Android Activity Lifecycle

MainActivity.kt

package com.example.android.lifecycle

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.util.Log

// When the Activity first time loads the events called are:
// onCreate(), onStart(), onResume()

// When click on home button, the Activity goes to the background
// The events called are:
// onPause(), onStop()

// Return to the Activity, the events called are:
// onRestart(), onStart(), onResume()

// When click the back button, the events called are:
// onPause(), onStop(), onDestroy()

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        Log.v("MainActivity", "LifeCycleEvents: onCreate")
    }

    override fun onStart() {
        super.onStart()
        Log.v("MainActivity", "LifeCycleEvents: onStart")
    }

    override fun onRestart() {
        super.onRestart()
        Log.v("MainActivity", "LifeCycleEvents: onRestart")
    }

    override fun onResume() {
        super.onResume()
        Log.v("MainActivity", "LifeCycleEvents: onResume")
    }

    override fun onPause() {
        super.onPause()
        Log.v("MainActivity", "LifeCycleEvents: onPause")
    }

    override fun onStop() {
        super.onStop()
        Log.v("MainActivity", "LifeCycleEvents: onStop")
    }

    override fun onDestroy() {
        super.onDestroy()
        Log.v("MainActivity", "LifeCycleEvents: onDestroy")
    }
}