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

ValueEventListener | Firebase SDKs for Android

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public interface ValueEventListener

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

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.

This method will be called with a snapshot of the data at this location.

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 Database rules. For more information on securing your data, see: Security Quickstart

abstract void onDataChange(@NonNull 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.

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Last updated 2025-07-21 UTC.

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