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Effective in 2026, to align with our trunk stable development model and ensure platform stability for the ecosystem, we will publish source code to AOSP in Q2 and Q4. For building and contributing to AOSP, use android-latest-release. The android-latest-release manifest branch will always reference the most recent release pushed to AOSP. For more information, see Changes to AOSP.
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ADAS vehicle properties
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We've added the following new ADAS properties to Android 14:
Automatic emergency braking (AEB)
Hands on detection (HOD)
Lane centering assist (LCA)
Forward collision warning (FCW)
Blind spot warning (BSW)
Lane departure warning (LDW)
Lane keep assist (LKA)
Emergency lane keep assist (ELKA)
Standard cruise control (CC)
Adaptive cruise control (ACC)
These new capabilities are illustrated in the following figure.
Figure 1. Supported ADAS features.
List of properties
To support these new features, a list of properties is added to
Android 14. They're listed below.
Properties
ADAPTIVE_CRUISE_CONTROL_TARGET_TIME_GAP
ADAPTIVE_CRUISE_CONTROL_LEAD_VEHICLE_DISTANCE
AUTOMATIC_EMERGENCY_BRAKING_ENABLED
AUTOMATIC_EMERGENCY_BRAKING_STATE
BLIND_SPOT_WARNING_ENABLED
BLIND_SPOT_WARNING_STATE
CRUISE_CONTROL_ENABLED
CRUISE_CONTROL_TYPE
CRUISE_CONTROL_STATE
CRUISE_CONTROL_COMMAND
CRUISE_CONTROL_TARGET_SPEED
EMERGENCY_LANE_KEEP_ASSIST_ENABLED
EMERGENCY_LANE_KEEP_ASSIST_STATE
FORWARD_COLLISION_WARNING_ENABLED
FORWARD_COLLISION_WARNING_STATE
HANDS_ON_DETECTION_ENABLED
HANDS_ON_DETECTION_DRIVER_STATE
HANDS_ON_DETECTION_WARNING
LANE_DEPARTURE_WARNING_ENABLED
LANE_DEPARTURE_WARNING_STATE
LANE_KEEP_ASSIST_ENABLED
LANE_KEEP_ASSIST_STATE
LANE_CENTERING_ASSIST_ENABLED
LANE_CENTERING_ASSIST_COMMAND
LANE_CENTERING_ASSIST_STATE
Design themes
The following design themes are applied to newly added properties.
Property
Description
ENABLED
Properties to indicate if a feature is enabled or disabled.
Boolean properties in which true is enabled and false is
disabled.
Read and Write properties that can be implemented as
Read-only.
STATE
Properties to communicate feature state through a list of predefined states.
Int32 properties with defined enums.
OTHER field to support backward compatibility.
Read-only properties.
Mirror or Global area types.
Uses values defined in
ErrorStates.aidl.
Use the
getSupportedEnumValues()
API in
AreaIdConfig.java.
Miscellaneous
COMMAND properties for features when user input is required.
WARNING properties for when state can be represented separately.
Other properties to support:
Feature variations when applicable.
Adjust feature settings when applicable.
State diagram examples
This section provides state diagrams for a subset of the supported ADAS features to demonstrate
how the included properties work together. We've provided examples of the following features.
Automatic emergency braking (AEB)
Lane centering assist (LCA)
Hands-on detection (HOD)
Automatic emergency braking
Two properties are defined for AEB as described in this table.
Property
Values
AUTOMATIC_EMERGENCY_BRAKING_ENABLED
VehiclePropertyType:BOOLEAN
AUTOMATIC_EMERGENCY_BRAKING_STATE
Defined in
AutomaticEmergencyBrakingState.aidl.
VehiclePropertyType:INT32
OTHER
ENABLED
ACTIVATED
USER_OVERRIDE
ErrorState
The following sample state diagram for AEB includes the supported states defined in
AutomaticEmergencyBrakingState.aidl.
Figure 2. AEB states defined in AutomaticEmergencyBrakingState.aidl.
This figure provides an example of AEB when the
USER_OVERRIDE
state is not supported. Supported states should be specified through the
getSupportedEnumValues()
API in AreaIdConfig.java.
Figure 3. AEB when the USER_OVERRIDE state isn't supported.
In the AEB example illustrated in Figure 4, the error that causes AEB to become unavailable
is highlighted. This demonstrates how values defined in
ErrorState.aidl
should be used. These errors don't result in an exception thrown by
CarPropertyManager and are instead shared with apps in the same way as any other
change to CarPropertyValue.
Figure 4. Error causes AEB to become unavailable.
Lane centering assist
Lane centering assist (LCA) provides three associated and defined properties.
Property
Values
LANE_CENTERING_ASSIST_ENABLED
VehiclePropertyType:BOOLEAN
LANE_CENTERING_ASSIST_STATE
Defined in
LaneCenteringAssistState.aidl
VehiclePropertyType:INT32
OTHER
ENABLED
ACTIVATION_REQUESTED
ACTIVATED
USER_OVERRIDE
FORCED_DEACTIVATION_WARNING
ErrorState
LANE_CENTERING_ASSIST_COMMAND
Defined in
LaneCenteringAssistCommand.aidl
VehiclePropertyType:INT32
ACTIVATE
DEACTIVATE
The following state diagram illustrates LCA when all the defined states in
LaneCenteringAssistState.aidl
are supported. Green lines can either be a command initiated from the
LANE_CENTERING_ASSIST_COMMAND
(when implemented) or initiated through another mechanism in the vehicle and reflect a state
change on the Android Automotive OS (AAOS).
Figure 5. LCA states defined in LaneCenteringAssistState.aidl.
This LCA example highlights an error that causes LCA to become unavailable. This
demonstrates how to use the values defined in
ErrorState.aidl.
These errors don't result in CarPropertyManager throwing an error and are
instead shared with apps in the same way that other changes to CarPropertyValue
change are shared.
Figure 6. Error causes LCA to become unavailable.
Hands-on detection
These three associated properties are defined for hands-on detection (HOD).
Property
Description
HANDS_ON_DETECTION_ENABLED
VehiclePropertyType:BOOLEAN
HANDS_ON_DETECTION_STATE
Defined in
HandsOnDetectionDriverState.aidl
VehiclePropertyType:INT32
OTHER
HANDS_ON
HANDS_OFF
ErrorState
HANDS_ON_DETECTION_WARNING
Defined in
HandsOnDetectionWarning.aidl
VehiclePropertyType:INT32
OTHER
NO_WARNING
WARNING
ErrorState
Illustrated below is an example of HOD, in which all the defined states in
HandsOnDetectionDriverState.aidl are supported.
Figure 7. HOD when all defined states in HandsOnDetectionDriverState.aidl are supported.
In addition to the HANDS_ON_DETECTION_STATE property, HOD also provides a separate
warning property, HANDS_ON_DETECTION_WARNING. The state diagram for the HOD warning values is
illustrated in Figure 8.
Figure 8. HOD when all defined values in HandsOnDetectionWarning.aidl are supported.
Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
Last updated 2026-06-17 UTC.
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