This is an easy to use custom preference, which opens a dialog with a number picker. The value gets automatically saved and you can set the default-, min- and maxValue conveniently in the XML.
Nox is an Android library created to show a custom view with some NoxItem instances inside which are drawn following a shape indicated by the library user. You can create you own Shape implementations if you want, by default there are some interesting Shape implementations to show NoxItem instances following a circular, spiral or linear shape.