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="wrap_content"
        android:layout_height="wrap_content"
        android:text="LIFE CYCLE"
        android:textSize="18sp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintVertical_bias="0.5"
        app:layout_constraintHorizontal_bias="0.5"
        tools:ignore="MissingConstraints" />
 
</androidx.constraintlayout.widget.ConstraintLayout>
*******
     main activity.kt
*****
       package com.example.myapplication
 
 
 
import android.os.Bundle
import android.widget.Toast
import androidx.activity.ComponentActivity
import androidx.appcompat.app.AppCompatActivity
import androidx.core.view.WindowCompat
 
class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        WindowCompat.setDecorFitsSystemWindows(window, false) // Enables edge-to-edge
        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 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()
    }
 
    override fun onDestroy() {
        super.onDestroy()
        Toast.makeText(applicationContext, "onDestroy() called", Toast.LENGTH_SHORT).show()
    }
}
******