LOW_SPEED_AUTOMATIC_EMERGENCY_BRAKING_STATE
What it is
Low Speed Automatic Emergency Braking state.
Returns the current state of Low Speed Automatic Emergency Braking. This property must always return a valid state defined in LowSpeedAutomaticEmergencyBrakingState or ErrorState. It must not surface errors through StatusCode and must use the supported error states instead. This property is different from the pre-existing AUTOMATIC_EMERGENCY_BRAKING_STATE, which should apply to higher speed applications only. If the vehicle doesn't have a separate collision avoidance system for low speed environments, this property should not be implemented.
If Low Speed Automatic Emergency Braking includes collision warnings before activating the brakes, those warnings must be surfaced through use of LOW_SPEED_COLLISION_WARNING_ENABLED and LOW_SPEED_COLLISION_WARNING_STATE.
For the global area ID (0), the VehicleAreaConfig#supportedEnumValues array must be defined unless all states of both LowSpeedAutomaticEmergencyBrakingState (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 0x11401026 apart:
| Field | Mask | Value | Means |
|---|---|---|---|
| Group | 0xf0000000 | 0x10000000 | SYSTEM |
| Area | 0x0f000000 | 0x01000000 | GLOBAL |
| Type | 0x00ff0000 | 0x00400000 | INT32 |
| Ordinal | 0x0000ffff | 0x00001026 | 0x1026 |
Reading it from an app
CarPropertyManager mgr = (CarPropertyManager)
car.getCarManager(Car.PROPERTY_SERVICE);
int value =
mgr.getIntProperty(VehiclePropertyIds.LOW_SPEED_AUTOMATIC_EMERGENCY_BRAKING_STATE, 0);This property is read-only — writes are rejected. It fires a callback whenever the value changes.