title: Fail to display data as ListView from Firebase
body: <p>My goal is just to retrieve data from Firebase and then output it as ListView in Android (No need to push anything back to the database). I tried to learn from the <a href="https://github.com/firebase/AndroidChat" rel="nofollow noreferrer">AndroidChat</a> example and created my own class and my own Custom List Adapter class instead of Chat.java and ChatListAdapter.java (as in the orignal example). I also changed the references to my Firebase and resemble my data structure to that of <a href="https://android-chat.firebaseio-demo.com/" rel="nofollow noreferrer">https://android-chat.firebaseio-demo.com/</a>. Below is my data structure: (Everything below is just the same as the AndroidChat example, just different variable names)</p>
  
  <p><img src="https://i.stack.imgur.com/poUUc.png" alt="enter image description here"></p>
  
  <p>My own class:</p>
  
  <pre><code>package com.firebase.androidchat;
  
  
  public class MenuItem {
  
      private String food;
      private String weekDay;
  
      // Required default constructor for Firebase object mapping
      @SuppressWarnings("unused")
      private MenuItem() { }
  
      MenuItem(String food, String weekDay) {
          this.food = food;
          this.weekDay = weekDay;
      }
  
      public String getFood() {
          return food;
      }
  
      public String getWeekDay() {
          return weekDay;
      }
  }
  </code></pre>
  
  <p>My own custom list adapter class:</p>
  
  <pre><code>package com.firebase.androidchat;
  
  import android.app.Activity;
  import android.view.View;
  import android.widget.TextView;
  import com.firebase.client.Query;
  
  public class MenuListAdapter extends FirebaseListAdapter&lt;MenuItem&gt; {
  
      public MenuListAdapter(Query ref, Activity activity, int layout) {
          super(ref, MenuItem.class, layout, activity);
      }
  
      @Override
      protected void populateView(View view, MenuItem item) {
          // Map a MenuItem object to an entry in our listview
          String weekDay = item.getWeekDay();
          TextView authorText = (TextView)view.findViewById(R.id.author);
          authorText.setText(weekDay + ": ");
          ((TextView)view.findViewById(R.id.message)).setText(item.getFood());
      }
  }
  </code></pre>
  
  <p>My MainActivity in brief:</p>
  
  <pre><code>public class MainActivity extends ListActivity {
  
      // TODO: change this to your own Firebase URL
      private static final String FIREBASE_URL = "https://barlaurea.firebaseio.com/";
  
      private Firebase ref;
      private ValueEventListener connectedListener;
      private MenuListAdapter menuListAdapter;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);       
          // Setup our Firebase ref
          ref = new Firebase(FIREBASE_URL).child("menu");
      }
  
      @Override
      public void onStart() {
          super.onStart();
          // Setup our view and list adapter. Ensure it scrolls to the bottom as data changes
          final ListView listView = getListView();
          // Tell our list adapter that we only want 50 messages at a time
          menuListAdapter = new MenuListAdapter(ref.limit(50), this, R.layout.chat_message);
          listView.setAdapter(menuListAdapter);
  
          menuListAdapter.registerDataSetObserver(new DataSetObserver() {
              @Override
              public void onChanged() {
                  super.onChanged();
                  listView.setSelection(menuListAdapter.getCount() - 1);
              }
          });
  </code></pre>
  
  <p>When I started the Run button, my device displayed a toast message "Connected to Firebase" but the screen remained blank and then crashed after a few seconds, showing a toast "Unfortunately, Firebase Chat has stopped". What did I miss here? Thank you!</p>
  
  <p>Edit: Here is my LogCat view: Everything turn red at the "FAIL EXCEPTION: main line"
  Also the original AndroidChat run fine on my device..</p>
  
  <pre><code>02-07 16:17:35.105: D/dalvikvm(31766): GC_CONCURRENT freed 313K, 16% free 7795K/9223K, paused 14ms+16ms, total 65ms
  02-07 16:17:36.000: D/dalvikvm(31766): GC_CONCURRENT freed 494K, 17% free 7874K/9479K, paused 2ms+3ms, total 34ms
  02-07 16:17:36.365: D/dalvikvm(31766): GC_CONCURRENT freed 482K, 17% free 7923K/9543K, paused 19ms+21ms, total 142ms
  02-07 16:17:36.495: D/AndroidRuntime(31766): Shutting down VM
  02-07 16:17:36.495: W/dalvikvm(31766): threadid=1: thread exiting with uncaught exception (group=0x41fb02a0)
  02-07 16:17:36.520: E/AndroidRuntime(31766): FATAL EXCEPTION: main
  02-07 16:17:36.520: E/AndroidRuntime(31766): com.firebase.client.FirebaseException: Failed to bounce to type
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.firebase.client.DataSnapshot.getValue(DataSnapshot.java:185)
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.firebase.androidchat.FirebaseListAdapter$1.onChildAdded(FirebaseListAdapter.java:63)
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.firebase.client.core.ChildListenerContainer$1.run(ChildListenerContainer.java:52)
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at android.os.Handler.handleCallback(Handler.java:615)
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at android.os.Handler.dispatchMessage(Handler.java:92)
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at android.os.Looper.loop(Looper.java:137)
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at android.app.ActivityThread.main(ActivityThread.java:4947)
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at java.lang.reflect.Method.invokeNative(Native Method)
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at java.lang.reflect.Method.invoke(Method.java:511)
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at dalvik.system.NativeStart.main(Native Method)
  02-07 16:17:36.520: E/AndroidRuntime(31766): Caused by: com.shaded.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "weekday" (class com.firebase.androidchat.MenuItem), not marked as ignorable (2 known properties: , "weekDay", "food"])
  02-07 16:17:36.520: E/AndroidRuntime(31766):  at [Source: java.io.StringReader@42826fc8; line: 1, column: 13] (through reference chain: com.firebase.androidchat.MenuItem["weekday"])
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.shaded.fasterxml.jackson.databind.DeserializationContext.reportUnknownProperty(DeserializationContext.java:555)
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.shaded.fasterxml.jackson.databind.deser.std.StdDeserializer.handleUnknownProperty(StdDeserializer.java:708)
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.shaded.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownProperty(BeanDeserializerBase.java:1160)
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.shaded.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:315)
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.shaded.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:121)
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.shaded.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2888)
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.shaded.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2034)
  02-07 16:17:36.520: E/AndroidRuntime(31766):    at com.firebase.client.DataSnapshot.getValue(DataSnapshot.java:181)
  02-07 16:17:36.520: E/AndroidRuntime(31766):    ... 11 more
  </code></pre>