Java Development

[Micah_H]

I recently got interested in programming again and decided to start out with blackberry programming. I am getting some errors right off the bat which is not encouraging but I was hoping someone could help me out.

I created a basic app based on the "Getting Started" first app tutorial. I added then added a button and a field listener for that button which displays a dialog alert. Very simple, but in my simulator (9550) I am getting a runtime exception that stops at 'TouchEventInternal.getGlobalX(int)'. This happens after I click 'OK' on the dialog alert.

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 guidance would be appreciated

[klerisson · Accepted solution]

Hey Micah_H!

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

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

The other alternative is to set the CONSUME_CLICK feature at your button:

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

Anyway, honestly, I got surprised when your code works on previous simulator 9530. I do not know why!

Regards,

Klerisson

[Micah_H]

Adding CONSUME_CLICK to my button caused the error to go away. Hopefully there are no side effects to using this flag.

Thank you.