Most apps talk to a server: to load a feed, sign a user in, or send data back. This module shows how an Android app calls a web API and puts the result on screen.
Begin with how HTTP and REST work, then use Retrofit to describe an API as a Kotlin interface. Combine it with coroutines so requests run off the main thread, parse the JSON response into data classes, and expose the result from a ViewModel as loading, success, and error states for your Compose UI.
The lessons below are video tutorials. Start with the first Retrofit video, then follow the Compose and MVVM one, and finish with coroutines. Once you can fetch and show remote data, continue on to Testing & Debugging.
Learn Retrofit with Jetpack Compose in Android Studio, with projects and real-world examples. A good first stop.
A beginner-friendly Retrofit tutorial that builds REST API calls in an Android app from scratch.
Call an API that lists characters and show the results in Jetpack Compose using MVVM, with image loading via Coil.
Integrate Kotlin coroutines with Retrofit to build a robust and efficient networking layer.