ACTIVITY_MAIN.XML:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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">

<TextView
        android:id="@+id/textview"
        android:layout_width="303dp"
        android:layout_height="66dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="ACTIVITY LIFE CYCLE METHODS"
       app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>

MAINACTIVITY.kt 

package com.example.myapp_activitylifecyclemethods 
import androidx.appcompat.app.AppCompatActivity 
import android.os.Bundle 
import android.widget.Toast 
class MainActivity : AppCompatActivity() 
{ 
override fun onCreate(savedInstanceState: Bundle?)
 { 
super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) Toast.makeText(applicationContext,"ONCREATE() CALLED",Toast.LENGTH_SHORT).show() 
} 
override fun onStart() 
{
 super.onStart() 
Toast.makeText(applicationContext,"ONSTART() CALLED",Toast.LENGTH_SHORT).show() 
} 
override fun onRestart() 
{ 
super.onRestart() 
Toast.makeText(applicationContext,"ONRESTART() CALLED",Toast.LENGTH_SHORT).show() 
} 
override fun onResume() 
{ 
super.onResume()
 Toast.makeText(applicationContext,"ONRESUME() CALLED",Toast.LENGTH_SHORT).show()
 }
 override fun onPause() 
{ 
super.onPause()
 Toast.makeText(applicationContext,"ONPAUSE() CALLED",Toast.LENGTH_SHORT).show() 
} 
override fun onStop() 
{ 
super.onStop() 
Toast.makeText(applicationContext,"ONSTOP() CALLED",Toast.LENGTH_SHORT).show()
 } 
fun onDestroy() 
{ 
super.onDestroy() 
Toast.makeText(applicationContext,"ONDESTROY() CALLED",Toast.LENGTH_SHORT).show() 
} 
}