Yeah,Sorry. When Ive been saying android Studio, Ive meant to say Xamarin Studio.
Android Studio is the free IDE that comes with the standard android SDK.
It is for java/native development on Android. It doesnt support C#.
Xamarin Studio is the free IDE that comes with Xamarin (including the free starter edition)
It supports C#.Net development on Android using Xamarin. This is the free route, but you do not get Xamarin.Forms or VS integration.
If you get A Xamarin “Indie” license, you get Xamarin.Forms as well (but still no VS integration)
If you get a “Business” License, you also get the ability to use Xamarin from within the Visual Studio IDE, which is the best of all worlds, IMHO, but is a little pricey
Remember, Microsoft Bizspark is free though, if you apply and answer a few questions and convince MS that you are a tiny poor startup of less than 5 people (you basically explain your plan to develop apps and why you want to use microsoft products)
And then you get an MSDN subscription, VS ultimate for free, big discounts on the xamarin licenses, and all the MSDN downloads (every operating system, with keys, back to windows 3.1… I’ve been having fun with Windows 10 and VS 2015 from the msdn downloads)
Then, if you use the free Wave Engine, you get a game engine library with nice cross-platform integration (windows, windows phone, android, linux, ios), physics engine, etc: