商品展示

来源：互联网发布：树洞源码编辑：程序博客网时间：2024/04/27 22:14

1、activity_main.xml文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    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="bzu.edu.cn.productlist.MainActivity"    android:orientation="vertical">    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content">        <EditText            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:hint="商品名称"            android:id="@+id/EdName"            />        <EditText            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:hint="金额"            android:id="@+id/EdBalance"            />        <ImageView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:background="@android:drawable/ic_input_add"            android:id="@+id/IVAdd"            android:onClick="addProduct"/>    </LinearLayout>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        >        <ListView            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:id="@+id/lv_product">        </ListView>    </LinearLayout></LinearLayout>

2、创建ListView Item布局

在res/layout目录下创建product_item.xml文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <TextView        android:layout_width="0dp"        android:layout_height="30dp"        android:id="@+id/idTV"        android:text="1"        android:gravity="center"        android:layout_weight="1"        android:layout_marginLeft="5dp"        android:textSize="20sp"/>    <TextView        android:layout_width="0dp"        android:layout_height="30dp"        android:id="@+id/nameTV"        android:text="phone"        android:gravity="center"        android:layout_weight="1"        android:layout_marginLeft="5dp"        android:textSize="20sp"/>    <TextView        android:layout_width="0dp"        android:layout_height="30dp"        android:id="@+id/balanceTV"        android:text="7777"        android:gravity="center"        android:layout_weight="1"        android:layout_marginLeft="5dp"        android:textSize="20sp"/>    <LinearLayout        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:orientation="vertical">        <ImageView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:background="@android:drawable/arrow_up_float"            android:layout_marginBottom="5dp"            android:id="@+id/upIV"            android:onClick="updateProductUp"            />        <ImageView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:background="@android:drawable/arrow_down_float"            android:id="@+id/downIV"           android:onClick="updateProductDown" />    </LinearLayout>    <ImageView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:background="@android:drawable/ic_menu_delete"        android:layout_marginLeft="5dp"        android:id="@+id/deleteIV"        android:onClick="deleteProduct"/></LinearLayout>

3、创建数据库

创建 DataBaseHelper类继承 SQLiteOpenHelper

package bzu.edu.cn.productlist.ProductHelper;import android.content.Context;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteOpenHelper;import android.util.Log;/** * Created by Administrator on 2017/4/17. */public class DataBaseHelper extends SQLiteOpenHelper {    private final String CREATE_ACCOUNT="create table account(id integer primary key autoincrement,name text,balance integer)";    public DataBaseHelper(Context context) {        super(context, "product.db", null, 2);    }    @Override    public void onCreate(SQLiteDatabase db) {        db.execSQL(CREATE_ACCOUNT);    }    @Override    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {        Log.d("DataBaseHelper","onUpgrade");    }}

4、创建Product类

package bzu.edu.cn.productlist.Product;/** * Created by Administrator on 2017/4/17. */public class ProductBean {    private int id;    private String name;    private Integer banlance;    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Integer getBanlance() {        return banlance;    }    public void setBanlance(Integer banlance) {        this.banlance = banlance;    }    public ProductBean(Integer id, String name, Integer banlance) {        this.id = id;        this.name = name;        this.banlance = banlance;    }    public ProductBean() {        super();    }    public String toString(){        return "[序号："+id+",商品名称："+name+",余额：,"+banlance+"]";    }}

5、创建数据库操作类ProductDao

package bzu.edu.cn.productlist.ProductHelper;import android.accounts.Account;import android.content.ContentValues;import android.content.Context;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.widget.Toast;import java.util.ArrayList;import java.util.List;import bzu.edu.cn.productlist.Product.ProductBean;/** * Created by Administrator on 2017/4/17. */public class ProductDao {    private Context context;    private  DataBaseHelper dataBaseHelper;    public ProductDao(Context context) {        this.context=context;        dataBaseHelper=new DataBaseHelper(this.context);    }    public void addData(ProductBean productBean){//添加数据        SQLiteDatabase db=dataBaseHelper.getWritableDatabase();        ContentValues contentValues=new ContentValues();//用来装载要插入的数据的Map        contentValues.put("name",productBean.getName());        contentValues.put("balance",productBean.getBanlance());        long id=db.insert("account",null,contentValues);        productBean.setId((int)id);//得到id        db.close();//关闭数据库    }    public List<ProductBean> queryData(){       List<ProductBean> productList=new ArrayList<ProductBean>();        SQLiteDatabase db=dataBaseHelper.getWritableDatabase();        Cursor cursor = db.query("account",null,null,null,null,null,null);        while(cursor.moveToNext()) {//将查询出来的数据添加到集合中        ProductBean productBean = new ProductBean();        productBean.setId(cursor.getInt(cursor.getColumnIndex("id")));        productBean.setName(cursor.getString(cursor.getColumnIndex("name")));        productBean.setBanlance(cursor.getInt(cursor.getColumnIndex("balance")));        productList.add(productBean);       }        db.close();        return productList;    }    public void  updateData(ProductBean productBean){        SQLiteDatabase db=dataBaseHelper.getWritableDatabase();        ContentValues contentValues=new ContentValues();        contentValues.put("name",productBean.getName());        contentValues.put("balance",productBean.getBanlance());        db.update("account",contentValues,"id=?",new String[]{productBean.getId()+""});//根据id修改        db.close();    }    public void deletedata(ProductBean productBean){        SQLiteDatabase db=dataBaseHelper.getWritableDatabase();        db.delete("account","id=?",new String[]{productBean.getId()+""});//根据id删除        db.close();    }}

6、自定义适配器ProductAdepter类

package bzu.edu.cn.productlist.ProductList;import android.app.AlertDialog;import android.content.Context;import android.content.DialogInterface;import android.support.annotation.NonNullimport android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;import java.util.List;import bzu.edu.cn.productlist.Product.ProductBean;import bzu.edu.cn.productlist.ProductHelper.ProductDao;import bzu.edu.cn.productlist.R;/** * Created by Administrator on 2017/4/18. */public class ProductAdapter extends BaseAdapter {    private Context context;    private List<ProductBean> list;    private ProductDao productDao;    public ProductAdapter(Context context,List<ProductBean> list) {//构造方法        this.context = context;        this.list=list;    }    @Override    public int getCount() {        return list.size();//获取条目总数    }    @Override    public Object getItem(int position) {        return list.get(position);//根据位置获取对象    }    @Override    public long getItemId(int position) {        return position;//根据位置获取id    }    @NonNull    @Override    public View getView(int position, View convertView, ViewGroup parent) {        productDao=new ProductDao(context);
        //重用convertView        View view=convertView!=null?convertView:View.inflate(context,R.layout.product_item,null);
        //获取该视图的TextView        TextView IdTV = (TextView) view.findViewById(R.id.idTV);        TextView nameTV = (TextView) view.findViewById(R.id.nameTV);        TextView balanceTV = (TextView) view.findViewById(R.id.balanceTV);
        //获取当前位置的Product对象        final ProductBean pro=list.get(position);
        //为TextView赋值        IdTV.setText(pro.getId()+"");        nameTV.setText(pro.getName());        balanceTV.setText(pro.getBanlance()+"");        //获取ImageView控件        ImageView upIV= (ImageView) view.findViewById(R.id.upIV);        ImageView downIV= (ImageView) view.findViewById(R.id.downIV);        ImageView deleteIV= (ImageView) view.findViewById(R.id.deleteIV);        //向上箭头点击事件触发的方法        upIV.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                pro.setBanlance(pro.getBanlance()+1);//修改值                productDao.updateData(pro);//更新数据库                notifyDataSetChanged();//刷新界面            }        });        //向下箭头点击事件触发的方法        downIV.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                pro.setBanlance(pro.getBanlance()-1);                productDao.updateData(pro);                notifyDataSetChanged();            }        });        //删除图标点击事件触发的方法        deleteIV.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                //删除之前弹出对话框                android.content.DialogInterface.OnClickListener  listener=new android.content.DialogInterface.OnClickListener() {                    public void onClick(DialogInterface dialog, int which) {                        list.remove(pro);//从集合中移除                        productDao.deletedata(pro);//从数据库中删除                        notifyDataSetChanged();//刷新界面                    }                };                //创建对话框                AlertDialog.Builder builder=new AlertDialog.Builder(context);                builder.setTitle("确定要删除吗？");                builder.setPositiveButton("确定",listener);                builder.setNegativeButton("取消",null);                builder.show();            }        });        return view;    }}
7、界面交互代码MainActivity
package bzu.edu.cn.productlist;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.EditText;import android.widget.ImageView;import android.widget.ListView;import android.widget.Toast;import java.util.List;import bzu.edu.cn.productlist.Product.ProductBean;import bzu.edu.cn.productlist.ProductHelper.ProductDao;import bzu.edu.cn.productlist.ProductList.ProductAdapter;public class MainActivity extends AppCompatActivity {    private EditText EdName;    private EditText EdBalance;    private ImageView IvAdd;    private ListView listView;    private ProductDao productDao;    private List<ProductBean> list;    private ProductAdapter productAdapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);
        //初始化控件        EdName= (EditText) findViewById(R.id.EdName);        EdBalance=(EditText)findViewById(R.id.EdBalance);        IvAdd=(ImageView)findViewById(R.id.IVAdd);        listView= (ListView) findViewById(R.id.lv_product);
        //创建ProductDao对象        productDao=new ProductDao(this);
        //查询所有记录        list=productDao.queryData();        //创建适配器        productAdapter=new ProductAdapter(this,list);        listView.setAdapter(productAdapter);
        //添加监听器，监听条目点击事件        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                ProductBean productBean= (ProductBean) parent.getItemAtPosition(position);                Toast.makeText(MainActivity.this,productBean.toString(),Toast.LENGTH_LONG).show();            }        });    }    //点击加号所触发的事件    public void addProduct(View view){        String pname=EdName.getText().toString();        String pbalance=EdBalance.getText().toString();        if(pname.equals("")&&pbalance.equals("")){//判断是否为空，为空弹出Toast            Toast.makeText(this,"商品名称和金额不能为空",Toast.LENGTH_LONG).show();        }else{            ProductBean productBean=new ProductBean();            productBean.setName(pname);            productBean.setBanlance(Integer.parseInt((pbalance)));//类型转换            productDao.addData(productBean);//插入数据库            list.add(productBean);//插入集合        }        productAdapter.notifyDataSetChanged();//刷新界面        listView.setSelection(listView.getCount()-1);//选中最后一个        EdName.setText("");        EdBalance.setText("");    }}
运行结果图

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