How to update User information on Parse.com, in Android? -

i'm trying update user's information on parse.com, , worked 1 time , never works anymore. don't know why.

here code.

parseuser pu = parseuser.getcurrentuser(); string userid = pu.getobjectid();  parsequery<parseuser> query = parseuser.getquery(); query.getinbackground(userid, new getcallback<parseuser>() {     @override     public void done(parseuser parseuser, parseexception e) {         if (e == null) {             string playername= displaynameedittext.gettext().tostring();             parseuser.put("playername", playername);             string teamname= emailedittext.gettext().tostring();             parseuser.put("teamname", teamname);             string phone = phoneedittext.gettext().tostring();             parseuser.put("phone", phone);               parseuser.saveinbackground();         }      } }); 

any suggestions?