You cannot take a photo while recording a video only if the camera is locked () for recording

I am developing an application that can record video, take photos and while recording video you can take photos. For simple video recording and photography, I have no problem. The problem is when I start video recording and I try camera.takePicture(null, null, jpegCallback);

. On some devices, it never goes public void onPictureTaken(byte[] data, Camera camera){}

to mine PictureCallback jpegCallback

. I have checked for many hours and stackoverflow is my last hope to solve this problem.

At the beginning of the code in VideoRecordActivity

in, surfaceChanged()

I open and set the camera like this:

  camera = Camera.open();

  Camera.Parameters p = camera.getParameters();
  p.setPreviewSize(camcorderProfile.videoFrameWidth, camcorderProfile.videoFrameHeight);
  p.setPreviewFrameRate(camcorderProfile.videoFrameRate);

  camera.setParameters(p);
  camera.setPreviewDisplay(holder);
  camera.startPreview();

      

        
        
        
      

    

After that, I prepare MediaRecorder

as follows (I unlock the camera here because after I finish recording, I reconnect the camera with camera.reconnect()

and call again prepareRecorder()

and I can start recording the following video):

  private void prepareRecorder() {
    recorder = new MediaRecorder();

    camera.unlock();
    recorder.setCamera(camera);

    recorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT);
    recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT);
    recorder.setProfile(camcorderProfile);

    recorder.setPreviewDisplay(holder.getSurface());
  }

      

        
        
        
      

    

I cannot record video if mine is camera.unlock()

not called before recorder.setCamera(camera);

. But on some devices if I try takePicture()

while recording a video and after that camera.unlock()

it never gets overridden public void onPictureTaken(byte[] data, Camera camera)

. If I just comment camera.unlock()

and never start recording video in first place, but just the tab on the visible TakePhoto button, it works and takes pictures as usual. Any ideas why I can't take photos on some devices after starting video recording and unlocking () the camera?

I tested this on Android 4.4.2 - Samsung Galaxy Tab 4 10 "and 7". At 7 "I can take photos while recording, but at 10" I can't. Any ideas? Best regards, Vlad.