ListView显示网络图片

1.http://mobile.51cto.com/android-266971.htm
2.http://www.cnblogs.com/xiaoxiaoboke/archive/2011/06/24/2089035.html
3.http://www.eoeandroid.com/thread-22678-1-1.html
一般解析xml后获得图片地址，需要显示到ImageView中，

public Bitmap getBitmap(){   
Bitmap mBitmap = null;   
try {   
URL url = new URL(imageUrl);   
HttpURLConnection conn = (HttpURLConnection) url.openConnection();   
InputStream is = conn.getInputStream();   
mBitmap = BitmapFactory.decodeStream(is);   
} catch (MalformedURLException e) {   
e.printStackTrace();   
} catch (IOException e) {   
e.printStackTrace();   
}   
return mBitmap;   
}