<menu xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" > <-- added this line <item android:id="@+id/action_settings" android:icon="@android:drawable/ic_menu_add" android:title="@string/action_settings" app:showAsAction="always"/> <-- added this line. not android:showAsAction </menu>
도움받은 곳 : http://stackoverflow.com/a/18380187/1025379