Android基础知识【项目实训】【2】

时间：2014-12-26 09:42:12 阅读：326 评论：0 收藏：0 [点我收藏+]

标签：android

【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="@drawable/welcome" />
	<TextView 
	    android:layout_width="match_parent"
	    android:layout_height="wrap_content"
	    android:gravity="right"
	    android:text="欢迎使用百米购 V1.0"
	    android:layout_alignParentBottom="true"
	    android:textSize="12sp"
	    />
</RelativeLayout>

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】

标签：android

原文地址：http://blog.csdn.net/freeman527/article/details/42167199

踩

(0)

评论一句话评论（0）

分享档案

更多>

2021年07月29日 (22)
2021年07月28日 (40)
2021年07月27日 (32)
2021年07月26日 (79)
2021年07月23日 (29)
2021年07月22日 (30)
2021年07月21日 (42)
2021年07月20日 (16)
2021年07月19日 (90)
2021年07月16日 (35)

周排行