Question

我可以通过使用cancel（）（timer.cancel（））函数成功停止计时器。但是如何恢复呢？我搜索了很多代码，但所有内容都是Java。我在科特林需要它。你能给我建议吗？我使用代码：

val timer = object : CountDownTimer(60000, 1000) {
        override fun onTick(millisUntilFinished: Long) {
            textView3.text = (millisUntilFinished / 1000).toString() + ""
            println("Timer  : " + millisUntilFinished / 1000)
        }

        override fun onFinish() {}
    }

编辑：

在课堂上：

var currentMillis: Long = 0 // <-- keep millisUntilFinished

    // First creation of your timer
    var timer = object : CountDownTimer(60000, 1000) {
        override fun onTick(millisUntilFinished: Long) {

            currentMillis = millisUntilFinished // <-- save value

            textView3.text = (millisUntilFinished / 1000).toString() + ""
            println("Timer  : " + millisUntilFinished / 1000)
        }

        override fun onFinish() {}
    }

在onCreate（）中：

  timer.start()

            TextView2.setOnClickListener {
                //Handle click
                timer.cancel()

            }

            TextView3.setOnClickListener {
                //Handle click
                timer = object : CountDownTimer(currentMillis, 1000) {
                    override fun onTick(millisUntilFinished: Long) {
                        currentMillis = millisUntilFinished
                        textView3.text = (millisUntilFinished / 1000).toString() + ""
                        println("Timer  : " + millisUntilFinished / 1000)
                    }

                    override fun onFinish() {}
                }
            timer.start()
}

Answer 1

我的建议：保留millisUntilFinished值并将其用于重新创建CountDownTimer


var currentMillis: Long // <-- keep millisUntilFinished

// First creation of your timer
var timer = object : CountDownTimer(60000, 1000) {
   override fun onTick(millisUntilFinished: Long) {

     currentMillis = millisUntilFinished // <-- save value

     textView3.text = (millisUntilFinished / 1000).toString() + ""
     println("Timer  : " + millisUntilFinished / 1000)
   }

   override fun onFinish() {}
   }
}

...

// You start it
timer.start()

...

// For some reasons in your app you pause (really cancel) it
timer.cancel()

...

// And for reasuming
timer = object : CountDownTimer(currentMillis, 1000) {
   override fun onTick(millisUntilFinished: Long) {
     currentMillis = millisUntilFinished
     textView3.text = (millisUntilFinished / 1000).toString() + ""
     println("Timer  : " + millisUntilFinished / 1000)
   }

   override fun onFinish() {}
   }
}

Answer 2

已经一年多了我刚开始学习 Kotlin 我可以成功暂停和恢复功能，但调用 onFinish 函数有很大的延迟我不是重新创建计时器对象，单击按钮时我调用 timer.cancel() 并将标志设置为 true 再次单击按钮时，我检查标志的值，如果为真，我调用 timer.start() 并将标志设置为 false

如何恢复CountDownTimer？

2 个答案: