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Added in API level 1

Summary: Inherited Fields | Ctors | Methods | Inherited Methods

DataSetObservable

Kotlin |Java

public class DataSetObservable
extends Observable<DataSetObserver>

java.lang.Object
↳	android.database.Observable<android.database.DataSetObserver>
	↳	android.database.DataSetObservable

A specialization of Observable for DataSetObserver that provides methods for sending notifications to a list of DataSetObserver objects.

Summary

Inherited fields

From class android.database.Observable


    protected
    
    final
    ArrayList<T>

mObservers

The list of observers.

Public constructors
`DataSetObservable()`

Public methods
`void`	`notifyChanged()` Invokes `DataSetObserver.onChanged` on each observer.
`void`	`notifyInvalidated()` Invokes `DataSetObserver.onInvalidated` on each observer.

Inherited methods

From class


        
          android.database.Observable

`void`	`registerObserver(DataSetObserver observer)` Adds an observer to the list.
`void`	`unregisterAll()` Remove all registered observers.
`void`	`unregisterObserver(DataSetObserver observer)` Removes a previously registered observer.

From class


        
          java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Public constructors

DataSetObservable

public DataSetObservable ()

Public methods

notifyChanged

Added in API level 1

public void notifyChanged ()

Invokes DataSetObserver.onChanged on each observer. Called when the contents of the data set have changed. The recipient will obtain the new contents the next time it queries the data set.

notifyInvalidated

Added in API level 1

public void notifyInvalidated ()

Invokes DataSetObserver.onInvalidated on each observer. Called when the data set is no longer valid and cannot be queried again, such as when the data set has been closed.

Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.

Last updated 2026-08-03 UTC.

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