Prevent a Media Directory from Appearing in Android Gallery

The Gallery application on Android devices is a bit aggressive about scanning and adding directories. Have a directory you want to keep private? Use this simple trick to keep it out of the Gallery app.
If you want to use the Gallery app to show people pictures of your kid/dog/home remodeling project and not your girlfriend’s chest/drinking exploits/night at the club then this tip is for you. By default Android’s Gallery