private boolean isActivityTop(){

    ActivityManager activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);

        List<RunningTaskInfo> info;

        info = activityManager.getRunningTasks(1);

        if(info.get(0).topActivity.getClassName().equals(MainActivity.this.getClass().getName())) {

             return true;

        } else {

             return false;

        }

    }



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