Android Spinner (Dropdown/Combobox) Tutorial (Kotlin)
June 16, 2018Declare Spinner
in XML layout.
<Spinner
android:id="@+id/positionSpinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
Load a list of string as spinner data source.
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
Listen to which item is selected.
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)
}
}
To add underline to spinner.
<Spinner
android:id="@+id/positionSpinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
style="@style/Base.Widget.AppCompat.Spinner.Underlined" />
To show item selection dropdown as fullscreen dialog.
<Spinner
android:id="@+id/positionSpinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:spinnerMode="dialog" />
References
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