Kotlin Hello World App

by Online Tutorials Library July 14, 2022

Kotlin Hello World App

Let?s develop a first hello word application on Android studio using Kotlin programming language. To develop android application launch Android Studio and select option ‘Start a new Android Studio project’.

Provide a application name (‘Hello World’ in my case) and check ‘Include Kotlin support’ and proceed.

Kotlin Hello World App 2

Select API level for android application and click next.

Kotlin Hello World App 3

Select Activity type and click next.

Kotlin Hello World App 4

activity_main.xml

Create an activity_main.xml file in layout folder and add the following code.

  <?xml version=”1.0″ encoding=”utf-8″?>  <android.support.constraint.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=”example.app.tutoraspire.helloworld.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” />    </android.support.constraint.ConstraintLayout>  

MainActivity.kt

Create MainActivity.kt file in example.app.tutoraspire.helloworld package add the following code.

  package example.app.tutoraspire.helloworld    import android.support.v7.app.AppCompatActivity  import android.os.Bundle    class MainActivity : AppCompatActivity() {        override fun onCreate(savedInstanceState: Bundle?) {          super.onCreate(savedInstanceState)          setContentView(R.layout.activity_main)      }  }  

Now run your app.

Kotlin Hello World App 5

Output:

Kotlin Hello World App 6

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Kotlin Hello World App

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