Question

我正在尝试添加以下行，但它给了我一个错误 FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler); 还添加了包.. 但它给出了一个错误，如

Try correcting the name to the name of an existing method, or defining a method named 'onBackgroundMessage'.```

Answer 1

你用错了，如下使用：

final FirebaseMessaging _auroMessaging = FirebaseMessaging();

//Method to register for FCM Messages
  void registerAuroNotifications() async {
    //Initialize Firebase
    await Firebase.initializeApp();

    //Prasad Get User permissions on  iOS
    getFCMIOSPermission();

    // Listen for Messages
    this.listenToFCMMessages();

    this.getFCMToken();
  }
  
  
  //Method getFCMIOSPermission
  void getFCMIOSPermission() {
    _auroMessaging.requestNotificationPermissions(const IosNotificationSettings(
        sound: true, badge: true, alert: true, provisional: true));
    _auroMessaging.onIosSettingsRegistered
        .listen((IosNotificationSettings settings) {
      print("IOS Settings registered: $settings");
    });
  }

  //Method to get FCM Token
  void getFCMToken() {
    _auroMessaging.getToken().then((token) {
      _fcmToken = token;
      sendTokenForFCMtoServer(_fcmToken);
      print('Token : $token');
    });
  }
  
  
  //Method to register and listen to FCM messages
  void listenToFCMMessages() {
    _auroMessaging.configure(
      onMessage: (Map<String, dynamic> message) async {
        print('onMessage : $message');
      },
      onLaunch: (Map<String, dynamic> message) async {
        print('onLaunch : $message');
      },
      onResume: (Map<String, dynamic> message) async {
        print('onResume : $message');
      },
      onBackgroundMessage: (Map<String, dynamic> message) async {
        print('onResume : $message');
      },
    );
  }

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