<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
   
    <item
        android:id="@+id/favorites_search"
        android:icon="@drawable/favorite_search"
        android:imeOptions="actionSearch"
        android:inputType="textCapWords"
        android:title="@string/action_search"
        app:actionViewClass="android.support.v7.widget.SearchView"
        app:showAsAction="always|collapseActionView"></item>

</menu>

 @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_favorites, menu);
        MenuItem searchItem = menu.findItem(R.id.favorites_search);
        SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem);
        MenuItemCompat.setOnActionExpandListener(searchItem, new MenuItemCompat.OnActionExpandListener() {
            @Override
            public boolean onMenuItemActionExpand(MenuItem item) {
                return true;
            }

            @Override
            public boolean onMenuItemActionCollapse(MenuItem item) {
                return true;
            }
        });
        return true;