This document lists out the various steps which you need to follow to setup the Android Development environment on Windows OS. For instructions on how to setup on Linux and Mac, please refer

http://developer.android.com/sdk/installing.html

Google provides via Google play a library for using Google Maps in Android applications. You can use Google Maps Android API V2 in Android applications. The V2 version is an improved form of V1. In V1 version, MapView displayed map component, which is now deprecated, whereas the version V2 uses the MapFragment class for displaying the map component.