EVS_SERVICE_REQUEST
What it is
Enable/request an EVS service.
The property provides a generalized way to trigger EVS services. VHAL should use this property to request Android to start or stop EVS service.
int32Values[0] = a type of the EVS service. The value must be one of enums in EvsServiceType. int32Values[1] = the state of the EVS service. The value must be one of enums in EvsServiceState.
For example, to enable rear view EVS service, android side can set the property value as [EvsServiceType::REAR_VIEW, EvsServiceState::ON].
How the ID is built
A property ID is a 32-bit value packing four fields. Reading 0x11410f10 apart:
| Field | Mask | Value | Means |
|---|---|---|---|
| Group | 0xf0000000 | 0x10000000 | SYSTEM |
| Area | 0x0f000000 | 0x01000000 | GLOBAL |
| Type | 0x00ff0000 | 0x00410000 | INT32_VEC |
| Ordinal | 0x0000ffff | 0x00000f10 | 0xf10 |
Reading it from an app
This property is defined in the HAL but is not exposed as a constant in android.car.VehiclePropertyIds, so it is not reachable through CarPropertyManager from an ordinary app. It is used by the platform, or by vendor code running with system privileges.