Vehicle properties
Tyres, brakes & chassis
TRAILER_PRESENT
What it is
Indicates if there is a trailer present or not.
Returns the trailer state of the car.
How the ID is built
A property ID is a 32-bit value packing four fields. Reading 0x11400f45 apart:
| Field | Mask | Value | Means |
|---|---|---|---|
| Group | 0xf0000000 | 0x10000000 | SYSTEM |
| Area | 0x0f000000 | 0x01000000 | GLOBAL |
| Type | 0x00ff0000 | 0x00400000 | INT32 |
| Ordinal | 0x0000ffff | 0x00000f45 | 0xf45 |
Reading it from an app
CarPropertyManager mgr = (CarPropertyManager)
car.getCarManager(Car.PROPERTY_SERVICE);
int value =
mgr.getIntProperty(VehiclePropertyIds.TRAILER_PRESENT, 0);This property is read-only — writes are rejected. It fires a callback whenever the value changes.