simpleplayer.java

索爱的多媒体例程,包括播放音乐,视频等

/*
 * @(#)SimplePlayer.java	1.2 03/01/22
 *
 * Copyright (c) 2000-2003 Sun Microsystems, Inc. All rights reserved. 
 * PROPRIETARY/CONFIDENTIAL
 * Use is subject to license terms
 */

package example.mmademo;

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.media.*;
import javax.microedition.media.control.*;
import java.util.*;
import java.io.*;

/**
 * An example MIDlet for a generic Player for audio, MIDI media
 * The top-level URLs are configured in the jad file:<br>
 * <code>PlayerURL-n</code> defines the n'th URL<br>
 * <code>PlayerTitle-n</code> defines the n'th title
 * <p>
 * Special URL "protocols" can be used:<br>
 * <code>resource:</code> for media data from the jar<br>
 * <code>rms:</code> for media data from RMS memory<br>
 * <p>
 * Examples:<br>
 * <code>
 * PlayerURL-1:   http://server.com/ <br>
 * PlayerTitle-1: Browse server.com <br>
 * PlayerURL-2:   resource:/audio/hello.wav <br>
 * PlayerTitle-2: hello.wav from jar <br>
 * PlayerURL-3:   http://localhost/movie.mpg <br>
 * PlayerTitle-3: Funny movie <br>
 * PlayerURL-4:   rms:/ <br>
 * PlayerTitle-4: Browse Record Stores<br>
 * </code>
 *
 * @author Florian Bomers
 * @version 1.7
 */
public class SimplePlayer extends BaseListMidlet implements Utils.BreadCrumbTrail, Utils.QueryListener {

    private static final String manualEnterURL="manual";
    private static final String manualEnterTitle="[enter URL]";
    private String lastManualURL = "";
	
    private Vector titles;
    private Vector urls;
    
    // SimplePlayerCanvas is the default player
    private SimplePlayerCanvas simplePlayerCanvas = new SimplePlayerCanvas("MMA Player", this);
    
    private Utils.ContentHandler[] handlers = {
    	new SimpleHttpBrowser("MMA HTTP Browser", this),
    	new SimpleRmsBrowser("MMA RMS Browser", this),
    	simplePlayerCanvas,
    	//new SimplePlayerForm("MMA Player", this), // will be instanciated by SimplePlayer
    };

    public SimplePlayer() {
        super("MMA Player");
    }

    protected void fillList(List list) {
	titles = new Vector();
    	urls = new Vector();
	for (int n = 1; n < 100; 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;
	    }
            titles.addElement(title);
            urls.addElement(url);
            list.append(title, null);
	}
	// TODO: add MRU list here
	
	// manual enter of URL
	titles.addElement(manualEnterTitle);
	urls.addElement(manualEnterURL);
	list.append(manualEnterTitle, null);
	
        list.addCommand(exitCommand);
        list.addCommand(selectCommand);
    }

    /**
     * Main function that decides which class to display
     * dependant on the url.
     */
    public void handle(String title, String url) {
System.err.println("title: " + title + "url: " + url);
	try {
	    InputStream is = null;
	    String ct = "";
	    // first magic URL's
	    if (url.equals(manualEnterURL)) {
			enterURL();
			return;
	    }
	    else if (url.startsWith("resource:")) {
			is = getClass().getResourceAsStream(url.substring(9));
			System.err.println("is: " + is);
	    }
	    else if (SimpleRmsBrowser.isRmsFile(url)) {
			is = SimpleRmsBrowser.getRecordStoreStream(url);
	    } 
		ct = Utils.guessContentType(url);
	    // ringtone text file ?
	    if (ct.equals("audio/x-txt")) {
			RingToneConverter rtc;
			if (is != null) {
				rtc = new RingToneConverter(is, title);
			} else {
				rtc = new RingToneConverter(url, title);
			}
			Player tonePlayer = Manager.createPlayer(Manager.TONE_DEVICE_LOCATOR); 
			tonePlayer.realize();
			ToneControl tc = (ToneControl) tonePlayer.getControl("ToneControl"); 
			tc.setSequence(rtc.getSequence());
			// do NOT prefetch this player. Otherwise SimplePlayerGUI will not initialize this player
			go(simplePlayerCanvas);
			simplePlayerCanvas.handle(rtc.getName(), tonePlayer);
			return;
	    }
	    if (is != null) {
			go(simplePlayerCanvas);
			simplePlayerCanvas.handle(title, is, ct);
			return;
	    } else {
			for (int i=0; i<handlers.length; i++) {
				if (handlers[i].canHandle(url)) {
					go((Displayable) handlers[i]);
					handlers[i].handle(title, url);
					return;
				}
			}
	    }
	    Utils.error("No handler available!", this);
	} catch (Exception e) {
	    Utils.error(e, this);
	}
    }

    protected void selectCommand(int index) {
    	if (index>=0) {
	    if (index<titles.size()) {
		handle((String) titles.elementAt(index), (String) urls.elementAt(index));
	    }
    	}
    }
    
    /**
     * Display a prompt for a new URL
     */
    private void enterURL() {
    	Utils.query("Enter a URL", lastManualURL, 300, TextField.URL, this, this);
    }
    
    ////////////////////// interface Utils.QueryListener /////////////////////
    public void queryOK(String text) {
    	handle(text, text);
    	lastManualURL = text;
    }
    
    public void queryCancelled() {
    	// don't do anything if query is cancelled.
    	// the previous visible Displayable will be 
    	// displayed automatically
    }
    
    
    public void destroyApp(boolean unconditional) {
    	Utils.ContentHandler p = getCurrentHandler();
    	if (p != null) {
	    p.close();
    	}
    }

    private Utils.ContentHandler getCurrentHandler() {
    	Displayable d = getDisplay().getCurrent();
    	if (d instanceof Utils.ContentHandler) {
	    return (Utils.ContentHandler) d;
    	}
    	return null;
    }
    
    // for debugging
    public String toString() {
    	return "SimplePlayer";
    }
    
}