How can I fix an APK?

I am developping an APK and I want to fix it at the screen, for example I do not want to let the users step out of the APK. Just like ATM machines...I am ready with the APK but when I swing my finger from the top of the right corner down the setup menu comes. I want to totally close and fix the screen. Mabe a master key could be ok...so for example if I touch one point of the csreen then I can unlock, but other way not.

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