Building a Flutter Mobile App with Supabase Integration

Introduction to Supabase

Supabase is an open-source alternative to Firebase that provides a suite of backend services, including databases, authentication, and real-time capabilities. In this article, we'll explore how to create a Flutter mobile app with null safety and integrate it with Supabase for seamless data storage and authentication.

Setting Up Your Flutter Null Safety Project

1. Create a new Flutter project with null safety enabled:

   flutter create my_supabase_app

1. Navigate to the project directory:

   cd my_supabase_app

1. Open the pubspec.yaml file and add the necessary dependencies:

   dependencies:
     flutter:
       sdk: flutter
     supabase_flutter: ^0.4.1 # Supabase SDK for Flutter

1. Run flutter pub get to install the dependencies.

Initializing Supabase

In your main.dart file, initialize Supabase with your Supabase URL and API key:

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return SupabaseProvider(
      url: 'YOUR_SUPABASE_URL',
      anonKey: 'YOUR_SUPABASE_ANON_KEY',
      child: MaterialApp(
        title: 'Supabase App',
        home: HomeScreen(),
      ),
    );
  }
}

Authenticating with Supabase

Implement user authentication using Supabase in your HomeScreen:

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

class HomeScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final supabase = Supabase.instance.client;
    final session = supabase.auth.currentSession;

    return Scaffold(
      appBar: AppBar(
        title: Text('Supabase App'),
      ),
      body: Center(
        child: session?.accessToken != null
            ? Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Text('You are logged in!'),
                  ElevatedButton(
                    onPressed: () async {
                      await supabase.auth.signOut();
                    },
                    child: Text('Sign Out'),
                  ),
                ],
              )
            : ElevatedButton(
                onPressed: () async {
                  final response = await supabase.auth.signIn(
                    ProviderCredentials.anonymous(),
                  );
                  if (response.error == null) {
                    print('Logged in anonymously');
                  } else {
                    print('Error: ${response.error?.message}');
                  }
                },
                child: Text('Log In Anonymously'),
              ),
      ),
    );
  }
}

Storing Data with Supabase

You can easily interact with Supabase's database using the supabase_flutter package. Here's an example of how to insert data into a table:

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

class DataScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final supabase = Supabase.instance.client;

    Future<void> insertData() async {
      final response = await supabase.from('data').upsert([
        {
          'id': 1,
          'name': 'John Doe',
          'email': '[e-mail]',
        },
      ]).execute();
      if (response.error == null) {
        print('Data inserted successfully');
      } else {
        print('Error: ${response.error?.message}');
      }
    }

    return Scaffold(
      appBar: AppBar(
        title: Text('Data Screen'),
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: () async {
            await insertData();
          },
          child: Text('Insert Data'),
        ),
      ),
    );
  }
}

Conclusion: Empower Your Flutter App with Supabase

Integrating Supabase with your Flutter null safety mobile app empowers you to build robust and feature-rich applications. By utilizing Supabase's authentication and database capabilities, you can create user-friendly and efficient apps that store data securely and provide a seamless user experience.

This article merely scratches the surface of what you can achieve with Supabase and Flutter. Dive deeper into Supabase's features, including real-time capabilities, triggers, and more, to further enhance your app's functionality.

Feel free to reach out to me on Twitter @gideonsalamii for more insights into building powerful Flutter apps with Supabase.

Happy coding!