I assume you are referring to the Practical Android Projects book by Lucas Jordan and Pieter Greyling (myself) that is featured this week on JavaRanch.
In answer to your question, I quote from another post.
Lucas Jordan wrote:I think this book is different because it reaches outside of the normal Android development process. Pieter did an excellent job of showing that Android is more than just a Java development environment. And I think I showed that HTML and Flex/AIR apps are valid technologies on Android. We tried not to waste pages on things that are easily googled, we wanted to show how flexible Android is, and how well it can fit into a bigger development ecosystem, interacting with services and reusing code.