import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter/foundation.dart' show kIsWeb;
void createShortcut(BuildContext context) {
  if (!kIsWeb && (Platform.isAndroid || Platform.isIOS)) {
    const platform = MethodChannel('plugins.flutter.io/shared_preferences');
    final String result = await platform.invokeMethod('createShortcut');
  }
}

showMenu(
  context: context,
  position: RelativeRect.fromLTRB(
      details.globalPosition.dx,
      details.globalPosition.dy,
      0,
      0
  ),
  items: <PopupMenuEntry>[
    const PopupMenuItem(child: Text('操作一')),
    const PopupMenuItem(child: Text('操作二')),
    const PopupMenuItem(child: Text('操作三')),
  ],
);

PopupMenuButton(
  itemBuilder: (BuildContext context) =>
      <PopupMenuEntry>[
    const PopupMenuItem(child: Text('操作一')),
    const PopupMenuItem(child: Text('操作二')),
    const PopupMenuItem(child: Text('操作三')),
  ],
  onSelected: (result) {
    switch (result) {
      case '操作一':
        // 執(zhí)行操作一的代碼
        break;
      case '操作二':
        // 執(zhí)行操作二的代碼
        break;
      case '操作三':
        // 執(zhí)行操作三的代碼
        break;
    }
  },
)

import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          title: const Text('操作項(xiàng)面板示例程序'),
        ),
        body: const Center(
          child: Text(
            '長(zhǎng)按圖標(biāo)以展示操作項(xiàng)面板',
          ),
        ),
        floatingActionButton: FloatingActionButton(
          onPressed: () {
            createShortcut(context);
          },
          tooltip: '創(chuàng)建桌面圖標(biāo)',
          child: const Icon(Icons.add),
        ),
      ),
    );
  }
  Future<void> createShortcut(BuildContext context) async {
    showDialog(
        context: context,
        builder: (BuildContext context) => AlertDialog(
              title: const Text("創(chuàng)建操作項(xiàng)面板"),
              content: const Text("長(zhǎng)按圖標(biāo)以展示操作項(xiàng)面板"),
              actions: <Widget>[
                TextButton(
                  onPressed: () {
                    Navigator.pop(context);
                  },
                  child: const Text("取消"),
                ),
              ],
            ));
    // 操作項(xiàng)面板
    final result = await showMenu(
      context: context,
      position: RelativeRect.fromLTRB(0, 0, 0, 0),
      items: <PopupMenuEntry>[
        const PopupMenuItem(child: Text('操作一')),
        const PopupMenuItem(child: Text('操作二')),
        const PopupMenuItem(child: Text('操作三')),
      ],
    );
    switch (result) {
      case '操作一':
        // 執(zhí)行操作一的代碼
        break;
      case '操作二':
        // 執(zhí)行操作二的代碼
        break;
      case '操作三':
        // 執(zhí)行操作三的代碼
        break;
    }
  }
}