第十次作业

package com.example.shopping;

import java.util.ArrayList;

import com.example.adapter.shopAdapter;
import com.example.bean.shopBean;

import Database.SQLiteHelpe;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends Activity implements View.OnClickListener {
     
    private static final Context Context = null;
    private EditText mName;
    private EditText mPrice;
    private EditText mAmount;
    private ArrayList<shopBean> list;
    ListView mLv;
    private SQLiteHelpe mSQLiteHelpe = new SQLiteHelpe(this);
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
    }
    public void init() {
        mName = (EditText)findViewById(R.id.ed_name);
        mPrice = (EditText)findViewById(R.id.ed_price);
        mAmount = (EditText)findViewById(R.id.ed_amount);
        Button add = (Button) findViewById(R.id.bu_add);
        Button delect = (Button) findViewById(R.id.bu_delete);
        Button updata = (Button) findViewById(R.id.bu_updata);
        Button query = (Button) findViewById(R.id.bu_query);
        add.setOnClickListener(this);
        delect.setOnClickListener(this);
        updata.setOnClickListener(this);
        query.setOnClickListener(this);
        mLv = (ListView) findViewById(R.id.lv);
        list = mSQLiteHelpe.Query();
        shopAdapter adapter = new shopAdapter(list);
        mLv.setAdapter(adapter);
        
        
    }
    @Override
    public void onClick(View v) {
        String name = mName.getText().toString();
        String price = mPrice.getText().toString();
        String amounts = mAmount.getText().toString();
        
        switch (v.getId()) {
        case R.id.bu_add:
            if(mSQLiteHelpe.Insert(name, price, amounts)){
                Toast.makeText(this, "添加成功", 0).show();
                list = mSQLiteHelpe.Query();
                shopAdapter adapter = new shopAdapter(list);
                mLv.setAdapter(adapter);
            }else {
                Toast.makeText(this, "添加失败", 0).show();
            }
            break;
        case R.id.bu_delete:
            if(mSQLiteHelpe.Delect(name)) {
                Toast.makeText(this, "删除成功", 0).show();
                list = mSQLiteHelpe.Query();
                shopAdapter adapter = new shopAdapter(list);
                mLv.setAdapter(adapter);
            }else {
                Toast.makeText(this, "删除失败", 0).show();
            }
            break;
        case R.id.bu_updata:
            if(mSQLiteHelpe.Upadta(name, price, amounts)) {
                Toast.makeText(this, "修改成功", 0).show();
                list = mSQLiteHelpe.Query();
                shopAdapter adapter = new shopAdapter(list);
                mLv.setAdapter(adapter);
            }else {
                Toast.makeText(this, "修改失败", 0).show();
            }
            break;
        case R.id.bu_query:
            list = mSQLiteHelpe.Query();
            shopAdapter adapter = new shopAdapter(list);
            mLv.setAdapter(adapter);
            break;
        }
    }
}

package com.example.utils;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.provider.BaseColumns;

public class DBUtils extends SQLiteOpenHelper implements BaseColumns {

    private String DATABASE_NAME="Shopping";
    public static final String DATABASE_TABLE="Shop";
    public static final int  DATABASE_VERSION=1;
//    数据库中的列名
    public static final String SHOP_NAME="name";
    public static final String SHOP_PRICE="price";
    public static final String SHOP_AMOUNTS="amounts";
    public DBUtils(Context context) {
        super(context, DATABASE_TABLE, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table "+DATABASE_TABLE+""
                + "("+_ID+" integer primary Key autoincrement, "+SHOP_NAME+" text,"+SHOP_PRICE+" text,"+SHOP_AMOUNTS+" text)");
         
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub

    }

}

package Database;

import java.util.ArrayList;
import java.util.List;

import com.example.bean.shopBean;
import com.example.utils.DBUtils;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;


public class SQLiteHelpe {

    private static DBUtils mDBUtils;
    
    public SQLiteHelpe(Context c) {
        mDBUtils = new DBUtils(c);
    }
//    保存
    static public boolean Insert (String name,String price,String amounts) {
        SQLiteDatabase  db =mDBUtils.getWritableDatabase();
        ContentValues values  = new ContentValues();
        values.put(DBUtils.SHOP_NAME, name);
        values.put(DBUtils.SHOP_PRICE, price);
        values.put(DBUtils.SHOP_AMOUNTS, amounts);
        long Insertid =db.insert(DBUtils.DATABASE_TABLE, null, values);
        return Insertid!=0;
    }
//    删除
    static public boolean Delect (String name) {
        SQLiteDatabase  db =mDBUtils.getWritableDatabase();
        int DeleteId =db.delete(DBUtils.DATABASE_TABLE, DBUtils.SHOP_NAME+"=?", new String[] {name});
        return DeleteId!=0;
    }
//    修改
    static public boolean Upadta(String name,String price ,String amounts) {
        SQLiteDatabase  db =mDBUtils.getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put("price", price);
        values.put("amounts", amounts);
        int UpdataId =db.update(DBUtils.DATABASE_TABLE, values , DBUtils.SHOP_NAME+"=?", new String[] {name});
        return UpdataId!=0;
    }
//    查询
    static public ArrayList<shopBean> Query() {
        ArrayList<shopBean> list = new ArrayList<shopBean>();
        SQLiteDatabase  db =mDBUtils.getReadableDatabase();
        Cursor cursor =db.query(DBUtils.DATABASE_TABLE, null, null, null, null, null, null);
        if(cursor!=null) {
            while (cursor.moveToNext()) {
                shopBean bean = new shopBean();
                 String id =cursor.getString(cursor.getColumnIndex(DBUtils._ID));
                 String name = cursor.getString(cursor.getColumnIndex(DBUtils.SHOP_NAME));
                 String price =cursor.getString(cursor.getColumnIndex(DBUtils.SHOP_PRICE));
                 String amounts =cursor.getString(cursor.getColumnIndex(DBUtils.SHOP_AMOUNTS));
                 bean.setId(id);
                 bean.setName(name);
                 bean.setPrice(price);
                 bean.setAmounts(amounts);
                 list.add(bean);
            }
            cursor.close();
        }
        return list;
    }
    
}

<LinearLayout 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"
    android:orientation="vertical"
    android:background="#e6e6e6"
    tools:context="com.example.shopping.MainActivity" >
   <LinearLayout 
       android:layout_width="match_parent"
       android:layout_height="30dp"
       android:orientation="horizontal"
       android:background="#ffffff"
       android:layout_marginTop="10dp">
       <TextView 
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="名称:"
           android:textSize="20sp"
           android:layout_gravity="center"
          />  
        <EditText 
            android:id="@+id/ed_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="20sp"
            android:layout_gravity="center"
            android:background="#ffffff"/>    
   </LinearLayout>
   <LinearLayout 
       android:layout_width="match_parent"
       android:layout_height="30dp"
       android:orientation="horizontal"
       android:background="#ffffff"
       android:layout_marginTop="10dp">
       <TextView 
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="价格:"
           android:textSize="20sp"
           android:layout_gravity="center"
          />  
        <EditText 
            android:id="@+id/ed_price"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="20sp"
            android:layout_gravity="center"
            android:background="#ffffff"/>    
   </LinearLayout>
   <LinearLayout 
       android:layout_width="match_parent"
       android:layout_height="30dp"
       android:orientation="horizontal"
       android:background="#ffffff"
       android:layout_marginTop="10dp">
       <TextView 
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="数量:"
           android:textSize="20sp"
           android:layout_gravity="center"
          />  
        <EditText 
            android:id="@+id/ed_amount"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="20sp"
            android:layout_gravity="center"
            android:background="#ffffff"/>    
   </LinearLayout>
   <LinearLayout 
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:orientation="horizontal"
       android:layout_marginTop="10dp"
       >
       <Button 
           android:id="@+id/bu_add"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="增加"
           android:layout_marginLeft="15dp"/>
       <Button 
           android:id="@+id/bu_delete"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="删除"/>
       <Button 
           android:id="@+id/bu_updata"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="修改"/>
       <Button 
           android:id="@+id/bu_query"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:text="查询"/>
   </LinearLayout>
   <ListView 
       android:id="@+id/lv"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       ></ListView>
</LinearLayout>