商城管理系统

 

 

 

 

 

 

 

 

 

 

 

题    目 商城管理系统设计与实现   

系    别 信息与控制工程系         

专    业 计算机科学与技术         

班    级 1701                     

学    号 173030112                

姓    名 李亚楠                   

 

1. 基于Android的商城管理系统设计与实现

1.1 系统需求分析

1.1.1 用例分析

用例图如1.1所示

 

图1.1 商城用例图

 

 

 

 

 

 

 

 

 

1.1.2 数据逻辑模型

商城管理系统ER图如图1.2所示

 

 

 

 

                       n

 

 

 

                 n                                                n

 

                           1                          1   

 

 

             n

 

 

 

 

 

 

 

图1.2 商城管理系统E-R图

1.2 系统整体设计

 

图1.3 商城管理功能图

 

  在互联网迅猛发展的时代，网上购物已经成为许多人平常生活的一部分，足不出户，即可得天下万物。而在移动平台技术日益成熟的现在，在移动平台上实现网上购物功能更是将来的趋势，时代的潮流。
　　为了在Android平台上实现移动商城系统，本文以基于Linux的开放源代码操做系统Android为研究对象，进行实际的开发工做。主要任务包括三个方面:第一，在Android系统上开发一款功能强大，可维护性好，用户友好的手机客户端软件;第二，开发一款能有效支持移动平台应用的，稳定，高效的服务端后台系统;第三，寻求一种可以有效的解决移动平台与服务器之间数据交互，同时下降系统消耗的数据传输途径。
　　论文从项目的背景出发，介绍了基于Android的移动商城系统的开发过程和研究价值，探讨了如何将各项先进技术融入项目的开发过程当中。本文以本系统的部分后台开发，前台客户端相关功能的实现，以及先后台之间数据传输的开发过程为例，详细的描述了移动商城系统的设计和实现的过程，同时从系统开发的需求分析，详细设计到最终的测试等多个方面对系统进行了全方位的描述，并探讨了下一步的改进计划。

 

1.3 系统数据库设计

根据前面E-R图设计出实现系统功能所须要的数据库表的结构，并以表格的形式列出每个数据库表的表结构，即字段名、类型、长度、小数位数、是否主键、索引、是否容许为空、说明等。并介绍表与表之间的逻辑关系。如表3.1所示：

表3.1  user

字段名	数据类型	长度	主键	索引	外键	可空
rowid	text	11	是		否	否
userid	int	50	否		否	否
password	text	50	否		否	否

 

表3.2  goods

字段名	数据类型	长度	主键	索引	外键	可空
rowid	text	11	是		否	否
shopname	text	20	否		否	否
shopintro	text	50	否		否	否
shopprice	int	10	否		否	否
shopnum	int	Unknow	否		否	否
shopdeller	text	30	否		否	否

 

表3.3  buyer_goods(部门表)

字段名	数据类型	长度	主键	索引	外键	可空
rowid	int	11	是		否	否
id	int	20	否		否	否
buyerid	int	50	否		否	否
buyershopnum	text	50	否		否	否
shopname	text	50	否		否	否

 

1.4 系统详细设计

1.4.1 商家模块

表3.4 商家模块

编号	输入	处理	输出
1	用户名和密码	根据输入用户名从数据库中找一个同名的用户而且进行密码比对	成功则跳转到添加商品，失败就转到登陆页面
2	用户名和密码	向数据库中插入一个新的商家用户	成功则提示失败则转到添加页面

 

1.4.2 顾客模块

表3.10 部门管理模块

编号	输入	处理	输出
1	用户名和密码	向数据库中插入一个新的顾客用户	成功则提示失败则转到添加页面
2	充值	输入充值金额	成功则提示充值成功
3	购买	点击要购买商品	成功点击已购商品显示购买的商品则购买成功

 

 

1.4.3 登陆设计

界面设计的时候用了toast提示，而后用intent切换页面。登陆注册页面以下图3.4 所示

 

 

图3.4 登陆注册页面图

1.5 系统实现

1.5.1 注册模块

注册包括商家注册和顾客注册。

1.5.1.1 顾客注册

顾客注册包括输入帐号，输入密码，输入充值金额以后点顾客，最后点击注册。

 

 

1.5.1.2 商家注册

商家注册包括输入帐号，输入密码，输入充值金额以后点商家，最后点击注册。

 

顾客和商家注册代码以下：

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_register);

try {

// 打开数据库，若是数据库不存在则建立数据库

mSQLiteDatabase = this.openOrCreateDatabase(DATABASE_NAME,

Activity.MODE_PRIVATE, null);

} catch (Exception ex) {

Toast.makeText(this, "打开或建立数据库异常:" + ex.getMessage(), 2000).show();

}

edt_userid = (EditText)this.findViewById(R.id.edt_userid);

edt_userpwd = (EditText)this.findViewById(R.id.edt_userpwd);

edt_usermoney= (EditText)this.findViewById(R.id.edt_usermoney);

Button bt3 = (Button) findViewById(R.id.button3);

bt3.setOnClickListener(new OnClickListener() {

 

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

ShopregActivity.this.finish();

}

});

Button button_register = (Button) this.findViewById(R.id.button_register);

button_register.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

String userid = edt_userid.getText().toString();

String userpwd = edt_userpwd.getText().toString();

int usermoney=Integer.parseInt(edt_usermoney.getText().toString());

RadioButton radio_buyer =(RadioButton) findViewById(R.id.radio_buyer);

String type = "seller";

if(radio_buyer.isChecked()){

type = "buyer";

}

try{

 

   mSQLiteDatabase.execSQL("insert into user values('"+userid+"','"+userpwd+"','"+usermoney+"','"+type+"')");

   Toast.makeText(ShopregActivity.this, "注册成功!", 2000).show();

}catch(Exception e){

   Toast.makeText(ShopregActivity.this, "新增用户失败:" + e.getMessage(), 2000).show();

}

}

});

}

 

1.5.2 商家登陆模块

添加商品的名称价格数量，以后点击发布商品。

 

 

商家发布商品代码： @Override

public void onClick(View v) {

// TODO Auto-generated method stub

String shopname = edit_shopname.getText().toString();

String shopintro = edit_shopintro.getText().toString();

int shopprice = Integer.parseInt(edit_shopprice.getText()

.toString());

int shopnum = Integer.parseInt(edit_shopnum.getText()

.toString());

String sql = "insert into goods values('" + shopname + "','"

+ shopintro + "',"+shopprice + "," + shopnum + ",'" + userId + "')";

try {

// 打开数据库，若是数据库不存在则建立数据库

mSQLiteDatabase = openOrCreateDatabase(DATABASE_NAME,

Activity.MODE_PRIVATE, null);

mSQLiteDatabase.execSQL(sql);

Toast.makeText(ShopAddsActivity.this, "添加商品成功!",

1000).show();

Intent i = new Intent(ShopAddsActivity.this,

null);//SellerCheckShopActivity.class

 Bundle b = new Bundle();

 b.putString("user", userId);

i.putExtra("data", b);

startActivity(i);

} catch (Exception e) {

Toast.makeText(ShopAddsActivity.this,

"添加商品异常!" + e.getMessage(), 1000).show();

}

}

});

 

}

1.5.3 用户登陆模块

主要能够查看商家发布的商品名称，本身的余额，若是余额不足能够输入充值金额而后点击充值按钮进行充值。

 

购买商品代码实现：public void onClick(View v) {

// TODO Auto-generated method stub

String shopname = tv.getText().toString();

 buy_shopnum=Integer.parseInt(edt_buy_shopnum.getText().toString());

int price=Integer.parseInt(shopprice);

int total_price=buy_shopnum*price;

try {

 String a="select usermoney from user  where userid='"+userId+"' " ;

Cursor cursor = mSQLiteDatabase.rawQuery(a, null);

while (cursor.moveToNext()) {

 buyermoney= cursor.getInt(cursor.getColumnIndex("usermoney"));

 

}

 

 

if(buyermoney>=total_price){

 

String sql = "update goods set shopnum=shopnum-"+buy_shopnum+" where shopname='"+shopname+"' " ;

mSQLiteDatabase.execSQL(sql);

sql="update user set usermoney=usermoney-"+total_price+" where userid='"+userId+"'";

mSQLiteDatabase.execSQL(sql);

 sql = "insert into buyer_goods(buyerid,shopname,buyshopnum) values('" + userId + "','"

+ shopname + "','"+buy_shopnum+"')";

mSQLiteDatabase.execSQL(sql);

 

Toast.makeText(ShopbSelectActivity.this, "购买成功!",

1000).show();

Intent i = new Intent(ShopbSelectActivity.this,

ShopbSelectActivity.class);

 Bundle b = new Bundle();

 b.putString("user", userId);

i.putExtra("data", b);

startActivity(i);

}

else {Toast.makeText(ShopbSelectActivity.this, "余额不足，请充值!",

3000).show();}

} catch (Exception e) {

Toast.makeText(ShopbSelectActivity.this,

"添加商品异常!" + e.getMessage(), 1000).show();

}

 

}

});

 

充值代码实现：

btn_myshop.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

Intent i = new Intent(ShopbSelectActivity.this,

ShopbuyerActivity.class);

 Bundle b = new Bundle();       //发送数据

 b.putString("user", userId);

i.putExtra("data", b);

startActivity(i);

}

});

edt_addmoney=(EditText)this.findViewById(R.id.edittext_addmoney);

btn_addmoney=  (Button)this.findViewById(R.id.button_addmoney);

btn_addmoney.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

String addmoney=edt_addmoney.getText().toString();

String sql = "update user set usermoney=usermoney+"+addmoney+"  where userid='"+userId+"' " ;

mSQLiteDatabase.execSQL(sql);

Toast.makeText(ShopbSelectActivity.this, "成功充值"+addmoney+"元!",

1000).show();

Intent i = new Intent(ShopbSelectActivity.this,

ShopbSelectActivity.class);

 Bundle b = new Bundle();

 b.putString("user", userId);

i.putExtra("data", b);

startActivity(i);

}

});

1.5.3.1 查看已购商品

点击查看已购商品，页面跳转到已购商品的页面，页面显示你当前的余额和你所购买的商品名称，商品单价，购买商品数量和你购买时商家的名称。点击返回按钮能够返回到前一个页面。

 

查看已购商品代码实现：

private void selectData() {

String sql = "select g.shopname,g.shopprice,bd.buyshopnum,g.shopseller from buyer_goods as bd,goods as g where bd.buyerid='"

+ userId + "' and bd.shopname=g.shopname";

Cursor cursor = mSQLiteDatabase.rawQuery(sql, null);

if (cursor != null) {

// 定义存储查询结果的List，每一行数据类型为Map<String, Object>，其中String表明列名，Object为值

List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();

Map<String, Object> map;

// 遍历游标对象，每一行获取的数据存放到Map<String, Object>类型的变量map中

while (cursor.moveToNext()) {

map = new HashMap<String, Object>();

map.put("shopname", cursor.getString(cursor.getColumnIndex("shopname")));

map.put("shopprice", cursor.getInt(cursor.getColumnIndex("shopprice")));

map.put("buyshopnum", cursor.getInt(cursor.getColumnIndex("buyshopnum")));

map.put("shopseller", cursor.getString(cursor.getColumnIndex("shopseller")));

list.add(map);

}

// 建立Adapter，并于ListView绑定

SimpleAdapter adapter = new SimpleAdapter(this, list, R.layout.buyer_myshop,

new String[] { "shopname", "shopprice", "buyshopnum", "shopseller" },

new int[] { R.id.tv_buyer_myshopname, R.id.tv_buyer_myshopprice, R.id.tv_buyer_myshopnum,

R.id.tv_buyer_mysellername });

lv1.setAdapter(adapter);

}

}

 

private void selectBuyermoney() {

String sql = "select usermoney from user where userid='" + userId + "'";

// 得到查询结果对应的游标对象

Cursor cursor = mSQLiteDatabase.rawQuery(sql, null);

if (cursor != null) {

// 定义存储查询结果的List，每一行数据类型为Map<String, Object>，其中String表明列名，Object为值

List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();

Map<String, Object> map;

while (cursor.moveToNext()) {

map = new HashMap<String, Object>();

map.put("usermoney", cursor.getInt(cursor.getColumnIndex("usermoney")));

list.add(map);

}

// 建立Adapter，并于ListView绑定

SimpleAdapter adapter = new SimpleAdapter(this, list, R.layout.buyer_money2, new String[] { "usermoney" },

new int[] { R.id.tv_buyer_money2 });

lv2.setAdapter(adapter);

 

}

 

}

1.6 系统测试

本次实习所用的开发环境为

开发技术：android

数据库：sqlLite

开发工具：eclipse

1.6.1 项目测试 

1、测试登陆功能

2、测试注册功能

3、测试添加商品功能

四、测试用户购买充值功能

5、测试查已购商品功能

1.6.2 测试结果

 

 

 

 

 

 

 

以上截图测试了本系统的大部分功能，而且成功实现了每一个功能。

 

2. 课程设计总结

本次课程设计，让我受益不浅，此次的课程设计把本身学的java集合利用上去了，很是开心。还有就是虽然上课听老师讲课，可是本身学完作作做业以后就没再看过，如今不少知识都忘记了，经过此次的课程设计我回忆了一遍android的基础东西，并且把java知识复习了，经过此次的android课程设计让我更加了解了这门学科，让本身更有兴趣的去学习这门学科，让我感受很是开心。

而后就是经过此次的课程设计我感受到了写代码须要很是严谨，在此次的课程设计中我深有体会，尤为是调用layout中的 控件，在我感受若是写的不严谨在你调用这个控件时就很是的困难，因此咱们在课程设计须要把每一个控件的ID设置严谨一点，这样咱们才能轻松地调用这个控件，还有就是不能有一点错误，否则整个程序就会不能顺利地运行，还有一点就是须要作到不懂就问的习惯，让老师同窗帮助一下这样的话，让你在写代码将会更加的流畅，还有一点就是不论遇到什么困难和难题都须要咱们的坚持，在坚持以后咱们必定可以成功完成。总之，在此次的课程设计当中我学习到了不少知识，让我也巩固了一下书本上的知识，这次的课程设计在我学习生涯上起到了相当重要的一步。

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

附录：

         商城购物系统的实现

使用技术：

UI设计：创建了5个界面

数据库使用：运用sqlLite数据库创建了3个表分别是用户信息表、商品表和用户购买商品表。

Activity组件的应用：运用了Activity组件实现了登陆界面的跳转功能和

查看已购商品的跳转界面。

ListView的使用：使用了2个listview实现了商家添加商品的显示和查看用户已购商品的显示。     

UML类图：

 

 

代码：

清单文件：

/ShopCenter/src/com/example/shopcenter/MainActivity.java

/ShopCenter/src/com/example/shopcenter/ShopAddsActivity.java

/ShopCenter/src/com/example/shopcenter/ShopbSelectActivity.java

/ShopCenter/src/com/example/shopcenter/ShopbuyerActivity.java

/ShopCenter/src/com/example/shopcenter/ShopregActivity.java

/ShopCenter/res/layout/activity_buyer_check_shop.xml

/ShopCenter/res/layout/activity_buyer_select_shop.xml

/ShopCenter/res/layout/activity_main.xml

/ShopCenter/res/layout/activity_register.xml

/ShopCenter/res/layout/activity_seller_add_shop.xml

/ShopCenter/res/layout/buyer_money.xml

/ShopCenter/res/layout/buyer_money2.xml

/ShopCenter/res/layout/buyer_myshop.xml

/ShopCenter/res/layout/buyer_shop.xml

/ShopCenter/res/layout/shop_buyer.xml

布局文件：

截图：

 

 

/ShopCenter/res/layout/activity_buyer_check_shop.xml

/ShopCenter/res/layout/activity_buyer_select_shop.xml

/ShopCenter/res/layout/activity_main.xml

/ShopCenter/res/layout/activity_register.xml

/ShopCenter/res/layout/activity_seller_add_shop.xml

/ShopCenter/res/layout/buyer_money.xml

/ShopCenter/res/layout/buyer_money2.xml

/ShopCenter/res/layout/buyer_myshop.xml

/ShopCenter/res/layout/buyer_shop.xml

/ShopCenter/res/layout/shop_buyer.xml

Java原代码：

主界面

package com.example.shopcenter;

 

import android.os.Bundle;

import android.app.Activity;

import android.content.Intent;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

 

public class MainActivity extends Activity {

//定义用于访问SQLite的对象

private SQLiteDatabase mSQLiteDatabase = null;

//数据库名称

private static final String DATABASE_NAME = "test.db";

private static final String CREATE_TABLE_USER="create table if not exists user(userid text primary key,userpwd text,usermoney  integer ,usertype text)";

private static final String CREATE_TABLE_GOODS="create table if not exists goods(shopname text primary key,shopintro text,shopprice integer,shopnum integer,shopseller text)";

private static final String CREATE_TABLE_BUYER_GOODS="create table if not exists buyer_goods(id integer primary key autoincrement,buyerid text,shopname text,buyshopnum integer)";

private EditText edt_login_userid,edt_login_userpwd;

 

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

try {

// 打开数据库，若是数据库不存在则建立数据库

mSQLiteDatabase = this.openOrCreateDatabase(DATABASE_NAME,

Activity.MODE_PRIVATE, null);

} catch (Exception ex) {

Toast.makeText(this, "打开或建立数据库异常:" + ex.getMessage(), 2000).show();

}

try {

mSQLiteDatabase.execSQL(CREATE_TABLE_USER);

mSQLiteDatabase.execSQL(CREATE_TABLE_GOODS);

mSQLiteDatabase.execSQL(CREATE_TABLE_BUYER_GOODS);

} catch (Exception ex) {

Toast.makeText(this, "建立用户表异常:" + ex.getMessage(), 2000).show();

}

Button goto_register = (Button) this.findViewById(R.id.button_goto_register);

goto_register.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

Intent i = new Intent(MainActivity.this,ShopregActivity.class);

startActivity(i);

}

});

edt_login_userid = (EditText)this.findViewById(R.id.edt_login_userid);

edt_login_userpwd = (EditText)this.findViewById(R.id.edt_login_userpwd);

Button user_login = (Button) this.findViewById(R.id.button_login);

user_login.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

String login_userid = edt_login_userid.getText().toString();

String login_userpwd = edt_login_userpwd.getText().toString();

try{

 String sql = "select * from user where userid='"+login_userid+"' and userpwd='"+login_userpwd+"'";

  Cursor cursor =  mSQLiteDatabase.rawQuery(sql,null);

  if(cursor.moveToNext()){

  String type = cursor.getString(cursor.getColumnIndex("usertype"));

  Bundle b = new Bundle();

 

  b.putString("user", login_userid);

  

  if(type.equals("seller")){

Intent i = new Intent(MainActivity.this,ShopAddsActivity.class);

i.putExtra("data", b);

startActivity(i);

   }else{

   Intent i = new Intent(MainActivity.this,ShopbSelectActivity.class);

   i.putExtra("data", b);

startActivity(i);

   }

  }else{

  Toast.makeText(MainActivity.this, "帐号或密码错误!", 2000).show();

  }

  

}catch(Exception e){

   Toast.makeText(MainActivity.this, e.getMessage(), 2000).show();

}

}

});

}

 

@Override

public boolean onCreateOptionsMenu(Menu menu) {

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

    

}

用户注册类：

package com.example.shopcenter;

import android.os.Bundle;

import android.app.Activity;

import android.database.sqlite.SQLiteDatabase;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.RadioButton;

import android.widget.Toast;

 

public class ShopregActivity extends Activity {

//定义用于访问SQLite的对象

private SQLiteDatabase mSQLiteDatabase = null;

//数据库名称

private static final String DATABASE_NAME = "test.db";

private EditText edt_userid,edt_userpwd,edt_usermoney;

 

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_register);

try {

// 打开数据库，若是数据库不存在则建立数据库

mSQLiteDatabase = this.openOrCreateDatabase(DATABASE_NAME,

Activity.MODE_PRIVATE, null);

} catch (Exception ex) {

Toast.makeText(this, "打开或建立数据库异常:" + ex.getMessage(), 2000).show();

}

edt_userid = (EditText)this.findViewById(R.id.edt_userid);

edt_userpwd = (EditText)this.findViewById(R.id.edt_userpwd);

edt_usermoney= (EditText)this.findViewById(R.id.edt_usermoney);

Button bt3 = (Button) findViewById(R.id.button3);

bt3.setOnClickListener(new OnClickListener() {

 

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

ShopregActivity.this.finish();

}

});

Button button_register = (Button) this.findViewById(R.id.button_register);

button_register.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

String userid = edt_userid.getText().toString();

String userpwd = edt_userpwd.getText().toString();

int usermoney=Integer.parseInt(edt_usermoney.getText().toString());

RadioButton radio_buyer =(RadioButton) findViewById(R.id.radio_buyer);

String type = "seller";

if(radio_buyer.isChecked()){

type = "buyer";

}

try{

 

   mSQLiteDatabase.execSQL("insert into user values('"+userid+"','"+userpwd+"','"+usermoney+"','"+type+"')");

   Toast.makeText(ShopregActivity.this, "注册成功!", 2000).show();

}catch(Exception e){

   Toast.makeText(ShopregActivity.this, "新增用户失败:" + e.getMessage(), 2000).show();

}

}

});

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

getMenuInflater().inflate(R.menu.register, menu);

return true;

}

 

}

 

 

商品发布类：

package com.example.shopcenter;

 

import android.os.Bundle;

import android.app.Activity;

import android.content.Intent;

import android.database.sqlite.SQLiteDatabase;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

 

 

public class ShopAddsActivity extends Activity {

private SQLiteDatabase mSQLiteDatabase = null;

private static final String DATABASE_NAME = "test.db";

private EditText edit_shopnum, edit_shopname, edit_shopprice,edit_shopintro;

private String userId;

Button button_addshop, button_reset,button_seller_myshop;

 

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_seller_add_shop);

Intent i = this.getIntent();

Bundle b = i.getBundleExtra("data");

userId = b.getString("user");

edit_shopname = (EditText) findViewById(R.id.edt_shopname);

edit_shopintro = (EditText) findViewById(R.id.edt_shopintro);

edit_shopprice = (EditText) findViewById(R.id.edt_shopprice);

edit_shopnum = (EditText) findViewById(R.id.edit_shopnum);

Button bt5 = (Button) findViewById(R.id.button5);

bt5.setOnClickListener(new OnClickListener() {

 

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

ShopAddsActivity.this.finish();

}

});

button_addshop = (Button) findViewById(R.id.button_addshop);

button_addshop.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

String shopname = edit_shopname.getText().toString();

String shopintro = edit_shopintro.getText().toString();

int shopprice = Integer.parseInt(edit_shopprice.getText()

.toString());

int shopnum = Integer.parseInt(edit_shopnum.getText()

.toString());

String sql = "insert into goods values('" + shopname + "','"

+ shopintro + "',"+shopprice + "," + shopnum + ",'" + userId + "')";

try {

// 打开数据库，若是数据库不存在则建立数据库

mSQLiteDatabase = openOrCreateDatabase(DATABASE_NAME,

Activity.MODE_PRIVATE, null);

mSQLiteDatabase.execSQL(sql);

Toast.makeText(ShopAddsActivity.this, "添加商品成功!",

1000).show();

Intent i = new Intent(ShopAddsActivity.this,

null);//SellerCheckShopActivity.class

 Bundle b = new Bundle();

 b.putString("user", userId);

i.putExtra("data", b);

startActivity(i);

} catch (Exception e) {

// Toast.makeText(ShopAddsActivity.this,

// "添加商品异常!" + e.getMessage(), 1000).show();

}

}

});

 

}

 

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.seller_add_shop, menu);

return true;

}

 

}

已购商品类：

package com.example.shopcenter;

 

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import android.os.Bundle;

import android.app.Activity;

import android.content.Intent;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.AdapterView;

import android.widget.Button;

import android.widget.ListView;

import android.widget.SimpleAdapter;

import android.widget.TextView;

import android.widget.AdapterView.OnItemClickListener;

 

public class ShopbuyerActivity extends Activity {

 

private SQLiteDatabase mSQLiteDatabase = null;

// 数据库名称

private static final String DATABASE_NAME = "test.db";

private String userId, shopname;

private TextView tv;

private ListView lv1, lv2;

int buyermoney;

 

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_buyer_check_shop);

Intent i = this.getIntent(); // 接收数据

Bundle b = i.getBundleExtra("data");

userId = b.getString("user");

lv2 = (ListView) this.findViewById(R.id.lv_buyer_money);

lv1 = (ListView) this.findViewById(R.id.lv_buyer_myshop);

mSQLiteDatabase = openOrCreateDatabase(DATABASE_NAME, Activity.MODE_PRIVATE, null);

selectBuyermoney();

selectData();

Button bt1 = (Button) findViewById(R.id.button1);

bt1.setOnClickListener(new OnClickListener() {

 

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

ShopbuyerActivity.this.finish();

}

});

 

lv1.setOnItemClickListener(new OnItemClickListener() {

@Override

public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {

// 根据参数arg2获取当前位置的数据（行），并根据key获取对应的value

@SuppressWarnings("unchecked")

Map<String, Object> map = (Map<String, Object>) lv1.getItemAtPosition(arg2);

tv.setText(map.get("shopname").toString());

shopname = map.get("shopname").toString();

}

});

 

}

 

@Override

public boolean onCreateOptionsMenu(Menu menu) {

getMenuInflater().inflate(R.menu.buyer_check_shop, menu);

return true;

}

 

private void selectData() {

String sql = "select g.shopname,g.shopprice,bd.buyshopnum,g.shopseller from buyer_goods as bd,goods as g where bd.buyerid='"

+ userId + "' and bd.shopname=g.shopname";

Cursor cursor = mSQLiteDatabase.rawQuery(sql, null);

if (cursor != null) {

// 定义存储查询结果的List，每一行数据类型为Map<String, Object>，其中String表明列名，Object为值

List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();

Map<String, Object> map;

// 遍历游标对象，每一行获取的数据存放到Map<String, Object>类型的变量map中

while (cursor.moveToNext()) {

map = new HashMap<String, Object>();

map.put("shopname", cursor.getString(cursor.getColumnIndex("shopname")));

map.put("shopprice", cursor.getInt(cursor.getColumnIndex("shopprice")));

map.put("buyshopnum", cursor.getInt(cursor.getColumnIndex("buyshopnum")));

map.put("shopseller", cursor.getString(cursor.getColumnIndex("shopseller")));

list.add(map);

}

// 建立Adapter，并于ListView绑定

SimpleAdapter adapter = new SimpleAdapter(this, list, R.layout.buyer_myshop,

new String[] { "shopname", "shopprice", "buyshopnum", "shopseller" },

new int[] { R.id.tv_buyer_myshopname, R.id.tv_buyer_myshopprice, R.id.tv_buyer_myshopnum,

R.id.tv_buyer_mysellername });

lv1.setAdapter(adapter);

}

}

 

private void selectBuyermoney() {

String sql = "select usermoney from user where userid='" + userId + "'";

// 得到查询结果对应的游标对象

Cursor cursor = mSQLiteDatabase.rawQuery(sql, null);

if (cursor != null) {

// 定义存储查询结果的List，每一行数据类型为Map<String, Object>，其中String表明列名，Object为值

List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();

Map<String, Object> map;

while (cursor.moveToNext()) {

map = new HashMap<String, Object>();

map.put("usermoney", cursor.getInt(cursor.getColumnIndex("usermoney")));

list.add(map);

}

// 建立Adapter，并于ListView绑定

SimpleAdapter adapter = new SimpleAdapter(this, list, R.layout.buyer_money2, new String[] { "usermoney" },

new int[] { R.id.tv_buyer_money2 });

lv2.setAdapter(adapter);

 

}

 

}

 

}

商品购买类：

package com.example.shopcenter;

 

 

 

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import android.os.Bundle;

import android.annotation.SuppressLint;

import android.app.Activity;

import android.content.Intent;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.AdapterView;

import android.widget.Button;

import android.widget.EditText;

import android.widget.ListView;

import android.widget.SimpleAdapter;

import android.widget.TextView;

import android.widget.Toast;

import android.widget.AdapterView.OnItemClickListener;

 

 

 

 

@SuppressLint("ShowToast")

public class ShopbSelectActivity extends Activity  {

private SQLiteDatabase mSQLiteDatabase = null;

//数据库名称

private static final String DATABASE_NAME = "test.db";

private TextView tv;

private ListView lv1,lv2;

private Button btn_selectshop,btn_myshop,btn_addmoney;

private String userId;

private String shopprice;

EditText edt_addmoney,edt_buy_shopnum;

int buy_shopnum;

int buyermoney;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_buyer_select_shop);

Intent i = this.getIntent();

Bundle b = i.getBundleExtra("data");

userId = b.getString("user");

tv = (TextView)this.findViewById(R.id.tv_buyer_selectshopname);

lv2 = (ListView) this.findViewById(R.id.lv_buyer_money);

lv1 = (ListView) this.findViewById(R.id.lv_buyer_shop);

 

lv1.setOnItemClickListener(new OnItemClickListener() {

@Override

public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,

long arg3) {

@SuppressWarnings("unchecked")

Map<String, Object> map = (Map<String, Object>) lv1

.getItemAtPosition(arg2);

tv.setText(map.get("shopname").toString());

 shopprice=map.get("shopprice").toString();

}

});

try {

mSQLiteDatabase = this.openOrCreateDatabase(DATABASE_NAME,

Activity.MODE_PRIVATE, null);

} catch (Exception ex) {

Toast.makeText(this, "打开或建立数据库异常:" + ex.getMessage(), 2000).show();

}

selectData();

selectBuyermoney();

edt_buy_shopnum=(EditText)this.findViewById(R.id.edittext_buy_shopnum);

btn_selectshop =  (Button)this.findViewById(R.id.button_buyer_selectshop);

btn_selectshop.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

String shopname = tv.getText().toString();

 buy_shopnum=Integer.parseInt(edt_buy_shopnum.getText().toString());

int price=Integer.parseInt(shopprice);

int total_price=buy_shopnum*price;

try {

 String a="select usermoney from user  where userid='"+userId+"' " ;

Cursor cursor = mSQLiteDatabase.rawQuery(a, null);

while (cursor.moveToNext()) {

 buyermoney= cursor.getInt(cursor.getColumnIndex("usermoney"));

 

}

 

 

if(buyermoney>=total_price){

 

String sql = "update goods set shopnum=shopnum-"+buy_shopnum+" where shopname='"+shopname+"' " ;

mSQLiteDatabase.execSQL(sql);

sql="update user set usermoney=usermoney-"+total_price+" where userid='"+userId+"'";

mSQLiteDatabase.execSQL(sql);

 sql = "insert into buyer_goods(buyerid,shopname,buyshopnum) values('" + userId + "','"

+ shopname + "','"+buy_shopnum+"')";

mSQLiteDatabase.execSQL(sql);

 

Toast.makeText(ShopbSelectActivity.this, "购买成功!",

1000).show();

Intent i = new Intent(ShopbSelectActivity.this,

ShopbSelectActivity.class);

 Bundle b = new Bundle();

 b.putString("user", userId);

i.putExtra("data", b);

startActivity(i);

}

else {Toast.makeText(ShopbSelectActivity.this, "余额不足，请充值!",

3000).show();}

} catch (Exception e) {

Toast.makeText(ShopbSelectActivity.this,

"添加商品异常!" + e.getMessage(), 1000).show();

}

 

}

});

btn_myshop=  (Button)this.findViewById(R.id.button_buyer_myshop);

btn_myshop.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

Intent i = new Intent(ShopbSelectActivity.this,

ShopbuyerActivity.class);

 Bundle b = new Bundle();       //发送数据

 b.putString("user", userId);

i.putExtra("data", b);

startActivity(i);

}

});

edt_addmoney=(EditText)this.findViewById(R.id.edittext_addmoney);

btn_addmoney=  (Button)this.findViewById(R.id.button_addmoney);

btn_addmoney.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

String addmoney=edt_addmoney.getText().toString();

String sql = "update user set usermoney=usermoney+"+addmoney+"  where userid='"+userId+"' " ;

mSQLiteDatabase.execSQL(sql);

Toast.makeText(ShopbSelectActivity.this, "成功充值"+addmoney+"元!",

1000).show();

Intent i = new Intent(ShopbSelectActivity.this,

ShopbSelectActivity.class);

 Bundle b = new Bundle();

 b.putString("user", userId);

i.putExtra("data", b);

startActivity(i);

}

});

}

 

 

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.buyer_select_shop, menu);

return true;

}

 

private void selectData() {

String sql = "select * from goods ";

//得到查询结果对应的游标对象

Cursor cursor = mSQLiteDatabase.rawQuery(sql, null);

if (cursor != null) {

//定义存储查询结果的List，每一行数据类型为Map<String, Object>，其中String表明列名，Object为值

List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();

Map<String, Object> map;

        //遍历游标对象，每一行获取的数据存放到Map<String, Object>类型的变量map中

while (cursor.moveToNext()) {

map = new HashMap<String, Object>();

map.put("shopname", cursor.getString(cursor.getColumnIndex("shopname")));

map.put("shopintro", cursor.getString(cursor.getColumnIndex("shopintro")));

map.put("shopprice", cursor.getInt(cursor.getColumnIndex("shopprice")));

map.put("shopnum", cursor.getString(cursor.getColumnIndex("shopnum")));

map.put("shopseller", cursor.getString(cursor.getColumnIndex("shopseller")));

list.add(map);

}

        //建立Adapter，并于ListView绑定

SimpleAdapter adapter = new SimpleAdapter(this, list,

R.layout.buyer_shop, new String[] { "shopname","shopintro", "shopprice",

"shopnum","shopseller"}, new int[] { R.id.tv_buyer_myshopname,R.id.tv_buyer_myshopintro, R.id.tv_buyer_myshopprice,

R.id.tv_buyer_shopnum ,R.id.tv_buyer_sellername});

lv1.setAdapter(adapter);

}

}

private void selectBuyermoney(){

String sql = "select usermoney from user where userid='"+userId+"'";

//得到查询结果对应的游标对象

Cursor cursor = mSQLiteDatabase.rawQuery(sql, null);

if (cursor != null) {

//定义存储查询结果的List，每一行数据类型为Map<String, Object>，其中String表明列名，Object为值

List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();

Map<String, Object> map;

while (cursor.moveToNext()) {

map = new HashMap<String, Object>();

map.put("usermoney", cursor.getInt(cursor.getColumnIndex("usermoney")));

list.add(map);

}

        //建立Adapter，并于ListView绑定

SimpleAdapter adapter = new SimpleAdapter(this, list,

R.layout.buyer_money, new String[] { "usermoney"}, new int[] { R.id.tv_buyer_money});

lv2.setAdapter(adapter);

    

 

 

}

 

}

 

 

 

 

}