Asynchronous Android Programming by Helder Vasconcelos

By Helder Vasconcelos

About This Book

  • Construct scalable and performant functions to use multi-thread asynchronous techniques
  • Explore the high-level Android asynchronous constructs to be had at the Android SDK
  • Choose the main applicable asynchronous strategy to enforce your subsequent awesome feature

Who This ebook Is For

This publication is for Android builders who are looking to methods to construct multithreaded and trustworthy Android purposes utilizing high-level and complex asynchronous ideas and concepts.

What you'll Learn

  • Get accustomed to the Android approach version and low-level concurrent and multithread constructs to be had at the Android SDK
  • Use AsyncTask to load info within the historical past, providing growth ends up in the meantime
  • Enhance UI functionality and responsiveness by way of sending paintings to a carrier operating within the background
  • Defer, time table, and batch paintings at the Android process with out compromising the battery lifestyles and person experience
  • Use the JNI interface to execute concurrent paintings on local layer
  • Pull and push information out of your community servers utilizing the Google GCM platform
  • Create and compose initiatives with RxJava to execute complicated asynchronous paintings in a predictable way
  • Get conversant in using the Android Loader build to carry up to date results

In Detail

Asynchronous programming has bought substantial significance in Android programming, in particular once we have the desire to make use of the variety of self reliant processing devices (cores) to be had at the most up-to-date Android units. to begin with, we'll speak about the main points of the Android technique version and the Java low-level concurrent framework, introduced by way of the Android SDK. subsequent, we are going to talk about the construction of IntentServices, certain companies, and exterior companies, which may run within the heritage even if the person isn't interacting with them. In a extra complicated part, you'll create heritage projects which are capable of execute CPU-intensive initiatives in local code–making use of the Android NDK.

You could be then guided in the course of the strategy of interacting with distant companies asynchronously utilizing the HTTP protocol or Google GCM Platform. ultimately, we'll introduce RxJava, a favored asynchronous Java framework used to compose paintings in a concise and reactive way.

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Additional info for Asynchronous Android Programming

Example text

Following this definition, Android's Looper executes on a thread that has a MessageQueue, executes a continuous loop waiting for work, and blocks when there is no work pending. When work is submitted to its queue, it dispatches it to the target Handler defined explicitly on the Message object. A message is a notification object containing a description and arbitrary data object that can be sent to a Handler. The Looper on Android is an implementation of a common UI programming concept known as an event loop.

If the activity finishes before the 10 minutes are up, it cannot yet be garbage-collected because the implicit reference in our runnable means that the activity is still reachable by live objects. So, although it makes for a concise example, it is not a good idea in practice to post non-static Runnables onto the main thread's Handler queue (especially with postDelayed or postAtTime) unless we're very careful to clean up after ourselves all the references to the inactive Activities. If the MyActivity object is not garbage-collected in 10 minutes, a memory leak with all the activity views and resources will increase your memory consumption until you reach the maximum heap space per application available.

The prepare() method is responsible for initializing the MessageQueue and attaching the queue as a ThreadLocal parameter to the current thread. When loop() is invoked, the run() method will block until the looper is interrupted to process new messages be added to the queue. prepare() must only be called once from within the same thread; otherwise, a RuntimeException will to be thrown that says only one looper may be created per thread. When we want to stop the continuous Looper execution, we can either invoke its member function quit() to stop it without processing the remaining messages in its queue or quitSafely() to process the remaining work on the queue and stop.

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