How to Parse Json in Kotlin Using Retrofit?-CodePudding

i am new to kotlin and i am in learning phase. I have followed many links but didn't able to understand completely. I want Json response to show in my textview.

Problem: 1 I have tried this code but was unable to get data, but i want to get the items inside data object. Quote and author are coming null.

{
"status": 200,
"message": "Success",
"data": {
    "Quote": "The pain you feel today will be the strength you feel tomorrow.",
    "Author": ""
},
"time": "0.14 s"

}

Problem: 2 I dont know how to parse this response in textview

object ServiceBuilder {

private val client = OkHttpClient.Builder().build()

private val retrofit = Retrofit.Builder()
    .baseUrl("https://fitflex.switchsolutions.com.pk/") // change this IP for testing by your actual machine IP

    .addConverterFactory(GsonConverterFactory.create())
    .client(client)
    .build()

fun<T> buildService(service: Class<T>): T{
    return retrofit.create(service)
}}

RestApi

interface  RestApi{
@Headers("Content-Type: application/json")
@POST("api/getquotes")
abstract fun addUser(@Body userData: UserInfo): Call<UserInfo>}

RestAPiService

class RestApiService
{
    fun addUser(userData: UserInfo, onResult: (UserInfo?) -> Unit)
    {
        val retrofit = ServiceBuilder.buildService(RestApi::class.java)
        retrofit.addUser(userData).enqueue(
            object : Callback<UserInfo>
            {
                override fun onFailure(call: Call<UserInfo>, t: Throwable)
                {
                    onResult(null)
                }

                override fun onResponse( call: Call<UserInfo>, response: Response<UserInfo>)
                {
                    val addedUser = response.body()
                    Log.d("responsee","" addedUser)
                    onResult(addedUser)
                }
            }
        )
    }
}

UserInfo

data class UserInfo (

    @SerializedName("Quote")
    val quote : String,

    @SerializedName("Author")
    val author : String
)

MainActivity

 fun getQuotes() {
        val apiService = RestApiService()
        val userInfo = UserInfo("","")

        apiService.addUser(userInfo) {
            Log.d("Error registering user","errter")
            /*if ( != null)
            {
                // it = newly added user parsed as response
                // it?.id = newly added user ID
            } else {
                Log.d("Error registering user","errter")
            }*/
        }
    }

Any help would be appreciated :)

CodePudding user response：

just follow my steps :

File->settings->Plugins

search for JSON To Kotlin class and install it

again click on File->New->Kotlin Data class from JSON

paste your json code here and click on generate. It will generate POJO classes and you will good to go.

CodePudding user response：

The first thing I noticed, is that the data in your json is:

"Quote": "The pain you feel today will be the strength you feel tomorrow.",
"Author": ""

While your UserInfo defined @SerializedName("message") for Quote.

CodePudding user response：

Status, message and data are all part of the response so you need to take care of that. For example this

data class AddUserResponse(
    val `data`: UserInfo, //like you defined it
    val message: String,
    val status: Int,
    val time: String
)

This means parameter and response are different so the RestApi needs to be changed to this

abstract fun addUser(@Body userData: UserInfo): Call<AddUserResponse>}

This in turn also change the types in the service like

class RestApiService
{
    fun addUser(userData: UserInfo, onResult: (UserInfo?) -> Unit)
    {
        val retrofit = ServiceBuilder.buildService(RestApi::class.java)
        retrofit.addUser(userData).enqueue(
            object : Callback<AddUserResponse>
            {
                override fun onFailure(call: Call<AddUserResponse>, t: Throwable)
                {
                    onResult(null)
                }

                override fun onResponse( call: Call<AddUserResponse>, response: Response<AddUserResponse>)
                {
                    val addedUser = response.body()
                    Log.d("responsee","" addedUser)
                    onResult(addedUser.data)
                }
            }
        )
    }
}

now in getQuotes you will have that it is a UserInfo object

    apiService.addUser(userInfo) {
        val returnedUserInfo = it
    }