Endless RecyclerView in Android using Android Studio - Kotlin

Hi,
progress bar shows error. How can I write correctly?

how is it done with data from Api using retrofit?

please make this video android java

Please do RecyclerView with Sticky Headers tutorial like in iOS please very important for me sir!!!!!!!!!

You're an excellent teacher. Every time I watch your videos I am ecstatic because I learn so much. And thank you for placing the subtitles for some of us who don't understand English very well and we need to read it to understand.

In addition I have a question: are you going to do a Flutter course in the near future? I ask you because in your emulator I saw an application. It would be great if you did a Flutter course, I would be one of the first to see the videos.