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Android MessageQueue


Android MessageQueue

By : Tenshin
Date : November 19 2020, 01:01 AM
this one helps. It's not the same MessageQueue, when you call Looper.loop() in a new thread, a new MessageQueue will attache to the new created thread. Then we usually use Handler to communicate with the thread. The main UI thread's MessageQueue is created by system when you app start. You can compare the message queues by their reference.
code :
private static final String TAG = MainActivity.class.getSimpleName();
private Handler mHandler;
private MessageQueue messageQueue;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    messageQueue = Looper.myQueue();
    new Thread() {

        @Override
        public void run() {
            super.run();
            Looper.prepare();
            mHandler = new Handler() {
                @Override
                public void handleMessage(Message msg) {
                    super.handleMessage(msg);
                    if (Looper.myQueue().equals(messageQueue)) {
                        Log.d(TAG, "same message queue");
                    } else {
                        Log.d(TAG, "not the same queue");
                    }
                }
            };
            mHandler.sendEmptyMessage(0);
            Looper.loop();
        }
    }.start();
}


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C# - Throttling a MessageQueue

C# - Throttling a MessageQueue


By : Amjad Ahmad
Date : March 29 2020, 07:55 AM
will help you Short answer: Do the simple thing and don't limit on send.
Long answer: The message queue will only really get full when the disk it's allocated to save to is out of space - which is the same time that your logging will be out of space. The message queue is very good at holding data you're not ready to process. Don't throttle on send. If you're concerned about system management and disk space then you might prefer to rely on Window's excellent system monitoring facilities and disk space usage threshold alerts. You don't need to reinvent this for your application.
What is the relationship between Looper, Handler and MessageQueue in Android?

What is the relationship between Looper, Handler and MessageQueue in Android?


By : Webservice
Date : March 29 2020, 07:55 AM
around this issue A Looper is a message handling loop: it reads and processes items from a MessageQueue. The Looper class is usually used in conjunction with a HandlerThread (a subclass of Thread).
A Handler is a utility class that facilitates interacting with a Looper—mainly by posting messages and Runnable objects to the thread's MessageQueue. When a Handler is created, it is bound to a specific Looper (and associated thread and message queue).
Android- How defer main MessageQueue events during custom GLSurfaceView.Renderer.onDrawFrame(GL10 gl)?

Android- How defer main MessageQueue events during custom GLSurfaceView.Renderer.onDrawFrame(GL10 gl)?


By : myeie
Date : March 29 2020, 07:55 AM
wish helps you Situation: Android , The final piece to my solution to "Q 3":
code :
public class MainActivity ...

    // Call this, if not already on UI thread.
    public static void processQueuedEventsOnUIThread() {
        try {
             Runnable runnable = new Runnable() {
                @Override
                public void run() {
                    ... process the deferred UI events, which I have stored on a private queue ...
                }
            };
            MainActivity.mMainActivity.runOnUiThread(runnable);
        } catch (Exception e) {
            Log.e("MainActivity", "processQueuedEventsOnUIThread", e);
        }
    }
MainActivity.processQueuedEventsOnUIThread();
Android MessageQueue max size

Android MessageQueue max size


By : Mangesh Bhagat
Date : March 29 2020, 07:55 AM
Does that help Does Android MessageQueue, the one that Handler post to, is limited in size ? , There is no limit, but application can crash with OutOfMemoryError.
In android's use Messenger between process, is MessageQueue not used?

In android's use Messenger between process, is MessageQueue not used?


By : Sam Sun
Date : March 29 2020, 07:55 AM
hop of those help? You create Handlers within Activities, Services and other such components that extend Context. The handlers use Context.getMainLooper() and that Looper has its message queue Looper.getQueue() You can not create a Handler from something which doesn't have a Looper, there will be a runtime exception.
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