class MyList extends StatelessWidget {  Widget build(BuildContext context) {    //动态加载数量    return new ListView.builder(        itemCount: 10,        itemBuilder: (context, i) {          print(i);          return new ListTile(            leading: new Icon(Icons.map),          );        });    //只能给定内容//   return new ListView(children: 
    
     [//     new ListTile(leading: new Icon(Icons.map))//   ],);  }}