import net.cachapa.expandablelayout.ExpandableLayout; //导入依赖的package包/类
public PoemViewHolder(View view) {
  super(view);
  tv=(TextView) view.findViewById(R.id.item_tv);
  expandableLayout = (ExpandableLayout) itemView.findViewById(R.id.expandable_layout);
  expandText=(TextView)itemView.findViewById(R.id.expandable_text);
  expandableLayout.setInterpolator(new OvershootInterpolator());
  expandableLayout.setOnExpansionUpdateListener(this);

  tv.setOnClickListener(this);
}
 

import net.cachapa.expandablelayout.ExpandableLayout; //导入依赖的package包/类
@Override
public void onExpansionUpdate(float expansionFraction, int state) {
    Log.d("ExpandableLayout", "State: " + state);
    if (state == ExpandableLayout.State.EXPANDING) {
        recyclerView.smoothScrollToPosition(getAdapterPosition());
    }
}