Simple spinner, but based on EditText

DataItem.kt

// sample data item, you can make your own
data class DataItem(
        private val title: String,
        private val id: Int
): EditTextSpinner.PopItem {
    override fun getTitle() = title
    override fun getId() = id
}

EditTextSpinner.kt

class EditTextSpinner : TextInputEditText {

    private val window: ListPopupWindow
    private val adapter: SpinnerAdapter

    constructor (context: Context) : super(context) {
        window = ListPopupWindow(this.context)
        adapter = SpinnerAdapter(context, R.layout.item_spinner) // use your item layout here
        init()
    }

    constructor (context: Context, attrs: AttributeSet) : super(context, attrs) {
        window = ListPopupWindow(this.context)
        adapter = SpinnerAdapter(context, R.layout.item_spinner)
        init()
    }

    constructor (context: Context, attrs: AttributeSet, defStyleAttr: Int) : super(context, attrs, defStyleAttr) {
        window = ListPopupWindow(this.context)
        adapter = SpinnerAdapter(context, R.layout.item_spinner)
        init()
    }

    private fun init() {
        isCursorVisible = false
        isFocusable = false
        window.anchorView = this
        window.isModal
        window.setAdapter(adapter)
        setOnClickListener { window.show() }
    }

    fun setItems(items: List<PopItem>) {
        adapter.items = items
    }

    fun setOnItemClickListener(clicker: (item: PopItem) -> Unit) {
        window.setOnItemClickListener { _, _, position, _ ->
            val popItem = adapter.items[position]
            setText(popItem.getTitle())
            clicker.invoke(popItem)
            window.dismiss()
        }
    }

    private inner class SpinnerAdapter(context: Context, val resource: Int) :
            ArrayAdapter<PopItem>(context, resource) {

        var items = listOf<PopItem>()
            set(value) {
                field = value
                notifyDataSetChanged()
            }

        override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
            val local = convertView ?: LayoutInflater.from(context).inflate(resource, parent, false)
            val user = items[position]
            local.spinnerItemText.text = user.getTitle()
            return local
        }

        override fun getCount() = items.size
    }

  // interface for your data item
    interface PopItem {
        fun getTitle(): String
        fun getId(): Int
    }
}

item_spinner.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/spinnerItemText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:padding="4dp"
    android:textSize="18sp" />

MainActivity.kt

//usage
override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.container)
        val availabilityTimeArray = resources!!.getStringArray(R.array.availability_time).mapIndexed { index, s ->
            DataItem(s, index)
        }
        spinnerTest.setItems(availabilityTimeArray)
        spinnerTest.setOnItemClickListener {
            //todo send this to presenter
        }
}