flutter 颜色渐变

class _home extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _homeState();
  }
}
class _homeState extends State<_home> {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return new Scaffold(
        appBar: new AppBar(
          title: Text("title"),
          centerTitle: true,
        ),
        body: new Center(
          child: new Container(
              height: 200.0,
              decoration: new BoxDecoration(
                  gradient: const LinearGradient(
                      colors: [Colors.amberAccent, Colors.lightBlue, Colors.red]),
                border: Border.all(width: 5.0,color: Colors.green)

              ),
          ),
        )
    );
  }