Flutter Firebase Cloud Messaging 如何自动关闭/取消通知？

Question

我已经成功地通过控制台以及从我的 NodeJs 服务器接收 FCM 消息（在我的手机上）。但是我如何发送和接收将到达我的手机的 FCM 消息，执行一些任务，然后自行自动取消/关闭？

这在 Flutter with FCM 中是否可行？ 在Android中，我们曾经有public Notification.Builder setTimeoutAfter (long durationMs)

更多的是用于 ping 客户端应用程序...并从应用程序本地存储中检索一些数据。因为它可以自动完成，所以我想这样做而不会给用户带来麻烦。

Answer 1

这些是完成以下步骤的步骤

• 在不打扰用户的情况下接收通知（在系统托盘中没有任何警报的静默方式）
• 让 localNotification Pkg 启动进度通知
• 执行后台任务并完成后
• 通过 LocalNotifications Pkg 取消通知

确保您的 .yaml 文件中包含以下内容...在解决此问题时，我有以下版本：

  firebase_messaging: ^11.1.0
  firebase_core: ^1.10.0
  flutter_local_notifications: ^9.1.

对于本地通知包，让我们创建一个类来使用它的服务

import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';

class LocalNotificationService {
  static final FlutterLocalNotificationsPlugin _notificationsPlugin = FlutterLocalNotificationsPlugin();

  static void initialize(BuildContext context) {
    final InitializationSettings initializationSettings = InitializationSettings(
        android: const AndroidInitializationSettings("@mipmap/your_icon"));

    _notificationsPlugin.initialize(initializationSettings);
  }


//=================================================
//==============this is the update notification

  static Future<void> showProgressNotification() async {
    const int maxProgress = 5;
    for (int i = 0; i <= maxProgress; i++) {
      await Future<void>.delayed(const Duration(seconds: 1), () async {
        final AndroidNotificationDetails androidPlatformChannelSpecifics =
        AndroidNotificationDetails('progress channel', 'progress channel',
            channelDescription: 'progress channel description',
            channelShowBadge: false,
            importance: Importance.max,
            priority: Priority.high,
            playSound: false,
            showProgress: true,
            maxProgress: maxProgress,
            progress: i);
        final NotificationDetails platformChannelSpecifics =
        NotificationDetails(android: androidPlatformChannelSpecifics);
        await _notificationsPlugin.show(
            0,//I use this id to cancel it from below method
            'progress notification title',
            'progress notification body',
            platformChannelSpecifics,
            payload: 'item x');
      });
    }
  }

  //=========================and this is for the ProgressNotification to be cancelled
  static Future<void> cancelNotification() async {
    await _notificationsPlugin.cancel(0);
  }

}//end of class

让你在你的Widget的init方法中初始化它

@override
  void initState()  {
    // TODO: implement initState
    super.initState();

    LocalNotificationService.initialize(context);
}

最后...这是您的 Main() 和顶级处理程序的外观

//Receive message when app is in background/minimized 
//THIS IS THE TOP LEVEL HANDLER.. as it is outside the scope of main()
Future<void> backgroundHandler(RemoteMessage message) async{
  print("from the Background Handler Top Function()..............");
  print(message.data.toString()); 
  //now for the localNotification to take over
  await LocalNotificationService.showProgressNotification();
  await Future<void>.delayed(const Duration(seconds: 2));//faking task delay
  await LocalNotificationService.cancelNotification();//by default I have made id=0
}



void main() async{
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  FirebaseMessaging.onBackgroundMessage(backgroundHandler);//this has to be a TOP LEVEL METHOD
  runApp(MyApp());
}

在服务器端发送通知时确保只有数据{}...见@Junsu Cho 回答

Answer 2

ios 是不可能的 android 是可能的，删除通知负载

{
"to": "bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1..."
"notification":
    {
        "title": "title"
    }
"data":
    {
      "data" : "data"
    }
}

到

{
"to": "bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1..."
"data":
    {
      "data" : "data"
    }
}