RecyclerView实现查看更多及收起

public class LuckyCodeAdapter extends RecyclerView.Adapter<LuckyCodeAdapter.LuckyCodeViewHolder> { private Context context; private List<String> 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<String> newList) {  this.list = newList;  notifyDataSetChanged();  this.isHide = true;  this.isOpen = false; } //展开 public void setOpenList(List<String> openList) {  this.list = openList;  this.isOpen = true;  this.isHide = false;  notifyDataSetChanged(); } //不需要隐藏/展开 public void setRealList(List<String> 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(); }}

//luckyList为真实list，判断是否需要隐藏 if (luckyList.size() > 4) {   luckyCodeHideList = new ArrayList<>();   luckyCodeOpenList = new ArrayList<>();   for (int i = 0; i < luckyList.size(); i++) {    luckyCodeOpenList.add(luckyList.get(i));   }   luckyCodeOpenList.add("收起");   for (int i = 0; i < 3; i++) {    luckyCodeHideList.add(luckyList.get(i));   }   luckyCodeHideList.add("查看更多");   luckyCodeAdapter.setHideList(luckyCodeHideList);  } else {   luckyCodeAdapter.setRealList(luckyList);  }

luckyCodeAdapter.setHideOrShowCallBack(new LuckyCodeAdapter.HideOrShowCallBack() {   @Override   public void hide() {    luckyCodeAdapter.setHideList(luckyCodeHideList);   }   @Override   public void open() {    luckyCodeAdapter.setOpenList(luckyCodeOpenList);   }  });