如何在线添加自定义字体到应用程序中的TextView，但使用XML？

I want to add a custom Samsung font called SamsungOne to an Android app, I know you can link a font from online to put on a website, but how do you do this for an app, but using XML? Java is fine, but XML would be better. Can anyone help?I want to add a custom Samsung font called Sams