vpn_notice 0.2.0

Detect active VPN connections and show a customizable notice — banner, snackbar, dialog, or bottom sheet — with zero third-party Dart dependencies.

vpn_notice

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Flutter package for detecting an active VPN connection and showing a notice on Android and iOS.

• 📱 Material on Android, Cupertino on iOS.
• ⚡ No state-management dependency.
• 🎨 Banner, snack bar, dialog, bottom sheet, or your own overlay.

Screenshots

The example app running on Android and iOS.

Quick start

flutter pub add vpn_notice

On Android, add this permission to android/app/src/main/AndroidManifest.xml:

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

iOS needs no extra configuration.

Put VpnNoticeGate around the screen where you want the notice to appear:

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

MaterialApp(
  home: VpnNoticeGate(
    displayType: VpnNoticeDisplayType.banner,
    style: const VpnNoticeStyle(
      title: 'VPN detected',
      message: 'Some content may load differently while connected.',
    ),
    child: const MyHomePage(),
  ),
);

Important

Place VpnNoticeGate below MaterialApp, not around it or in its builder. The built-in presentations need a Navigator, ScaffoldMessenger, or Overlay above their context.

Choose a presentation

Type	Best for	Android	iOS
banner	Persistent, low-priority notice	Material banner	Blurred top card
snackBar	Brief feedback	Floating snack bar	Blurred bottom card
dialog	Acknowledgement required	Material dialog	Cupertino alert
bottomSheet	Extra context or an action	Material sheet	Cupertino sheet

By default, the gate shows once. Set showOncePerSession: false to show it again after each new VPN connection.

Customise the built-in UI

Use VpnNoticeStyle to set the text, icon, colours, text styles, border radius, and padding. Anything you leave unset comes from the current platform theme.

const style = VpnNoticeStyle(
  title: 'VPN detected',
  message: 'Some content may load differently while connected.',
  actionLabel: 'Got it',
  backgroundColor: Colors.black,
  foregroundColor: Colors.white,
  icon: Icons.vpn_lock_outlined,
);

Pass the same style to any built-in presentation:

VpnNoticeBanner.show(context, style: style);
VpnNoticeSnackBar.show(context, style: style);
VpnNoticeDialog.show(context, style: style);
VpnNoticeBottomSheet.show(context, style: style);

Call VpnNoticeBanner.hide(context) to dismiss a banner. Snack bars close after four seconds by default.

Build your own overlay

Use builder when the built-in layouts are not enough. It receives an overlay context and a dismiss callback, so you decide how and where the notice is shown on both platforms.

VpnNoticeGate(
  builder: (context, dismiss) => Positioned(
    top: MediaQuery.paddingOf(context).top + 12,
    left: 16,
    right: 16,
    child: Material(
      color: Colors.black,
      borderRadius: BorderRadius.circular(12),
      child: ListTile(
        leading: const Icon(Icons.vpn_lock_outlined, color: Colors.white),
        title: const Text(
          'VPN detected',
          style: TextStyle(color: Colors.white),
        ),
        trailing: IconButton(
          onPressed: dismiss,
          icon: const Icon(Icons.close, color: Colors.white),
        ),
      ),
    ),
  ),
  child: const MyHomePage(),
);

The runnable example has buttons for every built-in presentation and this custom overlay.

Use without a gate

For manual control, create a VpnNoticeController:

final controller = VpnNoticeController();
await controller.start();

if (controller.isVpnActive) {
  VpnNoticeSnackBar.show(context);
}

await controller.stop(); // Or call dispose() if you own the controller.

Use await VpnNoticeController().checkOnce() for a one-off check, or listen to the controller with ValueListenableBuilder.

Compatibility

Platform	Minimum	Detection
Android	API 24	NetworkCapabilities.TRANSPORT_VPN with interface fallback
iOS	13.0	System proxy settings with interface fallback

Flutter >=3.44.1 and Dart ^3.12.1 are required. Other platforms do not have a native implementation, so guard platform calls accordingly.

License

MIT