How to write date and time changer Listener in Android?

This example demonstrates how do I write date and time changer Listener in android.

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="https://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="match_parent">
   <DatePicker
      android:id="@+id/datePicker"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerHorizontal="true"/>
   <Button
      android:id="@+id/btnTime"
      android:layout_below="@id/datePicker"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Click here to view Time Picker"
      android:textStyle="bold"
      android:layout_centerInParent="true"
      android:layout_marginTop="36dp"/>
</RelativeLayout>

Step 3 − Add the following code to src/MainActivity.java

import android.annotation.TargetApi;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
   Button btnTime;
   @TargetApi(Build.VERSION_CODES.O)
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      btnTime = findViewById(R.id.btnTime);
      DatePicker datePicker = findViewById(R.id.datePicker);
      datePicker.setOnDateChangedListener(new DatePicker.OnDateChangedListener() {
         @Override
         public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
         Toast.makeText(MainActivity.this," You are changed date is : "+dayOfMonth +" - "+monthOfYear+ " - "+year,Toast.LENGTH_LONG).show();
      }
   });
   btnTime.setOnClickListener(new View.OnClickListener(){
      @Override
      public void onClick(View v) {
         Intent intent = new Intent(MainActivity.this, TimePicker.class);
         startActivity(intent);
      }
   });
   }
}

Step 4 − Create a new Activity and add the following code activity_time_picker.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
   xmlns:android="https://schemas.android.com/apk/res/android"
   xmlns:tools="https://schemas.android.com/tools"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   tools:context=".TimePicker">
   <TimePicker
      android:id="@+id/timePicker"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true"/>
</RelativeLayout>

Step 5 − Add the following code in res/TimePicker.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;
public class TimePicker extends AppCompatActivity {
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_time_picker);
      android.widget.TimePicker timePicker = findViewById(R.id.timePicker);
      timePicker.setOnTimeChangedListener(new android.widget.TimePicker.OnTimeChangedListener() {
         @Override
         public void onTimeChanged(android.widget.TimePicker view, int hourOfDay, int minute) {
            Toast.makeText(TimePicker.this, "Your changed time is: " +hourOfDay+ " - "+minute, Toast.LENGTH_SHORT).show();
         }
      });
   }
}

Step 6 − Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="https://schemas.android.com/apk/res/android" package="app.com.sample">
   <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=".TimePicker"></activity>
      <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 Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −