[android-developers] How to detect click on complex images/polygons

I am trying to have a complex image like this[http://
members.quicknet.nl/lm.broers/download/riskmap_en.png] in my
application. I want to let users click on the complex polygons
(countries with borders in this case) and highlight the polygon they
clicked on. I have the images that I need to use for that state.

How can I achieve this in android. [Preferably from Java but please
let me know any other options that are feasible].

Thank you

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