Kotlin中的Kotlin函数

Question

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嘿，我一直在尝试在我的android按钮计数器应用程序中添加减少功能。在我的应用程序中有三个按钮(清除、增加、减少)。增加用于增加计数器，减少用于减少计数器，清除用于清除文本视图。我是新来的android。因此，请帮助我用kotlin编写代码

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    button?.setOnClickListener(object :View.OnClickListener {
        override fun onClick(v: View?) {
            numTimeClicked += 1
            textview?.append("\n The button got tapped $numTimeClicked time")
            if (numTimeClicked != 1){
                textview?.append("s")
            }
        }
    })
    clear?.setOnClickListener(object :View.OnClickListener{
        override fun onClick(v: View?) {
            if (numTimeClicked <= 100){
                textview?.text = ""
            }

        }
    })
    Decrease?.setOnClickListener(object :View.OnClickListener{
        override fun onClick(v: View){

            if (numTimeClicked >= 1  ){
             numTimeClicked -= 1
                textview?.append(numTimeClicked.toString())


            }
        }

    })

    }
private var userInput:EditText? = null
private  var button:Button? = null
private var textview:TextView?  = null
private var  clear:Button? = null
private var  Decrease:Button? = null
private var numTimeClicked = 0
}

Answer 1

fun decreasenumber(var numTimeClicked : Int )：Int{

numTimeClicked--

返回numTimeClicked

}

Answer 2

只需替换此行

textview?.append(numTimeClicked.toString())

至

textview?.text = "" + numTimeClicked

append的行为是这样的:3 -> 32 -> 321，我认为你的目的是替换而不是追加