how to make the section header of a SeparatedListAdapter push the previous section while scrolling?

I am using a SeparatedListAdapter. The Next section's header when reaches the top, the section header changes abruptly. In case of an iOS app, the next section's header pushes up the old se开发者_C百科ction header and takes its position. how to implement that in an android app? any help?

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Here is a demo application and source code.

Screen Shots of this demo :

Thanks to developers of this listview demo.

Enjoy.

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And Another API is here.