Safe Gallery Free (Media Lock) is an app that helps you protect your galleries with either a numerical or pattern-based password.
With Safe Gallery Free, you can choose exactly which pictures and videos you want to have password-protected, and which ones can remain unprotected. That way, you can have all your images in normal galleries but keep a small, password-protected gallery with private content.
Safe Gallery Free is ideal if you're worried about people trying to see the images and videos on your smartphone. It's also useful if you keep almost all your photos on an Android tablet or another similar device.