Camera Preview Surface

public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
    private SurfaceHolder mHolder;
    private Camera mCamera;
    private List<Camera.Size> mSupportedPreviewSizes;
    private Camera.Size mPreviewSize;
    private int mCameraId;

    public CameraPreview(Context context) {
        super(context);
        mHolder = getHolder();
        mHolder.addCallback(this);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        final int width = resolveSize(getSuggestedMinimumWidth(), widthMeasureSpec);
        final int height = resolveSize(getSuggestedMinimumHeight(), heightMeasureSpec);
        if (mSupportedPreviewSizes != null) {
            mPreviewSize = CameraUtils.getOptimalPreviewSize(mSupportedPreviewSizes, width, height);
        }
        if (mPreviewSize != null) {
            float ratio = mPreviewSize.height >= mPreviewSize.width
                    ? (float) mPreviewSize.height / (float) mPreviewSize.width
                    : (float) mPreviewSize.width / (float) mPreviewSize.height;

            // One of these methods should be used, second method squishes preview slightly
            setMeasuredDimension(width, (int) (width * ratio));
            //        setMeasuredDimension((int) (width * ratio), height);
        } else {
            setMeasuredDimension(width, height);
        }

    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        try {
            try {
                releaseCamera();
                mCameraId = CameraUtils.getFrontCameraId();
                mCamera = Camera.open(mCameraId > 0 ? mCameraId : 0); //todo to separate thread?
            } catch (Exception e) {
                e.printStackTrace();
            }
            mSupportedPreviewSizes = mCamera.getParameters().getSupportedPreviewSizes();

            CameraUtils.setCameraDisplayOrientation(getContext(), mCameraId, mCamera);
            mCamera.setPreviewDisplay(holder);
            mCamera.startPreview();
            requestLayout();
        } catch (IOException e) {
            Timber.e("Camera error on surfaceCreated", e);
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        if (mHolder.getSurface() == null) {
            return;
        }

        try {
            mCamera.stopPreview();
        } catch (Exception e) {
        }

        //now, recreate the camera preview
        try {
            if (mPreviewSize != null) {
                Camera.Parameters parameters = mCamera.getParameters();
                parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
                mCamera.setParameters(parameters);
            }

            mCamera.setPreviewDisplay(mHolder);
            mCamera.startPreview();
        } catch (Exception e) {
            Timber.e("Camera error on surfaceChanged ", e);
        }
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        mCamera.stopPreview();
        releaseCamera();
    }

    private void releaseCamera() {
        if (mCamera != null) {
            mCamera.release();
            mCamera = null;
        }
    }
}