One of the most commonly asked questions in our email inboxes and comment sections is about API requests not working. The request works on another client (iOS app, Postman tool, …), but not with Retrofit on Android. Our usual suggestion is to add logging via OkHttp interceptor or via Stetho and …

Every good software product follows some architecture and implementation patterns. In the past few decades, a lot of different ideas emerged. New and even experienced developers can still be overwhelmed by the amount of different patterns and when they should be applied. In this tutorial we’ll introduce you to …

In the past tutorials, you've learned the basics of Retrofit call adapters, how to integrate RxJava 1.x interfaces and RxJava 2.x interfaces to your Retrofit callbacks. In this tutorial, you'll learn how to integrate Retrofit's request callbacks into your Guava flow. {{outline}} Integration of Retrofit Callbacks into Your …

Using Retrofit for your Android app's networking can make your life so much easier. However, Retrofit's design requires a single Retrofit instance for each API with a different base URL. Consequently, if your app is talking to two or more APIs (under different URLs), you'll need to deal with at …

Array.map() is a synchronous operation and runs a function on each element in the array resulting in a new array with the updated items. There are situations where you want to run asynchronous functions within map, e.g. updating a list of models and push the changed information back …

One frustrating element of our work life as Android developers is that we're often dependent of APIs. APIs can be unfinished, broken, or just slow, which all stall app development. It can be frustrating if we're trying to polish some UI elements, but cannot finish the work because of an …

We've tailored our 80+ tutorials on Retrofit to the Android platform. The snippets and examples are usually specifically written for Android apps. But that doesn't do Retrofit justice. Retrofit supports any regular Java project, not just on the Android platform. Even though you can implement the vast majority of our …

In the past weeks, you read an introduction to Retrofit call adapters and how to integrate various first-party call adapters (RxJava 1.x, RxJava 2.x, Guava). In another tutorial, you've learned how to implement a custom call adapter. In that tutorial, you implemented a custom call adapter, which separates …