Problemas no Aplicativo - ChoiceGroup

Mobile
#1

fala pessoal…

Alguem sabe o que acontece com essa Midlet… O aplicativo tem que atualizar a lista de acordo com o que se escolhe no ChoiceGroup.POPUP:

[code]import javax.microedition.midlet.;
import javax.microedition.lcdui.;

public class Midlet1 extends MIDlet implements CommandListener{
Display display;
Form frmMain;
ChoiceGroup groupOpcoes, groupBand;
String[] lstOpcoes = {“A”, “B”, “C”};
String[] lstA = {“A1”, “A2”, “A3”, “A4”, “A5”};
String[] lstB = {“B1”, “B2”, “B3”, “B4”, “B5”};
String[] lstC = {“C1”, “C2”, “C3”, “C4”, “C5”};

public Midlet1() {
    display = Display.getDisplay(this);
	frmMain = new Form("Bem-vindo");
	
    groupOpcoes = new ChoiceGroup ("Teste", Choice.POPUP);
    frmMain.append(groupOpcoes);
    
    for (int i = 0; i < lstOpcoes.length; i++) {
        groupOpcoes.append(i+1 + ". "+lstOpcoes[i], null);
    }
    
      switch (groupOpcoes.getSelectedIndex()){
        case 0 : {
            groupBand = new ChoiceGroup(groupOpcoes.getString(groupOpcoes.getSelectedIndex()), Choice.MULTIPLE);
            for (int i = 0; i < lstA.length; i++)
                groupBand.append(lstA[i], null);
        }
        case 1 : {
            groupBand = new ChoiceGroup(groupOpcoes.getString(groupOpcoes.getSelectedIndex()), Choice.MULTIPLE);
            for (int i = 0; i < lstB.length; i++)
                groupBand.append(lstB[i], null);
        }
        case 2: {
            groupBand = new ChoiceGroup(groupOpcoes.getString(groupOpcoes.getSelectedIndex()), Choice.MULTIPLE);
            for (int i = 0; i < lstC.length; i++)
                groupBand.append(lstC[i], null);
        }
    }
    frmMain.append(groupBand);
    frmMain.setCommandListener(this);
}

public void startApp() {
    display.setCurrent(frmMain);
}

public void pauseApp() {
}

public void destroyApp(boolean unconditional) {
}

public void commandAction(Command c, Displayable d) {

}

}
[/code]

#2

Assim:

[code]
//Ouvinte
frmMain.setItemStateListener(new ItemStateListener() {
public void itemStateChanged(Item item) {
if (item instanceof ChoiceGroup) {
ChoiceGroup obj = (ChoiceGroup)item;
if (obj == groupOpcoes) {
//bloco de comandos
}
}
}

         });[/code]

Joao

#3