Add connection check button to Mailbox status UI

and update the last connection timestamp accordingly

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

@@ -47,11 +47,11 @@ public class MailboxActivity extends BriarActivity {
 		setContentView(R.layout.activity_mailbox);
 
 		progressBar = findViewById(R.id.progressBar);
-		if (viewModel.getState().getValue() == null) {
+		if (viewModel.getPairingState().getValue() == null) {
 			progressBar.setVisibility(VISIBLE);
 		}
 
-		viewModel.getState().observeEvent(this, state -> {
+		viewModel.getPairingState().observeEvent(this, state -> {
 			if (state instanceof MailboxState.NotSetup) {
 				onNotSetup();
 			} else if (state instanceof MailboxState.ShowDownload) {
@@ -85,7 +85,7 @@ public class MailboxActivity extends BriarActivity {
 
 	@Override
 	public void onBackPressed() {
-		MailboxState s = viewModel.getState().getLastValue();
+		MailboxState s = viewModel.getPairingState().getLastValue();
 		if (s instanceof MailboxState.Pairing) {
 			// don't go back in the flow if we are already pairing
 			// with the mailbox. We provide a try-again button instead.

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

@@ -1,7 +1,6 @@
 package org.briarproject.briar.android.mailbox;
 
 import org.briarproject.bramble.api.mailbox.MailboxPairingState;
-import org.briarproject.bramble.api.mailbox.MailboxStatus;
 
 class MailboxState {
 
@@ -29,11 +28,6 @@ class MailboxState {
 	}
 
 	static class IsPaired extends MailboxState {
-		final MailboxStatus mailboxStatus;
-
-		IsPaired(MailboxStatus mailboxStatus) {
-			this.mailboxStatus = mailboxStatus;
-		}
 	}
 
 }

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

@@ -2,11 +2,17 @@ package org.briarproject.briar.android.mailbox;
 
 import android.content.Context;
 import android.os.Bundle;
+import android.os.Handler;
+import android.os.Looper;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.Button;
+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;
 import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
 import org.briarproject.briar.R;
@@ -18,9 +24,13 @@ import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentActivity;
 import androidx.lifecycle.ViewModelProvider;
 
-import static java.util.Objects.requireNonNull;
+import static android.view.View.INVISIBLE;
+import static android.view.View.VISIBLE;
+import static androidx.transition.TransitionManager.beginDelayedTransition;
 import static org.briarproject.briar.android.AppModule.getAndroidComponent;
+import static org.briarproject.briar.android.util.UiUtils.MIN_DATE_RESOLUTION;
 import static org.briarproject.briar.android.util.UiUtils.formatDate;
+import static org.briarproject.briar.android.util.UiUtils.observeOnce;
 
 @MethodsNotNullByDefault
 @ParametersNotNullByDefault
@@ -32,6 +42,9 @@ public class MailboxStatusFragment extends Fragment {
 	ViewModelProvider.Factory viewModelFactory;
 
 	private MailboxViewModel viewModel;
+	private final Handler handler = new Handler(Looper.getMainLooper());
+
+	private TextView statusInfoView;
 
 	@Override
 	public void onAttach(Context context) {
@@ -54,11 +67,47 @@ public class MailboxStatusFragment extends Fragment {
 	@Override
 	public void onViewCreated(View v, @Nullable Bundle savedInstanceState) {
 		super.onViewCreated(v, savedInstanceState);
-		MailboxState.IsPaired state =
-				(MailboxState.IsPaired) viewModel.getState().getLastValue();
-		requireNonNull(state); // TODO check assumption
-		TextView statusInfoView = v.findViewById(R.id.statusInfoView);
-		long lastSuccess = state.mailboxStatus.getTimeOfLastSuccess();
+
+		Button checkButton = v.findViewById(R.id.checkButton);
+		ProgressBar checkProgress = v.findViewById(R.id.checkProgress);
+		checkButton.setOnClickListener(view -> {
+			beginDelayedTransition((ViewGroup) v);
+			checkButton.setVisibility(INVISIBLE);
+			checkProgress.setVisibility(VISIBLE);
+			observeOnce(viewModel.checkConnection(), this, result -> {
+				beginDelayedTransition((ViewGroup) v);
+				checkButton.setVisibility(VISIBLE);
+				checkProgress.setVisibility(INVISIBLE);
+			});
+		});
+
+		statusInfoView = v.findViewById(R.id.statusInfoView);
+		viewModel.getStatus()
+				.observe(getViewLifecycleOwner(), this::onMailboxStateChanged);
+
+		// TODO
+		//  * detect problems and show them #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());
+	}
+
+	@Override
+	public void onStart() {
+		super.onStart();
+		requireActivity().setTitle(R.string.mailbox_status_title);
+		handler.postDelayed(this::refreshLastConnection, MIN_DATE_RESOLUTION);
+	}
+
+	@Override
+	public void onStop() {
+		super.onStop();
+		handler.removeCallbacks(this::refreshLastConnection);
+	}
+
+	private void onMailboxStateChanged(MailboxStatus status) {
+		long lastSuccess = status.getTimeOfLastSuccess();
 		String lastConnectionText;
 		if (lastSuccess < 0) {
 			lastConnectionText =
@@ -69,18 +118,12 @@ public class MailboxStatusFragment extends Fragment {
 		String statusInfoText = getString(
 				R.string.mailbox_status_connected_info, lastConnectionText);
 		statusInfoView.setText(statusInfoText);
-		// TODO
-		//  * react to status changes
-		//  * detect problems and show them
-		//  * update connection time periodically like conversation timestamps
-		//  * add "Check connection" button
-		//  * add "Unlink" button with confirmation dialog
 	}
 
-	@Override
-	public void onStart() {
-		super.onStart();
-		requireActivity().setTitle(R.string.mailbox_status_title);
+	private void refreshLastConnection() {
+		MailboxStatus status = viewModel.getStatus().getValue();
+		if (status != null) onMailboxStateChanged(status);
+		handler.postDelayed(this::refreshLastConnection, MIN_DATE_RESOLUTION);
 	}
 
 }

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

@@ -7,12 +7,16 @@ import com.google.zxing.Result;
 import org.briarproject.bramble.api.Consumer;
 import org.briarproject.bramble.api.db.DatabaseExecutor;
 import org.briarproject.bramble.api.db.TransactionManager;
+import org.briarproject.bramble.api.event.Event;
+import org.briarproject.bramble.api.event.EventBus;
+import org.briarproject.bramble.api.event.EventListener;
 import org.briarproject.bramble.api.lifecycle.IoExecutor;
 import org.briarproject.bramble.api.lifecycle.LifecycleManager;
 import org.briarproject.bramble.api.mailbox.MailboxManager;
 import org.briarproject.bramble.api.mailbox.MailboxPairingState;
 import org.briarproject.bramble.api.mailbox.MailboxPairingTask;
 import org.briarproject.bramble.api.mailbox.MailboxStatus;
+import org.briarproject.bramble.api.mailbox.OwnMailboxConnectionStatusEvent;
 import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
 import org.briarproject.bramble.api.plugin.Plugin;
 import org.briarproject.bramble.api.plugin.PluginManager;
@@ -32,6 +36,8 @@ import javax.inject.Inject;
 import androidx.annotation.AnyThread;
 import androidx.annotation.Nullable;
 import androidx.annotation.UiThread;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
 
 import static java.util.logging.Level.INFO;
 import static java.util.logging.Logger.getLogger;
@@ -39,17 +45,21 @@ import static org.briarproject.bramble.api.plugin.Plugin.State.ACTIVE;
 
 @NotNullByDefault
 class MailboxViewModel extends DbViewModel
-		implements QrCodeDecoder.ResultCallback, Consumer<MailboxPairingState> {
+		implements QrCodeDecoder.ResultCallback, Consumer<MailboxPairingState>,
+		EventListener {
 
 	private static final Logger LOG =
 			getLogger(MailboxViewModel.class.getName());
 
+	private final EventBus eventBus;
 	private final QrCodeDecoder qrCodeDecoder;
 	private final PluginManager pluginManager;
 	private final MailboxManager mailboxManager;
 
-	private final MutableLiveEvent<MailboxState> state =
+	private final MutableLiveEvent<MailboxState> pairingState =
 			new MutableLiveEvent<>();
+	private final MutableLiveData<MailboxStatus> status =
+			new MutableLiveData<>();
 	@Nullable
 	private MailboxPairingTask pairingTask = null;
 
@@ -60,19 +70,23 @@ class MailboxViewModel extends DbViewModel
 			LifecycleManager lifecycleManager,
 			TransactionManager db,
 			AndroidExecutor androidExecutor,
+			EventBus eventBus,
 			@IoExecutor Executor ioExecutor,
 			PluginManager pluginManager,
 			MailboxManager mailboxManager) {
 		super(app, dbExecutor, lifecycleManager, db, androidExecutor);
+		this.eventBus = eventBus;
 		this.pluginManager = pluginManager;
 		this.mailboxManager = mailboxManager;
 		qrCodeDecoder = new QrCodeDecoder(androidExecutor, ioExecutor, this);
+		eventBus.addListener(this);
 		checkIfSetup();
 	}
 
 	@Override
 	protected void onCleared() {
 		super.onCleared();
+		eventBus.removeListener(this);
 		MailboxPairingTask task = pairingTask;
 		if (task != null) {
 			task.removeObserver(this);
@@ -89,9 +103,10 @@ class MailboxViewModel extends DbViewModel
 				if (isPaired) {
 					MailboxStatus mailboxStatus =
 							mailboxManager.getMailboxStatus(txn);
-					state.postEvent(new MailboxState.IsPaired(mailboxStatus));
+					pairingState.postEvent(new MailboxState.IsPaired());
+					status.postValue(mailboxStatus);
 				} else {
-					state.postEvent(new NotSetup());
+					pairingState.postEvent(new NotSetup());
 				}
 			}, this::handleException);
 		} else {
@@ -100,18 +115,28 @@ class MailboxViewModel extends DbViewModel
 		}
 	}
 
+	@UiThread
+	@Override
+	public void eventOccurred(Event e) {
+		if (e instanceof OwnMailboxConnectionStatusEvent) {
+			MailboxStatus status =
+					((OwnMailboxConnectionStatusEvent) e).getStatus();
+			this.status.setValue(status);
+		}
+	}
+
 	@UiThread
 	void onScanButtonClicked() {
 		if (isTorActive()) {
-			state.setEvent(new MailboxState.ScanningQrCode());
+			pairingState.setEvent(new MailboxState.ScanningQrCode());
 		} else {
-			state.setEvent(new MailboxState.OfflineWhenPairing());
+			pairingState.setEvent(new MailboxState.OfflineWhenPairing());
 		}
 	}
 
 	@UiThread
 	void onCameraError() {
-		state.setEvent(new MailboxState.CameraError());
+		pairingState.setEvent(new MailboxState.CameraError());
 	}
 
 	@Override
@@ -127,7 +152,7 @@ class MailboxViewModel extends DbViewModel
 			pairingTask = mailboxManager.startPairingTask(qrCodePayload);
 			pairingTask.addObserver(this);
 		} else {
-			state.postEvent(new MailboxState.OfflineWhenPairing());
+			pairingState.postEvent(new MailboxState.OfflineWhenPairing());
 		}
 	}
 
@@ -138,7 +163,7 @@ class MailboxViewModel extends DbViewModel
 			LOG.info("New pairing state: " +
 					mailboxPairingState.getClass().getSimpleName());
 		}
-		state.setEvent(new MailboxState.Pairing(mailboxPairingState));
+		pairingState.setEvent(new MailboxState.Pairing(mailboxPairingState));
 	}
 
 	private boolean isTorActive() {
@@ -148,7 +173,7 @@ class MailboxViewModel extends DbViewModel
 
 	@UiThread
 	void showDownloadFragment() {
-		state.setEvent(new MailboxState.ShowDownload());
+		pairingState.setEvent(new MailboxState.ShowDownload());
 	}
 
 	@UiThread
@@ -156,8 +181,29 @@ class MailboxViewModel extends DbViewModel
 		return qrCodeDecoder;
 	}
 
+	LiveData<Boolean> checkConnection() {
+		MutableLiveData<Boolean> liveData = new MutableLiveData<>();
+		mailboxManager.checkConnection(result ->
+				onConnectionCheckFinished(liveData, result));
+		return liveData;
+	}
+
+	@IoExecutor
+	private void onConnectionCheckFinished(MutableLiveData<Boolean> liveData,
+			boolean success) {
+		if (LOG.isLoggable(INFO)) {
+			LOG.info("Got result from connection check: " + success);
+		}
+		liveData.postValue(success);
+	}
+
 	@UiThread
-	LiveEvent<MailboxState> getState() {
-		return state;
+	LiveEvent<MailboxState> getPairingState() {
+		return pairingState;
+	}
+
+	@UiThread
+	LiveData<MailboxStatus> getStatus() {
+		return status;
 	}
 }

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

@@ -10,13 +10,14 @@
 		android:id="@+id/imageView"
 		android:layout_width="32dp"
 		android:layout_height="32dp"
-		android:layout_marginStart="16dp"
-		android:layout_marginLeft="16dp"
-		app:layout_constraintBottom_toBottomOf="parent"
-		app:layout_constraintEnd_toStartOf="@+id/statusTitleView"
+		android:layout_marginHorizontal="16dp"
+		app:layout_constraintBottom_toTopOf="@+id/statusTitleView"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintHorizontal_bias="0.5"
 		app:layout_constraintHorizontal_chainStyle="packed"
 		app:layout_constraintStart_toStartOf="parent"
 		app:layout_constraintTop_toTopOf="parent"
+		app:layout_constraintVertical_bias="0.25"
 		app:layout_constraintVertical_chainStyle="packed"
 		app:srcCompat="@drawable/ic_check_circle_outline"
 		app:tint="@color/briar_brand_green"
@@ -26,14 +27,37 @@
 		android:id="@+id/statusTitleView"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
-		android:layout_marginHorizontal="16dp"
+		android:layout_margin="16dp"
 		android:text="@string/mailbox_status_connected_title"
 		android:textAppearance="@style/TextAppearance.MaterialComponents.Headline6"
 		app:layout_constrainedWidth="true"
-		app:layout_constraintBottom_toBottomOf="@+id/imageView"
+		app:layout_constraintBottom_toTopOf="@+id/checkButton"
 		app:layout_constraintEnd_toEndOf="parent"
-		app:layout_constraintStart_toEndOf="@+id/imageView"
-		app:layout_constraintTop_toTopOf="@+id/imageView" />
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toBottomOf="@+id/imageView" />
+
+	<Button
+		android:id="@+id/checkButton"
+		style="@style/BriarButtonFlat.Neutral"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_marginHorizontal="16dp"
+		android:text="@string/mailbox_status_check_button"
+		app:layout_constraintBottom_toTopOf="@+id/statusInfoView"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent"
+		app:layout_constraintTop_toBottomOf="@+id/statusTitleView" />
+
+	<ProgressBar
+		android:id="@+id/checkProgress"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:visibility="invisible"
+		app:layout_constraintBottom_toBottomOf="@+id/checkButton"
+		app:layout_constraintEnd_toEndOf="@+id/checkButton"
+		app:layout_constraintStart_toStartOf="@+id/checkButton"
+		app:layout_constraintTop_toTopOf="@+id/checkButton"
+		tools:visibility="visible" />
 
 	<TextView
 		android:id="@+id/statusInfoView"
@@ -41,11 +65,21 @@
 		android:layout_height="wrap_content"
 		android:layout_margin="16dp"
 		android:gravity="center"
-		app:layout_constraintBottom_toBottomOf="parent"
+		app:layout_constraintBottom_toTopOf="@+id/unlinkButton"
 		app:layout_constraintEnd_toEndOf="parent"
 		app:layout_constraintStart_toStartOf="parent"
-		app:layout_constraintTop_toBottomOf="@+id/statusTitleView"
-		app:layout_constraintVertical_bias="0.0"
+		app:layout_constraintTop_toBottomOf="@+id/checkButton"
 		tools:text="@string/mailbox_status_connected_info" />
 
+	<Button
+		android:id="@+id/unlinkButton"
+		style="@style/BriarButtonFlat.Negative"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_margin="16dp"
+		android:text="@string/mailbox_status_unlink_button"
+		app:layout_constraintBottom_toBottomOf="parent"
+		app:layout_constraintEnd_toEndOf="parent"
+		app:layout_constraintStart_toStartOf="parent" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -643,10 +643,12 @@
 	<string name="tor_offline_button_check">Check connection settings</string>
 	<string name="mailbox_status_title">Mailbox status</string>
 	<string name="mailbox_status_connected_title">Mailbox is running</string>
+	<string name="mailbox_status_check_button">Check Connection</string>
 	<!-- Example for string substitution: Last connection: 3min ago-->
 	<string name="mailbox_status_connected_info">Last connection: %s</string>
 	<!-- 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>
 
 	<!-- Conversation Settings -->
 	<string name="disappearing_messages_title">Disappearing messages</string>