目前市面上的所有移动终端几乎都有camera应用，但Android.html">Android原生系统在静音模式下拍照是没有声音的，大部分国家的终端都有法规限制，如防止偷*拍，不管什么模式下拍照都应该发出快门音，针对此问题只要修改Android.html">Android原生cameraservice.cpp中playSound函数即可，
?? android 4.0.3声音分类
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typedef enum { AUDIO_STREAM_DEFAULT = -1, AUDIO_STREAM_VOICE_CALL = 0, AUDIO_STREAM_SYSTEM = 1, AUDIO_STREAM_RING = 2, AUDIO_STREAM_MUSIC = 3, AUDIO_STREAM_ALARM = 4, AUDIO_STREAM_NOTIFICATION = 5, AUDIO_STREAM_BLUETOOTH_SCO = 6, AUDIO_STREAM_ENFORCED_AUDIBLE = 7, /* Sounds that cannot be muted byuser and must be routed to speaker */ AUDIO_STREAM_DTMF = 8, AUDIO_STREAM_TTS = 9, AUDIO_STREAM_FM = 10, AUDIO_STREAM_MATV = 11, AUDIO_STREAM_BOOT = 12, //only used for bootanimationand output from speaker and headset AUDIO_STREAM_CNT, AUDIO_STREAM_MAX = AUDIO_STREAM_CNT - 1,} audio_stream_type_t;??
?? 修改后的方法如下：
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void cameraService::playSound(sound_kind kind) { LOG1("playSound(%d)", kind); Mutex::Autolock lock(mSoundLock); sp<MediaPlayer> player = mSoundPlayer[kind]; if (player != 0) { // do not play the sound if stream volume is 0 // (typically because ringer mode is silent). int index; AudioSystem::getStreamVolumeIndex(AUDIO_STREAM_ENFORCED_AUDIBLE, &index); if (index != 0) { AudioSystem::setStreamVolumeIndex(AUDIO_STREAM_ENFORCED_AUDIBLE,index); player->seekTo(0); player->start(); } else { AudioSystem::setStreamVolumeIndex(AUDIO_STREAM_ENFORCED_AUDIBLE,7); player->seekTo(0); player->start(); usleep(300000); AudioSystem::setStreamVolumeIndex(AUDIO_STREAM_ENFORCED_AUDIBLE,0); } }}