private CountDownTimer timer = new CountDownTimer(30000, 1000) { 
    //根據(jù)間隔時(shí)間來不斷回調(diào)此方法，這里是每隔1000ms調(diào)用一次
    @Override 
    public void onTick(long millisUntilFinished) { 
      //todo millisUntilFinished為剩余時(shí)間，也就是30000 - n*1000
    } 
    
    //結(jié)束倒計(jì)時(shí)調(diào)用  
    @Override 
    public void onFinish() { 
      //todo
    } 
}; 

//開始倒計(jì)時(shí)
timer.start();

//取消倒計(jì)時(shí)（譯者：取消后，再次啟動會重新開始倒計(jì)時(shí)）
timer.cancel();;

class CountDownAdapter(private var activity: ListActivity, private var data: ArrayList<Date>, private var systemDate: Date) : BaseAdapter() {

  private val timeMap = HashMap<TextView, MyCountDownTimer>()
  private val handler = Handler()
  private val runnable = object : Runnable {
    override fun run() {
      if (systemDate != null) {
        systemDate.time = systemDate.time + 1000
        Log.i("xujf", "服務(wù)器時(shí)間線程===" + systemDate + "==for==" + this)
        handler.postDelayed(this, 1000)
      }
    }
  }

  init {
    handler.postDelayed(runnable, 1000)
  }

  override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {
    var v: View
    var tag: ViewHolder
    var vo = data[position]
    if (null == convertView) {
      v = activity.layoutInflater.inflate(R.layout.item_count_down, null)
      tag = ViewHolder(v)

      v.tag = tag
    } else {
      v = convertView
      tag = v.tag as ViewHolder
    }

    //獲取控件對應(yīng)的倒計(jì)時(shí)控件是否存在, 存在就取消, 解決時(shí)間重疊問題
    var tc: MyCountDownTimer? = timeMap[tag.tvTime]
    if (tc != null) {
      tc.cancel()
      tc = null
    }

    //計(jì)算時(shí)間差
    val time = getDistanceTimeLong(systemDate, vo)
    //創(chuàng)建倒計(jì)時(shí)，與控件綁定
    val cdu = MyCountDownTimer(position, time, 1000, tag.tvTime)
    cdu.start()

    //[醒目]此處需要map集合將控件和倒計(jì)時(shí)類關(guān)聯(lián)起來
    timeMap.put(tag.tvTime, cdu)

    return v
  }

  /**
   * 退出時(shí)清空所有item的計(jì)時(shí)器
   */
  fun cancelAllTimers() {
    var s: Set<MutableMap.MutableEntry<TextView, MyCountDownTimer>>? = timeMap.entries
    var it: Iterator<*>? = s!!.iterator()
    while (it!!.hasNext()) {
      try {
        val pairs = it.next() as MutableMap.MutableEntry<*, *>
        var cdt: MyCountDownTimer? = pairs.value as MyCountDownTimer
        cdt!!.cancel()
        cdt = null
      } catch (e: Exception) {
      }

    }
    it = null
    s = null
    timeMap.clear()
  }

  fun removeTimer(){
    handler?.removeCallbacks(runnable)
  }

  fun reSetTimer(date: Date) {
    removeTimer()
    systemDate = date
    handler.postDelayed(runnable, 1000)
  }

  override fun getItem(position: Int): Any = data[position]

  override fun getItemId(position: Int): Long = 0L

  override fun getCount(): Int = data.size

  internal inner class ViewHolder(view: View) {
    var tvTime = view.findViewById<TextView>(R.id.tv_time)
  }

  /**
   * 倒計(jì)時(shí)類，每間隔countDownInterval時(shí)間調(diào)用一次onTick()
   * index參數(shù)可去除，在這里只是為了打印log查看倒計(jì)時(shí)是否運(yùn)行
   */
  private inner class MyCountDownTimer(internal var index: Int, millisInFuture: Long,
                     internal var countDownInterval: Long, internal var tv: TextView
  ) : CountDownTimer(millisInFuture, countDownInterval) {

    override fun onTick(millisUntilFinished: Long) {
      //millisUntilFinished為剩余時(shí)間長
      Log.i("xujf", "====倒計(jì)時(shí)還活著===第 $index 項(xiàng)item======")
      //設(shè)置時(shí)間格式
      val m = millisUntilFinished / countDownInterval
      val hour = m / (60 * 60)
      val minute = (m / 60) % 60
      val s = m % 60
      tv.text = "倒計(jì)時(shí) (${hour}小時(shí)${minute}分${s}秒)"
    }

    override fun onFinish() {
      tv.text = "倒計(jì)時(shí)結(jié)束"
      //todo 可以做一些刷新動作
    }
  }

  /**
   * 時(shí)間工具，返回間隔時(shí)間長
   */
  fun getDistanceTimeLong(one: Date, two: Date): Long {
    var diff = 0L
    try {
      val time1 = one.time
      val time2 = two.time
      if (time1 < time2) {
        diff = time2 - time1
      } else {
        diff = time1 - time2
      }
    } catch (e: Exception) {
      e.printStackTrace()
    }

    return diff
  }
}

class ListActivity : AppCompatActivity() {

  private val list: ArrayList<Date> = ArrayList()
  private var countDownAdapter: CountDownAdapter? = null

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_list)
    getDate()
    setDate()
  }

  private fun setDate() {
    if (countDownAdapter == null) {
      countDownAdapter = CountDownAdapter(this, list, Date())
      lv_count_down.adapter = countDownAdapter
      lv_count_down.onItemClickListener = AdapterView.OnItemClickListener { adapterView, view, i, l ->
        val intent = Intent(ListActivity@this, Main2Activity::class.java)
        startActivity(intent)
      }
    } else {
      //刷新數(shù)據(jù)時(shí)，重置本地服務(wù)器時(shí)間
      countDownAdapter!!.reSetTimer(Date())
      countDownAdapter!!.notifyDataSetChanged()
    }
  }

  private fun getDate() {
    for (i in 1..20) {
      var date = Date(Date().time + i * 1000 * 60 * 30)
      list.add(date)
    }

  }

  override fun onDestroy() {
    countDownAdapter?.cancelAllTimers()
    countDownAdapter?.removeTimer()
    super.onDestroy()
  }
}

countDownAdapter?.cancelAllTimers()
countDownAdapter?.removeTimer()