HVAC_TEMPERATURE_DISPLAY_UNITS
What it is
Temperature units for display
Indicates whether the vehicle is displaying temperature to the user as Celsius or Fahrenheit. VehiclePropConfig.configArray is used to indicate the supported temperature display units. For example: configArray[0] = CELSIUS configArray[1] = FAHRENHEIT
This parameter MAY be used for displaying any HVAC temperature in the system. Values must be one of VehicleUnit.CELSIUS or VehicleUnit.FAHRENHEIT Note that internally, all temperatures are represented in floating point Celsius.
If updating HVAC_TEMPERATURE_DISPLAY_UNITS affects the values of other *_DISPLAY_UNITS properties, then their values must be updated and communicated to the AAOS framework as well.
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 0x1140050e apart:
| Field | Mask | Value | Means |
|---|---|---|---|
| Group | 0xf0000000 | 0x10000000 | SYSTEM |
| Area | 0x0f000000 | 0x01000000 | GLOBAL |
| Type | 0x00ff0000 | 0x00400000 | INT32 |
| Ordinal | 0x0000ffff | 0x0000050e | 0x50e |
Reading it from an app
CarPropertyManager mgr = (CarPropertyManager)
car.getCarManager(Car.PROPERTY_SERVICE);
int value =
mgr.getIntProperty(VehiclePropertyIds.HVAC_TEMPERATURE_DISPLAY_UNITS, 0);This property can be read and written, though an OEM may implement it as read-only. It fires a callback whenever the value changes.