com.firebase.ui.database

Interface ChangeEventListener

public interface ChangeEventListener

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	ChangeEventListener.EventType The type of event received when a child has been updated.

Method Summary

Modifier and Type	Method and Description
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.
void	onChildChanged(ChangeEventListener.EventType type, int index, int oldIndex) A callback for when a child has changed in FirebaseArray.
void	onDataChanged() This method will be triggered each time updates from the database have been completely processed.

Method Detail

onChildChanged

void onChildChanged(ChangeEventListener.EventType type,
                    int index,
                    int oldIndex)

A callback for when a child has changed in FirebaseArray.

Parameters:

type - The type of event received

index - The index at which the change occurred

oldIndex - If type is a moved event, the previous index of the moved child. For any other event, oldIndex will be -1.

onDataChanged

void onDataChanged()

This method will be triggered each time updates from the database have been completely processed. So the first time this method is called, the initial data has been loaded - including the case when no data at all is available. Each next time the method is called, a complete update (potentially consisting of updates to multiple child items) has been completed.

You would typically override this method to hide a loading indicator (after the initial load) or to complete a batch update to a UI element.

onCancelled

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.

Parameters:

error - A description of the error that occurred