In the last few weeks we've updated our 25+ Glide tutorials to Glide 4.x. All tutorials are now suitable to teach you the features for Glide 3.x and Glide 4.x. But what if you want to upgrade from 3.x to 4.x? In our opinion, the …

When working with Picasso, at some point you'll run into the following scenario: Picasso shows the error placeholder and you can't figure out why. Even when you activate logging you'll only see that loading an image failed, but not the reason for the failure. In this tutorial, you'll learn how …

In a previous tutorial, we've explored unwrapping response envelopes. Of course, there also are APIs where you wrap the requests into envelopes. If every request is wrapped in an envelope, this will make your app's code unnecessary complex, because you've to create the envelope for every request manually. In this …

In the Retrofit getting started tutorial you've learned how to create an Android app that connects to the public GitHub API and accesses objects on the server. In following tutorials you've learned how to create new objects and update existing ones. In this tutorial you'll learn how delete objects on …

We recently worked on a project where the API wrapped all responses into an envelope. For example, when the app requested the user info, it always got a wrapped response: { "serverInfo": { "apiVersion": "0.0.1a" }, "statusCode": 200, "payload": { "username": "Norman", "id": 42 } } The payload was the actual interesting information. Previously, …

In the Retrofit getting started tutorial you've learned how to create an Android app that connects to the public GitHub API. In following tutorials you've learned how to use OAuth to make requests as an authorized GitHub user. Finally, you've learned how to create new objects. In this tutorial you'll …

Welcome to this tutorial with a very abstract title! OkHttp interceptors are quite great in making Retrofit even better by customizing requests (or responses) in a central place. We've used OkHttp interceptors a lot in previous tutorials (Manage Request Headers, OAuth, and many more). A downside of the interceptors is …

When implementing network requests on mobile devices a lot of things can go wrong: no network connection or the server responds with an error. In either case you need to make sure you deal with the error and, if necessary, inform the user about the issue. In the tutorial on …