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I am using Facebook SDK 3.0 for authentication. It works fine when facebook app is not installed on the device. If the facebook app is already installed on the device, I am unable to fetch the Access token value.
I am using the same code given in helloFacebookSampleActivity.java in the tutorial.
This is due to the Single Sign-On feature provided by facebook. It allows user to sign in to your app if he/she is already logged-in, in the native facebook app, without having to re-enter the username and password.
To get this working you have to submit your Android key hash to your facebook profile. For more information on this please read the
Step 4given here.