Docs [https://docs.microsoft.com/xamarin]
Github repos [https://github.com/xamarin]
Create custom view in Xamarin.Forms [https://docs.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/custom-renderer/view]
Create custom view in Xamarin.Android [https://medium.com/@mclint_/how-to-make-a-custom-view-in-xamarin-android-3d2dcb391936]
Xamarin.Android architecture [https://docs.microsoft.com/en-us/xamarin/android/internals/architecture]
Embed Flutter UI in existing Xamarin.iOS and Xamarin.Android apps [https://github.com/flutter/flutter/issues/15200]