http://androidcookbook.com/ is a community-written web site which has also been used to create an O'Reilly Cookbook, both about how to build great Android applications.
It is full of how-to information along with code snippets that illustrate the ideas presented. It features both how-to's that overlap with the official documentation, and material that goes beyond this to be more tutorial, more in-depth, or explaining "lessons from the trenches": what actually works to get the application functioning well. Unlike most books written by one, two or a few individuals, this one has input from dozens of contributors, who were all able to view and comment on each others' recipes before the book was published. The published version(s) include printed books, eBooks, and other uses. And long after the book was first published in 2012, this site will continue to exist - with a larger collection of recipes than will fit in the published book - and serve as an Android developer resource site long after.