Nsryjdtyk

I have the following class User that extends the BaseResponse class. I
am getting a type mismatch error:

Required => String

Found => String.Companion

for return apiKey

package com.touchsides.rxjavanetworking.network.model



import com.google.gson.annotations.SerializedName



class User: BaseResponse()

{



    @SerializedName("api_key")

    val apiKey = String



    fun getApiKey(): String

    {

        return  apiKey

    }

}



abstract class BaseResponse(var error: String?=null)

{





}

How is the current implementation of this wrong

A complete answer is that your code should look like this:

class User: BaseResponse()

{

    @SerializedName("api_key")

    lateinit var apiKey: String  // must be set by something before being read

}



abstract class BaseResponse(var error: String?=null) {

}

You do not need a default value for the apiKey property if you intend to set it via deserialization later, if not then you should also add a default value as below. The getApiKey() method is removed because you do not need that in Kotlin, all properties have automatically generated getters built-in and by adding your own you would end up with a conflict between the generated getter and the one you manually created (two methods with the same name, same signature).

If you do need a default value for apiKey then stay with a var so that deserialization can work (if you intend to do that) and add a default empty string or make it a nullable string and set it to null.

class User: BaseResponse()

{

    @SerializedName("api_key")

    var apiKey: String = ""     // if you want a default regardless, or make it nullable and null

}



abstract class BaseResponse(var error: String?=null) {}

You used = instead : while declaration of api_key (apiKey = String). Which actually means you are initialising api_key with String.Companion Object.

And you don't need to create getApiKey() (getter) method as by default you will have getter method for your properties.

class User : BaseResponse() {



    @SerializedName("api_key")

    var apiKey: String? = null

        private set



}



abstract class BaseResponse(var error: String? = null)

in fact you can use data class for this purposes

data class User(@SerializedName("api_key") val apiKey: String):BaseResponse()



fun main(args: Array<String>) {

    Gson().fromJson<User>("{"api_key":"my api key"}", User::class.java).let {

        println(it.apiKey)

    }

}

You're stuck with the way Java do things. In kotlin when defining Getter and Setter, you don't have to write them yourself. Once you declare a variable, both methods would be automatically created.

EDIT: So delete the getter in your POJO class.