Android kotlin: AlertDialog multiple choice 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.Android AlertDialog is composed of three regions: title, content area and action buttons. Android AlertDialog is the subclass of Dialog class.
MainActivity.kt

class MainActivity : AppCompatActivity() {
    private var initialCheckedItems =  mutableListOf<Boolean>()
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val context = this
        button.setOnClickListener {
            val builder = MaterialAlertDialogBuilder(context)
            builder.setTitle("Select favorite colors (min 2)")
            val colors = arrayOf(
                "African violet",
                "Alice blue",
                "Alloy orange",
                "Android green",
                "Amaranth pink",
                "Antique bronze"
            )
            if (initialCheckedItems.isEmpty()){
                repeat(colors.count()) {initialCheckedItems.add(false)}
            }
            builder.setMultiChoiceItems(
                colors,
                initialCheckedItems.toBooleanArray()
            ) { dialog, which, isChecked ->}
            builder.setPositiveButton("Submit"){dialog,which->
                val alertDialog = dialog as AlertDialog
                val sparseBooleanArray = alertDialog.listView.checkedItemPositions
                var counter = 0
                textView.text = ""
                colors.forEachIndexed { index, s ->
                    if (sparseBooleanArray.get(index, false)) {
                        textView.append("\n$s")
                        counter += 1
                    }
                }
                if (counter > 0) {
                    textView.text = "Selected colors: " + textView.text
                }
            }

            // alert dialog neutral button
            builder.setNeutralButton("Cancel"){dialog,which->
                textView.text = ""
            }
            // set dialog non cancelable
            builder.setCancelable(false)
            // finally, create the alert dialog and show it
            val dialog = builder.create()
            dialog.show()
            // initially enable disable the positive button
            if((initialCheckedItems.filter { it }).size < 2){
                dialog.getButton(AlertDialog.BUTTON_POSITIVE).isEnabled = false
            }

            // dialog list item click listener
            dialog.listView.onItemClickListener =
                AdapterView.OnItemClickListener { parent, view, position, id ->
                    val sparseBooleanArray = dialog.listView.checkedItemPositions
                    var checkedItems = 0
                    colors.forEachIndexed { index, s ->
                        if (sparseBooleanArray.get(index,false)){
                            checkedItems +=1
                            initialCheckedItems[index] = true
                        }else{
                            initialCheckedItems[index] = false
                        }
                    }
                    dialog.getButton(AlertDialog.BUTTON_POSITIVE)
                        .isEnabled = checkedItems >=2
                }
        }
    }
}

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="#E30022"
        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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