42 lines
1.4 KiB
Java
42 lines
1.4 KiB
Java
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/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.database;
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/**
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* Receives call backs when a data set has been changed, or made invalid. The typically data sets
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* that are observed are {@link Cursor}s or {@link android.widget.Adapter}s.
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* DataSetObserver must be implemented by objects which are added to a DataSetObservable.
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*/
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public abstract class DataSetObserver {
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/**
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* This method is called when the entire data set has changed,
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* most likely through a call to {@link Cursor#requery()} on a {@link Cursor}.
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*/
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public void onChanged() {
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// Do nothing
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}
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/**
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* This method is called when the entire data becomes invalid,
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* most likely through a call to {@link Cursor#deactivate()} or {@link Cursor#close()} on a
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* {@link Cursor}.
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*/
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public void onInvalidated() {
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// Do nothing
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}
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}
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