Sceneform SDK for Android was open sourced and archived (github.com/google-ar/sceneform-android-sdk) with version 1.16.0.
This site (developers.google.com/sceneform) serves as the documentation archive for the previous version, Sceneform SDK for Android 1.15.0.
Do not use version 1.17.0 of the Sceneform Maven artifacts.
The 1.17.1 Maven artifacts can be used. Other than the version, however, the 1.17.1 artifacts are identical to the 1.15.0 artifacts.

DragGesture.OnGestureEventListener

Page Summary

DragGesture.OnGestureEventListener defines callbacks invoked by a DragGesture, enabling interaction with drag events.
It inherits methods like onFinished and onUpdated from BaseGesture.OnGestureEventListener to handle drag gesture updates and completion.
These methods provide access to the DragGesture object, allowing developers to respond to drag interactions within AR scenes.

public static interface DragGesture.OnGestureEventListener

Interface definition for callbacks to be invoked by a DragGesture.

From interface com.google.ar.sceneform.ux.BaseGesture.OnGestureEventListener

abstract void	onFinished(DragGesture gesture)
abstract void	onUpdated(DragGesture gesture)