App FingerLock APP
First ensure that a atleast one fingerprit is enrolled in the device (this will be used by the app for the authentication procedure). Then simply set-up the app by addint a back -up pin and choosing what apps to unlock. It uses PBKDF2/SHA1&AES Encryption and Persistent initialisation vector storage to securely perform passwrod aauthentication.
Your device doesnt have a fingerprint scanner? Absolutely no issues, the back-up password is used instead to authenticate locked apps.
Convinient and Secure.