App Lock Master

App Lock Master, also known as Application Lock, is a famous Android app that allows you to lock and unlock applications with a password of your choice or a digital pattern.
With App Lock you can prevent unwanted people from accessing your mobile device's apps, from email to photo viewers, WhatsApp, Facebook or your web browser. App blocking not only allows you to protect other apps, but also offers various themes and backgrounds to customise the appearance of the phone.
Among its best security tools, it has an option to take automatic photos of those who try to unlock your device. In addition, you can hide the icon of this app to prevent an intruder from trying to erase it, leaving your protected applications unlocked.