如何实现GMail Android App listview动画？

In the new update of the Gmail App, there is a very cool animation implemented. If I click a mail from the inbox listview, the item's text slides upto the top and becomes heading of the next page where the entire mail is shown, when I press back, the whole email collapses to the very same spot (i.e at very same index in the inbox listview). It looks pretty cool, I haven't been able to figure out how are they doing it, any idea?In the new update of the Gmail App, there is a