Asynchronous Android by Steve Liles

By Steve Liles

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

Overview

  • Learn how one can use Android's high-level concurrency constructs to maintain your purposes delicate and responsive
  • Leverage the total energy of multi-core cellular CPUs to get extra paintings performed in much less time
  • From fast 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 on hand from Google Play, it really is extra vital than ever to construct apps that stand proud of the group. to achieve success, apps needs to react speedy to person enter, carry leads to a flash, and sync facts within the history. the major to this can be knowing easy methods to enforce asynchronous operations that paintings with the platform, rather than opposed to it. Asynchronous Android is a realistic e-book that courses you thru the concurrency constructs supplied by means of the Android platform, illustrating the purposes, advantages, and pitfalls of each.

Learn to take advantage of AsyncTask adequately to accomplish operations within the history, preserving user-interfaces working easily whereas warding off treacherous reminiscence leaks. notice Handler, HandlerThread and Looper, the similar and basic construction blocks of asynchronous programming in Android. get away from the limitations of the task lifecycle to load and cache facts successfully throughout your whole software with the Loader framework. hold your information clean with scheduled projects, and know how companies allow your software proceed to run within the heritage, 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 fast effects and knowledge that’s consistently clean, and hold the approach satisfied and the battery charged by means of enjoying by means of the rules.

What you'll study from this book

  • Understand Android's strategy 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 bring effects fast and maintain your functions aware 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 tender 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 e-book is for Android builders who are looking to find out about the complicated thoughts of Android programming. No past wisdom of concurrency and asynchronous programming is needed. This booklet is usually designated in the direction of Java specialists who're new to Android.

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Additional resources for Asynchronous Android

Example text

Activity lifecycle issues Having deliberately moved any long-running tasks off the main thread, we've made our applications nice and responsive—the main thread is free to respond very quickly to any user interaction. Unfortunately, we have also created a potential problem for ourselves, because the main thread is able to finish the Activity before our background tasks complete. Activity might finish for many reasons, including configuration changes caused the by the user rotating the device (the default behavior of Activity on a change in orientation is to restart with an entirely new instance of the activity).

However, we can explicitly prevent this by invoking setRetainInstance(true) on our Fragment so that it survives across Activity restarts. Typically, a Fragment will be responsible for creating and managing at least a portion of the user interface of an Activity, but this is not mandatory. A Fragment that does not manage a view of its own is known as a headless Fragment. Isolating our AsyncTask in a retained headless Fragment makes it less likely that we will accidentally leak references to objects such as the View hierarchy, because the AsyncTask will no longer directly interact with the user interface.

However, we can explicitly prevent this by invoking setRetainInstance(true) on our Fragment so that it survives across Activity restarts. Typically, a Fragment will be responsible for creating and managing at least a portion of the user interface of an Activity, but this is not mandatory. A Fragment that does not manage a view of its own is known as a headless Fragment. Isolating our AsyncTask in a retained headless Fragment makes it less likely that we will accidentally leak references to objects such as the View hierarchy, because the AsyncTask will no longer directly interact with the user interface.

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