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I am using Facebook SDK in hackbook and tried to login and do all the operations in the hackbook. It works fine. And after installing the Facebook application for Android, when I click on login it does not return data in onActivityResult. It returns null in intent data.
The Facebook application is already logged in with my ID and when I try Facebook login with some other application, it is working fine. Do I have to give any extra permissions?
It is probably an invalid hash key error (the hash key you generated and inserted on the Facebook application page)…
See my answer to a similar Stack Overflow question, isSessionValid() returns NO when Facebook native application is installed.
I hope this helps.