ADAS & driver assistance

FORWARD_COLLISION_WARNING_STATE

What it is

Forward Collision Warning (FCW) state.

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

For the global area ID (0), the VehicleAreaConfig#supportedEnumValues array must be defined unless all states of both ForwardCollisionWarningState (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 0x11401003 apart:

Field	Mask	Value	Means
Group	0xf0000000	0x10000000	SYSTEM
Area	0x0f000000	0x01000000	GLOBAL
Type	0x00ff0000	0x00400000	INT32
Ordinal	0x0000ffff	0x00001003	0x1003

Reading it from an app

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

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

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