How to push a new Screen when document is loaded in BrowserField? - blackberry

Question

In my application I have a log in Screen. When the user enter the correct user name and password I have to collect the information from the website and navigate to main Screen.
I tried following code. But this code is not working. How to achieve it?
public final class MyScreen extends MainScreen {
public MyScreen() {
BrowserFieldConfig myBrowserFieldConfig = new BrowserFieldConfig();
myBrowserFieldConfig.setProperty(BrowserFieldConfig.NAVIGATION_MODE,
BrowserFieldConfig.NAVIGATION_MODE_POINTER);
BrowserField browserField = new BrowserField(myBrowserFieldConfig);
BrowserFieldListener list = new BrowserFieldListener() {
public void documentLoaded(BrowserField browserField, Document document) throws Exception {
String url = document.getBaseURI();
String val = "http://demo.....";
//i am checking the correct url and i will navigate to main screen
if (url.equals(new String(val))) {
UiApplication.getUiApplication().pushScreen(new Main());//here i got IllegalStateException ..
}
System.out.println(" Login URL " + url);
//super.documentLoaded(browserField, document);
}
};
browserField.addListener(list);
add(browserField);
String URL = "http://demo.....";
if (DeviceInfo.isSimulator()) {
URL = URL + ";deviceSide=true";
}
browserField.requestContent(URL);
}
}

Answer 1

in place of
UiApplication.getUiApplication().pushScreen(new Main());
use
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
UiApplication.getUiApplication().pushScreen(new Main());
}
});
you need to do it under ui Thread.
Check it.