Android scrollbar with a extra View (screenshot included)

i need some help again!

At first i really thought it was some kind of ScrollView tweak to achieve something like this:

But, as far as i know, it isnt, so, how can i achieve this kinda of custom scrollbar?

Thanks in advance开发者_JS百科!

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I finally found the solution. http://code.google.com/p/apps-for-android/, the Rings Extended app has a implementation of it!

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Looks like the handle displayed when you turn on fast scroll.

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Take a look at android:scrollbarThumbVertical and see if that helps. I haven't used it myself so far but it seems it may be what you need.

EDIT: Also see the API Demos -> View -> Scrollbars -> 2. Fancy.