Bottom App Bar Top Edge Treatment
Parameters
fab Margin
the margin in pixels between the cutout and the fab.
rounded Corner Radius
the radius, in pixels, of the rounded corners created by the cutout. A value of 0 will produce a sharp cutout.
cradle Vertical Offset
vertical offset, in pixels, of the FloatingActionButton being cradled. An offset of 0 indicates the vertical center of the is positioned on the top edge.