private Handler handler = new Handler();
 Runnable runnable = new Runnable() {
            public void run() {
                time.setText(String.format("%d:%d",
                        TimeUnit.MILLISECONDS.toMinutes(AppController.RunningTime),
                        TimeUnit.MILLISECONDS.toSeconds(AppController.RunningTime) -
                                TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(AppController.RunningTime))));
                AppController.RunningTime = AppController.RunningTime - 10000;
                if (AppController.RunningTime <= 0) {
                    // inform user about your time is finished.
                    handler.removeCallbacks(runnable);
                    openTimeUpDailog(mContext);
                }
                handler.postDelayed(this, 1000);
            }
        };
        runnable.run();

if (AppController.RunningTime <= 0) {

    handler.removeCallbacks(runnable);
     openTimeUpDailog(mContext);
    else{
    handler.postDelayed(this, 1000);}