int source = AltosDroidPreferences.map_source();
int new_source = source == AltosDroidPreferences.MAP_SOURCE_ONLINE ? AltosDroidPreferences.MAP_SOURCE_OFFLINE : AltosDroidPreferences.MAP_SOURCE_ONLINE;
AltosDroidPreferences.set_map_source(new_source);
int source = AltosDroidPreferences.map_source();
int new_source = source == AltosDroidPreferences.MAP_SOURCE_ONLINE ? AltosDroidPreferences.MAP_SOURCE_OFFLINE : AltosDroidPreferences.MAP_SOURCE_ONLINE;
AltosDroidPreferences.set_map_source(new_source);