Flutter Screen Data Leakage Protector

A Flutter plugin designed to prevent sensitive data leakage by obscuring the screen when the application is in the background or the App Switcher.

This plugin provides a robust security layer by automatically covering your application's UI with a black overlay during transition states, protecting user privacy and corporate data from being visible in system-level previews.

Features

  • Automatic Protection: Seamlessly detects when the app is moving to the background or the app switcher.
  • Security Overlay: Displays a solid black overlay by default or a custom image of your choice.
  • Customizable: Add custom privacy overlay image for screen data leakage protector through simple API calls.
  • Auto-Recovery: Automatically removes the overlay when the user returns to the app.
  • Cross-Platform: Fully supports both Android and iOS with native implementations.
  • High Performance: Uses native APIs for minimal overhead and immediate protection.

Platform Support

Android iOS
✅ ✅

Installation

Add this to your pubspec.yaml:

dependencies:
  flutter_screen_data_leakage_protector: ^1.1.0

Basic Usage

Simply including the plugin in your project activates its default protection behavior (black overlay).

import 'package:flutter_screen_data_leakage_protector/flutter_screen_data_leakage_protector.dart';

Advanced Usage (Custom Overlay Image)

You can configure a custom image to be displayed instead of the default black screen.

@override
void initState() {
  super.initState();
  // Name of the image in your native assets (xcassets for iOS, drawable for Android)
  FlutterScreenDataLeakageProtector.applyDataLeakageWithConfig(
    overlayImage: 'PrivacyOverlay',
  );
}

How it works

  • iOS: Uses UIApplication.willResignActiveNotification and UIApplication.didBecomeActiveNotification to toggle a UIView overlay on the key window.
  • Android: Utilizes ActivityLifecycleCallbacks and a BroadcastReceiver for ACTION_CLOSE_SYSTEM_DIALOGS to detect Home and Recent apps interactions, applying a black View overlay to the decor view.

Verification Steps

  1. Run the application.
  2. Minimize the app or open the App Switcher (Multi-tasking view).
  3. Observe that the screen preview is obscured (blacked out).
  4. Return to the app and confirm the UI is restored immediately.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Libraries

flutter_screen_data_leakage_protector
flutter_screen_data_leakage_protector_method_channel
flutter_screen_data_leakage_protector_platform_interface