RecyclerView实现查看更多及收起

概述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

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

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<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);  }

设置监听

luckyCodeAdapter.setHIDeOrShowCallBack(new LuckyCodeAdapter.HIDeOrShowCallBack() {   @OverrIDe   public voID hIDe() {    luckyCodeAdapter.setHIDeList(luckyCodeHIDeList);   }   @OverrIDe   public voID open() {    luckyCodeAdapter.setopenList(luckyCodeOpenList);   }  });

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程小技巧。

总结

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