Restrict overlay in android

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How can I restrict any app to draw it's overlay on our app

canDrawOverlays or TYPE_SYSTEM_OVERLAY || TYPE_SYSTEM_OVERLAY

How can I disable any app that hacks

I have a trivia quiz app . Some developers make app that uses OCR to read question from my app and give results

Developer implement a Service that allows them to write overlay on our app like this

I want to restrict this service or stop it from taking picture using OCR through our app.



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