Flutter货币转换插件to_currency的使用

发布于 1周前 作者 sinazl 来自 Flutter

Flutter货币转换插件to_currency的使用

安装to_currency插件

首先,你需要从pub.dev安装to_currency插件。在终端中运行以下命令:

flutter pub add to_currency

使用示例

下面是一个完整的Flutter应用示例,展示了如何使用to_currency插件进行货币格式化。这个示例包括了如何将金额转换为不同的货币格式,并在UI中显示这些格式化的金额。

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

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

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

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  [@override](/user/override)
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
            // 使用toCFA函数将1000转换为CFA格式
            Text(
              toCFA(1000), // 输出:2 000 F CFA
              style: Theme.of(context).textTheme.headlineMedium,
            ),
            // 使用toUSD函数将-1000转换为USD格式
            Text(
              toUSD(-1000), // 输出:-1000 USD
              style: Theme.of(context).textTheme.headlineMedium,
            ),
            // 使用toDollar函数将-1000.5转换为美元格式,保留两位小数
            Text(
              toDollar(-1000.5, decimalDigits: 2), // 输出:$-1000.50
              style: Theme.of(context).textTheme.headlineMedium,
            ),
            // 使用toCurrency函数自定义货币格式
            Text(
              toCurrency(
                amount: 1000000, // 金额
                currency: "XOF", // 货币代码
                currencyPrefixed: false, // 是否在金额前加上货币符号
                separator: ".", // 千位分隔符
                decimalSeparator: ",", // 小数点分隔符
                decimalDigits: 2, // 小数位数
              ), // 输出:1.000.000,00 XOF
              style: Theme.of(context).textTheme.headlineMedium,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}

更多关于Flutter货币转换插件to_currency的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html

1 回复

更多关于Flutter货币转换插件to_currency的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html


当然,下面是一个关于如何在Flutter应用中使用to_currency插件进行货币转换的代码示例。这个插件可以帮助你将一种货币转换为另一种货币。

首先,确保你已经在你的pubspec.yaml文件中添加了to_currency依赖:

dependencies:
  flutter:
    sdk: flutter
  to_currency: ^x.y.z  # 请替换为最新版本号

然后运行flutter pub get来安装依赖。

接下来,你可以在你的Flutter应用中按照以下步骤使用to_currency插件:

  1. 导入插件
import 'package:to_currency/to_currency.dart';
  1. 初始化并配置插件
void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: CurrencyConversionScreen(),
    );
  }
}
  1. 创建一个屏幕来显示转换结果
import 'package:flutter/material.dart';
import 'package:to_currency/to_currency.dart';

class CurrencyConversionScreen extends StatefulWidget {
  @override
  _CurrencyConversionScreenState createState() => _CurrencyConversionScreenState();
}

class _CurrencyConversionScreenState extends State<CurrencyConversionScreen> {
  final TextEditingController _amountController = TextEditingController();
  final TextEditingController _fromCurrencyController = TextEditingController(text: 'USD');
  final TextEditingController _toCurrencyController = TextEditingController(text: 'EUR');
  String _convertedAmount = '';

  void _convertCurrency() async {
    double amount = double.tryParse(_amountController.text) ?? 0.0;
    String fromCurrency = _fromCurrencyController.text.toUpperCase();
    String toCurrency = _toCurrencyController.text.toUpperCase();

    ToCurrency toCurrency = ToCurrency();
    double convertedAmount = await toCurrency.convert(
      amount: amount,
      from: fromCurrency,
      to: toCurrency,
    );

    setState(() {
      _convertedAmount = convertedAmount.toStringAsFixed(2);
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Currency Converter'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            TextField(
              controller: _amountController,
              decoration: InputDecoration(labelText: 'Amount'),
              keyboardType: TextInputType.number,
            ),
            SizedBox(height: 16.0),
            TextField(
              controller: _fromCurrencyController,
              decoration: InputDecoration(labelText: 'From Currency'),
            ),
            SizedBox(height: 16.0),
            TextField(
              controller: _toCurrencyController,
              decoration: InputDecoration(labelText: 'To Currency'),
            ),
            SizedBox(height: 32.0),
            ElevatedButton(
              onPressed: _convertCurrency,
              child: Text('Convert'),
            ),
            SizedBox(height: 16.0),
            Text(
              'Converted Amount: $_convertedAmount',
              style: TextStyle(fontSize: 20.0, fontWeight: FontWeight.bold),
            ),
          ],
        ),
      ),
    );
  }
}

在这个示例中,我们创建了一个简单的Flutter应用,用户可以输入金额、源货币和目标货币,然后点击“Convert”按钮进行转换。转换后的金额会显示在页面上。

注意:

  • to_currency插件可能依赖于外部API来获取最新的汇率数据,因此在实际应用中,你可能需要处理API请求失败的情况。
  • 汇率数据可能会随时间变化,因此转换结果可能不是实时的。

希望这个示例对你有所帮助!

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