Android倒计时的开始与停止 剩余时分秒的展示

Handler handler = new Handler();
 Runnable update_thread = new Runnable() {
  @Override
  public void run() {
   leftTime--;
   LogUtil.e("leftTime="+leftTime);
   if (leftTime > 0) {
    //倒计时效果展示
    String formatLongToTimeStr = formatLongToTimeStr(leftTime);
    sureBtn.setText(formatLongToTimeStr);
    //每一秒执行一次
    handler.postDelayed(this, 1000);
   } else {//倒计时结束
    //处理业务流程

    //发送消息，结束倒计时
    Message message = new Message();
    message.what = 1;
    handlerStop.sendMessage(message);
   }
  }
 };

final Handler handlerStop = new Handler() {
  public void handleMessage(Message msg) {
   switch (msg.what) {
    case 1:
     leftTime = 0;
     handler.removeCallbacks(update_thread);
     break;
   }
   super.handleMessage(msg);
  }

 };

@Override
 protected void onDestroy() {
  super.onDestroy();
  leftTime = 0;
  handler.removeCallbacks(update_thread);
 }

handler.postDelayed(update_thread, 1000);

public String formatLongToTimeStr(Long l) {
  int hour = 0;
  int minute = 0;
  int second = 0;
  second = l.intValue() ;
  if (second > 60) {
   minute = second / 60; //取整
   second = second % 60; //取余
  }
  if (minute > 60) {
   hour = minute / 60;
   minute = minute % 60;
  }
  String strtime = "剩余："+hour+"小时"+minute+"分"+second+"秒";
  return strtime;
 }

public String formatLongToTimeStr(Long date) {
  long day = date / (60 * 60 * 24);
  long hour = (date / (60 * 60) - day * 24);
  long min = ((date / 60) - day * 24 * 60 - hour * 60);
  long s = (date - day*24*60*60 - hour*60*60 - min*60);
  String strtime = "剩余："+day+"天"+hour+"小时"+min+"分"+s+"秒";
  return strtime;
 }