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.

TwistGesture.OnGestureEventListener

public static interface TwistGesture.OnGestureEventListener

Interface definition for callbacks to be invoked by a TwistGesture.

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

abstract void	onFinished(TwistGesture gesture)
abstract void	onUpdated(TwistGesture gesture)

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Last updated 2020-03-21 UTC.