android - How to populate a ListView using a FirebaseListAdapter? -

i working on android project, allow users find nearest petrol pump's name, address, , importantly prices. have listview, want populate through firebase list adapter because using firebase project. after writing code getting nothing firebase -- it's blank screen on android phone (no error showing in android studio).

after writing setcontentview(lview); in end of oncreate() method , giving me error , activity crashes. got error firebase : com.firebase.client.firebaseexception: failed bounce type

import android.os.bundle; import android.support.v7.app.appcompatactivity; import android.view.view; import android.widget.listview; import android.widget.textview;  import com.firebase.client.firebase; import com.firebase.ui.firebaselistadapter;  public class testbezinpriser extends appcompatactivity {  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate); //  setcontentview(r.layout.activity_testbezinpriser);     listview lview = new listview(this);       firebase.setandroidcontext(this);     firebase ref = new firebase("https://xxxxx.firebaseio.com");      firebaselistadapter<benzin> adapter = new firebaselistadapter<benzin>(this, benzin.class, r.layout.listepriser, ref) {         @override         protected void populateview(view v, benzin s, int i) {             ((textview)v.findviewbyid(r.id.navnview)).settext(s.getname());             ((textview)v.findviewbyid(r.id.addressview)).settext(s.getaddress());             ((textview)v.findviewbyid(r.id.prisview)).settext(s.getprice()));          }     };     lview.setadapter(adapter);     setcontentview(lview);  } } 

and benzin class

public class benzin {  string address; string name ; string price;  public benzin(){  } public benzin (string name , string address , string price){     this.name = name;     this.address = address;     this.price = price; }  public string getaddress(){     return address; }  public string getname(){     return name; } public string getprice(){     return price; } 

}

xml layout listepriser

<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent">  <imageview     android:layout_width="80dp"     android:layout_height="50dp"     android:id="@+id/logoview"     android:layout_alignparenttop="true"     android:layout_alignparentstart="true"     android:layout_margintop="20dp"     android:src="@drawable/shell"     android:contentdescription="tankstation_billed" />  <textview     android:layout_width="70dp"     android:layout_height="25dp"     android:id="@+id/navnview"     android:layout_aligntop="@+id/logoview"     android:layout_toendof="@+id/logoview"     android:layout_marginstart="10dp"     android:textstyle="bold|italic"     android:textsize="15sp"     android:textcolor="#000000"     android:text="shell"     android:layout_margintop="5dp"     android:textisselectable="false" />  <textview     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="måløvhovedgade 38 , måløv"     android:id="@+id/addressview"     android:layout_alignbottom="@+id/logoview"     android:layout_alignstart="@+id/navnview"     android:layout_marginbottom="3dp"     android:textsize="12sp"     android:textcolor="#000000" />  <textview     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="10.99"     android:id="@+id/prisview"     android:layout_aligntop="@+id/navnview"     android:layout_alignparentend="true"     android:layout_marginright="10dp"     android:textcolor="#000000"     android:typeface="serif" /> 

database view

if @ full stack trace of failed bounce type exception, tell wrong.

but in case seems problem caused fact property names in json start uppercase letter. work:

public class benzin {     public string address;     public string name ;     public string price; }