Android 移动终端camera 防偷*拍设置
目前市面上的所有移动终端几乎都有camera应用，但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原生frameworks/base/services/camera/libcameraservice/cameraservice.cpp中playSound函数即可，修改后的方法如下：
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(AudioSystem::ENFORCED_AUDIBLE, &index);
??????? if (index != 0) {
??????? ??? ? AudioSystem::setStreamVolumeIndex(AudioSystem::ENFORCED_AUDIBLE,index);
??????????? player->seekTo(0);
??????????? player->start();
??????? } else {
??????? ??? ??? AudioSystem::setStreamVolumeIndex(AudioSystem::ENFORCED_AUDIBLE,7);
??? ??? ??? ??? ??? ??? player->seekTo(0);
??? ??? ??? ??? ??? ??? player->start();
??? ??? ??? ??? ??? ??? usleep(300000);
??? ??? ??? ??? ??? ??? AudioSystem::setStreamVolumeIndex(AudioSystem::ENFORCED_AUDIBLE,0);
??????? }
??? }
}
