Flutter showDatePicker将一周的第一天设置为星期一

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

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      localizationsDelegates: [
        GlobalMaterialLocalizations.delegate,
        GlobalWidgetsLocalizations.delegate,
      ],
      supportedLocales: [
        const Locale('en', 'US'), // English
        const Locale('zh', 'CN'), // Chinese
      ],
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  DateTime selectedDate = DateTime.now();

  Future<void> _selectDate(BuildContext context) async {
    final DateTime? picked = await showDatePicker(
      context: context,
      initialDate: selectedDate,
      firstDate: DateTime(1900),
      lastDate: DateTime(2100),
      locale: const Locale('zh', 'CN'), // 设置为中文
      builder: (BuildContext context, Widget? child) {
        return Theme(
          data: ThemeData.light().copyWith(
            primaryColor: Colors.blue, // 设置主题颜色
            accentColor: Colors.blue, // 设置选中颜色
            colorScheme: ColorScheme.light(primary: Colors.blue), // 设置颜色方案
            buttonTheme: ButtonThemeData(
              textTheme: ButtonTextTheme.primary, // 设置按钮文本颜色
            ),
          ),
          child: child!,
        );
      },
    );
    if (picked != null && picked != selectedDate)
      setState(() {
        selectedDate = picked;
      });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter showDatePicker'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'Selected Date:',
              style: TextStyle(fontSize: 20),
            ),
            Text(
              '${selectedDate.year}-${selectedDate.month}-${selectedDate.day}',
              style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
            ),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: () => _selectDate(context),
              child: Text('Select Date'),
            ),
          ],
        ),
      ),
    );
  }
}