1、Center介绍

Center将子控件放在其内部中心，里面只能放一个child，但是child里面可以放Container

Center继承勒Align，然后Align默认是center.

 

 

 

 

 

 

 

 

2、测试代码

测试1、

  @overrideWidget build(BuildContext context) {return MaterialApp(title: 'open url',home: Scaffold(appBar: AppBar(// Here we take the value from the MyHomePage object that was created by// the App.build method, and use it to set our appbar title.title: Text('hello flutter'),),body: Center(child: Text("chenyu"),),),);}
}

 

 

 

 

 

测试2、

  @overrideWidget build(BuildContext context) {return MaterialApp(title: 'open url',home: Scaffold(appBar: AppBar(// Here we take the value from the MyHomePage object that was created by// the App.build method, and use it to set our appbar title.title: Text('hello flutter'),),body: Center(child: Container(color: Colors.blue,width: 200,height: 200,),),),);}
}

 

 

 

 

 

 

3、运行结果

测试1效果、

 

 

 

测试2效果、