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我正在编写代码以在分析帧后录制视频。如果帧包含高于 240 的红度级别，则它开始录制或红度低于 230 停止视频录制。

但问题是，当媒体记录器开始录制时，Camera.PreviewCallback 的onPreviewFrame方法停止为我的 android 设备Redmi note 7 pro的自定义 android OS MIUI 工作。

我的代码如下

private Camera.PreviewCallback previewCallback = new Camera.PreviewCallback() {

       /**
        * {@inheritDoc}
        */
       @Override
       public void onPreviewFrame(byte[] data, Camera cam) {
           if (data == null) throw new NullPointerException();
           Camera.Size size = cam.getParameters().getPreviewSize();
           if (size == null) throw new NullPointerException();


           int width = size.width;
           int height = size.height;

           // decodeYUV420SPtoRedAvg function to find redness lavel of frame 
           int imgAvg = ImageProcessing.decodeYUV420SPtoRedAvg(data.clone(), height, width);
           Log.i(TAG, "imgAvg=" + imgAvg);
           if (imgAvg == 0 || imgAvg == 255) {
               return;
           }

           if (isRecording) {
               long diffInMs = new Date(System.currentTimeMillis()).getTime() - startTime;
               Log.i(TAG, imgAvg + " imgAvg diffInMs1=" + diffInMs);

               mProgressBar.setProgress((int) diffInMs);
               if (diffInMs >= recordingMS + 1000) {
                   stopRecording();
                   i = 0;
                   mProgressBar.setVisibility(View.GONE);
                   tvStatingCount.setVisibility(View.GONE);
               }
               tvStatingCount.setText(getString(R.string.reading_started_please_hold_your_finger_steady_for_one_minute) + imgAvg);
           } else {
               mProgressBar.setVisibility(View.GONE);
               tvStatingCount.setVisibility(View.VISIBLE);
               tvStatingCount.setText(getString(R.string.please_place_your_finger_over_your_rear_camera_to_start_the_readingt) + imgAvg);
           }

           if (imgAvg > 240) {
               if (!isRecording) {
                   starRecording();
                   i = 0;
                   mProgressBar.setProgress(0);
                   mProgressBar.setVisibility(View.VISIBLE);
                   tvStatingCount.setText(getString(R.string.reading_started_please_hold_your_finger_steady_for_one_minute) + imgAvg);
               }
           } else {
               if (isRecording && imgAvg < 230) {
                   stopRecording();
               }
               /*mProgressBar.setVisibility(View.GONE);
               tvStatingCount.setText(getString(R.string.please_place_your_finger_over_your_rear_camera_to_start_the_readingt, imgAvg));*/
           }
       }
   };

该代码适用于本机 Android 版本。在设备 moto，Samsung 中测试代码。

所以任何人都可以帮助我找出解决方案？

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