Мобильные приложения. Справочный материал

Google. Documentation for app developers

https://developer.android.com/guide/https://material.io/design/

Develop for Windows

https://developer.microsoft.com/en-us/windows

https://developer.microsoft.com/en-us/windows/apps/design

Human Interface Guidelines

https://developer.apple.com/design/human-interface-guidelines/

https://developer.apple.com/documentation/

Xamarin Flashlight

https://docs.microsoft.com/en-us/xamarin/essentials/flashlight?tabs=android

Xamarin Vibration

https://docs.microsoft.com/en-us/xamarin/essentials/vibrate?tabs=android