【Android,kotlin】写倒计时CountDown的正确姿势

写倒计时CountDown的正确姿势

倒计时

​​申明​​

private var countDownHandler = Handler()
var countDownTime = Constants.RETURN_TIME//自己设定的时间
private val countDown = object : Runnable {
    override fun run() {
    if (countDownTime >= 0) {
        countDownHandler.postDelayed(this, 1000)//每秒
        //执行逻辑
        //可以动态的更新UI:还有5s返回之类的
    } else {
        //停止的逻辑
    }
    countDownTime--
    }
}

​​调用​​

viewBinding.defaultPaneDefault.defaultPaneDefaultQr.setOnClickListener {
   //点击事件逻辑
  countDownTime = Constants.RETURN_TIME
  countDownHandler.postDelayed(
    countDown, 0)
}