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author | The Android Open Source Project <initial-contribution@android.com> | 2008-10-21 07:00:00 -0700 |
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committer | The Android Open Source Project <initial-contribution@android.com> | 2008-10-21 07:00:00 -0700 |
commit | 54b6cfa9a9e5b861a9930af873580d6dc20f773c (patch) | |
tree | 35051494d2af230dce54d6b31c6af8fc24091316 /core/java/android/database/DataSetObserver.java | |
download | frameworks_base-54b6cfa9a9e5b861a9930af873580d6dc20f773c.zip frameworks_base-54b6cfa9a9e5b861a9930af873580d6dc20f773c.tar.gz frameworks_base-54b6cfa9a9e5b861a9930af873580d6dc20f773c.tar.bz2 |
Initial Contribution
Diffstat (limited to 'core/java/android/database/DataSetObserver.java')
-rw-r--r-- | core/java/android/database/DataSetObserver.java | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/core/java/android/database/DataSetObserver.java b/core/java/android/database/DataSetObserver.java new file mode 100644 index 0000000..28616c8 --- /dev/null +++ b/core/java/android/database/DataSetObserver.java @@ -0,0 +1,41 @@ +/* + * Copyright (C) 2007 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package android.database; + +/** + * Receives call backs when a data set has been changed, or made invalid. The typically data sets + * that are observed are {@link Cursor}s or {@link android.widget.Adapter}s. + * DataSetObserver must be implemented by objects which are added to a DataSetObservable. + */ +public abstract class DataSetObserver { + /** + * This method is called when the entire data set has changed, + * most likely through a call to {@link Cursor#requery()} on a {@link Cursor}. + */ + public void onChanged() { + // Do nothing + } + + /** + * This method is called when the entire data becomes invalid, + * most likely through a call to {@link Cursor#deactivate()} or {@link Cursor#close()} on a + * {@link Cursor}. + */ + public void onInvalidated() { + // Do nothing + } +} |