Change name of MainActivity to more fitting MessageListActivity

app/src/main/AndroidManifest.xml

@@ -10,14 +10,14 @@
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
         <activity android:name=".DisplayMessageActivity"
-            android:parentActivityName=".MainActivity">
+            android:parentActivityName=".MessageListActivity">
             <!-- The meta-data tag is required if you support API level 15 and lower -->
             <meta-data
                 android:name="android.support.PARENT_ACTIVITY"
-                android:value=".MainActivity" />
+                android:value=".MessageListActivity" />
         </activity>
 
-        <activity android:name=".MainActivity">
+        <activity android:name=".MessageListActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 

app/src/main/java/com/example/myfirstapp/MessageListActivity.kt

@@ -9,7 +9,7 @@ import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import kotlin.collections.ArrayList
 
-class MainActivity : AppCompatActivity() {
+class MessageListActivity : AppCompatActivity() {
     private lateinit var recyclerView: RecyclerView
     private lateinit var viewAdapter: RecyclerView.Adapter<*>
     private lateinit var spinner: Spinner
@@ -25,7 +25,7 @@ class MainActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_main)
+        setContentView(R.layout.activity_message_list)
 
         val viewManager = LinearLayoutManager(this)
         viewManager.stackFromEnd = true

app/src/main/res/layout/activity_message_list.xml

@@ -4,7 +4,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context=".MainActivity">
+    tools:context=".MessageListActivity">
 
     <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/messageList"