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Well let me put it in this way....
Google's Android is a platform which support Java and recenly They released a C++SDK
But most of the apps you find are java apps.
C# is microsoft's proprietary Language. Of course Microsoft allows redistributing some of the library free, but it is not free and some times not suitable for Opensource community.
Mono is a Drop-in Replacement for .Net platform, but it also requires several .DLL files from Microsoft.
mono is good and available as Opensource alternative for .Net platform.
see this page for more info Main Page - Mono