'How to create a React Native floating app that checks the user screen?

Im not asking for code, Im just asking for a way to follow.

I play this game called Clash Royale where the player plays a card and that card "summons" a character.

I want to create a react native app that is floating like a sidebar and that tracks the cards that have been played.

I know that I need to create a logic to check for specific pixels but i wasnt able to find how to make the app to be floating and to check the user screen at the same time.

Can someone give me a tip, please?



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