Scroll slider in android?

I am new to android.I made string array.It has more elements starts with A to Z . I make list View for the array.When i scroll the screen i wish to display the starting letter.If i remove the ha开发者_开发问答nd at the letter 's' then i will display the items starts with the letter 's'

as like the following link

http://www.youtube.com/watch?v=rcPIvGRwrxA

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You will want to use android:fastScrollEnabled="true" on a ListView for that.