android - Why is Parse Query Adapter always empty? -

i trying fill list parse query adapter empty. following tutorial provided parse (https://parse.com/tutorials/parse-query-adapter). please tell me if doing wrong. how can make work ? thank

public class brandsfragment extends fragment {  private parsequeryadapter mainadapter;   @override  public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     sethasoptionsmenu(true);     mainadapter = new parsequeryadapter(getactivity(), "brands");     mainadapter.settextkey("brandname");  }    @override public view oncreateview(layoutinflater inflater, viewgroup container,                          bundle savedinstancestate) {     view rootview = inflater.inflate(r.layout.fragment_brands, container, false);      listview listfollowingview = (listview) rootview.findviewbyid(r.id.brands_list);     brands_list.setadapter(mainadapter);     mainadapter.loadobjects();      if(mainadapter.isempty()){         toast.maketext(getactivity(),"empty",toast.length_short).show();     }  } } 

layout :

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingleft="@dimen/activity_horizontal_margin" android:paddingright="@dimen/activity_horizontal_margin" android:paddingtop="@dimen/activity_vertical_margin" android:paddingbottom="@dimen/activity_vertical_margin" tools:context="com.swipeit.swipeit.brandsactivity$placeholderfragment">  <listview     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:id="@+id/brands_list" />  </relativelayout>