CommonsWare, LLC.
Information about the publisher:
From 2008 through 2021, CommonsWare published a series of books on Android application development. All are available now under the Creative Commons BY-SA 4.0 License. All are available for download as PDF, EPUB, or MOBI/Kindle editions, and some are available to read right from your Web browser. Combined, they total over 7,500 pages of material on a wide range of subjects.