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);
        }
    }
}