二级列表（适配器）

public class ShoppingCartAdapter extends BaseExpandableListAdapter {
private Context mContext;
private ShoppingCartBean mShoppingCartBean;
public ShoppingCartAdapter(Context context){
this.mContext = context;
}

public void setData(ShoppingCartBean shoppingCartBean){
    this.mShoppingCartBean = shoppingCartBean;
}

@Override
public int getGroupCount() {
    if(mShoppingCartBean == null){
        return 0;
    }
    return mShoppingCartBean.getData().size();
}

@Override
public int getChildrenCount(int groupPosition) {
    if(mShoppingCartBean == null){
        return 0;
    }
    return mShoppingCartBean.getData().get(groupPosition).getList().size();
}

@Override
public Object getGroup(int groupPosition) {
    return null;
}

@Override
public Object getChild(int groupPosition, int childPosition) {
    return null;
}

@Override
public long getGroupId(int groupPosition) {
    return 0;
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    return 0;
}

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

@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
    ParentViewHolder parentViewHolder;
    if(convertView == null) {
        convertView = LayoutInflater.from(mContext).inflate(R.layout.item_group, null);
        parentViewHolder = new ParentViewHolder();
        parentViewHolder.shopName = convertView.findViewById(R.id.shopName);
        parentViewHolder.checkBox = convertView.findViewById(R.id.checkbox_parent);
        convertView.setTag(parentViewHolder);
    } else {
        parentViewHolder = (ParentViewHolder) convertView.getTag();
    }

    parentViewHolder.checkBox.setChecked(mShoppingCartBean.getData().get(groupPosition).isCheck());
    parentViewHolder.shopName.setText(mShoppingCartBean.getData().get(groupPosition).getSellerName());
    parentViewHolder.checkBox.setTag(groupPosition);
    parentViewHolder.checkBox.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            CheckBox checkBox = (CheckBox) v;
            boolean checked = checkBox.isChecked();
            int groupPosition = Integer.parseInt(checkBox.getTag().toString());
            mShoppingCartBean.getData().get(groupPosition).setCheck(checked);
            selectGroup(groupPosition,checked);
            boolean selectAllGroup = isSelectAllGroup();
            mCheckBox.setChecked(selectAllGroup);
            notifyDataSetChanged();
        }
    });
    return convertView;
}

@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
    ChildViewHolder childViewHolder;
    if(convertView == null) {
        convertView = LayoutInflater.from(mContext).inflate(R.layout.item_child, null);
        childViewHolder = new ChildViewHolder();
        childViewHolder.goodsName = convertView.findViewById(R.id.goodsName);
        childViewHolder.checkBox = convertView.findViewById(R.id.checkbox_child);
        convertView.setTag(childViewHolder);
    } else {
        childViewHolder = (ChildViewHolder) convertView.getTag();
    }
    childViewHolder.checkBox.setChecked(mShoppingCartBean.getData().get(groupPosition).getList().get(childPosition).isCheck());
    childViewHolder.goodsName.setText(mShoppingCartBean.getData().get(groupPosition).getList().get(childPosition).getTitle());
    childViewHolder.checkBox.setTag(groupPosition+"#"+childPosition);

    childViewHolder.checkBox.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            CheckBox checkBox = (CheckBox) v;
            String tag = (String) v.getTag();
            int groupPosition = Integer.parseInt(tag.split("#")[0]);
            int childPosition = Integer.parseInt(tag.split("#")[1]);
            ShoppingCartBean.DataBean dataBean = mShoppingCartBean.getData().get(groupPosition);
            ShoppingCartBean.DataBean.ListBean goodsBean = dataBean.getList().get(childPosition);
            goodsBean.setCheck(checkBox.isChecked());
            boolean selectGroup = isSelectGroup(groupPosition);
            dataBean.setCheck(selectGroup);
            boolean selectAllGroup = isSelectAllGroup();
            mCheckBox.setChecked(selectAllGroup);
            notifyDataSetChanged();
        }
    });
    return convertView;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
    return false;
}

CheckBox mCheckBox;
public void setCheckBox(final CheckBox checkBox) {
    this.mCheckBox = checkBox;
    mCheckBox.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            CheckBox checkBox = (CheckBox) v;
            selectAll(checkBox.isChecked());
        }
    });
}

public void selectGroup(int groupPosition,boolean isChecked){
    for (int i = 0; i < mShoppingCartBean.getData().get(groupPosition).getList().size(); i++) {
        ShoppingCartBean.DataBean.ListBean listBean = mShoppingCartBean.getData().get(groupPosition).getList().get(i);
        listBean.setCheck(isChecked);
    }

}

private void selectAll(boolean checked) {
    for (int i = 0; i < mShoppingCartBean.getData().size(); i++) {
        ShoppingCartBean.DataBean dataBean = mShoppingCartBean.getData().get(i);
        dataBean.setCheck(checked);
        for (int j = 0; j < dataBean.getList().size(); j++) {
            ShoppingCartBean.DataBean.ListBean listBean = dataBean.getList().get(j);
            listBean.setCheck(checked);
        }
    }
    notifyDataSetChanged();
}

private boolean isSelectGroup(int groupPosition){
    for (int i = 0; i < mShoppingCartBean.getData().get(groupPosition).getList().size(); i++) {
        ShoppingCartBean.DataBean.ListBean listBean = mShoppingCartBean.getData().get(groupPosition).getList().get(i);
        boolean check = listBean.isCheck();
        if (!check){
            return false;
        }
    }
    return true;
}

private boolean isSelectAllGroup(){
    for (int i = 0; i < mShoppingCartBean.getData().size(); i++) {
        ShoppingCartBean.DataBean dataBean = mShoppingCartBean.getData().get(i);
        boolean check = dataBean.isCheck();
        if (!check) {
            return false;
        }
    }
    return true;
}



class ParentViewHolder {
    TextView shopName;
    CheckBox checkBox;
}

class ChildViewHolder {
    TextView goodsName;
    CheckBox checkBox;
}

}