an specific issue has occured in my project. I've found only one library for C# supporting Android (in Xamarin): Sharp.XMPP, NuGet, but I have troubles with it. When I write some sample code in separated portable class library, I get these errors:
Error 1: '.ctor' is not supported by the language
by the line
using (XmppClient client = new XmppClient(hostname, username, password))
{
...
}
Next:
Error 2: Metadata file '...\Project.Jabber.dll' could not be found
Warnings 2-6: Reference to type 'System.Net.Security.RemoteCertificateValidationCallback' claims it is defined in 'c:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETPortable\v4.5\Profile\Profile78\System.dll', but it could not be found c:\Users\Kliford\Downloads\S22.Xmpp\S22.Xmpp.dll
I am clueless. Thank you in advance.
Sharp.Xmpp is not compatible with PCL since it uses the XmlElement class, which is not currently available in PCL.
Rewriting this part is doable, but requires a significant effort.
The workaround that I use, is to develop .Net 4.5 Class libraries, which reference Sharp.XMPP. Portability among Windows and .Net is achieved through Xamarin.
Hope this helps