AUTOMATIC_EMERGENCY_BRAKING_STATE
What it is
Automatic Emergency Braking (AEB) state.
Returns the current state of AEB. This property must always return a valid state defined in AutomaticEmergencyBrakingState or ErrorState. It must not surface errors through StatusCode and must use the supported error states instead. This property should apply for higher speed applications only. For representing the state of the low speed automatic emergency braking system, LOW_SPEED_AUTOMATIC_EMERGENCY_BRAKING_STATE should be used.
If AEB includes forward collision warnings before activating the brakes, those warnings must be surfaced through the Forward Collision Warning (FCW) properties.
For the global area ID (0), the VehicleAreaConfig#supportedEnumValues array must be defined unless all states of both AutomaticEmergencyBrakingState (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 0x11401001 apart:
| Field | Mask | Value | Means |
|---|---|---|---|
| Group | 0xf0000000 | 0x10000000 | SYSTEM |
| Area | 0x0f000000 | 0x01000000 | GLOBAL |
| Type | 0x00ff0000 | 0x00400000 | INT32 |
| Ordinal | 0x0000ffff | 0x00001001 | 0x1001 |
Reading it from an app
CarPropertyManager mgr = (CarPropertyManager)
car.getCarManager(Car.PROPERTY_SERVICE);
int value =
mgr.getIntProperty(VehiclePropertyIds.AUTOMATIC_EMERGENCY_BRAKING_STATE, 0);This property is read-only — writes are rejected. It fires a callback whenever the value changes.