小编给大家分享一下Android如何实现商城购物车功能，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！
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最近公司项目做商城模块，需要实现购物车功能，主要实现了单选、全选，金额合计，商品删除，商品数量加减等功能，先看看效果图：
在这里插入图片描述
一、实现步骤：
0、添加依赖库
1.购物车主界面布局文件(activity_main.xml)
2.购物车实现逻辑主界面(MainActivity.class)
3.使用ExpandableListView,继承BaseExpandableListAdapter
4.购物车数据的bean类(ShoppingCarDataBean.class)
5.分店铺实现布局
6.购物车中商品Item布局文件
二、实现过程：
0.添加依赖库
implementation 'com.jakewharton:butterknife:5.1.1'
implementation 'com.google.code.gson:gson:2.2.4'
implementation 'com.github.bumptech.glide:glide:3.7.0'
1.购物车主界面布局文件(activity_main.xml)
2.购物车实现逻辑主界面(MainActivity.class)
package com.showly.yglin.shoppingcar;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.KeyEvent;
import android.view.View;
import android.widget.Button;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.google.gson.Gson;
import com.showly.yglin.shoppingcar.adapter.ShoppingCarAdapter;
import com.showly.yglin.shoppingcar.bean.ShoppingCarDataBean;
import com.showly.yglin.shoppingcar.customview.RoundCornerDialog;
import com.showly.yglin.shoppingcar.util.ToastUtil;
import java.util.ArrayList;
import java.util.List;
import butterknife.ButterKnife;
import butterknife.InjectView;
import butterknife.OnClick;
/**
* 购物车实现
* 主要功能：
* 1.单选、全选；
* 2.合计；
* 3.删除；
* 4.商品数量加减；
*/
public class MainActivity extends AppCompatActivity {
@InjectView(R.id.tv_titlebar_center)
TextView tvTitlebarCenter;
@InjectView(R.id.tv_titlebar_right)
TextView tvTitlebarRight;
@InjectView(R.id.elv_shopping_car)
ExpandableListView elvShoppingCar;
@InjectView(R.id.iv_select_all)
ImageView ivSelectAll;
@InjectView(R.id.ll_select_all)
LinearLayout llSelectAll;
@InjectView(R.id.btn_order)
Button btnOrder;
@InjectView(R.id.btn_delete)
Button btnDelete;
@InjectView(R.id.tv_total_price)
TextView tvTotalPrice;
@InjectView(R.id.rl_total_price)
RelativeLayout rlTotalPrice;
@InjectView(R.id.rl)
RelativeLayout rl;
@InjectView(R.id.iv_no_contant)
ImageView ivNoContant;
@InjectView(R.id.rl_no_contant)
RelativeLayout rlNoContant;
@InjectView(R.id.tv_titlebar_left)
ImageView tvTitlebarLeft;
//模拟的购物车数据（实际开发中使用后台返回的数据）
private String shoppingCarData = "{\n" +
" \"code\": 200,\n" +
" \"datas\": [\n" +
" {\n" +
" \"goods\": [\n" +
" {\n" +
" \"goods_id\": \"111111\",\n" +
" \"goods_image\": \"http://pic.58pic.com/58pic/15/62/69/34K58PICbmZ_1024.jpg\",\n" +
" \"goods_name\": \"三国演义\",\n" +
" \"goods_num\": \"2\",\n" +
" \"goods_price\": \"15.00\"\n" +
" }\n" +
" ],\n" +
" \"store_id\": \"1\",\n" +
" \"store_name\": \"书店杂货铺\"\n" +
" },\n" +
" {\n" +
" \"goods\": [\n" +
" {\n" +
" \"goods_id\": \"222221\",\n" +
" \"goods_image\": \"http://file06.16sucai.com/2016/0511/9711205e4c003182edeed83355e6f1c7.jpg\",\n" +
" \"goods_name\": \"西游记\",\n" +
" \"goods_num\": \"2\",\n" +
" \"goods_price\": \"12.00\"\n" +
" },\n" +
" {\n" +
" \"goods_id\": \"222222\",\n" +
" \"goods_image\": \"http://img01.taopic.com/150424/240473-1504240U13615.jpg\",\n" +
" \"goods_name\": \"封神榜\",\n" +
" \"goods_num\": \"1\",\n" +
" \"goods_price\": \"28.00\"\n" +
" }\n" +
" ],\n" +
" \"store_id\": \"2\",\n" +
" \"store_name\": \"亚马逊书店\"\n" +
" },\n" +
" {\n" +
" \"goods\": [\n" +
" {\n" +
" \"goods_id\": \"333331\",\n" +
" \"goods_image\": \"http://pic22.nipic.com/20120718/8002769_100147127333_2.jpg\",\n" +
" \"goods_name\": \"水浒传\",\n" +
" \"goods_num\": \"3\",\n" +
" \"goods_price\": \"18.00\"\n" +
" },\n" +
" {\n" +
" \"goods_id\": \"333332\",\n" +
" \"goods_image\": \"http://pic.58pic.com/58pic/14/71/50/40e58PICy54_1024.jpg\",\n" +
" \"goods_name\": \"封神演义\",\n" +
" \"goods_num\": \"3\",\n" +
" \"goods_price\": \"32.00\"\n" +
" },\n" +
" {\n" +
" \"goods_id\": \"333333\",\n" +
" \"goods_image\": \"http://img01.taopic.com/150518/318750-15051PS40671.jpg\",\n" +
" \"goods_name\": \"轩辕剑\",\n" +
" \"goods_num\": \"3\",\n" +
" \"goods_price\": \"3.80\"\n" +
" }\n" +
" ],\n" +
" \"store_id\": \"3\",\n" +
" \"store_name\": \"三味书屋\"\n" +
" }\n" +
" ]\n" +
"}";
private List datas;
private Context context;
private ShoppingCarAdapter shoppingCarAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ButterKnife.inject(this);
context = this;
initExpandableListView();
initData();
}
@OnClick({R.id.tv_titlebar_left, R.id.tv_titlebar_right})
public void onViewClicked(View view) {
switch (view.getId()) {
case R.id.tv_titlebar_left://刷新数据
initData();
break;
case R.id.tv_titlebar_right://编辑
String edit = tvTitlebarRight.getText().toString().trim();
if (edit.equals("编辑")) {
tvTitlebarRight.setText("完成");
rlTotalPrice.setVisibility(View.GONE);
btnOrder.setVisibility(View.GONE);
btnDelete.setVisibility(View.VISIBLE);
} else {
tvTitlebarRight.setText("编辑");
rlTotalPrice.setVisibility(View.VISIBLE);
btnOrder.setVisibility(View.VISIBLE);
btnDelete.setVisibility(View.GONE);
}
break;
default:
break;
}
}
/**
* 初始化数据
*/
private void initData() {
//使用Gson解析购物车数据，
//ShoppingCarDataBean为bean类，Gson按照bean类的格式解析数据
/**
* 实际开发中，通过请求后台接口获取购物车数据并解析
*/
Gson gson = new Gson();
ShoppingCarDataBean shoppingCarDataBean = gson.fromJson(shoppingCarData, ShoppingCarDataBean.class);
datas = shoppingCarDataBean.getDatas();
initExpandableListViewData(datas);
}
/**
* 初始化ExpandableListView
* 创建数据适配器adapter，并进行初始化操作
*/
private void initExpandableListView() {
shoppingCarAdapter = new ShoppingCarAdapter(context, llSelectAll, ivSelectAll, btnOrder, btnDelete, rlTotalPrice, tvTotalPrice);
elvShoppingCar.setAdapter(shoppingCarAdapter);
//删除的回调
shoppingCarAdapter.setOnDeleteListener(new ShoppingCarAdapter.OnDeleteListener() {
@Override
public void onDelete() {
initDelete();
/**
* 实际开发中，在此请求删除接口，删除成功后，
* 通过initExpandableListViewData（）方法刷新购物车数据。
* 注：通过bean类中的DatasBean的isSelect_shop属性，判断店铺是否被选中；
* GoodsBean的isSelect属性，判断商品是否被选中，
* （true为选中，false为未选中）
*/
}
});
//修改商品数量的回调
shoppingCarAdapter.setOnChangeCountListener(new ShoppingCarAdapter.OnChangeCountListener() {
@Override
public void onChangeCount(String goods_id) {
/**
* 实际开发中，在此请求修改商品数量的接口，商品数量修改成功后，
* 通过initExpandableListViewData（）方法刷新购物车数据。
*/
}
});
}
/**
* 初始化ExpandableListView的数据
* 并在数据刷新时，页面保持当前位置
*
* @param datas 购物车的数据
*/
private void initExpandableListViewData(List datas) {
if (datas != null && datas.size() > 0) {
//刷新数据时，保持当前位置
shoppingCarAdapter.setData(datas);
//使所有组展开
for (int i = 0; i < shoppingCarAdapter.getGroupCount(); i++) {
elvShoppingCar.expandGroup(i);
}
//使组点击无效果
elvShoppingCar.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
@Override
public boolean onGroupClick(ExpandableListView parent, View v,
int groupPosition, long id) {
return true;
}
});
tvTitlebarRight.setVisibility(View.VISIBLE);
tvTitlebarRight.setText("编辑");
rlNoContant.setVisibility(View.GONE);
elvShoppingCar.setVisibility(View.VISIBLE);
rl.setVisibility(View.VISIBLE);
rlTotalPrice.setVisibility(View.VISIBLE);
btnOrder.setVisibility(View.VISIBLE);
btnDelete.setVisibility(View.GONE);
} else {
tvTitlebarRight.setVisibility(View.GONE);
rlNoContant.setVisibility(View.VISIBLE);
elvShoppingCar.setVisibility(View.GONE);
rl.setVisibility(View.GONE);
}
}
/**
* 判断是否要弹出删除的dialog
* 通过bean类中的DatasBean的isSelect_shop属性，判断店铺是否被选中；
* GoodsBean的isSelect属性，判断商品是否被选中，
*/
private void initDelete() {
//判断是否有店铺或商品被选中
//true为有，则需要刷新数据；反之，则不需要；
boolean hasSelect = false;
//创建临时的List，用于存储没有被选中的购物车数据
List datasTemp = new ArrayList<>();
for (int i = 0; i < datas.size(); i++) {
List goods = datas.get(i).getGoods();
boolean isSelect_shop = datas.get(i).getIsSelect_shop();
if (isSelect_shop) {
hasSelect = true;
//跳出本次循环，继续下次循环。
continue;
} else {
datasTemp.add(datas.get(i));
datasTemp.get(datasTemp.size() - 1).setGoods(new ArrayList());
}
for (int y = 0; y < goods.size(); y++) {
ShoppingCarDataBean.DatasBean.GoodsBean goodsBean = goods.get(y);
boolean isSelect = goodsBean.getIsSelect();
if (isSelect) {
hasSelect = true;
} else {
datasTemp.get(datasTemp.size() - 1).getGoods().add(goodsBean);
}
}
}
if (hasSelect) {
showDeleteDialog(datasTemp);
} else {
ToastUtil.makeText(context, "请选择要删除的商品");
}
}
/**
* 展示删除的dialog（可以自定义弹窗，不用删除即可）
*
* @param datasTemp
*/
private void showDeleteDialog(final List datasTemp) {
View view = View.inflate(context, R.layout.dialog_two_btn, null);
final RoundCornerDialog roundCornerDialog = new RoundCornerDialog(context, 0, 0, view, R.style.RoundCornerDialog);
roundCornerDialog.show();
roundCornerDialog.setCanceledOnTouchOutside(false);// 设置点击屏幕Dialog不消失
roundCornerDialog.setOnKeyListener(keylistener);//设置点击返回键Dialog不消失
TextView tv_message = view.findViewById(R.id.tv_message);
TextView tv_logout_confirm = view.findViewById(R.id.tv_logout_confirm);
TextView tv_logout_cancel = view.findViewById(R.id.tv_logout_cancel);
tv_message.setText("确定要删除商品吗？");
//确定
tv_logout_confirm.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
roundCornerDialog.dismiss();
datas = datasTemp;
initExpandableListViewData(datas);
}
});
//取消
tv_logout_cancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
roundCornerDialog.dismiss();
}
});
}
DialogInterface.OnKeyListener keylistener = new DialogInterface.OnKeyListener() {
public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
return true;
} else {
return false;
}
}
};
}3.使用ExpandableListView,继承BaseExpandableListAdapter
package com.showly.yglin.shoppingcar.adapter;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.bumptech.glide.Glide;
import com.showly.yglin.shoppingcar.R;
import com.showly.yglin.shoppingcar.bean.ShoppingCarDataBean;
import com.showly.yglin.shoppingcar.util.ToastUtil;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;
import butterknife.ButterKnife;
import butterknife.InjectView;
/**
* 购物车的adapter
* 因为使用的是ExpandableListView，所以继承BaseExpandableListAdapter
*/
public class ShoppingCarAdapter extends BaseExpandableListAdapter {
private final Context context;
private final LinearLayout llSelectAll;
private final ImageView ivSelectAll;
private final Button btnOrder;
private final Button btnDelete;
private final RelativeLayout rlTotalPrice;
private final TextView tvTotalPrice;
private List data;
private boolean isSelectAll = false;
private double total_price;
public ShoppingCarAdapter(Context context, LinearLayout llSelectAll,
ImageView ivSelectAll, Button btnOrder, Button btnDelete,
RelativeLayout rlTotalPrice, TextView tvTotalPrice) {
this.context = context;
this.llSelectAll = llSelectAll;
this.ivSelectAll = ivSelectAll;
this.btnOrder = btnOrder;
this.btnDelete = btnDelete;
this.rlTotalPrice = rlTotalPrice;
this.tvTotalPrice = tvTotalPrice;
}
/**
* 自定义设置数据方法；
* 通过notifyDataSetChanged()刷新数据，可保持当前位置
*
* @param data 需要刷新的数据
*/
public void setData(List data) {
this.data = data;
notifyDataSetChanged();
}
@Override
public int getGroupCount() {
if (data != null && data.size() > 0) {
return data.size();
} else {
return 0;
}
}
@Override
public Object getGroup(int groupPosition) {
return data.get(groupPosition);
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(final int groupPosition, final boolean isExpanded, View convertView, ViewGroup parent) {
GroupViewHolder groupViewHolder;
if (convertView == null) {
convertView = View.inflate(context, R.layout.item_shopping_car_group, null);
groupViewHolder = new GroupViewHolder(convertView);
convertView.setTag(groupViewHolder);
} else {
groupViewHolder = (GroupViewHolder) convertView.getTag();
}
final ShoppingCarDataBean.DatasBean datasBean = data.get(groupPosition);
//店铺ID
String store_id = datasBean.getStore_id();
//店铺名称
String store_name = datasBean.getStore_name();
if (store_name != null) {
groupViewHolder.tvStoreName.setText(store_name);
} else {
groupViewHolder.tvStoreName.setText("");
}
//店铺内的商品都选中的时候，店铺的也要选中
for (int i = 0; i < datasBean.getGoods().size(); i++) {
ShoppingCarDataBean.DatasBean.GoodsBean goodsBean = datasBean.getGoods().get(i);
boolean isSelect = goodsBean.getIsSelect();
if (isSelect) {
datasBean.setIsSelect_shop(true);
} else {
datasBean.setIsSelect_shop(false);
break;
}
}
//因为set之后要重新get，所以这一块代码要放到一起执行
//店铺是否在购物车中被选中
final boolean isSelect_shop = datasBean.getIsSelect_shop();
if (isSelect_shop) {
groupViewHolder.ivSelect.setImageResource(R.drawable.xuanze_xuanzhong);
} else {
groupViewHolder.ivSelect.setImageResource(R.drawable.unselect);
}
//店铺选择框的点击事件
groupViewHolder.ll.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
datasBean.setIsSelect_shop(!isSelect_shop);
List goods = datasBean.getGoods();
for (int i = 0; i < goods.size(); i++) {
ShoppingCarDataBean.DatasBean.GoodsBean goodsBean = goods.get(i);
goodsBean.setIsSelect(!isSelect_shop);
}
notifyDataSetChanged();
}
});
//当所有的选择框都是选中的时候，全选也要选中
w:
for (int i = 0; i < data.size(); i++) {
List goods = data.get(i).getGoods();
for (int y = 0; y < goods.size(); y++) {
ShoppingCarDataBean.DatasBean.GoodsBean goodsBean = goods.get(y);
boolean isSelect = goodsBean.getIsSelect();
if (isSelect) {
isSelectAll = true;
} else {
isSelectAll = false;
break w;//根据标记，跳出嵌套循环
}
}
}
if (isSelectAll) {
ivSelectAll.setBackgroundResource(R.drawable.xuanze_xuanzhong);
} else {
ivSelectAll.setBackgroundResource(R.drawable.unselect);
}
//全选的点击事件
llSelectAll.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
isSelectAll = !isSelectAll;
if (isSelectAll) {
for (int i = 0; i < data.size(); i++) {
List goods = data.get(i).getGoods();
for (int y = 0; y < goods.size(); y++) {
ShoppingCarDataBean.DatasBean.GoodsBean goodsBean = goods.get(y);
goodsBean.setIsSelect(true);
}
}
} else {
for (int i = 0; i < data.size(); i++) {
List goods = data.get(i).getGoods();
for (int y = 0; y < goods.size(); y++) {
ShoppingCarDataBean.DatasBean.GoodsBean goodsBean = goods.get(y);
goodsBean.setIsSelect(false);
}
}
}
notifyDataSetChanged();
}
});
//合计的计算
total_price = 0.0;
tvTotalPrice.setText("¥0.00");
for (int i = 0; i < data.size(); i++) {
List goods = data.get(i).getGoods();
for (int y = 0; y < goods.size(); y++) {
ShoppingCarDataBean.DatasBean.GoodsBean goodsBean = goods.get(y);
boolean isSelect = goodsBean.getIsSelect();
if (isSelect) {
String num = goodsBean.getGoods_num();
String price = goodsBean.getGoods_price();
double v = Double.parseDouble(num);
double v1 = Double.parseDouble(price);
total_price = total_price + v * v1;
//让Double类型完整显示，不用科学计数法显示大写字母E
DecimalFormat decimalFormat = new DecimalFormat("0.00");
tvTotalPrice.setText("¥" + decimalFormat.format(total_price));
}
}
}
//去结算的点击事件
btnOrder.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//创建临时的List，用于存储被选中的商品
List temp = new ArrayList<>();
for (int i = 0; i < data.size(); i++) {
List goods = data.get(i).getGoods();
for (int y = 0; y < goods.size(); y++) {
ShoppingCarDataBean.DatasBean.GoodsBean goodsBean = goods.get(y);
boolean isSelect = goodsBean.getIsSelect();
if (isSelect) {
temp.add(goodsBean);
}
}
}
if (temp != null && temp.size() > 0) {//如果有被选中的
/**
* 实际开发中，如果有被选中的商品，
* 则跳转到确认订单页面，完成后续订单流程。
*/
ToastUtil.makeText(context, "跳转到确认订单页面，完成后续订单流程");
} else {
ToastUtil.makeText(context, "请选择要购买的商品");
}
}
});
//删除的点击事件
btnDelete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
/**
* 实际开发中，通过回调请求后台接口实现删除操作
*/
if (mDeleteListener != null) {
mDeleteListener.onDelete();
}
}
});
return convertView;
}
static class GroupViewHolder {
@InjectView(R.id.iv_select)
ImageView ivSelect;
@InjectView(R.id.tv_store_name)
TextView tvStoreName;
@InjectView(R.id.ll)
LinearLayout ll;
GroupViewHolder(View view) {
ButterKnife.inject(this, view);
}
}
//------------------------------------------------------------------------------------------------
@Override
public int getChildrenCount(int groupPosition) {
if (data.get(groupPosition).getGoods() != null && data.get(groupPosition).getGoods().size() > 0) {
return data.get(groupPosition).getGoods().size();
} else {
return 0;
}
}
@Override
public Object getChild(int groupPosition, int childPosition) {
return data.get(groupPosition).getGoods().get(childPosition);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
ChildViewHolder childViewHolder;
if (convertView == null) {
convertView = View.inflate(context, R.layout.item_shopping_car_child, null);
childViewHolder = new ChildViewHolder(convertView);
convertView.setTag(childViewHolder);
} else {
childViewHolder = (ChildViewHolder) convertView.getTag();
}
final ShoppingCarDataBean.DatasBean datasBean = data.get(groupPosition);
//店铺ID
String store_id = datasBean.getStore_id();
//店铺名称
String store_name = datasBean.getStore_name();
//店铺是否在购物车中被选中
final boolean isSelect_shop = datasBean.getIsSelect_shop();
final ShoppingCarDataBean.DatasBean.GoodsBean goodsBean = datasBean.getGoods().get(childPosition);
//商品图片
String goods_image = goodsBean.getGoods_image();
//商品ID
final String goods_id = goodsBean.getGoods_id();
//商品名称
String goods_name = goodsBean.getGoods_name();
//商品价格
String goods_price = goodsBean.getGoods_price();
//商品数量
String goods_num = goodsBean.getGoods_num();
//商品是否被选中
final boolean isSelect = goodsBean.getIsSelect();
Glide.with(context)
.load(R.drawable.img)
.into(childViewHolder.ivPhoto);
if (goods_name != null) {
childViewHolder.tvName.setText(goods_name);
} else {
childViewHolder.tvName.setText("");
}
if (goods_price != null) {
childViewHolder.tvPriceValue.setText(goods_price);
} else {
childViewHolder.tvPriceValue.setText("");
}
if (goods_num != null) {
childViewHolder.tvEditBuyNumber.setText(goods_num);
} else {
childViewHolder.tvEditBuyNumber.setText("");
}
//商品是否被选中
if (isSelect) {
childViewHolder.ivSelect.setImageResource(R.drawable.xuanze_xuanzhong);
} else {
childViewHolder.ivSelect.setImageResource(R.drawable.unselect);
}
//商品选择框的点击事件
childViewHolder.ivSelect.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
goodsBean.setIsSelect(!isSelect);
if (!isSelect == false) {
datasBean.setIsSelect_shop(false);
}
notifyDataSetChanged();
}
});
//加号的点击事件
childViewHolder.ivEditAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//模拟加号操作
String num = goodsBean.getGoods_num();
Integer integer = Integer.valueOf(num);
integer++;
goodsBean.setGoods_num(integer + "");
notifyDataSetChanged();
/**
* 实际开发中，通过回调请求后台接口实现数量的加减
*/
if (mChangeCountListener != null) {
mChangeCountListener.onChangeCount(goods_id);
}
}
});
//减号的点击事件
childViewHolder.ivEditSubtract.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//模拟减号操作
String num = goodsBean.getGoods_num();
Integer integer = Integer.valueOf(num);
if (integer > 1) {
integer--;
goodsBean.setGoods_num(integer + "");
/**
* 实际开发中，通过回调请求后台接口实现数量的加减
*/
if (mChangeCountListener != null) {
mChangeCountListener.onChangeCount(goods_id);
}
} else {
ToastUtil.makeText(context, "商品不能再减少了");
}
notifyDataSetChanged();
}
});
if (childPosition == data.get(groupPosition).getGoods().size() - 1) {
childViewHolder.view.setVisibility(View.GONE);
childViewHolder.viewLast.setVisibility(View.VISIBLE);
} else {
childViewHolder.view.setVisibility(View.VISIBLE);
childViewHolder.viewLast.setVisibility(View.GONE);
}
return convertView;
}
static class ChildViewHolder {
@InjectView(R.id.iv_select)
ImageView ivSelect;
@InjectView(R.id.iv_photo)
ImageView ivPhoto;
@InjectView(R.id.tv_name)
TextView tvName;
@InjectView(R.id.tv_price_key)
TextView tvPriceKey;
@InjectView(R.id.tv_price_value)
TextView tvPriceValue;
@InjectView(R.id.iv_edit_subtract)
ImageView ivEditSubtract;
@InjectView(R.id.tv_edit_buy_number)
TextView tvEditBuyNumber;
@InjectView(R.id.iv_edit_add)
ImageView ivEditAdd;
@InjectView(R.id.view)
View view;
@InjectView(R.id.view_last)
View viewLast;
ChildViewHolder(View view) {
ButterKnife.inject(this, view);
}
}
//-----------------------------------------------------------------------------------------------
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return false;
}
@Override
public boolean hasStableIds() {
return false;
}
//删除的回调
public interface OnDeleteListener {
void onDelete();
}
public void setOnDeleteListener(OnDeleteListener listener) {
mDeleteListener = listener;
}
private OnDeleteListener mDeleteListener;
//修改商品数量的回调
public interface OnChangeCountListener {
void onChangeCount(String goods_id);
}
public void setOnChangeCountListener(OnChangeCountListener listener) {
mChangeCountListener = listener;
}
private OnChangeCountListener mChangeCountListener;
}
4.购物车数据的bean类(ShoppingCarDataBean.class)
package com.showly.yglin.shoppingcar.bean;
import java.util.List;
/**
* 购物车数据的bean类
*/
public class ShoppingCarDataBean {
private int code;
private List datas;
public int getCode() {
return code;
}
public void setCode(int code) {
this.code = code;
}
public List getDatas() {
return datas;
}
public void setDatas(List datas) {
this.datas = datas;
}
public static class DatasBean {
private String store_id;
private String store_name;
private boolean isSelect_shop; //店铺是否在购物车中被选中
private List goods;
public boolean getIsSelect_shop() {
return isSelect_shop;
}
public void setIsSelect_shop(boolean select_shop) {
isSelect_shop = select_shop;
}
public String getStore_id() {
return store_id;
}
public void setStore_id(String store_id) {
this.store_id = store_id;
}
public String getStore_name() {
return store_name;
}
public void setStore_name(String store_name) {
this.store_name = store_name;
}
public List getGoods() {
return goods;
}
public void setGoods(List goods) {
this.goods = goods;
}
public static class GoodsBean {
private String goods_id;
private String goods_image;
private String goods_name;
private String goods_num;
private String goods_price;
private boolean isSelect; //商品是否在购物车中被选中
public boolean getIsSelect() {
return isSelect;
}
public void setIsSelect(boolean isSelect) {
this.isSelect = isSelect;
}
public String getGoods_id() {
return goods_id;
}
public void setGoods_id(String goods_id) {
this.goods_id = goods_id;
}
public String getGoods_image() {
return goods_image;
}
public void setGoods_image(String goods_image) {
this.goods_image = goods_image;
}
public String getGoods_name() {
return goods_name;
}
public void setGoods_name(String goods_name) {
this.goods_name = goods_name;
}
public String getGoods_num() {
return goods_num;
}
public void setGoods_num(String goods_num) {
this.goods_num = goods_num;
}
public String getGoods_price() {
return goods_price;
}
public void setGoods_price(String goods_price) {
this.goods_price = goods_price;
}
}
}
}5.分店铺实现布局
效果图(红色部分)：
在这里插入图片描述
6.购物车中商品Item布局文件
效果图：
在这里插入图片描述
自此，购物车的功能基本已经实现了
以上是“Android如何实现商城购物车功能”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注创新互联行业资讯频道！
本文题目：Android如何实现商城购物车功能
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