Java Tutorial/J2ME/ChoiceGroup

Add choice to ChoiceGroup

import javax.microedition.lcdui.Choice;
import javax.microedition.lcdui.ChoiceGroup;
import javax.microedition.lcdui.rumand;
import javax.microedition.lcdui.rumandListener;
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);
    }
  }
}

Use ChoiceGroup

import java.io.IOException;
import javax.microedition.lcdui.ChoiceGroup;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Image;
import javax.microedition.midlet.MIDlet;
public class ChoiceGroupMIDlet extends MIDlet {
  protected Display display;
  protected void startApp() {
    display = Display.getDisplay(this);
    Form form = new Form("Demo");
    form.append("line");
        try {
          Image red = Image.createImage("/red.png");
          Image green = Image.createImage("/green.png");
          Image blue = Image.createImage("/blue.png");
    
          String[] strings = new String[] { "Red", "Green", "Blue" };
          Image[] images = new Image[] { red, green, blue };
          ChoiceGroup exGroup = new ChoiceGroup("Choose one", ChoiceGroup.EXCLUSIVE,
                                                      strings, images);
          form.append(exGroup);
          ChoiceGroup multiGroup = new ChoiceGroup("Choose any", ChoiceGroup.MULTIPLE);
          form.append(multiGroup);
          multiGroup.append("Use SSL", null);
          multiGroup.append("Reconnect on failure", null);
          multiGroup.append("Enable tracing", null);
       } catch (IOException ex) {
          form.append("Failed to load images");
       }

    display.setCurrent(form);
  }
  protected void pauseApp() {
  }
  protected void destroyApp(boolean unconditional) {
  }
}