Facebook authentication without login button

Question

I have followed some Facebook API 3.0 tutorials, including the Login/Logout and the Publish To Feed examples. So the login works this way:

1. App opens, shows a f

Answer 1

Something like this

private void performFacebookLogin()
{
    Log.d("FACEBOOK", "performFacebookLogin");
    final Session.NewPermissionsRequest newPermissionsRequest = new Session.NewPermissionsRequest(this, Arrays.asList("email"));
    Session openActiveSession = Session.openActiveSession(this, true, new Session.StatusCallback()
    {
        @Override
        public void call(Session session, SessionState state, Exception exception)
        {
            Log.d("FACEBOOK", "call");
            if (session.isOpened() && !isFetching)
            {
                Log.d("FACEBOOK", "if (session.isOpened() && !isFetching)");
                isFetching = true;
                session.requestNewReadPermissions(newPermissionsRequest);
                Request getMe = Request.newMeRequest(session, new GraphUserCallback()
                {
                    @Override
                    public void onCompleted(GraphUser user, Response response)
                    {
                        Log.d("FACEBOOK", "onCompleted");
                        if (user != null)
                        {
                            Log.d("FACEBOOK", "user != null");
                            org.json.JSONObject graphResponse = response.getGraphObject().getInnerJSONObject();
                            String email = graphResponse.optString("email");
                            String id = graphResponse.optString("id");
                            String facebookName = user.getUsername();
                            if (email == null || email.length() < 0)
                            {
                                Logic.showAlert(
                                        ActivityLogin.this,
                                        "Facebook Login",
                                        "An email address is required for your account, we could not find an email associated with this Facebook account. Please associate a email with this account or login the oldskool way.");
                                return;
                            }
                        }
                    }
                });
                getMe.executeAsync();
            }
            else
            {
                if (!session.isOpened())
                    Log.d("FACEBOOK", "!session.isOpened()");
                else
                    Log.d("FACEBOOK", "isFetching");

            }
        }
    });

Actually exactly like that. It works perfectly fine for me.