CarExtender

Helper class to add Android Auto extensions to notifications. To create a notification with car extensions:

1. Create an NotificationCompat.Builder, setting any desired properties.
2. Create a CarExtender.
3. Set car-specific properties using the add and set methods of CarExtender.
4. Call extend to apply the extensions to a notification.
5. Post the notification to the notification system with the NotificationManagerCompat.notify(...) methods and not the NotificationManager.notify(...) methods.

Notification notification = new NotificationCompat.Builder(context)
        ...
        .extend(new CarExtender()
                .set*(...))
        .build();

Car extensions can be accessed on an existing notification by using the CarExtender(Notification) constructor, and then using the get methods to access values.