本文实例为大家分享了RecyclerView实现查看更多及收起的具体代码，供大家参考，具体内容如下

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三个list：

realList 真实list
hideList 隐藏时的list
openList 展开时的list

做法就是

判断适配器条目小于4（可任意）时，将适配器list设置为真实list
判断适配器条目大于4（可任意）时，将适配器hideList设置为真实list的前三个条目+查看更多；将适配器openList设置为真实list+收起

适配器代码

public class LuckyCodeAdapter extends RecyclerView.Adapter {
 private Context context;
 private List list;
 private boolean isHide;//隐藏
 private boolean isOpen;//展开

 public LuckyCodeAdapter(Context context) {
  this.context = context;
 }

 @Override
 public LuckyCodeViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
  View v = LayoutInflater.from(context).inflate(R.layout.item_tosanpup_lucky_code, parent, false);
  return new LuckyCodeViewHolder(v);
 }

 @Override
 public void onBindViewHolder(LuckyCodeViewHolder holder, final int position) {
  holder.txtLuckyCode.setText(list.get(position));
  if (hideOrShowCallBack != null) {
   holder.txtLuckyCode.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
     if (position == list.size() - 1) {
      if (isOpen) {
       hideOrShowCallBack.hide();
       return;
      }
      if (isHide) {
       hideOrShowCallBack.open();
       return;
      }
     }
    }
   });

  }
 }

 @Override
 public int getItemCount() {
  return list == null ? 0 : list.size();
 }

 //隐藏
 public void setHideList(List newList) {
  this.list = newList;
  notifyDataSetChanged();
  this.isHide = true;
  this.isOpen = false;
 }

 //展开
 public void setOpenList(List openList) {
  this.list = openList;
  this.isOpen = true;
  this.isHide = false;
  notifyDataSetChanged();
 }

 //不需要隐藏/展开
 public void setRealList(List realList) {
  this.list = realList;
  notifyDataSetChanged();
  this.isHide = false;
  this.isOpen = false;
 }

 //清除数据
 public void clearData() {
  if (list != null) {
   this.list.clear();
   notifyDataSetChanged();
  }
 }

 class LuckyCodeViewHolder extends RecyclerView.ViewHolder {
  TextView txtLuckyCode;//幸运号码

  public LuckyCodeViewHolder(View itemView) {
   super(itemView);
   txtLuckyCode = (TextView) itemView;
  }
 }

 private HideOrShowCallBack hideOrShowCallBack;

 public void setHideOrShowCallBack(HideOrShowCallBack hideOrShowCallBack) {
  this.hideOrShowCallBack = hideOrShowCallBack;
 }

 public interface HideOrShowCallBack {
  void hide();

  void open();
 }
}

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