By Helder Vasconcelos
About This Book
- Construct scalable and performant purposes to exploit multi-thread asynchronous techniques
- Explore the high-level Android asynchronous constructs on hand at the Android SDK
- Choose the main applicable asynchronous strategy to enforce your subsequent amazing feature
Who This e-book Is For
This ebook is for Android builders who are looking to the best way to construct multithreaded and trustworthy Android functions utilizing high-level and complicated asynchronous thoughts and concepts.
What you'll Learn
- Get conversant in the Android technique version and low-level concurrent and multithread constructs to be had at the Android SDK
- Use AsyncTask to load facts within the heritage, supplying development ends up in the meantime
- Enhance UI functionality and responsiveness by way of sending paintings to a provider working within the background
- Defer, agenda, and batch paintings at the Android process with no 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 acquainted with using the Android Loader build to bring updated results
Asynchronous programming has got significant significance in Android programming, specially once we intend to make use of the variety of self sufficient processing devices (cores) to be had at the newest Android units. to begin with, we are going to talk about the main points of the Android procedure version and the Java low-level concurrent framework, added through the Android SDK. subsequent, we'll speak about the construction of IntentServices, certain providers, and exterior companies, that may run within the historical past even if the person isn't really interacting with them. In a extra complicated part, you'll create heritage initiatives which are capable of execute CPU-intensive projects in local code–making use of the Android NDK.
You can be then guided throughout the technique 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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Extra info for Asynchronous Android Programming
Concurrent software faces many issues that fall into two broad categories: correctness (producing consistent and correct results) and liveness (making progress towards completion). Thread creation could also cause some performance overhead, and too many threads can reduce the performance, as the OS will have switch between these lines of execution. Correctness issues in concurrent programs A common example of a correctness problem occurs when two threads need to modify the value of the same variable based on its current value.
After the ExecutorService instance creation, new Runnable tasks are posted for asynchronous processing. When a new unit of work is submitted, a thread that is free to work is chosen to handle the task; but when all the threads are occupied, Runnable will wait in a local queue until a thread is ready to work. ContentProvider The Activity, Service, and BroadcastReceiver are activated explicitly or implicitly over an asynchronous message called Intent. Each of these building blocks have their own life cycle, so they could be exposed to different concurrency issues if an asynchronous architecture is used to offload work from the main thread.
When all strong references are garbage-collected, our WeakReference will also lose its reference to the View, get() will return null, and the View will be garbage-collected. This fixes the resource leakage problem, but we must always check for null before using the returned object in order to avoid potential NullPointerException instances. If we're sending messages to our Handler and expecting it to update the user interface, it will also need a reference to the view hierarchy. detach(); } [ 44 ] Chapter 2 Updating the UI with Handler Since we instantiated our handler in the main thread, all work submitted to it executes on the main thread.
Asynchronous Android Programming by Helder Vasconcelos