Cara Menampilkan Data dari Database Menggunakan Kotlin

<!-- mahasiswa.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="wrap_content"
    android:orientation="vertical"
    tools:context=".Mahasiswa"
    android:padding="10dp">
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv_mahasiswa"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:listitem="@layout/mahasiswa_item"></androidx.recyclerview.widget.RecyclerView>
</LinearLayout>

// Mahasiswa.kt
class Mahasiswa : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.mahasiswa)
        val rv_mahasiswa:RecyclerView = findViewById(R.id.rv_mahasiswa)
        val nama:MutableList<String> = mutableListOf()
        val nim:MutableList<String> = mutableListOf()
        val foto:MutableList<Int> = mutableListOf()
        // Panggil database kampus
        val dbkampus:SQLiteDatabase = openOrCreateDatabase("kampus", MODE_PRIVATE, null)
        // Gali data mahasiswa
        val gali_mahasiswa = dbkampus.rawQuery("SELECT * FROM mahasiswa", null)
        while (gali_mahasiswa.moveToNext()) {
            nama.add(gali_mahasiswa.getString(0))
            nim.add(gali_mahasiswa.getString(1))
            foto.add(R.drawable.noimage)
        }
        val mi = Mahasiswa_Item(nama, nim, foto)
        rv_mahasiswa.adapter = mi
        rv_mahasiswa.layoutManager = GridLayoutManager(this, 2)
    }
}

// Mahasiswa_item.kt
class Mahasiswa_Item (val nama:MutableList<String>, val nim:MutableList<String>, val foto:MutableList<Int>) : RecyclerView.Adapter<Mahasiswa_Item.ViewHolder>() {
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): Mahasiswa_Item.ViewHolder {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.mahasiswa_item, parent, false)
        return ViewHolder(view)
    }
    class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        val txt_nama:TextView = itemView.findViewById(R.id.txt_nama)
        val txt_nim:TextView = itemView.findViewById(R.id.txt_nim)
        val iv_foto:ImageView = itemView.findViewById(R.id.iv_foto)
    }
    override fun getItemCount(): Int {
        return nama.size
    }
    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        holder.txt_nama.text = nama[position]
        holder.txt_nim.text = nim[position]
        holder.iv_foto.setImageResource(foto[position])
    }
}