CareerCup

I would start by designing this from a top level restfully backed mobile client application.
We would want to break the feature into a common design pattern. This would include Models for the Posts and User. A Network class to manage getting the data for the posts from the facebook API. A Controller (Activity) to NewsfeedActivity. This controller would use the models and views to produce the UI for the newsfeed list view. The Model would interface with the Network Class to get the data and convert it to formats the controller requires. And finally, views for the newsfeed post items, and the list container.

After laying out the general design I would go into implementation details about how the Activity would manage this UI using most likely an ArrayList list adapter.

This is a bare minimum logic:

There are users.
User has a list of Posts.
User has a list of friends.
There is a news feed for each user.
News feed has a list of Posts collected from your friends list Using Observer pattern.

Barry, Did you interview in Palo Alto or Seattle?

barry...can u share ur answer too

Use MVC where

public class Controller { //User updates will make a call to this class
statusUpdate(String userId, Status status); //makes call to model
postPhoto(String userId, Photo photo);
}

public class Model { //Does db updates and notifies view
statusUpdate(String userId, Status status); //Updates status in DB, finds user and his friends, notifies friends views with new status
postPhoto(String userId, Photo photo);
}

public class View {
String userId;
Wall wall;
updateWall(User user, Status status);
updateWall(User user, Photo photo);

}

Create a NewsFeed Activity that uses a List Adapter to populate a ListView with data from a Cursor returned by a request to a Content Provider.