There is probably a mix with the map libraries here.
Mapsforge <https://github.com/mapsforge/mapsforge> is an offline vector
map library and Osmdroid <https://github.com/osmdroid/osmdroid> (and its
fork MapBox <https://github.com/mapbox/mapbox-android-sdk>) are raster
map libraries.
GraphHopper can work of course with all of them, as it calculates a
route and we can use each library's overlay mechanism to visualize it.
I suggest to first try using Android Sample as is and then to study its
MainActivity
<https://github.com/graphhopper/graphhopper/blob/master/android/app/src/main/java/com/graphhopper/android/MainActivity.java>
class in order to understand how you can work it.
--
Emux
Cruiser <http://wiki.openstreetmap.org/wiki/Cruiser> - Atlas
<http://wiki.openstreetmap.org/wiki/Atlas_%28navigation_application%29>
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