gistfile1.java

public class MyActivity extends Activity implements PBarChange {

  private ProgressBar mPbar;
  private MyThread mMyThread;

  public void onCreate(...){
      super.onCreate(...);
      
      setContentView(R.id.content);
      mPbar = (ProgressBar)findViewById(R.id.pbar);
      mMyThread = new MyThread(this);
      mMyThread.start();
  }
  
  public void onDestroy(){
    mMyThread.stop();
  }
  
  public void onProgressChanged(int progress){
    mPbar.setProgress(progress);
  }
}

public class MyThread extends Thread {
    public interface PBarChange {
        void onProgressChanged(int progress);
    }
    
    private Handler mHandler;
    private int mProgress;
    private boolean mIsRunning = true;
    
    public class MyThread(PBarChange listener){
        mListener = listener;
        mHandler = new Handler(Looper.getMainLooper());
    }

    public void run() {
        while(mIsRunning) {
          mProgress = 10...;
          mHandler.post(mUpdateAction);
        }
    }
    
    public void stop(){
      mIsRunning = false;
    }
    
    private Runnable mUpdateAction = new Runnable(){
        public void run(){
            mListener.onProgressChanged(mProgress);
        }
    }
}