Java Tutorial/J2ME/ChoiceGroup

Add choice to ChoiceGroup

   <source lang="java">

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);
   }
 }

}</source>

Use ChoiceGroup

   <source lang="java">

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) {
 }

}</source>