android -- 商城秒杀倒计时的实现

我们经常会看到一些商城类App里面总会有秒杀倒计时,下面就来说一下。

        //相差多少时间 - ms
        private long dt = 0;
        private Handler handler = new Handler(){
            @Override
            public void handleMessage(Message msg) {
                super.handleMessage(msg);
                dt = dt-1000;

                SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss");
                String time = format.format(new Date(dt));

                //设置倒计时
                tv_time_seckill.setText(time);
                handler.removeMessages(0);
                handler.sendEmptyMessageDelayed(0,1000);
                if(dt <= 0){
                    handler.removeCallbacksAndMessages(null);
                }
            }
        };

            //计算秒杀倒计时---ms
            dt = Integer.valueOf(seckill_info.getEnd_time())-Integer.valueOf(seckill_info.getStart_time());

            handler.sendEmptyMessageDelayed(0,1000);