Implement UI for dissolving and leaving group

briar-android/res/menu/group_actions.xml

@@ -25,15 +25,12 @@
 
 	<item
 		android:id="@+id/action_group_leave"
-		android:enabled="false"
 		android:icon="@drawable/action_delete_white"
 		android:title="@string/groups_leave"
-		android:visible="false"
 		app:showAsAction="never"/>
 
 	<item
 		android:id="@+id/action_group_dissolve"
-		android:enabled="false"
 		android:icon="@drawable/action_delete_white"
 		android:title="@string/groups_dissolve"
 		app:showAsAction="never"/>

briar-android/res/values/strings.xml

@@ -163,6 +163,8 @@
 	<string name="groups_member_list">Member List</string>
 	<string name="groups_invite_members">Invite Members</string>
 	<string name="groups_leave">Leave Group</string>
+	<string name="groups_leave_dialog_title">Confirm Leaving Group</string>
+	<string name="groups_leave_dialog_message">Are you sure that you want to leave this group?</string>
 	<string name="groups_dissolve">Dissolve Group</string>
 	<string name="groups_member_joined">joined the group.</string>
 
@@ -180,6 +182,9 @@
 	<string name="groups_invitations_response_declined_sent">You declined the group invitation from %s.</string>
 	<string name="groups_invitations_response_accepted_received">%s accepted your group invitation.</string>
 	<string name="groups_invitations_response_declined_received">%s declined your group invitation.</string>
+	<string name="groups_dissolve_dialog_title">Confirm Dissolving Group</string>
+	<string name="groups_dissolve_dialog_message">Are you sure that you want to dissolve this group?\n\nAll other members will not be able to continue their conversation and might not receive the latest messages.</string>
+	<string name="groups_dissolve_button">Dissolve</string>
 
 	<!-- Forums -->
 	<string name="no_forums">You don\'t have any forums yet.\n\nWhy don\'t you create a new one yourself by tapping the + icon at the top?\n\nYou can also ask your contacts to share forums with you.</string>

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

@@ -149,11 +149,11 @@ public class ForumActivity extends
 		OnClickListener okListener = new OnClickListener() {
 			@Override
 			public void onClick(DialogInterface dialog, int which) {
-				deleteNamedGroup();
+				deleteForum();
 			}
 		};
-		AlertDialog.Builder builder = new AlertDialog.Builder(
+		AlertDialog.Builder builder = new AlertDialog.Builder(this,
-				ForumActivity.this, R.style.BriarDialogTheme);
+				R.style.BriarDialogTheme);
 		builder.setTitle(getString(R.string.dialog_title_leave_forum));
 		builder.setMessage(getString(R.string.dialog_message_leave_forum));
 		builder.setNegativeButton(R.string.dialog_button_leave, okListener);
@@ -161,7 +161,7 @@ public class ForumActivity extends
 		builder.show();
 	}
 
-	private void deleteNamedGroup() {
+	private void deleteForum() {
 		forumController.deleteNamedGroup(
 				new UiResultExceptionHandler<Void, DbException>(this) {
 					@Override

briar-android/src/org/briarproject/android/privategroup/conversation/GroupActivity.java

@@ -1,10 +1,13 @@
 package org.briarproject.android.privategroup.conversation;
 
+import android.content.DialogInterface;
+import android.content.DialogInterface.OnClickListener;
 import android.content.Intent;
 import android.os.Bundle;
 import android.support.annotation.LayoutRes;
 import android.support.annotation.StringRes;
 import android.support.v7.app.ActionBar;
+import android.support.v7.app.AlertDialog;
 import android.support.v7.widget.LinearLayoutManager;
 import android.view.Menu;
 import android.view.MenuInflater;
@@ -12,8 +15,10 @@ import android.view.MenuItem;
 
 import org.briarproject.R;
 import org.briarproject.android.ActivityComponent;
+import org.briarproject.android.controller.handler.UiResultExceptionHandler;
 import org.briarproject.android.threaded.ThreadListActivity;
 import org.briarproject.android.threaded.ThreadListController;
+import org.briarproject.api.db.DbException;
 import org.briarproject.api.privategroup.GroupMessageHeader;
 import org.briarproject.api.privategroup.PrivateGroup;
 
@@ -22,11 +27,16 @@ import javax.inject.Inject;
 import static org.briarproject.api.privategroup.PrivateGroupConstants.MAX_GROUP_POST_BODY_LENGTH;
 
 public class GroupActivity extends
-		ThreadListActivity<PrivateGroup, GroupMessageItem, GroupMessageHeader> {
+		ThreadListActivity<PrivateGroup, GroupMessageItem, GroupMessageHeader>
+		implements OnClickListener {
 
 	@Inject
 	GroupController controller;
 
+	private boolean isCreator;
+	private MenuItem leaveMenuItem;
+	private MenuItem dissolveMenuItem;
+
 	@Override
 	public void injectActivity(ActivityComponent component) {
 		component.inject(this);
@@ -58,6 +68,20 @@ public class GroupActivity extends
 			actionBar.setSubtitle(getString(R.string.groups_created_by,
 					group.getAuthor().getName()));
 		}
+		controller.isCreator(group,
+				new UiResultExceptionHandler<Boolean, DbException>(this) {
+					@Override
+					public void onResultUi(Boolean isCreator) {
+						GroupActivity.this.isCreator = isCreator;
+						showMenuItems();
+					}
+
+					@Override
+					public void onExceptionUi(DbException exception) {
+						// TODO proper error handling
+						finish();
+					}
+				});
 	}
 
 	@Override
@@ -78,6 +102,10 @@ public class GroupActivity extends
 		MenuInflater inflater = getMenuInflater();
 		inflater.inflate(R.menu.group_actions, menu);
 
+		leaveMenuItem = menu.findItem(R.id.action_group_leave);
+		dissolveMenuItem = menu.findItem(R.id.action_group_dissolve);
+		showMenuItems();
+
 		return super.onCreateOptionsMenu(menu);
 	}
 
@@ -87,6 +115,12 @@ public class GroupActivity extends
 			case R.id.action_group_compose_message:
 				showTextInput(null);
 				return true;
+			case R.id.action_group_leave:
+				showLeaveGroupDialog();
+				return true;
+			case R.id.action_group_dissolve:
+				showDissolveGroupDialog();
+				return true;
 			default:
 				return super.onOptionsItemSelected(item);
 		}
@@ -109,4 +143,53 @@ public class GroupActivity extends
 		return R.string.groups_message_received;
 	}
 
+	private void showMenuItems() {
+		if (leaveMenuItem == null || dissolveMenuItem == null) return;
+		if (isCreator) {
+			leaveMenuItem.setVisible(false);
+			dissolveMenuItem.setVisible(true);
+		} else {
+			leaveMenuItem.setVisible(true);
+			dissolveMenuItem.setVisible(false);
+		}
+	}
+
+	private void showLeaveGroupDialog() {
+		AlertDialog.Builder builder =
+				new AlertDialog.Builder(this, R.style.BriarDialogTheme);
+		builder.setTitle(getString(R.string.groups_leave_dialog_title));
+		builder.setMessage(getString(R.string.groups_leave_dialog_message));
+		builder.setNegativeButton(R.string.dialog_button_leave, this);
+		builder.setPositiveButton(R.string.cancel, null);
+		builder.show();
+	}
+
+	private void showDissolveGroupDialog() {
+		AlertDialog.Builder builder =
+				new AlertDialog.Builder(this, R.style.BriarDialogTheme);
+		builder.setTitle(getString(R.string.groups_dissolve_dialog_title));
+		builder.setMessage(getString(R.string.groups_dissolve_dialog_message));
+		builder.setNegativeButton(R.string.groups_dissolve_button, this);
+		builder.setPositiveButton(R.string.cancel, null);
+		builder.show();
+	}
+
+	@Override
+	public void onClick(DialogInterface dialog, int which) {
+		controller.deleteNamedGroup(
+				new UiResultExceptionHandler<Void, DbException>(this) {
+					@Override
+					public void onResultUi(Void v) {
+						// The activity is going to be destroyed by the
+						// GroupRemovedEvent being fired
+					}
+
+					@Override
+					public void onExceptionUi(DbException exception) {
+						// TODO proper error handling
+						finish();
+					}
+				});
+	}
+
 }

briar-android/src/org/briarproject/android/privategroup/conversation/GroupController.java

@@ -1,6 +1,8 @@
 package org.briarproject.android.privategroup.conversation;
 
+import org.briarproject.android.controller.handler.ResultExceptionHandler;
 import org.briarproject.android.threaded.ThreadListController;
+import org.briarproject.api.db.DbException;
 import org.briarproject.api.privategroup.GroupMessageHeader;
 import org.briarproject.api.privategroup.PrivateGroup;
 
@@ -8,4 +10,7 @@ public interface GroupController
 		extends
 		ThreadListController<PrivateGroup, GroupMessageItem, GroupMessageHeader> {
 
+	void isCreator(PrivateGroup group,
+			ResultExceptionHandler<Boolean, DbException> handler);
+
 }

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

@@ -30,6 +30,7 @@ import java.util.logging.Logger;
 import javax.inject.Inject;
 
 import static java.lang.Math.max;
+
 import static java.util.logging.Level.WARNING;
 
 public class GroupControllerImpl extends
@@ -174,4 +175,24 @@ public class GroupControllerImpl extends
 		return new GroupMessageItem(header, body);
 	}
 
+	@Override
+	public void isCreator(final PrivateGroup group,
+			final ResultExceptionHandler<Boolean, DbException> handler) {
+		runOnDbThread(new Runnable() {
+			@Override
+			public void run() {
+				try {
+					LocalAuthor author = identityManager.getLocalAuthor();
+					boolean isCreator =
+							author.getId().equals(group.getAuthor().getId());
+					handler.onResult(isCreator);
+				} catch (DbException e) {
+					if (LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+					handler.onException(e);
+				}
+			}
+		});
+	}
+
 }

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

@@ -41,16 +41,14 @@ public abstract class ThreadListControllerImpl<G extends NamedGroup, I extends T
 	private static final Logger LOG =
 			Logger.getLogger(ThreadListControllerImpl.class.getName());
 
-	protected final IdentityManager identityManager;
-	protected final Executor cryptoExecutor;
-	protected final AndroidNotificationManager notificationManager;
-	protected final Clock clock;
 	private final EventBus eventBus;
-
 	private final Map<MessageId, String> bodyCache = new ConcurrentHashMap<>();
-
 	private volatile GroupId groupId;
 
+	protected final IdentityManager identityManager;
+	protected final AndroidNotificationManager notificationManager;
+	protected final Executor cryptoExecutor;
+	protected final Clock clock;
 	protected volatile ThreadListListener<H> listener;
 
 	protected ThreadListControllerImpl(@DatabaseExecutor Executor dbExecutor,