Android购物车的实现（升级版仿淘宝）

前面有篇文章实现了Android 简单的购物车这篇实现了购物车中商品按照店铺分类显示的也就是淘宝购物车的显示方式。
主要代码
package com.jock.shopcart;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.Activity;import android.app.AlertDialog;import android.content.Context;import android.content.DialogInterface;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.Window;import android.widget.CheckBox;import android.widget.ExpandableListView;import android.widget.TextView;import android.widget.Toast;import com.jock.adapter.ShopcartExpandableListViewAdapter;import com.jock.adapter.ShopcartExpandableListViewAdapter.CheckInterface;import com.jock.adapter.ShopcartExpandableListViewAdapter.ModifyCountInterface;import com.jock.entity.GroupInfo;import com.jock.entity.ProductInfo;import com.jock.shopcar.R;public class MainActivity extends Activity implements CheckInterface, ModifyCountInterface, OnClickListener{private ExpandableListView exListView;private CheckBox cb_check_all;private TextView tv_total_price;private TextView tv_delete;private TextView tv_go_to_pay;private Context context;private double totalPrice = 0.00;// 购买的商品总价private int totalCount = 0;// 购买的商品总数量private ShopcartExpandableListViewAdapter selva;private List groups = new ArrayList();// 组元素数据列表private Map> children = new HashMap>();// 子元素数据列表@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_main);initView();initEvents();}private void initView(){context = this;virtualData();exListView = (ExpandableListView) findViewById(R.id.exListView);cb_check_all = (CheckBox) findViewById(R.id.all_chekbox);tv_total_price = (TextView) findViewById(R.id.tv_total_price);tv_delete = (TextView) findViewById(R.id.tv_delete);tv_go_to_pay = (TextView) findViewById(R.id.tv_go_to_pay);}private void initEvents(){selva = new ShopcartExpandableListViewAdapter(groups, children, this);selva.setCheckInterface(this);// 关键步骤1,设置复选框接口selva.setModifyCountInterface(this);// 关键步骤2,设置数量增减接口exListView.setAdapter(selva);for (int i = 0; i < selva.getGroupCount(); i++){exListView.expandGroup(i);// 关键步骤3,初始化时，将ExpandableListView以展开的方式呈现}cb_check_all.setOnClickListener(this);tv_delete.setOnClickListener(this);tv_go_to_pay.setOnClickListener(this);}/** * 模拟数据
 * 遵循适配器的数据列表填充原则，组元素被放在一个List中，对应的组元素下辖的子元素被放在Map中，
 * 其键是组元素的Id(通常是一个唯一指定组元素身份的值) */private void virtualData(){for (int i = 0; i < 6; i++){groups.add(new GroupInfo(i + "", "第八号当铺" + (i + 1) + "号店"));List products = new ArrayList();for (int j = 0; j <= i; j++){products.add(new ProductInfo(j + "", "商品", "", groups.get(i).getName() + "的第" + (j + 1) + "个商品", 120.00 + i * j, 1));}children.put(groups.get(i).getId(), products);// 将组元素的一个唯一值，这里取Id，作为子元素List的Key}}@Overridepublic void onClick(View v){AlertDialog alert;switch (v.getId()){case R.id.all_chekbox:doCheckAll();break;case R.id.tv_go_to_pay:if (totalCount == 0){Toast.makeText(context, "请选择要支付的商品", Toast.LENGTH_LONG).show();return;}alert = new AlertDialog.Builder(context).create();alert.setTitle("操作提示");alert.setMessage("总计:\n" + totalCount + "种商品\n" + totalPrice + "元");alert.setButton(DialogInterface.BUTTON_NEGATIVE, "取消", new DialogInterface.OnClickListener(){@Overridepublic void onClick(DialogInterface dialog, int which){return;}});alert.setButton(DialogInterface.BUTTON_POSITIVE, "确定", new DialogInterface.OnClickListener(){@Overridepublic void onClick(DialogInterface dialog, int which){return;}});alert.show();break;case R.id.tv_delete:if (totalCount == 0){Toast.makeText(context, "请选择要移除的商品", Toast.LENGTH_LONG).show();return;}alert = new AlertDialog.Builder(context).create();alert.setTitle("操作提示");alert.setMessage("您确定要将这些商品从购物车中移除吗？");alert.setButton(DialogInterface.BUTTON_NEGATIVE, "取消", new DialogInterface.OnClickListener(){@Overridepublic void onClick(DialogInterface dialog, int which){return;}});alert.setButton(DialogInterface.BUTTON_POSITIVE, "确定", new DialogInterface.OnClickListener(){@Overridepublic void onClick(DialogInterface dialog, int which){doDelete();}});alert.show();break;}}/** * 删除操作
 * 1.不要边遍历边删除，容易出现数组越界的情况
 * 2.现将要删除的对象放进相应的列表容器中，待遍历完后，以removeAll的方式进行删除 */protected void doDelete(){List toBeDeleteGroups = new ArrayList();// 待删除的组元素列表for (int i = 0; i < groups.size(); i++){GroupInfo group = groups.get(i);if (group.isChoosed()){toBeDeleteGroups.add(group);}List toBeDeleteProducts = new ArrayList();// 待删除的子元素列表List childs = children.get(group.getId());for (int j = 0; j < childs.size(); j++){if (childs.get(j).isChoosed()){toBeDeleteProducts.add(childs.get(j));}}childs.removeAll(toBeDeleteProducts);}groups.removeAll(toBeDeleteGroups);selva.notifyDataSetChanged();calculate();}@Overridepublic void doIncrease(int groupPosition, int childPosition, View showCountView, boolean isChecked){ProductInfo product = (ProductInfo) selva.getChild(groupPosition, childPosition);int currentCount = product.getCount();currentCount++;product.setCount(currentCount);((TextView) showCountView).setText(currentCount + "");selva.notifyDataSetChanged();calculate();}@Overridepublic void doDecrease(int groupPosition, int childPosition, View showCountView, boolean isChecked){ProductInfo product = (ProductInfo) selva.getChild(groupPosition, childPosition);int currentCount = product.getCount();if (currentCount == 1)return;currentCount--;product.setCount(currentCount);((TextView) showCountView).setText(currentCount + "");selva.notifyDataSetChanged();calculate();}@Overridepublic void checkGroup(int groupPosition, boolean isChecked){GroupInfo group = groups.get(groupPosition);List childs = children.get(group.getId());for (int i = 0; i < childs.size(); i++){childs.get(i).setChoosed(isChecked);}if (isAllCheck())cb_check_all.setChecked(true);elsecb_check_all.setChecked(false);selva.notifyDataSetChanged();calculate();}@Overridepublic void checkChild(int groupPosition, int childPosiTion, boolean isChecked){boolean allChildSameState = true;// 判断改组下面的所有子元素是否是同一种状态GroupInfo group = groups.get(groupPosition);List childs = children.get(group.getId());for (int i = 0; i < childs.size(); i++){if (childs.get(i).isChoosed() != isChecked){allChildSameState = false;break;}}if (allChildSameState){group.setChoosed(isChecked);// 如果所有子元素状态相同，那么对应的组元素被设为这种统一状态} else{group.setChoosed(false);// 否则，组元素一律设置为未选中状态}if (isAllCheck())cb_check_all.setChecked(true);elsecb_check_all.setChecked(false);selva.notifyDataSetChanged();calculate();}private boolean isAllCheck(){for (GroupInfo group : groups){if (!group.isChoosed())return false;}return true;}/** 全选与反选 */private void doCheckAll(){for (int i = 0; i < groups.size(); i++){groups.get(i).setChoosed(cb_check_all.isChecked());GroupInfo group = groups.get(i);List childs = children.get(group.getId());for (int j = 0; j < childs.size(); j++){childs.get(j).setChoosed(cb_check_all.isChecked());}}selva.notifyDataSetChanged();}/** * 统计操作
 * 1.先清空全局计数器
 * 2.遍历所有子元素，只要是被选中状态的，就进行相关的计算操作
 * 3.给底部的textView进行数据填充 */private void calculate(){totalCount = 0;totalPrice = 0.00;for (int i = 0; i < groups.size(); i++){GroupInfo group = groups.get(i);List childs = children.get(group.getId());for (int j = 0; j < childs.size(); j++){ProductInfo product = childs.get(j);if (product.isChoosed()){totalCount++;totalPrice += product.getPrice() * product.getCount();}}}tv_total_price.setText("￥" + totalPrice);tv_go_to_pay.setText("去支付(" + totalCount + ")");}}
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