code: public void setFocusPoint(PointF focusPoint) {
      if (Objects.equal(mFocusPoint, focusPoint)) {
        return;
      }
  
      if (mFocusPoint == null) {
        mFocusPoint = new PointF();
      }
  
      mFocusPoint.set(focusPoint);
      configureBounds();
      invalidateSelf();
    }
docs: Sets the focus point.
  If ScaleType.FOCUS_CROP is used, focus point will attempted to be centered within a view.
  Each coordinate is a real number in [0,1] range, in the coordinate system where top-left
  corner of the image corresponds to (0, 0) and the bottom-right corner corresponds to (1, 1).
  @param focusPoint focus point of the image