private boolean isMainActivityTop(Activity XXXActivity){

   ActivityManager manager = (ActivityManager) context.getSystemService(Activity.ACTIVITY_SERVICE);
   List<RunningTaskInfo> runningTaskInfos = manager.getRunningTasks(1);

   if (runningTaskInfos != null && !runningTaskInfos.isEmpty())
   String name = runningTaskInfos.get(0).topActivity.getClassName();

      return name.equals(XXXActivity.class.getName());