ADAS & driver assistance

LANE_CENTERING_ASSIST_STATE

What it is

Lane Centering Assist (LCA) state.

Returns the current state of LCA. This property must always return a valid state defined in LaneCenteringAssistState or ErrorState. It must not surface errors through StatusCode and must use the supported error states instead.

If LCA includes lane departure warnings, those warnings must be surfaced through the Lane Departure Warning (LDW) properties.

For the global area ID (0), the VehicleAreaConfig#supportedEnumValues array must be defined unless all states of both LaneCenteringAssistState (including OTHER, which is not recommended) and ErrorState are supported.

How the ID is built

A property ID is a 32-bit value packing four fields. Reading 0x1140100c apart:

Field	Mask	Value	Means
Group	0xf0000000	0x10000000	SYSTEM
Area	0x0f000000	0x01000000	GLOBAL
Type	0x00ff0000	0x00400000	INT32
Ordinal	0x0000ffff	0x0000100c	0x100c

Reading it from an app

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

int value =
        mgr.getIntProperty(VehiclePropertyIds.LANE_CENTERING_ASSIST_STATE, 0);

This property is read-only — writes are rejected. It fires a callback whenever the value changes.