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

Output

Tutorialwing Android Dynamic DatePicker Output

Getting Started

At first, we will create an android application. Then, we will use datePicker widget in the application.

1. Creating New Project

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

Now, we will modify xml and java file to use android datePicker programmatically.

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 widget created programmatically in the application.

4. Create Android DatePicker Programmatically / Dynamically

Open app/src/main/java/com.tutorialwing.dynamicdatepicker/MainActivity.java file and 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
            }
        }
    }
}

In MainActivity.java file, we have defined DatePicker widget. Then, we have set layout params and margin in it. After that, we have added this widget into linearLayout having id rootContainer. Then, we have set a listener to show selected date in datePicker as text in textView.

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

AndroidManifest.xml file

Code inside src/main/AndroidManifest.xml file would look like below –

<?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 application, we will get output as shown above.

That’s the end of tutorial on Creating Android DatePicker Programmatically.