AnalogClock is, well, an analog clock. It is always displayed as a circle within the bounds of the view. It is based on a so View all the View properties and methods are available to tailor its appearance. This is an 'Activity Object', it cannot be declared under Sub Process_Globals.
Chronometer is a view that counts up from zero when started. It is based on a TextView so all the TextView properties and methods are available to tailor its appearance. This is an 'Activity Object', it cannot be declared under Sub Process_Globals.
DigitalClock is, well, a digital clock. It is based on a TextView so all the TextView properties and methods are available to tailor its appearance. This is an 'Activity Object', it cannot be declared under Sub Process_Globals.