www.pudn.com > AudioSamples1.rar > BBall.java

/*
 *
 * 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
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 * 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 example.audiodemo;

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;


/*
 * this is a sample program to show ring tones synchronized with
 * selected background music.
 * It is based on the manyballs midlet. When a ball hits a wall,
 * a ring tone is heard.
 *
 * Usage: Use right arrow key to add one more ball (5 is the maximum).
 *        Use left arrow key to delete one ball
 *        Use up   arrow key to increase the speed of ball
 *        Use down arrow key to reduce the speed of ball
 *
 * @version
 */
public class BBall extends MIDlet implements CommandListener, Runnable {
    private static final String[] bgs =
        { "no background", "wave background", "tone seq background", "MIDI background" };
    static String wavbgUrl;
    static String midbgUrl;
    private static final Object gameLock = new Object();
    private Command exitCommand = new Command("Exit", Command.EXIT, 1);
    private Command playCommand = new Command("Play", Command.ITEM, 1);
    private Display display;
    private int idx = 0;
    private List theList;
    private BallCanvas game;

    // if this MIDlet's startApp method is started
    // for the first time
    private boolean firstTime = true;

    // pause/resume support
    private boolean restartOnResume = false;

    public BBall() {
        display = Display.getDisplay(this);
        theList = new List("Bouncing Ball", Choice.IMPLICIT);

        for (int i = 0; i < bgs.length; i++) {
            theList.append(bgs[i], null);
        }

        wavbgUrl = getAppProperty("BBall-wav-URL");
        midbgUrl = getAppProperty("BBall-MIDI-URL");
        theList.addCommand(playCommand);
        theList.addCommand(exitCommand);
        theList.setCommandListener(this);
    }

    // also called from BallCanvas
    public void displayList() {
        display.setCurrent(theList);
    }

    /**
     * Called when this MIDlet is started for the first time,
     * or when the MIDlet returns from paused mode.
     *
     * If it is the first time, display the menu list.
     *
     * Otherwise, wake up the thread. If music was playing
     * when the MIDlet was paused, call the game's
     * start method.
     */
    public void startApp() {
        if (firstTime) {
            displayList();
            firstTime = false;
        } else {
            SmallBall.paused = false;

            if ((game != null) && restartOnResume) {
                game.start();
            }

            restartOnResume = false;
        }
    }

    /**
     * Called when this MIDlet is paused.
     * Pause the thread.
     * If the game is not already paused, call its pause method.
     * For consistency across different VM's,
     * it's a good idea to stop the player if
     * it's currently playing.
     */
    public void pauseApp() {
        SmallBall.paused = true;
        restartOnResume = ((game != null) && !game.isPaused());

        if (restartOnResume) {
            game.pause();
        }
    }

    /**
     * Destroy must cleanup everything not handled
     * by the garbage collector.
     */
    public void destroyApp(boolean unconditional) {
        synchronized (gameLock) {
            if (game != null) {
                game.destroy();
            }
        }
    }

    /*
     * Respond to commands, including exit
     * On the exit command, cleanup and notify that the MIDlet has
     * been destroyed.
     */
    public void commandAction(Command c, Displayable s) {
        if (c == exitCommand) {
            synchronized (gameLock) {
                if (game != null) {
                    game.destroy();
                    game = null;
                }
            }

            destroyApp(false);
            notifyDestroyed();
        } else if (((s == theList) && (c == List.SELECT_COMMAND)) || (c == playCommand)) {
            idx = theList.getSelectedIndex();
            new Thread(this).start();
        }
    }

    public void run() {
        synchronized (gameLock) {
            if (game == null) {
                game = new BallCanvas(this);
            }

            display.setCurrent(game);
            game.init(8, idx);

            if (game.needAlert()) {
                Alert alert = new Alert("Warning", "Cannot create player", null, null);
                alert.setTimeout(1000);
                display.setCurrent(alert, game);
            }

            game.start();
        }
    }
}