FB SDK 4.0 for Android: User still logged even the permission was removed?

Question

I'm creating an app that implements a Facebook Login and i'm having problems with one scenario:

Step#1 - User logs into my app with FB login.
Step#2 - The user removes the permission for my app on FB web.
Step#3 - The user opens my app and it's still logged.

According to their docs:

Your app can only have one person at a time logged in and LoginManager sets the current AccessToken and Profile for that person.
The FacebookSDK saves this data in shared preferences and sets it during SDK initialization. You can see if a person is already logged in by checking AccessToken.getCurrentAccessToken() and Profile.getCurrentProfile().

AccessToken.getCurrentAccessToken() and Profile.getCurrentProfile() won't be null because the user logged once.

But if the SDK saves the datas in shared preferences, i can't figure it out how i will know if the user removed the permission?

I watched the How to check if user is logged in with FB SDK 4.0 for Android? but the solution doesn't work because doesn't makes no sense and at least i tried to use it..

Answer 1

If you do a graph call, the SDK will figure out that the permissions are removed/changed and adjust the access token accordingly.