问题
I have built an small application which calls the Google Directions API in Transit mode. It works - nevertheless it returns only one possible route, so it shows no alternatives. Usually I expect 3-4 options to choose from.
Example: http://maps.googleapis.com/maps/api/directions/json?origin=bieberstrasse,+dusseldorf&destination=norf,+neuss&sensor=false&mode=transit&departure_time=1399399424
The returned JSON structure has the expected "routes" array, but this array always has only one element. I have tried it with addresses in Brazil and Germany - it doesn't matter the country, I only get one single route.
Did I miss some parameter? Could someone help me with it?
回答1:
If you want alternative routes, specify the request parameter alternatives=true:
http://maps.googleapis.com/maps/api/directions/json?alternatives=true&origin=bieberstrasse,+dusseldorf&destination=norf,+neuss&sensor=false&mode=transit&departure_time=1399399424
来源：https://stackoverflow.com/questions/23502060/google-directions-api-transit-mode-returns-only-one-alternative-route-per-requ