Starting March 27, 2025, we recommend using android-latest-release instead of aosp-main to build and contribute to AOSP. For more information, see Changes to AOSP.
Supported system properties
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Properties supported by the VHAL
must be either a system property or a vendor property. In Android 14 and
higher, system property definitions are defined at
VehicleProperty.aidl.
In Android 13 and lower, system property definitions are defined at automotive/vehicle/aidl/android/hardware/automotive/vehicle/VehicleProperty.aidl, for example, for Android 13, see
VehicleProperty.aidl.
In Android 14 and higher, the system property definition is defined in the AIDL interface,
android.hardware.automotive.vehicle.property, which is separate from the VHAL
interface (android.hardware.automotive.vehicle). VHAL implementations and VHAL
clients must depend on both interfaces.
For VHAL properties exposed through CarPropertyManager, see
VehiclePropertyIds.
Auto-generated access modes and change modes
In Android 14 and higher, to support VHAL implementations, we provide auto-generated
C++ header
files and
Java class files
with the allowed change mode or access mode for system properties. Vendor VHAL implementations
can use these to ensure the property configs meet the specification.
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Last updated 2025-08-29 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-29 UTC."],[],[],null,["# Supported system properties\n\nProperties supported by the VHAL\nmust be either a system property or a vendor property. In Android 14 and\nhigher, system property definitions are defined at\n[VehicleProperty.aidl](https://android.googlesource.com/platform/hardware/interfaces/+/refs/heads/android16-release/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl).\n\n\nIn Android 13 and lower, system property definitions are defined at `automotive/vehicle/aidl/android/hardware/automotive/vehicle/VehicleProperty.aidl`, for example, for Android 13, see\n[VehicleProperty.aidl](https://android.googlesource.com/platform/hardware/interfaces/+/refs/heads/android13-release/automotive/vehicle/aidl/android/hardware/automotive/vehicle/VehicleProperty.aidl).\n\nIn Android 14 and higher, the system property definition is defined in the AIDL interface,\n`android.hardware.automotive.vehicle.property`, which is separate from the VHAL\ninterface (`android.hardware.automotive.vehicle`). VHAL implementations and VHAL\nclients must depend on both interfaces.\n\nFor VHAL properties exposed through `CarPropertyManager`, see\n[VehiclePropertyIds](https://developer.android.com/reference/android/car/VehiclePropertyIds).\n\nAuto-generated access modes and change modes\n--------------------------------------------\n\nIn Android 14 and higher, to support VHAL implementations, we provide auto-generated\n[C++ header\nfiles](https://android.googlesource.com/platform/hardware/interfaces/+/refs/heads/android16-release/automotive/vehicle/aidl/generated_lib/4/cpp) and\n[Java class files](https://android.googlesource.com/platform/hardware/interfaces/+/refs/heads/android16-release/automotive/vehicle/aidl/generated_lib/4/java)\nwith the allowed change mode or access mode for system properties. Vendor VHAL implementations\ncan use these to ensure the property configs meet the specification."]]
