Use BriarActivity#signOut() to exit app after updating language

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

@@ -179,6 +179,13 @@ class LifecycleManagerImpl implements LifecycleManager, MigrationListener {
 			LOG.info("Stopping services");
 			state = STOPPING;
 			eventBus.broadcast(new LifecycleEvent(STOPPING));
+			LOG.info("Sleeping a bit to simulate slowness");
+			try {
+				Thread.sleep(5000);
+			} catch (InterruptedException e) {
+				e.printStackTrace();
+			}
+			LOG.info("Done simulating slowness");
 			for (Service s : services) {
 				long start = now();
 				s.stopService();

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

@@ -37,6 +37,7 @@ import org.briarproject.briar.android.conversation.glide.BriarModelLoader;
 import org.briarproject.briar.android.logging.CachingLogHandler;
 import org.briarproject.briar.android.login.SignInReminderReceiver;
 import org.briarproject.briar.android.settings.ConnectionsFragment;
+import org.briarproject.briar.android.settings.DisplayFragment;
 import org.briarproject.briar.android.settings.NotificationsFragment;
 import org.briarproject.briar.android.settings.SecurityFragment;
 import org.briarproject.briar.android.settings.SettingsFragment;
@@ -200,6 +201,8 @@ public interface AndroidComponent
 
 	void inject(SettingsFragment settingsFragment);
 
+	void inject(DisplayFragment displayFragment);
+
 	void inject(ConnectionsFragment connectionsFragment);
 
 	void inject(SecurityFragment securityFragment);

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

@@ -97,8 +97,6 @@ public class NavDrawerActivity extends BriarActivity implements
 			Uri.parse("briar-content://org.briarproject.briar/blog");
 	public static Uri CONTACT_ADDED_URI =
 			Uri.parse("briar-content://org.briarproject.briar/contact/added");
-	public static Uri SIGN_OUT_URI =
-			Uri.parse("briar-content://org.briarproject.briar/sign-out");
 
 	private final List<Transport> transports = new ArrayList<>(3);
 	private final MutableLiveData<ImageView> torIcon = new MutableLiveData<>();
@@ -224,8 +222,6 @@ public class NavDrawerActivity extends BriarActivity implements
 			startFragment(ForumListFragment.newInstance(), R.id.nav_btn_forums);
 		} else if (BLOG_URI.equals(uri)) {
 			startFragment(FeedFragment.newInstance(), R.id.nav_btn_blogs);
-		} else if (SIGN_OUT_URI.equals(uri)) {
-			signOut(false, false);
 		}
 	}
 

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

 package org.briarproject.briar.android.settings;
 
 import android.app.AlertDialog;
+import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
 
@@ -15,22 +16,25 @@ import java.util.List;
 import java.util.Locale;
 import java.util.logging.Logger;
 
+import javax.inject.Inject;
+
+import androidx.annotation.NonNull;
 import androidx.core.text.TextUtilsCompat;
 import androidx.fragment.app.FragmentActivity;
+import androidx.lifecycle.ViewModelProvider;
 import androidx.preference.ListPreference;
 import androidx.preference.Preference;
 import androidx.preference.PreferenceFragmentCompat;
 
 import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TASK;
-import static android.content.Intent.FLAG_ACTIVITY_CLEAR_TOP;
 import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
 import static android.os.Build.VERSION.SDK_INT;
 import static androidx.core.view.ViewCompat.LAYOUT_DIRECTION_LTR;
 import static java.util.Objects.requireNonNull;
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Logger.getLogger;
+import static org.briarproject.briar.android.AppModule.getAndroidComponent;
 import static org.briarproject.briar.android.BriarApplication.ENTRY_ACTIVITY;
-import static org.briarproject.briar.android.navdrawer.NavDrawerActivity.SIGN_OUT_URI;
 import static org.briarproject.briar.android.settings.SettingsActivity.EXTRA_THEME_CHANGE;
 
 @NotNullByDefault
@@ -42,6 +46,19 @@ public class DisplayFragment extends PreferenceFragmentCompat {
 	private static final Logger LOG =
 			getLogger(DisplayFragment.class.getName());
 
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+
+	private SettingsViewModel viewModel;
+
+	@Override
+	public void onAttach(@NonNull Context context) {
+		super.onAttach(context);
+		getAndroidComponent(context).inject(this);
+		viewModel = new ViewModelProvider(requireActivity(), viewModelFactory)
+				.get(SettingsViewModel.class);
+	}
+
 	@Override
 	public void onCreatePreferences(Bundle bundle, String s) {
 		addPreferencesFromResource(R.xml.settings_display);
@@ -148,11 +165,7 @@ public class DisplayFragment extends PreferenceFragmentCompat {
 			builder.setMessage(R.string.pref_language_changed);
 			builder.setPositiveButton(R.string.sign_out_button, (d, i) -> {
 				language.setValue((String) newValue);
-				Intent intent = new Intent(getContext(), ENTRY_ACTIVITY);
-				intent.setFlags(FLAG_ACTIVITY_CLEAR_TOP);
-				intent.setData(SIGN_OUT_URI);
-				requireActivity().startActivity(intent);
-				requireActivity().finish();
+				viewModel.languageChanged();
 			});
 			builder.setNegativeButton(R.string.cancel, null);
 			builder.setCancelable(false);

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

@@ -9,11 +9,14 @@ import org.briarproject.briar.R;
 import org.briarproject.briar.android.activity.ActivityComponent;
 import org.briarproject.briar.android.activity.BriarActivity;
 
+import javax.inject.Inject;
+
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.ActionBar;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentFactory;
 import androidx.fragment.app.FragmentManager;
+import androidx.lifecycle.ViewModelProvider;
 import androidx.preference.Preference;
 import androidx.preference.PreferenceFragmentCompat;
 import androidx.preference.PreferenceFragmentCompat.OnPreferenceStartFragmentCallback;
@@ -25,6 +28,11 @@ public class SettingsActivity extends BriarActivity
 
 	static final String EXTRA_THEME_CHANGE = "themeChange";
 
+	@Inject
+	ViewModelProvider.Factory viewModelFactory;
+
+	private SettingsViewModel viewModel;
+
 	@Override
 	public void injectActivity(ActivityComponent component) {
 		component.inject(this);
@@ -49,6 +57,15 @@ public class SettingsActivity extends BriarActivity
 		}
 
 		setContentView(R.layout.activity_settings);
+
+		ViewModelProvider provider =
+				new ViewModelProvider(this, viewModelFactory);
+		viewModel = provider.get(SettingsViewModel.class);
+
+		viewModel.getLanguageChange().observeEvent(this, b -> {
+			signOut(false, false);
+			finishAffinity();
+		});
 	}
 
 	@Override

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

@@ -31,6 +31,8 @@ import org.briarproject.briar.R;
 import org.briarproject.briar.android.attachment.UnsupportedMimeTypeException;
 import org.briarproject.briar.android.attachment.media.ImageCompressor;
 import org.briarproject.briar.android.viewmodel.DbViewModel;
+import org.briarproject.briar.android.viewmodel.LiveEvent;
+import org.briarproject.briar.android.viewmodel.MutableLiveEvent;
 import org.briarproject.briar.api.avatar.AvatarManager;
 import org.briarproject.briar.api.identity.AuthorInfo;
 import org.briarproject.briar.api.identity.AuthorManager;
@@ -92,6 +94,8 @@ class SettingsViewModel extends DbViewModel implements EventListener {
 			new MutableLiveData<>();
 	private final MutableLiveData<String> screenLockTimeout =
 			new MutableLiveData<>();
+	private final MutableLiveEvent<Boolean> languageChanged =
+			new MutableLiveEvent<>();
 
 	@Inject
 	SettingsViewModel(Application application,
@@ -250,6 +254,10 @@ class SettingsViewModel extends DbViewModel implements EventListener {
 				.show());
 	}
 
+	void languageChanged() {
+		languageChanged.setEvent(true);
+	}
+
 	LiveData<OwnIdentityInfo> getOwnIdentityInfo() {
 		return ownIdentityInfo;
 	}
@@ -262,4 +270,8 @@ class SettingsViewModel extends DbViewModel implements EventListener {
 		return screenLockTimeout;
 	}
 
+	LiveEvent<Boolean> getLanguageChange() {
+		return languageChanged;
+	}
+
 }