contacts not showing in activity

I am trying to show contacts in an activity but its not working. I review my code, But not able to understand whats the problem is. Here is my code:-

/deleted/

showfriendlist.xml

    <RelativeLayout xmlns:android="http://ift.tt/nIICcg"
        xmlns:tools="http://ift.tt/LrGmb4"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <ListView
            android:id="@+id/lst_contacts"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

    </RelativeLayout>