add RecyclerView

app/src/main/java/world/whatever/task_roomdb/MainActivity.kt

@@ -2,10 +2,16 @@ package world.whatever.task_roomdb
 
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
 
 class MainActivity : AppCompatActivity() {
 	override fun onCreate(savedInstanceState: Bundle?) {
 		super.onCreate(savedInstanceState)
 		setContentView(R.layout.activity_main)
+		val recyclerView = findViewById<RecyclerView>(R.id.recyclerview)
+		val adapter = WordListAdapter()
+		recyclerView.adapter = adapter
+		recyclerView.layoutManager = LinearLayoutManager(this)
 	}
 }

app/src/main/java/world/whatever/task_roomdb/WordListAdapter.kt

@@ -0,0 +1,47 @@
+package world.whatever.task_roomdb
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.recyclerview.widget.DiffUtil
+import androidx.recyclerview.widget.ListAdapter
+import androidx.recyclerview.widget.RecyclerView
+
+class WordListAdapter : ListAdapter<Word, WordListAdapter.WordViewHolder>(WordsComparator()) {
+
+	override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): WordViewHolder {
+		return WordViewHolder.create(parent)
+	}
+
+	override fun onBindViewHolder(holder: WordViewHolder, position: Int) {
+		val current = getItem(position)
+		holder.bind(current.word)
+	}
+
+	class WordViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
+		private val wordItemView: TextView = itemView.findViewById(R.id.textView)
+
+		fun bind(text: String?) {
+			wordItemView.text = text
+		}
+
+		companion object {
+			fun create(parent: ViewGroup): WordViewHolder {
+				val view: View = LayoutInflater.from(parent.context)
+					.inflate(R.layout.recyclerview_item, parent, false)
+				return WordViewHolder(view)
+			}
+		}
+	}
+
+	class WordsComparator : DiffUtil.ItemCallback<Word>() {
+		override fun areItemsTheSame(oldItem: Word, newItem: Word): Boolean {
+			return oldItem === newItem
+		}
+
+		override fun areContentsTheSame(oldItem: Word, newItem: Word): Boolean {
+			return oldItem.word == newItem.word
+		}
+	}
+}