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Ivan Morgillo - RxJava Essentials

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Ivan Morgillo RxJava Essentials
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Learn reactive programming to create awesome Android and Java apps About This Book Create interactive Android apps with Java Reactive Extensions Learn Reactive Programming through real-life examples that you can use in your Android app eat Android concurrency and threading issues to take your apps to a new level Who This Book Is For If you are an experienced Java developer, reactive programming will give you a new way to approach scalability and concurrency in your backend systems, without forcing you to switch programming languages. What You Will Learn Master the Observer pattern and create Observable objects and sequences Convert lists of objects to Observable sequences Change existing methods to reactive asynchronous functions Filter Observable sequences to ensure that only the value you want will reach your functions Transform and manipulate Observable sequences into new sequences Combine, merge, and concatenate Observable sequences to create new sequences Move away from the Android main thread and AsyncTask to learn multithreading and concurrency the easy way with Schedulers Communicate with a remote REST API using Retrofit Observable responses Create your first RxJava-powered Android app In Detail RxJava Reactive Extensions for the JVM is a library for composing asynchronous and event-based programs using Observable sequences for the Java VM, which will help you beat Android platform limitations to create astonishing Android apps. Starting with some quick background information on the Rx .NET library, this book quickly moves on to your first example. You will understand Observables and learn to filter, transform, or merge them in detail. Next, you will learn how to get rid of Threads, AsyncTasks, and Handlers with Schedulers to create a smooth user experience. Develop an easy, ready-to-go approach to REST API communications and enrich your skills by working with new challenging examples. By the end of the

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RxJava Essentials

Table of Contents
RxJava Essentials

RxJava Essentials

Copyright 2015 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

First published: May 2015

Production reference: 1220515

Published by Packt Publishing Ltd.

Livery Place

35 Livery Street

Birmingham B3 2PB, UK.

ISBN 978-1-78439-910-8

www.packtpub.com

Credits

Author

Ivan Morgillo

Reviewer

David Moten

Commissioning Editor

Ashwin Nair

Acquisition Editor

Harsha Bharwani

Content Development Editor

Prachi Bisht

Technical Editor

Mrunal M. Chavan

Copy Editor

Stuti Srivastava

Project Coordinator

Sanjeet Rao

Proofreaders

Stephen Copestake

Safis Editing

Indexer

Priya Sane

Production Coordinator

Shantanu N. Zagade

Cover Work

Shantanu N. Zagade

About the Author

Ivan Morgillo was just a kid with a C64 and some basic skills before becoming an engineer a few years later. After working as an embedded systems consultant for Italtel and Telecom Italia, he moved to Android. He worked as a consultant for Deltatre, Mondia Media, and Clevertech.

He currently runs a mobile and embedded applications development company, Alter Ego Solutions, contributing to open source projects and still working on his Android projects over the weekend.

I want to thank Francesca, my beloved, for her constant support and infinite love; Sasa Sekulic, my company cofounder, for his perpetual trolling; and Fabrizio Chignoli, who changed my life, teaching me what reactive programming really is. This book is dedicated to my family and my friends. I couldn't have been where I am without their love.

About the Reviewer

David Moten has been programming in Java since 2001, largely with the Australian government. He learned Scala in 2007, which made him strongly appreciate the functional style, and he was delighted to discover RxJava when he went looking for functional libraries for Java in early 2014. He loves a bit of math when it turns up, and he is enjoying learning the tricks of the concurrent programming trade by contributing to the RxJava project on GitHub.

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Preface

In a world where there is a smartphone in every pocket, designing and building applications that can run smoothly and provide a user experience that users will enjoy is the only way to go. The reactive programming style with RxJava will help you beat Android Platform limitations to create astonishing Android Apps.

This book will be a practical journey, from the basics of reactive programming and Observer pattern concepts, to the main feature of RxJava, which will be accompanied by practical code examples and a real-world app.

I'll show you how to create an Observable from "scratch", from a list, or from a function that we already have in our codebase. You will learn how to filter an Observable sequence to create a new sequence, containing only the values we want; you will also learn how to apply a function to an Observable and how to concatenate, merge, or zip Observables. I'll show you how to enjoy RxAndroid Schedulers to overcome the threading and concurrency hell in Android.

The book will wind up with a practical example of RxJava combined with Retrofit to easily communicate with a REST API.

What this book covers

, RX from .NET to RxJava , takes initial steps into the reactive world. We will compare the reactive approach with the classic approach, and will explore the similarities and differences between them.

, Why Observables? , gives an overview of the Observer pattern, how it's implemented and extended by RxJava, what an Observable is, and how Observables relate to Iterables.

, Hello Reactive World , uses what we have learned so far to create our first reactive Android app.

, Filtering Observables , dives into the essence of an Observable sequence: filtering. We will also learn how to select only the values we want from an emitting Observable, how to obtain a finite number of values, how to handle overflow scenarios, and a few more useful tricks.

, Transforming Observables , shows how to transform Observable sequences to create sequences that can fit our needs.

, Combining Observables , digs into combining functions, and we are going to learn how to work with multiple Observables simultaneously when we create the Observable we want.

, Schedulers Defeating the Android MainThread Issue , shows you how to work with multithreading and concurrent programming using RxJava Schedulers. We will create network operations, memory accesses, and time-consuming tasks in a reactive way.

, REST in Peace RxJava and Retrofit , teaches you how Retrofit by Square can be used with RxJava to create an REST client efficiently and effectively.

What you need for this book

To run the examples in this book, you will need a standard Android development environment:

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