DatasourceObservable.java 文件源码

/**
 * Notifies the registered observers that the data have been removed from the datasource.
 * Note that method can be called multiple times.
 *
 * @param positionStart Position of the first data item that was removed.
 * @param itemCount     Number of the data items removed.
 */
public void notifyItemRangeRemoved(@IntRange(from = 0) final int positionStart,
                                   @IntRange(from = 0) final int itemCount) {
    final int size = mObservers.size();
    for (int i = size - 1; i >= 0; i--) {
        mObservers.get(i).onItemRangeRemoved(positionStart, itemCount);
    }
}