Android购物车功能（全选、全不选、总价）

创建bean类

         bean类中定义boolean类型的变量，生成getter、setter方法

public class ShopCartBean implements Serializable {
    private String msg;
    private String code;
    private List data;

    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 getData() {
        return data;
    }

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

    public static class DataBean {
        private String sellerName;
        private String sellerid;
        private List list;
        private boolean isCheck = false;

        public boolean isCheck() {
            return isCheck;
        }

        public void setCheck(boolean check) {
            isCheck = check;
        }

        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 getList() {
            return list;
        }

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

        public static class ListBean {

            private String bargainPrice;
            private String createtime;
            private String detailUrl;
            private String images;
            private int num;
            private String pid;
            private int price;
            private String pscid;
            private String selected;
            private String sellerid;
            private String subhead;
            private String title;
            private boolean isCheck = false;

            public boolean isCheck() {
                return isCheck;
            }

            public void setCheck(boolean check) {
                isCheck = check;
            }

            public String getBargainPrice() {
                return bargainPrice;
            }

            public void setBargainPrice(String 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 String getPid() {
                return pid;
            }

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

            public int getPrice() {
                return price;
            }

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

            public String getPscid() {
                return pscid;
            }

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

            public String getSelected() {
                return selected;
            }

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

            public String getSellerid() {
                return sellerid;
            }

            public void setSellerid(String 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;
            }
        }
    }
}

Activity或Fragment（这里用的是Fragment）

public class ShopCarFragment extends Fragment implements IShopCartView {
    @BindView(R.id.shopcart_recycler_view)
    RecyclerView shopcartRecyclerView;
    Unbinder unbinder;
    @BindView(R.id.shop_checkbox)
    CheckBox shopCheckbox;
    @BindView(R.id.shop_total)
    TextView shopTotal;
    @BindView(R.id.shop_jie)
    Button shopJie;
    private Map map;
    private ShopCartPresenter shopCartPresenter;
    private List cartBeanData;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.shop_car_layout, container, false);
        map = new HashMap<>();
        unbinder = ButterKnife.bind(this, view);
        shopCartPresenter = new ShopCartPresenter(ShopCarFragment.this);
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
        linearLayoutManager.setOrientation(OrientationHelper.VERTICAL);
        shopcartRecyclerView.setLayoutManager(linearLayoutManager);
        //shopcartRecyclerView.addItemDecoration(new SpaceItemDecoration(20));
        map.put("uid", "71");
        shopCartPresenter.getPresenterData(map);
        return view;
    }

    @Override
    public void getViewData(String data) {
        Gson gson = new Gson();
        ShopCartBean shopCartBean = gson.fromJson(data, ShopCartBean.class);
        cartBeanData = shopCartBean.getData();
        //创建适配器
        final MyShopCartAdapter shopCartAdapter = new MyShopCartAdapter(getActivity(), cartBeanData);
        shopcartRecyclerView.setAdapter(shopCartAdapter);

        shopCartAdapter.setShopCallBackListener(new MyShopCartAdapter.ShopCallBackListener() {
            @Override
            public void callBack(List list) {
                //在这里重新遍历已经改状态后的数据，
                // 这里不能break跳出，因为还需要计算后面点击商品的价格和数目，所以必须跑完整个循环
                double totalPrice = 0;
                //勾选商品的数量，不是该商品购买的数量
                int num = 0;
                //所有商品总数，和上面的数量做比对，如果两者相等，则说明全选
                int totalNum = 0;
                for (int i = 0; i < list.size(); i++) {
                    List listAll = list.get(i).getList();
                    for (int j = 0; j < listAll.size(); j++) {
                       totalNum = totalNum + listAll.get(j).getNum();
                        //取选中的状态
                        if (listAll.get(j).isCheck()) {
                            totalPrice += listAll.get(j).getPrice() * listAll.get(j).getNum();
                            num += listAll.get(j ).getNum();
                        }
                    }
                }
                if (num < totalNum) {
                    shopCheckbox.setChecked(false);
                }else {
                    shopCheckbox.setChecked(true);
                }
                shopTotal.setText("合计:￥"+totalPrice);
                shopJie.setText("去计算（"+num+"）");
            }
        });
        shopCheckbox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                checkSeller(shopCheckbox.isChecked());
                shopCartAdapter.notifyDataSetChanged();
            }
        });

        if (cartBeanData!=null){
            cartBeanData.remove(0);
            shopCartAdapter.setList(cartBeanData);
            shopCartAdapter.notifyDataSetChanged();
        }

    }

    private void checkSeller(boolean bool) {
        int totalPrice = 0;
        int num = 0;
        for (int a = 0; a < cartBeanData.size(); a++) {
            //遍历商家，改变状态
            ShopCartBean.DataBean dataBean = cartBeanData.get(a);
            dataBean.setCheck(bool);
            List listAll = cartBeanData.get(a).getList();
            for (int i = 0; i < listAll.size(); i++) {
                //遍历商品，改变状态
                listAll.get(i).setCheck(bool);
               totalPrice +=  listAll.get(i).getPrice() * listAll.get(i).getNum();
                num += listAll.get(i).getNum();
            }
        }
        if (bool) {
            shopTotal.setText("合计：" + totalPrice);
            shopJie.setText("去结算(" + num + ")");
        } else {
            shopTotal.setText("合计：0.00");
            shopJie.setText("去结算(0)");
        }
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        unbinder.unbind();
    }
}

创建商家的Adapter

public class MyShopCartAdapter extends RecyclerView.Adapter {


    private Context context;
    private List cartBeanData;
    private List listBeans;
    private ShopCallBackListener shopCallBackListener;

    public void setShopCallBackListener(ShopCallBackListener shopCallBackListener) {
        this.shopCallBackListener = shopCallBackListener;
    }

    public MyShopCartAdapter(Context context, List cartBeanData) {
        this.context = context;
        this.cartBeanData = cartBeanData;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(context).inflate(R.layout.merchant_layout, viewGroup, false);
        ViewHolder holder = new ViewHolder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(@NonNull final ViewHolder viewHolder, final int i) {
        viewHolder.merchantCheck.setText(cartBeanData.get(i).getSellerName());
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(context);
        linearLayoutManager.setOrientation(OrientationHelper.VERTICAL);
        viewHolder.merchantRecyclerView.setLayoutManager(linearLayoutManager);

        listBeans = cartBeanData.get(i).getList();
        //创建适配器
        final MyShopCartItmeAdapter shopCartItmeAdapter = new MyShopCartItmeAdapter(context,listBeans);
        viewHolder.merchantRecyclerView.setAdapter(shopCartItmeAdapter);
        //viewHolder.merchantRecyclerView.addItemDecoration(new SpaceItemDecoration(10));

        viewHolder.merchantCheck.setChecked(cartBeanData.get(i).isCheck());



        shopCartItmeAdapter.setShopCallBackListener(new MyShopCartItmeAdapter.ShopCallBackListener() {
            @Override
            public void callBack() {
                if (shopCartItmeAdapter!=null){
                    shopCallBackListener.callBack(cartBeanData);
                }
                List listBeanList = cartBeanData.get(i).getList();
                boolean isAllChecked = true;
                for (ShopCartBean.DataBean.ListBean bean: listBeanList) {
                    if (!bean.isCheck()){
                        isAllChecked= false;
                        break;
                    }
                }
                viewHolder.merchantCheck.setChecked(isAllChecked);
                cartBeanData.get(i).setCheck(isAllChecked);
            }
        });

        viewHolder.merchantCheck.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                cartBeanData.get(i).setCheck(viewHolder.merchantCheck.isChecked());
                shopCartItmeAdapter.selectAllOrRemoveAll(viewHolder.merchantCheck.isChecked());
            }
        });
    }

    @Override
    public int getItemCount() {
        return cartBeanData.size();
    }

    @OnClick(R.id.merchant_check)
    public void onViewClicked() {
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        @BindView(R.id.merchant_check)
        CheckBox merchantCheck;
        @BindView(R.id.merchant_recycler_view)
        RecyclerView merchantRecyclerView;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
        }
    }

    public interface ShopCallBackListener {
        void callBack(List list);
    }

    public void setList(List cartBeanData){
        this.cartBeanData = cartBeanData;
       notifyDataSetChanged();
    }
}

创建商品的adapter

public class MyShopCartItmeAdapter extends RecyclerView.Adapter {


    private Context context;
    private List listBeans;
    private ShopCallBackListener shopCallBackListener;

    public void setShopCallBackListener(ShopCallBackListener shopCallBackListener) {
        this.shopCallBackListener = shopCallBackListener;
    }

    public MyShopCartItmeAdapter(Context context, List listBeans) {
        this.context = context;
        this.listBeans = listBeans;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(context).inflate(R.layout.shopcart_itme_layout, viewGroup, false);
        ViewHolder holder = new ViewHolder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(@NonNull final ViewHolder viewHolder, final int i) {
        Glide.with(context).load(listBeans.get(i).getImages().split("\\|")[0].replace("https", "http")).into(viewHolder.goodsImg);
        viewHolder.googsTitle.setText(listBeans.get(i).getTitle());
        viewHolder.goodsPrice.setText("￥:" + listBeans.get(i).getPrice() + "元");
        viewHolder.custom_edit_text.setText(listBeans.get(i).getNum() + "");
        viewHolder.customView.setClickListener(new CustomView.OnAddOrDelClickListener() {
            @Override
            public void onAddClick(View view) {
                int number = viewHolder.customView.getNumber();
                number++;
                viewHolder.customView.setNumber(number);
                listBeans.get(i).setNum(number);
            }

            @Override
            public void onDelClick(View view) {
                int num = viewHolder.customView.getNumber();
                num--;
                viewHolder.customView.setNumber(num);
                listBeans.get(i).setNum(num);
            }
        });

        //根据记录状态改变勾选
        viewHolder.goodsCheckbox.setChecked(listBeans.get(i).isCheck());
        //选中改变的监听
        viewHolder.goodsCheckbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                //优先改变自己的状态
                listBeans.get(i).setCheck(isChecked);
                if (shopCallBackListener != null) {
                    shopCallBackListener.callBack();
                }
            }
        });
        viewHolder.customView.setData(this, listBeans, i);
        viewHolder.customView.setCallBackListener(new CustomView.CallBackListener() {
            @Override
            public void mycallBack() {
                if (shopCallBackListener != null) {
                    shopCallBackListener.callBack();
                }
            }
        });

    }

    @Override
    public int getItemCount() {
        return listBeans.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder {
        private final TextView custom_edit_text;
        @BindView(R.id.goods_checkbox)
        CheckBox goodsCheckbox;
        @BindView(R.id.goods_img)
        ImageView goodsImg;
        @BindView(R.id.googs_title)
        TextView googsTitle;
        @BindView(R.id.goods_price)
        TextView goodsPrice;
        @BindView(R.id.custom_view)
        CustomView customView;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            ButterKnife.bind(this, itemView);
            custom_edit_text = itemView.findViewById(R.id.custom_edit_text);
        }
    }

    //在子商品中的adapter中，修改子商品的全选和反选
    public void selectAllOrRemoveAll(boolean selectAll) {
        for (ShopCartBean.DataBean.ListBean listBean : listBeans) {
            listBean.setCheck(selectAll);
        }
        notifyDataSetChanged();
    }

    //定义接口
    public interface ShopCallBackListener {
        void callBack();
    }
}

自定义view类（加加、减减功能）

public class CustomView extends RelativeLayout {
    @BindView(R.id.custom_del)
    ImageView customDel;
    @BindView(R.id.custom_edit_text)
    EditText customEditText;
    @BindView(R.id.custom_add)
    ImageView customAdd;
    private OnAddOrDelClickListener clickListener;
    private MyShopCartItmeAdapter myShopCartItemAdapter;
    private CallBackListener call1BackListener;
    private List list = new ArrayList<>();
    private int position;
    int num = 0;

    public void setCallBackListener(CallBackListener callBackListener) {
        this.call1BackListener = callBackListener;
    }

    public void setClickListener(OnAddOrDelClickListener clickListener) {
        this.clickListener = clickListener;
    }

    public CustomView(Context context) {
        super(context);
    }

    public CustomView(Context context, AttributeSet attrs) {
        super(context, attrs);

        View view = View.inflate(context, R.layout.custom_layout, null);
        ButterKnife.bind(this, view);
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.edit_shopcart);
        String num = typedArray.getString(R.styleable.edit_shopcart_num);
        typedArray.recycle();
        customEditText.setText(num);
        addView(view);
    }

    public CustomView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public CustomView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    public void setData(MyShopCartItmeAdapter myShopCartItemAdapter, List list, int i) {
        this.myShopCartItemAdapter = myShopCartItemAdapter;
        this.list = list;
        position = i;
        num = list.get(i).getNum();
        customEditText.setText(num + "");
    }

    @OnClick({R.id.custom_del, R.id.custom_add})
    public void onViewClicked(View view) {
        String string = customEditText.getText().toString();
        switch (view.getId()) {
            case R.id.custom_del:
                if (string.length() > 0) {
                    clickListener.onDelClick(view);
                    call1BackListener.mycallBack();
                    myShopCartItemAdapter.notifyItemChanged(position);
                } else {
                    mToast();
                }
                break;
            case R.id.custom_add:
                if (string.length() > 0) {
                    clickListener.onAddClick(view);
                    call1BackListener.mycallBack();
                    myShopCartItemAdapter.notifyItemChanged(position);
                } else {
                    mToast();
                }
                break;
        }
    }

    public void setNumber(int num) {
        if (num > 0) {
            customEditText.setText(num + "");
        } else {
            toast();
        }
    }

    public int getNumber() {
        String numStr = customEditText.getText().toString().trim();
        num = Integer.valueOf(numStr);
        return num;
    }

    private void toast() {
        Toast.makeText(getContext(), "不能为0", Toast.LENGTH_SHORT).show();
    }

    private void mToast() {
        Toast.makeText(getContext(), "不能为空", Toast.LENGTH_SHORT).show();
    }

    public interface OnAddOrDelClickListener {
        void onAddClick(View view);

        void onDelClick(View view);
    }

    public interface CallBackListener {
        void mycallBack();
    }

}

自定义view布局