connection_notifier

Connection Notifier

A simple way to notify your user about the connection status as well as providing simple tools that help tracking the internet connection status.

Version 4.0+: Now with injectable connectivity handlers, full Navigator 2.0 support, Web support, and seamless support for modern routing solutions. Version 4.1+: Added async connectivity check via ConnectionNotifierTools.isConnectedAsync.

Gallery

Quick Start

Basic Usage (Without Localization)

If you don't need localization, simply wrap your MaterialApp:

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

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await ConnectionNotifierTools.initialize();
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return GlobalConnectionNotifier(
      connectionNotificationOptions: ConnectionNotificationOptions(
        alignment: Alignment.topCenter,
      ),
      child: MaterialApp(
        title: 'My App',
        home: const MyHomePage(),
      ),
    );
  }
}

Recommended Usage (With Localization)

This is the recommended approach if you're using any localization package (EasyLocalization, flutter_localizations, intl, etc.):

Call ConnectionNotifierTools.initialize(...) once in main() before runApp(...), same as the basic usage example.

import 'package:connection_notifier/connection_notifier.dart';
import 'package:easy_localization/easy_localization.dart'; // or your localization package
import 'package:flutter/material.dart';

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      locale: context.locale,
      supportedLocales: context.supportedLocales,
      localizationsDelegates: context.localizationDelegates,
      builder: (context, child) => GlobalConnectionNotifier(
        connectionNotificationOptions: ConnectionNotificationOptions(
          alignment: Alignment.bottomCenter,
          // Now you can use localized strings with context!
          connectedText: 'connectionRestored'.tr(context: context),
          disconnectedText: 'connectionLost'.tr(context: context),
        ),
        child: child!,
      ),
      home: const MyHomePage(),
    );
  }
}

Why use the builder approach?

• ✅ Full access to localization context
• ✅ Messages automatically update when language changes
• ✅ Works with EasyLocalization, flutter_localizations, intl, and all localization packages
• ✅ Clean and maintainable code

That's it! Connection notifications will work throughout your entire app with full localization support.

✅ Platform Support

Works everywhere:

• ✅ iOS
• ✅ Android
• ✅ Web
• ✅ macOS
• ✅ Windows
• ✅ Linux

✅ Navigation Support

Works with ALL navigation types:

• ✅ Classic Navigator (Navigator 1.0)
• ✅ Navigator 2.0 (GoRouter, AutoRoute, Beamer, and all modern routing solutions)

Example with GoRouter

import 'package:go_router/go_router.dart';

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  final _router = GoRouter(
    routes: [
      GoRoute(path: '/', builder: (context, state) => const HomePage()),
      GoRoute(path: '/details', builder: (context, state) => const DetailsPage()),
    ],
  );

  @override
  Widget build(BuildContext context) {
    return GlobalConnectionNotifier(
      connectionNotificationOptions: ConnectionNotificationOptions(
        alignment: Alignment.topCenter,
      ),
      child: MaterialApp.router(
        title: 'My App',
        routerConfig: _router,
      ),
    );
  }
}

Configuration

ConnectionNotificationOptions Parameters

Option	Description	Type	Default Value	Required
alignment	Alignment of the connection notification	AlignmentGeometry	AlignmentDirectional.topCenter	No
height	Height of the connection notification	double?	twice top padding	No
width	Width of the connection notification	double?	double.infinity	No
borderRadius	Border radius of the connection notification	BorderRadiusGeometry?	null	No
connectedBackgroundColor	Background color in connected state	Color?	Colors.green	No
disconnectedBackgroundColor	Background color in disconnected state	Color?	Colors.red	No
connectedDuration	Duration before auto-dismissing in connected state	Duration?	2 seconds	No
disconnectedDuration	Duration before auto-dismissing in disconnected state	Duration?	infinity	No
overlayAnimationType	Animation type of the notification	OverlayAnimationType	OverlayAnimationType.fadeAndSlide	No
animationCurve	Animation curve	Curve?	Curves.fastOutSlowIn	No
animationDuration	Animation duration	Duration?	300 milliseconds	No
connectedContent	Custom widget for connected state	Widget?	null	No
disconnectedContent	Custom widget for disconnected state	Widget?	null	No
shouldAlwaysPullContentDownOnTopAlignment	Pull content down on top alignment	bool	true	No
hasIndicationIcon	Show indication icon in default content	bool	true	No
textAndIconSeparationWidth	Distance between text and icon	double?	10	No
connectedText	Text for connected state	String?	'Back Online'	No
disconnectedText	Text for disconnected state	String?	'Retrying'	No
connectedTextStyle	Text style for connected state	TextStyle?	null	No
disconnectedTextStyle	Text style for disconnected state	TextStyle?	null	No
connectedIcon	Icon for connected state	Icon?	Icon(Icons.check)	No
disconnectedIcon	Icon for disconnected state	Icon?	CircularProgressIndicator	No
iconBoxSideLength	Size of the icon box	double?	10	No
connectedConnectionNotification	Custom notification widget for connected state	Widget?	null	No
disconnectedConnectionNotification	Custom notification widget for disconnected state	Widget?	null	No

Custom Notification Example

GlobalConnectionNotifier(
  connectionNotificationOptions: ConnectionNotificationOptions(
    alignment: Alignment.topCenter,
    connectedConnectionNotification: Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Colors.green,
        borderRadius: BorderRadius.circular(8),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          const Icon(Icons.wifi, color: Colors.white),
          const SizedBox(width: 8),
          const Text('Connected', style: TextStyle(color: Colors.white)),
        ],
      ),
    ),
    disconnectedConnectionNotification: Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Colors.red,
        borderRadius: BorderRadius.circular(8),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          const Icon(Icons.wifi_off, color: Colors.white),
          const SizedBox(width: 8),
          const Text('No Connection', style: TextStyle(color: Colors.white)),
        ],
      ),
    ),
  ),
  child: MaterialApp(home: MyHomePage()),
)

Localization

Recommended Approach: Use MaterialApp Builder (Best Practice)

The easiest and most powerful way to handle localization is using the MaterialApp builder pattern. This gives you full access to the localization context:

import 'package:connection_notifier/connection_notifier.dart';
import 'package:easy_localization/easy_localization.dart'; // or any localization package
import 'package:flutter/material.dart';

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      locale: context.locale,
      supportedLocales: context.supportedLocales,
      localizationsDelegates: context.localizationDelegates,
      // Use the builder to access localization context
      builder: (context, child) => GlobalConnectionNotifier(
        connectionNotificationOptions: ConnectionNotificationOptions(
          alignment: Alignment.bottomCenter,
          // Access localized strings with full context support
          connectedText: 'connectionRestored'.tr(context: context),
          disconnectedText: 'connectionLost'.tr(context: context),
        ),
        child: child!,
      ),
      home: const MyHomePage(),
    );
  }
}

Benefits:

• ✅ Works with any localization package (EasyLocalization, flutter_localizations, intl, etc.)
• ✅ Messages automatically update when language changes
• ✅ Full access to localization context
• ✅ Clean and maintainable
• ✅ No need for custom widgets or manual locale detection

Alternative: Custom Notification Widgets

If you need more control over the UI, create custom widgets:

GlobalConnectionNotifier(
  connectionNotificationOptions: ConnectionNotificationOptions(
    connectedConnectionNotification: MyLocalizedConnectedWidget(),
    disconnectedConnectionNotification: MyLocalizedDisconnectedWidget(),
  ),
  child: MaterialApp(...),
)

class MyLocalizedConnectedWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final String message = 'connectionRestored'.tr(context: context);
    
    return Container(
      padding: EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Colors.green,
        borderRadius: BorderRadius.circular(8),
      ),
      child: Text(message, style: TextStyle(color: Colors.white)),
    );
  }
}

Additional Widgets

ConnectionNotifierToggler

Toggle between widgets based on connection state:

ConnectionNotifierToggler(
  onConnectionStatusChanged: (connected) {
    if (connected == null) return; // Still initializing
    print(connected);
  },
  connected: Center(
    key: UniqueKey(),
    child: const Text(
      'Connected',
      style: TextStyle(color: Colors.green, fontSize: 48),
    ),
  ),
  disconnected: Center(
    key: UniqueKey(),
    child: const Text(
      'Disconnected',
      style: TextStyle(color: Colors.red, fontSize: 48),
    ),
  ),
);

LocalConnectionNotifier

Show connection notification for a specific screen only:

class MyScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return LocalConnectionNotifier(
      connectionNotificationOptions: const ConnectionNotificationOptions(
        alignment: Alignment.bottomCenter,
      ),
      child: Scaffold(
        appBar: AppBar(title: const Text('My Screen')),
        body: Center(child: Text('Content')),
      ),
    );
  }
}

ConnectionNotifierTools

Check connection status programmatically anywhere in your app:

First, initialize:

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await ConnectionNotifierTools.initialize();
  runApp(const MyApp());
}

Then use:

// Check if connected (synchronous, last known status)
bool isConnected = ConnectionNotifierTools.isConnected;

// Async live check — use when you need a guaranteed up-to-date result,
// since isConnected may briefly hold stale data during a connection change.
bool isOnline = await ConnectionNotifierTools.isConnectedAsync;

// Listen to connection changes
ConnectionNotifierTools.onStatusChange.listen((isConnected) {
  print('Connection status: $isConnected');
});

Custom Connection Handler (Inject Your Own Connectivity Source)

The package is agnostic to how connectivity is detected. By default it uses ConnectionNotifierHandlerImpl (internet_connection_checker_plus). If you have your own source (socket, native SDK, etc.), implement ConnectionHandler and pass it to ConnectionNotifierTools.initialize(...).

import 'package:connection_notifier/connection_notifier.dart';

class MySocketConnectionHandler implements ConnectionHandler {
  @override
  Stream<ConnectionNotifierInternetConnectionStatus> get onStatusChange =>
      mySocketStatusStream.map((isOnline) {
        return isOnline
            ? ConnectionNotifierInternetConnectionStatus.connected
            : ConnectionNotifierInternetConnectionStatus.disconnected;
      });

  @override
  Future<bool> get hasInternetAccess async => mySocketIsConnected;
}

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await ConnectionNotifierTools.initialize(
    connectionHandler: MySocketConnectionHandler(),
  );
  runApp(const MyApp());
}

The package UI reacts to the handler stream. No manual notification API calls are required.

Migration Guide

From v3.x to v4.0

Version 4.0 introduces breaking changes. Please read below.

What's Changed:

1. Removed pauseConnectionListenerWhenAppInBackground — Background/foreground lifecycle is now managed internally
2. Injectable ConnectionHandler support — Bring your own connectivity source
3. Automatic, stable reconnect flow — App pauses in background, resumes with 3s delay in foreground

Migration Steps:

Step 1: Remove pauseConnectionListenerWhenAppInBackground

If you were using this option, simply remove it:

// ❌ Before (v3.0):
GlobalConnectionNotifier(
  connectionNotificationOptions: ConnectionNotificationOptions(
    alignment: Alignment.topCenter,
    pauseConnectionListenerWhenAppInBackground: true, // ← REMOVE THIS
  ),
  child: MaterialApp(...),
)

// ✅ After (v4.0):
GlobalConnectionNotifier(
  connectionNotificationOptions: ConnectionNotificationOptions(
    alignment: Alignment.topCenter,
    // Background/foreground is handled automatically now
  ),
  child: MaterialApp(...),
)

Step 2: (Optional) Use custom connectivity source

New in v4.0: bring your own connectivity handler:

class MyCustomHandler implements ConnectionHandler {
  @override
  Stream<ConnectionNotifierInternetConnectionStatus> get onStatusChange {
    // Your custom connectivity source
    return myCustomConnectivityStream;
  }

  @override
  Future<bool> get hasInternetAccess async {
    // Your custom connectivity check
    return myCustomCheckInternet();
  }
}

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await ConnectionNotifierTools.initialize(
    connectionHandler: MyCustomHandler(), // ← Inject your handler
  );
  runApp(const MyApp());
}

Behavior Changes:

Behavior	v3.0	v4.0
Background handling	Optional, manual via option	Always active, automatic
Resume delay	None	3 seconds (for OS to settle)
Status deduplication	No	Yes (same status ignored)
Custom connectivity	No	Yes, via ConnectionHandler injection

---

From v2.x to v3.0

See CHANGELOG.md for detailed migration instructions.

Quick Migration:

Before (v2.x):

ConnectionNotifier(
  locale: const Locale('en', 'US'),
  supportedLocales: [Locale('en', 'US')],
  localizationsDelegates: [...],
  connectionNotificationOptions: ConnectionNotificationOptions(...),
  child: MaterialApp(
    home: MyHomePage(),
  ),
)

After (v3.0):

GlobalConnectionNotifier(
  connectionNotificationOptions: ConnectionNotificationOptions(...),
  child: MaterialApp(
    locale: const Locale('en', 'US'),
    supportedLocales: [Locale('en', 'US')],
    localizationsDelegates: [...],
    home: MyHomePage(),
  ),
)

Migration Steps:

1. Replace ConnectionNotifier with GlobalConnectionNotifier
2. Move locale properties to MaterialApp: locale, supportedLocales, localizationsDelegates, etc.
3. Keep connectionNotificationOptions in GlobalConnectionNotifier
4. Handle localization using one of the methods described in the Localization section
5. Test your app!

Complete Example

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

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await ConnectionNotifierTools.initialize();
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return GlobalConnectionNotifier(
      connectionNotificationOptions: ConnectionNotificationOptions(
        alignment: Alignment.topCenter,
        height: 60,
        connectedBackgroundColor: Colors.green,
        disconnectedBackgroundColor: Colors.red,
        connectedText: 'Back Online!',
        disconnectedText: 'No Internet Connection',
        connectedDuration: const Duration(seconds: 3),
      ),
      child: MaterialApp(
        title: 'Connection Notifier Demo',
        theme: ThemeData(primarySwatch: Colors.blue),
        home: const MyHomePage(),
      ),
    );
  }
}

class MyHomePage extends StatelessWidget {
  const MyHomePage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Connection Notifier Demo')),
      body: ConnectionNotifierToggler(
        connected: Center(
          child: const Text(
            'Connected',
            style: TextStyle(color: Colors.green, fontSize: 48),
          ),
        ),
        disconnected: Center(
          child: const Text(
            'Disconnected',
            style: TextStyle(color: Colors.red, fontSize: 48),
          ),
        ),
      ),
    );
  }
}

Attribution

This package depends on the following (Big Thanks):

• internet_connection_checker_plus
• rxdart

More from the Developer

Check out my other open-source project:

• workspace-bridge-mcp — An MCP server that bridges AI coding agents with multi-project workspaces, enabling cross-project file access, git history, and more.

License

MIT License