使用合并光标

Question

我有 3 个对数据库的请求，它们返回 Cursor a、b、c。示例查询：

public Cursor SearchQueryMoscow (String query ){
         Cursor m;
          a = sqldb.query(true, DataBase.TABLE_NAME, new String[]{KEY_ROWID,ADRESS2,TIME2
                   ,PRICE2,OBJECT2,OPICANIE2,FINDWC2,DISTANSHIONMETRO2,CITY2},CITY2 + " IN ('ROMA') and ("
                    + " adress LIKE " + "'%" + query + "%'" 
                    + " OR gowc LIKE " + "'%" + query + "%'"
                    + " OR timework LIKE " + "'%" + query + "%'"
                    + " OR price LIKE " + "'%" + query + "%'"
                    + " OR mesto LIKE " + "'%" + query + "%'"
                    + " OR opicanie LIKE " + "'%" + query + "%'"
                    + " OR distanshionmetro LIKE " + "'%" + query + "%')"
                   , null, null, null, null, null); 
return a ;} 

如何使用 MergeCursor 组合三个游标的结果？ 我写道：

MergeCursor mergecursor = new MergeCursor(mCursors); 

如何进一步合并三个游标的结果？ 看到的示例