populating firebase recyclerview

Question

I am working on a Firebase project where i want to show the list of all the user from my database in a recyclerView, i am using firebase ui to populate the recyclerview but it shows nothing. right now i am just want to show the name of the user.

sorry for bad english.

Here is my database image from where i want to get data. DataBase Image

Here in onStart method i am populating the recylerView.

RecyclerView Activity

    package com.inabdev.lapitchat;

    import android.os.Bundle;
    import android.support.annotation.NonNull;
    import android.support.v7.app.AppCompatActivity;
    import android.support.v7.widget.LinearLayoutManager;
    import android.support.v7.widget.RecyclerView;
    import android.support.v7.widget.Toolbar;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.TextView;
    import android.widget.Toast;
    import com.firebase.ui.database.FirebaseRecyclerAdapter;
    import com.firebase.ui.database.FirebaseRecyclerOptions;
    import com.google.firebase.database.DatabaseReference;
    import com.google.firebase.database.FirebaseDatabase;
    import com.google.firebase.database.Query;

    public class AllUsersActivity extends AppCompatActivity {

    private Toolbar allUsers_toolbar;
    private RecyclerView allUsersList;

    private DatabaseReference mAllUsersDatabases;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_all_users);

        allUsers_toolbar = (Toolbar) findViewById(R.id.all_users_appbar);
        setSupportActionBar(allUsers_toolbar);
        getSupportActionBar().setTitle("All Users");
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        mAllUsersDatabases = FirebaseDatabase.getInstance().getReference().child("users");

        allUsersList = (RecyclerView) findViewById(R.id.users_list);
        allUsersList.setHasFixedSize(true);
        allUsersList.setLayoutManager(new LinearLayoutManager(AllUsersActivity.this));
    }

    @Override
    protected void onStart() {
        super.onStart();

        Query query = FirebaseDatabase.getInstance().getReference().child("users");

        FirebaseRecyclerOptions<AllUsersModel> options = new FirebaseRecyclerOptions.Builder<AllUsersModel>()
                .setQuery(query, AllUsersModel.class)
                .build();

        FirebaseRecyclerAdapter<AllUsersModel, AllUserViewHolder> adapter = new FirebaseRecyclerAdapter<AllUsersModel, AllUserViewHolder>(options) {

            @Override
            protected void onBindViewHolder(@NonNull AllUserViewHolder holder, int position, @NonNull AllUsersModel model) {

                holder.setName(model.getName());
                Toast.makeText(AllUsersActivity.this, "Name is : " + model.getName(),Toast.LENGTH_SHORT).show();
            }
            @NonNull
            @Override
            public AllUserViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {

                View view = LayoutInflater.from(viewGroup.getContext())
                        .inflate(R.layout.single_user_ui, viewGroup, false);

                return new AllUserViewHolder(view);
            }
        };

        adapter.startListening();
        allUsersList.setAdapter(adapter);
    }
}

    class AllUserViewHolder extends RecyclerView.ViewHolder {
    View mView;

    public AllUserViewHolder(@NonNull View itemView) {
        super(itemView);

        mView = itemView;
    }

    public void setName(String name) {

        TextView mUsername = (TextView) mView.findViewById(R.id.single_userName);
        mUsername.setText(name);
    }
}

Model Class

package com.inabdev.lapitchat;
public class AllUsersModel {

    private String image;
    private String name;
    private String status;
    private String thumb_image;

    public AllUsersModel() {
    }

    public AllUsersModel(String image, String name, String status) {
        this.name = name;
        this.status = status;
        this.image = image;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public String getImage() {
        return image;
    }

    public void setImage(String image) {
        this.image = image;
    }

    public String getThumb_image() {
        return thumb_image;
    }

    public void setThumb_image(String thumb_image) {
        this.thumb_image = thumb_image;
    }
}