Adapter.java

@Override
public void onBindViewHolder(RecViewHolder holder, int position) {
    Movie movie = list.get(position);
    // Set movie data
    holder.bind(movie);

    holder.itemView.setOnClickListener(v -> {
        // Get the current state of the item
        boolean expanded = movie.isExpanded();
        // Change the state
        movie.setExpanded(!expanded);
        // Notify the adapter that item has changed
        notifyItemChanged(position);
    });
}

// Method in ViewHolder class
private void bind(Movie movie) {
    // Get the state
    boolean expanded = movie.isExpanded();
    // Set the visibility based on state
    subItem.setVisibility(expanded ? View.VISIBLE : View.GONE);

    title.setText(movie.getTitle());
    genre.setText("Genre: " + movie.getGenre());
    year.setText("Year: " + movie.getYear());
}