How can I secure my Android app against unauthorized modifications or APK patching using PackageManager signatures?

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I would like to ask a question regarding Unauthorized Application Modification or APK Patching in the context of Android. How can I secure my application against this threat? Is using PackageManager an effective tool for implementing protection against unauthorized modifications, and if so, how can it be done? I could get a signatures of an instlalled package and then what? Thanks for any advice

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