9/12/2023 0 Comments Use rxjava with retrofit enqueue![]() ![]() Override fun enqueue( callback : Callback>) Ĭallback.onResponse( Response. All subclasses of a sealed class are known at compile-time, which allows you to use them exhaustively in the when expression.Īs you’ve seen in the figure above, there are typically three scenarios where you’d want to construct a sealed class: ![]() Sealed classes represent quite more restricted class hierarchies than normal classes in Kotlin. Modeling Retrofit Responses With Sealed Classes/Interfaces Let’s see how to construct the wrapper class with a sealed class. For example, configuring UI elements and displaying a different placeholder/toast depending on error types. So how do you solve this problem? It’s simple: Wrap every possible scenario of an API response with a sealed class as in the figure below:īy passing a wrapper class to the call site, the presentation layer can handle results depending on the response type. rge(createdReportsObs.toCompleteable(), editedReportsObs.toCompleteable()). This is assuming you don't need to know any of the server results, just need to wait for them to complete. This means you should write lots of try-catch boilerplate code for each API request. Are you using RxJava 2 If so you can use the new completable api. You also need to handle exceptions somewhere in this multi-layer architecture, because API calls may throw an exception and it can be propagated to the call site. So if you return an empty list or null when the network request fails, other layers have no idea how to figure out whether the request was successful or not. The fetchPoster function may return an empty list if the body of the API response is empty. In this architecture, you will face the following problem: results are ambiguous on call sites. But suppose you need to handle the response and exceptions in a multi-layer architecture as in the API data flow below: Retrofit is a type-safe REST client for Android, Java and Kotlin developed by Square. We’ve added new code examples for Retrofit 2 besides. You’ll get to know Retrofit’s range of functions and extensibility. The series dives through all aspects of Retrofit and prepares you for many potential use cases. This is the first tutorial in an extensive series on Retrofit. We'll build an example application interacting with the GitHub API using the standard Retrofit approach, and then we'll enhance it using RxJava to leverage the advantages of Reactive Programming. Retrofit Getting Started and Creating an Android Client. Call interface provides two methods for making the HTTP requests: execute () Synchronously send the request and return its response. Each call yields its own HTTP request and response pair. ![]() This snippet is a basic example of calling the Retrofit API and handling the response. Overview This article focuses on how to implement a simple RxJava-ready REST Client using Retrofit. Call.execute () and Call.enqueue () Methods In Retrofit 2, all requests are wrapped into a retrofit2.Call object. Observable createdReportsObs = om(createdReports) //. Specifically I have two ArrayList: ArrayList createdReports = myHelper.getOfflineCreatedReports() ĪrrayList editedReports = myHelper.getOfflineEditedReports() Įach report can use methods to get Observable instances from my ApiService (Retrofit implementation). 5 Photo by James McKinven on Unsplash The use of RxJava has really shielded us away from topics like this because RxJava is now a ubiquitous term with android development, so. I need to be notified when all of these requests have finished, to start another task. Calling enqueue tells Retrofit to make that call on a background thread and return the result to the callback that were creating here.I want to update some records via an API.I want to register new records via an API. ![]()
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