Loading Screen not working in Blackberry?

I want to implement a loading screen in blackberry. I try the code from following Support forum link using following code

PleaseWaitPopupScreen.showScreenAndWait(new Runnable() {

        public void run() {
                           //**Segment 1** here i write the code for  network call
                                    }
                           }, "please wait");
                     // **Segment 2**:Here processing the data get from network call

the problem is the segment 2 works before completing the segment 1. I also try the following code

HorizontalFieldManager popHF = new HorizontalFieldManager();
    popHF.add(new LabelField("Pls wait..."));
    final PopupScreen waitScreen = new PopupScreen(popHF);
    new Thread()
    {
        public void run() 
        {

            synchronized (UiApplication.getEventLock()) 
            {
                UiApplication.getUiApplication().pushScreen(waitScreen);
            }
           // **Segment 1**Here Some Network Call 

          synchronized (UiApplication.getEventLock()) 
            {
                UiApplication.getUiApplication().popScreen(waitScreen);

            }
         }
     }.start();
     // **Segment 2**:Here pr开发者_开发技巧ocessing the data get from network call

the same problem arises. Any help will be appreciated.

thanks

Actually it depends on what you're doing in segment 2. If there is no UI actions, then just move segment 2 inside the thread that makes http call. e.g.:

final PopupScreen waitScreen = new PopupScreen(popHF);
new Thread()
{
    public void run() 
    {
        synchronized (UiApplication.getEventLock()) 
        {
            UiApplication.getUiApplication().pushScreen(waitScreen);
        }
        // **Segment 1**Here Some Network Call

        // **Segment 2**:Here processing the data get from network call

        synchronized (UiApplication.getEventLock()) 
        {
            UiApplication.getUiApplication().popScreen(waitScreen);
        }
     }
 }.start();

But if there are UI actions inside of segment 2, then call it on UI thread, right after you pop off the wait screen:

final PopupScreen waitScreen = new PopupScreen(popHF);
new Thread()
{
    public void run() 
    {
        synchronized (UiApplication.getEventLock()) 
        {
            UiApplication.getUiApplication().pushScreen(waitScreen);
        }
        // **Segment 1**Here Some Network Call

        synchronized (UiApplication.getEventLock()) 
        {
            UiApplication.getUiApplication().popScreen(waitScreen);
            // **Segment 2**:Here processing the data get from network call
        }
     }
 }.start();