Update of the main screen to a background thread

Hi guys im trying to update the main screen from a background thread. in this case I'm using a 2 static pictures. Once I click on a butotn on the popupScreen when the application is loaded, it will update the image on the main screen.

I wrote a small excerpt for it and can you please give me some help with this. because when I've debugged and one of the developers helped me thereby to discover that the screen im trying to update is not the active screen.  Please have alook please.ive extract have 3 classes here

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

SerializableAttribute public class MyApp extends UiApplication
{

Public Shared Sub main (String [] args)
{
Create a new instance of the application and make the currently
who runs the thread of the application of the event dispatch thread.
MyApp PAP = new MyApp();
theApp.enterEventDispatcher ();
}
    
/**
* Creates a new object MyApp
*/
public MyApp()
{
Push a screen onto the stack in the user interface for rendering.
pushScreen (new MyScreen());
final Pinpopup pp = new Pinpopup();

UiApplication.getUiApplication () .invokeLater (new Runnable()
{
public void run()
{
UiApplication.getUiApplication () .pushModalScreen (pp);
}
});
}
}
////////////////////////////////////////////////////////////////////////////////////////

/ public final class screen extends MyScreen
{
/**
* Creates a new object of MyScreen
*/
public Bitmap bmp image;
public BitmapField bmpField;
public ButtonField btnDisplay;
public ImageThread imgThread;
        
public MyScreen()
{
        
Set the displayed title of the screen
setTitle ("MyTitle");
BMP = Bitmap.getBitmapResource ("image.png");
btnDisplay = new ButtonField ("Display");
bmpField = new BitmapField (bmp);

btnDisplay.setChangeListener (new FieldChangeListener() {}
            
' Public Sub fieldChanged (field field, int context) {}
TODO self-generating method stub
                
if(Field == btnDisplay)
{
BMP = Bitmap.getBitmapResource ("image1.png");
bmpField.setBitmap (bmp);
signInButtonClicked ("07760926037", "1234");
LaunchImageThread();
                    
}
}
});
        
Add (bmpField);
Add (btnDisplay);
        
}
    
    
Public Sub LaunchImageThread()
{
imgThread = new ImageThread (this);
System.out.println ("THIS screen:" + this.getScreen ()); I realized that the im screen update is not active but its strange I don't create any other refrence so
New Thread (imgThread) m:System.NET.HttpListener.start ();
}
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// POPUPSCREEN CLASS
class Pinpopup extends PopupScreen //implements FieldChangeListener
{
private ButtonField btnOk;
    
Pinpopup()
{
        
Super (new HorizontalFieldManager());

btnOk = new ButtonField ("Sign In");

btnOk.setChangeListener (new FieldChangeListener() {}

' Public Sub fieldChanged (field field, int context)
{
TODO self-generating method stub
Try
{
if(Field == btnOK)
{
Close();
MyScreen ms = new MyScreen();
Mrs. LaunchImageThread();
}
} catch (IllegalArgumentException e) {}
TODO: handle exception
System.out.println ("Exception Popup all in signingIn" + e.getMessage ());
}
}
});
        
Manager fieldManagerContext = new Manager (USE_ALL_WIDTH)
{
' public void sublayout (int width, int height) {}

int xPos = 10;
int ypos = 40;

Field = getField (0);
layoutChild (field, 280, 50);
setPositionChild (field, xpos ypos + 100 + 165);

setPosition (300, 300);
setExtent (350, 225);
}
};
        
fieldManagerContext.add (btnOk);
Add (fieldManagerContext);
}
}

/////////////////////////////////////////////////////////////////////////////////////////////////////

/ public class ImageThread implements Runnable
{
private MyScreen parent;
    
public ImageThread (MyScreen myScreen)
{
parent = myScreen;
}

public void run()
{
Try
{
UiApplication.getUiApplication () .invokeLater (new Runnable() {}
                
public void run() {}
TODO self-generating method stub
System.out.println ("active screen:" + UiApplication.getUiApplication () .getActiveScreen ());
System.out.println ("active screen:" + parent.getScreen ());
parent.bmp = Bitmap.getBitmapResource ("image1.png");
parent.bmpField.setBitmap (parent.bmp);
                    
}
});
}
catch (Exception ex)
{
System.out.println ("Exception in Thread:" + ex.getMessage ());
}
}
}

was soon thanks

I suspect that this is your problem:

MyScreen ms = new MyScreen();
Mrs. LaunchImageThread();

I suspect that if you did as I suggested on the other Thread and put a breakpoint in the constructor of MyScreen, you'd have foiund, this creates a second instance.

I hope that you can take it from here.

Tags: BlackBerry Developers

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