android 隨手記 倒計時

class CountDownUtils extends CountDownTimer {

        public CountDownUtils(long millisInFuture, long countDownInterval) {
            super(millisInFuture, countDownInterval);

        }

        @Override
        public void onFinish() {
            Log.i("test", "結束倒計時");
            mHandler.sendEmptyMessage(4);
        }

        @Override
        public void onTick(long millisUntilFinished) {

        }
    }

CountDownUtils tmierutil;

private void mytimer() {
        tmierutil = new CountDownUtils(20000, 1000);
        tmierutil.start();
    }