Usar o APKPure APP
Obter o APK da versão antiga de App Protector - App Locker para Android
você pode proteger qualquer aplicativo em seu telefone com este aplicativo
You can protect any application in your phone such as (Gallery, E-Mail,Contact ,Game...) with this app .it just take two click to enable service and choose app lock which you want to lock . If your friend , your kids or anybody want borrow your phone you just block app which you want to prevent the other person use it and you can comfortable because your phone was protected safely