Gson is awesome in making conversion from JSON to Java classes easy for us developers. With a few lines of code, you can pass JSON and get fully-mapped Java objects back. However, one pain point of using Gson is setting up appropriate Java POJO classes. Creating a POJO class based …

A lot of readers on our Retrofit series are just starting out with developing software or are new to Java/Android. We're really happy to welcome all new developers! We've received many questions, which were caused by implementing apps with Retrofit, but not actually specific to Retrofit. Consequently, we decided …

Axios is a promise-based HTTP client for the browser and Node.js. It has a convenient and modern API simplifying asynchronous HTTP request and response handling. Let’s explore how to download files with Axios in Node.js. {{outline}} {{video}} Axios File Download in Node.js This tutorial is specifically …

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 …