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AppLock works fine too, and it's open source, have a look: AppLock (Trava de aplicativo por privacidade) - https://f-droid.org/app/io.github.subhamtyagi.privacyapplock
it slow. i need a locker like that when an app click to run first run locker then app. because if app run first then run lock then any one can dump data from recent app.