Hello Readers! In this post, we are going to learn about how to use android calendarView programmatically in kotlin in the application. We will also learn how to add calendarView to linearLayout programmatically in android application.

Output

Tutorialwing Android Kotlin Dynamic CalendarView Output

Getting Started

At first, we will create android project. Then, we will create and use calendarView programmatically in kotlin file.

1. Creating New Project in Kotlin

Follow the steps below to create new project. Please ignore the steps if you have already created a new project.

Now, we will modify xml and kotlin file to use calendarView dynamically.

2. Modify Values Folder

No values folder have been modified. So, we are not going to mention them here.

3. Modify Layout Folder

Open res/layout/activity_main.xml file. Then, add below code into it.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
	android:id="@+id/rootContainer"
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:gravity="center"
	android:orientation="vertical">

</LinearLayout>

In activity_main.xml file, we have defined a linearLayout, with id rootContainer, that will act as container for the calendarView widget created programmatically in kotlin file.

4. Create Android CalendarView Programmatically / Dynamically in Kotlin

Open app/src/main/java/com.tutorialwing.dynamiccalendarview/MainActivity.kt file. Then, add below code into it.

package com.tutorialwing.dynamiccalendarview

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.ViewGroup
import android.widget.CalendarView
import android.widget.LinearLayout
import android.widget.Toast

class MainActivity : AppCompatActivity() {

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

        val calendarView = CalendarView(this)
        val layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)
        layoutParams.setMargins(90, 40, 80, 40)
        calendarView.layoutParams = layoutParams

        calendarView.setOnDateChangeListener { view, year, month, dayOfMonth ->
            //Note that months are indexed from 0. So, 0 means january, 1 means February, 2 means march etc.
            val msg = "Selected date is " + dayOfMonth + "/" + (month + 1) + "/" + year
            Toast.makeText(this@MainActivity, msg, Toast.LENGTH_SHORT).show()
        }

        val linearLayout = findViewById<LinearLayout>(R.id.rootContainer)
        linearLayout?.addView(calendarView)
    }
}

We have created CalendarView programmatically in kotlin file (i.e. MainActivity.kt file) in the application. After that, we have set layout params, margins etc. in it. After that, we have set date change listener in calendarView that display selected date as toast message whenever there is any change in date selection in the calendarView. At last, we have added this calendarView widget in linearLayout having id rootContainer.

Since AndroidManifest.xml file is very important in any android application, we are also going to see the content inside this file.

AndroidManifest.xml file

Code inside src/main/AndroidManifest.xml file is –

<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.tutorialwing.dynamiccalendarview"
		  xmlns:android="http://schemas.android.com/apk/res/android">

	<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>

When we run the program, we will get output as shown above.

That’s end of our tutorial on Creating Android CalendarView Programmatically in Kotlin.