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Vehicle properties
Displays & HMInot in the public Car API

HW_MOTION_INPUT

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]: input type defined in VehicleHwMotionInputSource like VehicleHwMotionInputSource::SOURCE_KEYBOARD, VehicleHwMotionInputSource::SOURCE_DPAD int32array[2]: action code defined in VehicleHwMotionInputAction like VehicleHwMotionInputAction::ACTION_UP, VehicleHwMotionInputAction::ACTION_DOWN int32array[3]: button state flag defined in VehicleHwMotionButtonStateFlag like VehicleHwMotionButtonStateFlag::BUTTON_PRIMARY, VehicleHwMotionButtonStateFlag::BUTTON_SECONDARY int32array[4]: pointer events count, N. N must be a positive integer int32array[5:5+N-1]: pointer id, length N int32array[5+N:5+2*N-1] : tool type, length N. As defined in VehicleHwMotionToolType like VehicleHwMotionToolType::TOOL_TYPE_FINGER, VehicleHwMotionToolType::TOOL_TYPE_STYLUS

floatArray[0:N-1] : x data, length N floatArray[N:2*N-1] : y data, length N floatArray[2*N:3*N-1] : pressure data, length N floatArray[3*N:4*N-1] : size data, length N

int64array[0]: down time, elapsed nanoseconds since boot. Denotes the time when the user originally pressed down to start a stream of position events. 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 0x15e00a12 apart:

FieldMaskValueMeans
Group0xf00000000x10000000SYSTEM
Area0x0f0000000x05000000SEAT
Type0x00ff00000x00e00000MIXED
Ordinal0x0000ffff0x00000a120xa12

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.