Android Tutorial #6: Retrofit + Kotlin Serialization — Modern API Calls
In the Compose series, you learned basic Retrofit: define an interface, call an endpoint, show the result. That works for tutorials. In production, you need more. Authentication tokens that refresh automatically. Logging for debugging. Retry logic for flaky networks. Proper error handling that shows meaningful messages. This tutorial builds a production-ready API layer with Retrofit 3, Kotlin Serialization, and OkHttp interceptors. Prerequisites: Compose Tutorial #12: Retrofit basics and Kotlin Tutorial: Serialization. Why Kotlin Serialization Over Gson? Retrofit traditionally used Gson for JSON parsing. Kotlin Serialization is better for modern Android: ...