// Use this for initialization
    void Start()
    {
        // 全局单例来维护
        VoiceMgr.Init();
        VoiceMgr.SetCallback(OnResult);
        VoiceMgr.SetSpeakerErrorCallback(OnSpeechError);
        VoiceMgr.SetFlyJsonCallback(OnFlyJsonResult);
        VoiceMgr.SetSpeakerCallback(OnSpeakerCompleted);
        //VoiceMgr.SetOnVolumeCallback (OnMicroPhoneVolumeChanged);

        VoiceMgr.SetParameter("engine_type", "cloud");
        VoiceMgr.SetParameter("audio_format", "pcm");
    }