AOSP：如何在vehicl hal中初始化VehicleProperty :: AUDIO_VOLUME属性（DefaultConfig.h中的.initialValues）？

Question

尝试将AUDIO_VOLUME属性添加到/hardware/interfaces/automotive/vehicle/2.0/default/impl/vhal_v2_0/中的演示车辆代码中

文件名：DefaultConfig.h尝试添加如下，但它崩溃了。

    {.config =
        {
            .prop = toInt(VehicleProperty::AUDIO_VOLUME),
            .access = VehiclePropertyAccess::READ_WRITE,
            .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
            .configArray = { toInt(VehicleAudioContextFlag::MUSIC_FLAG), toInt(VehicleAudioVolumeCapabilityFlag::MASTER_VOLUME_ONLY),0,0,100 },
        },
        .initialValue = {.int32Values = { toInt(VehicleAudioContextFlag::MUSIC_FLAG), 80, toInt(VehicleAudioVolumeState::STATE_OK)  } }
    },

在/hardware/interfaces/automotive/vehicle/2.0/types.hal中定义的AUDIO_VOLUME属性* @change_mode VehiclePropertyChangeMode：ON_CHANGE * @access VehiclePropertyAccess：READ_WRITE * @config_flags支持所有音频上下文。 * / AUDIO_VOLUME =（0x0901 | VehiclePropertyGroup：SYSTEM | VehiclePropertyType：INT32_VEC | VehicleArea：GLOBAL），

参考OSP代码可在http://androidxref.com/8.0.0_r4/xref/获得

Answer 1

使用hidl_vec打包初始值。

例：

{.config =
        {
            .prop = toInt(VehicleProperty::AUDIO_VOLUME),
            .access = VehiclePropertyAccess::READ_WRITE,
            .changeMode = VehiclePropertyChangeMode::ON_CHANGE,
            .configArray = { toInt(VehicleAudioContextFlag::MUSIC_FLAG), toInt(VehicleAudioVolumeCapabilityFlag::MASTER_VOLUME_ONLY),0,0,100 },
        },
        .initialValue = {.int32Values = hidl_vec<int32_t> {toInt(VehicleAudioContextFlag::MUSIC_FLAG), 80, toInt(VehicleAudioVolumeState::STATE_OK) }}
    },

由于此属性需要INT32_VEC值。