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);
}