你可以使用它this way https://docs.flutter.io/flutter/painting/ShapeBorder-class.html
Card(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(15.0),
),
child: Text(
'Card with circular border',
textScaleFactor: 1.2,
),
),
Card(
shape: BeveledRectangleBorder(
borderRadius: BorderRadius.circular(10.0),
),
child: Text(
'Card with Beveled border',
textScaleFactor: 1.2,
),
),
Card(
shape: StadiumBorder(
side: BorderSide(
color: Colors.black,
width: 2.0,
),
),
child: Text(
'Card with Stadium border',
textScaleFactor: 1.2,
),
),