Android chat application-xml layout

[dqknxdp8]

I am making a chat application for Android. How should be the chat screen? Can anyone tell me what all views should I use in XML layout? Is it an edittext and a listview? Pls help. I need to make a chat screen like the one we see in Gtalk. The chat messages of both persons should be aligned to opposite sides of the screen(see Gtalk chat box align style).this is what I want..How can I implement this layout?http://upload.wikimedia.org/wikipedia/en/7/75/Google_talk.gif