HVAC_AUTO_ON
What it is
On/off automatic climate control.
If true, automatic climate control is on. If false, automatic climate control is off.
If the vehicle does not support directly turning off automatic climate control, then OEMs should add logic in their VHAL implementation so that setting HVAC_AUTO_ON to false would change the necessary HVAC settings to indirectly turn off HVAC_AUTO_ON. Ideally, this should not be disruptive to the user, so OEMs should change back to the previous state any settings that were modified once automatic climate control is off. That way the only outcome should be that HVAC_AUTO_ON is off. If restoring the HVAC settings to its previous settings is not possible, then the OEM should choose the least disruptive change and implement that.
This property is defined as VehiclePropertyAccess.READ_WRITE, but OEMs have the option to implement it as VehiclePropertyAccess.READ only.
How the ID is built
A property ID is a 32-bit value packing four fields. Reading 0x1520050a apart:
| Field | Mask | Value | Means |
|---|---|---|---|
| Group | 0xf0000000 | 0x10000000 | SYSTEM |
| Area | 0x0f000000 | 0x05000000 | SEAT |
| Type | 0x00ff0000 | 0x00200000 | BOOLEAN |
| Ordinal | 0x0000ffff | 0x0000050a | 0x50a |
Reading it from an app
CarPropertyManager mgr = (CarPropertyManager)
car.getCarManager(Car.PROPERTY_SERVICE);
boolean value =
mgr.getBooleanProperty(VehiclePropertyIds.HVAC_AUTO_ON, areaId);This property can be read and written, though an OEM may implement it as read-only. It fires a callback whenever the value changes.