Multiple ChoiceGroup

* Example from the book: Core J2ME Technology
* Copyright John W. Muchow
* You may use/modify for any non-commercial purpose
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class MultipleChoiceGroup extends MIDlet implements ItemStateListener, CommandListener
private Display display; // Reference to display object
private Form fmMain; // The main form
private Command cmExit; // A Command to exit the MIDlet
private Command cmView; // View the choice selected
private int selectAllIndex; // Index of the “Select All” option
private ChoiceGroup cgPrefs; // Choice Group of preferences

private int choiceGroupIndex; // Index of choice group on form

public MultipleChoiceGroup()
display = Display.getDisplay(this);

// Create a multiple choice group
cgPrefs = new ChoiceGroup(”Preferences”, Choice.MULTIPLE);

// Append options, with no associated images
cgPrefs.append(”Auto Indent”, null);
cgPrefs.append(”Replace Tabs”, null);
cgPrefs.append(”Wrap Text”, null);
selectAllIndex = cgPrefs.append(”Select All”, null);

cmExit = new Command(”Exit”, Command.EXIT, 1);
cmView = new Command(”View”, Command.SCREEN,2);

// Create Form, add components, listen for events
fmMain = new Form(””);
choiceGroupIndex = fmMain.append(cgPrefs);

public void startApp()

public void pauseApp()
{ }

public void destroyApp(boolean unconditional)
{ }

public void commandAction(Command c, Displayable s)
if (c == cmView)
boolean selected[] = new boolean[cgPrefs.size()];

// Fill array indicating whether each element is checked

for (int i = 0; i < cgPrefs.size(); i++)
System.out.println(cgPrefs.getString(i) + (selected[i] ? “: selected” : “: not selected”));

else if (c == cmExit)

public void itemStateChanged(Item item)
if (item == cgPrefs)
// Is “Select all” option checked ?
if (cgPrefs.isSelected(selectAllIndex))
// Set all checkboxes to true
for (int i = 0; i < cgPrefs.size() – 1; i++)
cgPrefs.setSelectedIndex(i, true);

// Remove the check by “Select All”
cgPrefs.setSelectedIndex(selectAllIndex, false);

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