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来源：互联网发布：js改变div文字编辑：程序博客网时间：2024/05/16 22:28

商品展示用户交互界面：

<?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="com.example.bz0209.showshopdemo.MainActivity">    <LinearLayout        android:id="@+id/addLL"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal">        <EditText            android:id="@+id/nameET"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:hint="商品名称"            android:inputType="textPersonName"            />        <EditText            android:id="@+id/balanceET"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:hint="金额"            android:inputType="number"            />        <ImageView            android:onClick="add"            android:id="@+id/addIV"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:src="@android:drawable/ic_input_add"            />        <ListView            android:id="@+id/accountLV"            android:layout_width="match_parent"            android:layout_height="match_parent"            android:layout_below="@+id/addLL">        </ListView>    </LinearLayout>></LinearLayout>

添加了三个TextView用于展示数据库中的某条数据的id、商品名称、金额：![这里写图片描述](http://img.blog.csdn.net/20170508210800571?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvcXFfMzc3MzgyMTg=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)

<TextView    android:id="@+id/tvId"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_weight="1"    android:text="1"    android:textColor="#000000"    android:textSize="20sp" /><TextView    android:id="@+id/tvName"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_weight="2"    android:text="商品名称"    android:textColor="#000000"    android:textSize="20sp" /><TextView    android:id="@+id/tvAmount"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_weight="2"    android:text="金额"    android:textColor="#000000"    android:textSize="20sp" /><LinearLayout    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:orientation="vertical">    <ImageView        android:id="@+id/ivUp"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginBottom="2dp"        android:src="@android:drawable/arrow_up_float"/>    <ImageView        android:id="@+id/ivDown"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:src="@android:drawable/arrow_down_float"/></LinearLayout><ImageView    android:id="@+id/ivDelete"    android:layout_width="25dp"    android:layout_height="25dp"    android:src="@android:drawable/ic_menu_delete" />

![这里写图片描述](http://img.blog.csdn.net/20170508210404487?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvcXFfMzc3MzgyMTg=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)![这里写图片描述](http://img.blog.csdn.net/20170508210610615?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvcXFfMzc3MzgyMTg=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)创建数据库：

DBHelper.java:

package com.example.bz0209.showshopdemo.db;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

/**
* Created by Administrator on 2017/4/28.
*/

public class DBHelper extends SQLiteOpenHelper {
public static final String CREATE_GOODS=”create table goods(id integer primary key autoincrement,name varchar(20),amount(integer)”;
public DBHelper(Context context, int version) {

    super(context, "goods.db", null, version);}@Overridepublic void onCreate(SQLiteDatabase db) {    db.execSQL(CREATE_GOODS);}@Overridepublic void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {}

}

界面显示如：![这里写图片描述](http://img.blog.csdn.net/20170508210655211?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvcXFfMzc3MzgyMTg=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)

GoodsAdapter.java:

package com.example.bz0209.showshopdemo.entity;

import android.content.Context;
import android.support.annotation.NonNull;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.bz0209.showshopdemo.R;

import java.util.List;

/**
* Created by Administrator on 2017/4/28.
*/

public class GoodsAdapter extends ArrayAdapter{
private int resounceId;
public GoodsAdapter(Context context, int resource, List objects) {
super(context, resource, objects);
resounceId=resource;

}@NonNull@Overridepublic View getView(int position, View convertView, ViewGroup parent) {    Goods goods=getItem(position);    View view=null;    ViewHolder viewHolder;    if (convertView==null){        view= LayoutInflater.from(getContext()).inflate(resounceId,null);        viewHolder=new ViewHolder();        viewHolder.tvName= (TextView) view.findViewById(R.id.tvName);        viewHolder.tvId= (TextView) view.findViewById(R.id.tvId);        viewHolder.tvAmount= (TextView) view.findViewById(R.id.tvAmount);        viewHolder.ivUp=(ImageView)view.findViewById(R.id.ivUp);        viewHolder.ivDown=(ImageView)view.findViewById(R.id.ivDown);        viewHolder.ivDelete=(ImageView)view.findViewById(R.id.ivDelete);        view.setTag(viewHolder);    }else{        view=convertView;        viewHolder=(ViewHolder)view.getTag();    }    viewHolder.tvId.setText(goods.getId()+"");    viewHolder.tvName.setText(goods.getName());    viewHolder.tvAmount.setText(goods.getAmount()+"");    return view;}class ViewHolder{    TextView tvId;    TextView tvName;    TextView tvAmount;    ImageView ivUp;    ImageView ivDown;    ImageView ivDelete;}

}

package com.example.bz0209.showshopdemo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.ListView;

import com.example.bz0209.showshopdemo.dao.GoodsDao;
import com.example.bz0209.showshopdemo.entity.Goods;
import com.example.bz0209.showshopdemo.entity.GoodsAdapter;

import java.util.List;

public class MainActivity extends AppCompatActivity {
private EditText etName;
private EditText etAmount;
private ListView lvGoods;
private GoodsAdapter goodsAdapter;
private GoodsDao goodsDao;
private List goodsList;

@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    etName=(EditText)findViewById(R.id.etName);    etAmount=(EditText)findViewById(R.id.etAmount);    lvGoods=(ListView)findViewById((R.id.lvGoods));    goodsDao=new GoodsDao(this);    goodsList=goodsDao.queryAll();    goodsAdapter=new GoodsAdapter(this,R.layout.item,goodsList);    lvGoods.setAdapter(goodsAdapter);}public void addGoods(View view){    String name=etName.getText().toString();    String amount=etAmount.getText().toString();    Goods goods=new Goods(name,amount.equals("")?0:Integer.parseInt(amount));    goodsDao.add(goods);}

}

![这里写图片描述](http://img.blog.csdn.net/20170508210850821?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvcXFfMzc3MzgyMTg=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)

package com.example.bz0209.showshopdemo.dao;

import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;

import com.example.bz0209.showshopdemo.db.DBHelper;
import com.example.bz0209.showshopdemo.entity.Goods;

/**
* Created by Administrator on 2017/4/28.
*/

public class GoodsDao {
private DBHelper dbHelper;
public GoodsDao(Context context){
dbHelper=new DBHelper(context,1);
}
public void add(Goods goods){
SQLiteDatabase sqLiteDatabase=dbHelper.getWritableDatabase();
ContentValues values=new ContentValues();
values.put(“name”,goods.getName());
values.put(“amount”,goods.getAmount());
sqLiteDatabase.insert(“goods”,null,values);
sqLiteDatabase.close();
}
}

package com.example.bz0209.showshopdemo.entity;

/**
* Created by Administrator on 2017/4/28.
*/

public class Goods {
private Long id;
private String name;
private Integer amount;

public Goods(Long id, String name, Integer amount) {    this.id = id;    this.name = name;    this.amount = amount;}public Goods(String name, Integer amount) {    this.name = name;    this.amount = amount;}public Long getId() {    return id;}public void setId(Long id) {    this.id = id;}public String getName() {    return name;}public void setName(String name) {    this.name = name;}public Integer getAmount() {    return amount;}public void setAmount(Integer amount) {    this.amount = amount;}@Overridepublic String toString() {    return "Goods{" +            "id=" + id +            ", name='" + name + '\'' +            ", amount=" + amount +            '}';}

}

“`

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