PopupMenuButton控件即弹出菜单控件，点击控件会出现菜单。

import 'package:flutter/material.dart';class MenusDemo extends StatefulWidget { @override _MenusDemoState createState() => new _MenusDemoState();}class _MenusDemoState extends State<MenusDemo> { String _bodyStr = '显示菜单的点击'; @override Widget build(BuildContext context) { return new Scaffold( appBar: new AppBar( title: new Text('菜单演示'), actions: <Widget> [ new PopupMenuButton<String>( onSelected: (String value) { setState(() { _bodyStr = value; }); }, itemBuilder: (BuildContext context) => <PopupMenuItem<String>>[ new PopupMenuItem<String>( value: '选项一的值', child: new Text('选项一') ), new PopupMenuItem<String>( value: '选项二的值', child: new Text('选项二') ) ] ) ] ), body: new Center( child: new Text(_bodyStr) ) ); }}void main() { runApp(new MaterialApp( title: 'Flutter教程', home: new MenusDemo(), ));}

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