Retrofit2 en Android usando Kotlin

data class Movie(
    var name: String? = null,
    var realname: String? = null,
    var team: String? = null,
    var firstapperance: String? = null,
    var createdby: String? = null,
    var publisher: String? = null,
    var imageurl: String? = null,
    var bio: String? = null
)

import retrofit2.Retrofit
import retrofit2.converter.gson.GsonConverterFactory

object RetrofitClient {
    private var retrofit: Retrofit? = null

    fun getClient(baseUrl: String): Retrofit {
        if (retrofit == null) {
            retrofit = Retrofit.Builder()
                .baseUrl(baseUrl)
                .addConverterFactory(GsonConverterFactory.create())
                .build()
        }
        return retrofit!!
    }
}

import com.example.retrofitmarvel.Model.Movie
import retrofit2.Call
import retrofit2.http.*

interface RetrofitServices {
    @GET("marvel")
    fun getMovieList(): Call<MutableList<Movie>>
}

import com.example.retrofitmarvel.Interface.RetrofitServices
import com.example.retrofitmarvel.Retrofit.RetrofitClient

object Common {
    private val BASE_URL = "https://www.simplifiedcoding.net/demos/"
    val retrofitService: RetrofitServices
        get() = RetrofitClient.getClient(BASE_URL).create(RetrofitServices::class.java)
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerMovieList"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

<androidx.cardview.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:cardElevation="8dp"
    android:layout_margin="8dp">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/linearLayout"
        android:layout_width="match_parent"
        android:layout_height="167dp">


        <ImageView
            android:id="@+id/image_movie"
            android:layout_width="0dp"
            android:layout_height="100dp"
            android:layout_marginEnd="8dp"
            android:layout_marginRight="8dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toStartOf="@+id/txt_name"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.238" />

        <TextView
            android:id="@+id/txt_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="192dp"
            android:layout_marginLeft="192dp"
            android:layout_marginTop="16dp"
            android:text="name"
            android:textColor="@android:color/black"
            android:textSize="20sp"
            android:textStyle="bold"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <TextView
            android:id="@+id/txt_team"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="196dp"
            android:layout_marginLeft="196dp"
            android:layout_marginTop="8dp"
            android:text="team"
            android:textColor="@android:color/black"
            android:textSize="16sp"
            android:textStyle="normal"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/txt_name" />

        <TextView
            android:id="@+id/txt_createdby"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="184dp"
            android:layout_marginLeft="184dp"
            android:layout_marginTop="12dp"
            android:text="createdby"
            android:textColor="@android:color/black"
            android:textSize="18sp"
            android:textStyle="italic"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/txt_team" />


    </androidx.constraintlayout.widget.ConstraintLayout>

</androidx.cardview.widget.CardView>

import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import android.widget.Toast
import androidx.recyclerview.widget.RecyclerView
import com.example.retrofitmarvel.Model.Movie
import com.example.retrofitmarvel.R
import com.squareup.picasso.Picasso
import kotlinx.android.synthetic.main.item_layout.view.*

class MyMovieAdapter(private val context: Context,private val movieList: MutableList<Movie>):RecyclerView.Adapter<MyMovieAdapter.MyViewHolder>() {

    class MyViewHolder(itemView: View): RecyclerView.ViewHolder(itemView){
        val image: ImageView = itemView.image_movie
        val txt_name: TextView = itemView.txt_name
        val txt_team: TextView = itemView.txt_team
        val txt_createdby: TextView = itemView.txt_createdby

        fun bind(listItem: Movie) {
            image.setOnClickListener {
                Toast.makeText(it.context, "  ${itemView.image_movie}", Toast.LENGTH_SHORT)
                    .show()
            }
            itemView.setOnClickListener {
                Toast.makeText(it.context, "  ${itemView.txt_name.text}", Toast.LENGTH_SHORT).show()
            }
        }
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
        val itemView = LayoutInflater.from(parent.context).inflate(R.layout.item_layout, parent, false)
        return MyViewHolder(itemView)
    }

    override fun getItemCount() = movieList.size

    override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
        val listItem = movieList[position]
        holder.bind(listItem)

        Picasso.get().load(movieList[position].imageurl).into(holder.image)
        holder.txt_name.text = movieList[position].name
        holder.txt_team.text = movieList[position].team
        holder.txt_createdby.text = movieList[position].createdby
    }

}

import android.app.AlertDialog
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.recyclerview.widget.LinearLayoutManager
import com.example.retrofitmarvel.Adapter.MyMovieAdapter
import com.example.retrofitmarvel.Common.Common
import com.example.retrofitmarvel.Interface.RetrofitServices
import com.example.retrofitmarvel.Model.Movie
import com.example.retrofitmarvel.R

import dmax.dialog.SpotsDialog
import kotlinx.android.synthetic.main.activity_main.*
import retrofit2.Call
import retrofit2.Callback
import retrofit2.Response

class MainActivity : AppCompatActivity() {

    lateinit var mService: RetrofitServices
    lateinit var layoutManager: LinearLayoutManager
    lateinit var adapter: MyMovieAdapter
    lateinit var dialog: AlertDialog

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        mService = Common.retrofitService
        recyclerMovieList.setHasFixedSize(true)
        layoutManager = LinearLayoutManager(this)
        recyclerMovieList.layoutManager = layoutManager
        dialog = SpotsDialog.Builder().setCancelable(true).setContext(this).build()

        getAllMovieList()
    }

    private fun getAllMovieList() {
        dialog.show()
        mService.getMovieList().enqueue(object : Callback<MutableList<Movie>> {
            override fun onFailure(call: Call<MutableList<Movie>>, t: Throwable) {

            }

            override fun onResponse(call: Call<MutableList<Movie>>, response: Response<MutableList<Movie>>) {
                adapter = MyMovieAdapter(baseContext, response.body() as MutableList<Movie>)
                adapter.notifyDataSetChanged()
                recyclerMovieList.adapter = adapter

                dialog.dismiss()
            }
        })
    }
}