Using FirebaseUI for firebase recyclerView in android - firebase

Question

i am a new comer in android development and facing some problems using firebase ui.
i wanted to retrieve data from my firebase database and show it on my recyclerView.
but i am constantly getting an error while making FirebaseRecyclerAdapter.
Here is My Code Sample:
public class UsersActivity extends AppCompatActivity {
private Toolbar userToolbar;
private RecyclerView usersList;
private DatabaseReference mUsersDatabase;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_users);
userToolbar = (Toolbar) findViewById(R.id.users_toolbar);
setSupportActionBar(userToolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setTitle("Users");
mUsersDatabase = FirebaseDatabase.getInstance().getReference().child("Users");
usersList = (RecyclerView) findViewById(R.id.users_list);
usersList.setHasFixedSize(true);
usersList.setLayoutManager(new LinearLayoutManager(this));
}
#Override
protected void onStart() {
super.onStart();
FirebaseRecyclerAdapter<Users, UsersViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Users, UsersViewHolder>(
Users.class,
R.layout.single_user_list_layout,
UsersViewHolder.class,
mUsersDatabase
) {
#Override
protected void onBindViewHolder(#NonNull UsersViewHolder holder, int position, #NonNull Users model) {
holder.setName(model.getName());
}
#NonNull
#Override
public UsersViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
return null;
}
};
usersList.setAdapter(firebaseRecyclerAdapter);
}
public static class UsersViewHolder extends RecyclerView.ViewHolder
{
View mView;
public UsersViewHolder(#NonNull View itemView) {
super(itemView);
mView = itemView;
}
public void setName(String name)
{
TextView userNameView = (TextView) mView.findViewById(R.id.single_user_name);
userNameView.setText(name);
}
}
}
The Error i'm getting is this:
please help!!

Answer 1

Sorry wanted to comment but i ain't got enough points to do so.
Try this first, if it doesnt work try using FirebaseRecyclerOptions
(The latest version (3.x) of FirebaseUI implements a different method ofinitializing a FirebaseRecyclerAdapter than previous versions.)
Make your " firebaseRecyclerAdapter " variable global, so you would have something like this.
firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Users, UsersViewHolder>(
Users.class,
R.layout.single_user_list_layout,
UsersViewHolder.class,
mUsersDatabase
)