当应用程序处于后台时，FCM 显示重复通知

问题描述

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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