There are several "good" Android books on the market. However, I do not know that there is truly an exceptional book available. Is your book that book, and if so, what separates it from the rest of the books on the market to make it that truly exceptional book?
My book focuses on teaching Java basics (language and key APIs, such as Collections) in lieu of teaching Android development. A person should understand Java before trying to also learn Android architecture and other concepts.
In the latest (and my final) edition, I introduce Android in Chapter 1. In Appendix C, which is distributed as a free 96-page PDF file in the book's code file (you can obtain the book's ZIP file at http://www.apress.com/9781430264545 -- click the Source Code/Downloads tab followed by the Download Now link), I provide a rapid introduction to Android in terms of tools, architecture, and sample apps.
Attempting to compare my book with other "Android" books would be like comparing apples and oranges.
All the best.
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