How to create an exit button using onChangeListener

Hey this is the noob again. I finally my main screen GUI put in place and it looks great so now I want to add some features to my buttons. I have been looking around but little lost in how to do this, so here's some of my code. Right now I just try to make the exit button (that I created), exit the application and say something. Any help?  Oh, and another question, for another button, how could I get this button to switch screens to another category (for example a help button goes to a help page)

Thanks again!

That's what I have:

ButtonField exitBut = new ButtonField ("Exit", Field.FIELD_HCENTER)

FieldChangeListener listenerExitBut = new FieldChangeListener() {}
       
' Public Sub fieldChanged (field field, int context) {}
           
}
public boolean onClose()
{
Dialog.Alert ("Bye World!");
System.Exit (0);
Returns true;
}
};
       
exitBut.setChangeListener (listenerExitBut);
   
fieldManagerMid.add (exitBut);

You can instance fieldChangeListener in 2 ways

1. create an internal interface of the fieldChangeListener

2. to implement the fieldChangeListener in your screen

in this Sub fieldChanged, you need to determine the user click

public void fieldChanged(Field field, int context) {
   if (field == exitBut)
   {
      Dialog.alert("Bye World!");
      System.exit(0);
   }
}

Correct me if I'm wrong

Tags: BlackBerry Developers

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