The prerequisite for taking part in the contest were to contribute to Android forum, which I did. I’m guessing they did not use a completely randomized system since I got selected after writing (only) 3 or 4 posts, but rather awarded by merit. I did put some effort in writing replies that are not only useful to the original poster but to a wider community
I believe it’s always a good thing to do contribute. Sometimes it pays off by winning something tangible like this book. In the rest of cases you win something even more valuable - enthusiasm. That’s my case at least. :-)
Anyway, I’m eager to get my hands on this book. I will post my book review and general impressions here.