android - AutoCompleteTextView doesn't show dropdown, got warning -

i have arraylist 60-70 elements in it. set adapter autocompletetextview follows.

autocompletetextview  mrecipient = (autocompletetextview) this.findviewbyid(r.id.recipient);         mrecipient.setthreshold(1);         log.i("array list", ""+names);// here got arraylist         arrayadapter<string> nameadapter=new arrayadapter<string>(myclass.this, android.r.layout.simple_list_item_1, names);         mrecipient.setadapter(nameadapter); 

but dropdown list doesn't show , got warning(not errror) in logcat.

04-21 17:15:53.017: w/filter(15093): exception occured during performfiltering()! 04-21 17:15:53.017: w/filter(15093): java.lang.nullpointerexception 04-21 17:15:53.017: w/filter(15093):    @ android.widget.arrayadapter$arrayfilter.performfiltering(arrayadapter.java:437) 04-21 17:15:53.017: w/filter(15093):    @ android.widget.filter$requesthandler.handlemessage(filter.java:234) 04-21 17:15:53.017: w/filter(15093):    @ android.os.handler.dispatchmessage(handler.java:99) 04-21 17:15:53.017: w/filter(15093):    @ android.os.looper.loop(looper.java:123) 04-21 17:15:53.017: w/filter(15093):    @ android.os.handlerthread.run(handlerthread.java:60) 

also have listview below this, empty now.

can figure out warning means?

the warning comes following code snippet in arrayadapter.performfiltering(charsequence):

 string prefixstring = prefix.tostring().tolowercase();  // entered user  final arraylist<t> values = moriginalvalues;  final int count = values.size();  final arraylist<t> newvalues = new arraylist<t>(count); // returned  (int = 0; < count; i++) {      final t value = values.get(i);                      // in case, 'value' null @ times      final string valuetext = value.tostring().tolowercase();  // warning       // first match against whole, non-splitted value      if (valuetext.startswith(prefixstring)) {          newvalues.add(value);      } else {          final string[] words = valuetext.split(" ");          final int wordcount = words.length;          (int k = 0; k < wordcount; k++) {              if (words[k].startswith(prefixstring)) {                  newvalues.add(value);                  break;              }          }      }  } 

so, check null values in names.