Anders Goransson - Efficient Android Threading: Asynchronous Processing Techniques for Android Applications
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Efficient Android Threading: Asynchronous Processing Techniques for Android Applications: summary, description and annotation
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Multithreading is essential if you want to create an Android app with a great user experience, but how do you know which techniques can help solve your problem? This practical book describes many asynchronous mechanisms available in the Android SDK, and provides guidelines for selecting the ones most appropriate for the app youre building.
Author Anders Goransson demonstrates the advantages and disadvantages of each technique, with sample code and detailed explanations for using it efficiently. The first part of the book describes the building blocks of asynchronous processing, and the second part covers Android libraries and constructs for developing fast, responsive, and well-structured apps.
- Understand multithreading basics in Java and on the Android platform
- Learn how threads communicate within and between processes
- Use strategies to reduce the risk of memory leaks
- Manage the lifecycle of a basic thread
- Run tasks sequentially in the background with HandlerThread
- Use Javas Executor Framework to control or cancel threads
- Handle background task execution with AsyncTask and IntentService
- Access content providers with AsyncQueryHandler
- Use loaders to update the UI with new data
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To Anna, Fabian, and Ida.
Efficient Android Threading explores how to achieve robust and reliable multithreaded Android applications. Well look at the asynchronous mechanisms that are available in the Android SDK and determine appropriate implementations to achieve fast, responsive, and well-structured applications.
Lets face it: multithreading is required to create applications with a great user experience, but it also increases the complexity of the application and the likelihood of runtime errors. The complexity partly comes from the built-in difficulty of execution on multiple threads and from applications that arent utilizing the Android platform efficiently.
This book aims to guide application developers to selecting an asynchronous mechanism based on an understanding of its advantages and difficulties. By using the right asynchronous mechanism at the right time, much of the complexity is transferred from the application to the platform, making the application code more maintainable and less error prone. As a rule of thumb, asynchronous execution should not induce more complexity to the code than necessary, which is achieved through a wise choice from the palette of asynchronous mechanisms in Android.
Although a high-level asynchronous mechanism can be very convenient to use, it still needs to be understoodnot only usedor the application may suffer from equally difficult runtime errors, performance degradation, or memory leaks. Therefore, this book not only contains practical guidelines and examples, but also explores the underlying enablers for asynchronous execution on Android.
This book is for Java programmers who have learned the basics ofAndroid programming. The book introduces techniques that arefundamental to writing robust and responsive applications, usingstandard Android libraries.
This book contains two main parts: . The first part describes the foundation for threads on Androidi.e., Java, Linux, Handlersand its impact on the application. The second part is more hands-on, looking into the asynchronous mechanisms that an application has at its disposal.
correctly.
covers the higher-level libraries andconstructs in Android that make programming with threads safer andeasier.
java.lang.Thread, and how to handle the various states and problems that can occur.Shows a convenient way to run tasks sequentially in the background.Offers techniques for dealing with scheduling, errors, and other aspects of thread handling, such as thread pools.Covers the AsyncTaskprobably the most popular asynchronous techniqueand how to use it correctly to avoid its pitfalls.Covers the essential Service component, which is useful for functionality that you want to offer to multiple applications or to keep the application alive during background execution.Builds on the previous chapter with a discussion of a useful technique for executing off the main UI thread.A high-level mechanism that simplifies fast asynchronous access to content providers.Discover how the UI can be updated with loaders, where new data is delivered asynchronously whenever the content changes.Given all the techniques described throughout this book, how do you choose the right one for your app? This chapter offers guidelines for making this choice.The following typographical conventions are used in this book:
Constant width Indicates variables, functions, types, objects, and other programming constructs.Constant width italic Indicates place-holders in code orcommands that should be replaced by appropriate values.This element signifies a tip, suggestion, or a general note.
This element indicates a trap or pitfall to watch out for, typicallysomething that isnt immediately obvious.
Supplemental material (code examples, exercises, etc.) is available for download at https://github.com/andersgoransson/eatbookexamples.
This book is here to help you get your job done. In general, you may use the code in this book in your programs and documentation. You do not need to contact us for permission unless you are reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.
We appreciate attribution. An attribution usually includes the title, author, publisher, and ISBN.
If you believe that your use of code examples falls outside of fair use or the permission given above, feel free to contact us at .
Examples will be maintained at: :andersgoransson/eatbookexamples.git
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We have a web page for this book, where we list errata, examples, and any additional information. You can access this page at http://bit.ly/efficient-android-threading.
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