The source code for the Android 4.1 platform and software stack has been released! This release allows OEMs to begin preparing Android 4.1 for installation on new and existing devices, and allows hobbyists, enthusiasts, and researchers to develop custom builds. For information on how to obtain the software, visit our Getting the Source page.
The Compatibility Definition Document for Android 4.0 has been published. Android 4.0 allows device manufacturers to use the Android source code to ship a significantly wider variety of devices including phones and tablets. For more information, visit the Compatibility page.