Android Activity ListView Items not opening respective fragments when clicked - android-fragments

Question

I have an activity which has only one listview. I have set the listview onClick Listener which is supposed to open a new fragment depending in which list item was clicked, I've checked but cant understand why the List item clicks cannot work
Below is the code foe that activity
package com.jp.kabs.mybills;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import java.util.ArrayList;
import adapters.NavDrawerAdapter;
import models.NavDrawerItemModel;
/**
* Created by Kabunyi on 27/05/2015.
*/
public class MainActivity extends ActionBarActivity {
private ListView lstMain;
private String[] menuItems;
private TypedArray menuIcons;
private NavDrawerAdapter adapter;
private ArrayList<NavDrawerItemModel> navDrawerItems;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
connnectToXML();
lstMain.setOnItemClickListener(new DrawerItemsClickListener());
//fetch resources
// load slide menu items
menuItems = getResources().getStringArray(R.array.nav_drawer_items);
// nav drawer icons from resources
menuIcons = getResources().obtainTypedArray(R.array.nav_drawer_icons);
addStuffToArrayList();
}
private void connnectToXML(){
lstMain = (ListView)findViewById(android.R.id.list);
}
private void addStuffToArrayList(){
navDrawerItems = new ArrayList<NavDrawerItemModel>();
// adding nav drawer items to array
// Home
navDrawerItems.add(new NavDrawerItemModel(menuItems[0], menuIcons.getResourceId(0, -1)));
// Find People
navDrawerItems.add(new NavDrawerItemModel(menuItems[1], menuIcons.getResourceId(1, -1)));
// Photos
navDrawerItems.add(new NavDrawerItemModel(menuItems[2], menuIcons.getResourceId(2, -1)));
// Communities, Will add a counter here
navDrawerItems.add(new NavDrawerItemModel(menuItems[3], menuIcons.getResourceId(3, -1), true, "22"));
// Pages
navDrawerItems.add(new NavDrawerItemModel(menuItems[4], menuIcons.getResourceId(4, -1)));
// What's hot, We will add a counter here
//navDrawerItems.add(new NavDrawerItemModel(navMenuTitles[5], navMenuIcons.getResourceId(5, -1), true, "50+"));
// Recycle the typed array
menuIcons.recycle();
// setting the nav drawer list adapter
adapter = new NavDrawerAdapter(navDrawerItems, getApplicationContext());
lstMain.setAdapter(adapter);
}
//method to display a view fragment of choice
private void displayView(int position){
//update the main content by replacing fragments
Fragment frag = null;
switch (position){
case 0:
frag = new AddMyBillsFragment();
AddMyBillsFragment selectedBillerToEasyPayFrag = new AddMyBillsFragment();
getSupportFragmentManager().
beginTransaction().
replace(R.id.my_layout, selectedBillerToEasyPayFrag, "BillerToEasyPayDetails").addToBackStack(null).commit();
break;
case 1:
frag = new ViewMyBillsFragment();
break;
case 2:
frag = new PayMyBillsFragment();
break;
case 3:
frag = new EasyPayFragment();
break;
case 4:
frag = new MyBillAlertsFragment();
break;
default:
break;
}
if(frag !=null){
//FragmentManager fm = getSupportFragmentManager();
//fm.beginTransaction().replace(R.id.frame_container, frag).commit();
FragmentManager fm = getSupportFragmentManager();
fm.beginTransaction().replace(R.id.my_layout, frag).commit();
//update selected items and title then close drawer
lstMain.setItemChecked(position, true);
lstMain.setSelection(position);
setTitle(menuItems[position]);
//}else{
Log.e("MenuActivity", "Error in creating fragment");
}
}
//class to handle drawer list item clicks
private class DrawerItemsClickListener implements ListView.OnItemClickListener{
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
displayView(position);
}
}
}
Kindly assist
Code for activity main
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/my_layout"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>