The first thing that comes to mind is java.awt.Polygon.contains(). I've used
it, but obviously with AWT and also with polygon data from
http://www.census.gov/geo/www/cob/
One approach then would be to find a similar Android polygon class that can
be used to draw and hit test your map and a way to convert the map's bitmap
image into a vector image, or at least a vector overlay for the bounds hit
test.
There are some ways you can get vector from a bitmap. I've used Visio by
putting the image on one layer and tracing out the vector shapes in another
layer, then writing some VB to export the shape vector data to XML. Do you
have Adobe CS? That might have some tools for converting bitmap shapes to
vectors. Or perhaps the image was originally authored with vectors?
There may also be some clever ways to do hit tests on the color values in
the bitmap.
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