However, since you are generating a MutableLiveData, you should be able to observe, which will give you an update when your asynchronous call sets the value. This example will demonstrate the working of MVVM using Live data. How would you write the same feature with different ideas applied. 4 Answers Sorted by: 6 You're making an asynchronous call, so data.value will not be set until that asynchronous call resolves. This is an example to demonstrate MVVM Architecture in Kotlin with Retrofit in Android. All you need to do is call 1 api and display the data. Use your repository to enqueue a call and update your LiveData in its callbacks. Suppose you are writing a post detail screen in a blog app. Method 1: Using Standard Calls We’ll start off, firstly with the normal way to do it. I'm gonna convince you Retrofit is better than OkHttp when you follow MVVM. Most of the answers would be a feature comparison, pros and cons, then they'll tell you Retrofit saves you so much time. Make the POST request: val call = apiService.People have been asking the question "Retrofit vs OkHttp" for years. Here's an example of how to implement a form URL-encoded POST request using Retrofit:ĭefine the API service interface: interface "endpoint") fun sendData "param1") param1: "param2") param2: String Using retrofit enqueue request in viewModel 24. Form URL-encoded POST request: Form URL-encoded requests are commonly used when sending data as key-value pairs, similar to how HTML forms are submitted. Is CriminalIntent Follow MVVM Architecture Android Programming (4th Edition).Let's explore different types of POST methods and how to implement them using Kotlin with Retrofit. Retrofit supports various types of POST methods to send data to a server. In the Java directory, right-click and select new- java class- app/src/main/java> class. For our instance, we only want to get the names of the fictional characters. Making the DELETE request val response = leteUser( 999)ĭifferent Kinds of POST Method w/ Retrofit Next, we will create a model class that will contain the objects from the JSON. Interface "users/") suspend fun deleteUser ( "id") userId: String): Response To consume a REST API using Retrofit2 using the MVVM pattern in Android the you will need to complete the following steps. Example of how to perform a GET request using Retrofit: Use case layer will connect with Data Layer. View model will connect with Use Case layer. Only View Model will have access to UI layer. You can follow the following pattern for the same. GET Request: A GET request s used to retrieve data from a server. First of all application architecture needs to be restructured so that each layer has designated role in MVVM.To enable support for Gson serialization/deserialization also includes the Gson converter dependency: implementation '2:converter-gson:2.9.0' Various HTTP methods supported by Retrofit To get started with Retrofit, add the following dependency to your project's adle file: implementation '2:retrofit:2.9.0' Additionally, we'll discover the concept of mock responses and learn how to use them with Retrofit. The Model, View, ViewModel (MVVM pattern) is one of the architectural patterns defined to write clean code in which there is a proper separation between Application logic and presentation layer. In this blog post, we will dive deep into Retrofit and explore how to use it for different HTTP methods, including GET, POST, PUT, PATCH, and DELETE. Its simplicity, flexibility, and powerful features make it an ideal choice for interacting with web services. In the realm of Android development, Retrofit has emerged as a go-to library for handling API communication. If get to know something new by reading my articles, don't forget to endorse me on LinkedIn
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