Hipmunk's iOS app is awesome. I'm scratching my head as to how you would build their custom UI in Android with custom views and gestures. A Hipmunk widget to monitor a chosen 'I-want-to-go-to-X' flight would be of value. I am confident that they will find the right person and look forward to using or beta testing it. Android developers are hot right now because most iOS developers are scared of the Droid/Java/XML (no IB)
In Android, there is no IB. Closest equivalent is someone's project called http://DroidDraw.org. Since there is no IB, it is all code. XML is more code than meta-data when it comes to defining views. To make an equivalent UI in Android that is pretty as the iOS one requires a lot more unit effort than in iOS (and a lot more of that coming from the developer).
Droid Draw has been abandoned for years. The visual UI tools in the latest releases of the ADT is actually pretty decent. Probably not as good as what I've heard about IB, but not bad. Certainly better than Droid Draw ever was.