android - FilterQueryProvider not updating ListView -

trying use filterqueryprovider function update contents of listview, characters entered filter, runquery function called, , new cursor filtered content returned, listview not update show new contents. docs state after runquery returns, changecursor called. isn't enough update listview display? code set filter is:

    madapter = new itemadapter(curs);     madapter.setfilterqueryprovider(new itemfilter());     setlistadapter(madapter); 

and filter class simply:

class itemfilter implements filterqueryprovider {     public cursor runquery(charsequence filter) {         return getnewcursor(filter);     } } 

the cursor getnewcursor correctly fetch subset of rows. have missed in getting listview update?