当区域设置(语言更改)时强制Flutter PopupMenuButton重绘

import 'package:flutter/material.dart';
import 'package:intl/intl.dart';

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  String _currentLocale = '';

  @override
  void initState() {
    super.initState();
    _getCurrentLocale();
  }

  void _getCurrentLocale() async {
    var locale = await findSystemLocale();
    setState(() {
      _currentLocale = locale;
    });
  }

  void _handleLocaleChange() {
    // Handle locale change here
    // Update PopupMenuButton's state
    setState(() {
      // Update PopupMenuButton's state here
      // For example, update menu options or label text
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('My App'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text('Current Locale: $_currentLocale'),
            PopupMenuButton(
              itemBuilder: (BuildContext context) {
                return [
                  PopupMenuItem(
                    child: Text('Option 1'),
                    value: 1,
                  ),
                  PopupMenuItem(
                    child: Text('Option 2'),
                    value: 2,
                  ),
                ];
              },
              onSelected: (value) {
                // Handle menu item selection here
              },
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _handleLocaleChange,
        child: Icon(Icons.language),
      ),
    );
  }
}