Speed up playlist processing

        Iterator<FileEntry> iterator = mPlayLists.iterator();

        Cursor fileList = null;

        try {

            // use the files uri and projection because we need the format column,

            // but restrict the query to just audio files

            fileList = mMediaProvider.query(mFilesUri, FILES_PRESCAN_PROJECTION,

                    null, null, null, null);

                    "media_type=2", null, null, null);

            while (iterator.hasNext()) {

                FileEntry entry = iterator.next();

                // only process playlist files if they are new or have been modified since the last scan