Firebase Docs Reference OnCompleteListener public interface OnCompleteListener Listener called when a Task completes. See Also addOnCompleteListener(OnCompleteListener) Public Method Summary abstract void onComplete(Task<T> task) Called when the Task completes. Public Methods public abstract void onComplete (Task<T> task) Called when the Task completes. Parameters task the completed Task. Never null Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated April 21, 2017.