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.
Summary
Public methods |
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abstract void |
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 |
This method will be called with a snapshot of the data at this location. |
Public methods
onCancelled
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
onDataChange
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.