Smart App Lock is a handy application which you can use each time you want to protect specific apps and games from being accessed by other people. Its interface rocks a straightforward layout design and it should be a problem to learn how to use its functions. In order to protect an app you'll just have to add it inside the interface and to set up a password.
If you want to protect something like photos, this tool doesn't have a specific feature for that, but you can include the default gallery app of your Android device just to make it a bit harder for other users to see your pictures. In case someone tries to access your private app and it provides the wrong code, Smart App Lock will take a photo of the intruder using the built-in front-facing camera of your device.
A really positive aspect of this software is the ability to set customized passwords for each individual apps and video games. Furthermore, Smart App Lock also brings support for fingerprint lock method if your tablet or smartphone has this component integrated. In terms of translation, the interface of this application offers support for 31 languages.