Observer

Kotlin |Java

abstract class Observer

kotlin.Any
↳	androidx.room.InvalidationTracker.Observer

An observer that can listen for changes in the database.

Summary

Public constructors
`<init>(@NonNull tables: Array<String!>)` Observes the given list of tables and views.

Protected constructors
`<init>(@NonNull firstTable: String, vararg rest: String!)` Observes the given list of tables and views.

Public methods
abstract Unit	`onInvalidated(@NonNull tables: MutableSet<String!>)` Called when one of the observed tables is invalidated in the database.

Observer(@NonNull tables: Array<String!>)

Observes the given list of tables and views.

Parameters
`tables`	Array<String!>: The list of tables or views to observe for changes.

protected Observer(
    @NonNull firstTable: String, 
    vararg rest: String!)

Observes the given list of tables and views.

Parameters
`firstTable`	String: The name of the table or view.
`rest`	String!: More names of tables or views.

abstract fun onInvalidated(@NonNull tables: MutableSet<String!>): Unit

Called when one of the observed tables is invalidated in the database.

Parameters
`tables`	MutableSet<String!>: A set of invalidated tables. This is useful when the observer targets multiple tables and you want to know which table is invalidated. This will be names of underlying tables when you are observing views.