circle_button.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="oval">
            <solid android:color="#F29F05"/>
            <size android:width="80dp"
                android:height="80dp"/>
        </shape>
    </item>
</selector>

currency.kt

package com.ess.currencyapp.model
import com.google.gson.annotations.SerializedName

data class Currency(
    @SerializedName("base")
    val base: String,
    @SerializedName("date")
    val date: String,
    @SerializedName("rates")
    val rates: Rates
)

data class Rates(
    val AUD: Double,
    val BGN: Double,
    val BRL: Double,
    val CAD: Double,
    val CHF: Double,
    val CNY: Double,
    val CZK: Double,
    val DKK: Double,
    val GBP: Double,
    val HKD: Double,
    val HRK: Double,
    val HUF: Double,
    val IDR: Double,
    val ILS: Double,
    val INR: Double,
    val ISK: Double,
    val JPY: Double,
    val KRW: Double,
    val MXN: Double,
    val MYR: Double,
    val NOK: Double,
    val NZD: Double,
    val PHP: Double,
    val PLN: Double,
    val RON: Double,
    val RUB: Double,
    val SEK: Double,
    val SGD: Double,
    val THB: Double,
    val TRY: Double,
    val USD: Double,
    val ZAR: Double
)

currencyapi.kt

package com.ess.currencyapp.service

import com.ess.currencyapp.model.Currency
import retrofit2.Call
import retrofit2.http.GET

interface CurrencyAPI {

    @GET("/latest")
    fun getCurrency() : Call<Currency>
}

currencyrecyclerviewadapter.kt

package com.ess.currencyapp.adapter

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView
import com.ess.currencyapp.R
import kotlinx.android.synthetic.main.item_currency.view.*

class CurrencyRecyclerViewAdapter(private val currencyNameList: ArrayList<String>, private val currencyValueList: ArrayList<Double>)
    : RecyclerView.Adapter<CurrencyRecyclerViewAdapter.RowHolder>() {

    class RowHolder(view: View) : RecyclerView.ViewHolder(view){
        fun bind(currencyName: String,currencyValue: Double){
            itemView.currency_name.text = currencyName
            itemView.currency_value.text = currencyValue.toString()
        }
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RowHolder {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.item_currency,parent,false)

        return RowHolder(view)
    }

    override fun getItemCount(): Int {
        return currencyNameList.count()
    }

    override fun onBindViewHolder(holder: RowHolder, position: Int) {
        holder.bind(currencyNameList[position],currencyValueList[position])
    }
}

home_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".view.HomeFragment"
    android:background="#180E26">

    <LinearLayout
        android:layout_margin="10dp"
        android:id="@+id/euro_title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="horizontal">
        <ImageView
            android:layout_width="75dp"
            android:layout_height="75dp"
            android:src="@drawable/euro"/>
        <TextView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:textAlignment="center"
            android:gravity="center"
            android:textColor="#F29F05"
            android:text="EURO EXCHANGE"
            android:textSize="28dp"/>
    </LinearLayout>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/currencyList"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="1dp"
        />
</LinearLayout>

homefragment.kt

package com.ess.currencyapp.view

import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.recyclerview.widget.LinearLayoutManager
import com.ess.currencyapp.R
import com.ess.currencyapp.adapter.CurrencyRecyclerViewAdapter
import com.ess.currencyapp.model.Currency
import com.ess.currencyapp.model.Rates
import com.ess.currencyapp.service.CurrencyAPI
import kotlinx.android.synthetic.main.fragment_home.*
import retrofit2.Call
import retrofit2.Callback
import retrofit2.Response
import retrofit2.Retrofit
import retrofit2.converter.gson.GsonConverterFactory


class HomeFragment : Fragment() {

    val BASE_URL = "https://api.exchangeratesapi.io/"

    val currencyNames : ArrayList<String> = arrayListOf("AUD","BGN","BRL","CAD","CHF","CNY","CZK","DKK","GBP","HKD","HRK","HUF","IDR",
    "ILS","INR","ISK","JPY","KRW","MXN","MYR","NOK","NZD","PHP","PLN","RON","RUB","SEK","SGD","THB","TRY","USD","ZAR")
    val currencyValues: ArrayList<Double> = arrayListOf()
    var currencyRecyclerViewAdapter: CurrencyRecyclerViewAdapter? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)


    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_home, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        currencyList.layoutManager = LinearLayoutManager(context)
        getCurrencyRates()
    }

    fun getCurrencyRates(){
        val retrofit = Retrofit.Builder()
            .baseUrl(BASE_URL)
            .addConverterFactory(GsonConverterFactory.create())
            .build()

        val service = retrofit.create(CurrencyAPI::class.java)
        val call = service.getCurrency()

        call.enqueue(object : Callback<Currency>{
            override fun onFailure(call: Call<Currency>, t: Throwable) {
                t.printStackTrace()
            }

            override fun onResponse(call: Call<Currency>, response: Response<Currency>) {
                if(response.isSuccessful){
                    response.body()?.let {
                        addAllCurrencyValues(it.rates)
                        currencyRecyclerViewAdapter = CurrencyRecyclerViewAdapter(currencyNames,currencyValues)
                        currencyList.adapter = currencyRecyclerViewAdapter
                    }
                }
            }

        })
    }

    fun addAllCurrencyValues(rateModel: Rates){
            currencyValues.add(rateModel.AUD)
            currencyValues.add(rateModel.BGN)
            currencyValues.add(rateModel.BRL)
            currencyValues.add(rateModel.CAD)
            currencyValues.add(rateModel.CHF)
            currencyValues.add(rateModel.CNY)
            currencyValues.add(rateModel.CZK)
            currencyValues.add(rateModel.DKK)
            currencyValues.add(rateModel.GBP)
            currencyValues.add(rateModel.HKD)
            currencyValues.add(rateModel.HRK)
            currencyValues.add(rateModel.HUF)
            currencyValues.add(rateModel.IDR)
            currencyValues.add(rateModel.ILS)
            currencyValues.add(rateModel.INR)
            currencyValues.add(rateModel.ISK)
            currencyValues.add(rateModel.JPY)
            currencyValues.add(rateModel.KRW)
            currencyValues.add(rateModel.MXN)
            currencyValues.add(rateModel.MYR)
            currencyValues.add(rateModel.NOK)
            currencyValues.add(rateModel.NZD)
            currencyValues.add(rateModel.PHP)
            currencyValues.add(rateModel.PLN)
            currencyValues.add(rateModel.RON)
            currencyValues.add(rateModel.RUB)
            currencyValues.add(rateModel.SEK)
            currencyValues.add(rateModel.SGD)
            currencyValues.add(rateModel.THB)
            currencyValues.add(rateModel.TRY)
            currencyValues.add(rateModel.USD)
            currencyValues.add(rateModel.ZAR)
    }
}

item_currency.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:padding="10dp">

    <Button
        android:id="@+id/currency_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/circle_button"
        android:textColor="#180E26"
        android:text="TRY"/>

    <TextView
        android:id="@+id/currency_value"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:text="8.5019"
        android:textAlignment="center"
        android:textColor="#F29F05"
        android:textSize="24dp" />
</LinearLayout>

Libraries.kt

def retrofitVersion = '2.8.1'
def rxJavaVersion = '2.1.1'

implementation "com.squareup.retrofit2:retrofit:$retrofitVersion"
implementation "com.squareup.retrofit2:converter-gson:$retrofitVersion"
implementation "com.squareup.retrofit2:adapter-rxjava2:$retrofitVersion"

implementation "io.reactivex.rxjava2:rxjava:$rxJavaVersion"
implementation "io.reactivex.rxjava2:rxandroid:$rxJavaVersion"