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From: Thomas Jensen <lianergoist@sejlgarnet.dk>
Subject: [J2ME] List and Font -- again
Newsgroups: comp.lang.java.help
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I have included a fully working example below. Basically, it shows that 
if I use setFont on elements in a list, and then append another element 
to the list, it throws an ArrayIndexOutOfBoundsException. If I delete 
some or all the elements, I can add up to the same number of elements as 
there were when I used setFont first time. 

Please remember, this is J2ME code, setFont() is a method to List. 

http://java.sun.com/javame/reference/apis/jsr118/javax/microedition/lcdui/
List.html

To me, this looks like a bug. In the code below, I can succesfully use 
setFont on elements already in the list, but appending a new element to 
the list throws an exception. Not using setFont on the new element, but 
just adding a new element to the list throws an exception. If I do not 
use setFont there are - of course - no problems in appending elements to 
a list.

Any ideas how to get around it? Do I really have to delete the list and 
create a new one if I want to add new elements to the list? 

-- CODE START --

import java.util.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class listtest extends MIDlet implements CommandListener {
  private Display display;
  private List list;
  private Command exitcmd, reloadcmd;
  private Vector v;
  Font f;

  public void startApp() {

    reloadcmd = new Command("Reload", Command.SCREEN, 1);
    exitcmd = new Command("Exit", Command.EXIT, 2);

    f = Font.getFont(0, 0, Font.SIZE_LARGE);

    v = new Vector(1,1);
    v.addElement("string1");
    v.addElement("string2");
    v.addElement("string3");
    v.addElement("string4");

    list = new List("", Choice.IMPLICIT);
    list.addCommand(reloadcmd);
    list.addCommand(exitcmd);
    list.setCommandListener(this);

    int i = 0;
    for (Enumeration e = v.elements(); e.hasMoreElements(); i++ ) {
      list.append((String)e.nextElement(), null);
        // ArrayIndexOutOfBoundsException, if setting font here...
        // list.setFont(i, f);
    }

    for (i=1 ; i<list.size() ; i++ ) { // not on first element
      // It's okay here
      list.setFont(i, f);
    }

    display = Display.getDisplay(this);
    display.setCurrent(list);
  }

  public void pauseApp() {
  }

  public void destroyApp(boolean unconditional) {
  }

  public void commandAction (Command c, Displayable d) {
    if (c == reloadcmd) {

//      list.deleteAll();
//      for (Enumeration e = v.elements(); e.hasMoreElements(); ) {
//        list.append((String)e.nextElement(), null);
//      }

      list.append("test", null);
        
//      for (i=0 ; i<list.size() ; i++ ) {
//        if (!list.getFont(i).equals(f)){
//          list.setFont(i, f);
//        }
//      }

      display.setCurrent(list);
    }
      
    if (c == exitcmd) {
      destroyApp(true);
      notifyDestroyed();
    }
  }
}

-- CODE END --

When running the program in Netbeans6.9 with WTK2.5.2 and JDK1.6.0.26, 
the exception says:

java.lang.ArrayIndexOutOfBoundsException
at javax.microedition.lcdui.ChoiceGroup.insertImpl(ChoiceGroup.java:1420)
at javax.microedition.lcdui.ChoiceGroup.append(ChoiceGroup.java:397)
at javax.microedition.lcdui.List.append(List.java:429)
at listtest.commandAction(listtest.java:70)
at javax.microedition.lcdui.Display$DisplayAccessor.commandAction
(Display.java:2093)
at javax.microedition.lcdui.Display$DisplayManagerImpl.commandAction
(Display.java:2929)
at com.sun.midp.lcdui.DefaultEventHandler.commandEvent
(DefaultEventHandler.java:297)
at com.sun.midp.lcdui.AutomatedEventHandler.commandEvent
(AutomatedEventHandler.java:667)
at com.sun.midp.lcdui.DefaultEventHandler$QueuedEventHandler.handleVmEvent
(DefaultEventHandler.java:711)
at com.sun.midp.lcdui.DefaultEventHandler$QueuedEventHandler.run
(DefaultEventHandler.java:608)

If if build and run with ktoolbar from WTK2.5.2, the exception says:

java.lang.ArrayIndexOutOfBoundsException
at javax.microedition.lcdui.ChoiceGroup.insertImpl(+456)
at javax.microedition.lcdui.ChoiceGroup.append(+25)
at javax.microedition.lcdui.List.append(+9)
at listtest.commandAction(+71)
at javax.microedition.lcdui.Display$DisplayAccessor.commandAction(+282)
at javax.microedition.lcdui.Display$DisplayManagerImpl.commandAction(+10)
at com.sun.midp.lcdui.DefaultEventHandler.commandEvent(+68)
at com.sun.midp.lcdui.AutomatedEventHandler.commandEvent(+47)
at com.sun.midp.lcdui.DefaultEventHandler$QueuedEventHandler.handleVmEvent
(+186)
at com.sun.midp.lcdui.DefaultEventHandler$QueuedEventHandler.run(+57)

When running the program on my Samsung B2100 phone, I get no errors, but 
the new line is not appended (list.append("test", null);) and the 4 
elements are all with standard size (not large, as 3 of them were before 
running the reload command). 


-- 
Thomas Jensen, Denmark