Android Kotlin - 如何將 DialogInterface.OnClickListener 的默認值設置為 function 參數？

Question

這是我的 function 聲明：

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

如何為“OnYes：DialogInterface.OnClickListener”設置默認值？

我試過 OnYes：DialogInterface.OnClickListener = null 但它不起作用。

Answer 1

@mangkool 提供的答案

OnYes：DialogInterface.OnClickListener？ = null

Answer 2

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()