Many books — such as The Busy Coder's Guide to Android Development, — present programming topics, showing you how to use different APIs, tools, and so on.
This book is different.
This book has you build an app from the beginning. Whereas traditional programming guides are focused on breadth and depth, this book is focused on "hands-on", guiding you through the steps to build the app. It provides a bit of details on the underlying concepts, but it relies on other resources — such as The Busy Coder's Guide to Android Development — for the full explanation of those details. Instead, this book provides step-by-step instructions for building the app.