On methods developed under android chat software and design ideas

I am a novice android, want to practice your hand chat software developed under an android, because just contact android, it is not very clear on many issues, and I hope prawn can communicate and exchange ideas about how the whole design realization, I just have some The idea, however vague, an implementation method should be used to implement socket programming; There is via XMPP protocol (which I am not very clear), hoping Which prawn pointing pointing me grateful.<-! Main posts under Banner (D4) -><-! Posts under the main text (D5) ->
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This comes to network programming it, it looks like the use of TCP, you can search the source code to see what those instances, I have a Xiangnong continue to learn it.
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Via Bluetooth or wifi wap and other? But the opportunities are the socket
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I do not know want to have wifi or bluetooth server mechanism.
Mobile side, then I think that is needed to complete: display information. Locally saved information. New request information. Send a message.
I do not know all the information saved to the local words. Okay