Android Kotlin-如何将DialogInterface.OnClickListener的默认值设置为函数参数？

这是我的函数声明：

fun MyDialog(ctx: Context, msg: String, yestext: String = "", OnYes: DialogInterface.OnClickListener): AlertDialog

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如何设置“OnYes:DialogInterface.OnClickListener”的默认值

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我试过OnYes:DialogInterface.OnClickListener=null，但不起作用。

答案由@mangkool提供

val builder = AlertDialog.Builder(this@MainActivity)

            // Set the alert dialog title
            builder.setTitle("App background color")

            // Display a message on alert dialog
            builder.setMessage("Are you want to set the app background color to RED?")

            // Set a positive button and its click listener on alert dialog
            builder.setPositiveButton("YES"){dialog, which ->
                // Do something when user press the positive button
                Toast.makeText(applicationContext,"Ok, we change the app background.",Toast.LENGTH_SHORT).show()

                // Change the app background color
                root_layout.setBackgroundColor(Color.RED)
            }


            // Display a negative button on alert dialog
            builder.setNegativeButton("No"){dialog,which ->
                Toast.makeText(applicationContext,"You are not agree.",Toast.LENGTH_SHORT).show()
            }


            // Display a neutral button on alert dialog
            builder.setNeutralButton("Cancel"){_,_ ->
                Toast.makeText(applicationContext,"You cancelled the dialog.",Toast.LENGTH_SHORT).show()
            }

            // Finally, make the alert dialog using builder
            val dialog: AlertDialog = builder.create()

            // Display the alert dialog on app interface
            dialog.show()

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OnYes:DialogInterface.OnClickListener？=null

是否要创建警报对话框？是，创建对话框是一个实用功能，该对话框应支持带有或不带有“是”按钮的对话框，因此需要为“是”按钮文本和OnClickListener提供可选参数。OnYes:DialogInterface.OnClickListener？=空，你忘了带问号让它为空哦是的，谢谢mangkool！你什么意思@Animeshsahuth这个答案和这个问题无关，或者是真的吗？在对这个问题的评论中，他说他想进行一次提醒对话，我给了他一个例子@AnimeshSahu