android端购物车的实现

本人最近工作不忙，所以没事就编写一些常用的demo发到网上，不是很难得技术，但是需要花费时间，需要的朋友可以直接拿来用，而且自己以后在项目中遇到可以直接拿来用。

效果图：

主Activity代码；

package com.example.aidlclicent; import java.util.ArrayList; import java.util.List; import android.os.Bundle; import android.support.v7.app.ActionBarActivity; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.ListView; import android.widget.TextView; public class GoodsActivity extends ActionBarActivity implements OnClickListener, CompoundButton.OnCheckedChangeListener { private List<Product> productList; GoodsAdapter goodsAdapter; private ListView lv; private Button bt_confrim_buy; private TextView sum_goods_price; private CheckBox cb_all_select; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_goods); initView(); initListDate(); } private void initView() { lv = (ListView) findViewById(R.id.listView); bt_confrim_buy = (Button) findViewById(R.id.bt_confrim_buy); sum_goods_price = (TextView) findViewById(R.id.sum_goods_price); cb_all_select = (CheckBox) findViewById(R.id.cb_all_select); cb_all_select.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { if (isChecked) { //清空，原来数据 sum = 0; for (Product product : productList) { product.setSelected(true); goodsAdapter.notifyDataSetChanged(); sum += product.getSumPrice(); } sum_goods_price.setText("￥" + String.valueOf(sum)); } else { for (Product product : productList) { product.setSelected(false); goodsAdapter.notifyDataSetChanged(); // sum =sum- product.getSumPrice(); } // sum_goods_price.setText("￥" + String.valueOf(sum)); sum_goods_price.setText("￥：0"); } } }); } public void confrimBuy(View view) { } private void initListDate() { productList = new ArrayList<>(); for (int i = 0; i < 30; i++) { Product product = new Product(); product.setName("商品" + i + "号"); product.setNum(i); product.setPrice(i + 10); product.setSumPrice(i * (i + 10)); productList.add(product); } goodsAdapter = new GoodsAdapter(this, productList); lv.setAdapter(goodsAdapter); goodsAdapter.setOnAddNum(this); goodsAdapter.setOnsunNum(this); goodsAdapter.setOnCheckedSelect(this); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.goods, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } @Override public void onClick(View v) { Object tag = v.getTag(); switch (v.getId()) { // + case R.id.item_btn_add: int position = (Integer) tag; int num = productList.get(position).getNum(); int price = productList.get(position).getPrice(); num++; int sum = price * num; productList.get(position).setNum(num); productList.get(position).setSumPrice(sum); goodsAdapter.notifyDataSetChanged(); updateSumPrice(position, price, 1); break; // - case R.id.item_btn_sub: int price1 = 0; int position1 = (Integer) tag; int num1 = productList.get(position1).getNum(); if (num1 > 0) { num1--; price1 = productList.get(position1).getPrice(); int sum1 = price1 * num1; productList.get(position1).setSumPrice(sum1); updateSumPrice(position1, price1, 0); } productList.get(position1).setNum(num1); goodsAdapter.notifyDataSetChanged(); break; default: break; } } private void updateSumPrice(int position, int price1, int add) { boolean isSelected = productList.get(position).isSelected(); if (isSelected && add == 1) { sum = sum + price1; sum_goods_price.setText("￥" + String.valueOf(sum)); } else if (isSelected && add == 0) { sum = sum - price1; sum_goods_price.setText("￥" + String.valueOf(sum)); } } int sum = 0; @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { int position = 0; if (buttonView.getTag() != null) { position = (int) buttonView.getTag(); } else { return; } boolean isSelected = productList.get(position).isSelected(); if (isChecked && !isSelected) { sum += productList.get(position).getSumPrice(); productList.get(position).setSelected(true); } else if (!isChecked && isSelected) { sum = sum - productList.get(position).getSumPrice(); productList.get(position).setSelected(false); } sum_goods_price.setText("￥" + String.valueOf(sum)); } } 适配器GoodsAdapter.java类

package com.example.aidlclicent; import java.util.List; 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.CompoundButton.OnCheckedChangeListener; import android.widget.ImageButton; import android.widget.TextView; public class GoodsAdapter extends BaseAdapter { // 集合 ，存放ListView的商品实体类数据 private List<Product> products; Context context; private View.OnClickListener addNum; private View.OnClickListener subNum; private OnCheckedChangeListener selectCheck; public void setOnAddNum(View.OnClickListener addNum) { this.addNum = addNum; } public void setOnsunNum(View.OnClickListener subNum) { this.subNum = subNum; } public void setOnCheckedSelect(OnCheckedChangeListener select) { this.selectCheck = select; } public GoodsAdapter(Context context,List<Product> products) { super(); this.context = context; this.products = products; } @Override public int getCount() { int ret = 0; if(products!= null){ ret = products.size(); } return ret; } @Override public Object getItem(int position) { return products.get(position); } @Override public long getItemId(int arg0) { return arg0; } @Override public View getView(int position, View arg1, ViewGroup arg2) { View v =null; if(v!=null){ v=arg1; }else{ v = LayoutInflater.from(context).inflate(R.layout.goods_item,arg2,false); } ViewHolder viewHolder = (ViewHolder) v.getTag(); if(viewHolder == null){ viewHolder = new ViewHolder(); viewHolder.item_btn_add = (ImageButton) v.findViewById(R.id.item_btn_add); viewHolder.item_btn_sub = (ImageButton) v.findViewById(R.id.item_btn_sub); viewHolder.item_product_name = (TextView) v.findViewById(R.id.item_product_name); viewHolder.item_product_num = (TextView) v.findViewById(R.id.item_product_num); viewHolder.item_product_price = (TextView) v.findViewById(R.id.item_product_price); viewHolder.item_priduct_sumPrice = (TextView) v.findViewById(R.id.sum_price); viewHolder.cb_select = (CheckBox) v.findViewById(R.id.cb_select); viewHolder.item_btn_add .setOnClickListener(addNum); viewHolder.item_btn_sub.setOnClickListener(subNum); viewHolder.cb_select.setOnCheckedChangeListener(selectCheck); v.setTag(viewHolder); } viewHolder.item_product_name.setText(products.get(position).getName()); viewHolder.item_product_num.setText(String.valueOf(products.get(position).getNum())); viewHolder.item_product_price.setText(String.valueOf(products.get(position).getPrice())); viewHolder.item_priduct_sumPrice.setText("￥"+String.valueOf(products.get(position).getSumPrice())); boolean isSelected = products.get(position).isSelected(); if(isSelected){ viewHolder.cb_select.setChecked(true); }else if(!isSelected){ viewHolder.cb_select.setChecked(false);; } viewHolder.item_btn_add.setTag(position); viewHolder.item_btn_sub.setTag(position); viewHolder.cb_select.setTag(position); return v; } private static class ViewHolder{ //商品名称，数量，总价 private TextView item_product_name; private TextView item_product_num; private TextView item_product_price; //增减商品数量按钮 private ImageButton item_btn_add; private ImageButton item_btn_sub; private TextView item_priduct_sumPrice; private CheckBox cb_select; } } godds.xml代码： <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context="com.auto.app.ui.MainActivity" > <TextView android:id="@+id/item_product_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="20sp" android:layout_margin="10dp" android:text="商品名称" android:textColor="#000" /> <ImageButton android:id="@+id/item_btn_add" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#0000" android:src="@drawable/ic_launcher" android:layout_below="@+id/item_product_name" android:layout_marginLeft="10dp" /> <TextView android:id="@+id/item_product_num" android:text="1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="25sp" android:textColor="#000" android:layout_margin="5dp" android:layout_toRightOf="@id/item_btn_add" android:layout_below="@id/item_product_name" /> <ImageButton android:id="@+id/item_btn_sub" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#0000" android:src="@drawable/ic_launcher" android:layout_below="@id/item_product_name" android:layout_toRightOf="@id/item_product_num" /> <TextView android:id="@+id/item_product_price" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="20sp" android:layout_margin="10dp" android:text="0" android:textColor="#000" android:layout_alignParentRight="true" /> <TextView android:id="@+id/sum_price" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/item_product_num" android:layout_alignBottom="@+id/item_product_num" android:layout_alignParentRight="true" android:text="￥200" /> <CheckBox android:id="@+id/cb_select" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/item_product_name" android:layout_alignBottom="@+id/item_product_name" android:layout_alignRight="@+id/item_btn_sub" /> </RelativeLayout> 需要源码的同学请点击地址： http://download.csdn.net/detail/bighua_mm/9603420