Skip to main content

How to handle response in OKHTTP in Kotlin Android

How to handle response in OKHTTP in Kotlin Android.

Here is a detailed step-by-step tutorial on how to handle responses in OKHTTP in Kotlin Android:

Step 1: Add the OKHTTP dependency to your project​

To use OKHTTP in your Android project, you need to add the dependency to your build.gradle file. Open your build.gradle (Module: app) file and add the following line to the dependencies block:

implementation 'com.squareup.okhttp3:okhttp:4.9.0'

Sync your project to download the dependency.

Step 2: Create an instance of the OkHttpClient​

To make HTTP requests using OKHTTP, you need to create an instance of the OkHttpClient class. Create a new instance of OkHttpClient in your Kotlin file:

val client = OkHttpClient()

Step 3: Create a Request object​

To send a request using OKHTTP, you need to create a Request object. The Request object represents the HTTP request you want to make. Create a new Request object with the desired URL:

val url = "https://api.example.com/data"
val request = Request.Builder()
    .url(url)
    .build()

Step 4: Send the request and handle the response​

To send the request and handle the response, you can use the client's newCall() method. This method takes the Request object as a parameter and returns a Call object. The Call object represents the HTTP call and allows you to execute the request and handle the response.

client.newCall(request).enqueue(object : Callback {
    override fun onFailure(call: Call, e: IOException) {
        // Handle the failure
    }

    override fun onResponse(call: Call, response: Response) {
        // Handle the response
    }
})

In the onFailure() method, you can handle any errors that occur during the request. For example, you can display an error message to the user.

In the onResponse() method, you can handle the response from the server. The response object contains information such as the response code, headers, and the response body.

Step 5: Extract data from the response body​

To extract data from the response body, you can use the response's body() method. This method returns a ResponseBody object, which you can use to access the response body as a string or as a byte array.

val responseBody = response.body?.string()

Step 6: Handle the response data​

Once you have the response body, you can handle the data as per your requirements. For example, you can parse the JSON response using a JSON parsing library like Gson or Moshi.

Here is an example of parsing a JSON response using Gson:

val gson = Gson()
val data = gson.fromJson(responseBody, Data::class.java)

In this example, the Data class is a Kotlin data class that represents the structure of the JSON response.

That's it! You have now learned how to handle responses in OKHTTP in Kotlin Android. You can use this knowledge to make HTTP requests and handle the responses in your Android app.