One of Google's most popular services—after search, of course—is Google Maps, which lets you find everything from the nearest pizza parlor to directions from New York City to San Francisco (only 2,905 miles!), along with supplying street views and satellite imagery.
Most Android devices, not surprisingly, integrate Google Maps. For those that do, there is a mapping activity available to users directly from the main Android launcher. More relevant to you, as a developer, are
MapActivity, which allow you to integrate maps into your own applications. Not only can you display maps, control the zoom level, and allow people to pan around, but you can tie in Android's location-based services ...