App Locker: Secure Folders, Vault Hide App Gallery can lock gallery, sms, contacts, files Setting and any app you choose. It secures files or data with password, pattern and fingerprint. Now it would be easy for you to lock apps in screen. Vault Hide App Gallery is one of the best android lock apps with privacy guard. The best app locker with password, pattern and fingerprint, this app lock is a safe folder app that provides high secure features in a single app.