1. Get a reference to the NotificationManager: 
    String ns = Context.NOTIFICATION_SERVICE;
    
        NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);
  2. Instantiate the Notification: 
    int icon = R.drawable.notification_icon;
    
        CharSequence tickerText = "Hello";
    
        long when = System.currentTimeMillis();
    
    
    
        Notification notification = new Notification(icon, tickerText, when);
  3. Define the Notification's expanded message and Intent: 
    Context context = getApplicationContext();
    
        CharSequence contentTitle = "My notification";
    
        CharSequence contentText = "Hello World!";
    
        Intent notificationIntent = new Intent(this, MyClass.class);
    
        PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);
    
    
    
    notification    .setLatestEventInfo(context, contentTitle, contentText, contentIntent);
  4. Pass the Notification to the NotificationManager: 
    private static final int HELLO_ID = 1;
    
    
    
    mNotificationManager    .notify(HELLO_ID, notification);

    That's it. Your user has now been notified.