在Android中-当应用程序处于前台时如何防止Firebase推送通知？

Question

I have made a push notification service in firebase and sending data notifications and receiving it in onMessageReceived(RemoteMessage remoteMessage) very well,

I am well aware when to send which type of notifications and that's why I have used data notifications to get it when the app is killed.

But in my case, I do not want to send any notification when app is in Foreground mode, as onMessageReceived(RemoteMessage remoteMessage) will always get called when the app is in Foreground mode.

How to prevent this situation?

My notification format is this..

{
   "to" : "cGPhwcLbe5Y:APA91bFVAR6n9GxbDBovzd8X9nMBvKZ4Z098FzmkMGGUAuMhdps4uEof8mppUh7vrFTAsdFGzyurHa4gQ1nWgP-ncaN53ZtHziLi8YdHMEOGvtx6pA7ttCY5QhE5XKdFZ2QfX",
   "data" : {
    "message":"hi"
 }

}

Answer 1

There is 2 different type of message you can send from your server.

Where Notification message is handle by firebase itself.

Data message is custom payload, where you need to manage notification from your self.

so you need to use data key in your server script.

and just check that which app is running in top stack from this answer https://stackoverflow.com/a/27689352/942224

private boolean isAppInForground(Context context, String packageName){
  String[] activePackages;
  ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
   activePackages = getActivePackages(am);

   if (activePackages != null) {
       return activePackages[0].equals(packagName)
   }
    return false;
}



private String[] getActivePackages(ActivityManager mActivityManager) {
final Set<String> activePackages = new HashSet<>();
final List<ActivityManager.RunningAppProcessInfo> processInfos = mActivityManager.getRunningAppProcesses();
for (ActivityManager.RunningAppProcessInfo processInfo : processInfos) {
            if (processInfo.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
                activePackages.addAll(Arrays.asList(processInfo.pkgList));
            }
        }
        return activePackages.toArray(new String[activePackages.size()]);
    }

Answer 2

Notifications are delivered to your onMessageReceived callback only when your app is in the foreground. If your app is in the background or closed then a notification message is shown in the notification center. If you want to prevent that onMessageReceived is being called when your app is in the foreground. just get rid of FirebaseMessagingService from your app.

Check the docuemnt: Send your First Message to a Backgrounded App