Simple version of Connect via Bluetooth UI

briar-android/src/main/java/org/briarproject/briar/android/conversation/BluetoothConnecter.java

@@ -0,0 +1,120 @@
+package org.briarproject.briar.android.conversation;
+
+import android.app.Application;
+import android.bluetooth.BluetoothAdapter;
+import android.content.Context;
+import android.widget.Toast;
+
+import org.briarproject.bramble.api.lifecycle.IoExecutor;
+import org.briarproject.bramble.api.plugin.BluetoothConstants;
+import org.briarproject.bramble.api.plugin.Plugin;
+import org.briarproject.bramble.api.plugin.PluginManager;
+import org.briarproject.bramble.api.system.AndroidExecutor;
+import org.briarproject.briar.R;
+import org.briarproject.briar.android.contact.ContactItem;
+
+import java.util.Random;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import androidx.activity.result.ActivityResultLauncher;
+import androidx.annotation.StringRes;
+import androidx.annotation.UiThread;
+import androidx.appcompat.app.AlertDialog;
+
+import static android.Manifest.permission.ACCESS_FINE_LOCATION;
+import static java.util.logging.Level.WARNING;
+import static java.util.logging.Logger.getLogger;
+import static org.briarproject.bramble.util.LogUtils.logException;
+
+class BluetoothConnecter {
+
+	private final Logger LOG = getLogger(BluetoothConnecter.class.getName());
+
+	private final Application app;
+	private final Executor ioExecutor;
+	private final AndroidExecutor androidExecutor;
+
+	private final BluetoothAdapter bt = BluetoothAdapter.getDefaultAdapter();
+	private final Plugin bluetoothPlugin;
+
+	@Inject
+	BluetoothConnecter(Application app,
+			PluginManager pluginManager,
+			@IoExecutor Executor ioExecutor,
+			AndroidExecutor androidExecutor) {
+		this.app = app;
+		this.ioExecutor = ioExecutor;
+		this.androidExecutor = androidExecutor;
+		this.bluetoothPlugin = pluginManager.getPlugin(BluetoothConstants.ID);
+	}
+
+	static void showDialog(Context ctx,
+			ActivityResultLauncher<String> permissionRequest) {
+		new AlertDialog.Builder(ctx, R.style.BriarDialogTheme)
+				.setTitle(R.string.dialog_title_connect_via_bluetooth)
+				.setMessage(R.string.dialog_message_connect_via_bluetooth)
+				.setPositiveButton(R.string.start, (dialog, which) ->
+						permissionRequest.launch(ACCESS_FINE_LOCATION))
+				.setNegativeButton(R.string.cancel, null)
+				.show();
+	}
+
+	@UiThread
+	void onLocationPermissionResult(boolean result,
+			ActivityResultLauncher<Integer> bluetoothDiscoverableRequest) {
+		if (result) {
+			if (isBluetoothSupported()) {
+				bluetoothDiscoverableRequest.launch(120);
+			} else {
+				showToast(R.string.toast_connect_via_bluetooth_error);
+			}
+		} else {
+			// could also show the same dialog as KeyAgreementActivity
+			showToast(R.string.permission_location_denied_body);
+		}
+	}
+
+	private boolean isBluetoothSupported() {
+		return bt != null && bluetoothPlugin != null;
+	}
+
+	@UiThread
+	void onBluetoothDiscoverable(boolean result, ContactItem contact) {
+		if (result) {
+			connect(contact);
+		} else {
+			showToast(R.string.toast_connect_via_bluetooth_not_discoverable);
+		}
+	}
+
+	private void connect(ContactItem contact) {
+		// TODO
+		//  * enable bluetooth connections setting, if not enabled
+		//  * wait for plugin to become active
+		ioExecutor.execute(() -> {
+			Random r = new Random();
+			try {
+				showToast(R.string.toast_connect_via_bluetooth_start);
+				// TODO do real work here
+				Thread.sleep(r.nextInt(3000) + 3000);
+				if (r.nextBoolean()) {
+					showToast(R.string.toast_connect_via_bluetooth_success);
+				} else {
+					showToast(R.string.toast_connect_via_bluetooth_error);
+				}
+			} catch (InterruptedException e) {
+				logException(LOG, WARNING, e);
+			}
+		});
+	}
+
+	private void showToast(@StringRes int res) {
+		androidExecutor.runOnUiThread(() ->
+				Toast.makeText(app, res, Toast.LENGTH_LONG).show()
+		);
+	}
+
+}

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationActivity.java

@@ -47,6 +47,7 @@ import org.briarproject.briar.android.activity.BriarActivity;
 import org.briarproject.briar.android.attachment.AttachmentItem;
 import org.briarproject.briar.android.attachment.AttachmentRetriever;
 import org.briarproject.briar.android.blog.BlogActivity;
+import org.briarproject.briar.android.contact.ContactItem;
 import org.briarproject.briar.android.conversation.ConversationVisitor.AttachmentCache;
 import org.briarproject.briar.android.conversation.ConversationVisitor.TextCache;
 import org.briarproject.briar.android.forum.ForumActivity;
@@ -91,6 +92,8 @@ import java.util.logging.Logger;
 
 import javax.inject.Inject;
 
+import androidx.activity.result.ActivityResultLauncher;
+import androidx.activity.result.contract.ActivityResultContracts.RequestPermission;
 import androidx.annotation.Nullable;
 import androidx.annotation.UiThread;
 import androidx.appcompat.app.AlertDialog;
@@ -211,6 +214,21 @@ public class ConversationActivity extends BriarActivity
 
 	private volatile ContactId contactId;
 
+	private final ActivityResultLauncher<Integer> bluetoothDiscoverableRequest =
+			registerForActivityResult(new RequestBluetoothDiscoverable(), r -> {
+				// MenuItem only gets enabled after contactItem has loaded
+				ContactItem contact =
+						requireNonNull(viewModel.getContactItem().getValue());
+				BluetoothConnecter bc = viewModel.getBluetoothConnecter();
+				bc.onBluetoothDiscoverable(r, contact);
+			});
+	private final ActivityResultLauncher<String> permissionRequest =
+			registerForActivityResult(new RequestPermission(), result -> {
+				BluetoothConnecter bc = viewModel.getBluetoothConnecter();
+				bc.onLocationPermissionResult(result,
+						bluetoothDiscoverableRequest);
+			});
+
 	@Override
 	public void onCreate(@Nullable Bundle state) {
 		if (SDK_INT >= 21) {
@@ -370,9 +388,11 @@ public class ConversationActivity extends BriarActivity
 						this::showIntroductionOnboarding);
 			}
 		});
-		// enable alias action if available
-		observeOnce(viewModel.getContactItem(), this, contact ->
-				menu.findItem(R.id.action_set_alias).setEnabled(true));
+		// enable alias and bluetooth action once available
+		observeOnce(viewModel.getContactItem(), this, contact -> {
+			menu.findItem(R.id.action_set_alias).setEnabled(true);
+			menu.findItem(R.id.action_connect_via_bluetooth).setEnabled(true);
+		});
 		// Show auto-delete menu item if feature is enabled
 		if (featureFlags.shouldEnableDisappearingMessages()) {
 			MenuItem item = menu.findItem(R.id.action_conversation_settings);
@@ -381,40 +401,39 @@ public class ConversationActivity extends BriarActivity
 			viewModel.getPrivateMessageFormat().observe(this, format ->
 					item.setEnabled(format == TEXT_IMAGES_AUTO_DELETE));
 		}
-
 		return super.onCreateOptionsMenu(menu);
 	}
 
 	@Override
 	public boolean onOptionsItemSelected(MenuItem item) {
-		// Handle presses on the action bar items
-		switch (item.getItemId()) {
-			case android.R.id.home:
-				onBackPressed();
-				return true;
-			case R.id.action_introduction:
-				if (contactId == null) return false;
-				Intent intent = new Intent(this, IntroductionActivity.class);
-				intent.putExtra(CONTACT_ID, contactId.getInt());
-				startActivityForResult(intent, REQUEST_INTRODUCTION);
-				return true;
-			case R.id.action_set_alias:
-				AliasDialogFragment.newInstance().show(
-						getSupportFragmentManager(), AliasDialogFragment.TAG);
-				return true;
-			case R.id.action_conversation_settings:
-				if (contactId == null) return false;
-				onAutoDeleteTimerNoticeClicked();
-				return true;
-			case R.id.action_delete_all_messages:
-				askToDeleteAllMessages();
-				return true;
-			case R.id.action_social_remove_person:
-				askToRemoveContact();
-				return true;
-			default:
-				return super.onOptionsItemSelected(item);
+		// contactId gets set before in onCreate()
+		int itemId = item.getItemId();
+		if (itemId == android.R.id.home) {
+			onBackPressed();
+			return true;
+		} else if (itemId == R.id.action_introduction) {
+			Intent intent = new Intent(this, IntroductionActivity.class);
+			intent.putExtra(CONTACT_ID, contactId.getInt());
+			startActivityForResult(intent, REQUEST_INTRODUCTION);
+			return true;
+		} else if (itemId == R.id.action_set_alias) {
+			AliasDialogFragment.newInstance().show(
+					getSupportFragmentManager(), AliasDialogFragment.TAG);
+			return true;
+		} else if (itemId == R.id.action_conversation_settings) {
+			onAutoDeleteTimerNoticeClicked();
+			return true;
+		} else if (itemId == R.id.action_connect_via_bluetooth) {
+			BluetoothConnecter.showDialog(this, permissionRequest);
+			return true;
+		} else if (itemId == R.id.action_delete_all_messages) {
+			askToDeleteAllMessages();
+			return true;
+		} else if (itemId == R.id.action_social_remove_person) {
+			askToRemoveContact();
+			return true;
 		}
+		return super.onOptionsItemSelected(item);
 	}
 
 	@Override

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationViewModel.java

@@ -101,6 +101,7 @@ public class ConversationViewModel extends DbViewModel
 	private final AttachmentCreator attachmentCreator;
 	private final AutoDeleteManager autoDeleteManager;
 	private final ConversationManager conversationManager;
+	private final BluetoothConnecter bluetoothConnecter;
 
 	@Nullable
 	private ContactId contactId = null;
@@ -139,7 +140,8 @@ public class ConversationViewModel extends DbViewModel
 			AttachmentRetriever attachmentRetriever,
 			AttachmentCreator attachmentCreator,
 			AutoDeleteManager autoDeleteManager,
-			ConversationManager conversationManager) {
+			ConversationManager conversationManager,
+			BluetoothConnecter bluetoothConnecter) {
 		super(application, dbExecutor, lifecycleManager, db, androidExecutor);
 		this.db = db;
 		this.eventBus = eventBus;
@@ -152,6 +154,7 @@ public class ConversationViewModel extends DbViewModel
 		this.attachmentCreator = attachmentCreator;
 		this.autoDeleteManager = autoDeleteManager;
 		this.conversationManager = conversationManager;
+		this.bluetoothConnecter = bluetoothConnecter;
 		messagingGroupId = map(contactItem, c ->
 				messagingManager.getContactGroup(c.getContact()).getId());
 		eventBus.addListener(this);
@@ -411,6 +414,10 @@ public class ConversationViewModel extends DbViewModel
 		return attachmentRetriever;
 	}
 
+	BluetoothConnecter getBluetoothConnecter() {
+		return bluetoothConnecter;
+	}
+
 	LiveData<ContactItem> getContactItem() {
 		return contactItem;
 	}

briar-android/src/main/java/org/briarproject/briar/android/conversation/RequestBluetoothDiscoverable.java

@@ -0,0 +1,30 @@
+package org.briarproject.briar.android.conversation;
+
+import android.content.Context;
+import android.content.Intent;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+
+import androidx.activity.result.contract.ActivityResultContract;
+import androidx.annotation.Nullable;
+
+import static android.app.Activity.RESULT_CANCELED;
+import static android.bluetooth.BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE;
+import static android.bluetooth.BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION;
+
+@NotNullByDefault
+class RequestBluetoothDiscoverable
+		extends ActivityResultContract<Integer, Boolean> {
+
+	@Override
+	public Intent createIntent(Context context, Integer duration) {
+		Intent i = new Intent(ACTION_REQUEST_DISCOVERABLE);
+		i.putExtra(EXTRA_DISCOVERABLE_DURATION, duration);
+		return i;
+	}
+
+	@Override
+	public Boolean parseResult(int resultCode, @Nullable Intent intent) {
+		return resultCode != RESULT_CANCELED;
+	}
+}

briar-android/src/main/res/menu/conversation_actions.xml

@@ -23,6 +23,12 @@
 		app:showAsAction="never"
 		tools:visible="true" />
 
+	<item
+		android:id="@+id/action_connect_via_bluetooth"
+		android:enabled="false"
+		android:title="@string/menu_item_connect_via_bluetooth"
+		app:showAsAction="never" />
+
 	<item
 		android:id="@+id/action_delete_all_messages"
 		android:title="@string/delete_all_messages"

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

@@ -142,6 +142,7 @@
 	<string name="allow">Allow</string>
 	<string name="open">Open</string>
 	<string name="change">Change</string>
+	<string name="start">Start</string>
 	<string name="no_data">No data</string>
 	<string name="ellipsis">…</string>
 	<string name="text_too_long">The entered text is too long</string>
@@ -168,6 +169,13 @@
 	<string name="set_contact_alias">Change contact name</string>
 	<string name="set_contact_alias_hint">Contact name</string>
 	<string name="menu_item_disappearing_messages">Disappearing messages</string>
+	<string name="menu_item_connect_via_bluetooth">Connect via Bluetooth</string>
+	<string name="dialog_title_connect_via_bluetooth">Connect via Bluetooth</string>
+	<string name="dialog_message_connect_via_bluetooth">Your contact needs to be in close proximity for this to work. They need to press start at the same time as you and confirm the following system dialog.</string>
+	<string name="toast_connect_via_bluetooth_not_discoverable">Can not continue without Bluetooth</string>
+	<string name="toast_connect_via_bluetooth_start">Connecting via Bluetooth…</string>
+	<string name="toast_connect_via_bluetooth_success">Successfully connected via Bluetooth</string>
+	<string name="toast_connect_via_bluetooth_error">Could not connect via Bluetooth</string>
 	<!-- The first placeholder will show a duration like "7 days". The second placeholder at the end will add "Tap to learn more." -->
 	<string name="auto_delete_msg_you_enabled">Your messages will disappear after %1$s. %2$s</string>
 	<!-- The placeholder at the end will add "Tap to learn more." -->