二级列表的简单使用

布局
<ExpandableListView
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="8"
    android:id="@+id/expan"
    ></ExpandableListView>

导入适配器

myada = new Mainmyada(data,getActivity());
expan.setAdapter(myada)

package com.example.gouwuchexiaoer.mainmvp.mainmyada;

适配器


 import android.annotation.SuppressLint;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;

import com.example.gouwuchexiaoer.R;
import com.example.gouwuchexiaoer.bean.ZhanShiShuJu;
import com.example.gouwuchexiaoer.okhttp.Okhttp;
import com.example.gouwuchexiaoer.util.mya;
import com.facebook.drawee.view.SimpleDraweeView;

import java.util.List;

/**
 *
 */

public class Mainmyada extends BaseExpandableListAdapter{
    List<ZhanShiShuJu.DataBean> data;Context context;
    private String url="";
    public Mainmyada(List<ZhanShiShuJu.DataBean> data, Context context) {
        this.data=data;
        this.context=context;
    }

    @Override
    public int getGroupCount() {
        return data.size();
    }

    @Override
    public int getChildrenCount(int i) {
        return data.get(i).getList().size();
    }

    @Override
    public Object getGroup(int i) {
        return data.get(i);
    }

    @Override
    public Object getChild(int i, int i1) {
        return data.get(i).getList().get(i1);
    }

    @Override
    public long getGroupId(int i) {
        return i;
    }

    @Override
    public long getChildId(int i, int i1) {
        return i1;
    }

    @Override
    public boolean hasStableIds() {
        return true;
    }

    @Override
    public View getGroupView(final int i, boolean b, View view, ViewGroup viewGroup) {
        GroupViewHolder groupViewHolder;
        //优化
        if(view==null){
            view=View.inflate (context, R.layout.layout,null);
            groupViewHolder=new GroupViewHolder ();
            groupViewHolder.gcheckBox = view.findViewById (R.id.group_box);
            groupViewHolder.gtextview=  view.findViewById (R.id.group_text);
            view.setTag (groupViewHolder);
        }else{
            groupViewHolder= (GroupViewHolder) view.getTag ();
        }
        groupViewHolder.gtextview.setText (data.get (i).getSellerName ());
//1
        int qq = 0;
        for (int j = 0; j < data.get(i).getList().size(); j++) {
            qq += data.get(i).getList().get(j).getSelected();
        }
        if (qq == data.get(i).getList().size()) {
            for (int j = 0; j < data.get(i).getList().size(); j++) {
                groupViewHolder.gcheckBox.setChecked(true);
                notifyDataSetChanged();
            }
        } else {
            for (int j = 0; j < data.get(i).getList().size(); j++) {
                groupViewHolder.gcheckBox.setChecked(false);
                notifyDataSetChanged();
            }
        }


        groupViewHolder.gcheckBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //2
                int qq = 0;
                for (int j = 0; j < data.get(i).getList().size(); j++) {
                    qq += data.get(i).getList().get(j).getSelected();
                }
                if (qq == data.get(i).getList().size()) {
                    for (int j = 0; j < data.get(i).getList().size(); j++) {
                        data.get(i).getList().get(j).setSelected(0);
                        notifyDataSetChanged();
                    }
                } else {
                    for (int j = 0; j < data.get(i).getList().size(); j++) {
                        data.get(i).getList().get(j).setSelected(1);
                        notifyDataSetChanged();
                    }
                }
            }

        });
        return view;
    }

    @SuppressLint("WrongViewCast")
    @Override
    public View getChildView(final int i, final int i1, boolean b, View view, ViewGroup viewGroup) {
        ChildViewHolder childViewHolder;
        //优化
        if(view==null){
            view=View.inflate (context,R.layout.layout2,null);
            childViewHolder=new ChildViewHolder ();
            childViewHolder.ccheckBox=view.findViewById (R.id.child_box);
            childViewHolder.ctextview=view.findViewById (R.id.child_text);
            childViewHolder.cprice=view.findViewById (R.id.child_price);
            childViewHolder.csimpleDraweeView=view.findViewById(R.id.child_image);
            childViewHolder.mya=view.findViewById(R.id.mya);
            view.setTag (childViewHolder);
        }else{
            childViewHolder= (ChildViewHolder) view.getTag ();
        }
        childViewHolder.ctextview.setText (data.get (i).getList ().get (i1).getTitle ());
        String images = data.get (i).getList ().get (i1).getImages ();
        String[] split = images.split ("\\|");
        childViewHolder.csimpleDraweeView.setImageURI (split[0]);
        childViewHolder.cprice.setText (data.get (i).getList ().get (i1).getPrice ()*data.get(i).getList().get(i1).getNum()+"");
        childViewHolder.mya.setv(data.get(i).getList().get(i1).getNum());
        childViewHolder.mya.setzhuan(new mya.Zhuan() {
            @Override
            public void zhuanshu(int shu01) {
                int selected = data.get(i).getList().get(i1).getSelected();
                int sellerid = data.get(i).getList().get(i1).getSellerid();
                int pid = data.get(i).getList().get(i1).getPid();
                Toast.makeText(context,shu01+"",Toast.LENGTH_SHORT).show();
                url="https://www.zhaoapi.cn/product/updateCarts?uid=10507&sellerid="+sellerid+"&pid="+pid+"&selected="+selected+"&num="+shu01;
                Okhttp okhttp = new Okhttp();
                okhttp.say(url, new Okhttp.fun1() {
                    @Override
                    public void onres(String string) {
                        Toast.makeText(context,string,Toast.LENGTH_SHORT).show();
                        notifyDataSetChanged();
                    }
                });
            }
        });
        if (data.get(i).getList().get(i1).getSelected()==0)
        {
            childViewHolder.ccheckBox.setChecked(false);
        }else
            {
                childViewHolder.ccheckBox.setChecked(true);
            }
        childViewHolder.ccheckBox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (data.get(i).getList().get(i1).getSelected()==0) {
                    data.get(i).getList().get(i1).setSelected(1);
                    Toast.makeText(context, data.get(i).getList().get(i1).getSelected() + "", Toast.LENGTH_SHORT).show();
                    notifyDataSetChanged();
                }else
                    {
                        data.get(i).getList().get(i1).setSelected(0);
                        Toast.makeText(context, data.get(i).getList().get(i1).getSelected() + "", Toast.LENGTH_SHORT).show();
                        notifyDataSetChanged();
                    }
            }
        });

        return view;
    }

    @Override
    public boolean isChildSelectable(int i, int i1) {
        return true;
    }
    //组的寄存器
    class GroupViewHolder{
        CheckBox gcheckBox;
        TextView gtextview;

    }
    //子条目的寄存器
    class ChildViewHolder{
        CheckBox ccheckBox;
        TextView ctextview,cprice;
        SimpleDraweeView csimpleDraweeView;
        mya mya;
    }
}