3.Create “Hello World” application. That will display “Hello World” in the middle of the screen in the red color with white background.

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="MAD LAB”
        android:textColor=”#289428”  
        android:textAllCaps=”true”
        android:textSize=”20dp” 
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>

MAINACTIVITY.kt 

package com.example.helloworld 
import androidx.appcompat.app.AppCompatActivity 
import android.os.Bundle 
//Bundle is a class in android studio used to transfer data from one UI component activity to another UI component activity to another UI component activity.

import android.widget.Toast 
class MainActivity : AppCompatActivity() 
{ 
  override fun onCreate(savedInstanceState: Bundle?)
 { 
//Bundle defines 2 methods onFreeze() and onCreate() 
onFreeze() assigns value to UI component in design phase and
onCreate() takes parameter of component during runtime
super.onCreate(savedInstanceState) setContentView(R.layout.activity_main)
//R is a resource set in activity_main.xml and used in kt file with resource id
}
}