Performance & motion

PERF_VEHICLE_SPEED_DISPLAY

What it is

Speed of the vehicle for displays

Some cars display a slightly slower speed than the actual speed. This is usually displayed on the speedometer.

How the ID is built

A property ID is a 32-bit value packing four fields. Reading 0x11600208 apart:

Field	Mask	Value	Means
Group	0xf0000000	0x10000000	SYSTEM
Area	0x0f000000	0x01000000	GLOBAL
Type	0x00ff0000	0x00600000	FLOAT
Ordinal	0x0000ffff	0x00000208	0x208

Reading it from an app

CarPropertyManager mgr = (CarPropertyManager)
        car.getCarManager(Car.PROPERTY_SERVICE);

mgr.registerCallback(callback,
        VehiclePropertyIds.PERF_VEHICLE_SPEED_DISPLAY,
        CarPropertyManager.SENSOR_RATE_ONCHANGE);

This property is read-only — writes are rejected. It changes continuously, so subscribe at a sample rate rather than polling.