[Activity(Label = "Content Loader", MainLauncher = true, Icon = "@drawable/icon")]
    public class Activity1 : ListActivity, Android.Widget.SearchView.IOnQueryTextListener, LoaderManager.ILoaderCallbacks
    {
        // This is the Adapter being used to display the list's data.
        SimpleCursorAdapter mAdapter;

        // If non-null, this is the current filter the user has provided.
        String mCurFilter;

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            // Give some text to display if there is no data.  In a real
            // application this would come from a resource.
            //setEmptyText("No phone numbers");

            // We have a menu item to show in action bar.
            //setHasOptionsMenu(true);


            // Create an empty adapter we will use to display the loaded data.
            mAdapter = new SimpleCursorAdapter(this,
                    Android.Resource.Layout.SimpleListItem2, null,
                    new String[] { Android.Provider.ContactsContract.ContactsColumns.DisplayName,
                        Android.Provider.ContactsContract.ContactStatusColumns.ContactStatus },
                    new int[] { Android.Resource.Id.Text1, Android.Resource.Id.Text2 }, 0);
            ListAdapter = mAdapter;
            // Prepare the loader.  Either re-connect with an existing one,
            // or start a new one.
            LoaderManager.InitLoader(0, bundle, this);
        }

        public override bool OnCreateOptionsMenu(IMenu menu)
        {
            // Place an action bar item for searching.

            IMenuItem item = menu.Add("Search");
            item.SetIcon(Android.Resource.Drawable.IcMenuSearch);
            item.SetShowAsAction(Android.Views.ShowAsAction.IfRoom);
            SearchView sv = new SearchView(this);
            sv.SetOnQueryTextListener(this);
            item.SetActionView(sv);

            return base.OnCreateOptionsMenu(menu);
        }

        protected override void OnListItemClick(ListView l, View v, int position, long id) {
            // Insert desired behavior here.
            Android.Util.Log.Info("Content Loader Example", "Item clicked: " + id);
        }

        public CursorLoader OnCreateLoader(int id, Bundle args)
        {
            // This is called when a new Loader needs to be created.  This
            // sample only has one Loader, so we don't care about the ID.
            // First, pick the base URI to use depending on whether we are
            // currently filtering.
            Android.Net.Uri baseUri;
            if (mCurFilter != null)
            {
                baseUri = Android.Net.Uri.WithAppendedPath(Contacts.People.ContentFilterUri,
                        Android.Net.Uri.Encode(mCurFilter));
            }
            else
            {
                baseUri = Contacts.ContentUri;
            }

            // Now create and return a CursorLoader that will take care of
            // creating a Cursor for the data being displayed.
            String select = "((" + ContactsContract.ContactsColumns.DisplayName + " NOTNULL) AND ("
                    + ContactsContract.ContactsColumns.HasPhoneNumber + "=1) AND ("
                    + ContactsContract.ContactsColumns.DisplayName + " != '' ))";
            return new CursorLoader(this, baseUri,
                    CONTACTS_SUMMARY_PROJECTION, select, null,
                    ContactsContract.ContactsColumns.DisplayName + " COLLATE LOCALIZED ASC");
        }

        // These are the Contacts rows that we will retrieve.
        static String[] CONTACTS_SUMMARY_PROJECTION = new String[] {
            //Contacts._ID,
            //Contacts.DISPLAY_NAME,
            //Contacts.CONTACT_STATUS,
            //Contacts.CONTACT_PRESENCE,
            //Contacts.PHOTO_ID,
            //Contacts.LOOKUP_KEY,
            Android.Provider.ContactsContract.Contacts.InterfaceConsts.Id,
            Android.Provider.ContactsContract.ContactsColumns.PhotoId,
            Android.Provider.ContactsContract.ContactsColumns.LookupKey,
            Android.Provider.ContactsContract.ContactsColumns.DisplayName,
            Android.Provider.ContactsContract.ContactStatusColumns.ContactStatus,
            Android.Provider.ContactsContract.StatusColumns.Status,
            Android.Provider.ContactsContract.StatusColumns.Presence,
        };

        public void OnLoadFinished(CursorLoader loader, Android.Database.ICursor data)
        {
            // Swap the new cursor in.  (The framework will take care of closing the
            // old cursor once we return.)
            mAdapter.SwapCursor(data);
        }

        public void onLoaderReset(CursorLoader loader)
        {
            // This is called when the last Cursor provided to onLoadFinished()
            // above is about to be closed.  We need to make sure we are no
            // longer using it.
            mAdapter.SwapCursor(null);
        }

        bool SearchView.IOnQueryTextListener.OnQueryTextChange(string newText)
        {
            mCurFilter = !String.IsNullOrEmpty(newText) ? newText : null;
            LoaderManager.RestartLoader(0, null, this);
            return true;
        }

        bool SearchView.IOnQueryTextListener.OnQueryTextSubmit(string query)
        {
            throw new NotImplementedException();
        }

        void IDisposable.Dispose()
        {
            //throw new NotImplementedException();
        }

        //IntPtr IJavaObject.Handle
        //{
        //    get { throw new NotImplementedException(); }
        //}

        Loader LoaderManager.ILoaderCallbacks.OnCreateLoader(int id, Bundle args)
        {
            return LoaderManager.GetLoader(id);
        }

        public void OnLoadFinished(Loader loader, Java.Lang.Object data)
        {
            //throw new NotImplementedException();
        }

        public void OnLoaderReset(Loader loader)
        {
            //throw new NotImplementedException();
        }
    }