Hand tracking
This page supplements the XR Hands manual and only contains information about APIs where Google's Android XR runtime exhibits platform-specific behavior.
Important
You must ensure to configure the appropriate Permissions to use hand tracking features on Android XR.
Permissions
The XRHandSubsystem in Unity's XR Hands package requires an Android system permission on the Android XR runtime. Your user must grant your app the android.permission.HAND_TRACKING
permission before it can receive hand tracking data.
Note
The hand tracking subsystem starts immediately after OpenXR is initialized. Google's Android XR runtime logs an error every frame that the hand tracking subsystem is running and the required permission has not been granted.
Use this example code to request the required permission if it hasn't already been granted:
const string k_Permission = "android.permission.HAND_TRACKING";
#if UNITY_ANDROID
void Start()
{
if (!Permission.HasUserAuthorizedPermission(k_Permission))
{
var callbacks = new PermissionCallbacks();
callbacks.PermissionDenied += OnPermissionDenied;
callbacks.PermissionGranted += OnPermissionGranted;
Permission.RequestUserPermission(k_Permission, callbacks);
}
}
void OnPermissionDenied(string permission)
{
}
void OnPermissionGranted(string permission)
{
}
#endif // UNITY_ANDROID
For a code sample that involves multiple permissions in a single request, refer to the Permissions page.
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