It shouldn't be too difficult. If you have a byte stream of the bitmap, then 
just set the pixels on the first/last row/col to black where you want to 
stretch the image and set the other pixels to zero. Then you could remain 
the image *.9.png and then load it as a normal 9 patch drawable resource.

There's more info on the 9-patch at this 
link<http://developer.android.com/guide/topics/graphics/2d-graphics.html#nine-patch>,
 
so you can know which pixels you want to set as black and which to keep 
clear.

Here's the big caveat: I've never done this programmatically, but I have 
drawn all my 9-patch images by hand in the GIMP setting the 9 patch pixels 
myself, so I don't think it'd be too hard to do in code.

Nick

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