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

Posted 2023-02-23

【中文标题】Firebase 消息传递 - 当应用程序关闭或在 Flutter 中休眠时不会发送通知

【英文标题】：Firebase messaging - Notifications are not sent when app is Closed or sleep in Flutter

【发布时间】：2021-06-07 06:26:22

【问题描述】：

我已经在 Flutter 中构建了我的应用，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 目前由于与依赖项发生冲突，我没有升级。 通过这种方式，当应用程序打开时我会收到两个通知，我会正确收到本地通知，当应用程序处于前台和后台时，我会根据添加到我的 firestore 中的新集合获得 Firebasemessaging。 现在问题来了，当我关闭应用程序或几分钟后开始睡眠时应用程序...... 我收不到任何通知

要重新开始接收通知，我需要再次运行该应用并唤醒该应用。 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，用户需要随时获取它们。

【参考方案1】：

正如您在FlutterFire documentation 上所做的那样，插件处理前台和后台通知的方式不同，因此您需要在您的应用中修复两件事。

首先你需要准备你的云函数来发送后台通知以及前台，为此，你需要准备你的json不仅有一个notification还有一个data字段，如如下：

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

其次，您需要配置您的 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，您可以执行以下操作：

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

【讨论】：

你认为有必要做广告吗：Future myBackgroundMessageHandler(RemoteMessage message) async print("处理后台消息：$message");等待 Firebase.initializeApp(); //这条线??

如果应用程序已经初始化，我认为是这样。

太好了，你救了我的应用程序和我的生命！

很高兴能帮上忙 :)

请阅读我所做的评论，因为我遇到了应用程序崩溃和错误：

【参考方案2】：

添加线：

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

我收到以下错误：

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.access$1600(ActivityThread.java:224)
 at android.app.ActivityThread$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

【讨论】：

尝试在这个community answer上做建议

This 也可以工作，导入 io.flutter.plugin.common.PluginRegistry.PluginRegistrantCallback; 并将此代码添加到您的 onCreate - FlutterFirebaseMessagingService.setPluginRegistrant(this);