How to Create Dynamic Horizontal RecyclerView in Android using Firebase Firestore?

public class DataModal {

    // variables for storing our image and name.
    private String name;
    private String imgUrl;

    public DataModal() {
        // empty constructor required for firebase.
    }

    // constructor for our object class.
    public DataModal(String name, String imgUrl) {
        this.name = name;
        this.imgUrl = imgUrl;
    }

    // getter and setter methods
    public String getName() {
        return name;
    }

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

    public String getImgUrl() {
        return imgUrl;
    }

    public void setImgUrl(String imgUrl) {
        this.imgUrl = imgUrl;
    }
}

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.squareup.picasso.Picasso;

import java.util.ArrayList;

public class DataRVAdapter extends RecyclerView.Adapter<DataRVAdapter.ViewHolder> {
    private ArrayList<DataModal> dataModalArrayList;
    private Context context;

    // constructor class for our Adapter
    public DataRVAdapter(ArrayList<DataModal> dataModalArrayList, Context context) {
        this.dataModalArrayList = dataModalArrayList;
        this.context = context;
    }

    @NonNull
    @Override
    public DataRVAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        // passing our layout file for displaying our card item
        return new DataRVAdapter.ViewHolder(LayoutInflater.from(context).inflate(R.layout.image_rv_item, parent, false));
    }

    @Override
    public void onBindViewHolder(@NonNull DataRVAdapter.ViewHolder holder, int position) {
        // setting data to our views in Recycler view items.
        DataModal modal = dataModalArrayList.get(position);
        holder.courseNameTV.setText(modal.getName());
        
        // we are using Picasso to load images
        // from URL inside our image view.
        Picasso.get().load(modal.getImgUrl()).into(holder.courseIV);
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // setting on click listener
                // for our items of recycler items.
                Toast.makeText(context, "Clicked item is " + modal.getName(), Toast.LENGTH_SHORT).show();
            }
        });
    }

    @Override
    public int getItemCount() {
        // returning the size of array list.
        return dataModalArrayList.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        // creating variables for our 
        // views of recycler items.
        private TextView courseNameTV;
        private ImageView courseIV;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            // initializing the views of recycler views.
            courseNameTV = itemView.findViewById(R.id.idTVtext);
            courseIV = itemView.findViewById(R.id.idIVimage);
        }
    }
}

import android.os.Bundle;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.firestore.DocumentSnapshot;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.QuerySnapshot;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private RecyclerView courseRV;
    private ArrayList<DataModal> dataModalArrayList;
    private DataRVAdapter dataRVAdapter;
    private FirebaseFirestore db;

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

        // initializing our variables.
        courseRV = findViewById(R.id.idRVItems);

        // initializing our variable for firebase
        // firestore and getting its instance.
        db = FirebaseFirestore.getInstance();

        // creating our new array list
        dataModalArrayList = new ArrayList<>();
        courseRV.setHasFixedSize(true);

        // adding horizontal layout manager for our recycler
        // view.
        courseRV.setLayoutManager(new LinearLayoutManager(
            this, LinearLayoutManager.HORIZONTAL, false));

        // adding our array list to our recycler view
        // adapter class.
        dataRVAdapter
            = new DataRVAdapter(dataModalArrayList, this);

        // setting adapter to our recycler view.
        courseRV.setAdapter(dataRVAdapter);

        loadrecyclerViewData();
    }

    private void loadrecyclerViewData()
    {

        db.collection("Data")
            .get()
            .addOnSuccessListener(new OnSuccessListener<
                                  QuerySnapshot>() {
                @Override
                public void onSuccess(
                    QuerySnapshot queryDocumentSnapshots)
                {
                    // after getting the data we are calling
                    // on success method and inside this
                    // method we are checking if the
                    // received query snapshot is empty or
                    // not.
                    if (!queryDocumentSnapshots.isEmpty()) {
                        // if the snapshot is not empty we
                        // are hiding our progress bar and
                        // adding our data in a list.
                        List<DocumentSnapshot> list
                            = queryDocumentSnapshots
                                  .getDocuments();
                        for (DocumentSnapshot d : list) {
                            // after getting this list we
                            // are passing that list to our
                            // object class.
                            DataModal dataModal
                                = d.toObject(
                                    DataModal.class);

                            // and we will pass this object
                            // class inside our arraylist
                            // which we have created for
                            // recycler view.
                            dataModalArrayList.add(
                                dataModal);
                        }
                        // after adding the data to recycler
                        // view. we are calling recycler
                        // view notifyDataSetChanged method
                        // to notify that data has been
                        // changed in recycler view.
                        dataRVAdapter
                            .notifyDataSetChanged();
                    }
                    else {
                        // if the snapshot is empty we are
                        // displaying a toast message.
                        Toast
                            .makeText(
                                MainActivity.this,
                                "No data found in Database",
                                Toast.LENGTH_SHORT)
                            .show();
                    }
                }
            })
            .addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception e)
                {
                    // if we do not get any data or any
                    // error we are displaying a toast
                    // message that we do not get any data
                    Toast
                        .makeText(MainActivity.this,
                                  "Fail to get the data.",
                                  Toast.LENGTH_SHORT)
                        .show();
                }
            });
    }
}