retrieving the user facebook information on my android application

I've integrated facebook in my android application using facebook sdk and succeded to do a login from my app.Next I wanna retrieve on my android application all this user's personal information(Info).But I haven't found any tutorials on that, yet.Can someone give me a hint of how I should proceed?Thank you:)

EDIT: As I understand from there this is the way how the requests for friends/user information should be done. But there is something I don't understand....Is this method called automaticaly after I logg in?????

 Bundle params = new Bundle();
 String accessToken = facebook.getAccessToken();
try
{
        params.putString("format", "json");
        params.putString("access_token", accessToken);

        String url = "https://graph.facebook.com/"+Id;

        ......
}

This is the way I logg in:

    tweet.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            postMessage();

        }
    });

I have a button tweet and a listener that calls for my method that looks like this:

public void postMessage() {

    if (facebookConnector.getFacebook().isSessionValid()) {
        postMessageInThread();
   开发者_Go百科 } else {
        SessionEvents.AuthListener listener = new SessionEvents.AuthListener() {

            @Override
            public void onAuthSucceed() {
                postMessageInThread();
            }

            @Override
            public void onAuthFail(String error) {

            }
        };
        SessionEvents.addAuthListener(listener);
        facebookConnector.login();
    }
}

Question:First I definitly have to logg in and after that to retrieve the information/friends list and so on.....but where should I call for this methods??This is extremly unclear to me....are they called automaticaly after I logg in?

---

You have to call the Graph API on Facebook, it'll return JSON to you with the infos you need
Read the paragraph called "Calling the graph API" here : http://developers.facebook.com/docs/guides/mobile/#android and follow the links