google music / 巨鲸音乐 读取例子

       想学习一下别人是怎么做音乐播放的，就想到的最火的Google Music和巨鲸音乐网，Google music听说是购买了巨鲸音乐的版权，一开始以为里面的播放器程序应该都差不多，但其实还是有很多不同。于是做了个AIR的例子，效果如下：

 

 

 

      点左边的“华语热歌”可以在Google Music上列出对应的歌曲列表，右边可以在巨鲸音乐上搜一些歌曲。

      双击歌曲就可以进行播放，从截图上可以看见，对于同一首歌曲显示的URL是不同的。

      这个AIR程序大家有兴趣可以改成flash，区别就是要做一个proxy去读取查询信息。

      暂时使用中发现歌曲搜索的时候有50%的几率是播放不出音乐的，有兴趣的朋友可以看看源代码看怎么修复这个问题。

 

      里面的播放管理Class写得不错，覆盖了常用的MP3播放的功能，如调节音量，播放/停止，从某个位置播放等等，只要加个UI就可以实现MP3播放器了。代码示例粘贴如下：

     package org.cnflex.music.google { import flash.events.*; import flash.media.*; import flash.net.*; public class MusicPlay extends flash.events.EventDispatcher { public function MusicPlay() { super(); context = new SoundLoaderContext(BUFFER_TIME, true); song = new Sound(); songChannel = new SoundChannel(); isPlaying = false; isLoading = false; pausePosition = -1; return; } public function getMusicURL():String { return musicURL; } private function onSongOpen(arg1:flash.events.Event):void { dispatchEvent(new PlaylistEvent(PlaylistEvent.SONG_OPENED, null, true)); return; } public function getPausePosition():int { return pausePosition; } public function getVolume():Number { return songChannel.soundTransform.volume; } public function getDuration():Number { return song.length; } private function syncVolume():void { var loc1:*; loc1 = null; if (songChannel == null) { return; } loc1 = songChannel.soundTransform; loc1.volume = volume; songChannel.soundTransform = loc1; return; } public function getLoadingStatus():Boolean { return isLoading; } public function getSongLen():Number { var loc1:*; loc1 = NaN; loc1 = getLoadedPercent(); if (loc1 > 0) { return getDuration() / loc1; } return 0; } public function loadSong(arg1:String):void { var loc2:*; loc2 = null; musicURL = arg1; loc2 = new URLRequest(arg1); if (songChannel != null) { songChannel.stop(); } if (isLoading == true) { song.close(); } song = new Sound(); song.addEventListener(Event.OPEN, onSongOpen, false, 0, true); song.addEventListener(IOErrorEvent.IO_ERROR, onIOError, false, 0, true); song.addEventListener(Event.ID3, traceMusicInfo, false, 0, true); song.addEventListener(Event.COMPLETE, songLoadComplete, false, 0, true); song.addEventListener(ProgressEvent.PROGRESS, progressHandler, false, 0, true); isLoading = true; song.load(loc2, context); songChannel = song.play(); isPlaying = true; stopSong(); return; } public function setVolume(arg1:Number):void { volume = arg1; syncVolume(); return; } public function getPosition():Number { if (songChannel == null) { return 0; } return songChannel.position; } public function getID3Info():flash.media.ID3Info { return song.id3; } private function traceMusicInfo(arg1:flash.events.Event):void { dispatchEvent(arg1); return; } public function stopSong():void { pausePosition = songChannel.position; songChannel.stop(); isPlaying = false; return; } public function playSongAtPos(arg1:Number=0):void { var loc2:*; var loc3:*; var position:Number=0; position = arg1; songChannel.stop(); try { songChannel = song.play(position); } catch (error:Error) { trace(undefined); } isPlaying = true; syncVolume(); songChannel.addEventListener(Event.SOUND_COMPLETE, songComplete, false, 0, true); return; } public function closeSong():void { songChannel.stop(); pausePosition = 0; isPlaying = false; return; } private function onIOError(arg1:flash.events.IOErrorEvent):void { trace("the song couldn/'t be loaded" + arg1.text); isLoading = false; song.close(); dispatchEvent(new PlaylistEvent(PlaylistEvent.STATUS, MessageText.SONG_LOAD_FAILED, true)); dispatchEvent(new PlaylistEvent(PlaylistEvent.SONG_LOAD_FAILED, null, true)); return; } public function hasMusicURL(arg1:String):Boolean { if (!(arg1 == null) && !(arg1 == "")) { return true; } return false; } public function isSongPlaying():Boolean { return isPlaying; } public function songChannelExisted():Boolean { return !(songChannel == null); } public function getLoadedPercent():Number { var loc1:*; loc1 = NaN; loc1 = 0; if (song.bytesLoaded >= 0 && song.bytesTotal > 0) { loc1 = song.bytesLoaded / song.bytesTotal; } return loc1; } private function progressHandler(arg1:flash.events.ProgressEvent):void { return; } public function playSong():void { playSongAtPos(pausePosition); return; } private function songComplete(arg1:flash.events.Event):void { dispatchEvent(arg1); return; } private function songLoadComplete(arg1:flash.events.Event):void { isLoading = false; dispatchEvent(new PlaylistEvent(PlaylistEvent.STATUS, MessageText.SONG_LOADED, true)); return; } public static const BUFFER_TIME:int=5000; private var musicURL:String; private var volume:Number; private var isPlaying:Boolean; private var song:flash.media.Sound; private var songChannel:flash.media.SoundChannel; private var context:flash.media.SoundLoaderContext; private var isLoading:Boolean; private var pausePosition:int; } }

 

     奇怪，优快云怎么上传附件的？

     AIR项目下载，下载后导入Flex Builder即可。