flutter - 当应用程序处于后台时，FCM 通知会出现两次

Question

我正在使用 Firebase 消息传递来使用 FlutterLocalNotificationsPlugin 处理后台消息，但当我这样做时，我收到了两个通知。我收到 1 条通知来自 FlutterLocalNotificationsPlugin，另一条来自系统通知。我需要使用 FlutterLocalNotificationsPlugin 通知，因为我需要进行一些自定义，如何禁用系统默认通知？

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  await init();
  FirebaseMessaging.onBackgroundMessage(firebaseMessagingBackgroundHandler);
  await setupFlutterNotifications();
  runApp(const MyApp());
}

@pragma('vm:entry-point')
Future<void> firebaseMessagingBackgroundHandler(RemoteMessage message) async {
  await Firebase.initializeApp();
  await setupFlutterNotifications();
  print('Application background message: $message');
  final title = message.notification!.title;
  final body = message.notification!.body;
  await notificationService.notification(message);
}

Future<void> notification(RemoteMessage message) async {
    RemoteNotification? notification = message.notification!;
    flutterLocalNotificationsPlugin.show(
      notification.hashCode,
      notification.title,
      notification.body,
      const NotificationDetails(
        android: AndroidNotificationDetails(
          'channel id',
          'your channel name',
          channelDescription: 'your channel description',
          icon: 'launch_background',
        ),
      ),
    );
  }

我正在使用 laravel-notification-channels/fcm 作为我的 fcm 通知。我的问题的解决方案是注释掉 fcm setNotification 函数。请参考我下面的代码示例。

    public function toFcm($notifiable)
    {
        return FcmMessage::create()
            ->setData([
                'title' => json_encode($this->newMessage['title']),
                'body' => json_encode($this->newMessage['body']),
            ])
            // ->setNotification(\NotificationChannels\Fcm\Resources\Notification::create()
            //     ->setTitle($this->newMessage['title'])
            //     ->setBody($this->newMessage['body'])
            //     // ->setImage($this->newMessage['user']['image'])
            // )
            ->setAndroid(
                AndroidConfig::create()
                    ->setFcmOptions(AndroidFcmOptions::create()->setAnalyticsLabel('analytics'))
                    ->setPriority(AndroidMessagePriority::HIGH())
                    // ->setNotification(AndroidNotification::create()->setChannelId('high_importance_channel'))
            )->setApns(
                ApnsConfig::create()
                    ->setFcmOptions(ApnsFcmOptions::create()->setAnalyticsLabel('analytics_ios'))
            );
    }

Answer 1

我解决了这个问题，从后端修改代码，我正在使用 django，所以删除通知

 # Create message object
        message = messaging.Message(
            # Removed the notification  
            # notification=messaging.Notification(
            #     title=title,
            #     body=body,
            # ),
            data={
                "title": title,
                "body": body,
                "topic": topic,
                "actionButtons": action_buttons_json,  # JSON string of action buttons
            },
            token=registration_tokens,
        )

前端使用flutter本地通知示例代码 Firebase 服务

@pragma('vm:entry-point')
Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
  await Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform);
  await NotificationService().initialize();
  await NotificationService().showNotification(jsonEncode(message.data));
}

class FirebaseService {
  static Future<void> initialize() async {
    await Firebase.initializeApp(
      options: DefaultFirebaseOptions.currentPlatform,
    );
    FirebaseAnalytics.instance.setAnalyticsCollectionEnabled(true);

    final FirebaseMessaging _firebaseMessaging = FirebaseMessaging.instance;
    await _firebaseMessaging.requestPermission(
      alert: true,
      badge: true,
      sound: true,
    );
    FirebaseMessaging.instance
        .getToken()
        .then((value) => log("fcm token: $value"));

    FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);

    FirebaseMessaging.onMessage.listen((RemoteMessage message) async {
      await NotificationService().initialize();
      await NotificationService().showNotification(jsonEncode(message.data));
    });
    FirebaseMessaging.onMessageOpenedApp.listen((RemoteMessage message) async {
      await NotificationService().initialize();
      NotificationService().showNotification(jsonEncode(message.data));
    });
  }
}

本地通知示例代码 本地通知

  Future<void> showNotification(String data) async {
    Map<String, dynamic> payload = jsonDecode(data);
    List<dynamic> actionButtonsJson = payload['actionButtons'] is String
        ? jsonDecode(payload['actionButtons'])
        : payload['actionButtons'];
    AndroidNotificationDetails androidDetails = AndroidNotificationDetails(
      channel.id,
      channel.name,
      channelDescription: channel.description,
      actions: actionButtonsJson.isNotEmpty
          ? actionButtonsJson.map((actionbutton) {
              final _actionButton = ActionButton.fromJson(actionbutton);
              return AndroidNotificationAction(
                '${DateTime.now().millisecondsSinceEpoch ~/ 100}',
                _actionButton.title,
                cancelNotification: true,
                showsUserInterface: _actionButton.showsUserInterface,
              );
            }).toList()
          : [],
      enableLights: true,
      importance: Importance.defaultImportance,
      priority: Priority.defaultPriority,
    );

    NotificationDetails notificationDetails = NotificationDetails(
        android: androidDetails, iOS: DarwinNotificationDetails());

    await _flutterLocalNotificationsPlugin.show(
        DateTime.now().millisecondsSinceEpoch ~/ 1000,
        payload['title'],
        payload['body'],
        notificationDetails,
        payload: data);
  }