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> 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 pitchOnMap){
        totalCount = 0;
        totalPrice = 0.00;
        for(int i=0;i 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 map){
        List> waitDeleteList=new ArrayList<>();
        Map waitDeleteMap =new HashMap<>();
        for(int i=0;i 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();
        for(int i=0;i<10;i++){
            HashMap 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> dataList;
    private ViewHolder vh;
    private Map pitchOnMap;
    private RefreshPriceInterface refreshPriceInterface;

    public CartAdapter(Context context,List> list){
        this.context=context;
        this.dataList=list;

        pitchOnMap=new HashMap<>();
        for(int i=0;i0){

            if(pitchOnMap.get(dataList.get(position).get("id"))==0)vh.checkBox.setChecked(false);
            else vh.checkBox.setChecked(true);
            HashMap 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 getPitchOnMap(){
        return pitchOnMap;
    }
    public void setPitchOnMap(Map pitchOnMap){
        this.pitchOnMap=new HashMap<>();
        this.pitchOnMap.putAll(pitchOnMap);
    }

    public interface RefreshPriceInterface{
        void refreshPrice(Map 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：

源码下载