You have slightly less than 23 hours to download a copy of
Android Studio Essentials for
free from Packt Publishing.
The
free download is a part of their "Android Week 2016" promotion, in which they offer a different free ebook related to the Android OS.
Packt says:
Get to know your way around the Android Studio IDE. We think it will simplify your life and take some of the stress out of developing your next Android app - which means you can focus on more important problems. Pick it up for free today.
Navigate to
this webpage to claim your free ebook.