/* * %W% %E% * * Copyright (c) 2000-2004 Sun Microsystems, Inc. All rights reserved.  * PROPRIETARY/CONFIDENTIAL * Use is subject to license terms */package list;import javax.microedition.lcdui.*;import javax.microedition.midlet.MIDlet;/** * The MIDlet demonstrates the different types of list supported by MIDP-2.0: *      EXCLUSIVE - a choice having exactly one element selected at time. *      IMPLICIT  - a choice in which the currently focused element is *                  selected when a Command is initiated. *      MULTIPLE  - a choice that can have arbitrary number of elements *                  selected at a time. * * @version 2.0 */public class ListDemo    extends MIDlet    implements CommandListener {    private final static Command CMD_EXIT =	    new Command("Exit", Command.EXIT, 1);    private final static Command CMD_BACK =	    new Command("Back", Command.BACK, 1);    private Display display;    private List mainList;    private List exclusiveList;    private List implicitList;    private List multipleList;        private boolean firstTime;    public ListDemo() {        display = Display.getDisplay(this);        // these are the strings for the choices.        String[] stringArray = {            "Option A",             "Option B",             "Option C",             "Option D"        };        // the string elements will have no images        Image[] imageArray = null;        /*	 * create samples of the supported types:         *      "Exclusive", "Implicit" and  "Multiple"	 */        exclusiveList = new List("Exclusive", Choice.EXCLUSIVE, stringArray,                                  imageArray);        exclusiveList.addCommand(CMD_BACK);        exclusiveList.addCommand(CMD_EXIT);        exclusiveList.setCommandListener(this);        implicitList = new List("Implicit", Choice.IMPLICIT, stringArray,                                 imageArray);        implicitList.addCommand(CMD_BACK);        implicitList.addCommand(CMD_EXIT);        implicitList.setCommandListener(this);        multipleList = new List("Multiple", Choice.MULTIPLE, stringArray,                                 imageArray);        multipleList.addCommand(CMD_BACK);        multipleList.addCommand(CMD_EXIT);        multipleList.setCommandListener(this);                firstTime = true;    }    protected void startApp() {        if (firstTime) {            // these are the images and strings for the choices.            Image[] imageArray = null;                try {                // load the duke image to place in the image array                Image icon = Image.createImage("/midp/uidemo/Icon.png");                        // these are the images and strings for the choices.                imageArray = new Image[] {                    icon,                     icon,                     icon                };            } catch (java.io.IOException err) {                // ignore the image loading failure the application can recover.            }                String[] stringArray = {                "Exclusive",                 "Implicit",                 "Multiple"            };            mainList = new List("Choose type", Choice.IMPLICIT, stringArray,                                 imageArray);            mainList.addCommand(CMD_EXIT);            mainList.setCommandListener(this);            display.setCurrent(mainList);            firstTime = false;        }    }    protected void destroyApp(boolean unconditional) {    }    protected void pauseApp() {    }    public void commandAction(Command c, Displayable d) {        if (d.equals(mainList)) {            // in the main list            if (c == List.SELECT_COMMAND) {                if (d.equals(mainList)) {                    switch (((List)d).getSelectedIndex()) {                        case 0:                            display.setCurrent(exclusiveList);                            break;                        case 1:                            display.setCurrent(implicitList);                            break;                        case 2:                            display.setCurrent(multipleList);                            break;                    }                }            }        } else {            // in one of the sub-lists            if (c == CMD_BACK) {                display.setCurrent(mainList);            }        }        if (c == CMD_EXIT) {            destroyApp(false);            notifyDestroyed();        }    }}