listdemo.java

J2ME各种手机UI的演示,开发环境为NetBeans6

/*
 *
 * Copyright (c) 2007, Sun Microsystems, Inc.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  * Neither the name of Sun Microsystems nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
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 static final Command CMD_EXIT = new Command("Exit", Command.EXIT, 1);
    private static final 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();
        }
    }
}