Thumb scroll with large letter preview

Question

I'm using a ListView object with thumb scrolling enabled and am wondering how to include a large letter preview, as can be seen in the image below:

I know how to make the thumb scroll work; it's the large letter preview I'm looking for.

n.b. to get thumb scrolling to work, I added the following line to my ListView object in the layout XML:

android:fastScrollEnabled="true"

Answer 1

Check out the SectionIndexer interface. Example @ http://spinettaro.blogspot.co.uk/2011/11/android-snippet-code-android-listview.html