RecyclerView实现查看更多及收起
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
这里写图片描述
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。
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原始发表：2020-09-11
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