screen_security

A zero-dependency Flutter plugin to prevent screen capturing and screen recording on iOS and Android.

Platform	Mechanism
Android	`WindowManager.LayoutParams.FLAG_SECURE` via `ActivityAware`
iOS	Injects `FlutterView` into a secure `UITextField` layer (`isSecureTextEntry`), avoiding the common camera-black-screen conflict

Features

Prevent screenshots and screen recording on both platforms
No external dependencies — pure native implementation
iOS: Does not manipulate the window directly, so camera, keyboard, and SafeArea work correctly
Android: Uses the standard FLAG_SECURE flag
Simple enable() / disable() API

Getting Started

Add the dependency:

dependencies:
  screen_security: ^1.0.0

Usage

import 'package:screen_security/screen_security.dart';

final screenSecurity = ScreenSecurity();

// Enable screen protection
await screenSecurity.enable();

// Disable screen protection
await screenSecurity.disable();

Platform Requirements

Platform	Minimum Version
Android	API 24 (minSdk)
iOS	13.0
Flutter	≥ 3.3.0

How It Works

Android

Applies FLAG_SECURE to the current Activity window, which prevents the system from including app content in screenshots or screen recordings.

iOS

Creates a custom UITextField subclass with isSecureTextEntry = true and injects the FlutterView into its internal secure layer. This leverages iOS's built-in DRM rendering pipeline to blank out the content during screen capture — without touching the window hierarchy directly, preserving camera, keyboard, and SafeArea behavior.

Known Issues

Android build fails with Thai locale (Buddhist Calendar)

If your system locale is set to Thai (th_TH), the Android Gradle Plugin (AGP) may fail with:

com.google.common.base.VerifyException (no error message)
  at ...MsDosDateTimeUtils.packDate(...)

This is a known AGP bug where BuddhistCalendar returns year 2569 (instead of 2026), which exceeds the MS-DOS date format limit (1980–2107).

Fix: Add the following JVM flags to your project's android/gradle.properties:

org.gradle.jvmargs=... -Duser.language=en -Duser.country=US

Append -Duser.language=en -Duser.country=US to your existing org.gradle.jvmargs line.

License

MIT — see LICENSE for details.