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Showing content from https://firebase.google.com/docs/reference/android/com/google/firebase/database/ChildEventListener below:

ChildEventListener | Firebase SDKs for Android

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public interface ChildEventListener

Classes implementing this interface can be used to receive events about changes in the child locations of a given DatabaseReference ref. Attach the listener to a location using addChildEventListener and the appropriate method will be triggered when changes occur.

abstract void onCancelled(@NonNull 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 rules. For more information on securing your data, see: Security Quickstart

abstract void onChildAdded(
    @NonNull DataSnapshot snapshot,
    @Nullable String previousChildName
)

This method is triggered when a new child is added to the location to which this listener was added.

An immutable snapshot of the data at the new child location

The key name of sibling location ordered before the new child. This will be null for the first child node of a location.

abstract void onChildChanged(
    @NonNull DataSnapshot snapshot,
    @Nullable String previousChildName
)

This method is triggered when the data at a child location has changed.

An immutable snapshot of the data at the new data at the child location

The key name of sibling location ordered before the child. This will be null for the first child node of a location.

abstract void onChildMoved(
    @NonNull DataSnapshot snapshot,
    @Nullable String previousChildName
)

This method is triggered when a child location's priority changes. See setPriority and Ordered Data for more information on priorities and ordering data.

An immutable snapshot of the data at the location that moved.

The key name of the sibling location ordered before the child location. This will be null if this location is ordered first.

abstract void onChildRemoved(@NonNull DataSnapshot snapshot)

This method is triggered when a child is removed from the location to which this listener was added.

An immutable snapshot of the data at the child that was removed.

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Last updated 2025-07-21 UTC.

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