Android : Android - How to parse an XML with colon in tags?

I have an XML file like this :

<item>  
  <title>...</title>  
  <link>...</link>    
  <pubDate>...</pubDate>
  <description>...</description>
  <media:content url=" ....." type="image/jpg" medium="image" height="270" width="480" />
</item

I want to get url in media:content tag.But I don't know how to do this? Please help me! Thanks and best regard!!!