public interface

ValueEventListener

com.google.firebase.database.ValueEventListener

Class Overview

Classes implementing this interface can be used to receive events about data changes at a location. Attach the listener to a location user addValueEventListener(ValueEventListener).

Summary

Public Methods
abstract void onCancelled(DatabaseError error)
This method will be triggered in the event that this listener either failed at the server, or is removed as a result of the security and Firebase Database rules.
abstract void onDataChange(DataSnapshot snapshot)
This method will be called with a snapshot of the data at this location.

Public Methods

public abstract void onCancelled (DatabaseError error)

This method will be triggered in the event that this listener either failed at the server, or is removed as a result of the security and Firebase Database rules. For more information on securing your data, see: Security Quickstart

Parameters
error DatabaseError: A description of the error that occurred

public abstract void onDataChange (DataSnapshot snapshot)

This method will be called with a snapshot of the data at this location. It will also be called each time that data changes.

Parameters
snapshot DataSnapshot: The current data at the location