防采集标记：亢少军老师的课程和资料

import 'package:flutter/material.dart';
class LayoutDemo extends StatelessWidget {@overrideWidget build(BuildContext context) {return new Scaffold(appBar: new AppBar(title: new Text('ConstrainedBox限定宽高示例'),),body: new ConstrainedBox(constraints: const BoxConstraints(minWidth: 150.0,minHeight: 150.0,maxWidth: 220.0,maxHeight: 220.0,),child: new Container(width: 300.0,height: 300.0,color: Colors.green,),),);}
}
void main() {runApp(new MaterialApp(title: 'ConstrainedBox限定宽高示例',home: new LayoutDemo(),),);
}

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@作者: 亢少军