diff options
Diffstat (limited to 'android/arch/paging/KeyedDataSource.java')
| -rw-r--r-- | android/arch/paging/KeyedDataSource.java | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/android/arch/paging/KeyedDataSource.java b/android/arch/paging/KeyedDataSource.java index 8cf6829c..0d452946 100644 --- a/android/arch/paging/KeyedDataSource.java +++ b/android/arch/paging/KeyedDataSource.java @@ -103,10 +103,6 @@ import java.util.List; * @param <Value> Type of items being loaded by the DataSource. */ public abstract class KeyedDataSource<Key, Value> extends ContiguousDataSource<Key, Value> { - @Override - public final int countItems() { - return 0; // method not called, can't be overridden - } @Nullable @Override @@ -118,7 +114,14 @@ public abstract class KeyedDataSource<Key, Value> extends ContiguousDataSource<K @Override List<Value> loadBeforeImpl( int currentBeginIndex, @NonNull Value currentBeginItem, int pageSize) { - return loadBefore(getKey(currentBeginItem), pageSize); + List<Value> list = loadBefore(getKey(currentBeginItem), pageSize); + + if (list != null && list.size() > 1) { + // TODO: move out of keyed entirely, into the DB DataSource. + list = new ArrayList<>(list); + Collections.reverse(list); + } + return list; } @Nullable @@ -191,6 +194,8 @@ public abstract class KeyedDataSource<Key, Value> extends ContiguousDataSource<K /** @hide */ @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP) + @WorkerThread + @Override public NullPaddedList<Value> loadInitial( @Nullable Key key, int initialLoadSize, boolean enablePlaceholders) { if (isInvalid()) { |