Question

I am developing an Android App that integrates with Facebook. I would like to:

1. Let the user login with Facebook
2. Get the user’s email address on Facebook (could be a proxied email address, which is fine)
3. Post to the user’s wall/timeline on his/her behalf

Technically, that would be to:

1. Authenticate the user
2. Request the email permission
3. Request the publish_stream permission

1. Authenticate the user

I called Session.openActiveSession() with a Session.StatusCallback (I already checked that there is no active opened session beforehand):

final Session.StatusCallback sessionStatusCallback = new Session.StatusCallback() {
    public void call(final Session session, SessionState state, Exception exception) {
        // If there is an exception...
        if(exception != null)
        {
            // Handle fail case here.
            return;
        }

        // If session is just opened...
        if(state == SessionState.OPENED)
        {
            // Handle success case here.
            return;
        }
    };
};

// Start Facebook Login.
Session.openActiveSession(activity, true, sessionStatusCallback);

My callback is called after successful login. So far so good.

2. Request the email permission

This is my status callback:

new Session.StatusCallback() {
    public void call(final Session session, SessionState state, Exception exception) {
        // If there is an exception...
        if(exception != null)
        {
            // Handle fail case here.
            return;
        }
        
        // If token is just updated...
        if(state == SessionState.OPENED_TOKEN_UPDATED)
        {
            // Handle success case here.
            return;
        }
    };
};

I request the permission with Session.requestNewReadPermissions():

final Session session = Session.getActiveSession();
final static String[] PERMISSION_ARRAY_READ = {"email"};
final List<String> permissionList = Arrays.asList(PERMISSION_ARRAY_READ);

// If all required permissions are available...
if(session.getPermissions().containsAll(permissionList))
{
    // Handle success case here.
    return;
}

// Request permissions.
session.requestNewReadPermissions(new Session.NewPermissionsRequest(activity, permissionList));

My callback is called after permission is granted. So far so good.

3. Request the publish_stream permission

This is my status callback:

new Session.StatusCallback() {
    public void call(final Session session, SessionState state, Exception exception) {
        // If there is an exception...
        if(exception != null)
        {
            // Handle fail case here.
            return;
        }
        
        // If token is just updated...
        if(state == SessionState.OPENED_TOKEN_UPDATED)
        {
            // Handle success case here.
            return;
        }
    };
};

I request the permission with Session.requestNewPublishPermissions():

final Session session = Session.getActiveSession();
final static String[] PERMISSION_ARRAY_PUBLISH = {"publish_stream"};
final List<String> permissionList = Arrays.asList(PERMISSION_ARRAY_PUBLISH);

// If all required permissions are available...
if(session.getPermissions().containsAll(permissionList))
{
    // Handle success case here.
    return;
}

// Request permissions.
session.requestNewPublishPermissions(new Session.NewPermissionsRequest(activity, permissionList));

This time, my callback is not called after permission is granted.

Investigation

Upon further investigation, I found that my callback is triggered by com.facebook.Session#postStateChange(SessionState, SessionState, Exception):

void postStateChange(final SessionState oldState, final SessionState newState, final Exception exception) {
    if (oldState == newState && exception == null) {
        return;
    }

    /* ... */
}

Since oldState and newState are equal (both being SessionState.OPENED_TOKEN_UPDATED, my callback is not called.

Question

How can I receive any notification after permission is granted for the 2nd time? Am I supposed to close() the session and re-open it from cache?

Additional info

My Facebook Android SDK 3.0 is download from here, which is stated in Facebook’s Getting Started with the Facebook SDK for Android.

Answer 1

This is a bug.

[edit: As Guy points out in comments, this was fixed in 3.0.1, so this workaround is no longer necessary]

The workaround you mention is basically correct, though you do not need to call close. If you are using the single active session, before calling requestNewPublishPermissions() just call:

Session.openActiveSessionFromCache(myContext);

If you are using multiple sessions, you need to initialize a new Session with the TokenCachingStrategy, verify it is in the CREATED_TOKEN_LOADED state, and call openForRead(null);

After doing one of these, requestNewPublishPermissions() should call your notification once it completes.