Xamarin，Android：这个“ListView适配器”如何工作？

So, I'm working on this app with a chat included. I downloaded a sample and I am trying to change the layout. But this somehow doesnt work. There is another layout that is called listview adapter and I dont know what it does but I think it it somehow connected with the problem. THis is the original LayOut (only a list and a button and a edittext:So, I'm working on this app with a chat include