Flutter 嗯？显示的动画与android native中的动画不同。@chitgoks这可能是因为Flatter使用了自己的组件，而不是android拥有的本机视图元素。因此，可以使用RotateBox将三个点显示在堆栈中。EJ:RotatedBox（四分之一圈：1

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嗯？显示的动画与android native中的动画不同。@chitgoks这可能是因为Flatter使用了自己的组件，而不是android拥有的本机视图元素。因此，可以使用RotateBox将三个点显示在堆栈中。EJ:RotatedBox（四分之一圈：1，子项：PopupMenuButton（…））关于

RotatedBox

-非常有用，谢谢。在目前的测试中，我发现它只对iOS是必要的。@Ondrej如果某些菜单选项有一些子菜单选项，如何使用它？非常感谢，这对我的问题非常有帮助

import 'package:flutter/material.dart';
import 'package:settings_button/Constants.dart';
void main() => runApp(new MyApp());
class MyApp extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
        return new MaterialApp(
            title: 'Flutter Demo',
            theme: new ThemeData(
                primarySwatch: Colors.blue,)
            ,
            home: new MyHomePage(title: 'Flutter Demo Home Page'),);
    }

}
class MyHomePage extends StatefulWidget {
    MyHomePage({
        Key key, this.title
    })

        : super(key: key);
    final String title;
    @override
    _MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
    @override
    Widget build(BuildContext context) {
        return new Scaffold(
            appBar: new AppBar(
                title: new Text(widget.title),
                actions: <Widget>[
                    PopupMenuButton<String>(
                        onSelected: choiceAction,
                        itemBuilder: (BuildContext context){
                            return Constants.choices.map((String choice){
                                return PopupMenuItem<String>(
                                    value: choice,
                                    child: Text(choice),);
                            })
                                .toList();
                        }
                        ,)]
                ,)
            ,
            body: new Center(
                child: new Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: <Widget>[
                        new Text(
                            'Body',)
                        ,]
                    ,)
                ,)
            ,);
    }

    void choiceAction(String choice){
        if(choice == Constants.Settings){
            print('Settings');
        }
        else if(choice == Constants.Subscribe){
            print('Subscribe');
        }
        else if(choice == Constants.SignOut){
            print('SignOut');
        }
    }

}

class Constants{
  static const String fund = 'Fund';
//  static const String Settings = 'Settings';
  static const String SignOut = 'Sign out';

  static const List<String> choices = <String>[
    fund,`enter code here`
    SignOut
  ];
}

 appBar: AppBar(
        title: Text('Homepage'),
        actions: <Widget>[
          PopupMenuButton<String>(
            onSelected: handleClick,
            itemBuilder: (BuildContext context) {
              return {'Logout', 'Settings'}.map((String choice) {
                return PopupMenuItem<String>(
                  value: choice,
                  child: Text(choice),
                );
              }).toList();
            },
          ),
        ],
      ),

void handleClick(String value) {
    switch (value) {
      case 'Logout':
        break;
      case 'Settings':
        break;
    }
}

      PopupMenuButton(onSelected: menuAction, itemBuilder: (BuildContext itemBuilder) => {'Opt 1', 'Opt 2'}.map((value) => PopupMenuItem(child: Text(value), value: value,)).toList())

  void menuAction(String value) {
   switch (value) {  
    case 'Opt 1':
     print('Hello');
     break;
  }
}