Creating an Android app

If you’re interested in using Xamarin.Forms to target Android devices, first become familiar with the Getting Started documents on the Xamarin website:

https://developer.xamarin.com/guides/android/getting_started/

If you’re using Visual Studio, and if everything is installed correctly, you should be able to select File > New > Project from the menu, and in the New Project dialog, from the left, select Visual C# and then Android, and from the template list in the center, select Blank App (Android).

If you’re using Xamarin Studio, you should be able to select File > New > Solution from the menu, and in the New Project dialog, from the left, select Android and App, and in the template list in the center, select Android App.

Give it a location and a name; build and deploy. If you can’t get this process to work, it’s not a Xamarin.Forms issue, and you might want to check the Xamarin.Android forums for a similar problem:

http://forums.xamarin.com/categories/android/

Source of Information : Creating Mobile Apps with Xamarin.Forms