Offline Routing And Navigation In Osmdroid, How Can I Get This Feature?

I am developing Android app with OSM which support offline routing and navigation. I want to integrate the offline routing and navigation in OSM for Android app. There are lots of

Solution 1:

You can find a comparison of routing services here: https://github.com/MKergall/osmbonuspack/wiki/WhichRoutingService

But if you want offline routing, GraphHopper will be your only solution.