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.

Node.LifecycleListener

AI-generated Key Takeaways

Node.LifecycleListener is an interface for receiving callbacks during a node's lifecycle events.
It provides methods to be notified when a node is activated (onActivated), deactivated (onDeactivated), and updated (onUpdated).
These methods receive the affected node as a parameter, and onUpdated also provides frame timing information.
Several classes, like RotationController and ScaleController, indirectly implement this interface.

public static interface Node.LifecycleListener

Known Indirect Subclasses

Interface definition for callbacks to be invoked when node lifecycle events occur.

abstract void	onActivated(Node node) Notifies the listener that `onActivate()` was called.
abstract void	onDeactivated(Node node) Notifies the listener that `onDeactivate()` was called.
abstract void	onUpdated(Node node, FrameTime frameTime) Notifies the listener that `onUpdate(FrameTime)` was called.

Notifies the listener that onActivate() was called.

node	the node that was activated

Notifies the listener that onDeactivate() was called.

node	the node that was deactivated

Notifies the listener that onUpdate(FrameTime) was called.

node	the node that was updated
frameTime	provides time information for the current frame