Android：如何在ListView中顯示圖像？

Android的：如何在一個ListView顯示來自Web的圖片，我有以下代碼從URL中的ImageView的顯示圖像：Android：如何在ListView中顯示圖像？

import java.io.IOException; 
import java.io.InputStream; 
import java.net.HttpURLConnection; 
import java.net.URL; 
import java.net.URLConnection; 

import android.app.ListActivity; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.os.Bundle; 
import android.widget.ImageView; 

public class HttpImgDownload extends ListActivity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     Bitmap bitmap = 
      // DownloadImage(
      // "http://www.streetcar.org/mim/cable/images/cable-01.jpg"); 

      DownloadImage(
     "http://s.twimg.com/a/1258674567/images/default_profile_3_normal.png"); 
     ImageView img = (ImageView) findViewById(R.id.img); 
     img.setImageBitmap(bitmap); 

    } 

    private InputStream OpenHttpConnection(String urlString) 
    throws IOException 
    { 
     InputStream in = null; 
     int response = -1; 

     URL url = new URL(urlString); 
     URLConnection conn = url.openConnection(); 

     if (!(conn instanceof HttpURLConnection))      
      throw new IOException("Not an HTTP connection"); 

     try{ 
      HttpURLConnection httpConn = (HttpURLConnection) conn; 
      httpConn.setAllowUserInteraction(false); 
      httpConn.setInstanceFollowRedirects(true); 
      httpConn.setRequestMethod("GET"); 
      httpConn.connect(); 

      response = httpConn.getResponseCode();     
      if (response == HttpURLConnection.HTTP_OK) { 
       in = httpConn.getInputStream();         
      }      
     } 
     catch (Exception ex) 
     { 
      throw new IOException("Error connecting");    
     } 
     return in;  
    } 


    private Bitmap DownloadImage(String URL) 
    {   
     Bitmap bitmap = null; 
     InputStream in = null;   
     try { 
      in = OpenHttpConnection(URL); 
      bitmap = BitmapFactory.decodeStream(in); 
      in.close(); 
     } catch (IOException e1) { 
      // TODO Auto-generated catch block 
      e1.printStackTrace(); 
     } 
     return bitmap;     
    } 
}

現在，我怎麼在列表視圖的陣列顯示圖像？以下是我想要顯示的圖像：http://sites.google.com/site/androideyecontact/_/rsrc/1238086823282/Home/android-eye-contact-lite/eye_contact-list_view_3.png?height=420&width=279

這就是我想出了：

import java.io.IOException; 
import java.io.InputStream; 
import java.net.HttpURLConnection; 
import java.net.URL; 
import java.net.URLConnection; 




import android.app.Activity; 
import android.os.Bundle; 
import android.app.ListActivity; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.view.View; 
import android.view.ViewGroup; 
import android.view.LayoutInflater; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.ImageView; 
import android.widget.ListView; 
import android.widget.TextView; 

public class ImageFromWeb extends ListActivity { 
    /** Called when the activity is first created. */ 
    TextView selection; 
    Bitmap bitmap; 
    String[] items={"lorem", "ipsum", "dolor", "sit", "amet", 
        "consectetuer", "adipiscing", "elit", "morbi", "vel", 
        "ligula", "vitae", "arcu", "aliquet", "mollis", 
        "etiam", "vel", "erat", "placerat", "ante", 
        "porttitor", "sodales", "pellentesque", "augue", 
        "purus"}; 

    @Override 
    public void onCreate(Bundle icicle) { 
     super.onCreate(icicle); 
     setContentView(R.layout.main); 

    bitmap = 
      DownloadImage(
      "http://www.streetcar.org/mim/cable/images/cable-01.jpg"); 

      //DownloadImage(
     // "http://s.twimg.com/a/1258674567/images/default_profile_3_normal.png"); 
     //ImageView img = (ImageView) findViewById(R.id.img); 
     //icon.setImageBitmap(bitmap); 
     //icon 

     // ImageView icon=(ImageView)row.findViewById(R.id.icon); 

     //setListAdapter(new IconicAdapter()); 
     //selection=(TextView)findViewById(R.id.selection); 
    } 

    private InputStream OpenHttpConnection(String urlString) 
    throws IOException 
    { 
     InputStream in = null; 
     int response = -1; 

     URL url = new URL(urlString); 
     URLConnection conn = url.openConnection(); 

     if (!(conn instanceof HttpURLConnection))      
      throw new IOException("Not an HTTP connection"); 

     try{ 
      HttpURLConnection httpConn = (HttpURLConnection) conn; 
      httpConn.setAllowUserInteraction(false); 
      httpConn.setInstanceFollowRedirects(true); 
      httpConn.setRequestMethod("GET"); 
      httpConn.connect(); 

      response = httpConn.getResponseCode();     
      if (response == HttpURLConnection.HTTP_OK) { 
       in = httpConn.getInputStream();         
      }      
     } 
     catch (Exception ex) 
     { 
      throw new IOException("Error connecting");    
     } 
     return in;  
    } 


    private Bitmap DownloadImage(String URL) 
    {   
     Bitmap bitmap = null; 
     InputStream in = null;   
     try { 
      in = OpenHttpConnection(URL); 
      bitmap = BitmapFactory.decodeStream(in); 
      in.close(); 
     } catch (IOException e1) { 
      // TODO Auto-generated catch block 
      e1.printStackTrace(); 
     } 
     return bitmap;     
    } 

    public void onListItemClick(ListView parent, View v, 
                  int position, long id) { 
     selection.setText(items[position]); 
    } 

    class IconicAdapter extends ArrayAdapter { 
     IconicAdapter() { 
      super(ImageFromWeb.this, R.layout.row, items); 
     } 

     public View getView(int position, View convertView, 
               ViewGroup parent) { 
      LayoutInflater inflater=getLayoutInflater(); 
      View row=inflater.inflate(R.layout.row, parent, false); 
      TextView label=(TextView)row.findViewById(R.id.label); 

      label.setText(items[position]); 

      ImageView icon=(ImageView)row.findViewById(R.id.icon); 

      //if (items[position].length()>4) { 
       //icon.setImageResource(R.drawable.delete); 
       //icon.setI 
       icon.setImageBitmap(bitmap); 

      //} 
      //else { 
       //icon.setImageResource(R.drawable.ok); 
      //} 

      return(row); 
     } 
    } 


}

main.xml中

<TextView 
    android:id="@+id/selection" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"/> 
<ListView 
    android:id="@android:id/list" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:drawSelectorOnTop="false" 
    >

個

row.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:orientation="horizontal" 
> 
    <ImageView 
     android:id="@+id/icon" 
     android:layout_width="22px" 
     android:paddingLeft="2px" 
     android:paddingRight="2px" 
     android:paddingTop="2px" 
     android:layout_height="wrap_content" 

    /> 
    <TextView 
     android:id="@+id/label" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textSize="40sp" 
    /> 
</LinearLayout>

但圖像不是從網站顯示的。這段代碼的順序有問題。有人能整理出來嗎？

來源

2010-04-14 Muhammad Maqsoodur Rehman