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我正在尝试使用https://pub.dev/packages/firebase_messaging (firebase_messaging: ^11.1.0) 在我的 Flutter 应用程序中接收来自 Rest Api 的推送通知，但我只能通过 FCM 接收来自 firebase 控制台的通知。我无法从其他 API 收到任何通知。我附上了我的 main.dart

main.dart

Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
  await Firebase.initializeApp();
  print('Handling a background message ${message.messageId}');
}

late AndroidNotificationChannel channel;
late FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin;

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);

  if (!kIsWeb) {
    channel = const AndroidNotificationChannel(
      'high_importance_channel', // id
      'High Importance Notifications', // title
      //'This channel is used for important notifications.', // description
      importance: Importance.high,
    );
    flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();
    await flutterLocalNotificationsPlugin
        .resolvePlatformSpecificImplementation<
        AndroidFlutterLocalNotificationsPlugin>()
        ?.createNotificationChannel(channel);
    await FirebaseMessaging.instance
        .setForegroundNotificationPresentationOptions(
      alert: true,
      badge: true,
      sound: true,
    );
  }
  runApp(MyApp());
}

class MyApp extends StatefulWidget{
  _MyAppState createState()=>_MyAppState();
}

class _MyAppState extends State<MyApp> {
 
  @override
  void initState() async{
    super.initState();
    RemoteMessage? initialMessage = await FirebaseMessaging.instance.getInitialMessage();
    if (initialMessage != null) {
      _handleMessage(initialMessage);
      print("message not null");
    }
    FirebaseMessaging.onMessageOpenedApp.listen(_handleMessage);

    FirebaseMessaging.onMessage.listen((RemoteMessage message) {
      RemoteNotification? notification = message.notification;
      AndroidNotification? android = message.notification?.android;
      if (notification != null && android != null) {
        flutterLocalNotificationsPlugin.show(
            notification.hashCode,
            notification.title,
            notification.body,
            NotificationDetails(
              android: AndroidNotificationDetails(
                channel.id,
                channel.name,
                //channel.description,
                icon: android.smallIcon,
                // other properties...
              ),
            ));
      }
    });
    FirebaseMessaging.onMessageOpenedApp.listen((RemoteMessage message) {
      print('A new onMessageOpenedApp event was published!');
      // Navigator.pushNamed(context, '/message',
      //     arguments: MessageArguments(message, true));
    });
 }

  @override
  Widget build(BuildContext context) {
    .....
  }
}

AndroidManifest.xml

 <meta-data
           android:name="com.google.firebase.messaging.default_notification_channel_id"
           android:value="high_importance_channel" />
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