[PDF] Android UIThread, Thread, Handler et AsyncTask - JFOD

  • What is the difference between thread handler and AsyncTask in Android?

    Using Handlers you have the advantage of MessagingQueues , so if you want to schedule messages or update multiple UI elements or have repeating tasks. AsyncTask are similar, in fact, they make use of Handler , but doesn't run in the UI thread, so it's good for fetching data, for instance fetching web services.

  • How to use handler thread in Android?

    Handler handler = new Handler(looper); As I mentioned earlier, we create a new HandlerThread and give it any name. We then start the HandlerThread, get the Looper for the HandlerThread and pass it to a handler. Then, in order to use it, you simply have to post Runnable to the Handler thread.

  • What is the difference between thread and HandlerThread in Android?

    A handler allows you to send and process Message and Runnable objects associated with a thread's MessageQueue. Each handler instance is associated with a single thread and that thread's message queue. This class is responsible for enqueuing any task to the message queue and processing it.
  • In this case, to update the UI from a background thread, you can create a handler attached to the UI thread, and then post an action as a Runnable : Handler handler = new Handler(Looper. getMainLooper()); handler. post(new Runnable() { @Override public void run() { // update the ui from here } });
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