Facebook unity SDK, "FB.Init() has already been called" - facebook

Question

I am working with FB Unity SDK, and one constant problem i am facing is to check if FB.Init() has already been called.
Scenario:
There is a fb connect button, user clicks it.
If the user decides to cancel the dialog and click "Fb connect again"
FB sdk throws a notice saying "FB.Init() has already been called. You need to call this only once."
Here is what i am trying to do, but does'nt work
if(FB.AccessToken=="" || FB.AccessToken==null){
Debug.Log ("Fb not init(), call it");
FB.Init(OnInitComplete, null);
}else{
Debug.Log ("Facebook already init()");
OnInitComplete();
}
But, obviously this is not working since FB.Init() was called and the user cancelled it. How can i verify if FB.Init() has already been called? But i was expecting accessToken to be null?
And, do these messages effect the submission of the app? Will they be displayed in the production build?

Answer 1

FB.Init() shouldn't be called more than once. This is by design (because it inits Facebook GameObjects and such within Unity). Instead, do this:
FB.Init(MyOnInitComplete);
....
public void MyOnInitComplete() {
// FB.IsLoggedIn checks for the FB.AccessToken and the FB.UserId
if(!FB.IsLoggedIn){
// FB.Init() is called, but user is still not logged in.
FB.Login("<your_permissions_here>");
} else {
// User is logged in & FB.Init is called
}
}