<Android Studio turning black colors to white when...

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Android Studio turning black colors to white when switched to dark mode
I am new to android studio and I am designing an app which must open a pdf file from the android storage device. I set the background color to black in the activity view and it works fine as long as I am not using my android in Dark mode. Once I turn on dark mode, the background color switches from black to white.
The activity view code:

https://i.stack.imgur.com/pl9l7.jpg▾

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https://i.stack.imgur.com/gtaiF.jpg▾

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