ContentObserver

Creates a content observer.

Returns true if this observer is interested receiving self-change notifications. Subclasses should override this method to indicate whether the observer is interested in receiving notifications for changes that it made to the content itself.

Dispatches a change notification to the observer. Includes the changed content Uri when available.

If a Handler was supplied to the ContentObserver constructor, then a call to the onChange(boolean) method is posted to the handler's message queue. Otherwise, the onChange(boolean) method is invoked immediately on this thread.

Dispatches a change notification to the observer.

If a Handler was supplied to the ContentObserver constructor, then a call to the onChange(boolean) method is posted to the handler's message queue. Otherwise, the onChange(boolean) method is invoked immediately on this thread.

This method is called when a content change occurs. Includes the changed content Uri when available.

Subclasses should override this method to handle content changes. To ensure correct operation on older versions of the framework that did not provide a Uri argument, applications should also implement the onChange(boolean) overload of this method whenever they implement the onChange(boolean, Uri) overload.

Example implementation:

 // Implement the onChange(boolean) method to delegate the change notification to
 // the onChange(boolean, Uri) method to ensure correct operation on older versions
 // of the framework that did not have the onChange(boolean, Uri) method.
 @Override
 public void onChange(boolean selfChange) {
     onChange(selfChange, null);
 }

 // Implement the onChange(boolean, Uri) method to take advantage of the new Uri argument.
 @Override
 public void onChange(boolean selfChange, Uri uri) {
     // Handle change.
 }
 

This method is called when a content change occurs.

Subclasses should override this method to handle content changes.