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I had fairly low expectations from this book as the API is still in a state of flux, so if some of the examples needed tweaking that would have been alright. However, I could not even find any example code on the book's website as advertised on the back cover. This is a 400 page book so I expected to get at least some useful material from it, but the author does not even get past Hello World until over 100 pages. The material after that consists of repetitions of trivial code additions followed by regurgitation of the source. It would appear that the author was just trying to increase the page count with no real valuable content. There is no in-depth discussion of what Activities, Intents, etc. actually are or how they work. After this poor experience I went back to the online help and am finding it vastly more thorough and helpful. I would not recommend this book for any level of developer.