private void filterExisting() {
final DownloadIndexAdapter listAdapter = (DownloadIndexAdapter) getExpandableListAdapter();
final Map<String, String> listAlreadyDownloaded =
downloadListIndexThread.getDownloadedIndexFileNames();
final List<IndexItem> filtered = new ArrayList<IndexItem>();
for (IndexItem fileItem : listAdapter.getIndexFiles()) {
if (fileItem.isAlreadyDownloaded(listAlreadyDownloaded)) {
filtered.add(fileItem);
}
}
listAdapter.setIndexFiles(
filtered, IndexItemCategory.categorizeIndexItems(getClientContext(), filtered));
listAdapter.notifyDataSetChanged();
}
