How to add calendar events in Android App using Kotlin?

This example demonstrates how to add calendar events in Android App 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"
   android:padding="8dp"
   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" />
   <Button
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_below="@+id/textView"
      android:layout_centerInParent="true"
      android:onClick="addCalendarEvent"
      android:text="Add Calendar Event" />
   <TextView
      android:id="@+id/textView"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true"
      android:text="Calendar Event In Android"
      android:textColor="@android:color/background_dark"
      android:textSize="18sp"
      android:textStyle="bold" />
</RelativeLayout>
Step 3 − Add the following code to src/MainActivity.kt
import android.content.Intent
import android.os.Bundle
import android.view.View
import androidx.appcompat.app.AppCompatActivity
import java.util.*
class MainActivity : AppCompatActivity() {
   override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
      setContentView(R.layout.activity_main)
      title = "KotlinApp"
   }
   fun addCalendarEvent(view: View) {
      val calendarEvent: Calendar = Calendar.getInstance()
      val intent = Intent(Intent.ACTION_EDIT)
      intent.type = "vnd.android.cursor.item/event"
      intent.putExtra("beginTime", calendarEvent.timeInMillis)
      intent.putExtra("allDay", true)
      import android.content.Intent
      import android.os.Bundle
      import android.view.View
      import androidx.appcompat.app.AppCompatActivity
      import java.util.*
      class MainActivity : AppCompatActivity() {
         override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
         title = "KotlinApp"
      }
      fun addCalendarEvent(view: View) {
         val calendarEvent: Calendar = Calendar.getInstance()
         val intent = Intent(Intent.ACTION_EDIT)
         intent.type = "vnd.android.cursor.item/event"
         intent.putExtra("beginTime", calendarEvent.timeInMillis)
         intent.putExtra("allDay", true)
         intent.putExtra("rule", "FREQ=YEARLY")
         intent.putExtra("endTime", calendarEvent.timeInMillis + 60 * 60 * 1000)
         intent.putExtra("title", "Calendar Event")
         startActivity(intent)
   }
}
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="app.com.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