如果某个具体的Widget不希望直接使用全局的Theme，而希望自己来定义，只需要在Widget的父节点包裹一下Theme即可.

在新的页面的Scaffold外，包裹了一个Theme，并且设置data为一个新的ThemeData.

class HYSecondPage extends StatelessWidget {@overrideWidget build(BuildContext context) {return Theme(data: ThemeData(),child: Scaffold(),);}
}

完整代码:

class _MyHomePageState extends State<MyHomePage> {int _counter = 0;void _incrementCounter() {setState(() {_counter++;});}var themechange = ThemeData.light();@overrideWidget build(BuildContext context) {return Theme(data:themechange,child: Scaffold(appBar: AppBar(title: Text(widget.title),),body: Center(child: Column(mainAxisAlignment: MainAxisAlignment.center,children: <Widget>[FlatButton(child: Text("theme", style: TextStyle(color: Colors.black)),onPressed: () {(themechange == ThemeData.dark())?(themechange = ThemeData.light()):(themechange = ThemeData.dark());setState(() {});},
), Text('You have pushed the button this many times:',),Text('$_counter',style: Theme.of(context).textTheme.headline4,),],),),floatingActionButton: FloatingActionButton(onPressed: _incrementCounter,tooltip: 'Increment',child: Icon(Icons.add),), ),);}
}