By Steve Liles
Harness the ability of multi-core cellular processors to construct responsive Android applications
- Learn how you can use Android's high-level concurrency constructs to maintain your purposes tender and responsive
- Leverage the complete strength of multi-core cellular CPUs to get extra paintings performed in much less time
- From fast calculations to scheduled downloads, every one bankruptcy explains the to be had mechanisms of asynchronous programming in detail
With greater than one million apps to be had from Google Play, it really is extra very important than ever to construct apps that stand proud of the group. to achieve success, apps needs to react fast to person enter, convey ends up in a flash, and sync facts within the historical past. the foremost to this is often realizing easy methods to 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 through the Android platform, illustrating the purposes, merits, and pitfalls of each.
Learn to take advantage of AsyncTask appropriately to accomplish operations within the heritage, conserving user-interfaces working easily whereas heading off treacherous reminiscence leaks. become aware of Handler, HandlerThread and Looper, the similar and basic development blocks of asynchronous programming in Android. break out from the restrictions of the task lifecycle to load and cache info successfully throughout your whole program with the Loader framework. retain your facts clean with scheduled initiatives, and know the way companies enable your program proceed to run within the heritage, even if the consumer is busy with whatever else.
Asynchronous Android can assist you to construct well-behaved apps with delicate, responsive user-interfaces that satisfaction clients with quick effects and information that’s continually clean, and preserve the procedure chuffed and the battery charged by way of enjoying through the rules.
What you are going to study from this book
- Understand Android's procedure version and its implications in your applications
- Exercise multithreading to construct well-behaved Android functions that paintings with the platform
- Apply and keep watch over concurrency to carry effects fast and hold your purposes aware of person input
- Discover Android-specific constructs that make asynchronous programming effortless and efficient
- Learn the right way to observe Android's concurrency constructs to construct gentle and responsive applications
Asynchronous Android is a step by step advisor that builds a whole photo of the concurrency constructs on hand at the Android platform.
Who this booklet is written for
This publication is for Android builders who are looking to know about the complex suggestions of Android programming. No past wisdom of concurrency and asynchronous programming is needed. This booklet is usually distinctive in the direction of Java specialists who're new to Android.
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Extra resources for Asynchronous Android
Execute(500); } }); [ 21 ] Staying Responsive with AsyncTask Providing progress updates Knowing that something is happening is a great relief to our users, but they might be getting impatient and wondering how much longer they need to wait. Let's show them how we're getting on by adding a progress bar to our dialog. Remember that we aren't allowed to update the user interface directly from doInBackground, because we aren't on the main thread. How, then, can we tell the main thread to make these updates for us?
DispatchMessage handler. java:4898) That's right! Everything that happens in an Activity lifecycle callback method is running in a dispatchMessage call invoked by the main Looper! The interesting thing to realize here is that we can send messages to the main thread from any other thread (or even from the main thread itself) and in doing so, hand over work from background threads to the main thread—for example, to have it update the user interface with the results of background processing. Building responsive apps with Handler The Handler class is fundamental to the infrastructure of Android apps—together with Looper.
What is perhaps less well known are the mechanics of how AsyncTask coordinates work between background threads and the main thread. In this chapter we'll meet some of the lower-level constructs that AsyncTask builds on to get its work done. We'll see how to defer tasks to happen in the future on the main thread, whether that is as soon as possible, after a specified delay, or at a specified time, and we'll apply the same concepts to scheduling work on background threads and coordinating the results with the main thread.
Asynchronous Android by Steve Liles