How to call a second screen?

I don't know exactly how to call a second display (displays the results of a web service) with some parameters. I'm starting simple and sending the GPS coordinates of the current location. I would like to call the service, and then view the name of the first result in the text field. However, I get the infamous with is not the mistake of blocking event every time that I try to do the setText. Can someone tell me what I'm doing wrong here?

class Results extends UiApplication {    public static void main(String[] args) {        Results gbResults = new Results(args[1], args[2]);

        gbResults.enterEventDispatcher();    }

   private Results(String Latitude, String Longitude) {        pushScreen(new ResultsScreen(Latitude, Longitude));    }}

final class ResultsScreen extends MainScreen{

    ResultsScreen(final String Latitude, final String Longitude) {        final LabelField lblResult = new LabelField("Result:", LabelField.ELLIPSIS | LabelField.USE_ALL_WIDTH);        add(lblResult);

        UiApplication.getApplication().invokeLater(new Runnable() {            public void run() {                //Call the service and get back [wsresult]                synchronized(UiApplication.getEventLock()) {                    lblResult.setText("Result: " + [wsresult]);                }            }        });    }}

Now, I don't think that I need this class first results statement as in my first screen I call you just this screen like this:

getUiEngine().pushScreen(new ResultsScreen(String.valueOf(qc.getLatitude()),String.valueOf(qc.getLongitude())));

I think I'm calling and declaring the second screen correctly that the code is certainly get there. There is just something to do with this setText. What I need to do kind of the enterEventDispatcher () inside the ResultsScreen class?

Also, I tried to do just the invokeLater by itself and the synchronize (getEventLock) by itself and kept getting the error each time. It seems that no matter what I do, it always says that I'm not holding the lock on the event.

I realized what the problem was. When I called the getUIengine (.pushScreen), I was outside the event thread and so I had to wrap this call in a getAppLock as well. When I was debugging before she looked like she came all the way to the setText (I'm sure that was the case somehow) and then wrong so I don't think that the appeal was the cause of the problem.

Tags: BlackBerry Developers

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