FlutterFlow and Withings integration: Step-by-Step Guide 2024

   

• Go to the Withings Developer Portal.
• Sign up for a developer account or log in if you already have one.
• Navigate to the My Applications section.
• Click the Create an application button.
• Fill out all required fields (App name, Description, etc.).
• Select the permissions you need (e.g., weight, heart rate).
• Provide a redirect URI for OAuth2 (e.g., https://www.yourapp.com/callback).
• Save the application details.
• Note down the Client ID and Client Secret as they will be needed for OAuth2 authentication.

 

• Go to your FlutterFlow project.
• Open the Project Settings.
• Navigate to the Pubspec tab.
• Add the following dependencies to handle API requests and authentication:

dependencies:
  http: ^0.13.3
  flutter\_dotenv: ^5.0.2
  oauth2: ^2.0.0

• Save the changes to update your project.

 

• Create a .env file in the root directory of your FlutterFlow project.
• Add your Withings Client ID and Client Secret:

WITHINGS_CLIENT_ID=your_client_id
WITHINGS_CLIENT_SECRET=your_client_secret
REDIRECT\_URI=https://www.yourapp.com/callback

 

• Create a Dart file called auth\_service.dart in your FlutterFlow project.
• Add the following code to handle the OAuth2 authentication flow:

import 'package:flutter_dotenv/flutter_dotenv.dart';
import 'package:http/http.dart' as http;
import 'package:oauth2/oauth2.dart' as oauth2;

class AuthService {
  final String clientId = dotenv.env['WITHINGS_CLIENT_ID']!;
  final String clientSecret = dotenv.env['WITHINGS_CLIENT_SECRET']!;
  final String redirectUri = dotenv.env['REDIRECT\_URI']!;

  final authorizationEndpoint = Uri.parse('https://account.withings.com/oauth2\_user/authorize2');
  final tokenEndpoint = Uri.parse('https://account.withings.com/oauth2/token');

  Future getClient() async {
    String? authorizationCode;

    // Logic for obtaining authorization code goes here
    // This involves directing the user to the authorizationEndpoint and getting back the authorization code

    final credentials = oauth2.AuthorizationCodeGrant(
      clientId,
      authorizationEndpoint,
      tokenEndpoint,
      secret: clientSecret,
    );

    final client = await credentials.handleAuthorizationResponse({'code': authorizationCode});
    
    return client;
  }
}

 

• Create a Dart file called withings\_service.dart.
• Add the following code to fetch health data:

import 'package:http/http.dart' as http;
import 'dart:convert';
import 'package:flutter_dotenv/flutter_dotenv.dart';

class WithingsService {
  final String accessToken;

  WithingsService(this.accessToken);

  Future> fetchHealthData() async {
    final response = await http.get(
      Uri.parse('https://wbsapi.withings.net/measure?action=getmeas&userid=your_user_id&meastype=1'), // example endpoint
      headers: {
        'Authorization': 'Bearer $accessToken',
      },
    );

    if (response.statusCode == 200) {
      return jsonDecode(response.body);
    } else {
      throw Exception('Failed to load health data');
    }
  }
}

 

• Create a new Dart file for your FlutterFlow page, for instance, health_data_page.dart.
• Fetch and display the data:

import 'package:flutter/material.dart';
import 'withings\_service.dart';
import 'auth\_service.dart';

class HealthDataPage extends StatefulWidget {
  @override
  _HealthDataPageState createState() => _HealthDataPageState();
}

class \_HealthDataPageState extends State {
  late Future> futureData;

  @override
  void initState() {
    super.initState();
    AuthService authService = AuthService();
    authService.getClient().then((client) {
      WithingsService withingsService = WithingsService(client.credentials.accessToken);
      setState(() {
        futureData = withingsService.fetchHealthData();
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Health Data'),
      ),
      body: FutureBuilder>(
        future: futureData,
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            return Center(child: CircularProgressIndicator());
          }

          if (snapshot.hasError) {
            return Center(child: Text('Error: ${snapshot.error}'));
          }

          if (!snapshot.hasData) {
            return Center(child: Text('No Data'));
          }

          var data = snapshot.data;
          return ListView.builder(
            itemCount: data['measurements'].length,
            itemBuilder: (context, index) {
              return ListTile(
                title: Text('Measurement ${index + 1}'),
                subtitle: Text(data\['measurements']\[index].toString()),
              );
            },
          );
        },
      ),
    );
  }
}

 

• Go back to your FlutterFlow project.
• Add a new page using the Components tab and select Custom.
• Import the health_data_page.dart by using FlutterFlow's Custom Code Import feature.
• Add a button on the main page to navigate to the Health Data Page.

 

• Build and run your FlutterFlow project.
• Navigate to the Health Data Page.
• Ensure the OAuth2 flow correctly authenticates with Withings and fetches the data.

By following these steps, you have integrated Withings with FlutterFlow to fetch and display health data in your application.