This SiteWhere Android Sample Code demonstrates user interface operations. The snippet shows an alert dialog with title and message, and another alert by implementing strings for the title and message.
When it comes to map mashups there's no doubt that Google Maps leads the way. On ProgrammableWeb we list 1,964 Google Maps mashups, almost four times as many as any other API. This popularity makes utilities built on top of Google Maps especially interesting, such as this contextual menu control, which pops up a menu when the user right clicks.