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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.
Step | Description |
---|---|
1. | Open Android Studio. |
2. | Go to File => New => New Project. Write application name as DynamicDatePicker. Then, check Include Kotlin Support and click next button. |
3. | Select minimum SDK you need. However, we have selected 17 as minimum SDK. Then, click next button |
4. | Then, select Empty Activity => click next => click finish. |
5. | At this point, You will get a newly created android project successfully. |
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.