I am also looking out for great native looking mobile UI myself and stay inside of haxe.
I have found HaxeUI which I think builds on stop off openfl, you might have already seen that though.
It seems like you can use hxwidgets, to get native components. You can see at 6:50 in the this video: Little bit of rambling about #HaxeUI for desktop, web and mobile - YouTube
You will see the android button look android like