The NY MTA, operator of New York City's subways, buses, and commuter trains, has announced a new "app". MTA customers who use Android devices can now get detailed information about the subway service changes planned for the upcoming weekend. (Heavy maintenance resulting in route detours is performed over weekends).
Due to the large amount of data and mapping involved in the mobile version of The Weekender - 100 Megabytes - MTA developers have smartly "packeted" the data, so the initial download includes the basic functions needed to get started. Then, each time the user plans a trip or taps to view a particular neighborhood map, only those images are added to the app, so the app gets smarter with every use without hogging device memory.
For full announcement please see: