With the  diffusion of mobile devices is important to continue to offer to users the most possible number of functions, but there’re some problems due to little screens.
For example, with a 5’’ screen a UI Designer can’t draw all the buttons that could do for a desktop app. Button group like this below, are not possible on a smartphone:

From this problem I thinked to a possible solution, it’s easy to use and easy to code: a miniJoystick component, a simple button that uses the properties of the touch screens.
MiniJoystick is a button that can be clicked or can be dragged to left/rigth, up/down, like the old joystick!
For example, the same button can be used to go to next image (“>”) o go to the last image (“>>”), just click on it or drag-to-right.

This is a demo code of Mini-Joystick idea