The callback did not follow the correct naming conventions.
The view model's name is bound to the user interface.
Changed the style for optimization as suggested by the graphical layout
editor.
Just the infrastructure for the controller UI element, which is a
compound control. There is only one button, and it is not styled
correctly, but it is a starting point.
Started styling a circular widget. This will be added to a state list
drawable to be used as a button and perhaps even for the dial to select
a duration when setting duration of an interval.