Sensing the world

Delphi comes with the System.Sensors unit, where all kinds of possible sensors are defined. Similarly to the FMX.Platform unit, the System.Sensors also has ifdefs in its implementation and a uses clause for different platforms including Android and iOS.

There is main TSensorManager class that acts as a gateway to all sensor information. It has a Current: TSensorManager class property that is used to reference all sensor information. At the top of the System.Sensors unit, you can find a TSensorCategory enumerated type that provides the top level categorization of all possible sensors:

type
  TSensorCategory = (Location, Environmental, Motion, Orientation, Mechanical, Electrical, Biometric, Light, Scanner); 

Within each category there are different sensor types, so each category has its own enumerated type as well. All specialized sensor types derive from an abstract TCustomSensor class that provides basic functionality that is common to all sensors, for example, Start and Stop...