How to create a Looper thread, then send it a message immediately?

Question

I have a worker thread that sits in the background, processing messages. Something like this:

class Worker extends Thread {

    public volatile Handler hand         


        

Answer 1

This is my solutions: MainActivity:

//Other Code

 mCountDownLatch = new CountDownLatch(1);
        mainApp = this;
        WorkerThread workerThread = new WorkerThread(mCountDownLatch);
        workerThread.start();
        try {
            mCountDownLatch.await();
            Log.i("MsgToWorkerThread", "Worker Thread is up and running. We can send message to it now...");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        Toast.makeText(this, "Trial run...", Toast.LENGTH_LONG).show();
        Message msg = workerThread.workerThreadHandler.obtainMessage();
        workerThread.workerThreadHandler.sendMessage(msg);

The WorkerThread Class:

public class WorkerThread extends Thread{

    public Handler workerThreadHandler;
    CountDownLatch mLatch;

    public WorkerThread(CountDownLatch latch){

        mLatch = latch;
    }


    public void run() {
        Looper.prepare();
        workerThreadHandler = new Handler() {
            @Override
            public void handleMessage(Message msg) {

                Log.i("MsgToWorkerThread", "Message received from UI thread...");
                        MainActivity.getMainApp().runOnUiThread(new Runnable() {

                            @Override
                            public void run() {
                                Toast.makeText(MainActivity.getMainApp().getApplicationContext(), "Message received in worker thread from UI thread", Toast.LENGTH_LONG).show();
                                //Log.i("MsgToWorkerThread", "Message received from UI thread...");
                            }
                        });

            }

        };
        Log.i("MsgToWorkerThread", "Worker thread ready...");
        mLatch.countDown();
        Looper.loop();
    }
}