TouchEvent exception on vary basic app (9550 sim)

I have recently interested in programming again and decided to start with the programming of blackberry. I get errors immediately the bat which is not encouraging, but I was hoping someone could help me.

I created a basic "Getting Started"-based application first tutorial app. I added then added a button and a listener of field for this button that displays an alert dialog box. Very simple, but in my Simulator (9550) I get a runtime exception which stops at "TouchEventInternal.getGlobalX (int). This happens when I click 'OK' on the alert dialog.

Here is the Stack Trace:

Thread [Checklist(176)id=295857152] (Suspended (exception RuntimeException))
    TouchEventInternal.getGlobalX(int) line: 222
    ChecklistScreen(Screen).dispatchTouchEvent(TouchEvent) line: 1010
    UiEngineImpl.processMessage(Object, Message, boolean) line: 3388
    Checklist(Application).doProcessNextMessage(Message) line: 2268
    Checklist(Application).processNextMessage(Message) line: 1530
    Checklist(Application).enterEventDispatcher() line: 1371
    Checklist.main(String[]) line: 11

And here is my Code:

CheckList.java:

package com.rim.samples.checklist;

import net.rim.device.api.ui.UiApplication;

public class Checklist extends UiApplication
{

    public static void main(String[] args)
    {
        Checklist theApp = new Checklist();
        theApp.enterEventDispatcher();
    }
    public Checklist()
    {
        pushScreen(new ChecklistScreen());
    }
}

ChecklistScreen.java:

package com.rim.samples.checklist;

import java.util.*;
import net.rim.device.api.ui.*;
import net.rim.device.api.ui.container.MainScreen;
import net.rim.device.api.ui.component.*;

public final class ChecklistScreen extends MainScreen
{
    public ChecklistScreen()
    {
        super();
        ButtonField button = new ButtonField("Add New");
        FieldChangeListener action = new FieldChangeListener(){
            public void fieldChanged(Field field, int context)
            {
                Dialog.alert("YOU PUSHED A BUTTON");
            }
        };
        button.setChangeListener(action);
        add(button);
    }
    public boolean onClose()
    {
        Dialog.alert("Cya!");
        System.exit(0);
        return true;
    }
}

Any help or advice would be appreciated

Micah_H Hey!

I guess you need to access the UI event handling, since it seems that you are outdoors. For example, you can use invokeLater () methods or invokeAndWait ().

UiApplication.getUiApplication().invokeLater(new Runnable(){
    public void run() {
        Dialog.alert("YOU PUSHED A BUTTON");
    }
});

The other alternative is to set the CONSUME_CLICK function to your button:

ButtonField button = new ButtonField("Add New", ButtonField.CONSUME_CLICK);

Anyway, honestly, I surprised when your code works on previous 9530 Simulator. I don't know why!

Kind regards

Klerisson

Tags: BlackBerry Developers

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