activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/app_bar"
        android:layout_width="match_parent"
        android:layout_height="100dp">

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:src="@drawable/ic_image" />

    </android.support.design.widget.AppBarLayout>

    <android.support.v7.widget.RecyclerView
    android:id="@+id/rv_animal_list"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />


</android.support.design.widget.CoordinatorLayout>

AnimalAdapter.kt

class AnimalAdapter(val items: ArrayList<String>, val context: Context) : RecyclerView.Adapter<ViewHolder>() {

    // Gets the number of animals in the list
    override fun getItemCount(): Int {
        return items.size
    }

    // Inflates the item views
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        return ViewHolder(LayoutInflater.from(context).inflate(R.layout.animal_list_item, parent, false))
    }

    // Binds each animal in the ArrayList to a view
    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        holder.tvAnimalType.setText(items[position])
    }
}

class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
    // Holds the TextView that will add each animal to
    val tvAnimalType = view.tv_animal_type
}

MainActivity.kt

package com.b5eg.sergburlaka.keyboard

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.support.v7.widget.LinearLayoutManager
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

    // Initializing an empty ArrayList to be filled with animals
    private val animals: ArrayList<String> = ArrayList()

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

        // Loads animals into the ArrayList
        addAnimals()

        // Creates a vertical Layout Manager
        rv_animal_list.layoutManager = LinearLayoutManager(this)

        // You can use GridLayoutManager if you want multiple columns. Enter the number of columns as a parameter.
//        rv_animal_list.layoutManager = GridLayoutManager(this, 2)

        // Access the RecyclerView Adapter and load the data into it
        rv_animal_list.adapter = AnimalAdapter(animals, this)
    }

    // Adds animals to the empty animals ArrayList
    private fun addAnimals() {
        animals.add("dog")
        animals.add("cat")
        animals.add("owl")
        animals.add("cheetah")
        animals.add("raccoon")
        animals.add("bird")
        animals.add("snake")
        animals.add("lizard")
        animals.add("hamster")
        animals.add("bear")
        animals.add("lion")
        animals.add("tiger")
        animals.add("horse")
        animals.add("frog")
        animals.add("fish")
        animals.add("shark")
        animals.add("turtle")
        animals.add("elephant")
        animals.add("cow")
        animals.add("beaver")
        animals.add("bison")
        animals.add("porcupine")
        animals.add("rat")
        animals.add("mouse")
        animals.add("goose")
        animals.add("deer")
        animals.add("fox")
        animals.add("moose")
        animals.add("buffalo")
        animals.add("monkey")
        animals.add("penguin")
        animals.add("parrot")
    }
}