android - auth - firebaseui version firebase play services version

Firebase populateViewHolder nunca se llama

Question

Tengo debajo de la estructura en mi consola firebase. Estoy tratando de leer los valores y mostrar todos los usuarios pero populateViewHolder nunca se llama.

 users
+OW5BYennVRXvfzOjfKpup9rZEYv2
-email: "[email protected]"
-username: "abc"

Mientras esté en el código a continuación, recibo el recuento de elementos como 1

 mAdapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
@Override
public void onItemRangeInserted(int positionStart, int itemCount) {
super.onItemRangeInserted(positionStart, itemCount);
int friendlyMessageCount = mAdapter.getItemCount();
int lastVisiblePosition =
mManager.findLastCompletelyVisibleItemPosition();
// If the recycler view is initially being loaded or the
// user is at the bottom of the list, scroll to the bottom
// of the list to show the newly added message.
if (lastVisiblePosition == -1 ||
(positionStart >= (friendlyMessageCount - 1) &&
lastVisiblePosition == (positionStart - 1))) {
recyclerView.scrollToPosition(positionStart);
}
}
}); 

Aquí está mi código

 @Override
public View onCreateView (LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View rootView = inflater.inflate(R.layout.fragment_home_page, container, false);
mDatabase = FirebaseDatabase.getInstance().getReference();
recyclerView = (RecyclerView) rootView.findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
return rootView;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mManager = new LinearLayoutManager(getActivity());
mManager.setReverseLayout(true);
mManager.setStackFromEnd(true);
Query postsQuery = mDatabase.child("users");
mAdapter = new FirebaseRecyclerAdapter<User, PostViewHolder>(User.class, R.layout.post,
PostViewHolder.class, postsQuery) {
@Override
protected void populateViewHolder(PostViewHolder viewHolder, User model, int position) {
final DatabaseReference postRef = getRef(position);
final String postKey = postRef.getKey();
viewHolder.bindToPost(model);
}
};
mAdapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
@Override
public void onItemRangeInserted(int positionStart, int itemCount) {
super.onItemRangeInserted(positionStart, itemCount);
int friendlyMessageCount = mAdapter.getItemCount();
int lastVisiblePosition =
mManager.findLastCompletelyVisibleItemPosition();
// If the recycler view is initially being loaded or the
// user is at the bottom of the list, scroll to the bottom
// of the list to show the newly added message.
if (lastVisiblePosition == -1 ||
(positionStart >= (friendlyMessageCount - 1) &&
lastVisiblePosition == (positionStart - 1))) {
recyclerView.scrollToPosition(positionStart);
}
}
});
recyclerView.setAdapter(mAdapter);
}

PlaceHolder:

 public class PostViewHolder extends RecyclerView.ViewHolder {
public TextView title, emailt;
public PostViewHolder(View view) {
super(view);
title = (TextView) view.findViewById(R.id.title);
emailt = (TextView) view.findViewById(R.id.count);
}
public void bindToPost(User post, View.OnClickListener starClickListener) {
title.setText(post.username);
emailt.setText(post.email + "Likes");
}
public void bindToPost(User post) {
title.setText(post.username);
emailt.setText(post.email + "Likes");
}
}

Answer 1

El problema es que RecyclerView tiene una altura de WrapContent, por lo tanto, asegúrese de que la altura de su reciclador esté configurada en Match_Parent. Esto solucionará este problema.

<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
/>