Android - ขอสอบถามเรื่อง Methods onListItemClick ใน ListFragment

import android.app.Activity;
import android.app.ListFragment;
import android.os.Bundle;
import android.text.TextWatcher;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;

public class ActivityLeft extends ListFragment {
	
	EditText searchBox;
	String [] titles;
	OnMyListSelectedListener mCallback;
	private TextWatcher textSearchOnChanged;
	
	 
	public interface OnMyListSelectedListener {
		public void onMyListSelected(String title, int position);
	}


	
	@Override 
	public void onCreate(Bundle savedInstanceState){
		super.onCreate(savedInstanceState);
 
			
			titles = new String[] { "สถานที่ตากอากาศเกาะแก่ง", "บ้านริมหาด เกาะล้าน", "ชายหาดพัทยาจอมเทียน", 
					"ขับรถชมวิวแสงไฟกลางคืน", "Next Generation", "Remote Gate",  
				"เครื่องกรองอากาศ", "เครื่องกรองน้ำ", "Tablet 7 Android", "Tablet 10.1 Android", "Android.com"};
				
			
		ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), 

				android.R.layout.simple_list_item_activated_1, titles);
		setListAdapter(adapter);
		
	}
	
		@Override
	public void onStart() {
	    super.onStart();
	        getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);

	}

		@Override
		public void onAttach(Activity activity){
			super.onAttach(activity);
			try {
				mCallback = (OnMyListSelectedListener) activity;
			} catch (ClassCastException e) {
				throw new ClassCastException(activity.toString() 
						+ " must implement on..listener");
			}
			
		}

	    @Override
		public void onListItemClick(ListView l, View v, int position, long id) {

			mCallback.onMyListSelected(titles[position], position);
				
		}

}