一、课程设计目的
1.android开发的综合训练
2.提高软件开发的综合能力
二、开发环境
Android Studio
三、课程设计内容
网上订餐项目是一个类似外卖的项目，其中包含订餐的店铺、各店铺的菜单、购物车以及订单与付款等模块。在店铺列表中可以看到店铺的名称、月销售、起送价格与配送费用、配送时间以及福利等信息，点击店铺列表中的任意一个店铺，进入到店铺详情界面，该界面主要显示店铺中的菜单，同时可以将想要吃的菜添加到购物车中，选完菜之后可以点击该界面中的“去结算”按钮，进入到订单界面，在该界面核对已点的菜单信息，并通过“去支付”按钮进行付款。
参考截图（注：采用单机版开发）
Android设计获取：https://download.csdn.net/download/qq_61562251/87861222?spm=1001.2014.3001.5501
四、课程设计过程
各功能模块设计，关键代码，运行截图
用户登入验证
public void user_into(View view) {
name=user_name.getText().toString();
password=user_password.getText().toString();
userHelper = new UserHelper(getApplicationContext(), UserHelper.name, null, 1);
if(TextUtils.isEmpty(user_name.getText())||TextUtils.isEmpty(user_password.getText())){
tips.setText("输入不能为空！");
}else{
if(userHelper.login(name,password)){
Toast.makeText(getApplicationContext(), "登入成功", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(MainActivity.this, UserInterface.class);
startActivity(intent);
}else{ tips.setText("账号或密码不正确！"); }
}
}
public boolean login(String username, String password) {
SQLiteDatabase db = this.getWritableDatabase();
String sql = "Select * from "+userTable+" where user=? and password=?";
Cursor cursor = db.rawQuery(sql, new String[]{username, password});
if (cursor.moveToFirst()) {
cursor.close();
return true;
}
return false;
}
Listview点击监听滑动监听与数值传递、适配器
//item界面设置
MyAdapter myAdapter = new MyAdapter();
merchantList.setAdapter(myAdapter);
//listView点击监听，滑动监听
merchantList.setOnItemClickListener(new AdapterView.OnItemClickListener() {///List
@Override
//点击监听
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String name = (String) merchantList.getAdapter().getItem(position);
Bundle bundle1 = new Bundle();
bundle1.putInt("position",position);
bundle1.putString("name",name);
Intent intent = new Intent(UserInterface.this, MerchantInterface.class);
intent.putExtras(bundle1);
startActivity(intent);
}
// 状态改变时调用
public void onScrollStateChanged(AbsListView absListView, int scrollState) {
switch (scrollState) {
case AbsListView.OnScrollListener.SCROLL_STATE_FLING:
Log.i("logi", "进入惯性滑动状态");
break;
case AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:
Log.i("logi", "进入正在滑动状态");
break;
case AbsListView.OnScrollListener.SCROLL_STATE_IDLE:
Log.i("logi", "滑动停止状态");
break;
}
}
});
//item界面设置
class MyAdapter extends BaseAdapter {
//获取 item 条目总数
@Override
public int getCount() {
merchantHelper = new MerchantHelper(getApplicationContext(), MerchantHelper.name, null, 1);
List<String> titles=merchantHelper.readAll();
int i;
for(i=0;i<titles.size();i++){
System.out.println(i);
}
return i;
}
//返回 item 数据对象
@Override
public Object getItem(int i) {
merchantHelper = new MerchantHelper(getApplicationContext(), MerchantHelper.name, null, 1);
List<String> titles=merchantHelper.readAll();
return titles.get(i);
}
//返回 item 的 id
@Override
public long getItemId(int i) {
return i;
}
//得到 item 视图
@Override
public View getView(int i, View view, ViewGroup viewGroup) {
merchantHelper = new MerchantHelper(getApplicationContext(), MerchantHelper.name, null, 1);
List<String> titles=merchantHelper.readAll();
//加载 list_item.xml 布局文件------将布局文件转换为一个控件
View view1 = View.inflate(UserInterface.this,R.layout.item,null);
TextView title = view1.findViewById(R.id.title);
TextView price = view1.findViewById(R.id.price);
ImageView iv = view1.findViewById(R.id.iv);
title.setText(titles.get(i));
price.setText(prices[i]);
iv.setBackgroundResource(icons[i]);
return view1;
}
}
数据库获取
//全部商家获取
public List<String> readAll () {
List<String> allCommodities = new ArrayList<String>();
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery("select * from "+merchantTable,null);
if(cursor.moveToFirst()) {
do {
String title =cursor.getString(0);
allCommodities.add(title);
}while (cursor.moveToNext());
}
cursor.close();
return allCommodities;
}
//实现商店点击事件跳转
Bundle b = getIntent().getExtras();//获取上一个界面传递的数值
if( b != null) {
name=b.getString("name");//获取具体数值
merchantName.setText(name.toCharArray(), 0, name.length());
position = b.getInt("position");
Toast.makeText(getApplicationContext(), name, Toast.LENGTH_SHORT).show();
//对上一个界面传递的position值进行switch方法执行，获取商家头像
switch (position){
case 0:
headPortrait.setBackgroundResource(R.drawable.img_12);
break;
case 1:
headPortrait.setBackgroundResource(R.drawable.img_13);
break;
case 2:
headPortrait.setBackgroundResource(R.drawable.img_14);
break;
case 3:
headPortrait.setBackgroundResource(R.drawable.img_15);
break;
case 4:
headPortrait.setBackgroundResource(R.drawable.img_16);
break;
case 5:
headPortrait.setBackgroundResource(R.drawable.img_17);
break;
default:
throw new IllegalStateException("Unexpected value: " + position);
}
}
//数据库指定内容输出
List<String> titles = goodsHelper.readAllStr(merchant, 0);
List<String> goodDetailS = goodsHelper.readAllStr(merchant, 2);
List<String> merchantS = goodsHelper.readAllStr(merchant, 1);
List<Integer> srcS = goodsHelper.readAllInt(merchant, 3);
List<Integer> priceS = goodsHelper.readAllInt(merchant, 4);
//item内部键数据输入
viewHolder.src.setBackgroundResource(srcS.get(i));
viewHolder.good.setText(" " + titles.get(i));
viewHolder.price.setText(" " + priceS.get(i));
viewHolder.detail.setText(" " + goodDetailS.get(i));
//商品添加点击监听
viewHolder.add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "添加商品："+viewHolder.good.getText().toString(), Toast.LENGTH_SHORT).show();
priceSum[0] =priceSum[0]+priceS.get(i);
sumS[0] ="已添加："+j[0]+"件 ￥";
sum.setText(sumS[0]);
money.setText(String.valueOf(priceSum[0]));
j[0]++;
}
});
//结算按钮点击事件
settlement.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Bundle bundle1 = new Bundle();
bundle1.putInt("sumPrice",Integer.valueOf(money.getText().toString()));
bundle1.putString("goodName",viewHolder.good.getText().toString());
bundle1.putString("merchantName",merchantS.get(i));
Intent intent = new Intent(MerchantInterface.this, Settlement.class);
intent.putExtras(bundle1);
startActivity(intent);
}
});
用户注册并触发另外两个数据库的存储
if (TextUtils.isEmpty(user_name.getText())){
Toast.makeText(getApplicationContext(), "用户名不能为空", Toast.LENGTH_SHORT).show();
}else if (TextUtils.isEmpty(user_password.getText())){
Toast.makeText(getApplicationContext(), "密码不能为空", Toast.LENGTH_SHORT).show();
}else if (TextUtils.isEmpty(user_repassword.getText())){
tips.setText("两次密码输入不正确！");
user_repassword.setText("");
}else if(user_password.getText().toString().equals(user_repassword.getText().toString())==false){
tips.setText("两次密码输入不正确！");
user_repassword.setText("");
} else if(user_password.getText().toString().equals(user_repassword.getText().toString())) {
if(userHelper.addUser(name,password)){//执行用户添加后，同时对商家和商品进行添加
if (merchantHelper.addUser("黄氏卤味","188559922100")&&
merchantHelper.addUser("千本寿司","135164884200")&&
merchantHelper.addUser("悠然餐厅","199428835511")&&
merchantHelper.addUser("每日早餐","177880011223")&&
merchantHelper.addUser("88快餐","133569010236")&&
……（省略相似代码）
goodsHelper.addGood("韩式炸鸡","华莱士","约500克",R.drawable.img_53, 20))
{
Toast.makeText(getApplicationContext(), "添加成功", Toast.LENGTH_SHORT).show();
//保存activity状态到SaveTable，默认模式
//默认模式：代表文件是私有数据，只能被应用本身访问，写入的内容会覆盖源文件的内容
SharedPreferences sharedP=getSharedPreferences("SaveTable",MODE_PRIVATE);
SharedPreferences.Editor editor=sharedP.edit();//API超连接，类似于map
int num=sharedP.getInt("number", 0);//获取储存的值
num++;
editor.putInt("number", num);//上传数值
editor.commit();//数据提交
finish();//结束数据上传
}
}else{
Toast.makeText(getApplicationContext(), "添加失败", Toast.LENGTH_SHORT).show();
}
// Toast.makeText(getApplicationContext(), "添加失败", Toast.LENGTH_SHORT).show();
}
//item界面设置
MyAdapter myAdapter = new MyAdapter();
menu.setAdapter(myAdapter);
//传递数据获取，商品金额计算
b = getIntent().getExtras();
if( b != null) {
name=b.getString("merchantName");
merchant.setText(name.toCharArray(), 0, name.length());
price = b.getInt("sumPrice");
Toast.makeText(getApplicationContext(), String.valueOf(price), Toast.LENGTH_SHORT).show();
price=price+5;
total.setText("￥ "+String.valueOf(price));
}
//item界面设置
MyAdapter myAdapter = new MyAdapter();
menu.setAdapter(myAdapter);
//传递数据获取，商品金额计算
b = getIntent().getExtras();
if( b != null) {
name=b.getString("merchantName");
merchant.setText(name.toCharArray(), 0, name.length());
price = b.getInt("sumPrice");
Toast.makeText(getApplicationContext(), String.valueOf(price), Toast.LENGTH_SHORT).show();
price=price+5;
total.setText("￥ "+String.valueOf(price));
}
//地址
public void address(View view) {
showExitDialog01();
}
// 可输入文本的提示框
private void showExitDialog01(){
final EditText edt = new EditText(this);
edt.setMinLines(3);
new AlertDialog.Builder(this)
.setTitle("请输入")
.setIcon(android.R.drawable.ic_dialog_info)
.setView(edt)
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
addressB.setText(edt.getText().toString());
}
})
.setNegativeButton("取消", null)
.show();
}
//时间
public void time(View view) {
showExitDialog02();
}
// 单选提示框
private void showExitDialog02(){
new AlertDialog.Builder(this)
.setTitle("请选择")
.setIcon(android.R.drawable.ic_dialog_info)
.setSingleChoiceItems(new String[]{"11:00~12:00","12:00~13:00","17:00~18:00","18:00~19:00","19:00~20:00","20:00~21:00"}, -1, new DialogInterface.OnClickListener(){
public void onClick(DialogInterface arg0, int arg1) {
switch (arg1) {
case 0:timeB.setText("11:00~12:00");break;
case 1:timeB.setText("12:00~13:00");break;
case 2:timeB.setText("17:00~18:00");break;
case 3:timeB.setText("18:00~19:00");break;
case 4:timeB.setText("19:00~20:00");break;
case 5:timeB.setText("20:00~21:00");break;
}
arg0.dismiss();
}
})
.setNegativeButton("取消", null)
.show();
}
//付款
public void settlement(View view) {
onBackPressed();
}
public void onBackPressed(){
AlertDialog dialog;
ImageView img = new ImageView(this);
img.setImageResource(R.drawable.img_55);
AlertDialog.Builder builder=new AlertDialog.Builder(this)
.setTitle("请扫码付款")
.setView(img);
dialog=builder.create();
dialog.show();
}
- 课程设计总结
本订餐系统一共调用了3个数据库，设计了9个界面。
其中考虑到商家和商品数据库的添加必须提前加入，并且添加事件不能直接放在主类中多次执行。设计触发执行的位置在注册页面，当用户注册添加到数据库时，随之商品和商家数据库一起添加。
在用户界面和商家界面上，使用数据库的读取方法，将数据库的所有数据进行输出为List<String>，然后存入对应的listview的item中。其中，使用for循环获取List<String>的长度。
在每一个界面间的数据关系，使用Bundle方法进行数值传递。例如用户界面点击跳转到对应的商家界面，利用Bundle传递商家名字，利用商家名字对商品数据库进行查找对应商品。
商家登入界面，对所输入的名字进行数据库查询，若查询不到，则进行数据添加。商家管理的三个界面是实现商品数据库的增删改查。
文章来源：https://www.toymoban.com/news/detail-771735.html
文章来源地址https://www.toymoban.com/news/detail-771735.html
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