Sensing the world

Unlike desktop computers, mobile devices have a rich set of sensors. They obviously have cameras, but they also generally have Global Positioning System (GPS), a compass, a gyroscope, possibly light detectors, a torch light, at times humidity and pressure sensors, and even more.

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

In the library, there is the main TSensorManager class that acts as a gateway to all sensor information. The class has a class property called Current: TSensorManager, which is used to expose a global object including all sensor information.

At the top of the System.Sensors unit you can find a TSensorCategory enumerated type, which provides the top-level categorization of all possible types of sensors:

type
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