Spinner with dropdown items that can be disabled and then not selectable

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"
    tools:context=".MainActivity">

    <Spinner
        android:id="@+id/spinner"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

background_selector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:color="@color/grey" android:state_enabled="false"/>
    <item android:color="@color/black"/>
</selector>

City.kt

data class City(val name: String, val isEnabled: Boolean) {

    override fun toString(): String {
        return name
    }
}

CityAdapter.kt

class CityAdapter(
    var cities: List<City>,
    context: Context
) : ArrayAdapter<City>(
    context,
    android.R.layout.simple_spinner_item,
    cities
) {

    init {
        setDropDownViewResource(R.layout.simple_spinner_dropdown_item)
    }

    override fun getDropDownView(position: Int, convertView: View?, parent: ViewGroup): View =
        (super.getDropDownView(position, convertView, parent) as TextView).apply {
            val city = cities[position]
            text = city.name
            isEnabled = city.isEnabled
        }

    override fun isEnabled(position: Int): Boolean = cities[position].isEnabled
}

MainActivity.kt

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        setupSpinner()
    }

    private fun setupSpinner() {
        spinner.adapter = CityAdapter(
            listOf(
                City("Florianópolis", true),
                City("Buenos Aires", false),
                City("New York", true),
                City("Toronto", false),
                City("Halifax", false),
                City("London", true),
                City("Lisboa", true)
            ),
            this
        )
    }

}

simple_spinner_dropdown_item.xml

<?xml version="1.0" encoding="utf-8"?>
<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/text1"
    style="?android:attr/spinnerDropDownItemStyle"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ellipsize="marquee"
    android:paddingTop="16dp"
    android:paddingBottom="16dp"
    android:singleLine="true"
    android:textColor="@drawable/background_selector" />