Original is there: https://medium.com/exploring-android/android-networking-with-coroutines-and-retrofit-a2f20dd40a83 Translation is there: https://habr.com/post/428994/
The example has been made for 15 minutes for basic ideas illustration, so there are some code smells (like logic in Activity, string constants, ...) and very simple behaviour.
Also you need to get your API key from "https://tech.yandex.ru/rasp/raspapi/" and put it to local.properties (yandex_api_key=...)