Flutter Firebase 消息传递停用可见通知

Question

如何停用 Firebase Messaging 中的可见通知并使用 flutter_local_notifications 包手动处理通知，以免通知显示两次？我无法编辑服务器集成端，因为我使用的是 wordpress 插件 (https://wordpress.org/plugins/fcm-push-notification-from-wp/) 为我发送通知请求。

有效载荷如下所示：https://ps.w.org/fcm-push-notification-from-wp/assets/screenshot-6.png?rev=2446404

String selectedNotificationPayload = "";
final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
    FlutterLocalNotificationsPlugin();
final BehaviorSubject<String> selectNotificationSubject =
    BehaviorSubject<String>();
FirebaseMessaging messaging;

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();

  FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
      FlutterLocalNotificationsPlugin();

  const AndroidInitializationSettings initializationSettingsAndroid =
      AndroidInitializationSettings('share_icon');

  final IOSInitializationSettings initializationSettingsIOS =
      IOSInitializationSettings(
          requestSoundPermission: false,
          requestBadgePermission: false,
          requestAlertPermission: false,
          onDidReceiveLocalNotification:
              (int id, String title, String body, String payload) async {});

  final InitializationSettings initializationSettings = InitializationSettings(
    android: initializationSettingsAndroid,
    iOS: initializationSettingsIOS,
  );

  NotificationAppLaunchDetails notificationAppLaunchDetails =
      await flutterLocalNotificationsPlugin.getNotificationAppLaunchDetails();
  if (notificationAppLaunchDetails?.didNotificationLaunchApp ?? false) {
    selectedNotificationPayload = notificationAppLaunchDetails.payload;
  }

  await flutterLocalNotificationsPlugin.initialize(initializationSettings,
      onSelectNotification: (String payload) async {
    if (payload != null) {
      selectedNotificationPayload = payload;
      selectNotificationSubject.add(payload);
    }
  });

  FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);

  runApp(Start());
}

class Start extends StatefulWidget {
  @override
  _StartState createState() => _StartState();
}

class _StartState extends State<Start>{
  void initializeFlutterFire() async {
    try {
      await Firebase.initializeApp();
      print("Firebase - initialzed successfully");
    } catch (e) {
      print("Firebase - initialzed FAILED");
    }
    messaging = FirebaseMessaging.instance;
  }

  void _configureSelectNotificationSubject() async {
    selectNotificationSubject.stream.listen((String _url) async {
      try {
        await Future.delayed(Duration(milliseconds: 500), () async {
          await Navigator.of(context).push(new Route(_url, ""));
        });
      } catch (e) {
        print("Fehler beim öffnen der Website");
      }
    });
  }

  @override
  initState() {
    super.initState();

    initializeFlutterFire();
  }

...

}

Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
  await Firebase.initializeApp();

  Map<String, dynamic> data = message.data;

  String _title = data['title'];
  String _description = data['message'];

  sendNotification(_title, _description);
}