Asynchronous Android, 1st Edition by Steve Liles

By Steve Liles

Harness the facility of multi-core cellular processors to construct responsive Android applications

Overview

  • Learn easy methods to use Android's high-level concurrency constructs to maintain your purposes tender and responsive
  • Leverage the whole energy of multi-core cellular CPUs to get extra paintings performed in much less time
  • From speedy calculations to scheduled downloads, each one bankruptcy explains the to be had mechanisms of asynchronous programming in detail

In Detail

With greater than one million apps to be had from Google Play, it truly is extra very important than ever to construct apps that stick out from the gang. to achieve success, apps needs to react fast to consumer enter, convey ends up in a flash, and sync information within the history. the most important to this is often knowing tips on how to enforce asynchronous operations that paintings with the platform, rather than opposed to it. Asynchronous Android is a pragmatic booklet that publications you thru the concurrency constructs supplied through the Android platform, illustrating the purposes, merits, and pitfalls of each.

Learn to exploit AsyncTask adequately to accomplish operations within the historical past, conserving user-interfaces operating easily whereas fending off treacherous reminiscence leaks. realize Handler, HandlerThread and Looper, the similar and primary development blocks of asynchronous programming in Android. get away from the limitations of the job lifecycle to load and cache info successfully throughout all your software with the Loader framework. hold your facts clean with scheduled initiatives, and know the way prone enable your program proceed to run within the history, even if the person is busy with whatever else.

Asynchronous Android can help you to construct well-behaved apps with tender, responsive user-interfaces that satisfaction clients with quick effects and knowledge that’s consistently clean, and retain the approach chuffed and the battery charged by means of enjoying by way of the rules.

What you are going to study from this book

  • Understand Android's approach version and its implications in your applications
  • Exercise multithreading to construct well-behaved Android functions that paintings with the platform
  • Apply and regulate concurrency to carry effects speedy and hold your purposes conscious of person input
  • Discover Android-specific constructs that make asynchronous programming effortless and efficient
  • Learn the way to follow Android's concurrency constructs to construct gentle and responsive applications

Approach

Asynchronous Android is a step by step advisor that builds an entire photograph of the concurrency constructs on hand at the Android platform.

Who this publication is written for

This booklet is for Android builders who are looking to find out about the complex thoughts of Android programming. No previous wisdom of concurrency and asynchronous programming is needed. This booklet can be specific in the direction of Java specialists who're new to Android.

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Extra info for Asynchronous Android, 1st Edition

Example text

SAY_WORD); Note that just as with posted Runnables, Message cancellation only removes pending operations from the queue—it does not attempt to stop an operation which is already being executed. Composition versus Inheritance So far we subclassed Handler to override its handleMessage method, but that isn't our only option. Callback during Handler construction. obj); break; default: [ 45 ] Distributing Work with Handler and HandlerThread return false; } return true; } private void sayWord(String word) { … } } Notice that the signature of handleMessage is slightly different here—we must return a boolean indicating whether or not the Message was handled.

Cancel(false); } If the Activity is not finishing—say because it has started another Activity and is still on the back stack—we might simply allow our background task to continue to completion. Handling lifecycle issues with retained headless fragments If the Activity is finishing because of a configuration change, it may still be useful to complete the background task and display the results in the restarted Activity. One pattern for achieving this is through the use of retained Fragments. Fragments were introduced to Android at API level 11, but are available through a support library to applications targeting earlier API levels.

SERIAL_EXECUTOR, params); Besides the default executors provided by AsyncTask, we can choose to create our own. For example, we might want to allow some concurrency by operating off a small pool of threads, and allow many tasks to be queued if all threads are currently busy. This is easily achieved by configuring our own instance of ThreadPoolExecutor as a static member of one of our own classes—for example, our Activity class. MINUTES, QUEUE); The parameters to the constructor indicate the core pool size (4), the maximum pool size (8), the time for which idle additional threads may live in the pool before being removed (1), the unit of time (minutes), and the queue to use when the pool threads are busy.

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