Android Spinner (Dropdown/Combobox) Tutorial (Kotlin)

<Spinner
    android:id="@+id/positionSpinner"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />

val adapter = ArrayAdapter(context, android.R.layout.simple_spinner_item, listOf("None", "Top", "Bottom"))adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)positionSpinner.adapter = adapter

positionSpinner.onItemSelectedListener = object: AdapterView.OnItemSelectedListener {    override fun onNothingSelected(parent: AdapterView<*>?) {    }    override fun onItemSelected(parent: AdapterView<*>, view: View?, position: Int, id: Long) {        // either one will work as well        // val item = parent.getItemAtPosition(position) as String        val item = adapter.getItem(position)    }}

<Spinner
    android:id="@+id/positionSpinner"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" 
    style="@style/Base.Widget.AppCompat.Spinner.Underlined" />

<Spinner
    android:id="@+id/positionSpinner"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" 
    android:spinnerMode="dialog" />