Android 购物商城界面

时间:2022-05-28 DY.memory 人气:0

activity_main.xml

在res/layout文件中，放置一个TextView控件用于显示购物商城界面的标题，放置一个ListView控件用于显示购物商场界面的列表

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical">
 
    <TextView
        android:layout_width="match_parent"
        android:layout_height="45dp"
        android:text="购物商城"
        android:textSize="18sp"
        android:textColor="#FFFFFF"
        android:background="#FF8F03"
        android:gravity="center"/>
 
    <ListView
        android:id="@+id/lv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:listSelector="@color/colorAccent" />
 
</LinearLayout>

list_Item.xml

在res/layout文件中创建一个列表条目界面的布局文件list_item.xml,在该文件中放置一个Image View控件用于显示商品的图片；放置2个TextView控件分别用于显示商品的名称和价格！

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp">
    <ImageView
        android:id="@+id/iv"
        android:layout_width="120dp"
        android:layout_height="90dp"
        android:layout_centerVertical="true" />
    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_marginLeft="10dp"
        android:layout_toRightOf="@+id/iv">
        <TextView
            android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="桌子"
            android:textColor="#000000"
            android:textSize="20sp" />
        <TextView
            android:id="@+id/tv_price"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/title"
            android:layout_marginTop="10dp"
            android:text="价格："
            android:textColor="#FF8F03"
            android:textSize="20sp" />
        <TextView
            android:id="@+id/price"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/title"
            android:layout_marginTop="10dp"
            android:layout_toRightOf="@+id/tv_price"
            android:text="1000"
            android:textColor="#FF8F03"
            android:textSize="20sp" />
    </RelativeLayout>
</RelativeLayout>

MainActivity.java

12-14行代码定义了数组titles，prices，icons，分别用于存储商品列表中的商品名称，价格和图片，并且3个数组的长度一致。

19行创建MyBaseAdpter的实例

20行设置数据适配器List View上

23-34行代码返回条目的长度，价格，数据对象

37行找到list_item.xml中创建的TextView控件

创建一个View Holder类，将需要加载的控件变量放在该类中

最后调用id属性，set实现！

package com.example.dymemory1;
 
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
 
 
public class MainActivity extends Activity {
    private ListView mListView;
    private  String[] titles = {"苹果","蛋糕","修罗壁纸","桌子","猕猴桃","毛衣"};
    private  String[] prices = {"10元/kg","100元/个","50元/张","45元/把","10元/kg","110元/件"};
 
    private int[] icons = {R.drawable.apple,R.drawable.cake,R.drawable.juyoujing,R.drawable.table,R.drawable.kiwifruit,R.drawable.wireclothes};
 
    protected  void onCreate(Bundle saveInstanceState){
        super.onCreate(saveInstanceState);
        setContentView(R.layout.activity_main);
 
        mListView=(ListView)findViewById(R.id.lv);
 
        MyBaseAdaPter mAdapter = new MyBaseAdaPter();
 
        mListView.setAdapter(mAdapter);
    }
    class MyBaseAdaPter extends  BaseAdapter{
        @Override
        public int getCount( ){
            return  titles.length;
        }
        @Override
        public Object getItem(int position){
            return titles[position];
        }
        @Override
        public long getItemId(int position){
            return  position;
        }
        @Override
        public View getView(int position,View convertView,ViewGroup parent){
            ViewHolder holder =null;
            if(convertView == null){
                convertView = View.inflate( MainActivity.this,R.layout.list_item,null);
                holder= new ViewHolder();
                holder.title=(TextView) convertView.findViewById(R.id.title);
                holder.price=(TextView) convertView.findViewById(R.id.price);
                holder.iv=(ImageView) convertView.findViewById(R.id.iv);
                convertView.setTag(holder);
            }
            else {
                holder = (ViewHolder) convertView.getTag();
            }
            holder.title.setText(titles[position]);
            holder.price.setText(prices[position]);
            holder.iv.setBackgroundResource(icons[position]);
            return  convertView;
        }
    }
    static class ViewHolder{
        TextView title;
        TextView price;
        ImageView iv;
    }
}

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