I\'m currently developing an application that will launch a navigation intent. I know that this isn\'t an official API, but it works perfectly the way I want it to.
After a bunch of guessing and hunting around, I have decided that it is impossible to launch directly to bus navigation, because that would involve CHOOSING a bus for the person to ride, which wouldn't make sense.
Instead, you can launch them to a Google Maps search to the destination like so, thank you to this answer to a similar question:
"http://maps.google.com/maps?daddr=lat,long&dirflg=r"
With the &dirflag
specifying public transit. (Why the "r" I have no idea...)