Android Facebook SDK: Check if the user is logged in or not

Facebook SDK 4.x versions have a different method now:

boolean loggedIn = AccessToken.getCurrentAccessToken() != null;

or

by using functions

boolean loggedIn;
//...
loggedIn = isFacebookLoggedIn();
//...
public boolean isFacebookLoggedIn(){
    return AccessToken.getCurrentAccessToken() != null;
}

Check this link for better reference https://developers.facebook.com/docs/facebook-login/android
check this heading too “Access Tokens and Profiles” it says “You can see if a person is already logged in by checking AccessToken.getCurrentAccessToken() and Profile.getCurrentProfile()