Black Screen while Using Windowmanager.LayoutParams.FLAG_SECURE in google pixel 6 (android >= 11)

[godofblackfield]

1. I face a black screen whenever I use Windowmanager.LayoutParams.FLAG_SECURE to prevent screenshot and screen recordings on a device. This bug happens in specific devices like Google Pixel 6, Oppo, and Vivo.

• The following app activates Windowmanager.LayoutParams.FLAG_SECURE on clicking a button and then screen turns black. The code is below: -
• App.js: -
• /* eslint-disable react/react-in-jsx-scope */

2. import {Button, StyleSheet, View} from ‘react-native’;
3. import * as ScreenCapture from ‘expo-screen-capture’;

• export default function ScreenCaptureExample() {

4. const activate = async () => {
5. await ScreenCapture.preventScreenCaptureAsync();
6. };

• const deactivate = async () => {

7. await ScreenCapture.allowScreenCaptureAsync();
8. };

• return (

15. );
16. }

• const styles = StyleSheet.create({

17. container: {
18. flex: 1,
19. alignItems: ‘center’,
20. justifyContent: ‘center’,
21. },
22. });
23. ScreenCaptureAndroid.js: -

• import * as ScreenCapture from ‘expo-screen-capture’;
• const allowScreenCapture = async () => {

24. try {
25. await ScreenCapture.allowScreenCaptureAsync();
26. } catch (e) {}
27. };
28. const disableScreenCapture = async () => {
29. try {
30. await ScreenCapture.preventScreenCaptureAsync();
31. } catch (e) {}
32. };

• const func = {

33. allowScreenCapture,
34. disableScreenCapture,
35. };
36. export default func;
37. ScreenCaptureModule.kt (File from expo-screen-capture node_modules folder): -

• package expo.modules.screencapture
• import android.view.Display
• import android.content.Context

38. import android.view.WindowManager
39. import expo.modules.kotlin.exception.Exceptions
40. import expo.modules.kotlin.functions.Queues
41. import expo.modules.kotlin.modules.Module
42. import expo.modules.kotlin.modules.ModuleDefinition

• class ScreenCaptureModule : Module() {

43. private val context: Context
44. get() = appContext.reactContext ?: throw Exceptions.AppContextLost()
45. private val currentActivity
46. get() = appContext.currentActivity ?: throw Exceptions.MissingActivity()

• override fun definition() = ModuleDefinition {

47. Name(“ExpoScreenCapture”)

• OnCreate {

48. ScreenshotEventEmitter(context, appContext.legacyModuleRegistry)
49. }

• AsyncFunction(“preventScreenCapture”) {

50. currentActivity.window.addFlags(WindowManager.LayoutParams.FLAG_SECURE)
51. }.runOnQueue(Queues.MAIN)

• AsyncFunction(“allowScreenCapture”) {

52. currentActivity.window.clearFlags(WindowManager.LayoutParams.FLAG_SECURE)
53. }.runOnQueue(Queues.MAIN)
54. }
55. }