I can't get Xamarin to support an override of the WebViewClient class to support file upload. Here's the working Java http://pastebin.com/ZRbPvT6i , and here's the ported Xamarin code http://pastebin.com/zKCDFSKC
I want to see if I can check here if I have the write conversion syntax before I submit a bug.
Full java and Xamarin projects are here:
https://dl.dropboxusercontent.com/u/15227809/Examples/Java.WebViewTest2.zip
https://dl.dropboxusercontent.com/u/15227809/Examples/Xamarin.MyWb.zip