I am trying to load data into a RecycleView from Firebase. But I get a conversion error.
com.google.firebase.database.DatabaseException: Can't convert object of type java.util.ArrayList to type uk.co.stableweb.kithunugee.model.Hymn
at com.google.android.gms.internal.zzaix.zzd(Unknown Source)
at com.google.android.gms.internal.zzaix.zzb(Unknown Source)
at com.google.android.gms.internal.zzaix.zza(Unknown Source)
at com.google.firebase.database.DataSnapshot.getValue(Unknown Source)
at com.google.firebase.database.DataSnapshot.getValue(Unknown Source)
at com.firebase.ui.database.FirebaseRecyclerAdapter.parseSnapshot(FirebaseRecyclerAdapter.java:147)
at com.firebase.ui.database.FirebaseRecyclerAdapter.getItem(FirebaseRecyclerAdapter.java:136)
at com.firebase.ui.database.FirebaseRecyclerAdapter.onBindViewHolder(FirebaseRecyclerAdapter.java:176)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5471)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5504)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4741)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4617)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:1994)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1390)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1353)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:574)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3028)
at android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java:2625)
at android.view.View.measure(View.java:18850)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:716)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:462)
at android.view.View.measure(View.java:18850)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5956)
at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:668)
at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:90)
at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1192)
at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:733)
at android.view.View.measure(View.java:18850)
at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:1075)
at android.view.View.measure(View.java:18850)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5956)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135)
at android.view.View.measure(View.java:18850)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5956)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:748)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:630)
at android.view.View.measure(View.java:18850)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5956)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at android.view.View.measure(View.java:18850)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5956)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:748)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:630)
at android.view.View.measure(View.java:18850)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5956)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2671)
at android.view.View.measure(View.java:18850)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2107)
This is how I load data from RecycleView.
DatabaseReference ref = FirebaseDatabase.getInstance().getReference();
mRecyclerViewAdapter = new FirebaseRecyclerAdapter<Hymn, HymnHolder>(Hymn.class, R.layout.hymn_row, HymnHolder.class, ref) {
@Override
protected void populateViewHolder(HymnHolder viewHolder, Hymn hymn, int position) {
viewHolder.setTitle(hymn.getTitle());
viewHolder.setIndex(String.valueOf(hymn.getIndex()));
}
};
mRecyclerViewAdapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
@Override
public void onItemRangeInserted(int positionStart, int itemCount) {
mLayoutManager.smoothScrollToPosition(recyclerView, null, mRecyclerViewAdapter.getItemCount());
}
});
recyclerView.setAdapter(mRecyclerViewAdapter);
And my ViewHolder class,
public class HymnHolder extends RecyclerView.ViewHolder {
View mView;
public HymnHolder(View itemView) {
super(itemView);
mView = itemView;
}
public void setTitle(String name) {
TextView field = (TextView) mView.findViewById(R.id.title);
field.setText(name);
}
public void setIndex(String index) {
TextView field = (TextView) mView.findViewById(R.id.index);
field.setText(index);
}
}
And this is my model.
public class Hymn {
private int index;
private String title;
private String content;
public int getIndex() {
return index;
}
public void setIndex(int index) {
this.index = index;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
}
Here is the structure of my Firebase database.
I referenced this tutorial on Firebase UI. There were several previous questions on this issue, but it did not seem to me. If you have any hints of this problem, it would be very helpful.
Isuru source
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