Android Hello World Kotlin App for Beginners

In this tutorial, we will learn how to create a Hello World Android app in Kotlin on Android studio using Kotlin programming language.

Start Hello World Android Application by starting Android Studio.

Select the Activity type and click next.

Setup Project

Provide an application name ('Hello World' in my case) and check 'Include Kotlin support' and proceed also Select Minimum SDK for android application and click finish.

Kotlin Android App Project Structure

Look at XML design layout

Android Hello World Kotlin Code

Let’s look at the layout file i.e. activity_main.xml looks like:

<?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:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

Let’s look at the MainActivity.kt file as shown below.

package com.examlpe.helloworld

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }
}

Running Our Hello World App

Following is the output of our application when running on a device.