ProgressDialog/ProgressBar

How do we update progressDialog or progressBar when app receives data(from web) ?

We need two classes. One is MainViewActivity class another is WebServiceAPI class

1. MainViewActivity is main View activity that is responsible for show progressbar.

public class MainViewActivity extends Activity implements WebServiceAPI.OnProductDataReceivedListener
{
    private ProgressBar mProgressBar;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        LayoutInflater inflater = (LayoutInflater)this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(R.layout.main_view, null);
        Util.WebServiceAPI.addProductDataReceivedListener(this); // Add Data Received Listener
        mProgressBar = (ProgressBar)view.findViewById(R.id.progressBar);
        runWebService();
    }
    @Override
    public void onDataReceive(long total, long current)
    {
        final int max = (int)total;
        mProgressBar.setMax(max);
        final int progress = (int)current +1;

        runOnUiThread(new Runnable() {
                          @Override
                          public void run() {
                              mProgressBar.setProgress(progress);
                          }
                      }
        );
    }
}

1. WebServiceAPI is responsible for receiving data from web and notice the caller by interface event. Notice: Thread.sleep(100) is very import. If you don't using Thread.sleep, the progress bar UI will not update fluently.

public class WebServiceAPI
{
    private static List<OnProductDataReceivedListener> _OnProductDataReceivedListener = new ArrayList<OnProductDataReceivedListener>();
    public interface OnProductDataReceivedListener
    {
        abstract void onDataReceive(long total, long current);
    }
    public static void addProductDataReceivedListener(OnProductDataReceivedListener listener)
    {
        _OnProductDataReceivedListener.add(listener);
    }
    public static void removeProductDataReceivedListener(OnProductDataReceivedListener listener)
    {
        _OnProductDataReceivedListener.remove(listener);
    }
    public static void clearProductDataReceivedListener()
    {
        _OnProductDataReceivedListener.clear();
    }
    public static void runWebService()
    {
        //1. Run Web Service
        //blabla
        //We Assiume the data total is 100;
        int count = 100;
        for (int index = 0 ; index < count ; index++)
        {
            _OnProductDataReceivedListener.get(0).onDataReceive(count, index);
            Thread.sleep(100); //This is very import. If you don't using sleep, the progress bar UI will not update fluently.
        }
    }
}