Android Kotlin-如何设置DialogInterface.OnClickListener的默认值作为函数参数？

由择一城终老发布于 2020-05-09 13:59:32

这是我的函数声明：

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

如何为“ OnYes：DialogInterface.OnClickListener”设置默认值？

我已经尝试过OnYes：DialogInterface.OnClickListener = null，但是不起作用。

听风在唱歌

2020-05-09 13:59:33

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()

hid

2020-05-09 13:59:33

答案由@mangkool提供

OnYes：DialogInterface.OnClickListener？ =空

择一城终老

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