Implement UI for unpairing the mailbox

briar-android/src/main/java/org/briarproject/briar/android/mailbox/MailboxStatusFragment.java

@@ -12,7 +12,6 @@ import android.widget.Button;
 import android.widget.ImageView;
 import android.widget.ProgressBar;
 import android.widget.TextView;
-import android.widget.Toast;
 
 import org.briarproject.bramble.api.mailbox.MailboxStatus;
 import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
@@ -25,6 +24,7 @@ import androidx.annotation.ColorRes;
 import androidx.annotation.DrawableRes;
 import androidx.annotation.Nullable;
 import androidx.annotation.UiThread;
+import androidx.appcompat.app.AlertDialog;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentActivity;
 import androidx.lifecycle.ViewModelProvider;
@@ -57,6 +57,8 @@ public class MailboxStatusFragment extends Fragment {
 	private ImageView imageView;
 	private TextView statusTitleView;
 	private TextView statusInfoView;
+	private Button unlinkButton;
+	private ProgressBar unlinkProgress;
 
 	@Override
 	public void onAttach(Context context) {
@@ -101,10 +103,9 @@ public class MailboxStatusFragment extends Fragment {
 
 		// TODO
 		//  * Implement UI for warning user when mailbox is unreachable #2175
-		//  * add "Unlink" button confirmation dialog and functionality #2173
-		Button unlinkButton = v.findViewById(R.id.unlinkButton);
-		unlinkButton.setOnClickListener(view -> Toast.makeText(requireContext(),
-				"NOT IMPLEMENTED", Toast.LENGTH_SHORT).show());
+		unlinkButton = v.findViewById(R.id.unlinkButton);
+		unlinkProgress = v.findViewById(R.id.unlinkProgress);
+		unlinkButton.setOnClickListener(view -> onUnlinkButtonClicked());
 	}
 
 	@Override
@@ -167,4 +168,21 @@ public class MailboxStatusFragment extends Fragment {
 		}
 	}
 
+	private void onUnlinkButtonClicked() {
+		AlertDialog.Builder builder = new AlertDialog.Builder(requireContext(),
+				R.style.BriarDialogTheme);
+		builder.setTitle(R.string.mailbox_status_unlink_dialog_title);
+		builder.setMessage(R.string.mailbox_status_unlink_dialog_message);
+		builder.setPositiveButton(R.string.cancel,
+				(dialog, which) -> dialog.cancel());
+		builder.setNegativeButton(R.string.mailbox_status_unlink_button,
+				(dialog, which) -> {
+					beginDelayedTransition((ViewGroup) requireView());
+					unlinkButton.setVisibility(INVISIBLE);
+					unlinkProgress.setVisibility(VISIBLE);
+					viewModel.unlink();
+				});
+		builder.show();
+	}
+
 }

briar-android/src/main/java/org/briarproject/briar/android/mailbox/MailboxViewModel.java

@@ -6,6 +6,7 @@ import com.google.zxing.Result;
 
 import org.briarproject.bramble.api.Consumer;
 import org.briarproject.bramble.api.db.DatabaseExecutor;
+import org.briarproject.bramble.api.db.DbException;
 import org.briarproject.bramble.api.db.TransactionManager;
 import org.briarproject.bramble.api.event.Event;
 import org.briarproject.bramble.api.event.EventBus;
@@ -220,6 +221,18 @@ class MailboxViewModel extends DbViewModel
 		return liveData;
 	}
 
+	@UiThread
+	void unlink() {
+		ioExecutor.execute(() -> {
+			try {
+				mailboxManager.unPair();
+				pairingState.postEvent(new MailboxState.NotSetup());
+			} catch (DbException e) {
+				handleException(e);
+			}
+		});
+	}
+
 	@UiThread
 	LiveEvent<MailboxState> getPairingState() {
 		return pairingState;

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

@@ -83,4 +83,15 @@
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent" />
 
+	<ProgressBar
+		android:id="@+id/unlinkProgress"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:visibility="invisible"
+		app:layout_constraintBottom_toBottomOf="@+id/unlinkButton"
+		app:layout_constraintEnd_toEndOf="@+id/unlinkButton"
+		app:layout_constraintStart_toStartOf="@+id/unlinkButton"
+		app:layout_constraintTop_toTopOf="@+id/unlinkButton"
+		tools:visibility="visible" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -651,6 +651,8 @@
 	<!-- Indicates that there never was a connection to the mailbox. Last connection: Never -->
 	<string name="mailbox_status_connected_never">Never</string>
 	<string name="mailbox_status_unlink_button">Unlink</string>
+	<string name="mailbox_status_unlink_dialog_title">Unlink mailbox?</string>
+	<string name="mailbox_status_unlink_dialog_message">Unlinking a working Mailbox will result in message delivery issues, even when relinking it later again.</string>
 
 	<!-- Conversation Settings -->
 	<string name="disappearing_messages_title">Disappearing messages</string>