How to Get Context.NOTIFICATION_SERVICE

public static final String NOTIFICATION_SERVICE was added in API level 1
Use with getSystemService(String) to retrieve a NotificationManager for informing the user of background events.

1. In the MainActivity.java file, add the below line to the imports section.

 import android.content.Context;

2. In the onCreate method, add the line below. This will save NotificationService to a string named svcName

String svcName = Context.NOTIFICATION_SERVICE;

3. Compile and run! 

Next Recommended Article: How to Declare a NotificationManager

Resources:
http://developer.android.com/reference/android/content/Context.html#NOTIFICATION_SERVICE