SearchView in OptionsMenu not full width

Question

I have a working SearchView which expands in my OptionsMenu when the user taps on the search icon. However it only expands within the available space among the other Option

Answer 1

I had a similar issue, that the search bar did not fill the whole width,( but I had no other icons). I solved it by adding in item:

android:actionLayout="@layout/my_search_view"

and in layout/my_search_view.xml :