class AndroidPluginCallback : AndroidJavaProxy
    {
        public AndroidPluginCallback() : base("com.example.android.PluginCallback") { }

        public void onSuccess(string videoPath) {
            Debug.Log("ENTER callback onSuccess: " + videoPath);
        }
        public void onError(string errorMessage)
        {
            Debug.Log("ENTER callback onError: " + errorMessage);
        }
    }