A free program for Android, by IVYMOBILE.

The IVY AppLock Lite is an Android application that provides a way to lock your apps, photos, videos, and other private data with a password or pattern. It also provides a way to hide sensitive files from the Gallery. 

How to Set Up Your AppLock

The first thing you need to do is install the IVY AppLock Lite application on your device. The installation is a simple process, and the installation file is available in the Google Play Store. After the installation, you will be able to open the application and set up your IVY app lock. The first step is to open the application and select the type of lock you want to set up.