CODEWITHSUNDEEP
androidmultithreadingcommunication
user140888
user140888

Reputation: 609

Communication between worker threads

I am programming in Android environment, and I have in my project a Main Activity, in which there is an AsynkTask class, and separately a Thread object, realized extending Runnable interface. Now, AsynkTask and the Thread can be seen as two worker threads managed by the main thread, that is the Main Activity. How can I do if I want to make possible the communication between the two worker threads, not involving the main thread? How can I use handlers to realize this? I know how to use handlers between main and worker threads. I want to know how use them only between the worker threads, because in this case I can't pass in constructors handlers, because in this case I can not directly instantiate a thread, passing it as a parameter the handler created by the main thread. The main thread must create two worker threads, and they must communicate without the involvement of the main thread. I hope I have been clear enough.

Upvotes: 3

Views: 2524

Answers (1)

Alexander
Alexander

Reputation: 48262

If you want to use a Handler with a worker thread you have to create a Looper on that Thread as explained in http://developer.android.com/reference/android/os/Looper.html.

Like this:

 class LooperThread extends Thread {
      public Handler mHandler;

      public void run() {
          Looper.prepare();

          mHandler = new Handler() {
              public void handleMessage(Message msg) {
                  // process incoming messages here
              }
          };

          Looper.loop();
      }
  }

And then you can send messages to mHandler from any other Thread.

Upvotes: 2

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