If you're using the code obfuscator ProGuard before releasing apps, this will be a valuable tutorial for you. We'll go through a standard ProGuard configuration, which should prevent unexpected runtime exceptions in your apps when you're using ProGuard and Gson. If you're not using ProGuard, you can check our other …

When you’re developing an app professionally, you’re probably dealing with multiple server environments. Your API developers are constantly changing and improving the endpoints the apps consume. If you’ve an excellent backend developer, he’ll provide multiple environments: develop: latest snapshot of the API code staging: next API …

Retrofit is an excellent library to load data from an API or website. In a previous tutorial, you've learned how to load data from Wikipedia with jspoon. However, we didn't cover displaying that data. In this tutorial, you'll use a RecyclerView to display the section titles of a parsed Wikipedia …

Returning the result of a long-running function at a later time is an important aspect of programming. A lot of high-level programming languages have the asynchronousity build in (e.g. C# with delegates) or it’s part of the language nature that it even leads to a callback hell (Node. …

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 …

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 …