But today, we're making what might just be the most exciting announcement of all: we and our Open Handset Alliance partners have now released the source code for Android. There's a huge amount of code and content there, so head over to http://source.android.com/ for all the details.
I'd like to offer a huge thank you and congratulations to my colleagues and the Alliance partners for what I hope will be a red-letter day for the open source community, and openness in the mobile industry.
Source: Android Developers Blog