Flutter地区设置插件 region_settings 的使用

region_settings 是一个用于获取设备区域设置的Flutter插件，例如测量系统、温度单位和日期/数字格式。该插件支持Android和iOS平台。

平台支持

使用方法

要使用此插件，请在 pubspec.yaml 文件中添加 region_settings 作为依赖项：

dependencies:
  region_settings: ^latest_version

然后调用 RegionSettings.getSettings() 来访问设备的区域设置信息，包括温度单位、测量系统和日期/数字格式偏好。

示例代码

以下是一个完整的示例demo，展示了如何使用 region_settings 插件来获取和显示设备的区域设置信息。

import 'package:flutter/material.dart';
import 'package:intl/date_symbol_data_local.dart';
import 'package:intl/intl.dart';
import 'dart:async';
import 'package:region_settings/region_settings.dart';

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

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  [@override](/user/override)
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  TemperatureUnit? _temperatureUnits;
  bool? _usesMetricSystem;
  int? _firstDayOfWeek;
  String? _dateFormatShort;
  String? _dateFormatMedium;
  String? _dateFormatLong;
  String? _numberFormatInteger;
  String? _numberFormatDecimal;

  [@override](/user/override)
  void initState() {
    super.initState();
    loadRegionSettings();
  }

  Future<void> loadRegionSettings() async {
    final RegionSettings regionSettings = await RegionSettings.getSettings();
    TemperatureUnit temperatureUnits = regionSettings.temperatureUnits;
    bool usesMetricSystem = regionSettings.usesMetricSystem;
    int firstDayOfWeek = regionSettings.firstDayOfWeek;
    String dateFormatShort = regionSettings.dateFormat.short;
    String dateFormatMedium = regionSettings.dateFormat.medium;
    String dateFormatLong = regionSettings.dateFormat.long;
    String numberFormatInteger = regionSettings.numberFormat.integer;
    String numberFormatDecimal = regionSettings.numberFormat.decimal;

    // 初始化日期格式化
    await initializeDateFormatting();
    Intl.defaultLocale = await findSystemLocale();

    if (!mounted) return;

    setState(() {
      _temperatureUnits = temperatureUnits;
      _usesMetricSystem = usesMetricSystem;
      _firstDayOfWeek = firstDayOfWeek;
      _dateFormatShort = dateFormatShort;
      _dateFormatMedium = dateFormatMedium;
      _dateFormatLong = dateFormatLong;
      _numberFormatInteger = numberFormatInteger;
      _numberFormatDecimal = numberFormatDecimal;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('RegionSettings Example App'),
        ),
        body: SingleChildScrollView(
          child: Column(
            children: [
              Padding(
                padding: const EdgeInsets.all(10.0),
                child: GridView.count(
                  physics: const ScrollPhysics(),
                  crossAxisCount: 2,
                  childAspectRatio: 4.0,
                  shrinkWrap: true,
                  children: [
                    const Text('Temperature Units:'),
                    Text(
                      '$_temperatureUnits',
                      style: const TextStyle(fontWeight: FontWeight.bold),
                    ),
                    const Text('Uses Metric System:'),
                    Text(
                      '$_usesMetricSystem',
                      style: const TextStyle(fontWeight: FontWeight.bold),
                    ),
                    const Text('First Day of Week:'),
                    Text(
                      '$_firstDayOfWeek',
                      style: const TextStyle(fontWeight: FontWeight.bold),
                    ),
                    const Text('First Day is Monday:'),
                    Text(
                      '${_firstDayOfWeek == DateTime.monday}',
                      style: const TextStyle(fontWeight: FontWeight.bold),
                    ),
                    const Text('Date Format Short:'),
                    Text(
                      '$_dateFormatShort',
                      style: const TextStyle(fontWeight: FontWeight.bold),
                    ),
                    const Text('Today as Date Format Short:'),
                    Text(
                      DateFormat(_dateFormatShort).format(DateTime.now()),
                      style: const TextStyle(fontWeight: FontWeight.bold),
                    ),
                    const Text('Date Format Medium:'),
                    Text(
                      '$_dateFormatMedium',
                      style: const TextStyle(fontWeight: FontWeight.bold),
                    ),
                    const Text('Today as Date Format Medium:'),
                    Text(
                      DateFormat(_dateFormatMedium).format(DateTime.now()),
                      style: const TextStyle(fontWeight: FontWeight.bold),
                    ),
                    const Text('Date Format Long:'),
                    Text(
                      '$_dateFormatLong',
                      style: const TextStyle(fontWeight: FontWeight.bold),
                    ),
                    const Text('Today as Date Format Long:'),
                    Text(
                      DateFormat(_dateFormatLong).format(DateTime.now()),
                      style: const TextStyle(fontWeight: FontWeight.bold),
                    ),
                    const Text('Number Format Integer:'),
                    Text(
                      '$_numberFormatInteger',
                      style: const TextStyle(fontWeight: FontWeight.bold),
                    ),
                    const Text('Sample Integer:'),
                    Text(
                      _formatNumberWithPattern(
                        1234567,
                        _numberFormatInteger,
                      ),
                      style: const TextStyle(fontWeight: FontWeight.bold),
                    ),
                    const Text('Number Format Decimal:'),
                    Text(
                      '$_numberFormatDecimal',
                      style: const TextStyle(fontWeight: FontWeight.bold),
                    ),
                    const Text('Sample Decimal:'),
                    Text(
                      _formatNumberWithPattern(
                        1234567.89,
                        _numberFormatDecimal,
                        asDecimal: true,
                      ),
                      style: const TextStyle(fontWeight: FontWeight.bold),
                    ),
                  ],
                ),
              ),
              FilledButton.tonal(
                onPressed: () => loadRegionSettings(),
                child: const Text('Reload Values'),
              )
            ],
          ),
        ),
      ),
    );
  }

  String _formatNumberWithPattern(double number, String? pattern,
      {bool asDecimal = false}) {
    if (pattern == null) {
      return number.toString();
    }

    String numberStr =
        number.toStringAsFixed(asDecimal ? 2 : 0).replaceAll('.', '');

    assert(numberStr.length <= '#'.allMatches(pattern).length);

    String result = '';
    int numberIndex = numberStr.length - 1;
    for (int patternIndex = pattern.length - 1;
        patternIndex >= 0 && numberIndex >= 0;
        patternIndex--) {
      if (pattern[patternIndex] == '#') {
        result = '${numberStr[numberIndex]}$result';
        numberIndex--;
      } else {
        result = '${pattern[patternIndex]}$result';
      }
    }
    return result;
  }
}