R – Picking a Blackberry JDE version

Well they are Java from a language standpoint. It just doesn't support all of the standard edition packages. It falls more inline with the microedition standards, but is way beyond J2ME from a package standpoint. They don't go around saying they're in compliance with J2SE 1.6, but it's still Java.

And of course it has arrays, unless you mean the class, Arrays. But, they have that too. It's located in package net.rim.device.api.util.

I looked at your code and nothing blatantly wrong jumped out at me. However, I wouldn't designate the main application class the duties of being the FieldChangeListener. It's not something it should have to be aware of. The best I can do for you is provide an example app that implements the FieldChangeListener interface for a ButtonField. It's not a solution but maybe with your better knowledge of your code you'll be able to pick something out that is different than this example. Hope it helps.

import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.container.MainScreen;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.FieldChangeListener;

/**
 * Test implementation of ButtonField.
 */
public class TestAppMain extends UiApplication 
{
    /**
     * Default Constructor.
     */
    private TestAppMain() {        
        pushScreen(new AppScreen());
    }

    /**
     * App entry point.
     * @param args Arguments.
     */
    public static void main(String[] args) {
        TestAppMain app = new TestAppMain();
        app.enterEventDispatcher();
    }

    /**
     * Main application screen.
     */
    private static class AppScreen extends MainScreen 
    {
        /**
         * Default constructor.
         */
        public AppScreen() {
            LabelField title = new LabelField("Button Test Demo",
                    LabelField.ELLIPSIS | LabelField.USE_ALL_WIDTH);
            setTitle(title);

            // Create a button with a field change listener.
            FieldChangeListener listener = new FieldChangeListener() {
                public void fieldChanged(Field field, int context) {
                    ButtonField buttonField = (ButtonField) field;
                    System.out.println("Button pressed: " + buttonField.getLabel());
                }
            };
            ButtonField buttonField = new ButtonField("Test Button", ButtonField.CONSUME_CLICK);            
            buttonField.setChangeListener(listener);
            add(buttonField);
        }               

        /**
         * Handle app closing.
         */
        public void close() {
            Dialog.alert("Goodbye!");
            System.exit(0);
            super.close();
        }
    }
}