android获取系统自带浏览器书签

刚刚接手一个备份系统浏览器书签的模块，现在把代码贴出来，另外有几点疑问请路过的大神指教

1、根据官方api应该是有以下几个字段是可以获取的

但是除了TITLE和URL能获取其他的都会报java.lang.IllegalStateException: Couldn‘t read row 0, col -1 from CursorWindow.  Make sure the Cursor is initialized correctly before accessing data from it.异常

2、是不是只能获得系统自带浏览器书签？如果我装的是百度或其他浏览器建的书签是不是就得不到了？

以下是我的代码片段

// 按访问时间排序
        String orderBy = Browser.BookmarkColumns.VISITS + " DESC";
        // flag=1表示书签
        String whereClause = Browser.BookmarkColumns.BOOKMARK + " = 1 ";
        ContentResolver cr = context.getContentResolver();
        Cursor cursor = cr.query(Browser.BOOKMARKS_URI,
                Browser.HISTORY_PROJECTION, whereClause, null, orderBy);  

        while (cursor != null && cursor.moveToNext()) {
            BookMark bookMark = new BookMark();
            // TODO 可能为空的字段
//          String id = cursor.getString(cursor
//                  .getColumnIndex(Browser.BookmarkColumns._ID));
//          if (id != null)
//              bookMark.set_id(id);
//
//          String count = cursor.getString(cursor
//                  .getColumnIndex(Browser.BookmarkColumns._COUNT));
//          if (count != null)
//              bookMark.set_count(count);  

            String title = cursor.getString(cursor
                    .getColumnIndex(Browser.BookmarkColumns.TITLE));
            if (title != null)
                bookMark.setTitle(title);  

            String url = cursor.getString(cursor
                    .getColumnIndex(Browser.BookmarkColumns.URL));
            if (url != null)
                bookMark.setUrl(url);
            byte[] b = cursor.getBlob(cursor
                    .getColumnIndex(Browser.BookmarkColumns.FAVICON));
            if (b != null) {
                bookMark.setFavicon((BitmapFactory.decodeByteArray(b, 0,
                        b.length)));
            } else {
                bookMark.setFavicon(null);
            }  

//          bookMark.setCreated(cursor.getString(cursor
//                  .getColumnIndex(Browser.BookmarkColumns.CREATED)));
//          bookMark.setDate(cursor.getString(cursor
//                  .getColumnIndex(Browser.BookmarkColumns.DATE)));
//          bookMark.setVisits((cursor.getString(cursor
//                  .getColumnIndex(Browser.BookmarkColumns.VISITS))));
//          bookMarks.add(bookMark);
            bookMarks.add(bookMark);
        }  

        cursor.close();
        JSONObject jso = listTojsoJsonObject(bookMarks);
        return jso.toString();