倒计时代码

new CountDownTimer(30000, 1000) {

            @Override
            public void onTick(long millisUntilFinished) {
                // TODO Auto-generated method stub

                // System.out.println(millisUntilFinished / 1000 % 60 + "秒");
                // System.out.println(millisUntilFinished / 1000 / 60 % 60 +
                // "分");
                // System.out.println(millisUntilFinished / 1000 / 60 / 60 +
                // "小时"
                // + millisUntilFinished / 1000 / 60 % 60 + "分"
                // + millisUntilFinished / 1000 % 60 + "秒");

                String hours = millisUntilFinished / 1000 / 60 / 60 + "小时";
                String min = millisUntilFinished / 1000 / 60 % 60 + "分";
                String sec = millisUntilFinished / 1000 % 60 + "秒";

                tv.setText(hours + min + sec);
            }

            @Override
            public void onFinish() {
                // TODO Auto-generated method stub
                tv.setText("finishi");
            }
        }.start();