使用SoundPool放声音

使用SoundPool放声音<wbr style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">在开发Android软件中我们可能经常需播放多媒体声音文件,一般使用</span><span style="color:#993300; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">MediaPlayer</span><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">类但该类占用资源较多,</span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">对于游戏等应用可能不是很适合,这里描述下</span><span style="color:#ff00ff; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">SoundPool</span><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">类。</span><span style="color:#ff6600; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">SoundPool</span><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">类在SDK的</span><span style="color:#0000ff; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">android.media.SoundPool</span><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">,</span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">顾名思义是声音池的意思。</span><wbr style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="color:#000080; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">主要播放一些较短的声音片段,可以从程序的资源或文件系统加载,<br> 相对于</span><span style="color:#993300; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">MediaPlayer</span><span style="color:#000080; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">类可以做到使用较少的CPU资源和较短的反应延迟。</span><wbr style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="color:#000080; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"></span><wbr style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="color:#ff00ff; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">SoundPool</span><span style="color:#000080; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">和其他声音播放类相比,其特点是可以自行设置声音的品质、音量、播放比率等参等。并且它可以同时管理多个音频流,<br> 每个流都有独自的ID,对某个音频流的管理都是通过ID进行的</span><wbr style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">。SoundPool基本使用方法为:</span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">创建一个SoundPool对象:</span><span style="color:#993300; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">new</span><span style="color:#0000ff; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">SoundPool(intmaxStreams,intstreamType,intsrcQuality);</span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">从资源或者文件载入音频流:</span><span style="color:#0000ff; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">load(Contextcontext,intresId,intpriority);</span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">播放声音</span><span style="color:#0000ff; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">play(intsoundID,floatleftVolume,floatrightVolume,intpriority,intloop,floatrate)</span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="color:#3366ff; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">privateSoundPoolsndPool;<br> privateHashMap&lt;String,Integer&gt;sndPoolMap=newHashMap&lt;String,Integer&gt;();<br> finalstaticintkSoundMin=R.raw.b1;<br> finalstaticintkSoundMax=R.raw.gameover;<br> finalstaticintkSoundNum=kSoundMax-kSoundMin+1;<br></span><span style="color:#993300; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">publicvoid</span><span style="color:#3366ff; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">loadAllSounds()<br> {<br> if(sndPool==null)<br> sndPool=newSoundPool(kSoundNum,AudioManager.STREAM_SYSTEM,5);<br> for(inti=kSoundMin;i&lt;=kSoundMax;i++){<br> loadSound(i);<br> }<br> }<br></span><span style="color:#993300; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">publicvoid</span><span style="color:#3366ff; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">loadSound(intid)<br> {<br> Stringkey=""+id;<br> if(sndPoolMap.containsKey(key))<br> {<br> System.out.println("Waring!thesound"+id+"hasbeenloaded");<br> return;<br> }<br> intindex=sndPool.load(this.getContext(),id,1);<br> sndPoolMap.put(""+id,index);<br> }<br></span><span style="color:#993300; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">publicvoid</span><span style="color:#3366ff; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">playSound(intid)<br> {<br> intindex=sndPoolMap.get(""+id);<br> sndPool.play(index,1,1,0,0,1);<br> }<br></span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">这样我们就可以使用SoundPool简单的播放一个声音了。相信不少朋友已经想试一试了,</span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">可是SoundPool并非尽善尽美的。就现在已知的资料来说,SoundPool有一些设计上的BUG,从固件版本1.0开始有些都没有修复,</span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">我们在使用中应该小心再小心。相信将来Google会修复这些问题,但我们最好还是列出来:</span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)"></span><wbr style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">1.</span><span style="color:#000080; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">SoundPool最大只能申请1M的内存空间</span><wbr style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">,这就意味着我们只能用一些很短的声音片段,</span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">而不是用它来播放歌曲或者做游戏背景音乐。</span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)"></span><span style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><wbr>2.</wbr></span><span style="color:#000080; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">SoundPool提供了pause和stop方法,但这些方法建议最好不要轻易使用</span><wbr style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">,</span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">因为有些时候它们可能会使你的程序莫名其妙的终止。</span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">Android开发网建议使用这两个方法的时候尽可能多做测试工作,还有些朋友反映它们不会立即中止播放声音,</span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">而是把缓冲区里的数据播放完才会停下来,也许会多播放一秒钟。</span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)"></span><span style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><wbr>3.</wbr></span><span style="color:#000080; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">SoundPool的效率问题。其实SoundPool的效率在这些播放类中算是很好的了</span><wbr style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">,</span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">但是有的朋友在G1中测试它还是有100ms左右的延迟,这可能会影响用户体验。</span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">也许这不能管SoundPool本身,因为到了性能比较好的Droid中这个延迟就可以让人接受了。</span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; line-height:25px; text-align:left; background-color:rgb(245,245,245)">在现阶段SoundPool有这些缺陷,但也有着它不可替代的优点,基于这些我们建议大在如下情况中多使用SoundPool:</span><br style="line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)"><span style="color:#000080; line-height:25px; font-family:Arial,Helvetica,simsun,u5b8bu4f53; font-size:14px; text-align:left; background-color:rgb(245,245,245)">1.应用程序中的声效(按键提示音,消息等)<br> 2.游戏中密集而短暂的声音(如多个飞船同时爆炸),当然大家还可以想到更多的使用方法。</span><br></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>

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