Flutter入门-03MaterialApp风格组件

class Hello extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Center(
      child: Text(
        ‘hello‘,
        textDirection: TextDirection.ltr,
        style: TextStyle(
          fontSize: 100.0,
          fontWeight: FontWeight.bold,
          color: Colors.blue,
        ),
      )
    );
  }
}

class App extends StatelessWidget{
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      home()
    );
  }
}