Add choice to ChoiceGroup : ChoiceGroup « J2ME « Java Tutorial

1. Java Tutorial
2. J2ME
3. ChoiceGroup

import javax.microedition.lcdui.Choice;
import javax.microedition.lcdui.ChoiceGroup;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.ItemStateListener;
import javax.microedition.lcdui.StringItem;
import javax.microedition.midlet.MIDlet;

public class J2MERadioButtons extends MIDlet implements ItemStateListener, CommandListener {
  private Display display;

  private Form form = new Form("");

  private Command exit = new Command("Exit", Command.EXIT, 1);

  private ChoiceGroup radioButtons = new ChoiceGroup("Select Your Color", Choice.EXCLUSIVE);

  private int defaultIndex;

  public J2MERadioButtons() {
    display = Display.getDisplay(this);
    radioButtons.append("Red", null);
    radioButtons.append("White", null);
    radioButtons.append("Blue", null);
    radioButtons.append("Green", null);
    defaultIndex = radioButtons.append("All", null);
    radioButtons.setSelectedIndex(defaultIndex, true);
    
    form.addCommand(exit);
    form.setCommandListener(this);
    form.setItemStateListener(this);
  }

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

  public void pauseApp() {
  }

  public void destroyApp(boolean unconditional) {
  }

  public void commandAction(Command command, Displayable displayable) {
    if (command == exit) {
      destroyApp(true);
      notifyDestroyed();
    }
  }

  public void itemStateChanged(Item item) {
    if (item == radioButtons) {
      StringItem msg = new StringItem("Your color is ", radioButtons.getString(radioButtons.getSelectedIndex()));
      form.append(msg);
    }
  }
}

31.9.ChoiceGroup
	31.9.1.	Use ChoiceGroup
	31.9.2.	Add choice to ChoiceGroup