使用下面的代码
Row(children: <Widget>[
Expanded(
child: new Container(
margin: const EdgeInsets.only(left: 10.0, right: 20.0),
child: Divider(
color: Colors.black,
height: 36,
)),
),
Text("OR"),
Expanded(
child: new Container(
margin: const EdgeInsets.only(left: 20.0, right: 10.0),
child: Divider(
color: Colors.black,
height: 36,
)),
),
]),