This open-source library contains utilities that are useful for a wide range of applications using the Google Maps Android API.
Marker clustering — handles the display of a large number of points
Heat maps — display a large number of points as a heat map
IconGenerator — display text on your Markers
Poly decoding and encoding — compact encoding for paths, interoperability with Maps API web services
Spherical geometry — for example: computeDistance, computeHeading, computeArea
KML — displays KML data
GeoJSON — displays and styles GeoJSON data