your response is not really helpful

@Loulou
You're talking nonsense, for iPhones (ipa) it's Objective-C and for Android (apk) it's in Java.

And "requesting validation for apk" means nothing, so anyway if you don't know, don't say anything.

So conversion is not possible, but on the other hand, if you have an iPhone (iPod or iPad), a computer, patience, a brain, and fingers, you can manage to create apk applications.

Good luck ;) !

@cascroute13, and converting an iPhone application (html5) and yes, not all of them are in objective-c, into an Android, Bada, Blackberry application (html5) isn’t possible??
To access the sources of the ipa, you just need to open the ipa with winrar and I think we can access it.
Then converting an objective-c application into an apk, yes you have to do it yourself and know objective-c, C++, Java, etc. and choose the best way to reproduce it.

I believe that we can convert .ipa to .jar
.jar to .apk

@cascroute13: we can convert applications that are based on HTML5, and like you said: if you don't know, don't say anything.

If someone had an answer to this very interesting question, it would really clarify things.
When we look at the initial question and what the geeks get into in their explanations, which are more than incomprehensible for us simple folks.

completely agree, trolls and geek arguments are irrelevant. Another concrete question that relates to this: I found an app that I'm very interested in: "waterlogue," which is only available on i-devices, and not even on Mac, although their site states that a Mac version is planned. The issue isn't paying the 3 euros to the developers of this app; they’re doing their job well and deserve compensation, that's normal. The problem is that they haven't planned to adapt it for Android, PC, or as a Photoshop plugin (it's a graphic application and I'm a graphic designer), and that frustrates me! It's also a matter of work comfort; I want to use it in my creations, and I work on Windows.
So my question is, is there an emulator in the underground of the net that allows this kind of thing (I've heard about the Iemu project and the Virtual software, cross-platform software that supposedly allows real emulation of the IOS system on Windows, but I can't find them...) or do we need to code our own app to adapt it? Or is there some site with "unofficial" software and apps where someone might have already done the job?
Thank you for your help.

I know that the last response was a year ago, but since I was asking myself the same question today, it might interest someone:
https://appsgeyser.io/535702/Ipa%20To%20Apk%20Converter

What is it if it's not Java?

I am an Android developer so I know, and just when you enter Eclipse, the window title is: "Java - (your project name)"

So I'm laughing so hard that I'm posting a comment!!!
Android is not Java!?
So explain to me what I'm coding, please, and also what is the point of downloading the JDK for Eclipse when you're coding for the Android platform!!!
Seriously, making such bold statements on a subject you don't master is really pointless!!!

Anyway, ++

Now we can only code in C/C++, but that's from Jelly Bean, so it's quite recent.

Android is PHP, I think.