简单实现Android倒计时效果

/** * 显示剩余时间 */private void setRestTime(final BaseViewHolder holder, IndexPicAdModel model) {  holder.setVisible(R.id.time, false);  holder.setVisible(R.id.dayTime, false);  if (null != timer) {    timer.cancel();  }  timer = new Timer();  timeRest = Long.valueOf(model.getStartTime()) - System.currentTimeMillis();  timer.schedule(new TimerTask() {    @Override    public void run() {      timeRest = timeRest - 1000;      final long day = timeRest / (24 * 60 * 60 * 1000);      final long hour = (timeRest / (60 * 60 * 1000) - day * 24);      final long min = ((timeRest / (60 * 1000)) - day * 24 * 60 - hour * 60);      final long second = (timeRest / 1000 - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60);      liveTodayHandler.post(new Runnable() {        @Override        public void run() {          //如果大于一天          if (day >= 1) {            holder.setText(R.id.day, day + "");            holder.setText(R.id.title, "离开始还有");            holder.setVisible(R.id.time, true);            holder.setVisible(R.id.dayTime, false);          } else if (timeRest <= 0) {            if (null != timer) {              timer.cancel();            }            holder.setText(R.id.title, "火热进行中");            holder.setVisible(R.id.time, false);            holder.setVisible(R.id.dayTime, false);          } else {            holder.setText(R.id.hour, (hour >= 10 ? hour + "" : "0" + hour));            holder.setText(R.id.min, (min >= 10 ? min + "" : "0" + min));            holder.setText(R.id.second, (second >= 10 ? second + "" : "0" + second));            holder.setText(R.id.title, "离开始还有");            holder.setVisible(R.id.time, false);            holder.setVisible(R.id.dayTime, true);          }        }      });    }  }, 0, 1000);}