Android™ How to Program, Second Edition

Working with Open-Source Apps

There are numerous free, open-source Android apps available online which are excellent resources for learning Android app development. We encourage you to download open-source apps and read their source code to understand how they work. Throughout the book you’ll find programming exercises that ask you to modify or enhance existing open-source apps. Our goal is to give you handles on interesting problems that may also inspire you to create new apps using the same technologies. Caution: The terms of open source licenses vary considerably. Some allow you to use the app’s source code freely for any purpose, while others stipulate that the code is available for personal use only—not for creating for-sale or publicly ...