InvalidationTracker.Observer

Artifact: androidx.room:room-runtime

View Source

Added in 2.0.0

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Kotlin |Java

public abstract class InvalidationTracker.Observer

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An observer that can listen for changes in the database by subscribing to an InvalidationTracker.

Summary

Public constructors
Observer(@NonNull String[] tables)

Protected constructors
Observer(@NonNull String firstTable, @NonNull String rest) Creates an observer for the given tables and views.

Public methods
abstract void	onInvalidated(@NonNull Set<@NonNull String> tables) Invoked when one of the observed tables is invalidated (changed).

Public constructors

Observer

Added in 2.0.0

public Observer(@NonNull String[] tables)

Parameters
@NonNull String[] tables	The names of the tables this observer is interested in getting notified if they are modified.

Protected constructors

Observer

Added in 2.0.0

protected Observer(@NonNull String firstTable, @NonNull String rest)

Creates an observer for the given tables and views.

Parameters
@NonNull String firstTable	The name of the table or view.
@NonNull String rest	More names of tables or views.

Public methods

onInvalidated

Added in 2.0.0

public abstract void onInvalidated(@NonNull Set<@NonNull String> tables)

Invoked when one of the observed tables is invalidated (changed).

Parameters
@NonNull Set<@NonNull String> tables	A set of invalidated tables. When the observer is interested in multiple tables, this set can be used to distinguish which of the observed tables were invalidated. When observing a database view the names of underlying tables will be in the set instead of the view name.