Mono-For-Android-compatible version of Web Api client
The current Web Api Client is not compatible with Mono For Android, and trying to use HttpWebRequest and OData from Android mobile app. is a pain. Not sure about the amount of effort involved, but the author of Json.Net recently provided an mfa-compatible version, packaged as a Portable Class Library.
Jason Steele commented
HttpClient is now a PCL - does this help?