how to get the object from firebase in android?

Question

I have user class like this

public class User{
int id;
String description;
String shortDescription;
String photo;

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public String getDescription() {
    return description;
}

public void setDescription(String description) {
    this.description = description;
}

public String getShortDescription() {
    return shortDescription;
}

public void setShortDescription(String shortDescription) {
    this.shortDescription = shortDescription;
}

public String getPhoto() {
    return photo;
}

public void setPhoto(String photo) {
    this.photo = photo;
}
}

i am fetching the user stored on my firebase using the FirebaseRecyclerAdapter like as shown below

 FirebaseRecyclerAdapter<User, UserHolder> adapter =
            new FirebaseRecyclerAdapter<User, UserHolder>(
                    User.class,
                    android.R.layout.two_line_list_item,
                    UserHolder.class,
                    mRef) {
                @Override
                protected void populateViewHolder(UserHolder userHolder, User u, int i) {
                    userHolder.mText.setText(u.getDescription());
                }
            };

But the issue is is when the firebase key of the user object is like

 > -KDY9Pna7XqgFkyCHKFJ

this then its working fine but if the firebase key is like

 > c5755a68-69a7-4464-956e-c2f94d9b387d

this unique id then it is giving an error

> com.firebase.client.FirebaseException: Failed to bounce to type

FATAL EXCEPTION: 
main Process: in.rofr, PID: 12399
com.firebase.client.FirebaseException: Failed to bounce to type
at com.firebase.client.DataSnapshot.getValue(DataSnapshot.java:183)
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$Adapter.onBindViewHolder(RecyclerView.java:5465)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5498)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4735)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4611)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1988)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1384)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1347)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:574)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3026)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:2903)
at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3277)
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.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:1183)
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)

What is the exact issue, i am not getting can anyone help me?

Thanks in advance !!!

can i know what is **s** in this line **userHolder.mText.setText(s.getDescription());** i dnt find where did you declare that one. — Kathi, Mar 23 '16 at 12:00
Still little confuse, Can you tell about **key**. is that key in firebase or key of Object while debug ? — Kathi, Mar 23 '16 at 12:18
Well the problem is JSON property does not maps correctly please look this [Answer](http://stackoverflow.com/a/32109104/5955593) — Kathi, Mar 23 '16 at 12:51
Without seeing a user in JSON (as text, no screenshot please) and the **full** stack trace (the more interesting error message is nested) it will be impossible to help. But the answer @Kathi linked is indeed a good start. :-) — Frank van Puffelen, Mar 23 '16 at 16:30

score 5 · Accepted Answer · edited May 23 '17 at 12:16

Try putting @JsonIgnoreProperties(ignoreUnknown = true) on top of the class like this

@JsonIgnoreProperties(ignoreUnknown = true)
public class UserModel {

}

This might work because Firebase uses Jackson library to serialise/deserialise JSON and the use of @JsonIgnoreProperties(ignoreUnknown = true) is to ignore new properties (properties that are not declared in the class) as stated here https://stackoverflow.com/a/5455563/2331705

how to get the object from firebase in android?

1 Answers1