well.... 2. is just geometry and math. Assuming that your http requests results in some kml that includes a polyline then personally I would build an array containing each line and then just work out the closest distance to each one from my current location every x seconds or y feet travelled.
If you are further than a certain distance (which you have to decide) from ALL of the lines then you know that the user has taken a detour and you should simply resubmit a new routing request starting at your current location and ending at the original location. unless your kml has hundreds of polylines I'm not sure I'd even bother optimize the algorithm - just brute force it. I would be a little careful of what your app does though: you might want to read the Maps TOS license restrictions carefully to make sure you stay within them. On Nov 29, 9:49 pm, James Black <[email protected]> wrote: > Hello, > I am working on a navigation program and I have two things that could > make my program better. > > 1. How can I find alternate routes. > > I use this url > currently:http://maps.google.com/maps?f=d&hl=en&saddr=xxx,zzz&daddr=yyy,www&ie=... > > 2. How can I tell when the user takes a detour from the path on the > MathOverlay, so I can get a new route for them? > > Thank you. > > -- > "I know that you believe you understand what you think I said, but I'm not > sure you realize that what you heard is not what I meant." > - Robert McCloske -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
