Java Development

[ALEXZAGO]

Hi,

We are trying to push the screen PopUpColeta (below) inside the TimeAuditor class which extends Thread (details below) but we get the following exception: "java.lang.IllegalStateException: UI engine accessed without holding the event lock"

public class PopUpColeta extends PopupScreen implements KeyListener

public class TimeAuditor extends Thread

UiApplication.getUiApplication().pushScreen(popUpColeta)

For some reason the pushScreen command above works fine when we place it inside the MainScreen.

We are using BlackBerry Component Pack 4.5.0

Thanks!

[RexDoug]

Place the pushScreen or popScreen inside of a Runnable and pass this Runnable to UiApplication.invokeLater()

Something like this:

   /**
     * Stop the status display
     */
    private void stopStatusDisplay()
    {
        if (m_statusDisplay != null){
            m_app.invokeLater(new Runnable() {
                public void run()
                {    
                    m_statusDisplay.close();
                    m_statusDisplay = null;
                }
            });
        }        
    }    

Note that I'm storing an instance of my application (m_app), since you can't always rely on UiApplication.getApplication(), depending on the context of the thread that is calling the UI.

Message Edited by RexDoug on 07-25-2009 10:47 AM

[bsmith138]

RexDoug:  In what context can you not rely on the UiApplication.getApplication() method?

[RexDoug]

This static method will return the current UiApplication, which may not be your application in certain circumstances.

For example, your app is called form a Message listener or Phone listener. In this case, the application context belongs to the calling app, not yours.