Share dialog Facebook on Android

Question

I follow this tutorial: https://developers.facebook.com/docs/android/share-dialog/

but I don't know where is the variable "callback" on this code:

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

uiHelper = new UiLifecycleHelper(this, callback);
uiHelper.onCreate(savedInstanceState);

I don't know what it is. It isn't declared anywhere in the tutorial.
I need help, please!

Answer 1

The second parameter to UiLifecycleHelper is of type Session.StatusCallback , which is defined in the first part of the tutorial . It's under Step 2: Set Up authentication change triggers I believe.