Is there a way to “hide” an installed Android application from displaying in App> Installed / Downloaded / On SD Card
Only by creating your own ROM.
Or is there a way to restrict other applications from accessing your application?
It depends on the nature of the "access".
I'm trying to reduce APKInstaller to my access to "see" my application so that it does not allow the "export" function in the "manage" APKInstaller option, which allows me to export my application to .apk
No, sorry, most of the APK files are readable in the world.
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