And some of us don't. It is presumed that you need a computer to run an IDE, but it is not presumed that you need a Mac. So saying that you need to have Mac to do something is quite an informative statement.

I own 5 personal computers, out of which 3 are desktops and 2 are laptops, with 2 of them running Windows, 2 Ubuntu and 1 of them Mac OS X.

Eclipse and Java work on all 5 computers. XCode works on only one. And because that OS X machine is a desktop, I barely ever use it, which is why I bought an Android instead of an iPhone.

How many of those machines will run visual studio?

None for me, because I have no interest in Visual Studio, or any Windows-related development in general.

However, at least I could make it run on all 5, by means of VMWare. That's not an option I have with XCode.

Do note they are working on IDE's for Android itself that would let you make apps on the device without the need for a secondary system.

I'm not sure who you are referring to when you say "they", but there is an Android IDE for building android apps already on the Play store:

https://play.google.com/store/apps/details?id=com.aide.ui...

I've only done some simple hello world type programs, but I was impressed.

Could you elaborate a better first step?