Window.onblur or Window.onfocus not working in Android Studio - android-studio

I implemented a simple Javascript function, which allows the audio to be paused or start depending on if the window where the script runs is focused on or not, and it works on the web.
However, I noticed an issue when I try to implement it in android studio, even after enabling the JS as seen in the screenshot. Indeed, when I get out of the app, the sound is still running whether I click on the back or the home button.
I'd like to add as well that I'm a total beginner in the android studio IDE, but I wanted to know if I could maybe find an answer here. How to make my Javascript-script work in the android environment ?
Thanks in advance
Audio Initialization
Javascript function for window.onblur and window.onfocus
Enabled Javascript in MainActivity.Java

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