[Kotlin]ラジオボタンの生成

package com.seeking_star.test.ui.main

import android.content.Intent
import androidx.lifecycle.ViewModelProvider
import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Button
import android.widget.RadioGroup
import com.seeking_star.test.R
import com.seeking_star.test.SubActivity

class MainFragment : Fragment() {

    companion object {
        fun newInstance() = MainFragment()

        val MAGIC_TYPE = "com.seeking_star.test.MainFragment.MagicType"
    }

    private lateinit var viewModel: MainViewModel

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        viewModel = ViewModelProvider(this).get(MainViewModel::class.java)
        // TODO: Use the ViewModel
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        var view = inflater.inflate(R.layout.fragment_main, container, false)

        view.findViewById<Button>(R.id.decideButton).setOnClickListener {
            val selected = view.findViewById<RadioGroup>(R.id.magicTypeGroup).checkedRadioButtonId
            var intent = Intent(context, SubActivity::class.java)
            intent.putExtra(MAGIC_TYPE, selected)
            startActivity(intent)
            activity?.overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out)
        }

        return view
    }
}

<?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:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ui.main.MainFragment">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:gravity="center">

        <TextView
            android:id="@+id/textView2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="魔法の属性を選択してください"
            android:textSize="24dp" />

        <RadioGroup
            android:id="@+id/magicTypeGroup"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <RadioButton
                android:id="@+id/radioFire"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="メラ" />

            <RadioButton
                android:id="@+id/radioIce"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="ヒャド" />

            <RadioButton
                android:id="@+id/radioWind"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="バギ" />

            <RadioButton
                android:id="@+id/radioElectric"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="デイン" />

            <RadioButton
                android:id="@+id/radioBomb"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="イオ" />

            <RadioButton
                android:id="@+id/radioDark"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="ドルマ" />

        </RadioGroup>

        <Button
            android:id="@+id/decideButton"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dp"
            android:text="決定" />

    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>