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

Output

Tutorialwing Kotlin Dynamic DatePicker Output

Getting Started

At first, we will create android project. Then, we will create and use datePicker 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 datePicker 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
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:layout_margin="10dp"
	android:gravity="center"
	android:orientation="vertical">

	<LinearLayout
		android:id="@+id/rootContainer"
		android:layout_width="match_parent"
		android:layout_height="wrap_content"
		android:orientation="vertical">

	</LinearLayout>

	<TextView
		android:id="@+id/textView"
		android:layout_width="match_parent"
		android:layout_height="wrap_content"
		android:layout_marginTop="3dp"/>

</LinearLayout>

In activity_main.xml file, we have defined textView and linearLayout, with id rootContainer, that will act as container for the datePicker created programmatically in the application.

4. Create Android DatePicker Programmatically / Dynamically in Kotlin

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

package com.tutorialwing.dynamicdatepicker

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.ViewGroup
import android.widget.DatePicker
import android.widget.LinearLayout
import android.widget.TextView
import android.widget.Toast
import java.util.*

class MainActivity : AppCompatActivity() {

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

        val textView = findViewById<TextView>(R.id.textView)

        val datePicker = DatePicker(this)
        val layoutParams = LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)
        layoutParams.setMargins(10, 10, 10, 10)
        datePicker.layoutParams = layoutParams

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

        val today = Calendar.getInstance()
        datePicker.init(today.get(Calendar.YEAR), today.get(Calendar.MONTH), today.get(Calendar.DAY_OF_MONTH)

        ) { view, year, monthOfYear, dayOfMonth ->
            val month = monthOfYear + 1
            val msg = "Selected Date is $dayOfMonth/$month/$year"
            Toast.makeText(this@MainActivity, msg, Toast.LENGTH_SHORT).show()

            if (textView != null) {
                textView.text = msg
            }
        }
    }
}

We have defined datePicker programmatically in kotlin file (i.e. in MainActivity.java file) in the application. Then, we have set layout params and margin in it. Then, we have added this datePicker widget in the linearLayout. After that, we have set listener in datePicker to set the selected date as text in the textView.

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.dynamicdatepicker"
		  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 DatePicker Programmatically in Kotlin.