How to get raw json response of Retrofit in Kotlin?

Question

I am new to Kotlin and Retrofit. I want to call a base URL through Retrofit and print the raw JSON response. What would be the simplest minimal configuration?

Let's say,

base url = "https://devapis.gov/services/argonaut/v0/" 
method = "GET"
resource = "Patient"
param = "id"

I tried,

val patientInfoUrl = "https://devapis.gov/services/argonaut/v0/"

        val infoInterceptor = Interceptor { chain ->
            val newUrl = chain.request().url()
                    .newBuilder()
                    .query(accountId)
                    .build()

            val newRequest = chain.request()
                    .newBuilder()
                    .url(newUrl)
                    .header("Authorization",accountInfo.tokenType + " " + accountInfo.accessToken)
                    .header("Accept", "application/json")
                    .build()

            chain.proceed(newRequest)
        }

        val infoClient = OkHttpClient().newBuilder()
                .addInterceptor(infoInterceptor)
                .build()

        val retrofit = Retrofit.Builder()
                .baseUrl(patientInfoUrl)
                .client(infoClient)
                .addConverterFactory(GsonConverterFactory.create())
                .build()

        Logger.i(TAG, "Calling retrofit.create")
        try {
            // How to get json data here
        }catch (e: Exception){
            Logger.e(TAG, "Error", e);
        }
        Logger.i(TAG, "Finished retrofit.create")

    }

How can i get the raw json output. I don't want to implement user data class and parsing stuffs if possible. Is there any way?

Update 1

Marked duplicated post (Get raw HTTP response with Retrofit) is not for Kotlin and I need Kotlin version.

If you only want to print the response then why not use `HttpLogIntercepter`? To Get raw response [Follow this](https://stackoverflow.com/questions/33282889/get-raw-http-response-with-retrofit) .. — ADM, Jun 12 '19 at 07:27
Have look [this](https://stackoverflow.com/a/33256827/5110595) — Hemant Parmar, Jun 12 '19 at 07:30
@SazzadHissainKhan Here is a Doc illustrating about logging with a one liner code .. https://futurestud.io/tutorials/retrofit-2-log-requests-and-responses.. If you are having problem with Kotlin Syntax then you can write it in java and later covert it in Kotlin then Understand the syntax .. — ADM, Jun 12 '19 at 07:51
`Marked duplicated post (Get raw HTTP response with Retrofit) is not for Kotlin and I need Kotlin version.` then convert it. I like how your bio says "problem solver" yet you rely on others to convert Java code to Kotlin **for you** — Zun, Jun 12 '19 at 08:13
Possible duplicate of [Get raw HTTP response with Retrofit](https://stackoverflow.com/questions/33282889/get-raw-http-response-with-retrofit) — denvercoder9, Jun 18 '19 at 06:34

score 21 · Accepted Answer · answered Jun 12 '19 at 08:10

It is pretty easy you just need to make your network calls function like this.

@FormUrlEncoded
@POST("Your URL")
fun myNetworkCall() : Call<ResponseBody>

The point here is your network call should return a Call of type ResponseBody. And from ResponseBody you can get the response in String format.

Now when you will call this function to perform the network call you will get the raw string response.

    MyApi().myNetworkCall().enqueue(object: Callback<ResponseBody>{
        override fun onFailure(call: Call<ResponseBody>, t: Throwable) {
            //handle error here
        }

        override fun onResponse(call: Call<ResponseBody>, response: Response<ResponseBody>) {
            //your raw string response
            val stringResponse = response.body()?.string()
        }

    })

Its pretty simple. Let me know if you want any other details. Hope this helps. Thank You

score 2 · Answer 2 · answered Jun 12 '19 at 07:30

2

You can simply use the response body of okhttp as retrofit is based on okhttp.

Here is an example which you can convert to your use case:

@GET("users/{user}/repos")
  Call<ResponseBody> getUser(@Path("user") String user);

Then you can call it like this:

Call<ResponseBody> myCall = getUser(...)
myCall.enqueue(new Callback<ResponseBody>() {
    @Override
    public void onResponse(Response<ResponseBody> response, Retrofit retrofit) {
        // access response code with response.code()
        // access string of the response with response.body().string()
    }

    @Override
    public void onFailure(Throwable t) {
        t.printStackTrace();
    }
});

For more information see: https://stackoverflow.com/a/33286112/4428159

answered Jun 12 '19 at 07:30

Umar Hussain

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3

My question was for Kotlin – Sazzad Hissain Khan Jun 12 '19 at 07:32
1

What do you mean by `getUser(...)` – Sazzad Hissain Khan Jun 12 '19 at 07:36
You can easily convert Java code to kotlin or you can directly use java code in kotlin as well. – Umar Hussain Jun 12 '19 at 07:37
getUser(...) is the implementation of the interface which I defined in first step. – Umar Hussain Jun 12 '19 at 07:38
1

Could you please update your answer for Kotlin. I am not getting your getUser. Could you please post the implementation also. Thanks. – Sazzad Hissain Khan Jun 12 '19 at 07:39
I haven't worked with kotlin. See if this helps you https://medium.com/@elye.project/kotlin-and-retrofit-2-tutorial-with-working-codes-333a4422a890 – Umar Hussain Jun 12 '19 at 07:41
Your link asking to switch me for premium medium account :(. – Sazzad Hissain Khan Jun 12 '19 at 07:44
try in private browser window. – Umar Hussain Jun 12 '19 at 07:49
`response.body().string()` does not print the json rathe printing class id, `okhttp3.ResponseBody$1@88eab56` – Sazzad Hissain Khan Jun 13 '19 at 06:42
In my case for printing the json string and only that, I have to use JsonObject instead of ResponseBody everywhere, and use response.body().toString() – android_dev71 Aug 17 '22 at 15:16

How to get raw json response of Retrofit in Kotlin?

Update 1

2 Answers2

Linked