looper - java Threads - 如果我使用looper，我是否必须取消它们？

Question

我想知道是否有必要在这个线程上调用一些取消机制，或者它是否会在 countDowntimer 为空后停止？让我们看一下我创建的运行 android countdownTimer 的线程：

val myTimer :CountDownTimer? = null
 Thread {
            Looper.prepare()
            
           myTimer =  object : CountDownTimer(30000L, 1000L) {
                override fun onTick(millisUntilFinished: Long) {
                    this@MainActivity.runOnUiThread {
                        Log.v("mytag", "${Thread.currentThread().name}")
                        Log.v("mytag", "$millisUntilFinished")
                    }
                }

                override fun onFinish() {
                }

            }.start()
            Looper.loop()
        }.start()


    //later on  i will cancel the timer like this:

    myTimer.cancel
    myTimer = null

    do i need to do anything else to this thread to clean it up after that ?