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Android基础知识【项目实训】【2】
【该项目实训是Android基础知识的一个综合练习，特别提示：项目中会用到一些图片素材，都是随意整理的，稍后会上传一个资源，包含该事项项目的基本功能，也含有图片素材】
【项目题目】：校园订餐App设计
综合案例
【目标】
因为项目只涉及基础知识，因此项目中所用数据并不联网，都读取单机数据库。（即将该项目中所用数据，如菜品信息、店铺信息等存入数据库）用户在第一次打开该项目时，会在用户手机上创建这些数据库，并插入测试数据。
1、先制作一个欢迎界面，欢迎的同时，准备数据库
欢迎界面Activity对应的类是FlashActivity，代码如下：
public class FlashActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
//getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_flash);
new Handler().postDelayed(new Runnable(){
@Override
public void run() {
initDb();// 初始化数据库
Intent intent=new Intent(FlashActivity.this,MainActivity.class);
startActivity(intent);
FlashActivity.this.finish();
}}, 3500);
}
public void initDb(){
EatDbHelper dbh=new EatDbHelper(this,"fooddb.db3",null,1);
dbh.getReadableDatabase();
}
}对应的布局文件是：
<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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".FlashActivity" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src=http://www.mamicode.com/"@drawable/welcome" />>2、上面的Activity用到 EatDbHelper类，这是一个操作SQLite数据库的帮助类，下面是代码：/**
* 创建数据库的帮助类
* @author Administrator
*
*/
public class EatDbHelper extends SQLiteOpenHelper {
private EatDbHelper dbHelper;
public EatDbHelper(Context context, String name, CursorFactory factory,
int version) {
super(context, name, factory, version);
}
public EatDbHelper getInstance(){
if(dbHelper!=null) return dbHelper;
dbHelper =this;
return dbHelper;
}
@Override
public void onCreate(SQLiteDatabase db) {
//创建必须表
db.execSQL(DbTables.tb_account); //订单表
db.execSQL(DbTables.tb_accountItem); //订单项表
db.execSQL(DbTables.tb_comment); //评价表
db.execSQL(DbTables.tb_foodInfo); //食品表
db.execSQL(DbTables.tb_shopInfo); //店铺表
db.execSQL(DbTables.tb_userInfo); //用户信息表
Log.i("Msg", "创建数据库、 表完成");
//插入数据
for (String sql:DbTables.userDb) {
db.execSQL(sql);
}
for (String sql:DbTables.shopDb) {
db.execSQL(sql);
}
for (String sql:DbTables.foodDb) {
db.execSQL(sql);
}
Log.i("Msg", "插入测试数据完成");
}
@Override
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
}
}3、因为需要创建多张表，插入多条测试数据，所用单独为这些Sql语句准备了一个静态类，方便引用（这是非正常做法）在DbTables这个类中，准备了改项目用到的创建表格Sql语句和插入数据的Sql语句
public class DbTables {
public static String tb_foodInfo="create table tb_foodInfo(" +
"_id integer primary key autoincrement," +
"foodName varchar,price varchar,isPromotion varchar,discount varchar," +
"category varchar,type varchar,score varchar,shopId integer," +
"imgId varchar,des varchar" +
")";
public static String tb_shopInfo="create table tb_shopInfo(" +
"_id integer primary key autoincrement," +
"shopName varchar, phone varchar,address varchar," +
"score varchar,type varchar,imgId varchar" +
")";
public static String tb_userInfo="create table tb_userInfo(" +
"_id integer primary key autoincrement," +
"username varchar,loginName varchar,loginpwd varchar," +
"phone varchar, address varchar,sex varchar,birthday date," +
"score float, userImage varchar" +
")";
public static String tb_comment="create table tb_comment(" +
"_id integer primary key autoincrement," +
"userid integer,foodId integer , message varchar,state varchar" +
")";
public static String tb_accountItem="create table tb_accountItem(" +
"_id integer primary key autoincrement," +
"accountId integer,foodid integer, count integer" +
")";
public static String tb_account="create table tb_account(" +
"_id integer primary key autoincrement," +
"userid integer,state integer, createDate date" +
")";
public static List<String>userDb=new ArrayList<String>();
public static List<String>shopDb=new ArrayList<String>();
public static List<String>foodDb=new ArrayList<String>();
static{
userDb.add("insert into tb_userInfo(userName,loginName,loginpwd,phone,address," +
"sex,birthday,score,userImage) " +
"values('曹操','caocao','caocao','13012345500'," +
"'师范大学一区25栋10-11','男','1995-10-11','100','0x7f020014')");
shopDb.add("insert into tb_shopInfo(shopName,phone,address,score,type,imgId)" +
" values('小张快餐','15566881230','师大西门小吃街','100','1','0x7f020016')");
shopDb.add("insert into tb_shopInfo(shopName,phone,address,score,type,imgId)" +
" values('加州面馆','1851357788','师大西门小吃街','500','1','0x7f020016')");
shopDb.add("insert into tb_shopInfo(shopName,phone,address,score,type,imgId)" +
" values('大饼夹一切','13051350011','师大西门小吃街','20','1','0x7f020016')");
foodDb.add("insert into tb_foodInfo(foodName,isPromotion,discount,category," +
"type,score,shopid,imgId,price)" +
"values('水果披萨','0','1','西餐','甜香','100','1','0x7f020005','26.00')");
foodDb.add("insert into tb_foodInfo(foodName,isPromotion,discount,category," +
"type,score,shopid,imgId,price)" +
"values('红豆汤圆','0','1','中餐','甜香','100','1','0x7f020006','12.50')");
foodDb.add("insert into tb_foodInfo(foodName,isPromotion,discount,category," +
"type,score,shopid,imgId,price)" +
"values('蔬菜汉堡','1','0.8','西餐','微甜','10','1','0x7f020007','6.00')");
foodDb.add("insert into tb_foodInfo(foodName,isPromotion,discount,category," +
"type,score,shopid,imgId,price)" +
"values('蔬菜沙拉','1','0.6','西餐','甜香','20','1','0x7f020008','5.00')");
foodDb.add("insert into tb_foodInfo(foodName,isPromotion,discount,category," +
"type,score,shopid,imgId,price)" +
"values('芝香烤肉','0','1','中餐','香辣','500','1','0x7f020009','14.00')");
foodDb.add("insert into tb_foodInfo(foodName,isPromotion,discount,category," +
"type,score,shopid,imgId,price)" +
"values('辣味意面','0','1','西餐','香辣','400','1','0x7f02000a','12.00')");
foodDb.add("insert into tb_foodInfo(foodName,isPromotion,discount,category," +
"type,score,shopid,imgId,price)" +
"values('薯条','1','0.9','配菜','香甜','200','1','0x7f02000b','5.00')");
foodDb.add("insert into tb_foodInfo(foodName,isPromotion,discount,category," +
"type,score,shopid,imgId,price,des)" +
"values('烤鸡腿','1','1','中餐','微辣','600','1','0x7f02000c','8.00','精选鸡腿，用心烤制，外焦里内，喷香诱人……')");
}
}4、欢迎界面是一个Activity，需要配置： <!-- 欢迎界面 -->
<activity
android:name="com.example.eatall.FlashActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>5、运行一下看效果：（所有的素材都很随意，请忍耐）
Android基础知识【项目实训】【2】
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