeedManageActivity extends BriarActivity
 	}
 
 	private void onFeedDeleted(final Feed feed) {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				adapter.remove(feed);
@@ -154,7 +155,7 @@ public class RssFeedManageActivity extends BriarActivity
 	}
 
 	private void onDeleteError() {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				Snackbar.make(list,

briar-android/src/org/briarproject/android/blogs/WriteBlogPostActivity.java

@@ -44,7 +44,7 @@ public class WriteBlogPostActivity extends BriarActivity
 			Logger.getLogger(WriteBlogPostActivity.class.getName());
 
 	@Inject
-	protected AndroidNotificationManager notificationManager;
+	AndroidNotificationManager notificationManager;
 
 	private TextInputView input;
 	private ProgressBar progressBar;
@@ -52,7 +52,7 @@ public class WriteBlogPostActivity extends BriarActivity
 	// Fields that are accessed from background threads must be volatile
 	private volatile GroupId groupId;
 	@Inject
-	protected volatile IdentityManager identityManager;
+	volatile IdentityManager identityManager;
 	@Inject
 	volatile BlogPostFactory blogPostFactory;
 	@Inject
@@ -168,7 +168,7 @@ public class WriteBlogPostActivity extends BriarActivity
 	}
 
 	private void postPublished() {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				setResult(RESULT_OK);
@@ -178,7 +178,7 @@ public class WriteBlogPostActivity extends BriarActivity
 	}
 
 	private void postFailedToPublish() {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				// hide progress bar, show publish button

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

@@ -63,33 +63,29 @@ import static org.briarproject.android.BriarActivity.GROUP_ID;
 
 public class ContactListFragment extends BaseFragment implements EventListener {
 
-	public final static String TAG = "ContactListFragment";
-
-	private static final Logger LOG =
-			Logger.getLogger(ContactListFragment.class.getName());
+	public static final String TAG = ContactListFragment.class.getName();
+	private static final Logger LOG = Logger.getLogger(TAG);
 
 	@Inject
 	ConnectionRegistry connectionRegistry;
 	@Inject
-	protected EventBus eventBus;
+	EventBus eventBus;
 	@Inject
-	protected AndroidNotificationManager notificationManager;
+	AndroidNotificationManager notificationManager;
 
-	private ContactListAdapter adapter = null;
-	private BriarRecyclerView list = null;
+	private ContactListAdapter adapter;
+	private BriarRecyclerView list;
 
 	// Fields that are accessed from background threads must be volatile
 	@Inject
-	protected volatile ContactManager contactManager;
+	volatile ContactManager contactManager;
 	@Inject
-	protected volatile IdentityManager identityManager;
+	volatile IdentityManager identityManager;
 	@Inject
-	protected volatile ConversationManager conversationManager;
+	volatile ConversationManager conversationManager;
 
 	public static ContactListFragment newInstance() {
-
 		Bundle args = new Bundle();
-
 		ContactListFragment fragment = new ContactListFragment();
 		fragment.setArguments(args);
 		return fragment;
@@ -230,7 +226,7 @@ public class ContactListFragment extends BaseFragment implements EventListener {
 	}
 
 	private void displayContacts(final List<ContactListItem> contacts) {
-		listener.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				if (contacts.size() == 0) list.showData();
@@ -284,7 +280,7 @@ public class ContactListFragment extends BaseFragment implements EventListener {
 	}
 
 	private void updateItem(final ContactId c, final ConversationItem m) {
-		listener.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				int position = adapter.findItemPosition(c);
@@ -298,7 +294,7 @@ public class ContactListFragment extends BaseFragment implements EventListener {
 	}
 
 	private void updateItem(final GroupId g, final ConversationItem m) {
-		listener.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				int position = adapter.findItemPosition(g);
@@ -312,7 +308,7 @@ public class ContactListFragment extends BaseFragment implements EventListener {
 	}
 
 	private void removeItem(final ContactId c) {
-		listener.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				int position = adapter.findItemPosition(c);
@@ -323,7 +319,7 @@ public class ContactListFragment extends BaseFragment implements EventListener {
 	}
 
 	private void setConnected(final ContactId c, final boolean connected) {
-		listener.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				int position = adapter.findItemPosition(c);

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

@@ -130,21 +130,21 @@ public class ConversationActivity extends BriarActivity
 
 	// Fields that are accessed from background threads must be volatile
 	@Inject
-	protected volatile ContactManager contactManager;
+	volatile ContactManager contactManager;
 	@Inject
-	protected volatile MessagingManager messagingManager;
+	volatile MessagingManager messagingManager;
 	@Inject
-	protected volatile EventBus eventBus;
+	volatile EventBus eventBus;
 	@Inject
-	protected volatile SettingsManager settingsManager;
+	volatile SettingsManager settingsManager;
 	@Inject
 	volatile PrivateMessageFactory privateMessageFactory;
 	@Inject
-	protected volatile IntroductionManager introductionManager;
+	volatile IntroductionManager introductionManager;
 	@Inject
-	protected volatile ForumSharingManager forumSharingManager;
+	volatile ForumSharingManager forumSharingManager;
 	@Inject
-	protected volatile BlogSharingManager blogSharingManager;
+	volatile BlogSharingManager blogSharingManager;
 
 	private volatile GroupId groupId = null;
 	private volatile ContactId contactId = null;
@@ -309,7 +309,7 @@ public class ConversationActivity extends BriarActivity
 	}
 
 	private void displayContactDetails() {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				toolbarAvatar.setImageDrawable(
@@ -374,7 +374,7 @@ public class ConversationActivity extends BriarActivity
 	private void displayMessages(final Collection<PrivateMessageHeader> headers,
 			final Collection<IntroductionMessage> introductions,
 			final Collection<InvitationMessage> invitations) {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				textInputView.setSendButtonEnabled(true);
@@ -446,7 +446,7 @@ public class ConversationActivity extends BriarActivity
 	}
 
 	private void displayMessageBody(final MessageId m, final byte[] body) {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				bodyCache.put(m, body);
@@ -466,7 +466,7 @@ public class ConversationActivity extends BriarActivity
 	}
 
 	private void addConversationItem(final ConversationItem item) {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				adapter.add(item);
@@ -599,7 +599,7 @@ public class ConversationActivity extends BriarActivity
 	}
 
 	private void markMessageReadIfNew(final BaseMessageHeader h) {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				ConversationItem item = adapter.getLastItem();
@@ -635,7 +635,7 @@ public class ConversationActivity extends BriarActivity
 
 	private void markMessages(final Collection<MessageId> messageIds,
 			final boolean sent, final boolean seen) {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				Set<MessageId> messages = new HashSet<>(messageIds);
@@ -747,7 +747,7 @@ public class ConversationActivity extends BriarActivity
 	}
 
 	private void finishAfterContactRemoved() {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				String deleted = getString(R.string.contact_deleted_toast);
@@ -781,7 +781,7 @@ public class ConversationActivity extends BriarActivity
 	}
 
 	private void enableIntroductionAction(final MenuItem item) {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				item.setEnabled(true);
@@ -790,7 +790,7 @@ public class ConversationActivity extends BriarActivity
 	}
 
 	private void showIntroductionOnboarding() {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				// find view of overflow icon
@@ -877,7 +877,7 @@ public class ConversationActivity extends BriarActivity
 	}
 
 	private void introductionResponseError() {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				Toast.makeText(ConversationActivity.this,

briar-android/src/org/briarproject/android/controller/ActivityLifecycleController.java

@@ -1,7 +1,10 @@
 package org.briarproject.android.controller;
 
+import android.app.Activity;
+
 public interface ActivityLifecycleController {
-	void onActivityCreate();
+
+	void onActivityCreate(Activity activity);
 
 	void onActivityResume();
 

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

@@ -20,11 +20,11 @@ public class BriarControllerImpl implements BriarController {
 			Logger.getLogger(BriarControllerImpl.class.getName());
 
 	@Inject
-	protected BriarServiceConnection serviceConnection;
+	BriarServiceConnection serviceConnection;
 	@Inject
-	protected DatabaseConfig databaseConfig;
+	DatabaseConfig databaseConfig;
 	@Inject
-	protected Activity activity;
+	Activity activity;
 
 	private boolean bound = false;
 
@@ -35,7 +35,7 @@ public class BriarControllerImpl implements BriarController {
 
 	@Override
 	@CallSuper
-	public void onActivityCreate() {
+	public void onActivityCreate(Activity activity) {
 		if (databaseConfig.getEncryptionKey() != null) startAndBindService();
 	}
 
@@ -90,7 +90,7 @@ public class BriarControllerImpl implements BriarController {
 		}.start();
 	}
 
-	protected void unbindService() {
+	private void unbindService() {
 		if (bound) activity.unbindService(serviceConnection);
 	}
 

briar-android/src/org/briarproject/android/controller/NavDrawerController.java

@@ -6,8 +6,6 @@ import org.briarproject.api.identity.LocalAuthor;
 
 public interface NavDrawerController extends ActivityLifecycleController {
 
-	void setTransportListener(TransportStateListener transportListener);
-
 	boolean isTransportRunning(TransportId transportId);
 
 	void storeLocalAuthor(LocalAuthor author,

briar-android/src/org/briarproject/android/controller/NavDrawerControllerImpl.java

@@ -30,19 +30,17 @@ public class NavDrawerControllerImpl extends DbControllerImpl
 			Logger.getLogger(NavDrawerControllerImpl.class.getName());
 
 	@Inject
-	protected ReferenceManager referenceManager;
+	ReferenceManager referenceManager;
 	@Inject
-	protected PluginManager pluginManager;
+	PluginManager pluginManager;
 	@Inject
-	protected EventBus eventBus;
-	@Inject
-	protected Activity activity;
+	EventBus eventBus;
 
 	// Fields that are accessed from background threads must be volatile
 	@Inject
 	protected volatile IdentityManager identityManager;
 
-	private TransportStateListener transportStateListener;
+	private TransportStateListener listener;
 
 	@Inject
 	public NavDrawerControllerImpl() {
@@ -50,8 +48,8 @@ public class NavDrawerControllerImpl extends DbControllerImpl
 	}
 
 	@Override
-	public void onActivityCreate() {
-
+	public void onActivityCreate(Activity activity) {
+		listener = (TransportStateListener) activity;
 	}
 
 	@Override
@@ -88,21 +86,14 @@ public class NavDrawerControllerImpl extends DbControllerImpl
 
 	private void transportStateUpdate(final TransportId id,
 			final boolean enabled) {
-		activity.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
-				if (transportStateListener != null) {
-					transportStateListener.stateUpdate(id, enabled);
-				}
+				listener.stateUpdate(id, enabled);
 			}
 		});
 	}
 
-	@Override
-	public void setTransportListener(TransportStateListener transportListener) {
-		this.transportStateListener = transportListener;
-	}
-
 	@Override
 	public boolean isTransportRunning(TransportId transportId) {
 		Plugin plugin = pluginManager.getPlugin(transportId);

briar-android/src/org/briarproject/android/controller/TransportStateListener.java

@@ -1,8 +1,9 @@
 package org.briarproject.android.controller;
 
+import org.briarproject.android.DestroyableContext;
 import org.briarproject.api.TransportId;
 
-public interface TransportStateListener {
+public interface TransportStateListener extends DestroyableContext {
 
 	void stateUpdate(TransportId id, boolean enabled);
 }

briar-android/src/org/briarproject/android/controller/handler/UiResultExceptionHandler.java

@@ -2,35 +2,33 @@ package org.briarproject.android.controller.handler;
 
 import android.support.annotation.UiThread;
 
-import org.briarproject.android.DestroyableActivity;
+import org.briarproject.android.DestroyableContext;
 
 public abstract class UiResultExceptionHandler<R, E extends Exception>
 		implements ResultExceptionHandler<R, E> {
 
-	private final DestroyableActivity listener;
+	private final DestroyableContext listener;
 
-	protected UiResultExceptionHandler(DestroyableActivity listener) {
+	protected UiResultExceptionHandler(DestroyableContext listener) {
 		this.listener = listener;
 	}
 
 	@Override
 	public void onResult(final R result) {
-		listener.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
-				if (!listener.hasBeenDestroyed())
-					onResultUi(result);
+				onResultUi(result);
 			}
 		});
 	}
 
 	@Override
 	public void onException(final E exception) {
-		listener.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
-				if (!listener.hasBeenDestroyed())
-					onExceptionUi(exception);
+				onExceptionUi(exception);
 			}
 		});
 	}

briar-android/src/org/briarproject/android/controller/handler/UiResultHandler.java

@@ -2,24 +2,22 @@ package org.briarproject.android.controller.handler;
 
 import android.support.annotation.UiThread;
 
-import org.briarproject.android.DestroyableActivity;
-import org.briarproject.android.fragment.BaseFragment.BaseFragmentListener;
+import org.briarproject.android.DestroyableContext;
 
 public abstract class UiResultHandler<R> implements ResultHandler<R> {
 
-	private final DestroyableActivity listener;
+	private final DestroyableContext listener;
 
-	protected UiResultHandler(DestroyableActivity listener) {
+	protected UiResultHandler(DestroyableContext listener) {
 		this.listener = listener;
 	}
 
 	@Override
 	public void onResult(final R result) {
-		listener.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
-				if (!listener.hasBeenDestroyed())
-					onResultUi(result);
+				onResultUi(result);
 			}
 		});
 	}

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

@@ -144,7 +144,7 @@ public class CreateForumActivity extends BriarActivity
 	}
 
 	private void displayForum(final Forum f) {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				Intent i = new Intent(CreateForumActivity.this,

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

@@ -267,9 +267,8 @@ public class ForumActivity extends BriarActivity implements
 			// root post
 			forumController.createPost(StringUtils.toUtf8(text), resultHandler);
 		} else {
-			forumController
-					.createPost(StringUtils.toUtf8(text), replyEntry.getId(),
-							resultHandler);
+			forumController.createPost(StringUtils.toUtf8(text),
+					replyEntry.getId(), resultHandler);
 		}
 		textInput.hideSoftKeyboard();
 		textInput.setVisibility(GONE);
@@ -344,7 +343,7 @@ public class ForumActivity extends BriarActivity implements
 	}
 
 	@Override
-	public void onExternalEntryAdded(ForumPostHeader header) {
+	public void onForumPostReceived(ForumPostHeader header) {
 		forumController.loadPost(header,
 				new UiResultExceptionHandler<ForumEntry, DbException>(this) {
 					@Override
@@ -357,6 +356,10 @@ public class ForumActivity extends BriarActivity implements
 						// TODO add proper exception handling
 					}
 				});
+	}
 
+	@Override
+	public void onForumRemoved() {
+		finish();
 	}
 }

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

@@ -3,6 +3,7 @@ package org.briarproject.android.forum;
 import android.support.annotation.Nullable;
 import android.support.annotation.UiThread;
 
+import org.briarproject.android.DestroyableContext;
 import org.briarproject.android.controller.ActivityLifecycleController;
 import org.briarproject.android.controller.handler.ResultExceptionHandler;
 import org.briarproject.android.controller.handler.ResultHandler;
@@ -38,9 +39,13 @@ public interface ForumController extends ActivityLifecycleController {
 	void createPost(byte[] body, MessageId parentId,
 			ResultExceptionHandler<ForumEntry, DbException> resultHandler);
 
-	interface ForumPostListener {
+	interface ForumPostListener extends DestroyableContext {
+
 		@UiThread
-		void onExternalEntryAdded(ForumPostHeader header);
+		void onForumPostReceived(ForumPostHeader header);
+
+		@UiThread
+		void onForumRemoved();
 	}
 
 }

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

@@ -51,21 +51,19 @@ public class ForumControllerImpl extends DbControllerImpl
 	private static final Logger LOG =
 			Logger.getLogger(ForumControllerImpl.class.getName());
 
-	@Inject
-	protected Activity activity;
 	@Inject
 	@CryptoExecutor
-	protected Executor cryptoExecutor;
+	Executor cryptoExecutor;
 	@Inject
 	volatile ForumPostFactory forumPostFactory;
 	@Inject
-	protected volatile CryptoComponent crypto;
+	volatile CryptoComponent crypto;
 	@Inject
-	protected volatile ForumManager forumManager;
+	volatile ForumManager forumManager;
 	@Inject
-	protected volatile EventBus eventBus;
+	volatile EventBus eventBus;
 	@Inject
-	protected volatile IdentityManager identityManager;
+	volatile IdentityManager identityManager;
 
 	private final Map<MessageId, byte[]> bodyCache = new ConcurrentHashMap<>();
 	private final AtomicLong newestTimeStamp = new AtomicLong();
@@ -81,7 +79,7 @@ public class ForumControllerImpl extends DbControllerImpl
 	}
 
 	@Override
-	public void onActivityCreate() {
+	public void onActivityCreate(Activity activity) {
 		if (activity instanceof ForumPostListener) {
 			listener = (ForumPostListener) activity;
 		} else {
@@ -114,10 +112,10 @@ public class ForumControllerImpl extends DbControllerImpl
 				LOG.info("Forum post received, adding...");
 				final ForumPostHeader fph = pe.getForumPostHeader();
 				updateNewestTimestamp(fph.getTimestamp());
-				activity.runOnUiThread(new Runnable() {
+				listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 					@Override
 					public void run() {
-						listener.onExternalEntryAdded(fph);
+						listener.onForumPostReceived(fph);
 					}
 				});
 			}
@@ -125,10 +123,10 @@ public class ForumControllerImpl extends DbControllerImpl
 			GroupRemovedEvent s = (GroupRemovedEvent) e;
 			if (s.getGroup().getId().equals(forum.getId())) {
 				LOG.info("Forum removed");
-				activity.runOnUiThread(new Runnable() {
+				listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 					@Override
 					public void run() {
-						activity.finish();
+						listener.onForumRemoved();
 					}
 				});
 			}

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

@@ -56,13 +56,13 @@ public class ForumListFragment extends BaseEventFragment implements
 	private Snackbar snackbar;
 
 	@Inject
-	protected AndroidNotificationManager notificationManager;
+	AndroidNotificationManager notificationManager;
 
 	// Fields that are accessed from background threads must be volatile
 	@Inject
-	protected volatile ForumManager forumManager;
+	volatile ForumManager forumManager;
 	@Inject
-	protected volatile ForumSharingManager forumSharingManager;
+	volatile ForumSharingManager forumSharingManager;
 
 	public static ForumListFragment newInstance() {
 
@@ -181,7 +181,7 @@ public class ForumListFragment extends BaseEventFragment implements
 	}
 
 	private void displayForums(final Collection<ForumListItem> forums) {
-		listener.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				if (forums.size() > 0) adapter.addAll(forums);
@@ -211,10 +211,9 @@ public class ForumListFragment extends BaseEventFragment implements
 	}
 
 	private void displayAvailableForums(final int availableCount) {
-		listener.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
-				if (getActivity() == null) return;
 				if (availableCount == 0) {
 					snackbar.dismiss();
 				} else {
@@ -245,16 +244,16 @@ public class ForumListFragment extends BaseEventFragment implements
 				removeForum(g.getGroup().getId());
 			}
 		} else if (e instanceof ForumPostReceivedEvent) {
-			ForumPostReceivedEvent m = (ForumPostReceivedEvent) e;
+			ForumPostReceivedEvent f = (ForumPostReceivedEvent) e;
 			LOG.info("Forum post added, updating...");
-			updateItem(m.getGroupId(), m.getForumPostHeader());
+			updateItem(f.getGroupId(), f.getForumPostHeader());
 		} else if (e instanceof ForumInvitationReceivedEvent) {
 			loadAvailableForums();
 		}
 	}
 
 	private void updateItem(final GroupId g, final ForumPostHeader m) {
-		listener.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				int position = adapter.findItemPosition(g);
@@ -268,7 +267,7 @@ public class ForumListFragment extends BaseEventFragment implements
 	}
 
 	private void removeForum(final GroupId g) {
-		listener.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				int position = adapter.findItemPosition(g);

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

@@ -7,9 +7,10 @@ import android.support.annotation.UiThread;
 import android.support.v4.app.Fragment;
 
 import org.briarproject.android.ActivityComponent;
-import org.briarproject.android.DestroyableActivity;
+import org.briarproject.android.DestroyableContext;
 
-public abstract class BaseFragment extends Fragment {
+public abstract class BaseFragment extends Fragment
+		implements DestroyableContext {
 
 	protected BaseFragmentListener listener;
 
@@ -20,12 +21,7 @@ public abstract class BaseFragment extends Fragment {
 	@Override
 	public void onAttach(Context context) {
 		super.onAttach(context);
-		try {
-			listener = (BaseFragmentListener) context;
-		} catch (ClassCastException e) {
-			throw new ClassCastException(
-					"Using class must implement BaseFragmentListener");
-		}
+		listener = (BaseFragmentListener) context;
 	}
 
 	@Override
@@ -37,7 +33,7 @@ public abstract class BaseFragment extends Fragment {
 	@Override
 	public void onActivityCreated(@Nullable Bundle savedInstanceState) {
 		super.onActivityCreated(savedInstanceState);
-		this.injectFragment(listener.getActivityComponent());
+		injectFragment(listener.getActivityComponent());
 		listener.onFragmentCreated(getUniqueTag());
 	}
 
@@ -46,7 +42,7 @@ public abstract class BaseFragment extends Fragment {
 		getActivity().supportFinishAfterTransition();
 	}
 
-	public interface BaseFragmentListener extends DestroyableActivity {
+	public interface BaseFragmentListener extends DestroyableContext {
 
 		void runOnDbThread(Runnable runnable);
 
@@ -56,4 +52,9 @@ public abstract class BaseFragment extends Fragment {
 		@UiThread
 		void onFragmentCreated(String tag);
 	}
+
+	@Override
+	public void runOnUiThreadUnlessDestroyed(Runnable r) {
+		listener.runOnUiThreadUnlessDestroyed(r);
+	}
 }

briar-android/src/org/briarproject/android/fragment/SettingsFragment.java

@@ -75,15 +75,10 @@ public class SettingsFragment extends PreferenceFragmentCompat
 	public void onAttach(Context context) {
 		super.onAttach(context);
 
-		try {
-			listener = (SettingsActivity) context;
-			androidExecutor = listener.getAndroidExecutor();
-			settingsManager = listener.getSettingsManager();
-			eventBus = listener.getEventBus();
-		} catch (ClassCastException e) {
-			throw new ClassCastException(context.toString()
-					+ " is not a SettingsActivity");
-		}
+		listener = (SettingsActivity) context;
+		androidExecutor = listener.getAndroidExecutor();
+		settingsManager = listener.getSettingsManager();
+		eventBus = listener.getEventBus();
 	}
 
 	@Override
@@ -195,7 +190,7 @@ public class SettingsFragment extends PreferenceFragmentCompat
 	}
 
 	private void displaySettings() {
-		listener.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				enableBluetooth.setValue(Boolean.toString(bluetoothSetting));

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

@@ -39,10 +39,8 @@ import static java.util.logging.Level.WARNING;
 
 public class ContactChooserFragment extends BaseFragment {
 
-	public final static String TAG = "ContactChooserFragment";
-
-	private static final Logger LOG =
-			Logger.getLogger(ContactChooserFragment.class.getName());
+	public static final String TAG = ContactChooserFragment.class.getName();
+	private static final Logger LOG = Logger.getLogger(TAG);
 
 	private IntroductionActivity introductionActivity;
 	private BriarRecyclerView list;
@@ -72,12 +70,7 @@ public class ContactChooserFragment extends BaseFragment {
 	@Override
 	public void onAttach(Context context) {
 		super.onAttach(context);
-		try {
-			introductionActivity = (IntroductionActivity) context;
-		} catch (ClassCastException e) {
-			throw new InstantiationError(
-					"This fragment is only meant to be attached to the IntroductionActivity");
-		}
+		introductionActivity = (IntroductionActivity) context;
 	}
 
 	@Override
@@ -182,7 +175,7 @@ public class ContactChooserFragment extends BaseFragment {
 
 	private void displayContacts(final AuthorId localAuthorId,
 			final List<ContactListItem> contacts) {
-		introductionActivity.runOnUiThread(new Runnable() {
+		introductionActivity.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				adapter.setLocalAuthor(localAuthorId);

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

@@ -37,12 +37,12 @@ import static java.util.logging.Level.WARNING;
 public class IntroductionMessageFragment extends BaseFragment
 		implements TextInputView.TextInputListener {
 
-	public final static String TAG = "IntroductionMessageFragment";
+	public static final String TAG =
+			IntroductionMessageFragment.class.getName();
+	private static final Logger LOG = Logger.getLogger(TAG);
 
 	private final static String CONTACT_ID_1 = "contact1";
 	private final static String CONTACT_ID_2 = "contact2";
-	private static final Logger LOG =
-			Logger.getLogger(IntroductionMessageFragment.class.getName());
 
 	private IntroductionActivity introductionActivity;
 	private ViewHolder ui;
@@ -72,12 +72,7 @@ public class IntroductionMessageFragment extends BaseFragment
 	@Override
 	public void onAttach(Context context) {
 		super.onAttach(context);
-		try {
-			introductionActivity = (IntroductionActivity) context;
-		} catch (ClassCastException e) {
-			throw new java.lang.InstantiationError(
-					"This fragment is only meant to be attached to the IntroductionActivity");
-		}
+		introductionActivity = (IntroductionActivity) context;
 	}
 
 	@Override
@@ -142,7 +137,7 @@ public class IntroductionMessageFragment extends BaseFragment
 	}
 
 	private void setUpViews(final Contact c1, final Contact c2) {
-		introductionActivity.runOnUiThread(new Runnable() {
+		introductionActivity.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				contact1 = c1;
@@ -209,7 +204,7 @@ public class IntroductionMessageFragment extends BaseFragment
 	}
 
 	private void introductionError() {
-		introductionActivity.runOnUiThread(new Runnable() {
+		introductionActivity.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				Toast.makeText(introductionActivity,

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

@@ -205,6 +205,7 @@ public class AddContactActivity extends BriarActivity
 
 	void loadLocalAuthor() {
 		runOnDbThread(new Runnable() {
+			@Override
 			public void run() {
 				try {
 					long now = System.currentTimeMillis();
@@ -222,7 +223,7 @@ public class AddContactActivity extends BriarActivity
 	}
 
 	void setLocalAuthorId(final AuthorId localAuthorId) {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				AddContactActivity.this.localAuthorId = localAuthorId;
@@ -283,8 +284,10 @@ public class AddContactActivity extends BriarActivity
 		}
 	}
 
+	@Override
 	public void connectionSucceeded() {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
+			@Override
 			public void run() {
 				connected = true;
 				setView(new ConfirmationCodeView(AddContactActivity.this,
@@ -293,8 +296,10 @@ public class AddContactActivity extends BriarActivity
 		});
 	}
 
+	@Override
 	public void connectionFailed() {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
+			@Override
 			public void run() {
 				connectionFailed = true;
 				setView(new ErrorView(AddContactActivity.this,
@@ -304,9 +309,11 @@ public class AddContactActivity extends BriarActivity
 		});
 	}
 
+	@Override
 	public void keyAgreementSucceeded(final int localCode,
 			final int remoteCode) {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
+			@Override
 			public void run() {
 				localConfirmationCode = localCode;
 				remoteConfirmationCode = remoteCode;
@@ -315,8 +322,10 @@ public class AddContactActivity extends BriarActivity
 		});
 	}
 
+	@Override
 	public void keyAgreementFailed() {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
+			@Override
 			public void run() {
 				connectionFailed = true;
 				setView(new ErrorView(AddContactActivity.this,
@@ -326,8 +335,10 @@ public class AddContactActivity extends BriarActivity
 		});
 	}
 
+	@Override
 	public void remoteConfirmationSucceeded() {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
+			@Override
 			public void run() {
 				remoteCompared = true;
 				remoteMatched = true;
@@ -339,8 +350,10 @@ public class AddContactActivity extends BriarActivity
 		});
 	}
 
+	@Override
 	public void remoteConfirmationFailed() {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
+			@Override
 			public void run() {
 				remoteCompared = true;
 				remoteMatched = false;
@@ -352,8 +365,10 @@ public class AddContactActivity extends BriarActivity
 		});
 	}
 
+	@Override
 	public void pseudonymExchangeSucceeded(final String remoteName) {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
+			@Override
 			public void run() {
 				contactName = remoteName;
 				showToastAndFinish();
@@ -361,8 +376,10 @@ public class AddContactActivity extends BriarActivity
 		});
 	}
 
+	@Override
 	public void pseudonymExchangeFailed() {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
+			@Override
 			public void run() {
 				setView(new ErrorView(AddContactActivity.this,
 						R.string.connection_failed,
@@ -386,34 +403,42 @@ public class AddContactActivity extends BriarActivity
 			this.handle = handle;
 		}
 
+		@Override
 		public void connectionSucceeded() {
 			// Wait for key agreement to succeed or fail
 		}
 
+		@Override
 		public void connectionFailed() {
 			referenceManager.removeReference(handle, InvitationTask.class);
 		}
 
+		@Override
 		public void keyAgreementSucceeded(int localCode, int remoteCode) {
 			// Wait for remote confirmation to succeed or fail
 		}
 
+		@Override
 		public void keyAgreementFailed() {
 			referenceManager.removeReference(handle, InvitationTask.class);
 		}
 
+		@Override
 		public void remoteConfirmationSucceeded() {
 			// Wait for the pseudonym exchange to succeed or fail
 		}
 
+		@Override
 		public void remoteConfirmationFailed() {
 			referenceManager.removeReference(handle, InvitationTask.class);
 		}
 
+		@Override
 		public void pseudonymExchangeSucceeded(String remoteName) {
 			referenceManager.removeReference(handle, InvitationTask.class);
 		}
 
+		@Override
 		public void pseudonymExchangeFailed() {
 			referenceManager.removeReference(handle, InvitationTask.class);
 		}

briar-android/src/org/briarproject/android/keyagreement/IntroFragment.java

@@ -43,12 +43,7 @@ public class IntroFragment extends BaseFragment {
 	@Override
 	public void onAttach(Context context) {
 		super.onAttach(context);
-		try {
-			screenSeenListener = (IntroScreenSeenListener) context;
-		} catch (ClassCastException e) {
-			throw new ClassCastException(
-					"Using class must implement IntroScreenSeenListener");
-		}
+		screenSeenListener = (IntroScreenSeenListener) context;
 	}
 
 	@Override

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

@@ -128,7 +128,7 @@ public class KeyAgreementActivity extends BriarFragmentActivity implements
 	}
 
 	private void keyAgreementFinished(final KeyAgreementResult result) {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				startContactExchange(result);
@@ -162,7 +162,7 @@ public class KeyAgreementActivity extends BriarFragmentActivity implements
 
 	@Override
 	public void contactExchangeSucceeded(final Author remoteAuthor) {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				String contactName = remoteAuthor.getName();
@@ -177,7 +177,7 @@ public class KeyAgreementActivity extends BriarFragmentActivity implements
 
 	@Override
 	public void duplicateContact(final Author remoteAuthor) {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				String contactName = remoteAuthor.getName();
@@ -192,7 +192,7 @@ public class KeyAgreementActivity extends BriarFragmentActivity implements
 
 	@Override
 	public void contactExchangeFailed() {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				Toast.makeText(KeyAgreementActivity.this,

briar-android/src/org/briarproject/android/keyagreement/ShowQrCodeFragment.java

@@ -18,7 +18,6 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.view.animation.AlphaAnimation;
 import android.widget.ImageView;
-import android.widget.ProgressBar;
 import android.widget.TextView;
 import android.widget.Toast;
 
@@ -67,23 +66,21 @@ public class ShowQrCodeFragment extends BaseEventFragment
 	private static final Logger LOG = Logger.getLogger(TAG);
 
 	@Inject
-	protected KeyAgreementTaskFactory keyAgreementTaskFactory;
+	KeyAgreementTaskFactory keyAgreementTaskFactory;
 	@Inject
-	protected PayloadEncoder payloadEncoder;
+	PayloadEncoder payloadEncoder;
 	@Inject
-	protected PayloadParser payloadParser;
+	PayloadParser payloadParser;
 	@Inject
-	protected AndroidExecutor androidExecutor;
+	AndroidExecutor androidExecutor;
 	@Inject
 	@IoExecutor
-	protected Executor ioExecutor;
+	Executor ioExecutor;
 
 	private CameraView cameraView;
-	private ViewGroup cameraOverlay;
 	private View statusView;
 	private TextView status;
 	private ImageView qrCode;
-	private ProgressBar mainProgressBar;
 	private TextView mainProgressTitle;
 	private ViewGroup mainProgressContainer;
 
@@ -124,11 +121,9 @@ public class ShowQrCodeFragment extends BaseEventFragment
 		super.onViewCreated(view, savedInstanceState);
 
 		cameraView = (CameraView) view.findViewById(R.id.camera_view);
-		cameraOverlay = (ViewGroup) view.findViewById(R.id.camera_overlay);
 		statusView = view.findViewById(R.id.status_container);
 		status = (TextView) view.findViewById(R.id.connect_status);
 		qrCode = (ImageView) view.findViewById(R.id.qr_code);
-		mainProgressBar = (ProgressBar) view.findViewById(R.id.progress_bar);
 		mainProgressTitle =
 				(TextView) view.findViewById(R.id.title_progress_bar);
 		mainProgressContainer =
@@ -286,11 +281,12 @@ public class ShowQrCodeFragment extends BaseEventFragment
 			KeyAgreementAbortedEvent event = (KeyAgreementAbortedEvent) e;
 			keyAgreementAborted(event.didRemoteAbort());
 		} else if (e instanceof KeyAgreementFinishedEvent) {
-			listener.runOnUiThread(new Runnable() {
+			listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 				@Override
 				public void run() {
 					mainProgressContainer.setVisibility(VISIBLE);
-					mainProgressTitle.setText(R.string.exchanging_contact_details);
+					mainProgressTitle.setText(
+							R.string.exchanging_contact_details);
 				}
 			});
 		}
@@ -309,9 +305,7 @@ public class ShowQrCodeFragment extends BaseEventFragment
 				String input =
 						Base64.encodeToString(payloadEncoder.encode(payload),
 								0);
-				Bitmap bitmap =
-						QrCodeUtils.createQrCode(dm, input);
-				return bitmap;
+				return QrCodeUtils.createQrCode(dm, input);
 			}
 
 			@Override
@@ -328,7 +322,7 @@ public class ShowQrCodeFragment extends BaseEventFragment
 	}
 
 	private void setQrCode(final Payload localPayload) {
-		listener.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				generateBitmapQR(localPayload);
@@ -337,7 +331,7 @@ public class ShowQrCodeFragment extends BaseEventFragment
 	}
 
 	private void keyAgreementFailed() {
-		listener.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				reset();
@@ -349,7 +343,7 @@ public class ShowQrCodeFragment extends BaseEventFragment
 	}
 
 	private void keyAgreementWaiting() {
-		listener.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				status.setText(R.string.waiting_for_contact);
@@ -358,7 +352,7 @@ public class ShowQrCodeFragment extends BaseEventFragment
 	}
 
 	private void keyAgreementStarted() {
-		listener.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				mainProgressContainer.setVisibility(VISIBLE);
@@ -368,7 +362,7 @@ public class ShowQrCodeFragment extends BaseEventFragment
 	}
 
 	private void keyAgreementAborted(final boolean remoteAborted) {
-		listener.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				reset();
@@ -385,7 +379,7 @@ public class ShowQrCodeFragment extends BaseEventFragment
 
 	@Override
 	public void handleResult(final Result result) {
-		listener.runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				LOG.info("Got result from decoder");

briar-android/src/org/briarproject/android/sharing/ContactSelectorFragment.java

@@ -46,10 +46,8 @@ import static org.briarproject.api.sharing.SharingConstants.GROUP_ID;
 public class ContactSelectorFragment extends BaseFragment implements
 		BaseContactListAdapter.OnItemClickListener {
 
-	public final static String TAG = "ContactSelectorFragment";
-
-	private static final Logger LOG =
-			Logger.getLogger(ContactSelectorFragment.class.getName());
+	public static final String TAG = ContactSelectorFragment.class.getName();
+	private static final Logger LOG = Logger.getLogger(TAG);
 
 	private ShareActivity shareActivity;
 	private Menu menu;
@@ -84,12 +82,7 @@ public class ContactSelectorFragment extends BaseFragment implements
 	@Override
 	public void onAttach(Context context) {
 		super.onAttach(context);
-		try {
-			shareActivity = (ShareActivity) context;
-		} catch (ClassCastException e) {
-			throw new InstantiationError(
-					"This fragment is only meant to be attached to a subclass of ShareActivity");
-		}
+		shareActivity = (ShareActivity) context;
 	}
 
 	@Override
@@ -221,7 +214,7 @@ public class ContactSelectorFragment extends BaseFragment implements
 	}
 
 	private void displayContacts(final List<ContactListItem> contacts) {
-		shareActivity.runOnUiThread(new Runnable() {
+		shareActivity.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				if (!contacts.isEmpty()) adapter.addAll(contacts);

briar-android/src/org/briarproject/android/sharing/InvitationsActivity.java

@@ -32,7 +32,7 @@ abstract class InvitationsActivity extends BriarActivity
 	private BriarRecyclerView list;
 
 	@Inject
-	protected EventBus eventBus;
+	EventBus eventBus;
 
 	@Override
 	public void onCreate(Bundle state) {
@@ -103,7 +103,7 @@ abstract class InvitationsActivity extends BriarActivity
 
 	protected void displayInvitations(
 			final Collection<InvitationItem> invitations, final boolean clear) {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				if (invitations.isEmpty()) {

briar-android/src/org/briarproject/android/sharing/ShareBlogMessageFragment.java

@@ -14,6 +14,7 @@ import org.briarproject.api.db.DbException;
 import org.briarproject.api.sync.GroupId;
 
 import java.util.Collection;
+import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
@@ -23,6 +24,7 @@ import static java.util.logging.Level.WARNING;
 public class ShareBlogMessageFragment extends ShareMessageFragment {
 
 	public final static String TAG = ShareBlogMessageFragment.class.getName();
+	private static final Logger LOG = Logger.getLogger(TAG);
 
 	// Fields that are accessed from background threads must be volatile
 	@Inject
@@ -52,6 +54,12 @@ public class ShareBlogMessageFragment extends ShareMessageFragment {
 		component.inject(this);
 	}
 
+	@Override
+	public String getUniqueTag() {
+		return TAG;
+	}
+
+	@Override
 	protected void share(final String msg) {
 		listener.runOnDbThread(new Runnable() {
 			@Override
@@ -69,8 +77,9 @@ public class ShareBlogMessageFragment extends ShareMessageFragment {
 		});
 	}
 
+	@Override
 	protected void sharingError() {
-		runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				int res = R.string.blogs_sharing_error;

briar-android/src/org/briarproject/android/sharing/ShareForumMessageFragment.java

@@ -14,6 +14,7 @@ import org.briarproject.api.forum.ForumSharingManager;
 import org.briarproject.api.sync.GroupId;
 
 import java.util.Collection;
+import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
@@ -23,6 +24,7 @@ import static java.util.logging.Level.WARNING;
 public class ShareForumMessageFragment extends ShareMessageFragment {
 
 	public final static String TAG = ShareForumMessageFragment.class.getName();
+	private static final Logger LOG = Logger.getLogger(TAG);
 
 	// Fields that are accessed from background threads must be volatile
 	@Inject
@@ -49,6 +51,12 @@ public class ShareForumMessageFragment extends ShareMessageFragment {
 		component.inject(this);
 	}
 
+	@Override
+	public String getUniqueTag() {
+		return TAG;
+	}
+
+	@Override
 	protected void share(final String msg) {
 		listener.runOnDbThread(new Runnable() {
 			@Override
@@ -67,8 +75,9 @@ public class ShareForumMessageFragment extends ShareMessageFragment {
 		});
 	}
 
+	@Override
 	protected void sharingError() {
-		runOnUiThread(new Runnable() {
+		listener.runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				int res = R.string.forum_share_error;

briar-android/src/org/briarproject/android/sharing/ShareMessageFragment.java

@@ -18,7 +18,6 @@ import org.briarproject.api.sync.GroupId;
 
 import java.util.ArrayList;
 import java.util.Collection;
-import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
@@ -29,10 +28,6 @@ import static org.briarproject.api.sharing.SharingConstants.GROUP_ID;
 abstract class ShareMessageFragment extends BaseFragment
 		implements TextInputListener {
 
-	public final static String TAG = ShareMessageFragment.class.getName();
-
-	protected static final Logger LOG = Logger.getLogger(TAG);
-
 	protected ViewHolder ui;
 	private ShareActivity shareActivity;
 
@@ -56,12 +51,7 @@ abstract class ShareMessageFragment extends BaseFragment
 	@Override
 	public void onAttach(Context context) {
 		super.onAttach(context);
-		try {
-			shareActivity = (ShareActivity) context;
-		} catch (ClassCastException e) {
-			throw new InstantiationError(
-					"This fragment is only meant to be attached to the ShareForumActivity");
-		}
+		shareActivity = (ShareActivity) context;
 	}
 
 	@Override
@@ -104,11 +94,6 @@ abstract class ShareMessageFragment extends BaseFragment
 		}
 	}
 
-	@Override
-	public String getUniqueTag() {
-		return TAG;
-	}
-
 	protected void setTitle(int res) {
 		shareActivity.setTitle(res);
 	}
@@ -136,10 +121,6 @@ abstract class ShareMessageFragment extends BaseFragment
 		return groupId;
 	}
 
-	protected void runOnUiThread(Runnable runnable) {
-		listener.runOnUiThread(runnable);
-	}
-
 	protected static class ViewHolder {
 		protected final LargeTextInputView message;
 

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

@@ -27,16 +27,16 @@ import static java.util.logging.Level.WARNING;
 
 abstract class SharingStatusActivity extends BriarActivity {
 
+	private static final Logger LOG =
+			Logger.getLogger(SharingStatusActivity.class.getName());
+
 	private GroupId groupId;
 	private BriarRecyclerView sharedByList, sharedWithList;
 	private SharingStatusAdapter sharedByAdapter, sharedWithAdapter;
 
 	// Fields that are accessed from background threads must be volatile
 	@Inject
-	protected volatile IdentityManager identityManager;
-
-	public final static String TAG = SharingStatusActivity.class.getName();
-	private static final Logger LOG = Logger.getLogger(TAG);
+	volatile IdentityManager identityManager;
 
 	@Override
 	public void onCreate(Bundle savedInstanceState) {
@@ -120,7 +120,7 @@ abstract class SharingStatusActivity extends BriarActivity {
 	}
 
 	private void displaySharedBy(final List<ContactListItem> contacts) {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				if (contacts.isEmpty()) {
@@ -156,7 +156,7 @@ abstract class SharingStatusActivity extends BriarActivity {
 	}
 
 	private void displaySharedWith(final List<ContactListItem> contacts) {
-		runOnUiThread(new Runnable() {
+		runOnUiThreadUnlessDestroyed(new Runnable() {
 			@Override
 			public void run() {
 				if (contacts.isEmpty()) {

briar-android/src/org/briarproject/android/view/TextInputView.java

@@ -24,17 +24,14 @@ import org.thoughtcrime.securesms.components.emoji.EmojiDrawer.EmojiEventListene
 import org.thoughtcrime.securesms.components.emoji.EmojiEditText;
 import org.thoughtcrime.securesms.components.emoji.EmojiToggle;
 
-import java.util.logging.Logger;
-
 import static android.content.Context.INPUT_METHOD_SERVICE;
+import static android.content.Context.LAYOUT_INFLATER_SERVICE;
+import static android.view.KeyEvent.KEYCODE_BACK;
 
 @UiThread
 public class TextInputView extends KeyboardAwareLinearLayout
 		implements EmojiEventListener {
 
-	private static final String TAG = TextInputView.class.getName();
-	private static final Logger LOG = Logger.getLogger(TAG);
-
 	protected final ViewHolder ui;
 	protected TextInputListener listener;
 
@@ -59,7 +56,7 @@ public class TextInputView extends KeyboardAwareLinearLayout
 
 	protected void inflateLayout(Context context) {
 		LayoutInflater inflater = (LayoutInflater) context
-				.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
+				.getSystemService(LAYOUT_INFLATER_SERVICE);
 		inflater.inflate(R.layout.text_input_view, this, true);
 	}
 
@@ -91,7 +88,7 @@ public class TextInputView extends KeyboardAwareLinearLayout
 		ui.editText.setOnKeyListener(new OnKeyListener() {
 			@Override
 			public boolean onKey(View v, int keyCode, KeyEvent event) {
-				if (keyCode == KeyEvent.KEYCODE_BACK && isEmojiDrawerOpen()) {
+				if (keyCode == KEYCODE_BACK && isEmojiDrawerOpen()) {
 					hideEmojiDrawer();
 					return true;
 				}
@@ -207,10 +204,11 @@ public class TextInputView extends KeyboardAwareLinearLayout
 	}
 
 	protected class ViewHolder {
+
 		private final EmojiToggle emojiToggle;
-		protected final EmojiEditText editText;
-		protected final View sendButton;
-		protected final EmojiDrawer emojiDrawer;
+		final EmojiEditText editText;
+		final View sendButton;
+		final EmojiDrawer emojiDrawer;
 
 		private ViewHolder() {
 			emojiToggle = (EmojiToggle) findViewById(R.id.emoji_toggle);