[android] 练习使用ListView（一）详解手机开发

package com.android.test; 
 
import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.ListAdapter; 
import android.widget.ListView; 
import android.widget.TextView; 
 
public class MainActivity extends Activity { 
    private ListView lv_images; 
 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.activity_main); 
        lv_images = (ListView) findViewById(R.id.lv_images); 
        ListAdapter adapter = new ImageAdapter(); 
        lv_images.setAdapter(adapter); 
    } 
    /** 
     * 适配器 
     * @author taoshihan 
     * 
     */ 
    class ImageAdapter extends BaseAdapter { 
 
        @Override 
        public View getView(int position, View convertView, ViewGroup parent) { 
            String url=(String) getItem(position); 
            View view; 
            if(convertView!=null){ 
                view=convertView; 
            }else{ 
                view=View.inflate(getApplicationContext(), R.layout.image_item, null); 
            } 
            TextView tv_image=(TextView) view.findViewById(R.id.tv_image); 
             
            tv_image.setText(url); 
            return view; 
        } 
 
        @Override 
        public int getCount() { 
            // TODO Auto-generated method stub 
            return Images.IMAGE_URLS.length; 
        } 
 
        @Override 
        public Object getItem(int position) { 
            return Images.IMAGE_URLS[position]; 
        } 
 
        @Override 
        public long getItemId(int position) { 
            // TODO Auto-generated method stub 
            return position; 
        } 
 
    } 
    static class Images{ 
        public final static String[] IMAGE_URLS = new String[]{ 
            "http://img.my.csdn.net/uploads/201508/05/1438760758_3497.jpg",     
            "http://img.my.csdn.net/uploads/201508/05/1438760758_6667.jpg",   
            "http://img.my.csdn.net/uploads/201508/05/1438760757_3588.jpg",   
            "http://img.my.csdn.net/uploads/201508/05/1438760756_3304.jpg",   
            "http://img.my.csdn.net/uploads/201508/05/1438760755_6715.jpeg",   
            "http://img.my.csdn.net/uploads/201508/05/1438760726_5120.jpg",   
            "http://img.my.csdn.net/uploads/201508/05/1438760726_8364.jpg",   
            "http://img.my.csdn.net/uploads/201508/05/1438760725_4031.jpg",   
            "http://img.my.csdn.net/uploads/201508/05/1438760724_9463.jpg",   
            "http://img.my.csdn.net/uploads/201508/05/1438760724_2371.jpg",   
            "http://img.my.csdn.net/uploads/201508/05/1438760707_4653.jpg" 
        }; 
    } 
}

<?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="wrap_content" 
    android:orientation="vertical"> 
    <ListView  
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:id="@+id/lv_images"></ListView> 
</LinearLayout>

<?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="wrap_content" 
    android:orientation="vertical" > 
 
    <TextView 
        android:id="@+id/tv_image" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content"/> 
 
</LinearLayout>