Sample of Google Plus Sign in and +1 in Xamarin.Android
Ensure that you setup and register your keystore for deployment! I have directions in the blog:
Settings up Google App & API: The next part is bit in depth as you will need to setup a google app and the API that the google play services will talk to. Google has a pretty great guide, but here are the pointers: *Note I am doing this on Mac OSX 10.9, on Windows the locations will differ.
1.) Create new app at Google App Console
2.) Go to Services and enable Google+ API
For this next part I switched back to the old console
3.) Get the SHA1 for your keystore (I am using debug to test, but you will want to use a final release keystore that you have to create before you ship).
4.) Find your debug.keystore in: /Users//.local/share/Xamarin/Mono for Android/debug.keystore
5.) Copy it into Java in /Library/Java/Home/bin
6.) Run this command in terminal after navigating to that directory:
keytool -exportcert -alias androiddebugkey -keystore -list -v
7.) This will output your SHA1 you will need:
8.) Use this to add oAuth to your app!