想要扩展到Android的.NET开发人员，您有什么提示和资源吗？

I am currently and for the past 3 years have been a .NET developer working on WPF and Siverlight and I want now to start learning how to be a developer for the Android OS. What should I start learning first, will my knowledge of .NET and C# help me or hurt me in this switch.I am currently and for the past 3 years have be