show toast to learn activity lifecycle

MainActivity.kt

package com.mikkipastel.example

import android.content.Intent
import android.os.Bundle
import android.util.Log
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import com.mikkipastel.mlbarcode.databinding.ActivityMainBinding

class MainActivity: AppCompatActivity() {
    private lateinit var binding: ActivityMainBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)
        Toast.makeText(this, "MainActivity: onCreate", Toast.LENGTH_SHORT).show()
    }

    override fun onStart() {
        super.onStart()
        Toast.makeText(this, "MainActivity: onStart", Toast.LENGTH_SHORT).show()
    }

    override fun onResume() {
        super.onResume()
        Toast.makeText(this, "MainActivity: onResume", Toast.LENGTH_SHORT).show()
    }

    override fun onPause() {
        super.onPause()
        Toast.makeText(this, "MainActivity: onPause", Toast.LENGTH_SHORT).show()
    }

    override fun onStop() {
        super.onStop()
        Toast.makeText(this, "MainActivity: onStop", Toast.LENGTH_SHORT).show()
    }

    override fun onRestart() {
        super.onRestart()
        Toast.makeText(this, "MainActivity: onRestart", Toast.LENGTH_SHORT).show()
    }

    override fun onDestroy() {
        super.onDestroy()
        Toast.makeText(this, "MainActivity: onDestroy", Toast.LENGTH_SHORT).show()
    }
}

SecondActivity.kt

package com.mikkipastel.example

import android.os.Bundle
import android.util.Log
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import com.mikkipastel.example.databinding.ActivitySecondBinding

class SecondActivity: AppCompatActivity() {

    private lateinit var binding: ActivitySecondBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivitySecondBinding.inflate(layoutInflater)
        Toast.makeText(this, "SecondActivity: onCreate", Toast.LENGTH_SHORT).show()
    }

    override fun onStart() {
        super.onStart()
        Toast.makeText(this, "SecondActivity: onStart", Toast.LENGTH_SHORT).show()
    }

    override fun onResume() {
        super.onResume()
        Toast.makeText(this, "SecondActivity: onResume", Toast.LENGTH_SHORT).show()
    }

    override fun onPause() {
        super.onPause()
        Toast.makeText(this, "SecondActivity: onPause", Toast.LENGTH_SHORT).show()
    }

    override fun onStop() {
        super.onStop()
        Toast.makeText(this, "SecondActivity: onStop", Toast.LENGTH_SHORT).show()
    }

    override fun onRestart() {
        super.onRestart()
        Toast.makeText(this, "SecondActivity: onRestart", Toast.LENGTH_SHORT).show()
    }

    override fun onDestroy() {
        super.onDestroy()
        Toast.makeText(this, "SecondActivity: onDestroy", Toast.LENGTH_SHORT).show()
    }
}