UserAdapter.java

package com.studio.mattiaferigutti.itiproject;

import android.view.LayoutInflater;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.DiffUtil;
import androidx.recyclerview.widget.ListAdapter;
import androidx.recyclerview.widget.RecyclerView;
import com.studio.mattiaferigutti.itiproject.databinding.RowLayoutBinding;

public class UserAdapter extends ListAdapter<User, UserAdapter.ViewHolder> {

    private OnItemClickListener listener;

    public interface OnItemClickListener {
        void onItemSelected(User user);
    }

    public UserAdapter(OnItemClickListener listener) {
        super(new UserDiffCallback());
        this.listener = listener;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        return ViewHolder.from(parent);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        User item = getItem(position);
        holder.itemView.setOnClickListener(v -> {
            listener.onItemSelected(item);
        });
        holder.bind(item);
    }

    static class ViewHolder extends RecyclerView.ViewHolder {
        private final RowLayoutBinding binding;

        public ViewHolder(@NonNull RowLayoutBinding binding) {
            super(binding.getRoot());
            this.binding = binding;
        }

        public void bind(User item) {
            binding.setUser(item);
            binding.executePendingBindings();
        }

        public static ViewHolder from(ViewGroup parent) {
            LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
            RowLayoutBinding binding = RowLayoutBinding.inflate(layoutInflater, parent, false);

            return new ViewHolder(binding);
        }
    }
}

class UserDiffCallback extends DiffUtil.ItemCallback<User> {
    @Override
    public boolean areItemsTheSame(@NonNull User oldItem, @NonNull User newItem) {
        return oldItem.equals(newItem);
    }

    @Override
    public boolean areContentsTheSame(@NonNull User oldItem, @NonNull User newItem) {
        return (oldItem.getFirstName().equals(newItem.getFirstName())) &&
                (oldItem.getLastName().equals(newItem.getLastName())) &&
                (oldItem.getEmail().equals(newItem.getEmail()));
    }
}