GraphHopper itself is a Java routing library.
A navigation via text or voice (I presume in Android) is an additional
component of the actual navigator app (where GH plays a specific role).
So in the app you can implement a text-to-speech for the retrieved
instructions or even use pre-recorded words.
--
Emux
Cruiser <http://wiki.openstreetmap.org/wiki/Cruiser> - Atlas
<http://wiki.openstreetmap.org/wiki/Atlas_%28navigation_application%29>
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