我在我的项目中实施了 FCM.推送通知按预期工作,收到通知时调用 onMessageReceived.当应用程序在前台时是这样.
I implemented FCM in my project. Push notification is working as expected, onMessageReceived is called when a notification is received. This is true when app is in the foreground.
但是,当应用程序在后台时,系统托盘总是在一个到达时显示重复的通知(例如,当收到通知 A 时,系统托盘显示 2 个通知 A)
However, when the app is in the background, the system tray always display a duplicate notification when one arrives (e.g. when Notification A is received, system tray display 2 Notification A)
如何解决这个问题?
添加代码
我扩展了 FirebaseMessagingService 类,并在 onMessageReceived 方法中有这个
I extended FirebaseMessagingService class and have this in the onMessageReceived method
这是项目中我使用 NotificationManager 的唯一部分.
This is the only part in the project where I used NotificationManager.
另外,我尝试在此方法上添加日志.当应用程序在前台时调用 onMessageReceived.应用在后台时不会被调用
Also, I tried to add a log on this method. onMessageReceived is called when app is in foreground. It doesn't get called when app is in background
@Override public void onMessageReceived(RemoteMessage remoteMessage) { RemoteMessage.Notification notification = remoteMessage.getNotification(); Intent intent = new Intent(this, MainActivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent, PendingIntent.FLAG_ONE_SHOT); String title = notification.getTitle(); String message = notification.getBody(); NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this) .setSmallIcon(R.mipmap.ic_launcher) .setContentTitle(title) .setContentText(message) .setAutoCancel(true) .setDefaults(Notification.DEFAULT_SOUND | Notification.DEFAULT_VIBRATE) .setContentIntent(pendingIntent); NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); notificationManager.notify(0, notificationBuilder.build()); } 推荐答案同样的问题.我修改了 AndroidManifest.xml,因为我正在像这样请求对旧 GCM 的权限...
Same problem. I modified AndroidManifest.xml because i was requesting permissions to old GCM like this...
<uses-permission android:name="mypackage.permission.C2D_MESSAGE" /> <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" /> <permission android:name="mypackage.permission.C2D_MESSAGE" android:protectionLevel="signature" />所以,从清单中删除它并卸载并重新安装应用程序,我的问题就解决了.
So, removing it from manifest and uninstalling and reinstalling the app my problem was solved.
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当应用程序处于后台时,FCM 显示重复通知
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