How to implement a multi-currency support system in FlutterFlow?

Implementing Multi-Currency Support in a FlutterFlow App

Creating a multi-currency support system in a FlutterFlow app involves a combination of FlutterFlow's UI capabilities and custom logic to handle currency conversion and display. Below is a detailed guide on how to implement this feature.

Prerequisites

• A FlutterFlow account with an active project where you want to implement multi-currency support.
• Basic knowledge of FlutterFlow's environment and widget manipulation.
• Access to a reliable currency conversion API, such as Open Exchange Rates or Forex API.

Setting Up Your FlutterFlow Project

• Log in to your FlutterFlow account and open the project where you want to add currency support.
• Navigate to the widget tree to plan the user interface for displaying and selecting currencies.

Designing the Currency Selector UI

• In your widget tree, create a dropdown or a segmented control for currency selection. This will allow users to choose their preferred currency.
• Ensure the currency options are clearly labeled with both the currency code and symbol for ease of use.

Implementing Currency Conversion Logic

• Since FlutterFlow doesn’t natively handle currency conversion, use a Custom Action to integrate external currency converter APIs.
• In your FlutterFlow project, create a custom function where you will write Dart code to interact with the currency API.
• Use HTTP requests to fetch conversion rates from your chosen currency API. Example:

  <pre>
  import 'dart:convert';
  import 'package:http/http.dart' as http;
  
  Future&lt;double&gt; fetchConversionRate(String fromCurrency, String toCurrency) async {
    final response = await http.get(Uri.parse('https://api.exchangerate-api.com/v4/latest/$fromCurrency'));
  
    if (response.statusCode == 200) {
      final rates = json.decode(response.body)['rates'];
      return rates[toCurrency];
    } else {
      throw Exception('Failed to load conversion rates');
    }
  }
  </pre>
  

Linking the UI with Conversion Logic

• Ensure the currency selector interacts with your custom function. Use the selected currency as input to fetch the conversion rate.
• When a user selects a currency, call the custom function to update currency conversions dynamically based on real-time data from the API.

Displaying Converted Currency Values

• Create a display widget in your UI to show the converted amounts. Update these widgets to reflect the converted value based on user selection.
• Bind the conversion result from your custom function to the text widget showing the price or amount in the selected currency.

Handling Edge Cases

• Account for scenarios where the API fails or returns an error by implementing error-checking logic in your Dart code.
• Provide a fallback mechanism, such as a default conversion rate or an alert to the user, when API calls are unsuccessful.

Testing and Debugging

• Use FlutterFlow’s preview mode to test currency selection and conversion. Verify accuracy and responsiveness of conversions under different network conditions.
• Utilize console outputs and the debugger to trace issues if the conversion results are incorrect or not displaying.

Deploying Your Multi-Currency App

• Perform extensive testing across various devices and scenarios to ensure consistent performance before deploying.
• Package the app ensuring all custom actions and API keys are correctly configured for production use.

By following this guide, you can implement a robust multi-currency support system in your FlutterFlow app, enhancing user experience by enabling them to view prices in their preferred currency. This approach leverages external API support for real-time conversion and a smooth UI-driven currency selection process.