Android recycleView displaying an emply list - android-recyclerview

Question

Please i need help on this one. Have been working on it for days but cant figure it out.
I have a recycleView to display a list of names but its displaying empty list, but i can print the list in console.
here,s the code fetching the list
public List<BackendlessUser> userList = new ArrayList<BackendlessUser>();
BackendlessDataQuery query = new BackendlessDataQuery();
Backendless.Data.of( BackendlessUser.class ).find( query, new AsyncCallback<BackendlessCollection<BackendlessUser>>()
{
#Override
public void handleResponse( BackendlessCollection<BackendlessUser> response )
{
userList = response.getCurrentPage();
for( BackendlessUser user : userList ){
Log.d( "USERS : ", user.getEmail() );
}
Log.d("USER LIST", String.valueOf( userList.size() ));
}
#Override
public void handleFault(BackendlessFault backendlessFault) {
}
});
and the recyclerView adapter that is supposed to adapt the list to the view ..
private void setupRecyclerView(#NonNull RecyclerView recyclerView) {
recyclerView.setAdapter(new SimpleItemRecyclerViewAdapter(userList));
}
public class SimpleItemRecyclerViewAdapter
extends RecyclerView.Adapter<SimpleItemRecyclerViewAdapter.ViewHolder> {
private final List<BackendlessUser> mValues;
public SimpleItemRecyclerViewAdapter(List<BackendlessUser> items) {
mValues = items;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.item_list_content, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(final ViewHolder holder, int position) {
holder.mItem = mValues.get(position);
holder.mIdView.setText(mValues.get(position).getProperty("idno").toString());
holder.mContentView.setText(mValues.get(position).getProperty("fname").toString());
holder.mView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (mTwoPane) {
Bundle arguments = new Bundle();
arguments.putString(ItemDetailFragment.ARG_ITEM_ID, holder.mItem.getProperty("idno").toString());
ItemDetailFragment fragment = new ItemDetailFragment();
fragment.setArguments(arguments);
getSupportFragmentManager().beginTransaction()
.replace(R.id.item_detail_container, fragment)
.commit();
} else {
Context context = v.getContext();
Intent intent = new Intent(context, ItemDetailActivity.class);
intent.putExtra(ItemDetailFragment.ARG_ITEM_ID, holder.mItem.getProperty("idno").toString());
context.startActivity(intent);
}
}
});
}
#Override
public int getItemCount() {
return mValues.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public final View mView;
public final TextView mIdView;
public final TextView mContentView;
public BackendlessUser mItem;
public ViewHolder(View view) {
super(view);
mView = view;
mIdView = (TextView) view.findViewById(R.id.id);
mContentView = (TextView) view.findViewById(R.id.content);
}
#Override
public String toString() {
return super.toString() + " '" + mContentView.getText() + "'";
}
}
}