Android Facebook SDK：检查用户是否登录

Question

I'm have a feature on my Android app where the user authorizes the app and shares a link.

I also need to give an option for the user to logout of facebook and I need to conditionally disable this button if the user is not logged int (or not authorized the app).

I can't seem to find the API call on the Android SDK that would let me ask FB if the user is logged in or not.

What I have found is getAccessExpires() :

Retrieve the current session's expiration time (in milliseconds since Unix epoch), or 0 if the session doesn't expire or doesn't exist.

Will checking if the session equals 0 be the way to go? Or is there something I'm missing?

Answer 1

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()

Answer 2

I struggled to find a simple answer to this in the FB docs. Using the Facebook SDK version 3.0 I think there are two ways to check if a user is logged in.

1) Use Session.isOpened()

To use this method you need to retrieve the active session with getActiveSession() and then (here's the confusing part) decipher if the session is in a state where the user is logged in or not. I think the only thing that matters for a logged in user is if the session isOpened() . So if the session is not null and it is open then the user is logged in. In all other cases the user is logged out (keep in mind Session can have states other than opened and closed).

public boolean isLoggedIn() {
    Session session = Session.getActiveSession();
    return (session != null && session.isOpened());
}

There's another way to write this function, detailed in this answer , but I'm not sure which approach is more clear or "best practice".

2) Constantly monitor status changes with Session.StatusCallback and UiLifecycleHelper

If you follow this tutorial you'll setup the UiLifecycleHelper and register a Session.StatusCallback object with it upon instantiation. There's a callback method, call() , which you override in Session.StatusCallback which will supposedly be called anytime the user logs in/out. Within that method maybe you can keep track of whether the user is logged in or not. Maybe something like this:

private boolean isLoggedIn = false; // by default assume not logged in

private Session.StatusCallback callback = new Session.StatusCallback() {
    @Override
    public void call(Session session, SessionState state, Exception exception) {
        if (state.isOpened()) { //note: I think session.isOpened() is the same
            isLoggedIn = true;
        } else if (state.isClosed()) {
            isLoggedIn = false;
        }
    }
};

public boolean isLoggedIn() {
    return isLoggedIn;
}

I think method 1 is simpler and probably the better choice.

As a side note can anyone shed light on why the tutorial likes to call state.isOpened() instead of session.isOpened() since both seem to be interchangeable ( session.isOpened() seems to just call through to the state version anyway).

Answer 3

Note to readers: This is now deprecated in the new FB 3.0 SDK.

facebook.isSessionValid() returns true if user is logged in, false if not.

Answer 4

Session.getActiveSession().isOpened()

如果用户已登录，则返回 true，否则返回 false

Answer 5

Android Studio with :

compile 'com.facebook.android:facebook-android-sdk:4.0.1'

then check login like as:

private void facebookPost() {
    //check login
    AccessToken accessToken = AccessToken.getCurrentAccessToken();
    if (accessToken == null) {
        Log.d(TAG, ">>>" + "Signed Out");
    } else {
        Log.d(TAG, ">>>" + "Signed In");
    }
}

Answer 6

@diljeet was right. https://stackoverflow.com/a/29375963/859330

In addition, use

return AccessToken.getAccessToken() != null && Profile.getCurrentProfile()!=null;

It always works this way.

Answer 7

For Facebook Android SDK 4.x you have to use the "AccessToken.getCurrentAccessToken()" as said by @Diljeet but his check didn't work for me, I finally checked it by doing:

Activity "onCreate":

facebookAccessToken = AccessToken.getCurrentAccessToken();

To check if the session is still active (I made it in the "onResume" method but do it where you need):

  if(facebookAccessToken != null){
        sessionExpired = facebookAccessToken.isExpired();
  }else{
        sessionExpired = true;
  }

More info in https://developers.facebook.com/docs/facebook-login/android

Answer 8

This seems to be working quite well with the new sdk.

private boolean isFacebookLoggedIn(){
    Session session = Session.getActiveSession();

    if (session != null) {
        //Session can be open, check for valid token
        if (!session.isClosed()) {
            if(!session.getAccessToken().equalsIgnoreCase("")){
                return true;
            }
        }
    }
    return false;
}

Answer 9

I had the same issue. Here is my solution using SDK 4.0:

First of all, in your activity dealing with login check, be sure to call this primary:

        FacebookSdk.sdkInitialize(this.getApplicationContext());

In your onCreate method put this :

updateWithToken(AccessToken.getCurrentAccessToken());

    new AccessTokenTracker() {
        @Override
        protected void onCurrentAccessTokenChanged(AccessToken oldAccessToken, AccessToken newAccessToken) {
            updateWithToken(newAccessToken, handler);
        }
    };

Then add the method called:

private void updateWithToken(AccessToken currentAccessToken) {
    if (currentAccessToken != null) {
        fillUIWithFacebookInfos(handler);
    } else {
        login();
    }
}

This way will handle the already logged in user and the newly logged in user.

Answer 10

I was using FB sdk for just for login.. Facebook developers reject my app, Because whenever user login, I send logout.. I dont matter user profile data... I just use FB for login.. FB tells if user login... dont send lgout...

I find Hacking way... Now my app doesnot send logout whenever user login.... Whatever user login with,Google,Facebook,or normal.. When they click logout... In this three condition I use LoginManager.getInstance().logOut();

No matter which platform they use... There is no crash :)