Now I know how to do it. SearchView
have to be added as menu item like this:
<item
android:id="@+id/menu_search"
android:icon="@drawable/ic_action_search"
android:title="@string/projects_menu_search"
app:actionViewClass="android.support.v7.widget.SearchView"
app:showAsAction="always|collapseActionView"/>
The key is that it is set as actionView
and icon
is set too. After tapping on icon actionView become visible and "up" button also appear. Tapping on "up" button collapses actionView.