Currently there is no usable official working version of Android for PI By the RPF or Google one with driver support!
Official announcement is in the FAQ, here: http://www.raspberrypi.org/help/faqs/#softwareAndroid
For the latest info, goto: http://androidpi.wikia.com/wiki/Android_Pi_Wiki
For the Google group that is still working on it you can go here: https://groups.google.com/forum/#!forum/android-rpi
Unofficial versions of Android that work reasonably well are now popping up, they still lack hardware driver support for the GPU, but for example see this: