It's a very simple app :
With this app you can create a software button in the center bottom of you screen and add several actions to this button.
Actions you can do with the button :
_Pull down notification
_A custom app
_Screenshot (Pro version)
/! If your device has a navigation bar (Home, Back and MultiTask buttons) on the screen, the touch area will be above the navigation bar ! /!
Read Phone State => Needed (and only used) to load applications list
Write Internal Storage => Save screenshots