Firebase 消息传递 - 当应用程序关闭或在 Flutter 中休眠时不发送通知

Question

我已经在 flutter 中构建了我的应用程序，并且我已经实现了 LocalNotifications 和 FCM 消息传递。

这是我的代码：

 final FirebaseMessaging firebaseMessaging = FirebaseMessaging();
  final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
  FlutterLocalNotificationsPlugin();


  
  @override
  void initState() {
    super.initState();
    registerNotification();
    configLocalNotification();

  }



  void registerNotification() {
    firebaseMessaging.requestNotificationPermissions();

    firebaseMessaging.configure(onMessage: (Map<String, dynamic> message) {
      print('onMessage: $message');
      return ;
    }, onResume: (Map<String, dynamic> message) {
      print('onResume: $message');
      return Navigator.push(
          context,
          MaterialPageRoute(
              builder: (context) => NotificationsScreen()));
    },
        onLaunch: (Map<String, dynamic> message) {
      print('onLaunch: $message');
      return;
    });

    firebaseMessaging.getToken().then((token) {
      print('token: $token');
      FirebaseFirestore.instance
          .collection('Consultant')
          .doc(firebaseUser.uid)
          .update({'deviceToken': token});
    }).catchError((err) {
      //Fluttertoast.showToast(msg: err.message.toString());
    });
  }

  Future selectNotification(String payload) async {
    if (payload != null) {
      debugPrint('notification payload: $payload');
    }
    await Navigator.push(
      context,
      MaterialPageRoute<void>(builder: (context) => NotificationsScreen(payload: payload,)),
    );
  }

  void showNotification(message) async {
    var androidPlatformChannelSpecifics = new AndroidNotificationDetails(
      Platform.isAndroid
          ? 'it.wytex.vibeland_pro_app'
          : 'it.wytex.vibeland_pro_app',
      'Vibeland Pro',
      'Vibeland Pro',
      playSound: true,
      enableVibration: true,
      importance: Importance.max,
      priority: Priority.high,
    );
    var iOSPlatformChannelSpecifics = new IOSNotificationDetails();
    var platformChannelSpecifics = new NotificationDetails(
        android: androidPlatformChannelSpecifics, iOS: iOSPlatformChannelSpecifics);

    print(message);
    print(message['body'].toString());
    print(json.encode(message));

    await flutterLocalNotificationsPlugin.show(0, message['title'].toString(),
        message['body'].toString(), platformChannelSpecifics,
        payload: json.encode(message));

    await flutterLocalNotificationsPlugin.show(
      1, ' Hai ricevuto un messaggio  ', 'Controlla subito le Tue notifiche ', platformChannelSpecifics,
      payload: 'item x',
    );
  }

  void configLocalNotification() {
    var initializationSettingsAndroid =
    new AndroidInitializationSettings('@mipmap/ic_launcher');
    var initializationSettingsIOS = new IOSInitializationSettings(
      requestAlertPermission: true,
      requestBadgePermission: true,
      requestSoundPermission: true,
    );
    var initializationSettings = new InitializationSettings(
        android: initializationSettingsAndroid, iOS: initializationSettingsIOS);
    flutterLocalNotificationsPlugin.initialize(initializationSettings);
  }

我在 firebase 中构建了一个函数来推送一些新集合作为通知。

const functions = require("firebase-functions");
const admin = require("firebase-admin");

admin.initializeApp(functions.config().firebase);

const fcm = admin.messaging();

exports.sendNotification = functions.firestore
    .document("Notifications/{id}")
    .onCreate((snapshot) => {
      const name = snapshot.get("name");
      const subject = snapshot.get("subject");
      const token = snapshot.get("token");

      const payload = {
        notification: {
          title: "" + name,
          body: "" + subject,
          sound: "default",
          click_action: "FLUTTER_NOTIFICATION_CLICK",
        },
      };

      return fcm.sendToDevice(token, payload);
    });

firebase_messaging: ^7.0.3 和 flutter_local_notifications: ^4.0.1 的版本目前，由于与依赖项存在一些冲突，我没有升级。通过这种方式，当应用程序打开时我收到了两个通知，我正确地收到了本地通知，当应用程序处于前台和后台时，我根据添加到我的 firestore 中的新集合获得了 Firebasemessaging。现在，当我关闭应用程序或几分钟后应用程序开始休眠时，问题就来了…… 我收不到任何通知

要重新开始接收通知，我需要再次运行应用程序并唤醒应用程序。这是我的应用程序的问题，因为我的应用程序通知非常重要，用户需要始终获取它们。

Answer 1

正如您在 FlutterFire documentation 上所做的那样，插件对前台和后台通知的处理方式不同，因此您需要在应用中修复两件事。

首先，您需要准备好您的 Cloud Function 来发送后台通知和前台通知，为此，您需要准备好您的 json，不仅要有 notification，还要有还有一个data字段，如下：

const payload = {
    notification: {
      title: "" + name,
      body: "" + subject,
      sound: "default",
    },  
    data: {
        click_action: "FLUTTER_NOTIFICATION_CLICK"
    }
};

其次，您将需要配置您的 firebaseMassaging 以接收后台消息，如下所示：

firebaseMessaging.configure(
    onMessage: (Map<String, dynamic> message) {
        print('onMessage: $message');
        return ;
    }, 
    onResume: (Map<String, dynamic> message) {
        print('onResume: $message');
        return Navigator.push(
            context,
            MaterialPageRoute(
            builder: (context) => NotificationsScreen()));
    },
    onLaunch: (Map<String, dynamic> message) {
        print('onLaunch: $message');
        return;
    },
    onBackgroundMessage: myBackgroundMessageHandler
);

最后，您需要创建一个手动处理后台消息的处理程序，按照文档中的示例，您可以执行如下操作：

Future<void> myBackgroundMessageHandler(RemoteMessage message) async {        
    print("Handling a background message: ${message}");
}

Answer 2

添加行：

onBackgroundMessage: myBackgroundMessageHandler
Future<void> myBackgroundMessageHandler(RemoteMessage message) async {        
    print("Handling a background message: ${message}");
}

我遇到了这些错误：

Nexus, [10.03.21 16:59]
[ File : app-release.apk ]

Amore, [10.03.21 17:09]
java.lang.RuntimeException: Unable to create service io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService: java.lang.RuntimeException: PluginRegistrantCallback is not set.
 at android.app.ActivityThread.handleCreateService(ActivityThread.java:4023)
 at android.app.ActivityThread.access00(ActivityThread.java:224)
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1903)
 at android.os.Handler.dispatchMessage(Handler.java:107)
 at android.os.Looper.loop(Looper.java:224)
 at android.app.ActivityThread.main(ActivityThread.java:7562)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
Caused by: java.lang.RuntimeException: PluginRegistrantCallback is not set.
 at io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService.C(Unknown Source:70)
 at io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService.onCreate(Unknown Source:40)
 at android.app.ActivityThread.handleCreateService(ActivityThread.java:4011)
 ... 8 more

Firebase 消息传递 - 当应用程序关闭或在 Flutter 中休眠时不发送通知

Firebase messaging - Notifications are not sent when app is Closed or sleep in Flutter

firebase

flutter

firebase-cloud-messaging

google-cloud-firestore