Handling SearchView in Xamarin.Android using OnActionExpandListener Class

Activity1.cs

override public bool OnCreateOptionsMenu(IMenu menu)
{
    MenuInflater inflater = this.MenuInflater;
    inflater.Inflate(Resource.Menu.NoteListActions, menu);
    IMenuItem item;

    item = menu.FindItem(Resource.Id.action_search);
    SearchManager searchManager = (SearchManager)GetSystemService(Context.SearchService);
    SearchView searchView = (SearchView)item.ActionView;
    searchView.SetSearchableInfo(searchManager.GetSearchableInfo(this.ComponentName));
    searchView.SetIconifiedByDefault(false);
    
    searchView.QueryTextSubmit += (sender, e) =>
    {
        string query = e.Query;
        if (query != null && query.Trim() != "")
        {
            FragmentManager fm = me.FragmentManager;
            NoteListFragment f = fm.FindFragmentById <MyFragment> (Resource.Id.note_list_frag);
            f.doQuery(query);
            IMenuItem searchMenuItem = menu.FindItem(Resource.Id.action_search);
            if (searchMenuItem != null)
            {
                searchMenuItem.CollapseActionView();
            }
        }
        e.Handled = true;
    };
    searchView.QueryTextChange += (sender, e) =>
    {
        e.Handled = true;
    };

    item = menu.FindItem(Resource.Id.action_search);
    var actionExpand = new Support.OnActionExpandListener();            
    actionExpand.MenuItemCollaspe += (sender, e) =>
    {
        e.Handled = true;
    };
    actionExpand.MenuItemActionExpand += (sender, e) =>
    {
        SearchView sv = (SearchView)e.MenuItem.ActionView;
        sv.SetQueryHint("Search");
        e.Handled = true;
    };
    Android.Support.V4.View.MenuItemCompat.SetOnActionExpandListener(item, actionExpand);

    return base.OnCreateOptionsMenu(menu);
}

gistfile1.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:myapp="http://schemas.android.com/apk/res-auto"
    >
  <item android:id="@+id/action_search"
          android:title="Search"
          android:queryHint="Search"
          android:icon="@android:drawable/ic_menu_search"          
          android:actionViewClass="android.widget.SearchView" 
          android:showAsAction="always|collapseActionView"
    />
</menu>

OnActionExpandListener.cs

public class OnActionExpandListener : Java.Lang.Object, Android.Support.V4.View.MenuItemCompat.IOnActionExpandListener
{

    public class MenuItemEventArg : EventArgs { 
        public IMenuItem MenuItem {get;set;}
        public bool Handled { get; set; }

        public MenuItemEventArg() {
            Handled = false;
        }
    }
    public delegate void MenuItemEventHandler(object sender, MenuItemEventArg e);

    public event MenuItemEventHandler MenuItemCollaspe;
    public event MenuItemEventHandler MenuItemActionExpand;

    public bool OnMenuItemActionCollapse(IMenuItem item)
    {
        if (MenuItemCollaspe != null)
        { 
            MenuItemEventArg e = new MenuItemEventArg();
            e.MenuItem = item;
            MenuItemCollaspe(this, e);
            return e.Handled;
        }
        return true;
    }

    public bool OnMenuItemActionExpand(IMenuItem item)
    {
        if (MenuItemActionExpand != null)
        {
            MenuItemEventArg e = new MenuItemEventArg();
            e.MenuItem = item;
            MenuItemActionExpand(this, e);
            return e.Handled;
        }
        return true;
    }
}

Needs reference to Xamarin.Android.Support.V4 component.