Xamarin's Visual Studio plug-in lets you build for iOS and Android on Windows.
Yes, it seems impossible but you can build iOS and Android apps alongside Windows apps in Visual Studio. The Xamarin plug-in for Visual Studio provides project types, UI Designers, and build options for both Android and iOS.
First you need to install Xamarin for Windows (Link : https://developer.xamarin.com/guides/android/getting_started/installation/windows/)
it will help you to create, build, test, and debug Android apps from within Visual Studio
Xamarin's Android UI Designer works in Visual Studio, letting you create your user interface by dragging and dropping controls onto each screen.
The Xamarin Android Player also runs on Windows, and provides a great Android simulator experience for testing your Android apps
for more detail see below link
Editor, DotNetSpider MVM
Microsoft MVP 2014 [ASP.NET/IIS]