简易购物车

自学记录：无详解

BasePresenter：

public class BasePresenter<T extends IBaseView> {

    private T t;

    public void attachView(T t){
        this.t=t;
    }

    public T getView(){
        return t;
    }

    public void detachView(){
        t=null;
    }
}

CartPresenter：

public class CartPresenter extends BasePresenter<ICartView>{

    private NetUtil netUtil;

    public CartPresenter() {
        netUtil = NetUtil.getInstance();
    }

    public void getDataFromServer(String path) {
        netUtil.doGet(path, new HttpUtilsCallback() {
            @Override
            public void onSuccess(String success) {
                getView().onSuccess(success);
            }
            @Override
            public void onFail(int errCode, String errMsg) {

            }
        });
    }
}

CalcUtils:

/**
 * 功能描述： 用于对数值的精确计算工具类
 * author:Created by WangZhiQiang on 2018/5/18.
 */
public class CalcUtils {

    public static final int TYPE_ADD = 0x00; // 加法
    public static final int TYPE_MULTIPLY = 0x01; // 乘法
    public static final int TYPE_DIVIDE = 0x02; // 除法
    public static final int TYPE_SUBTRACT = 0x03; // 减法
    /**
     *  加法
     * @param a
     * @param b
     * @return
     */
    public static Double add(Double a, Double b) {
        return calc(a, b, -1, TYPE_ADD, null);
    }
    /**
     * 减法
     * @param a
     * @param b
     * @return
     */

    public static Double sub(Double a, Double b) {
        return calc(a, b, -1, TYPE_SUBTRACT, null);
    }
    /**
     * 乘法
     * @param a
     * @param b
     * @return
     */

    public static Double multiply(Double a, Double b) {
        return calc(a, b, -1, TYPE_MULTIPLY, null);
    }

    /**
     * 除法
     * @param a
     * @param b
     * @return
     */

    public static Double divide(Double a, Double b) {
        return calc(a, b, -1, TYPE_DIVIDE, null);
    }
    /**
     * Scale
     *      是用来对利用BigDecimal对数值进行运算后保留的位数。
     *
     * RouningMode
     *  该参数是BigDecimal是一个枚举类，包含有8个枚举类型，用来说明对经过计算后数值的取舍模式。
     *
     *      ROUND_UP：远离零方向舍入。向绝对值最大的方向舍入，只要舍弃位非0即进位。
     *      ROUND_DOWN：趋向零方向舍入。向绝对值最小的方向输入，所有的位都要舍弃，不存在进位情况。
     *      ROUND_CEILING：向正无穷方向舍入。向正最大方向靠拢。若是正数，舍入行为类似于ROUND_UP，若为负数，舍入行为类似于ROUND_DOWN。Math.round()方法就是使用的此模式。
     *      ROUND_FLOOR：向负无穷方向舍入。向负无穷方向靠拢。若是正数，舍入行为类似于ROUND_DOWN；若为负数，舍入行为类似于ROUND_UP。
     *      HALF_UP：最近数字舍入(5进)。这是我们最经典的四舍五入。
     *      HALF_DOWN：最近数字舍入(5舍)。在这里5是要舍弃的。
     *      HAIL_EVEN：银行家舍入法。
     */

    /**
     * 乘法
     * @param a
     * @param b
     * @param scale 小数点后保留的位数
     * @param mode 保留的模式
     * @return
     */
    public static Double multiply(Double a, Double b, int scale, RoundingMode mode) {

        return calc(a, b, scale, TYPE_MULTIPLY, mode);
    }
    /**
     * 除法
     * @param a
     * @param b
     * @param scale 小数点后保留的位数
     * @param mode 保留的模式
     * @return
     */
    public static Double divide(Double a, Double b, int scale, RoundingMode mode) {

        return calc(a, b, scale, TYPE_DIVIDE, mode);
    }
    /**
     *  计算
     * @param a
     * @param b
     * @param scale
     * @param type
     * @param mode
     * @return
     */
    private static Double calc(Double a, Double b, int scale, int type, RoundingMode mode) {
        BigDecimal result = null;

        BigDecimal bgA = new BigDecimal(String.valueOf(a));
        BigDecimal bgB = new BigDecimal(String.valueOf(b));
        switch (type) {
            case TYPE_ADD:
                result = bgA.add(bgB);
                break;
            case TYPE_MULTIPLY:
                result = bgA.multiply(bgB);
                break;
            case TYPE_DIVIDE:
                try {
                    result = bgA.divide(bgB);
                } catch (ArithmeticException e) {// 防止无限循环而报错  采用四舍五入保留3位有效数字
                    result = bgA.divide(bgB,3,RoundingMode.HALF_DOWN);
                }

                break;
            case TYPE_SUBTRACT:
                result = bgA.subtract(bgB);
                break;

        }
        if (mode==null) {
            if(scale!=-1){

                result = result.setScale(scale);
            }
        }else{
            if(scale!=-1){
                result = result.setScale(scale,mode);
            }
        }
        return result.doubleValue();
    }
}

FrescoUtil:

/**
 * Fresco加载图片工具类
 * author:Created by WangZhiQiang on 2018/5/10.
 */
public class FrescoUtil {
    /**
     * 基础加载图片
     * @param url 图片路径
     * @param simpleDraweeView 控件
     */
    public static void setTu(String url,SimpleDraweeView simpleDraweeView){
        Uri uri = Uri.parse(url);
        simpleDraweeView.setImageURI(uri);
    }
    /**
     * 渐进式加载图片
     * @param url 图片路径
     * @param simpleDraweeView 控件
     */
    public static void setJianJin(String url, SimpleDraweeView simpleDraweeView){
        Uri uri = Uri.parse(url);
        ImageRequest request = ImageRequestBuilder.newBuilderWithSource(uri)
                .setProgressiveRenderingEnabled(true)
                .build();
        DraweeController controller = Fresco.newDraweeControllerBuilder()
                .setImageRequest(request)
                .setOldController(simpleDraweeView.getController())
                .build();
        simpleDraweeView.setController(controller);
    }
    /**
     * 圆角图片
     * @param url 图片路径
     * @param simpleDraweeView 控件
     * @param radius 角度
     * @param color 描边线颜色
     * @param width  描边线宽度
     */
    public static void setYuanJiao(String url,SimpleDraweeView simpleDraweeView,float radius,int color,float width){
        Uri uri = Uri.parse(url);
        RoundingParams roundingParams = RoundingParams.fromCornersRadius(0f);
        if (width > 0f) {
            roundingParams.setBorder(color, width);//描边线
        }
        roundingParams.setCornersRadius(radius);//总体圆角
        simpleDraweeView.getHierarchy().setRoundingParams(roundingParams);
        simpleDraweeView.setImageURI(uri);
    }

    /**
     * 圆角图片
     * 可控四角角度
     * @param url 图片路径
     * @param simpleDraweeView 控件
     * @param topLeft 左上角
     * @param topRight 右上角
     * @param bottomRight 右下角
     * @param bottomLeft 左下角
     * @param color 描边线颜色
     * @param width 描边线宽度
     */
    public static void setYuanJiao(String url,SimpleDraweeView simpleDraweeView,float topLeft, float topRight, float bottomRight, float bottomLeft,int color,float width){
        Uri uri = Uri.parse(url);
        RoundingParams roundingParams = RoundingParams.fromCornersRadius(0f);
        if (width > 0f) {
            roundingParams.setBorder(color, width);//描边线
        }
        roundingParams.setCornersRadii(topLeft,topRight,bottomRight,bottomLeft);//各角不同圆角
        simpleDraweeView.getHierarchy().setRoundingParams(roundingParams);
        simpleDraweeView.setImageURI(uri);
    }

    /**
     * 圆形图片
     * @param url 图片路径
     * @param simpleDraweeView 控件
     * @param color 描边线颜色
     * @param width 描边线宽度
     */
    public static void setYuanQuan(String url,SimpleDraweeView simpleDraweeView,int color,float width){
        Uri uri = Uri.parse(url);
        RoundingParams roundingParams = RoundingParams.fromCornersRadius(0f);
        if (width > 0f) {
            roundingParams.setBorder(color, width);//描边线
        }
        roundingParams.setRoundAsCircle(true);//圆形
        simpleDraweeView.getHierarchy().setRoundingParams(roundingParams);
        simpleDraweeView.setImageURI(uri);
    }

    /**
     * Gif动态图片
     * @param url 图片路径
     * @param simpleDraweeView 控件
     */
    public static void setDongTu(String url,SimpleDraweeView simpleDraweeView){
        Uri uri = Uri.parse(url);
        DraweeController controller1 = Fresco.newDraweeControllerBuilder()
                .setUri(uri)
                .setTapToRetryEnabled(true)
                .setAutoPlayAnimations(true)//设置为true将循环播放Gif动画
                .setOldController(simpleDraweeView.getController())
                .build();
        simpleDraweeView.setController(controller1);
    }
}

BaseFragment：

public abstract class BaseFragment<P extends BasePresenter> extends Fragment implements IBaseView {
    private P p;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(setChildContentView(), container, false);
        initView(view);
        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        p=initPresenter();
        if (p != null) {
            p.attachView(this);
        }else {
            try {
                throw new Exception("少年 prenter 没有设置 请在您的Activity 创建 presenter");
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        initData();
    }

    public P getPresenter() {
        return p;
    }

    abstract void initView(View view);
    abstract void initData();
    abstract P initPresenter();
    abstract int setChildContentView();
}

FragmentCart：

public class FragmentCart extends BaseFragment<CartPresenter> implements ICartView, CartsAdapter.UpdateView, View.OnClickListener, CartsAdapter.DeleteView {

    private String urlCarts="https://www.zhaoapi.cn/product/getCarts";
    private String urlDeleteCarts="https://www.zhaoapi.cn/product/deleteCart";
    private CartBean cartBean=new CartBean();
    private DeleteCartBean deleteCartBean=new DeleteCartBean();
    private String uid;
    private String token;
    private SharedPreferences sharedPreferences;

    private ExpandableListView elv_cart;
    private CheckBox cb_cart_select_all;
    private TextView tv_cart_all_money;
    private TextView tv_cart_transport;
    private Button btn_cart_settlement;
    private CartsAdapter adapter;
    private Handler handler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what){
                case 0:
                    adapter.setData(cartBean);
                    adapter.notifyDataSetChanged();
                    //展开所有的分组
                    if (cartBean!=null){
                        for (int i = 0; i < cartBean.getData().size(); i++) {
                            elv_cart.expandGroup(i);
                        }
                    }
                    break;
                case 1:
                    Toast.makeText(getActivity(), deleteCartBean.getMsg(), Toast.LENGTH_SHORT).show();
                    break;
            }
        }
    };

    @Override
    void initView(View view) {
        elv_cart = view.findViewById(R.id.elv_cart);
        cb_cart_select_all = view.findViewById(R.id.cb_cart_select_all);
        tv_cart_all_money = view.findViewById(R.id.tv_cart_all_money);
        tv_cart_transport = view.findViewById(R.id.tv_cart_transport);
        btn_cart_settlement = view.findViewById(R.id.btn_cart_settlement);
        sharedPreferences = getActivity().getSharedPreferences("user", getActivity().MODE_PRIVATE);
        getUidAndToken();
        //去掉ExpandableListView 默认的箭头
        elv_cart.setGroupIndicator(null);
    }

//    @Override
//    public void onHiddenChanged(boolean hidden) {
//        super.onHiddenChanged(hidden);
//        if (!hidden){
//            Log.e("myMessage","购物车页面显示了");
//            getData();
//        }
//    }

    @Subscribe(threadMode = ThreadMode.MAIN, sticky = true)
    public void onMessageEvent(MessageEvent event) {
        if (event.isSuccessClassify()||event.isClickCart()){
            Log.e("myMessage" , "isSuccessClassify:"+event.isSuccessClassify());
            Log.e("myMessage" , "点击购物车:"+event.isClickCart());
            getData();
            EventBus.getDefault().removeStickyEvent(event);
        }
        if (event.isLoginOk()){
            Log.e("myMessage" , "isLoginOk:"+event.isLoginOk());
            getUidAndToken();
        }
    }

    private void getUidAndToken() {
        uid=sharedPreferences.getString("uid",null);
        token=sharedPreferences.getString("token",null);
    }

    private void getData(){
        getUidAndToken();
        if (!(TextUtils.isEmpty(uid)||TextUtils.isEmpty(token))){
//            Log.e("myMessage" , "查询购物车uid:"+uid+"--token:"+token);
            HashMap<String, String> map = new HashMap<>();
            map.put("source","android");
            map.put("uid",uid);
            map.put("token",token);
            getPresenter().getDataFromServer(urlCarts,map,1);
        }else {
            cartBean=null;
            adapter.setData(cartBean);
            adapter.notifyDataSetChanged();
        }
    }

    @Override
    void initData() {
        adapter = new CartsAdapter(getActivity());
        elv_cart.setAdapter(adapter);
        adapter.setUpdateViewListener(this);
        adapter.setDeleteViewListener(this);
        EventBus.getDefault().register(this);
        //全选按钮点击事件
        cb_cart_select_all.setOnClickListener(this);
    }
    private boolean one=true;
    @Override
    public void onSuccess(String success, int flag) {
        Gson gson = new Gson();
        switch (flag){
            case 1:
                cartBean = gson.fromJson(success, CartBean.class);
                handler.sendEmptyMessage(0);
                if (one){
                    MessageEvent messageEvent = new MessageEvent();
                    messageEvent.setSuccessCart(true);
                    EventBus.getDefault().postSticky(messageEvent);
                    one=false;
                }
                break;
            case 2:
                deleteCartBean = gson.fromJson(success, DeleteCartBean.class);
                handler.sendEmptyMessage(1);
                break;
        }
    }

    @Override
    public void update(boolean isAllSelected, int count, double price) {
        btn_cart_settlement.setText("结算(" + count + ")");
        tv_cart_all_money.setText("¥" + price);
        cb_cart_select_all.setChecked(isAllSelected);
    }

    @Override
    public void onClick(View v) {
        selectAll();
    }

    private void selectAll() {
        int allCount = cartBean.getAllCount();
        double allMoney = cartBean.getAllMoney();
        if (cb_cart_select_all.isChecked()) {
            cartBean.setAllSelect(true);
            for (int i = 0; i < cartBean.getData().size(); i++) {
                cartBean.getData().get(i).setSelected(true);
                for (int n = 0; n < cartBean.getData().get(i).getList().size(); n++) {
                    if (!cartBean.getData().get(i).getList().get(n).isSelected()) {
                        allCount++;
                        allMoney=CalcUtils.add(allMoney,
                                CalcUtils.multiply((double) cartBean.getData().get(i).getList().get(n).getNum(),
                                        cartBean.getData().get(i).getList().get(n).getBargainPrice()));
                        cartBean.getData().get(i).getList().get(n).setSelected(true);
                    }
                }
            }
        } else {
            cartBean.setAllSelect(false);
            for (int i = 0; i < cartBean.getData().size(); i++) {
                cartBean.getData().get(i).setSelected(false);
                for (int n = 0; n < cartBean.getData().get(i).getList().size(); n++) {
                    cartBean.getData().get(i).getList().get(n).setSelected(false);
                }
                allCount = 0;
                allMoney = 0;
            }
        }
        cartBean.setAllMoney(allMoney);
        cartBean.setAllCount(allCount);
        update(cartBean.isAllSelect(), allCount, allMoney);
        adapter.notifyDataSetChanged();
    }

    @Override
    public void delete(final CartsAdapter.UpdateView updateViewListener, final CheckBox cbItem, final EditText etCount, ImageView imgDelete, final int groupPosition, final int childPosition) {
        //删除
        imgDelete.setOnClickListener(new View.OnClickListener() {
            int allCount = cartBean.getAllCount();
            double allMoney = cartBean.getAllMoney();
            @Override
            public void onClick(View v) {
                HashMap<String, String> map = new HashMap<>();
                map.put("uid",uid);
                map.put("token",token);
                map.put("pid",cartBean.getData().get(groupPosition).getList().get(childPosition).getPid()+"");
                getPresenter().getDataFromServer(urlDeleteCarts,map,2);

                if(cbItem.isChecked()){
                    allCount--;
                    allMoney=CalcUtils.sub(allMoney,
                            CalcUtils.multiply((double) cartBean.getData().get(groupPosition).getList().get(childPosition).getNum(),
                                    cartBean.getData().get(groupPosition).getList().get(childPosition).getBargainPrice()));
                    cartBean.getData().get(groupPosition).getList().get(childPosition).setNum(Integer.valueOf(etCount.getText().toString()));
                }
                cartBean.getData().get(groupPosition).getList().remove(childPosition);
                if (cartBean.getData().get(groupPosition).getList().size() == 0) {
                    cartBean.getData().remove(groupPosition);
                }
                cartBean.setAllCount(allCount);
                cartBean.setAllMoney(allMoney);
                adapter.notifyDataSetChanged();
                updateViewListener.update(cartBean.isAllSelect(), allCount, allMoney);
            }
        });
    }

    @Override
    CartPresenter initPresenter() {
        return new CartPresenter();
    }

    @Override
    int setChildContentView() {
        return R.layout.fragment_cart;
    }

    @Override
    public void onError(String error) {

    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        EventBus.getDefault().unregister(this);
        getPresenter().detachView();
    }
}

CartsAdapter：

public class CartsAdapter extends BaseExpandableListAdapter{
    private Context mContext;
    private UpdateView updateViewListener;
    private DeleteView deleteView;
    private CartBean cartBean;

    public CartsAdapter(Context context) {
        this.mContext = context;
    }

    public void setData(CartBean cartBean){
        this.cartBean=cartBean;
    }

    public void setUpdateViewListener(UpdateView listener) {
        if (updateViewListener == null) {
            this.updateViewListener = listener;
        }
    }

    public void setDeleteViewListener(DeleteView deleteView){
        if (this.deleteView == null) {
            this.deleteView = deleteView;
        }
    }

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

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

    @Override
    public Object getGroup(int groupPosition) {
        return cartBean.getData().get(groupPosition);
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return cartBean.getData().get(groupPosition).getList().get(childPosition);
    }

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

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

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

    @Override
    public View getGroupView(final int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        updateViewListener.update(cartBean.isAllSelect(), cartBean.getAllCount(), cartBean.getAllMoney());
        final GroupViewHolder holder;
        if (convertView==null){
            convertView = View.inflate(mContext, R.layout.item_shopingcart_group, null);
            holder=new GroupViewHolder(convertView);
            convertView.setTag(holder);
        }else {
            holder= (GroupViewHolder) convertView.getTag();
        }
        holder.cbGroupItem.setTag(groupPosition);
        holder.tvPosition.setText(cartBean.getData().get(groupPosition).getSellerName());
        //根据获取的状态设置是否被选中
        holder.cbGroupItem.setChecked(cartBean.getData().get(groupPosition).isSelected());
        //选中店铺，商品全选
        holder.cbGroupItem.setOnClickListener(new View.OnClickListener() {
            int allCount = cartBean.getAllCount();//被选中的item数量
            double allMoney = cartBean.getAllMoney();
            int childSize = cartBean.getData().get(groupPosition).getList().size();
            @Override
            public void onClick(View v) {
                cartBean.getData().get(groupPosition).setSelected(holder.cbGroupItem.isChecked());
                Log.e("--groupisSelected--",cartBean.getData().get(groupPosition).isSelected()+"");
                if (holder.cbGroupItem.isChecked()) {
                    for (int i = 0; i < childSize; i++) {
                        if (!cartBean.getData().get(groupPosition).getList().get(i).isSelected()) {
                            allCount++;
                            cartBean.getData().get(groupPosition).getList().get(i).setSelected(holder.cbGroupItem.isChecked());
                            allMoney=CalcUtils.add(allMoney,
                                    CalcUtils.multiply((double) cartBean.getData().get(groupPosition).getList().get(i).getNum(),
                                    cartBean.getData().get(groupPosition).getList().get(i).getBargainPrice()));
                        }
                    }
                } else {
                    allCount -= childSize;
                    for (int i = 0; i < childSize; i++) {
                        cartBean.getData().get(groupPosition).getList().get(i).setSelected(holder.cbGroupItem.isChecked());
                        allMoney=CalcUtils.sub(allMoney,
                                CalcUtils.multiply((double) cartBean.getData().get(groupPosition).getList().get(i).getNum(),
                                cartBean.getData().get(groupPosition).getList().get(i).getBargainPrice()));
                    }
                }
                //父item选中的数量
                int fCount = 0;
                //判断是否所有的父item都被选中，决定全选按钮状态
                for (int i = 0; i < cartBean.getData().size(); i++) {
                    if (cartBean.getData().get(i).isSelected()) {
                        fCount++;
                    }
                }
                if (fCount == cartBean.getData().size()) {
                    cartBean.setAllSelect(true);
                } else {
                    cartBean.setAllSelect(false);
                }
                cartBean.setAllCount(allCount);
                cartBean.setAllMoney(allMoney);
                notifyDataSetChanged();
                updateViewListener.update(cartBean.isAllSelect(), allCount, allMoney);
            }
        });
        return convertView;
    }

    @Override
    public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        final ChildViewHolder holder;
        if (convertView == null) {
            convertView = View.inflate(mContext,R.layout.item_shopingcart_child, null);
            holder = new ChildViewHolder(convertView);
            convertView.setTag(holder);
        } else {
            holder = (ChildViewHolder) convertView.getTag();
        }
        String images = cartBean.getData().get(groupPosition).getList().get(childPosition).getImages();
        String s=images;
        int i = images.indexOf("|");
        if (i!=-1){
            s = images.substring(0, i);
        }
        FrescoUtil.setJianJin(s,holder.imgIcon);
        holder.tvPrice.setText("¥" + cartBean.getData().get(groupPosition).getList().get(childPosition).getBargainPrice());
        holder.tvGoodName.setText(cartBean.getData().get(groupPosition).getList().get(childPosition).getTitle());
        holder.etCount.setText(String.valueOf(cartBean.getData().get(groupPosition).getList().get(childPosition).getNum()));
        //根据获取的状态设置是否被选中
        holder.cbItem.setChecked(cartBean.getData().get(groupPosition).getList().get(childPosition).isSelected());
        //添加商品数量
        holder.tvAdd.setOnClickListener(new View.OnClickListener() {
            int allCount = cartBean.getAllCount();
            double allMoney = cartBean.getAllMoney();
            @Override
            public void onClick(View v) {
                int goodCount = cartBean.getData().get(groupPosition).getList().get(childPosition).getNum();
                cartBean.getData().get(groupPosition).getList().get(childPosition).setNum(addCount(goodCount));
                if (cartBean.getData().get(groupPosition).getList().get(childPosition).isSelected()) {
                    allMoney=CalcUtils.add(allMoney,cartBean.getData().get(groupPosition).getList().get(childPosition).getBargainPrice());
                    updateViewListener.update(cartBean.isAllSelect(), allCount, allMoney);
                }
                cartBean.setAllMoney(allMoney);
                notifyDataSetChanged();
            }
        });
        //减少商品数量
        holder.tvReduce.setOnClickListener(new View.OnClickListener() {
            int allCount = cartBean.getAllCount();
            double allMoney = cartBean.getAllMoney();
            @Override
            public void onClick(View v) {
                int goodCount = cartBean.getData().get(groupPosition).getList().get(childPosition).getNum();
                if (Integer.valueOf(goodCount) > 1) {
                    cartBean.getData().get(groupPosition).getList().get(childPosition).setNum(reduceCount(goodCount));
                    if (cartBean.getData().get(groupPosition).getList().get(childPosition).isSelected()) {
                        allMoney=CalcUtils.sub(allMoney,cartBean.getData().get(groupPosition).getList().get(childPosition).getBargainPrice());
                        updateViewListener.update(cartBean.isAllSelect(), allCount, allMoney);
                    }
                    cartBean.setAllMoney(allMoney);
                    notifyDataSetChanged();
                }
            }
        });
        //商品选中
        holder.cbItem.setOnClickListener(new View.OnClickListener() {
            int allCount = cartBean.getAllCount();
            double allMoney = cartBean.getAllMoney();
            @Override
            public void onClick(View v) {
                int cCount = 0;//子item被选中的数量
                int fcCount = 0;//父item被选中的数量
                if(holder.cbItem.isChecked()){
                    cartBean.getData().get(groupPosition).getList().get(childPosition).setNum(Integer.valueOf(holder.etCount.getText().toString()));
                }
                cartBean.getData().get(groupPosition).getList().get(childPosition).setSelected(holder.cbItem.isChecked());
                //遍历父item所有数据，统计被选中的item数量
                for (int i = 0; i < cartBean.getData().get(groupPosition).getList().size(); i++) {
                    if (cartBean.getData().get(groupPosition).getList().get(i).isSelected()) {
                        cCount++;
                    }
                }
                //判断是否所有的子item都被选中，决定父item状态
                if (cCount == cartBean.getData().get(groupPosition).getList().size()) {
                    cartBean.getData().get(groupPosition).setSelected(true);
                } else {
                    cartBean.getData().get(groupPosition).setSelected(false);
                }
                //判断是否所有的父item都被选中，决定全选按钮状态
                for (int i = 0; i < cartBean.getData().size(); i++) {
                    if (cartBean.getData().get(i).isSelected()) {
                        fcCount++;
                    }
                }
                if (fcCount == cartBean.getData().size()) {
                    cartBean.setAllSelect(true);
                } else {
                    cartBean.setAllSelect(false);
                }
                //判断子item状态，更新结算总商品数和合计Money
                if (holder.cbItem.isChecked()) {
                    allCount++;
                    allMoney=CalcUtils.add(allMoney,
                            CalcUtils.multiply((double) cartBean.getData().get(groupPosition).getList().get(childPosition).getNum(),
                            cartBean.getData().get(groupPosition).getList().get(childPosition).getBargainPrice()));
                } else {
                    allCount--;
                    allMoney=CalcUtils.sub(allMoney,
                            CalcUtils.multiply((double) cartBean.getData().get(groupPosition).getList().get(childPosition).getNum(),
                            cartBean.getData().get(groupPosition).getList().get(childPosition).getBargainPrice()));
                    cartBean.getData().get(groupPosition).getList().get(childPosition).setNum(Integer.valueOf(holder.etCount.getText().toString()));
                }
//                Log.e("adapter", "allMoney: "+allMoney);
                cartBean.setAllCount(allCount);
                cartBean.setAllMoney(allMoney);
                notifyDataSetChanged();
                updateViewListener.update(cartBean.isAllSelect(), allCount, allMoney);
            }
        });
        deleteView.delete(updateViewListener,holder.cbItem,holder.etCount,holder.imgDelete,groupPosition,childPosition);
        return convertView;
    }
    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return false;
    }

    private int addCount(int var) {
        Integer integer = Integer.valueOf(var);
        integer++;
        return integer;
    }

    private int reduceCount(int var) {
        Integer integer = Integer.valueOf(var);
        if (integer > 1) {
            integer--;
        }
        return integer;
    }

    class GroupViewHolder {

        CheckBox cbGroupItem;
        TextView tvPosition;

        public GroupViewHolder(View view) {
            cbGroupItem = view.findViewById(R.id.cb_cart_item_group);
            tvPosition = view.findViewById(R.id.tv_cart_item_group);
        }
    }
    class ChildViewHolder {
        CheckBox cbItem;
        TextView tvPrice;
        TextView tvGoodName;
        EditText etCount;
        TextView tvReduce;
        TextView tvAdd;
        ImageView imgDelete;
        SimpleDraweeView imgIcon;

        public ChildViewHolder(View view) {
            cbItem = view.findViewById(R.id.cb_cart_item_child);
            tvPrice = view.findViewById(R.id.tv_cart_item_child_price);
            tvGoodName = view.findViewById(R.id.tv_cart_item_child_name);
            etCount = view.findViewById(R.id.et_cart_item_child_count);
            tvReduce = view.findViewById(R.id.tv_cart_item_child_reduce);
            tvAdd = view.findViewById(R.id.tv_cart_item_child_add);
            imgDelete = view.findViewById(R.id.img_cart_item_child_delete);
            imgIcon = view.findViewById(R.id.sdv_cart_item_child);
        }
    }
    public interface UpdateView {
        void update(boolean isAllSelected, int count, double price);
    }
    public interface DeleteView {
        void delete(UpdateView updateViewListener, CheckBox cbItem, EditText etCount, ImageView imgDelete, int groupPosition, int childPosition);
    }
}

IBaseView：

public interface IBaseView { }

ICartView：

public interface ICartView extends IBaseView {
    void onSuccess(String success);
    void onError(String error);
}

fragment_cart.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <ExpandableListView
        android:id="@+id/elv_cart"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:scrollbars="none"
        android:divider="@null"/>
    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="@color/divide_line"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="49dp"
        android:background="@android:color/white"
        android:gravity="center_vertical"
        android:orientation="horizontal">
        <CheckBox
            android:id="@+id/cb_cart_select_all"
            android:layout_width="24dp"
            android:layout_height="24dp"
            android:layout_marginLeft="15dp"/>
        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:layout_weight="0.69"
            android:text="全选"
            android:textColor="#333333"
            android:textSize="15sp" />
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="end"
            android:orientation="vertical">
            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="合计"
                    android:textColor="#333333"
                    android:textSize="15sp" />
                <TextView
                    android:id="@+id/tv_cart_all_money"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="¥0"
                    android:textColor="#FE3824"
                    android:textSize="15sp" />
            </LinearLayout>
            <TextView
                android:id="@+id/tv_cart_transport"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="运费：¥0"
                android:textColor="#999999"
                android:textSize="11sp" />
        </LinearLayout>
        <Button
            android:id="@+id/btn_cart_settlement"
            android:layout_width="95dp"
            android:layout_height="match_parent"
            android:layout_marginLeft="15dp"
            android:background="#FE3824"
            android:text="结算(0)"
            android:textColor="@android:color/white"
            android:textSize="16sp" />
    </LinearLayout>
</LinearLayout>

item_shopingcart_group.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@android:color/white"
    android:orientation="vertical">

    <View
        android:layout_width="match_parent"
        android:layout_height="3dp"
        android:background="@color/divide_line" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:padding="15dp">

        <CheckBox
            android:id="@+id/cb_cart_item_group"
            android:layout_width="24dp"
            android:layout_height="24dp"
            android:focusable="false"/>

        <TextView
            android:id="@+id/tv_cart_item_group"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginLeft="15dp"
            android:drawableLeft="@drawable/dianpu"
            android:drawablePadding="5dp"
            android:gravity="center_vertical"
            android:text="京东旗舰店发货"
            android:textColor="#333333"
            android:textSize="15sp" />
    </LinearLayout>
</LinearLayout>

item_shopingcart_child.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@android:color/white"
    android:orientation="horizontal"
    android:paddingBottom="15dp"
    android:paddingRight="15dp">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:gravity="center"
        android:paddingLeft="15dp"
        android:paddingRight="17dp">
        <CheckBox
            android:id="@+id/cb_cart_item_child"
            android:layout_width="24dp"
            android:layout_height="24dp"
            android:layout_gravity="center_vertical"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <View
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:background="@color/divide_line" />
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="15dp"
            android:orientation="horizontal">
            <com.facebook.drawee.view.SimpleDraweeView
                android:id="@+id/sdv_cart_item_child"
                android:layout_width="90dp"
                android:layout_height="90dp"
                app:placeholderImage="@mipmap/ic_launcher"/>
            <RelativeLayout
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_marginLeft="15dp"
                android:layout_marginTop="8dp"
                android:layout_weight="1">
                <TextView
                    android:id="@+id/tv_cart_item_child_name"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:maxLines="1"
                    android:ellipsize="end"
                    android:text="" />
                <TextView
                    android:id="@+id/tv_cart_item_child_reduce"
                    android:layout_width="30dp"
                    android:layout_height="30dp"
                    android:layout_below="@id/tv_cart_item_child_name"
                    android:layout_marginTop="6dp"
                    android:background="@drawable/selector_shopping_cart_subtract"
                    android:gravity="center"
                    android:text="-"
                    android:textColor="@color/text_666666"
                    android:textSize="15sp" />
                <EditText
                    android:id="@+id/et_cart_item_child_count"
                    android:layout_width="49dp"
                    android:layout_height="30dp"
                    android:layout_alignTop="@+id/tv_cart_item_child_reduce"
                    android:layout_toRightOf="@+id/tv_cart_item_child_reduce"
                    android:layout_marginBottom="1dp"
                    android:background="@drawable/bg_input_box"
                    android:gravity="center"
                    android:inputType="number"
                    android:maxLength="6"
                    android:text="1"
                    android:textColor="@color/text_666666"
                    android:textCursorDrawable="@null"
                    android:textSize="12sp" />
                <TextView
                    android:id="@+id/tv_cart_item_child_add"
                    android:layout_width="30dp"
                    android:layout_height="30dp"
                    android:layout_alignTop="@+id/tv_cart_item_child_reduce"
                    android:layout_toRightOf="@id/et_cart_item_child_count"
                    android:background="@drawable/selector_shopping_cart_add"
                    android:gravity="center"
                    android:text="+"
                    android:textColor="@color/text_666666"
                    android:textSize="15sp" />
                <TextView
                    android:id="@+id/tv_cart_item_child_price"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_below="@id/tv_cart_item_child_reduce"
                    android:text="¥899"
                    android:textColor="#FE3824"
                    android:textSize="13sp" />
            </RelativeLayout>
            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="18dp"
                android:gravity="end"
                android:orientation="vertical">
            </LinearLayout>
            <ImageView
                android:id="@+id/img_cart_item_child_delete"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_vertical"
                android:layout_marginTop="5dp"
                android:src="@drawable/rublish" />
        </LinearLayout>
    </LinearLayout>
</LinearLayout>

colors.xml：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#3F51B5</color>
    <color name="colorPrimaryDark">#303F9F</color>
    <color name="colorAccent">#FF4081</color>
    <color name = "main_grey" >#eeeeee</color >
    <color name="divide_line">#eeeeee</color>
    <color name = "text_666666" >#666666</color >
</resources>

src\main\res\drawable\selector_shopping_cart_add.xml：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/btn_shopping_cart_add_press" android:state_checked="true" />
    <item android:drawable="@drawable/btn_shopping_cart_add_press" android:state_pressed="true" />
    <item android:drawable="@drawable/btn_shopping_cart_add_press" android:state_selected="true" />
    <item android:drawable="@drawable/btn_shopping_cart_add_normal" />
</selector>

src\main\res\drawable\selector_shopping_cart_subtract.xml：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/btn_shopping_cart_subtract_press" android:state_checked="true" />
    <item android:drawable="@drawable/btn_shopping_cart_subtract_press" android:state_pressed="true" />
    <item android:drawable="@drawable/btn_shopping_cart_subtract_press" android:state_selected="true" />
    <item android:drawable="@drawable/btn_shopping_cart_subtract_normal" />
</selector>

CartBean：

public class CartBean {
    /**
     * msg : 请求成功
     * code : 0
     * data : [{"list":[{"bargainPrice":111.99,"createtime":"2017-10-14T21:39:05","detailUrl":"https://item.m.jd.com/product/4719303.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends","images":"https://m.360buyimg.com/n0/jfs/t9004/210/1160833155/647627/ad6be059/59b4f4e1N9a2b1532.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t7504/338/63721388/491286/f5957f53/598e95f1N7f2adb87.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t7441/10/64242474/419246/adb30a7d/598e95fbNd989ba0a.jpg!q70.jpg","num":1,"pid":1,"price":118,"pscid":1,"selected":0,"sellerid":17,"subhead":"每个中秋都不能简单，无论身在何处，你总需要一块饼让生活更圆满，京东月饼让爱更圆满京东自营，闪电配送，更多惊喜，快用手指戳一下","title":"北京稻香村 稻香村中秋节月饼 老北京月饼礼盒655g"}],"sellerName":"商家17","sellerid":"17"},{"list":[{"bargainPrice":111.99,"createtime":"2017-10-14T21:39:05","detailUrl":"https://item.m.jd.com/product/4719303.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends","images":"https://m.360buyimg.com/n0/jfs/t9004/210/1160833155/647627/ad6be059/59b4f4e1N9a2b1532.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t7504/338/63721388/491286/f5957f53/598e95f1N7f2adb87.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t7441/10/64242474/419246/adb30a7d/598e95fbNd989ba0a.jpg!q70.jpg","num":1,"pid":2,"price":299,"pscid":1,"selected":0,"sellerid":18,"subhead":"每个中秋都不能简单，无论身在何处，你总需要一块饼让生活更圆满，京东月饼让爱更圆满京东自营，闪电配送，更多惊喜，快用手指戳一下","title":"北京稻香村 稻香村中秋节月饼 老北京月饼礼盒655g"}],"sellerName":"商家18","sellerid":"18"},{"list":[{"bargainPrice":22.9,"createtime":"2017-10-03T23:53:28","detailUrl":"https://item.m.jd.com/product/2542855.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends","images":"https://m.360buyimg.com/n0/jfs/t1930/284/2865629620/390243/e3ade9c4/56f0a08fNbd3a1235.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t2137/336/2802996626/155915/e5e90d7a/56f0a09cN33e01bd0.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t1882/31/2772215910/389956/c8dbf370/56f0a0a2Na0c86ea6.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t2620/166/2703833710/312660/531aa913/57709035N33857877.jpg!q70.jpg","num":1,"pid":44,"price":789,"pscid":2,"selected":0,"sellerid":21,"subhead":"三只松鼠零食特惠，专区满99减50，满199减100，火速抢购》","title":"三只松鼠 坚果炒货 零食奶油味 碧根果225g/袋"}],"sellerName":"商家21","sellerid":"21"}]
     */

    private String msg;
    private String code;
    private int allCount;
    private double allMoney;
    private boolean isAllSelect;
    private List<DataBean> data;

    public boolean isAllSelect() {
        return isAllSelect;
    }

    public void setAllSelect(boolean allSelect) {
        isAllSelect = allSelect;
    }

    public double getAllMoney() {
        return allMoney;
    }

    public void setAllMoney(double allMoney) {
        this.allMoney = allMoney;
    }

    public int getAllCount() {
        return allCount;
    }

    public void setAllCount(int allCount) {
        this.allCount = allCount;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public List<DataBean> getData() {
        return data;
    }

    public void setData(List<DataBean> data) {
        this.data = data;
    }

    public static class DataBean {
        /**
         * list : [{"bargainPrice":111.99,"createtime":"2017-10-14T21:39:05","detailUrl":"https://item.m.jd.com/product/4719303.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends","images":"https://m.360buyimg.com/n0/jfs/t9004/210/1160833155/647627/ad6be059/59b4f4e1N9a2b1532.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t7504/338/63721388/491286/f5957f53/598e95f1N7f2adb87.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t7441/10/64242474/419246/adb30a7d/598e95fbNd989ba0a.jpg!q70.jpg","num":1,"pid":1,"price":118,"pscid":1,"selected":0,"sellerid":17,"subhead":"每个中秋都不能简单，无论身在何处，你总需要一块饼让生活更圆满，京东月饼让爱更圆满京东自营，闪电配送，更多惊喜，快用手指戳一下","title":"北京稻香村 稻香村中秋节月饼 老北京月饼礼盒655g"}]
         * sellerName : 商家17
         * sellerid : 17
         */

        private String sellerName;
        private String sellerid;
        private boolean isSelected;
        private List<ListBean> list;

        public boolean isSelected() {
            return isSelected;
        }

        public void setSelected(boolean selected) {
            isSelected = selected;
        }

        public String getSellerName() {
            return sellerName;
        }

        public void setSellerName(String sellerName) {
            this.sellerName = sellerName;
        }

        public String getSellerid() {
            return sellerid;
        }

        public void setSellerid(String sellerid) {
            this.sellerid = sellerid;
        }

        public List<ListBean> getList() {
            return list;
        }

        public void setList(List<ListBean> list) {
            this.list = list;
        }

        public static class ListBean {
            /**
             * bargainPrice : 111.99
             * createtime : 2017-10-14T21:39:05
             * detailUrl : https://item.m.jd.com/product/4719303.html?utm_source=androidapp&utm_medium=appshare&utm_campaign=t_335139774&utm_term=QQfriends
             * images : https://m.360buyimg.com/n0/jfs/t9004/210/1160833155/647627/ad6be059/59b4f4e1N9a2b1532.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t7504/338/63721388/491286/f5957f53/598e95f1N7f2adb87.jpg!q70.jpg|https://m.360buyimg.com/n0/jfs/t7441/10/64242474/419246/adb30a7d/598e95fbNd989ba0a.jpg!q70.jpg
             * num : 1
             * pid : 1
             * price : 118
             * pscid : 1
             * selected : 0
             * sellerid : 17
             * subhead : 每个中秋都不能简单，无论身在何处，你总需要一块饼让生活更圆满，京东月饼让爱更圆满京东自营，闪电配送，更多惊喜，快用手指戳一下
             * title : 北京稻香村 稻香村中秋节月饼 老北京月饼礼盒655g
             */

            private double bargainPrice;
            private String createtime;
            private String detailUrl;
            private String images;
            private int num;
            private int pid;
            private double price;
            private int pscid;
            private int selected;
            private int sellerid;
            private String subhead;
            private String title;
            private boolean isSelected;

            public boolean isSelected() {
                return isSelected;
            }

            public void setSelected(boolean selected) {
                isSelected = selected;
            }

            public double getBargainPrice() {
                return bargainPrice;
            }

            public void setBargainPrice(double bargainPrice) {
                this.bargainPrice = bargainPrice;
            }

            public String getCreatetime() {
                return createtime;
            }

            public void setCreatetime(String createtime) {
                this.createtime = createtime;
            }

            public String getDetailUrl() {
                return detailUrl;
            }

            public void setDetailUrl(String detailUrl) {
                this.detailUrl = detailUrl;
            }

            public String getImages() {
                return images;
            }

            public void setImages(String images) {
                this.images = images;
            }

            public int getNum() {
                return num;
            }

            public void setNum(int num) {
                this.num = num;
            }

            public int getPid() {
                return pid;
            }

            public void setPid(int pid) {
                this.pid = pid;
            }

            public double getPrice() {
                return price;
            }

            public void setPrice(double price) {
                this.price = price;
            }

            public int getPscid() {
                return pscid;
            }

            public void setPscid(int pscid) {
                this.pscid = pscid;
            }

            public int getSelected() {
                return selected;
            }

            public void setSelected(int selected) {
                this.selected = selected;
            }

            public int getSellerid() {
                return sellerid;
            }

            public void setSellerid(int sellerid) {
                this.sellerid = sellerid;
            }

            public String getSubhead() {
                return subhead;
            }

            public void setSubhead(String subhead) {
                this.subhead = subhead;
            }

            public String getTitle() {
                return title;
            }

            public void setTitle(String title) {
                this.title = title;
            }
        }
    }
}