Implementação do adapter

Pessoal help please!!

Revisei o código várias vezes mas não consigo implementar o adapter. Quando executo o app ele build sem erros e carrega o app, mas não exibe os blocos em branco conforme a aula.

ListaTransacoesAdapter.kt:

package br.com.lweb.financaskotlin.ui.adapter

import android.content.Context import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import android.widget.BaseAdapter import br.com.lweb.financaskotlin.R

class ListaTransacoesAdapter(transacoes: List, context: Context) : BaseAdapter() {

private val transacoes = transacoes
private val context = context

override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {
    return LayoutInflater.from(context).inflate(R.layout.transacao_item, parent, false)
}

override fun getItem(position: Int): String {
    return transacoes[position]
}

override fun getItemId(position: Int): Long {
    return 0
}

override fun getCount(): Int {
    return transacoes.size
}

}

ListaTransacoesActivity.kt:

package br.com.lweb.financaskotlin.ui.activity

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.widget.ArrayAdapter
import br.com.lweb.financaskotlin.R
import kotlinx.android.synthetic.main.activity_lista_transacoes.*

class ListaTransacoesActivity : AppCompatActivity(){

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

        val transacoes = listOf("Comida - R$ 20,50")

        val arrayAdapter = ArrayAdapter(this, android.R.layout.simple_list_item_1, transacoes)

        lista_transacoes_listview.adapter = arrayAdapter
    }
}