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Table of Contents
Chapter 1. An Introduction to RxJava
Sharp Learning Curve, Big Rewards
Observables
Observers
Observable Creation and Subscribers
Schedulers
Operators
Conclusion
Chapter 2. RxJava in Your Android Code
RxJava and the Activity Lifecycle
Avoiding Memory Leaks
Avoiding Re-querying for Data Upon Configuration Changes
Why RxJava-based Solutions Are Awesome
Conclusion
Chapter 3. The Future of RxJava for Android Development
Further Reading for RxJava 
Future Directions for Android App Development with RxJava
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RxJava for Android App Development A Quick Look for Developers K. Matt Dupree
Additional Resources 4 Easy Ways to Learn More and Stay Current Programming Newsletter Get programming related news and content delivered weekly to your inbox. oreilly.com/programming/newsletter Free Webcast Series Learn about popular programming topics from experts live, online. webcasts.oreilly.com O’Reilly Radar Read more insight and analysis about emerging technologies. radar.oreilly.com Conferences Immerse yourself in learning at an upcoming O’Reilly conference. conferences.oreilly.com ©2015 O’Reilly Media, Inc. The O’Reilly logo is a registered trademark of O’Reilly Media, Inc. #15305
RxJava for Android App Development K. Matthew Dupree
RxJava for Android App Development by K. Matt Dupree Copyright © 2015 O’Reilly Media, Inc.. All rights reserved. Printed in the United States of America. Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472. O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (http://safaribooksonline.com ). For more sales department: 800-998-9938 or corporate@oreilly.com. corporate/institutional information, contact our Editor: Meghan Blanchette Production Editor: Nicole Shelby Copyeditor: Kim Cofer Interior Designer: David Futato Cover Designer: Randy Comer Illustrator: Rebecca Demarest October 2015: First Edition Revision History for the First Edition 2015-09-28: First Release See http://oreilly.com/catalog/errata.csp?isbn=9781491939338 for release details. The O’Reilly logo is a registered trademark of O’Reilly Media, Inc. RxJava for Android App Development, the cover image, and related trade dress are trademarks of O’Reilly Media, Inc. While the publisher and the author have used good faith efforts to ensure that the information and instructions contained in this work are accurate, the publisher and the author disclaim all responsibility for errors or omissions, including without limi‐ tation responsibility for damages resulting from the use of or reliance on this work. Use of the information and instructions contained in this work is at your own risk. If any code samples or other technology this work contains or describes is subject to open source licenses or the intellectual property rights of others, it is your responsi‐ bility to ensure that your use thereof complies with such licenses and/or rights. 978-1-491-93933-8 [LSI]
Table of Contents An Introduction to RxJava. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Sharp Learning Curve, Big Rewards 1 Observables 3 Observers 4 Observable Creation and Subscribers 6 Schedulers 8 Operators 10 Conclusion 13 RxJava in Your Android Code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 RxJava and the Activity Lifecycle 15 Why RxJava-based Solutions Are Awesome 21 Conclusion 29 The Future of RxJava for Android Development. . . . . . . . . . . . . . . . . 31 Further Reading for RxJava 31 Future Directions for Android App Development with RxJava 32 iii
An Introduction to RxJava Sharp Learning Curve, Big Rewards I was pretty much dragged into RxJava by my coworkers...[RxJava] was a lot like git...when I first learned git, I didn’t really learn it. I just spent three weeks being mad at it...and then something clicked and I was like ‘Oh! I get it! And this is amazing and I love it!' The same thing hap‐ pened with RxJava. —Dan Lew1 As Dan Lew, a Google Developer Expert Android Developer, points out in the preceding quotation, RxJava can be very difficult to learn. This is unfortunate because, for reasons I point out in the next chap‐ ter, RxJava can make asynchronous data handling in Android apps much cleaner and more flexible. In this chapter, I provide a basic introduction to RxJava. If you are skeptical that RxJava is worth learning about, given its steep learning curve, skip ahead to the second section of the next chapter. In that section, I go over a situation in which RxJava pro‐ vides us with advantages over traditional ways of handling asyn‐ chronous data in Android applications. Although you won’t under‐ stand exactly how the code in that section works, you will be able to see how RxJava makes quick work of tasks that can often become messy and inflexible when handled without RxJava. After seeing how much cleaner RxJava can make your Android code, hopefully you will have the motivation to return here to this introduction. 1 Fragmented podcast, Episode 3, “The RxJava Show,” 32:26-32:50. 1
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