HW_KEY_INPUT_V2
What it is
Property to feed H/W input events to android
int32array[0]: target display defined by VehicleDisplay like VehicleDisplay::MAIN, VehicleDisplay::INSTRUMENT_CLUSTER, VehicleDisplay::AUX int32array[1]: key code, must use standard android key code like KEYCODE_HOME, KEYCODE_BACK int32array[2]: action defined in VehicleHwKeyInputAction like VehicleHwKeyInputAction::ACTION_UP, VehicleHwKeyInputAction::ACTION_UP int32array[3]: repeat count of the event. For key down events, this is the repeat count with the first down starting at 0 and counting up from there. For key up events, this is always equal to 0
int64array[0]: down time, elapsed nanoseconds since boot. Denotes the time of the most recent key down event. For the down event, it will be the event time of the down event itself
How the ID is built
A property ID is a 32-bit value packing four fields. Reading 0x15e00a11 apart:
| Field | Mask | Value | Means |
|---|---|---|---|
| Group | 0xf0000000 | 0x10000000 | SYSTEM |
| Area | 0x0f000000 | 0x05000000 | SEAT |
| Type | 0x00ff0000 | 0x00e00000 | MIXED |
| Ordinal | 0x0000ffff | 0x00000a11 | 0xa11 |
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.