[[["わかりやすい","easyToUnderstand","thumb-up"],["問題の解決に役立った","solvedMyProblem","thumb-up"],["その他","otherUp","thumb-up"]],[["必要な情報がない","missingTheInformationINeed","thumb-down"],["複雑すぎる / 手順が多すぎる","tooComplicatedTooManySteps","thumb-down"],["最新ではない","outOfDate","thumb-down"],["翻訳に関する問題","translationIssue","thumb-down"],["サンプル / コードに問題がある","samplesCodeIssue","thumb-down"],["その他","otherDown","thumb-down"]],["最終更新日 2025-03-26 UTC。"],[],[],null,["# Overview\n\nThe vehicle hardware abstraction layer (VHAL) interface defines the properties OEMs can\nimplement and contains property metadata. For example, whether a property is an integer and\nwhich change modes are allowed. The VHAL interface is based on accessing (reading, writing, and\nsubscribing) a property, which is an abstraction for a specific function.\n\n- In Android 13 and higher, VHAL migrated to AIDL at `IVehicle.aidl`\n- In Android 12 and lower, VHAL is defined with HIDL language in `IVehicle.hal`\n\n| **Note:** All new features, including new property definitions, will be added to the AIDL interface **only.**\n\nCarService and Android native components support HIDL and AIDL backend and prefer the AIDL\nbackend when it's available.\n\n| Guidance | Description |\n|--------------------|----------------------------------------------------------------------------------|\n| STRONGLY RECOMMEND | For **existing** HIDL VHAL implementations, migrate to the newer AIDL interface. |\n| MUST | For **new** VHAL implementations, use the AIDL interface. |\n\n\nTo learn more about the VHAL, see these pages:\n\n- [VHAL interface](/docs/automotive/vhal/vhal-interface)\n[](/docs/automotive/vhal/vhal-interface)\n- [](/docs/automotive/vhal/vhal-interface)[Property configurations](/docs/automotive/vhal/property-configuration)\n[](/docs/automotive/vhal/property-configuration)\n- [](/docs/automotive/vhal/property-configuration)[Supported system properties](/docs/automotive/vhal/system-properties)\n[](/docs/automotive/vhal/system-properties)\n- [](/docs/automotive/vhal/system-properties)[Special properties](/docs/automotive/vhal/special-properties)\n[](/docs/automotive/vhal/special-properties)\n- [](/docs/automotive/vhal/special-properties)[SEAT and STEERING_WHEEL properties](/docs/automotive/vhal/seat-steering)\n[](/docs/automotive/vhal/seat-steering)\n- [](/docs/automotive/vhal/seat-steering)[ADAS properties](/docs/automotive/vhal/adas-properties)\n[](/docs/automotive/vhal/adas-properties)\n- [](/docs/automotive/vhal/adas-properties)[Reference implementation](/docs/automotive/vhal/reference-implementation)\n[](/docs/automotive/vhal/reference-implementation)\n- [](/docs/automotive/vhal/reference-implementation)[Debug the VHAL](/docs/automotive/vhal/vhal_debug)\n[](/docs/automotive/vhal/vhal_debug)\n- [](/docs/automotive/vhal/vhal_debug)[Use VHAL with the native client](/docs/automotive/vhal/native-client)\n[](/docs/automotive/vhal/native-client)\n- [](/docs/automotive/vhal/native-client)[HIDL VHAL migration guide](/docs/automotive/vhal/hidl-vhal-migration)\n- [HIDL VHAL interface](/docs/automotive/vhal/hidl-vhal-interface)"]]