Camera.Parameters.setZoom() is inconsistent across devices, in some device it zooms more

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I am making a custom camera app, and I am using the Android Camera API for that. I know this API is deprecated now and it is recommended to use the Camera2 API. But I have to only preview the camera with some zoom.

Below is the code for setting the zoom

Camera.Parameters parameters = camera.getParameters();
 parameters.setZoom(30);
  parameters.setPreviewFpsRange(
                previewFpsRange[Camera.Parameters.PREVIEW_FPS_MIN_INDEX],
                previewFpsRange[Camera.Parameters.PREVIEW_FPS_MAX_INDEX]);
  parameters.setPreviewFormat(IMAGE_FORMAT);
 camera.setParameters(parameters);

Now, the problem is that the camera zoom is not equal across devices, some devices zoom in to a good amount whereas some devices zoom very much.

I am not able to find any explanation over the internet regarding the same.

I need the same zoom level across all the Android devices irrespective of the camera quality and MP.

camera-calibration android-camera zooming android
1 Answers

The legal Value of Camera.Parameters.setZoom() goes from 0 to Camera.Parameters.getMaxZoom() as you can read in the Documentation of setZoom()

What you have to do is to normalize the Zoom factor over all devices, which can be done with the following method:

 private setZoom(float zoom) {//to me, here zoom 0 to 1 
 try {
    if (isCameraOpened() && mCameraParameters.isZoomSupported()) {
        int maxZoom = mCameraParameters.getMaxZoom();
        int scaledValue = (int) (zoom * maxZoom);
        mCameraParameters.setZoom(scaledValue);
        mZoom = zoom;
        mCamera.setParameters(mCameraParameters);
    }
  } catch (Exception | Error throwable) {
    Log.e(TAG, Objects.requireNonNull(throwable.getMessage()));
  }
}
user_93261660
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