Flutter插件frankfurter的使用_Frankfurter 是一个 Dart 库，用于使用 Frankfurter 货币转换服务

Flutter插件frankfurter的使用_Frankfurter 是一个 Dart 库，用于使用 Frankfurter 货币转换服务

Frankfurter 是一个 Dart 库，用于使用 Frankfurter 货币转换服务。Frankfurter 是一个开源 API，它利用欧洲中央银行定期更新货币转换率，并通过简单的 API 暴露这些比率。

默认情况下，此库使用 <https://www.frankfurter.app> API，但你可以部署你自己的 Frankfurter 实例并连接到该实例。

Flutter自定义功能插件frankfurter的使用

基于插件名称 “frankfurter” 的合理推测，这个插件可能用于货币转换。实际功能需要查阅官方文档或源码以获取详细信息。以下是一个完整的示例代码来展示如何使用 frankfurter 插件进行货币转换。

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text("Frankfurter Demo"),
        ),
        body: CurrencyConverter(),
      ),
    );
  }
}

class CurrencyConverter extends StatefulWidget {
  @override
  _CurrencyConverterState createState() => _CurrencyConverterState();
}

class _CurrencyConverterState extends State<CurrencyConverter> {
  final frankfurter = Frankfurter();
  String result = "";

  Future<void> fetchLatestRates() async {
    try {
      final latest = await frankfurter.latest(from: Currency('EUR'));
      setState(() {
        result = latest.toString();
      });
    } catch (e) {
      setState(() {
        result = "Error: $e";
      });
    }
  }

  Future<void> fetchConversionRate() async {
    try {
      final rate = await frankfurter.getRate(
        from: Currency('EUR'),
        to: Currency('GBP'),
      );
      setState(() {
        result = "Single conversion: $rate";
      });
    } catch (e) {
      setState(() {
        result = "Error: $e";
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          ElevatedButton(
            onPressed: fetchLatestRates,
            child: Text("Fetch Latest Rates"),
          ),
          SizedBox(height: 20),
          ElevatedButton(
            onPressed: fetchConversionRate,
            child: Text("Fetch Conversion Rate (EUR to GBP)"),
          ),
          SizedBox(height: 20),
          Text(result),
        ],
      ),
    );
  }
}

代码解释

• 导入必要的包:

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

• 创建应用主入口:

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

• 创建 MyApp 类:

  class MyApp extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
      return MaterialApp(
        home: Scaffold(
          appBar: AppBar(
            title: Text("Frankfurter Demo"),
          ),
          body: CurrencyConverter(),
        ),
      );
    }
  }
  

• 创建 CurrencyConverter 类:

  class CurrencyConverter extends StatefulWidget {
    @override
    _CurrencyConverterState createState() => _CurrencyConverterState();
  }
  

• 实现 _CurrencyConverterState 类:

  class _CurrencyConverterState extends State<CurrencyConverter> {
    final frankfurter = Frankfurter();
    String result = "";
  
    // 获取最新的汇率
    Future<void> fetchLatestRates() async {
      try {
        final latest = await frankfurter.latest(from: Currency('EUR'));
        setState(() {
          result = latest.toString();
        });
      } catch (e) {
        setState(() {
          result = "Error: $e";
        });
      }
    }
  
    // 获取从 EUR 到 GBP 的汇率
    Future<void> fetchConversionRate() async {
      try {
        final rate = await frankfurter.getRate(
          from: Currency('EUR'),
          to: Currency('GBP'),
        );
        setState(() {
          result = "Single conversion: $rate";
        });
      } catch (e) {
        setState(() {
          result = "Error: $e";
        });
      }
    }
  
    @override
    Widget build(BuildContext context) {
      return Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            ElevatedButton(
              onPressed: fetchLatestRates,
              child: Text("Fetch Latest Rates"),
            ),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: fetchConversionRate,
              child: Text("Fetch Conversion Rate (EUR to GBP)"),
            ),
            SizedBox(height: 20),
            Text(result),
          ],
        ),
      );
    }
  }