Flutter质感设计之弹出菜单

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 {
 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:  [
     new PopupMenuButton(
      onSelected: (String value) {
setState(() {
 _bodyStr = value;
});
      },
      itemBuilder: (BuildContext context) => >[
new PopupMenuItem(
 value: '选项一的值',
 child: new Text('选项一')
),
new PopupMenuItem(
 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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