My book teaches the Java language and those APIs that are useful in Android apps. Although Chapter 1 provides an introduction to Android, the focus is really on Java as a prelude to getting into Android app development.
I've also created a separate 96-page Appendix C PDF that provides an introduction to Android app development. You can obtain a free copy from http://www.apress.com/9781430264545 -- click the Source Code/Downloads tab followed by the Download Now link. I do discuss UI development in the appendix.
All the best.
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