How to Schedule Notification in Android?

This example demonstrate about How to schedule notification 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 = "http://schemas.android.com/apk/res/android"
   xmlns: tools = "http://schemas.android.com/tools"
   android :layout_width = "match_parent"
   android :layout_height = "match_parent"
   android :padding = "16dp"
   tools :context = ".MainActivity" />
Step 3 − Add the following code to res/menu/main_menu.xml.
<? xml version = "1.0" encoding = "utf-8" ?>
<menu xmlns: android = "http://schemas.android.com/apk/res/android"
   xmlns: app = "http://schemas.android.com/apk/res-auto" >
   <item
      android :id = "@+id/action_5"
      app :showAsAction = "never"
      android :title = "5 seconds" />
   <item
      android :id = "@+id/action_10"
      app :showAsAction = "never"
      android :title = "10 seconds" />
   <item
      android :id = "@+id/action_30"
      app :showAsAction = "never"
      android :title = "30 seconds" />
</menu>
Step 4 − Add the following code to src/MainActivity.
package app.tutorialspoint.com.notifyme ;
import android.app.AlarmManager ;
import android.app.Notification ;
import android.app.NotificationManager ;
import android.app.PendingIntent ;
import android.content.Context ;
import android.content.Intent ;
import android.os.Bundle ;
import android.os.SystemClock ;
import android.support.v4.app.NotificationCompat ;
import android.support.v7.app.AppCompatActivity ;
import android.view.Menu ;
import android.view.MenuItem ;
public class MainActivity extends AppCompatActivity {
   public static final String NOTIFICATION_CHANNEL_ID = "10001" ;
   private final static String default_notification_channel_id = "default" ;
   @Override
   protected void onCreate (Bundle savedInstanceState) {
      super .onCreate(savedInstanceState) ;
      setContentView(R.layout. activity_main ) ;
   }
   @Override
   public boolean onCreateOptionsMenu (Menu menu) {
      // Inflate the menu; this adds items to the action bar if it is present.
      getMenuInflater().inflate(R.menu. menu_main , menu) ;
      return true;
   }
   @Override
   public boolean onOptionsItemSelected (MenuItem item) {
      switch (item.getItemId()) {
         case R.id. action_5 :
            scheduleNotification(getNotification( "5 second delay" ) , 5000 ) ;
            return true;
         case R.id. action_10 :
            scheduleNotification(getNotification( "10 second delay" ) , 10000 ) ;
            return true;
         case R.id. action_30 :
            scheduleNotification(getNotification( "30 second delay" ) , 30000 ) ;
            return true;
         default :
            return super .onOptionsItemSelected(item) ;
      }
   }
   private void scheduleNotification (Notification notification , int delay) {
      Intent notificationIntent = new Intent( this, MyNotificationPublisher. class ) ;
      notificationIntent.putExtra(MyNotificationPublisher. NOTIFICATION_ID , 1 ) ;
      notificationIntent.putExtra(MyNotificationPublisher. NOTIFICATION , notification) ;
      PendingIntent pendingIntent = PendingIntent. getBroadcast ( this, 0 , notificationIntent , PendingIntent. FLAG_UPDATE_CURRENT ) ;
      long futureInMillis = SystemClock. elapsedRealtime () + delay ;
      AlarmManager alarmManager = (AlarmManager) getSystemService(Context. ALARM_SERVICE ) ;
      assert alarmManager != null;
      alarmManager.set(AlarmManager. ELAPSED_REALTIME_WAKEUP , futureInMillis , pendingIntent) ;
   }
   private Notification getNotification (String content) {
      NotificationCompat.Builder builder = new NotificationCompat.Builder( this,
      default_notification_channel_id ) ;
      builder.setContentTitle( "Scheduled Notification" ) ;
      builder.setContentText(content) ;
      builder.setSmallIcon(R.drawable. ic_launcher_foreground ) ;
      builder.setAutoCancel( true ) ;
      builder.setChannelId( NOTIFICATION_CHANNEL_ID ) ;
      return builder.build() ;
   }
}
Step 5 − Add the following code to src/MyNotificationPublisher.
package app.tutorialspoint.com.notifyme ;
import android.app.Notification ;
import android.app.NotificationChannel ;
import android.app.NotificationManager ;
import android.content.BroadcastReceiver ;
import android.content.Context ;
import android.content.Intent ;
import static app.tutorialspoint.com.notifyme.MainActivity. NOTIFICATION_CHANNEL_ID ;
public class MyNotificationPublisher extends BroadcastReceiver {
   public static String NOTIFICATION_ID = "notification-id" ;
   public static String NOTIFICATION = "notification" ;
   public void onReceive (Context context , Intent intent) {
      NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context. NOTIFICATION_SERVICE ) ;
      Notification notification = intent.getParcelableExtra( NOTIFICATION ) ;
      if (android.os.Build.VERSION. SDK_INT >= android.os.Build.VERSION_CODES. O ) {
         int importance = NotificationManager. IMPORTANCE_HIGH ;
         NotificationChannel notificationChannel = new NotificationChannel( NOTIFICATION_CHANNEL_ID , "NOTIFICATION_CHANNEL_NAME" , importance) ;
         assert notificationManager != null;
         notificationManager.createNotificationChannel(notificationChannel) ;
      }
      int id = intent.getIntExtra( NOTIFICATION_ID , 0 ) ;
      assert notificationManager != null;
      notificationManager.notify(id , notification) ;
   }
}
Step 6 − Add the following code to AndroidManifest.xml
<? xml version = "1.0" encoding = "utf-8" ?>
<manifest xmlns: android = "http://schemas.android.com/apk/res/android"
   package = "app.tutorialspoint.com.notifyme" >
   <uses-permission android :name = "android.permission.VIBRATE" />
   <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>
      <receiver android :name = ".MyNotificationPublisher" />
   </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 −
Click  here  to download the project code