sqlite - Android row is not getting update -

i want update row values 0 or 1. here update method.where wrong code .

dbhelper.updatestarflag(actid, strstarflagmark);       public boolean updatestarflag(string str_activityid, string str_starflag)         {             sqlitedatabase db1 = getreadabledatabase();             contentvalues args = new contentvalues();             args.put(col_allpost_postactivityid, str_activityid);             args.put(col_allpost_starflag, str_starflag);             int = db1.update(table_allpost_table, args, col_allpost_postactivityid + "='"+str_activityid+"'", null);             return > 0;         } 

if want update something, need writable database. changed query little more in documentation sqlitedatabase

 public boolean updatestarflag(string str_activityid, string str_starflag)     {         sqlitedatabase db1 = getwriteabledatabase();         contentvalues args = new contentvalues();         args.put(col_allpost_postactivityid, str_activityid);         args.put(col_allpost_starflag, str_starflag);          int = db1.update(table_allpost_table, args, col_allpost_postactivityid + "= ? ", new string[]{str_activityid});         return > 0;     }