Flutter设置部分主题

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        // 设置主题属性
        primaryColor: Colors.blue,
        accentColor: Colors.red,
        textTheme: TextTheme(
          bodyText2: TextStyle(fontSize: 16.0),
        ),
        buttonTheme: ButtonThemeData(
          buttonColor: Colors.green,
          minWidth: 100.0,
        ),
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter App'),
      ),
      body: Center(
        child: Text(
          'Hello, World!',
          style: Theme.of(context).textTheme.bodyText2,
        ),
      ),
      floatingActionButton: FloatingActionButton(
        child: Icon(Icons.add),
        onPressed: () {},
      ),
    );
  }
}