Android SearchView setOnActionExpandListener doesn't work
I solved the problem: the onActionExpandListener works only if the ActionView of my MenuItem is marked also as collapseActionView in my menu file. So I modified it in this way:
<item
android:id="@+id/search"
android:title="@string/search_title"
android:orderInCategory="1"
android:icon="@android:drawable/ic_menu_search"
app:showAsAction="ifRoom|collapseActionView"
app:actionViewClass="android.widget.SearchView" />