MessageQueue is a simply queue that has tasks called messages which should be processed.The thread is terminated when it is done with execution of all the tasks.Īndroid framework also uses the model via Looper, Handler and HandlerThread in the following way:.The task is executed serially by that thread and is maintained in the queue ( Message Queue).The thread is kept alive in the loop by its run() method.
So the best solution would be to create reasonable amount of threads and use them for all the tasks. One may wonder we can do improvements by dispatching tasks among multiple of execution threads, however, it is also very slow because creation of multiple threads is overhead. The problem with Java thread is they are one time use only, and die after executing its run method. Question may appear "why on earth we need to worry about loopers, and handlers when java already provides us with thread APIs for multi-threading programming"? It is actually very good question. So understanding loopers and handlers will help to understand those third parties libraries.
Android studio handler android#
Android main UI thread is built with looper and handlers, so understanding them is important to create unblocked responsive UI.Before diving deep into details of loopers and handlers, let me clarify a few points how are implemented in android framework. They are very neat and clean structure on which whole android framework built upon. Multi-threading, and task running are the old subjects, java facilitated them with fork / join frameworks, several libraries have been written to facilitate asynchronous operations including RxJava for reactive programming and managing asynchronous operations.Īndroid has also developed its own way of managing asynchronous operations by Looper and Handlers. Another reason for that limited use is that android already provided better simpler frameworks for management of multi-threading such as ThreadPoolExecuter, IntentService, and AsyncTask.
Android studio handler update#
Most of android developers use them in a very limited context, mostly update UI from another background thread. Looper, handler and thread are one of the most important building blocks of Android OS.
I have posted this article for those who don't have any idea how multi-threading architecture in android works, and want to learn about them in depth.
0 kommentar(er)
