A free program for Android, by xu fangqin.

In order to ensure the security of your data, we need to restrict access to our apps and games.  There are many ways to do this, but the most common one is to use a password. However, this can be problematic, as it is easy for someone to steal your password.

Fortunately, there is another option:  you can use a pattern.  This is a little more complicated than a password, but it is more secure.

Super AppLock Theme Vampire FullMoon is a new, unique, and interesting pattern that you can use to secure your apps.

You can download it for free from Google Play.