在列表视图中平滑滚动

在我的应用程序中，我有一个列表视图。每行包含一个图像和相对布局的textview ..一切都完成了..但是listview没有像原生的“联系人列表”滚动那么平滑。我认为问题在于getview（），因为在这种方法中我有一个“HTTP”调用和位图图像加载..是否有无论如何这样做..请帮助我..提前感谢..在列表视图中平滑滚动

我的Getview方法：

public View getView(int position, View convertView, ViewGroup parent) 
    { 
     // TODO Auto-generated method stub  
     Bitmap bitmap = DownloadImage(
       kickerimage[position]);   
//  View listView = convertView; 
     ViewHolder holder; 
     if (convertView == null) 
      { 
       //this should only ever run if you do not get a view back    
      LayoutInflater inflater = (LayoutInflater) contxt 
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = inflater.inflate(R.layout.homelistrow, null); 

      holder = new ViewHolder(); 

      holder.image = (ImageView) convertView 
         .findViewById(R.id.icon); 
      holder.image.setImageBitmap(bitmap); 

      holder.text = (TextView) convertView 
         .findViewById(R.id.name_label); 
      holder.text.setText(itemsarray[position]); 
      } 
    return convertView ;   
    } 

private Bitmap DownloadImage(String URL) 
    {   
//  System.out.println("image inside="+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(); 
     } 
//  System.out.println("image last"); 
     return 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;  
    }

来源

2012-12-07 Subburaj