kotlinでspinner
setOnItemSelectedListenerではないので注意
val spinner = findViewById<Spinner>(R.id.spinner)
spinner.onItemSelectedListener =
object: AdapterView.OnItemSelectedListener {
override fun onItemSelected(p0: AdapterView<*>?, p1: View?, p2: Int, p3: Long) {
val i = p0 as Spinner
Toast.makeText(this@MainActivity, i.selectedItem.toString(), Toast.LENGTH_SHORT).show()
}
override fun onNothingSelected(p0: AdapterView<*>?) {
}
}