android - 在列表视图中平滑滚动

Question

在我的应用程序中，我有一个列表视图..每一行都包含一个图像和一个相对布局的文本视图..一切都完成了..但是列表视图的滚动不如原生“联系人列表”那么流畅。我认为问题出在 getview (),y 因为在这种方法中我有一个“HTTP”调用和位图图像加载..有没有办法做到这一点..请帮助我..提前谢谢..

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;    
    }