@Override
public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
super.onBindViewHolder(viewHolder, position);
ClassItemViewHolder holder = (ClassItemViewHolder) viewHolder;
ClassModel book = list.get(position);
if (book == null) return;
holder.setTitleText(book.getTitle());
holder.setAuthorText(book.getAuthor());
holder.setPicImage(book.getPic());
animate(viewHolder, position);
}
