Use Supabase with Flutter

1. Create a Supabase project#

Before you can use Supabase, you need a Supabase project. You can create a project visually in the Dashboard or programmatically using the Management API.

2. Set up your database#

When your Supabase project is up and running, create an instruments table with some sample data.

Then set a secure baseline by setting only the privileges each Postgres role needs, add Row Level Security (RLS) for enhanced security for database data by default, and create an RLS policy to make the data in your table publicly readable.

You can click this button to prefill all the SQL needed in the SQL editor of your project in the Dashboard.

3. Create a Flutter app#

Create a Flutter app using the flutter create command.

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flutter create my_app

4. Install the Supabase client library#

The fastest way to get started is to use the supabase_flutter client library which provides a convenient interface for working with Supabase from a Flutter app.

Open the pubspec.yaml file inside your Flutter app and add supabase_flutter as a dependency.

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supabase_flutter: ^2.0.0

Get API details#

To interact with data in database tables, you use the client libraries that wrap the auto-generated Data API endpoints, authenticating using the Project URL and key from the project Connect dialog.

5. Initialize the Supabase client#

Open lib/main.dart and edit the main function to initialize Supabase using your project URL and publishable key, which you can get from the helper above, or from the project Connect panel:

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import 'package:supabase_flutter/supabase_flutter.dart';
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Future<void> main() async {
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  WidgetsFlutterBinding.ensureInitialized();
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  await Supabase.initialize(
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    url: 'YOUR_SUPABASE_URL',
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    publishableKey: 'YOUR_SUPABASE_PUBLISHABLE_KEY',
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  );
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  runApp(MyApp());
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}

6. Query data from the app#

Use a FutureBuilder to fetch the data when the home page loads and display the query result in a ListView.

Replace the default MyApp and MyHomePage classes with the following code.

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class MyApp extends StatelessWidget {
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  const MyApp({super.key});
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  @override
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  Widget build(BuildContext context) {
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    return const MaterialApp(
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      title: 'Instruments',
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      home: HomePage(),
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    );
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  }
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}
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class HomePage extends StatefulWidget {
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  const HomePage({super.key});
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  @override
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  State<HomePage> createState() => _HomePageState();
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}
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class _HomePageState extends State<HomePage> {
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  final _future = Supabase.instance.client
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      .from('instruments')
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      .select();
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  @override
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  Widget build(BuildContext context) {
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    return Scaffold(
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      body: FutureBuilder(
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        future: _future,
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        builder: (context, snapshot) {
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          if (!snapshot.hasData) {
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            return const Center(child: CircularProgressIndicator());
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          }
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          final instruments = snapshot.data!;
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          return ListView.builder(
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            itemCount: instruments.length,
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            itemBuilder: ((context, index) {
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              final instrument = instruments[index];
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              return ListTile(
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                title: Text(instrument['name']),
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              );
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            }),
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          );
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        },
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      ),
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    );
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  }
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}

7. Start the app#

Run your app on a platform of your choosing! By default an app should launch in your web browser.

Note that supabase_flutter is compatible with web, iOS, Android, macOS, and Windows apps. Running the app on macOS requires additional configuration to set the entitlements.

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flutter run

Setup deep links#

Many sign in methods require deep links to redirect the user back to your app after authentication. Read more about setting deep links up for all platforms (including web) in the Flutter Mobile Guide.

Going to production#

Android#

In production, your Android app needs explicit permission to use the internet connection on the user's device which is required to communicate with Supabase APIs. To do this, add the following line to the android/app/src/main/AndroidManifest.xml file.

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<manifest xmlns:android="http://schemas.android.com/apk/res/android">
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  <!-- Required to fetch data from the internet. -->
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  <uses-permission android:name="android.permission.INTERNET" />
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  <!-- ... -->
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</manifest>