public void SetUpRecoder()
 {
     try
     {
         if (null == activity)
         {
             return;
         }
         if (userResponse == UserResponse.Video)
         {
             mediaRecorder = new MediaRecorder();
             mediaRecorder.Reset();
             mediaRecorder.SetAudioSource(AudioSource.Mic);
             mediaRecorder.SetVideoSource(VideoSource.Surface);
             mediaRecorder.SetOutputFormat(OutputFormat.Mpeg4);
             mediaRecorder.SetOutputFile(path + "/test.mp4");
             mediaRecorder.SetVideoEncodingBitRate(10000000);
             mediaRecorder.SetVideoFrameRate(30);
             mediaRecorder.SetVideoSize(videoSize.Width, videoSize.Height);
             mediaRecorder.SetVideoEncoder(VideoEncoder.H264);
             mediaRecorder.SetAudioEncoder(AudioEncoder.Aac);
             //int rotation = (int)activity.WindowManager.DefaultDisplay.Rotation;
             //int orientation = ORIENTATIONS.Get(rotation);
             if (LensFacing == CameraFacing.BACK)
             {
                 mediaRecorder.SetOrientationHint(90);
             }
             else
             {
                 mediaRecorder.SetOrientationHint(270);
             }
             mediaRecorder.SetMaxDuration(30000);
             mediaRecorder.Prepare();
         }
         else
         {
             mediaRecorder = new MediaRecorder();
             mediaRecorder.Reset();
             mediaRecorder.SetAudioSource(AudioSource.Mic);
             mediaRecorder.SetOutputFormat(OutputFormat.ThreeGpp);
             mediaRecorder.SetAudioEncoder(AudioEncoder.AmrNb);
             mediaRecorder.SetOutputFile(path + "/test.mp3");
             mediaRecorder.SetMaxDuration(30000);
             mediaRecorder.Prepare();
         }
     }
     catch (System.Exception ex)
     {
     }
 }