POWER_POLICY_GROUP_REQ
What it is
Defines a request to set the power polic group used to decide a default power policy per power status transition.
VHAL sets this property with the ID of a power policy group in order to set the default power policy applied at power status transition. Power policy groups are defined at /vendor/etc/power_policy.xml. If the given ID is not defined, car power policy service ignores the request. Car power policy service subscribes to this property and sets the power policy group. The actual application of power policy takes place when the system power status changes and there is a valid mapped power policy for the new power status.
string: "sample_policy_group_id" // power policy group ID
How the ID is built
A property ID is a 32-bit value packing four fields. Reading 0x11100f22 apart:
| Field | Mask | Value | Means |
|---|---|---|---|
| Group | 0xf0000000 | 0x10000000 | SYSTEM |
| Area | 0x0f000000 | 0x01000000 | GLOBAL |
| Type | 0x00ff0000 | 0x00100000 | STRING |
| Ordinal | 0x0000ffff | 0x00000f22 | 0xf22 |
Reading it from an app
CarPropertyManager mgr = (CarPropertyManager)
car.getCarManager(Car.PROPERTY_SERVICE);
CarPropertyValue<String> value =
mgr.getProperty(VehiclePropertyIds.POWER_POLICY_GROUP_REQ, 0);This property is read-only — writes are rejected. It fires a callback whenever the value changes.