create a android contactList view?

Hi i am trying to create a basic contact list that has same functionality has th开发者_StackOverflowe native one i.e. arranged in alphabetical order and have the scrolling thumb tab on the side to scroll through letters.

How do i create that scroll tab thing? i will use some sort of sorting algorithm to sort my contact list in order so that should be fine but im wondering how to do the fast thumb tab scroll seen in the pic below:

After several hours trying to solve this I finally found the incredibly simple answer. Simply enable fastscroll in the layout for the list.

<ListView
        android:id="@id/android:list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:fastScrollEnabled="true"
    /> 

http://developer.android.com/reference/android/widget/AbsListView.html#attr_android:fastScrollEnabled