Colored buildings in Google Android maps API v2

I'm a bit new to Android, so please don't hesitate.

I am developing an Android application for my campus. I am currently using my Google Maps API (V2).

To interrupt the chase, I want to paint every building on my campus with a specific color (some blue, some green, etc.). However, I can't seem to find a way to do this (except maybe with the GroundOverlay image, which is the exact size and orientation of the building, but it's very tedious).

Does anyone have any better ideas? Am I missing a method that can do this for me easily?