cocos2d-x 同时播放多个音效的时候，会发现有的音效放不出，有的循环音效放着放着就没了
后来发现猫腻在Cocos2dxSound.java里：
privatestaticfinalintMAX_SIMULTANEOUS_STREAMS_DEFAULT=5;
SoundPool构造的时候要指定并发音频流的数量
publicSoundPool(int maxStreams,int streamType,int srcQuality)
Added inAPI level 1
This constructor was deprecated in API level 21.
useSoundPool.Builderinstead to create and configure a SoundPool instance
Constructor. Constructs a SoundPool object with the following characteristics:
Parameters
| maxStreams | the maximum number of simultaneous streams for this SoundPool object |
|---|---|
| streamType | the audio stream type as described in AudioManager For example,game applications will normally useSTREAM_MUSIC. |
| srcQuality | the sample-rate converter quality. Currently has no effect. Use 0 for the default. |
Returns
a SoundPool object,or null if creation Failed
这里cocos2d-x设置成5了（I9100设成3），可以手动改大一点，来解决问题
版本：cocos2d-x 3.0
