audioplayer.java

暑期参加IT培训时J2ME下用CLDC编写的手机mp3播放软件

/*
 *
 * Copyright © 2007 Sun Microsystems, Inc. All rights reserved.
 * Use is subject to license terms.
 */


import java.io.*;

import java.util.*;

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


/**
 * This is a demo midlet to show the basic audio functionalities, to
 * play wave file, tone, tone sequence from http, resource jar file
 * and record store.
 *
 * @version
 *
 */
public class AudioPlayer extends MIDlet implements CommandListener {
    private static PlayerCanvas playerGUI = null;
    private static List theList;
    private static Vector urls;
    private Command exitCommand = new Command("Exit", Command.EXIT, 1);
    private Command playCommand = new Command("Play", Command.ITEM, 1);
    private Command delCommand = new Command("del", Command.ITEM, 1);
    private Display display;
    int n;

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

    public AudioPlayer() {
        super();
        display = Display.getDisplay(this);
        initPlayList();
        display.setCurrent(theList);
    }

    public static List getList() {
        return theList;
    }

    /**
     * Called when this MIDlet is started for the first time,
     * or when it returns from paused mode.
     * If a player is visible, and it was playing
     * when the MIDlet was paused, call its playSound method.
     */
    public void startApp() {
        if ((playerGUI != null) && restartOnResume) {
            playerGUI.playSound();
        }

        restartOnResume = false;
    }

    /**
     * Called when this MIDlet is paused.
     * If the player GUI is visible, call its pauseSound method.
     * For consistency across different VM's
     * it's a good idea to stop the player if it's currently
     * playing.
     */
    public void pauseApp() {
        restartOnResume = ((playerGUI != null) && playerGUI.isPlaying());

        if (restartOnResume) {
            playerGUI.pauseSound();
        }
    }

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

        display.setCurrent(null);
    }

    public void commandAction(Command c, Displayable s) {
        if (c == exitCommand) {
            destroyApp(true);
            notifyDestroyed();
        } 
        if (c == delCommand) { int index = theList.getSelectedIndex();
        	theList.delete(index);index=n;
        } 
        else if (((s == theList) && (c == List.SELECT_COMMAND)) || (c == playCommand)) {
            int i = theList.getSelectedIndex();

                 if (i >=0) {
                if (playerGUI == null) {
                    playerGUI = new PlayerCanvas(display);
                } else {
                    playerGUI.stopSound();
                }

                playerGUI.setParam((String)urls.elementAt(i));
                playerGUI.playSound();
                display.setCurrent(playerGUI);
            }
        }
    }

    /**
     * load the play list from thd jad file
     *
     **/
    private void initPlayList() {
        urls = new Vector();

        theList = new List("pop music", Choice.IMPLICIT);

        for (n = 1; n < 32; n++) {
            String nthURL = "PlayerURL-" + n;
            String url = getAppProperty(nthURL);

            if ((url == null) || (url.length() == 0)) {
                break;
            }

            String nthTitle = "PlayerTitle-" + n;
            String title = getAppProperty(nthTitle);

            if ((title == null) || (title.length() == 0)) {
                title = url;
            }

            urls.addElement(url);
            theList.append(title, null);
        }

        theList.addCommand(exitCommand);
        theList.addCommand(playCommand);
        theList.addCommand(delCommand);
        theList.setCommandListener(this);
    }
}