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如何在 android Automotive VHAL 中创建自定义车辆属性？

如何生成 PropertyID 以及如何从 CarPropertyManager 访问它？

我在下面找到了参考，但对此我不清楚：

https://source.android.com/devices/automotive/properties#prop_custom][1]

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2 回答 2

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使用以下属性自定义车辆属性：

    EXAMPLE_PROPERTY = (
    0xXXXX
    | VehiclePropertyGroup:VENDOR
    | VehiclePropertyType:STRING
    | VehicleArea:GLOBAL),

可以通过 CarPropertyManager 访问自定义属性。我们只为所有供应商属性定义了一项权限：Car.PERMISSION_VENDOR_EXTENDSION (Android 10)

检查这个https://source.android.com/devices/automotive/vhal/properties#handling-custom-properties

在 Android 11 上，车辆 hal 支持通过 SUPPORT_CUSTOMIZE_VENDOR_PERMISSION 自定义供应商权限功能

    /**
 * Support customize permissions for vendor properties
 *
 * Implement this property if vehicle hal support customize vendor permissions feature.
 * VehiclePropConfig.configArray is used to indicate vendor properties and permissions
 * which selected for this vendor property. The permission must be one of enum in
 * VehicleVendorPermission.
 * The configArray is set as follows:
 *      configArray[n] = propId : property ID for the vendor property
 *      configArray[n+1] = one of enums in VehicleVendorPermission. It indicates the permission
 *      for reading value of the property.
 *      configArray[n+2] = one of enums in VehicleVendorPermission. It indicates the permission
 *      for writing value of the property.
 *
 * For example:
 * configArray = {
 *      vendor_prop_1, PERMISSION_VENDOR_SEAT_READ, PERMISSION_VENDOR_SEAT_WRITE,
 *      vendor_prop_2, PERMISSION_VENDOR_INFO, PERMISSION_NOT_ACCESSIBLE,
 * }
 * If vendor properties are not in this array, they will have the default vendor permission.
 * If vendor chose PERMISSION_NOT_ACCESSIBLE, android will not have access to the property. In
 * the example, Android can not write value for vendor_prop_2.
 *
 * @change_mode VehiclePropertyChangeMode:STATIC
 * @access VehiclePropertyAccess:READ
 */
SUPPORT_CUSTOMIZE_VENDOR_PERMISSION = (
    0x0F05
    | VehiclePropertyGroup:SYSTEM
    | VehiclePropertyType:BOOLEAN
    | VehicleArea:GLOBAL),
于 2020-11-02T11:46:01.417 回答
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检查这个 https://android.googlesource.com/platform/hardware/interfaces/+/refs/tags/android-9.0.0_r51/automotive/vehicle/2.0/types.hal

附注

  Vendors are allowed to extend this enum with their own properties 
  In this case they must use VehiclePropertyGroup:VENDOR flag when property is
  declared.

您必须扩展枚举 VehicleProperty，然后通过 CarPropertyManager 使其可用，并且可以通过 CarPropertyValue 获得价值

于 2020-02-28T03:36:04.593 回答