Download Asynchronous Android by Steve Liles PDF

By Steve Liles

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

Overview

  • Learn find out how to use Android's high-level concurrency constructs to maintain your functions tender and responsive
  • Leverage the entire energy 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

In Detail

With greater than 1000000 apps to be had from Google Play, it's extra vital than ever to construct apps that stand proud of the gang. to achieve success, apps needs to react speedy to consumer enter, carry ends up in a flash, and sync facts within the history. the most important to this can be knowing how you can enforce asynchronous operations that paintings with the platform, rather than opposed to it. Asynchronous Android is a realistic publication that courses you thru the concurrency constructs supplied by way of the Android platform, illustrating the functions, advantages, and pitfalls of each.

Learn to exploit AsyncTask appropriately to accomplish operations within the historical past, maintaining user-interfaces working easily whereas heading off treacherous reminiscence leaks. observe Handler, HandlerThread and Looper, the similar and primary construction blocks of asynchronous programming in Android. break out from the restrictions of the task lifecycle to load and cache facts successfully throughout your whole program with the Loader framework. continue your information clean with scheduled initiatives, and know how companies enable your program proceed to run within the heritage, even if the person is busy with anything else.

Asynchronous Android might help you to construct well-behaved apps with delicate, responsive user-interfaces that pride clients with quickly effects and knowledge that’s constantly clean, and retain the procedure chuffed and the battery charged by way of enjoying through the rules.

What you are going to research from this book

  • Understand Android's method version and its implications in your applications
  • Exercise multithreading to construct well-behaved Android purposes that paintings with the platform
  • Apply and keep watch over concurrency to carry effects speedy and maintain your purposes conscious of consumer input
  • Discover Android-specific constructs that make asynchronous programming effortless and efficient
  • Learn easy methods to practice Android's concurrency constructs to construct delicate and responsive applications

Approach

Asynchronous Android is a step by step consultant that builds a whole photo of the concurrency constructs to be had at the Android platform.

Who this booklet is written for

This publication is for Android builders who are looking to find out about the complicated suggestions of Android programming. No past wisdom of concurrency and asynchronous programming is needed. This e-book is additionally distinctive in the direction of Java specialists who're new to Android.

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Asynchronous Android

Harness the ability of multi-core cellular processors to construct responsive Android purposes review find out how to use Android's high-level concurrency constructs to maintain your purposes gentle and responsive Leverage the entire 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 on hand mechanisms of asynchronous programming intimately intimately With greater than 1000000 apps on hand from Google Play, it really is extra very important than ever to construct apps that stick out from the group.

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Additional info for Asynchronous Android

Sample text

Chapter 2 This pattern of passing data from one thread to another is very important, because it helps us to avoid several thread-safety issues. Our AsyncTask could manipulate fields of the enclosing Activity class, but then we would have to take extra precautions, such as adding synchronization to prevent race conditions and ensure visibility of updates. MAIN BACKGROUND onPreExecute publishProgress onProgressUpdate onProgressUpdate onProgressUpdate onProgressUpdate publishProgress publishProgress doInBackground publishProgress publishProgress onProgressUpdate onPostExecute The preceding figure displays a sequence of method calls executed by AsyncTask, illustrating which methods run on the main thread versus the AsyncTask background thread.

Instead, we have the opportunity to implement different behavior for a cancelled execution by implementing onCancelled. There are two variants of this callback method: protected void onCancelled(Result result); protected void onCancelled(); The default implementation of the parameterized onCancelled(Result result) method delegates to the onCancelled method. [ 24 ] Chapter 2 If AsyncTask can provide either a complete result (such as a fully downloaded image) or nothing, then we will probably want to override the zero argument onCancelled() method.

Alternatively, we can turn the approach on its head by sending Messages to a Handler, and defining the Handler to react appropriately to different Messages. [ 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.

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