How to retrieve Android API version programmatically using Kotlin?

This example demonstrates how to retrieve Android API version programmatically using Kotlin.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
   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:layout_centerHorizontal="true"
      android:layout_marginTop="50dp"
      android:text="Tutorials Point"
      android:textAlignment="center"
      android:textColor="@android:color/holo_green_dark"
      android:textSize="32sp"
      android:textStyle="bold" />
   <TextView
      android:id="@+id/textView"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_above="@id/button"
      android:layout_centerInParent="true"
      android:layout_marginBottom="12sp"
      android:text=""
      android:textSize="24sp"
      android:textStyle="bold|italic" />
   <Button
      android:id="@+id/button"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true"
      android:text="Get Android API Version"
      android:textSize="16sp"
      android:textStyle="bold" />
</RelativeLayout>

Step 3 − Add the following code to src/MainActivity.kt

import android.os.Build
import android.os.Bundle
import android.widget.Button
import android.widget.TextView
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
class MainActivity : AppCompatActivity() {
   lateinit var button: Button
   lateinit var textView: TextView
   var androidVersion = 0
   override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
      setContentView(R.layout.activity_main)
      title = "KotlinApp"
      textView = findViewById(R.id.textView)
      button = findViewById(R.id.button)
      button.setOnClickListener {
         androidVersion = Build.VERSION.SDK_INT
         when (androidVersion) {
            14 −> textView.text = "15, Ice Cream Sandwich"
            15 −> textView.text = "15, Ice Cream Sandwich"
            16 −> textView.text = "16, Jelly Bean"
            17 −> textView.text = "17, Jelly Bean"
            18 −> textView.text = "18, Jelly Bean"
            19 −> textView.text = "19, KitKat"
            21 −> textView.text = "21, Lollipop"
            22 −> textView.text = "22, Lollipop"
            23 −> textView.text = "23, Marshmallow"
            24 −> textView.text = "24, Nougat"
            25 −> textView.text = "25, Nougat"
            26 −> textView.text = "26, Oreo"
            27 −> textView.text = "27, Oreo"
            28 −> textView.text = "28, Pie"
            29 −> textView.text = "29, Android Q"
            else −> Toast.makeText(this@MainActivity, "Not Found", Toast.LENGTH_LONG).show()
         }
      }
   }
}

Step 4 − Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.q11">
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
      <activity android:name=".MainActivity">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen