在flutter中单击浮动动作按钮时添加新小部件

class FloatingActionButtonWidget extends StatefulWidget {
  @override
  _FloatingActionButtonWidgetState createState() =>
      _FloatingActionButtonWidgetState();
}

class _FloatingActionButtonWidgetState
    extends State<FloatingActionButtonWidget> {
  @override
  Widget build(BuildContext context) {
    return FloatingActionButton(
      onPressed: () {
        // 在这里添加你想要执行的操作
        setState(() {
          // 添加新小部件的代码
        });
      },
      child: Icon(Icons.add),
    );
  }
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Flutter App'),
        ),
        body: Center(
          child: Text('Hello, World!'),
        ),
        floatingActionButton: FloatingActionButtonWidget(),
      ),
    );
  }
}