Contextual dialog box before you call network - not in the EXPECTED order

In my application, I would like to display a dialog box, while the application is retrieving data from a web server. What I find is that the dialog box is not displayed until the data recovery is complete. Don't know what I'm doing wrong, but here are my code snippets. Suggestions are appreciated.

public class HomeScreen extends MainScreen  {

    private ImageScreen imageScreen;

    private MenuItem  viewImage = new MenuItem("View Image",100,10) {
      public void run() {
            imageScreen = new ImageScreen();            UiApplication.getUiApplication().pushScreen(imageScreen);
         imageScreen.getImage();
      }
    };}

public class  ImageScreen extends MainScreen {   private Dialog statusDlg; 

   public ImageScreen() {           statusDlg = new Dialog("Loading...",null,null,0,icon);       

       // some other initializations here   } 

    public void getImage() throws Exception {        statusDlg.show();

        // create the connection...        HttpConnection conn = (HttpConnection) Connector.open(URL,Connector.READ_WRITE, true);        conn.setRequestMethod(HttpConnection.POST);

        // set paramters and write out requests here        .        .        .

        // open input stream to get response from server        InputStream in = conn.openInputStream();

        // process the response        processResponse(conn.getResponseCode(), in);          

        // close everything out        .        .    }  

    public void processResponse(final int HTTPResponseCode, final InputStream inputStream)     {

      UiApplication.getUiApplication().invokeLater(new Runnable() {        public void run()        {          statusDlg.close();

          // process response here          .          .          .        }      });        }    

}

I want to see is a blank screen with a pop - up dialog box indicating that the data is "Loading"... ", while imageScreen.getImage () is executed (I voluntarily added latency in my HTTP response to simulate the network latency). But instead, I see that the application remains on the screen (home screen), while the data are read. Once the data is extracted, the new screen (ImageScreen) is displayed and the dialog box opens for a fraction of a second.

I hope this makes sense. I can clarify more, otherwise.

It's because you make blocking network operation of e/s on the event thread (aka user interface thread). The getImage method is called on the thread of the event, this method calls the blocking network i/o operation. After processing the event of the user interface that caused the getImage method is called, the event thread starts processing the next events, which tells the OS to display your popup. This, obvsiouly, doesn't happen until GetImage ends.

What GetImage should probably do is network IO unloading in another thread (for example, starting a new thread).

Tags: BlackBerry Developers

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