Android kotlin: AlertDialog single choice items example

Android AlertDialog can be used to display the dialog message with OK and Cancel buttons. It can be used to interrupt and ask the user about his/her choice to continue or discontinue.AlertDialog single choice items example is composed of three regions: title, content area and action buttons. Android AlertDialog is the subclass of Dialog class.
MainActivity.kt

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val context = this
        button.setOnClickListener {
            val builder = MaterialAlertDialogBuilder(context)
            // dialog title
            builder.setTitle("Which is your favorite?")
            val colors = arrayOf(
                "African violet",
                "Alice blue",
                "Alloy orange",
                "Android green",
                "Amaranth pink",
                "Antique bronze"
            )
            // set single choice items
            builder.setSingleChoiceItems(
                colors, // array
                -1 // initial selection (-1 none)
            ){dialog, i ->}

            // alert dialog positive button
            builder.setPositiveButton("Submit"){dialog,which->
                val position = (dialog as AlertDialog).listView.checkedItemPosition
                // if selected, then get item text
                if (position !=-1){
                    val selectedItem = colors[position]
                    textView.text = "Favorite color : $selectedItem"
                }
            }
            // alert dialog other buttons
            builder.setNegativeButton("No",null)
            builder.setNeutralButton("Cancel",null)
            // set dialog non cancelable
            builder.setCancelable(false)
            // finally, create the alert dialog and show it
            val dialog = builder.create()
            dialog.show()
            // initially disable the positive button
            dialog.getButton(AlertDialog.BUTTON_POSITIVE).isEnabled = false
            // dialog list item click listener
            dialog.listView.onItemClickListener =
                OnItemClickListener { parent, view, position, id ->
                    // enable positive button when user select an item
                    dialog.getButton(AlertDialog.BUTTON_POSITIVE)
                        .isEnabled = position != -1
                }
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/constraintLayout"
    tools:context=".MainActivity">
    <com.google.android.material.button.MaterialButton
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:text="Show Dialog"
        android:backgroundTint="#4B5320"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        tools:text="TextView"
        android:textAppearance="@style/TextAppearance.AppCompat.Large"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button" />
</androidx.constraintlayout.widget.ConstraintLayout>

Result

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