使用cwac-library使用前置摄像头的图像没有exif数据

Question

我使用cwac-library构建了自定义相机应用程序。我正在尝试访问使用前置摄像头捕获的图像的exif数据，但是像TAG_GPS_LATITUDE，TAG_GPS_LATITUDE_REF，TAG_GPS_LONGITUDE，TAG_GPS_LONGITUDE_REF，TAG_MAKE，TAG_MODEL ..这样的exif标记返回null。只有标签工作是TAG_DATETIME。这仅适用于使用前置摄像头拍摄的照片，每个标签都可以完美地返回使用后置摄像头

拍摄的图像的值

使用前置摄像头时我遗失的任何东西？

包括代码

  

自定义相机片段类

   public class CustomCameraFragment extends CameraFragment {
      static CustomCameraFragment newInstance() {
       return new CustomCameraFragment();
      }

  @Override
  public void onCreate(Bundle state) {
    super.onCreate(state);
    SimpleCameraHost.Builder builder = new SimpleCameraHost.Builder(new CustomCameraHost(getActivity()));
    builder.useFullBleedPreview(true);
    builder.useFrontFacingCamera(true);
    builder.mirrorFFC(true);
    setHost(builder.build());
  }

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View cameraView = super.onCreateView(inflater, container, savedInstanceState);
    View fragmentView = inflater.inflate(R.layout.camera_fragment, container, false);
    FrameLayout cameraPreview = (FrameLayout)fragmentView.findViewById(R.id.camera_preview);
    ((ViewGroup)cameraPreview).addView(cameraView);
    return fragmentView;
  }
}

  

自定义相机主机类

public class CustomCameraHost extends SimpleCameraHost {
      public CustomCameraHost(Activity activity) {
        super(activity);
      }

      @Override
      public Parameters adjustPictureParameters(PictureTransaction xact, Parameters parameters) {
        Location location = LocationUtils.getLastKnownLocation();
        parameters.setGpsLatitude(location.getLatitude());
        parameters.setGpsLongitude(location.getLongitude());
        parameters.setGpsProcessingMethod(location.getProvider().toUpperCase());
        if (location.hasAltitude()) {
         parameters.setGpsAltitude(location.getAltitude());
        } else {
         parameters.setGpsAltitude(0);
        }
        if (location.getTime() != 0) {
        // Location.getTime() is UTC in milliseconds. Gps-timestamp is UTC in seconds.
        long utcTimeSeconds = location.getTime() / 1000;
        parameters.setGpsTimestamp(utcTimeSeconds);
      }
      return super.adjustPictureParameters(xact, parameters);
    }
  }