Expandable Recyclerview in android

Expandable Recyclerview Adpter Code 

public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> {
    private List<Model> heroList;
    private Context context;
    private static int currentPosition;

    public Adapter(List<Model> heroList, Context context) {
        this.heroList = heroList;
        this.context = context;
        currentPosition=heroList.size();
    }

    @NonNull
    @Override
    public Adapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.job_find_layout, parent, false);
        return new ViewHolder(v);
    }

    @Override
    public void onBindViewHolder(@NonNull Adapter.ViewHolder holder, @SuppressLint("RecyclerView") int position) {
        Model hero = heroList.get(position);
        holder.profile.setText(hero.getProfile());
        holder.profile_name.setText(hero.getProfile_name());
        holder.Experience.setText(hero.getExperience());
        holder.Experience_year.setText(hero.getExperience_year());
        holder.profile2.setText(hero.getProfile2());
        holder.textViewEx.setText(hero.getTextViewEx());
        holder.Year_of_Experience2.setText(hero.getYear_of_Experience2().trim());


        
        holder.responsibilitiesDetails.setText(hero.getResponsibilitiesDetails());
        holder.KeySkill.setText(hero.getKeySkill());
        holder.KeySkillDetails.setText(hero.getKeySkillDetails().trim());

        holder.linear_layout2.setVisibility(View.GONE);
        if (currentPosition == position) {
            //creating an animation
            Animation slideDown = AnimationUtils.loadAnimation(context, R.anim.anim);

            //toggling visibility
            holder.linear_layout2.setVisibility(View.VISIBLE);
            // holder.linear_layout2.setVisibility(View.GONE);

            //adding sliding effect
            holder.linear_layout2.startAnimation(slideDown);
        }
        holder.linear_layout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                holder.linear_layout2.setVisibility(View.VISIBLE);

                //getting the position of the item to expand it
                if(currentPosition==position){
                    holder.linear_layout2.setVisibility(View.GONE);
                }else {
                    currentPosition = position;
                    //holder.linear_layout2.setVisibility(View.GONE);
                }
                //reloding the list
                notifyDataSetChanged();
            }
        });


    }

    @Override
    public int getItemCount() {
        return heroList.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        TextView profile, profile_name, Experience, Experience_year,
             
        CardView linear_layout;
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            profile = itemView.findViewById(R.id.profile);
            profile_name = itemView.findViewById(R.id.profile_name);
            Experience = itemView.findViewById(R.id.Experience);
            Experience_year = itemView.findViewById(R.id.Experience_year);
            profile2 = itemView.findViewById(R.id.profile2);
            textViewEx = itemView.findViewById(R.id.textViewEx);
            Year_of_Experience2 = itemView.findViewById(R.id.Year_of_Experience2);
            linear_layout = itemView.findViewById(R.id.linear_layout);
            linear_layout2 = itemView.findViewById(R.id.linear_layout2);


           
        }
    }
}