Blankj/AndroidUtilCode

Toggling FLAG_SECURE in WindowManager to prevent taking screenshots

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#1,564 opened on Nov 16, 2021

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Description

Describe the feature

Toggle FLAG_SECURE to prevent screenshot form activity/class/base/app.

The FLAG_SECURE "flag" in WindowManager prevents taking a screenshot from the app's screen in Android versions above 7, and scrambles the snapped shot final image in Android versions lower than 7.

https://developer.android.com/reference/android/view/WindowManager.LayoutParams#FLAG_SECURE

Reference

You can achieve it with only one line of code (Java): getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE); Kotlin: window.setFlags( WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE)

And to disable it (Java): getWindow().clearFlags(WindowManager.LayoutParams.FLAG_SECURE); Kotlin: window.clearFlags(WindowManager.LayoutParams.FLAG_SECURE)

Contributor guide

Research direction
Add a method to toggle FLAG SECURE in the WindowManager utility class. Implement setFlagSecure(boolean) that calls getWindow().setFlags or clearFlags accordingly. Provide both Java and Kotlin examples in comments.
Tech stack
javakotlin
Domain
mobile
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
1
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Android developmentJava
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
80