Asynchronous Android by Steve Liles PDF

By Steve Liles

ISBN-10: 1783286873

ISBN-13: 9781783286874

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

Overview

  • Learn the best way to use Android's high-level concurrency constructs to maintain your purposes tender and responsive
  • Leverage the total strength of multi-core cellular CPUs to get extra paintings performed in much less time
  • From quickly calculations to scheduled downloads, each one bankruptcy explains the on hand mechanisms of asynchronous programming in detail

In Detail

With greater than 1000000 apps on hand 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 leads to a flash, and sync information within the history. the major to this is often knowing how you can enforce asynchronous operations that paintings with the platform, rather than opposed to it. Asynchronous Android is a realistic ebook that courses you thru the concurrency constructs supplied by means of the Android platform, illustrating the functions, merits, and pitfalls of each.

Learn to take advantage of AsyncTask competently to accomplish operations within the historical past, protecting user-interfaces working easily whereas warding off treacherous reminiscence leaks. realize Handler, HandlerThread and Looper, the similar and basic construction blocks of asynchronous programming in Android. break out from the restrictions of the job lifecycle to load and cache facts successfully throughout all of your program with the Loader framework. retain your facts clean with scheduled projects, and know the way companies permit your program proceed to run within the historical past, even if the consumer is busy with anything else.

Asynchronous Android can help you to construct well-behaved apps with soft, responsive user-interfaces that pride clients with quickly effects and knowledge that’s continuously clean, and hold the procedure chuffed and the battery charged by way of taking part in through the rules.

What you are going to examine from this book

  • Understand Android's approach version and its implications in your applications
  • Exercise multithreading to construct well-behaved Android purposes that paintings with the platform
  • Apply and keep an eye on concurrency to carry effects speedy and preserve your purposes conscious of person input
  • Discover Android-specific constructs that make asynchronous programming effortless and efficient
  • Learn how you can observe Android's concurrency constructs to construct delicate and responsive applications

Approach

Asynchronous Android is a step by step consultant that builds an entire photograph of the concurrency constructs to be had at the Android platform.

Who this ebook is written for

This booklet is for Android builders who are looking to know about the complicated recommendations of Android programming. No previous wisdom of concurrency and asynchronous programming is needed. This publication can be special in the direction of Java specialists who're new to Android.

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Additional info for Asynchronous Android

Example text

Notice that we're being careful to publish progress only when the percentage actually changes, avoiding any unnecessary overhead. The delay between publishing the progress and seeing the user interface update will be extremely short, and the progress bar will update smoothly, provided we are careful to follow the golden rule of not blocking the main thread from any of our code. Canceling AsyncTask Another nice usability touch we can provide for our users is the ability to cancel a task before it completes—for example, if the task depends on some user input and, after starting the execution, the user realizes that they have provided the wrong value.

To demonstrate this, we'll start by defining an interface that our Activity will implement: public void void void void } interface AsyncListener { onPreExecute(); onProgressUpdate(Progress... progress); onPostExecute(Result result); onCancelled(Result result); Next, we'll create a retained headless Fragment, which wraps our AsyncTask. For brevity, doInBackground is omitted, as it is unchanged from the previous examples—see the downloadable samples for the complete code. onPreExecute(); } protected void onProgressUpdate(Integer...

42 ] Chapter 3 Taking a simple example, let's say we want our Handler to display hello or goodbye, depending on what type of Message it receives. To do that, we'll extend Handler and override its handleMessage method. handleMessage(msg); } } private void sayWord(String word) { … } } Here we've implemented the handleMessage method to expect messages with two different what values and react accordingly. If you look carefully at the Speak Handler class example explained earlier, you'll notice that we defined it as a static class.

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Asynchronous Android by Steve Liles


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