android onTouchEvent不起作用

Question

我想在调用sendScroll（）方法时滚动页面。滚动工作正常，我想在屏幕上触摸时停止滚动。在下面的代码中，on touchevent无效。

private void sendScroll(){
    final Handler timerHandler = new Handler();
    final Runnable timerRunnable = new Runnable() {
        @Override
        public void run() {
            scrollView.smoothScrollBy(0,5);         // 5 is how many pixels you want it to scroll vertically by
            timerHandler.postDelayed(this, 10);     // 10 is how many milliseconds you want this thread to run

        }


        public boolean onTouchEvent(MotionEvent event) {
            // MotionEvent object holds X-Y values
            if(event.getAction() == MotionEvent.ACTION_DOWN) {
                //String text = "You click at x = " + event.getX() + " and y = " + event.getY();
                //Toast.makeText(this, text, Toast.LENGTH_LONG).show();

                timerHandler.removeCallbacks(timerRunnable); //stop
            }

            return super.onTouchEvent(event);
        }

    };
    timerHandler.postDelayed(timerRunnable, 0);//start


}

它显示了timerRunnable和onTouchEvent（event）的错误。