Hi.
I write here my experience with adaptation of Periklis code, sample2, and his library. I have read of many problems concerning signatures etc. BUT, with my "surprise", actually I had no problem and now I wonder myself where and when these problems will arise. As a matter of fact, first, in Facebook I have done the setup of my Android App, and generated App Id and secret code. Then I put these data inside the adpated code, following the Step by Step procedure. Then I tested with Android Simulator, and, as expected no problems. Then I uploaded by cable a signed Apk to my phone, installed it .. and works perfectly. That's all. I didn't use the code emitted by the Log, as the author of the library says. Perhaps my situation is different from that of other users that wrote comments here? The only thing that happens is that Facebook asks me for confirming the Access and, after first time, despite asking again a confirm, it says that I have already authorized this App..
Very useful lib, thanks to Periklis. Great job.