Android实现购物车（附demo）

本文主要是介绍Android实现购物车（附demo），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

最近项目也是有涉及到电商部分，就随便写个购物车先熟悉下，效果图：

大致就是这个意思了，实现了：全选，反选，多选删除，数量加减，及这些变化时价格的变化。当然因为是demo，数据的删除就直接remove了。一切从简嘛~

然后上代码：

MainActivity：

package com.xixili.shoppingcartdemo;import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;import com.hongwu.shoppingcartdemo.R;import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Random;public class MainActivity extends Activity implements CartAdapter.RefreshPriceInterface ,View.OnClickListener{private ListView listView;private CheckBox cb_check_all;private TextView tv_total_price;private TextView tv_delete;private TextView tv_go_to_pay;private CartAdapter adapter;private double totalPrice = 0.00;private int totalCount = 0;private List<HashMap<String,String>> goodsList;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initDate();}//控制价格展示private void priceControl(Map<String, Integer> pitchOnMap){totalCount = 0;totalPrice = 0.00;for(int i=0;i<goodsList.size();i++){if(pitchOnMap.get(goodsList.get(i).get("id"))==1){totalCount=totalCount+Integer.valueOf(goodsList.get(i).get("count"));double goodsPrice=Integer.valueOf(goodsList.get(i).get("count"))*Double.valueOf(goodsList.get(i).get("price"));totalPrice=totalPrice+goodsPrice;}}tv_total_price.setText("￥ "+totalPrice);tv_go_to_pay.setText("付款("+totalCount+")");}@Overridepublic void refreshPrice(Map<String, Integer> pitchOnMap) {priceControl(pitchOnMap);}@Overridepublic void onClick(View view) {switch (view.getId()){case R.id.all_chekbox:AllTheSelected();break;case R.id.tv_go_to_pay:if(totalCount<=0){Toast.makeText(this,"请选择要付款的商品~",Toast.LENGTH_SHORT).show();return;}Toast.makeText(this,"钱就是另一回事了~",Toast.LENGTH_SHORT).show();break;case R.id.tv_delete:if(totalCount<=0){Toast.makeText(this,"请选择要删除的商品~",Toast.LENGTH_SHORT).show();return;}checkDelete(adapter.getPitchOnMap());break;}}//删除操作private void checkDelete(Map<String,Integer> map){List<HashMap<String,String>> waitDeleteList=new ArrayList<>();Map<String,Integer> waitDeleteMap =new HashMap<>();for(int i=0;i<goodsList.size();i++){if(map.get(goodsList.get(i).get("id"))==1){waitDeleteList.add(goodsList.get(i));waitDeleteMap.put(goodsList.get(i).get("id"),map.get(goodsList.get(i).get("id")));}}goodsList.removeAll(waitDeleteList);map.remove(waitDeleteMap);priceControl(map);adapter.notifyDataSetChanged();}//全选或反选private void AllTheSelected(){Map<String,Integer> map=adapter.getPitchOnMap();boolean isCheck=false;boolean isUnCheck=false;Iterator iter = map.entrySet().iterator();while (iter.hasNext()) {Map.Entry entry = (Map.Entry) iter.next();if(Integer.valueOf(entry.getValue().toString())==1)isCheck=true;else isUnCheck=true;}if(isCheck==true&&isUnCheck==false){//已经全选,做反选for(int i=0;i<goodsList.size();i++){map.put(goodsList.get(i).get("id"),0);}cb_check_all.setChecked(false);}else if(isCheck==true && isUnCheck==true){//部分选择,做全选for(int i=0;i<goodsList.size();i++){map.put(goodsList.get(i).get("id"),1);}cb_check_all.setChecked(true);}else if(isCheck==false && isUnCheck==true){//一个没选,做全选for(int i=0;i<goodsList.size();i++){map.put(goodsList.get(i).get("id"),1);}cb_check_all.setChecked(true);}priceControl(map);adapter.setPitchOnMap(map);adapter.notifyDataSetChanged();}private void initView(){listView = (ListView) findViewById(R.id.listview);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);tv_go_to_pay.setOnClickListener(this);tv_delete.setOnClickListener(this);cb_check_all.setOnClickListener(this);adapter=new CartAdapter(this,goodsList);adapter.setRefreshPriceInterface(this);listView.setAdapter(adapter);adapter.notifyDataSetChanged();}private void initDate(){goodsList=new ArrayList<>();for(int i=0;i<10;i++){HashMap<String,String> map=new HashMap<>();map.put("id",(new Random().nextInt(10000)%(10000-2900+2900) + 2900)+"");map.put("name","购物车里的第"+(i+1)+"件商品");map.put("type",(i+20)+"码");map.put("price",(new Random().nextInt(100)%(100-29+29) + 29)+"");map.put("count",(new Random().nextInt(10)%(10-1+1) + 1)+"");goodsList.add(map);}initView();}}

CartAdapter:

package com.xixili.shoppingcartdemo;import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;import com.hongwu.shoppingcartdemo.R;import java.util.HashMap;
import java.util.List;
import java.util.Map;/*** Created by lipeng* 2017/6/5.*/public class CartAdapter extends BaseAdapter {private Context context;private List<HashMap<String,String>> dataList;private ViewHolder vh;private Map<String,Integer> pitchOnMap;private RefreshPriceInterface refreshPriceInterface;public CartAdapter(Context context,List<HashMap<String,String>> list){this.context=context;this.dataList=list;pitchOnMap=new HashMap<>();for(int i=0;i<dataList.size();i++){pitchOnMap.put(dataList.get(i).get("id"),0);}}@Overridepublic View getView(final int position, View view, ViewGroup viewGroup) {vh=new ViewHolder();if(view==null){view= LayoutInflater.from(context).inflate(R.layout.item_shopcart_product,null);vh.checkBox=(CheckBox)view.findViewById(R.id.check_box);vh.icon=(ImageView)view.findViewById(R.id.iv_adapter_list_pic);vh.name=(TextView)view.findViewById(R.id.tv_goods_name);vh.price=(TextView)view.findViewById(R.id.tv_goods_price);vh.type=(TextView)view.findViewById(R.id.tv_type_size);vh.num=(TextView)view.findViewById(R.id.tv_num);vh.reduce=(TextView)view.findViewById(R.id.tv_reduce);vh.add=(TextView)view.findViewById(R.id.tv_add);view.setTag(vh);}else {vh=(ViewHolder)view.getTag();}if(dataList.size()>0){if(pitchOnMap.get(dataList.get(position).get("id"))==0)vh.checkBox.setChecked(false);else vh.checkBox.setChecked(true);HashMap<String,String> map=dataList.get(position);vh.name.setText(map.get("name"));vh.num.setText(map.get("count"));vh.type.setText(map.get("type"));vh.price.setText("￥ "+(Double.valueOf(map.get("price")) * Integer.valueOf(map.get("count"))));vh.checkBox.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {final int index=position;if(((CheckBox)view).isChecked())pitchOnMap.put(dataList.get(index).get("id"),1);else pitchOnMap.put(dataList.get(index).get("id"),0);refreshPriceInterface.refreshPrice(pitchOnMap);}});vh.reduce.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {final int index=position;dataList.get(index).put("count",(Integer.valueOf(dataList.get(index).get("count"))-1)+"");if(Integer.valueOf(dataList.get(index).get("count"))<=0){//可提示是否删除该商品,确定就remove,否则就保留1String deID=dataList.get(index).get("id");dataList.remove(index);pitchOnMap.remove(deID);}notifyDataSetChanged();refreshPriceInterface.refreshPrice(pitchOnMap);}});vh.add.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {final int index=position;if(Integer.valueOf(dataList.get(index).get("count"))==15){//15为库存可选择上限Toast.makeText(context,"已达库存上限~",Toast.LENGTH_SHORT).show();return;}dataList.get(index).put("count",(Integer.valueOf(dataList.get(index).get("count"))+1)+"");notifyDataSetChanged();refreshPriceInterface.refreshPrice(pitchOnMap);}});}return view;}public Map<String,Integer> getPitchOnMap(){return pitchOnMap;}public void setPitchOnMap(Map<String,Integer> pitchOnMap){this.pitchOnMap=new HashMap<>();this.pitchOnMap.putAll(pitchOnMap);}public interface RefreshPriceInterface{void refreshPrice(Map<String,Integer> pitchOnMap);}public void setRefreshPriceInterface(RefreshPriceInterface refreshPriceInterface){this.refreshPriceInterface=refreshPriceInterface;}@Overridepublic Object getItem(int i) {return null;}@Overridepublic long getItemId(int i) {return 0;}@Overridepublic int getCount() {if (dataList != null) {return dataList.size();} else {return 0;}}class ViewHolder{CheckBox checkBox;ImageView icon;TextView name,price,num,type,reduce,add;}}

具体就不赘述了，附源码如下：

源码下载

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