21.3 Overriding the Activity Lifecycle Methods

At this point, the project contains a single activity named MainActivity, which is derived from the Android AppCompatActivity class. The source code for this activity is contained within the MainActivity.kt file which should already be open in an editor session and represented by a tab in the editor tab bar. In the event that the file is no longer open, navigate to it in the Project tool window panel (app -> java -> com.ebookfrenzy.statechange -> MainActivity) and double-click on it to load the file into the editor. Once loaded the code should read as follows:

package com.ebookfrenzy.statechange

 

import androidx.appcompat.app.AppCompatActivity

import android.os.Bundle

 

class MainActivity : AppCompatActivity() {

 

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

  ...