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DataSetObservable.javaAPI DocAndroid 5.1 API2117Thu Mar 12 22:22:10 GMT 2015android.database

DataSetObservable

public class DataSetObservable extends Observable
A specialization of {@link Observable} for {@link DataSetObserver} that provides methods for sending notifications to a list of {@link DataSetObserver} objects.

Fields Summary
Constructors Summary
Methods Summary
public voidnotifyChanged()
Invokes {@link 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.

        synchronized(mObservers) {
            // since onChanged() is implemented by the app, it could do anything, including
            // removing itself from {@link mObservers} - and that could cause problems if
            // an iterator is used on the ArrayList {@link mObservers}.
            // to avoid such problems, just march thru the list in the reverse order.
            for (int i = mObservers.size() - 1; i >= 0; i--) {
                mObservers.get(i).onChanged();
            }
        }
public voidnotifyInvalidated()
Invokes {@link 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 Called when the data set is no longer valid and cannot be queried again, such as when the data set has been closed.

        synchronized (mObservers) {
            for (int i = mObservers.size() - 1; i >= 0; i--) {
                mObservers.get(i).onInvalidated();
            }
        }