android - Update TextView during long Thread process

itemprop="text">

Just to be clear, this
question is not about how to update a TextView from a Thread,
that's working fine. The problem is that even if I make multiple calls to update the
TextView throughout the Thread, the updates only appear after the Thread is done it's
work. Here's an example:

public class NDThread
            extends Thread {

 protected LogActionListener
            log_listener;
 private Handler handler = new
            Handler();


 public void run() {

            logAction("starting");

 // Do many things..

            logAction("halfway");
 // Many more things..

            logAction("done");
 }

 public interface LogActionListener
            {
 public void onLogAction(String paramString);

            }


 public void logAction(final String str) {

            if(log_listener != null) handler.post(new Runnable() {
 @Override

            public void run() {
 log_listener.onLogAction(str); 
 } 

            });

            }
}

And in my
main Activity, I implement LogActionListener to recieve the
Strings and update the TextView:

NDThread
            thread = new
            NDThread();
thread.setOnLogActionListener(this);
thread.run();

//
            Elsewhere..
@Override
public void onLogAction(final String msg)
            {

 handler.post(new Runnable() {


            @Override
 public void run() {
 textView.append(msg);

            }


            });
}

As you
can see, I've used Handlers in both the Thread and the Activity
because I wasn't really sure which was correct to use. However, the result is always a
blank TextView for the entirety of the Thread, then at the end it will print the 3
lines. What am I doing wrong?

itemprop="text">

class="normal">Answer

Avoid
Thread and Go For
AsyncTask

What you are
looking for is onProgressUpdate(Progress...) ,
publishProgress(Progress...) of
AsyncTask

Google for their code
samples.