Adding SearchView in Fragment

Question

Trying to include a searchview in actionbar. For this, I have done the following:

Created MenuSearch.xml in the menu folder as given below:

Answer 1

In my fragment's onCreateOptionsMenu the code

SearchManager searchManager =
        (SearchManager)getActivity().getSystemService(Context.SEARCH_SERVICE);
SearchableInfo searchableInfo =
        searchManager.getSearchableInfo(getActivity().getComponentName());
searchItem = menu.findItem(R.id.menu_search);
SearchView searchView = (SearchView) searchItem.getActionView();
searchView.setSearchableInfo( searchableInfo);

produced following error message: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v7.widget.SearchView.setSearchableInfo (android.app.SearchableInfo)' on a null object reference

After i changed in menu.xml android:actionViewClass to app:actionViewClass the problem did not occur again. menu.xml :