![]() ![]() The most important method here is execute, which is used to execute a call synchronously and will block the current thread while transferring the data. Retrofit uses two different callback methods for the two possible outcomes of a network requests: either a failure or a successful request. Here, we can see how Retrofit takes care of the construction of our service interface by injecting the code necessary to make the request, based on our previous annotations.Īfter that, we get a Call object which is the one used for executing the request to the GitHub API. Now that we have our Retrofit object, we can construct our service call, let's take a look at how to do this the synchronous way: UserService service = retrofit.create(UserService.class) Ĭall callSync = service.getUser("eugenp") We could also add headers and interceptors for every call, which we're going to see in our authentication section. This is going to take care of connecting to the server and the sending and retrieval of information. The last dependency is OKHttpClient â which is an HTTP & HTTP/2 client for Android and Java applications. Retrofit is a type-safe REST client for Android, Java and Kotlin developed by Square. For a list of already implemented factories, we can have a look here. It's important to note that different factories serve different purposes, so keep in mind that we can also use factories for XML, proto-buffers or even create one for a custom protocol. In all fairness, RxJava and Retrofit have some difficulty in learning and using them compared to previous frameworks (such as AsyncHttpClient, Volley, etc.) RxJava's powerful and large operators, Retrofit uses an annotation style definition interface, which will cost beginners A lot of effort, around a lot of circles, stepping on a lot of pits. In this example, we're going to use the GsonConverterFactory, which is going to map our JSON data to the User class we defined earlier. It needs the base URL which is going to be used for every service call and a converter factory â which takes care of the parsing of data we're sending and also the responses we get. Retrofit provides a convenient builder for constructing our required object. addConverterFactory(GsonConverterFactory.create()) Retrofit retrofit = new Retrofit.Builder() while RxJava & RxAndroid can do the similar for you (i.e doing some tasks in sync or async), it is not limited to API call only. Service.getUser().To construct an HTTP request call, we need to build our Retrofit object first: OkHttpClient.Builder httpClient = new OkHttpClient.Builder() Retrofit is specifically designed for API calls which Synchronously or Asynchronously calls an API for you (you can specify that). I think most importanly, avoid nested callbacks( callback hell).Ä®.g) Callback hell (Retrofit) public interface Integer id) So I am not able to wait and consume the response in the Activity.java method (so that I can handle what happens next). ![]() In Android, we can use RxAndroid in addition to RxKotlin for added Android flavors and. It included the combination of Retrofit requests, using RxJava to chain the operations along, saving the data to RealmDB and cleaning things up with Kotlin extension functions. You can even do many cool things in addition to retrying (like e.g. My problem is that when I call login from Activity.java, the Service.java method uses call.enqueue from Retrofit and it is async. We have to enqueue it with a Callback instance. RxJava is a really nice library to use in combination with Retrofit.Then why need another background task RxJava? I am attempting to do a login for an android app. Retrofit Already in run on background thread. ![]()
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