將Facebook個人資料圖片設置爲ListView中的ImageView

我得到了這個應用程序，它將用戶的Facebook ID記錄在MySQL表中，現在我試圖獲取此ID並在ListView上顯示用戶的個人資料圖片，但我不知道我做錯了什麼。將Facebook個人資料圖片設置爲ListView中的ImageView

我定製ArrayAdapter：

public class VisualAdapter extends ArrayAdapter<String> { 

private final Context contexto; 

private final String[] comics, username, userid; 

URL img_url = null; 

Bitmap bm; 

public VisualAdapter(Context contexto, String[] comics, String[] username, 
     String[] userid) { 
    super(contexto, R.layout.exibeimg, comics); 
    this.contexto = contexto; 
    this.comics = comics; 
    this.username = username; 
    this.userid = userid; 
} 

public View getView(int position, View convertView, ViewGroup parent) { 
    // TODO Auto-generated method stub 
    LayoutInflater inflater = (LayoutInflater) contexto 
      .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 

    View rowView = inflater.inflate(R.layout.exibeimg, parent, false); 
    TextView textView = (TextView) rowView.findViewById(R.id.tvTitleImage); 
    ImageView imageView = (ImageView) rowView.findViewById(R.id.ivImageVisual); 
    ImageView ivUser = (ImageView) rowView.findViewById(R.id.ivUser); 
    TextView tvUser = (TextView) rowView.findViewById(R.id.tvUserNAME); 
    textView.setText(comics[position]); 
    tvUser.setText(username[position]); 

    try { 
     img_url = new URL("http://graph.facebook.com/"+userid+"/picture?type=thumbnail"); 
     bm = BitmapFactory.decodeStream(img_url.openConnection().getInputStream()); 
     ivUser.setImageBitmap(bm); 
    } 
    catch (Exception e) { 
     e.printStackTrace(); 
    } 
    return rowView; 
} 

}

的logcat：http://pastebin.com/kmLXKvZJ

此外，這是一個選項卡中。它在Tab 2中，當應用程序從Tab 1開始，當我點擊Tab 2（查看此列表）時，加載需要幾秒鐘，有什麼我可以做的更快地加載它？

來源

2012-08-28 Victor Santiago