当应用程序处于后台时，Flutter Cloud Messaging 自定义通知声音不起作用

Posted 2023-04-18

【中文标题】当应用程序处于后台时，Flutter Cloud Messaging 自定义通知声音不起作用

【英文标题】：Flutter Cloud Messaging custom notification sound not working when the app is in background

【发布时间】：2021-10-22 05:17:05

【问题描述】：

我的 Flutter 应用程序有一个自定义通知音，当应用程序处于前台时可以正常工作。但是当我关闭应用程序或将其保留在后台时，通知即将到来，但没有自定义通知声音。颤振版本 2.0，颤振本地通知：^5.0.0 firebase_messaging：^10.0.4。这是我的代码。任何人都可以帮我解决这个错误吗？谢谢你

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

    androidNotificationChannel channel;
    FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin;
    void main() async 
      WidgetsFlutterBinding.ensureInitialized();
      await Firebase.initializeApp();
      FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);
      if (!kIsWeb) 
        channel = const AndroidNotificationChannel(
          'high_importance_channel',
          'High Importance Notifications',
          'This channel is used for important notifications.',
          importance: Importance.high,
          enableLights: true,
          sound: RawResourceAndroidNotificationSound('notification'),
          playSound: true,
          enableVibration: true,
        );
        flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();
        await flutterLocalNotificationsPlugin
            .resolvePlatformSpecificImplementation<
                AndroidFlutterLocalNotificationsPlugin>()
            ?.createNotificationChannel(channel);
        await FirebaseMessaging.instance
            .setForegroundNotificationPresentationOptions(
          alert: true,
          badge: true,
          sound: true,
        );
      
      runApp(new MaterialApp(
        home: MyApp(),
        debugShowCheckedModeBanner: false,
        routes: <String, WidgetBuilder>,
      ));
    


     initializeFCM() async 
    FirebaseMessaging.onMessageOpenedApp.listen((message) 
      print('Message clicked!');
    );
    messaging = FirebaseMessaging.instance;

    messaging.subscribeToTopic("messaging");
    messaging.getToken().then((value) async 
     
      print("FirebaseToken:" + value);
      var token = await getSharedPrefrence('token');
      var notiToken = await sharedPrefrence('notiToken', value.toString());
      if (token != null) 
        var sendToken = await sendNotiTokenApi(value.toString());
      
     
      print(notiToken);
    );
    final sound = "notification.mp3";
    FirebaseMessaging.onMessage.listen(
      (RemoteMessage message) 
        RemoteNotification notification = message.notification;
        AndroidNotification android = message.notification?.android;
        if (notification != null && android != null && !kIsWeb) 
          flutterLocalNotificationsPlugin.show(
              notification.hashCode,
              notification.title,
              notification.body,
              NotificationDetails(
                android: AndroidNotificationDetails(
                  channel.id,
                  channel.name,
                  channel.description,
                  icon: 'launch_background',
                  importance: Importance.max,
                  priority: Priority.max,
                  enableLights: true,
                  enableVibration: true,
                  playSound: true,
                  sound: RawResourceAndroidNotificationSound('notification'),
                ),
              ));
        

        showDialog(
            context: context,
            builder: (BuildContext context) 
              return AlertDialog(
                title: Text("Notification"),
                content: Text(message.notification.body),
                actions: [
                  TextButton(
                    child: Text("Ok"),
                    onPressed: () 
                      Navigator.of(context).pop();
                    ,
                  )
                ],
              );
            );
      ,
    );
  

  void showNotification(message) async 
    var androidPlatformChannelSpecifics = new AndroidNotificationDetails(
      Platform.isAndroid
          ? 'com.dfa.flutterchatdemo'
          : 'com.duytq.flutterchatdemo',
      'Flutter chat demo',
      'your channel description',
      playSound: true,
      enableVibration: true,
      sound: RawResourceAndroidNotificationSound('notification'),
      importance: Importance.max,
      enableLights: true,
      priority: Priority.high,
    );
    var iosPlatformChannelSpecifics = new IOSNotificationDetails();
    var platformChannelSpecifics = new NotificationDetails(
        android: androidPlatformChannelSpecifics,
        iOS: iOSPlatformChannelSpecifics);

   
    print(
      message['notification']['title'].toString(),
    );
  
    

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

  void configLocalNotification() 
    var initializationSettingsAndroid =
        new AndroidInitializationSettings('@mipmap/ic_launcher');
    var initializationSettingsIOS = new IOSInitializationSettings();
    var initializationSettings = new InitializationSettings(
        iOS: initializationSettingsIOS, android: initializationSettingsAndroid);
    flutterLocalNotificationsPlugin.initialize(initializationSettings,
        onSelectNotification: onSelectNotification);
  

【参考方案1】：

对于 onMessage，您使用 flutterLocalNotificationsPlugin.show 手动推送自定义通知，但对于 _firebaseMessagingBackgroundHandler，使用默认通知推送器。 p>

修复： 您可以尝试初始化所需的对象并像当前的 flutterLocalNotificationsPlugin.show

一样对其进行自定义

【讨论】：

当我复制 flutterLocaNotificationsPlugin.show 时，我收到以下错误消息：FlutterFire 消息：后台消息处理程序中发生错误：NoSuchMethodError：getter 'id' 被调用为 null。