So, im having no problems adding objects to the firebase database but when trying to retrieve the added objects from the database through the recyclerview using the Ui library i get the following error:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: smarthousebillsplitter, PID: 900
com.firebase.client.FirebaseException: Failed to bounce to type
at com.firebase.client.DataSnapshot.getValue(DataSnapshot.java:185)
at com.firebase.ui.FirebaseRecyclerAdapter.parseSnapshot(FirebaseRecyclerAdapter.java:161)
at com.firebase.ui.FirebaseRecyclerAdapter.getItem(FirebaseRecyclerAdapter.java:150)
at com.firebase.ui.FirebaseRecyclerAdapter.onBindViewHolder(FirebaseRecyclerAdapter.java:190)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5217)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5250)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4487)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4363)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1961)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1370)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1333)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:562)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2900)
at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3071)
at android.view.View.layout(View.java:15689)
at android.view.ViewGroup.layout(ViewGroup.java:5040)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1076)
at android.view.View.layout(View.java:15689)
at android.view.ViewGroup.layout(ViewGroup.java:5040)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
at android.view.View.layout(View.java:15689)
at android.view.ViewGroup.layout(ViewGroup.java:5040)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
at android.view.View.layout(View.java:15689)
at android.view.ViewGroup.layout(ViewGroup.java:5040)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
at android.view.View.layout(View.java:15689)
at android.view.ViewGroup.layout(ViewGroup.java:5040)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)
at android.view.View.layout(View.java:15689)
at android.view.ViewGroup.layout(ViewGroup.java:5040)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:579)
at android.widget.FrameLayout.onLayout(FrameLayout.java:514)
at android.view.View.layout(View.java:15689)
at android.view.ViewGroup.layout(ViewGroup.java:5040)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2116)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1873)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1084)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5990)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
at android.view.Choreographer.doCallbacks(Choreographer.java:580)
at android.view.Choreographer.doFrame(Choreographer.java:550)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
at android.os.Handler.handleCallback(Handler.java:746)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5343)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)
Caused by: com.fasterxml.jackson.databind.JsonMappin
Here is the recyclerview :
public class ExpenseFragment extends Fragment {
private RecyclerView ExpenseRecyclerView;
Firebase ExpenseRef = new Firebase(Constants.Firebase_URL).child("Expense");
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
Firebase.setAndroidContext(getActivity());
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_expense , container, false);
ExpenseRecyclerView = (RecyclerView) view.findViewById(R.id.Expense_Recycler_View);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getActivity());
ExpenseRecyclerView.setLayoutManager(layoutManager);
FirebaseRecyclerAdapter<Expense,ExpenseHolder> mRecyclerAdapter = new FirebaseRecyclerAdapter<Expense, ExpenseHolder>(Expense.class ,
R.layout.custom_expense_row_layout,ExpenseHolder.class, ExpenseRef ) {
@Override
protected void populateViewHolder(ExpenseHolder expenseHolder, Expense expense, int i) {
expenseHolder.nameTextView.setText(expense.getName());
expenseHolder.amountTextView.setText(expense.getAmount());
expenseHolder.createdByTextView.setText(expense.getCreatedBy());
expenseHolder.shoppingImageView.setImageResource(R.drawable.shopping);
}
};
ExpenseRecyclerView.setAdapter(mRecyclerAdapter);
return view;
}
public static class ExpenseHolder extends RecyclerView.ViewHolder {
private TextView nameTextView;
private TextView amountTextView;
private TextView createdByTextView;
private ImageView shoppingImageView;
public ExpenseHolder(View itemView) {
super(itemView);
nameTextView = (TextView) itemView.findViewById(R.id.name);
amountTextView = (TextView) itemView.findViewById(R.id.amount);
createdByTextView = (TextView) itemView.findViewById(R.id.CreatedBy);
shoppingImageView = (ImageView) itemView.findViewById(R.id.ExpenseImage);
}
}
}
Here is the java model class:
public class Expense {
private String amount;
private String createdBy;
private String name;
public Expense() {
}
public Expense(String amount, String createdBy, String name) {
this.amount = amount;
this.createdBy = createdBy;
this.name = name;
}
public String getName() {
return name;
}
public String getAmount() {
return amount;
}
public String getCreatedBy() {
return createdBy;
}
}
and here is the object in the database im trying to retrieve :
Debug trace
You're using a ListAdapter to show a single Expense. That means that each child of the ref is a single property amount, createdBy or name.
D/EventRaiser: Raising /Expense: CHILD_ADDED: { createdBy: anon }
D/EventRaiser: Raising /Expense: CHILD_ADDED: { name: BT bill }
The FirebaseRecyclerAdapter is made to work with a list of objects, i.e. a list of Expense objects. Once you create a list of expenses, it will work better.
