Updade UI thread

Hello

I want to show a list of message on a scree. I have to get a web service messages, showing a popUpScreen with a message waiting, while the service is invocated.

To do that I have created a RespuestaServicio interface and three classes, MyScreen where I want to display messages, it implements RespuestaServicio methods that are called after the Web service response is obtained, PleaseWaitPopupScreen extends from PopupScreen, which has a method that receives a thread to run while the popupscreen is showed and close itself when the thread end and finally

LlamadaWSThread is passed to the PleaseWaitPopupScreen call and that the webservice to get the list of messages.

It's code summarized:

public class MyScreen extends MainScreen implements RespuestaServicio{

    private VerticalFieldManager listaMensajes;

    public MyScreen() {
        super(Manager.NO_VERTICAL_SCROLL);
        HorizonlatFieldManager fondo = new HorizonlatFieldManager();
        listaMensajes = new VerticalFieldManager();
        vertical.add(listaMensajes);
        fondo.add(vertical);
        this.add(fondo);
        buscarMensajes();
    }

    public void buscarMensajes(){
    // Here I get some parameters like url an xml to pass to LlamadaWSThread constructor
       LlamadaWSThread serviceCaller = new LlamadaWSThread(url, this, xml);
              PleaseWaitPopupScreen.showScreenAndWait(serviceCaller);
    }

    private void llenarLista(String[] campos){
        LabelField campo;
        for(int i = 0; i < campos.length; i++){
            campo = new LabelField(campos[i]);
            campo.setMargin(0, 10, 0, 10);
            listaMensajes.add(campo);
        }
    }

    public void requestFailed(final String message) {
       UiApplication.getUiApplication().invokeLater(new Runnable() {
                 public void run() {
                Dialog.alert("requestFailed: "+message);
                 }
              });
    }

    public void requestSucceeded(Document result) {
        String[] mensajes;
        // Here I proccess result to get mesajes...;
        llenarLista(campos);
    }
}

public class PleaseWaitPopupScreen extends PopupScreen {

    private static LabelField _ourLabelField = null;

    private PleaseWaitPopupScreen() {
        super(new VerticalFieldManager());
        ourLabelField = new LabelField("Please wait");
        this.add(urLabelField);
    }

    public static void showScreenAndWait(final Runnable runThis) {
        final PleaseWaitPopupScreen thisScreen = new PleaseWaitPopupScreen(text);
        Thread threadToRun = new Thread() {
            public void run() {

                UiApplication.getUiApplication().invokeLater(new Runnable() {
                    public void run() {
                        UiApplication.getUiApplication().pushScreen(thisScreen);
                    }
                });

                try {
                    runThis.run();
                } catch (Exception t) {

                }

                UiApplication.getUiApplication().invokeLater(new Runnable() {
                    public void run() {
                        if(thisScreen != null){
                            try {
               UiApplication.getUiApplication().popScreen(thisScreen);
            } catch (Exception e) {
               Dialog.alert(e.getMessage());
                  }
                        }
                    }
                });
            }
        };
        threadToRun.start();
    }
}

public class LlamadaWSThread extends Thread {
    private RespuestaServicio pantalla;
    private ConstructorXml xml;
    private String url;

    public LlamadaWSThread(String url, RespuestaServicio pantalla, ConstructorXml xml) {
        super();
        this.url = url;
        this.pantalla = pantalla;
        this.xml = xml;
    }

    public  void    run()
    {
        HttpConnection  conn = null;
        OutputStream    oStream = null;
        try
        {
            conn    =   (HttpConnection)Connector.open( url );
            conn.setRequestMethod( HttpConnection.POST );
            oStream =   conn.openOutputStream();
            oStream.write( xml.getXml().getBytes() );
            oStream.flush();

                  InputStream is = conn.openInputStream();
            byte [] response = IOUtilities.streamToBytes(is);
            is.close();
            ByteArrayOutputStream   baos  =  new ByteArrayOutputStream();
            baos.write( response );
            DocumentBuilderFactory  dbf =   DocumentBuilderFactory.newInstance();
            DocumentBuilder db  =   dbf.newDocumentBuilder();
            Document    doc =   db.parse( new ByteArrayInputStream( baos.toByteArray() ) );
            pantalla.requestSucceeded(doc);
        }
        catch (Exception except)
        {
            pantalla.requestFailed(except.toString());
        }
    }   

}

My problem is that I'm getting this exception:

IllegalStateExeption: UI engine accesed without hoding the lock of the event

When you call llenarLista (...)  of requestSucceeded (...) who is called to LlamadaWSThread

Please reread what I proposed. You missed a part on the displacement of campo in the body of the loop for?

What you see, it's quite normal - plan you a change in the user interface that will update the display with the contents of an object, once you're done. Then you quickly change the contents of this object before all your regular screen updates has a chance to be executed. No wonder that all of these updates are only the last value of this object.

Compare your loop for:

for (int i = 0; i < campos.length; ++i) {
  final String campo = campos[i];
  UiApplication.getUiApplication().invokeLater(new Runnable() {
    public void run() {
      listaMensajes.add(new LabelField(campo));
    }
  });
}

You see the difference?

Tags: BlackBerry Developers

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