Android实现购物车（附demo）

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;    @Override    protected 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+")");    }    @Override    public void refreshPrice(Map<String, Integer> pitchOnMap) {        priceControl(pitchOnMap);    }    @Override    public 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);        }    }    @Override    public 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() {                @Override                public 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() {                @Override                public 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1                        String deID=dataList.get(index).get("id");                        dataList.remove(index);                        pitchOnMap.remove(deID);                    }                    notifyDataSetChanged();                    refreshPriceInterface.refreshPrice(pitchOnMap);                }            });            vh.add.setOnClickListener(new View.OnClickListener() {                @Override                public 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;    }    @Override    public Object getItem(int i) {        return null;    }    @Override    public long getItemId(int i) {        return 0;    }    @Override    public 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：

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