Android version of pMetro (http://pmetro.su). You can load ~200 metro maps of pMetro project from http://pmetro.su/Maps.html
Application builds the shortest route and calculates trip time using subway and other city transports. There is additional information on stations and 2D schemas (double tap to view).
Google Play: https://play.google.com/store/apps/details?id=com.utyf.pmetro
4PDA forum: http://4pda.ru/forum/index.php?showtopic=654059