Google路线API（Transit模式）每个请求只返回一个替代路线 [英] Google Directions API (Transit mode) returns only one alternative route per request

问题描述

我已经建立了一个小应用程序，它在传输模式下调用Google Directions API。它的工作原理 - 尽管如此它只返回一条可能的路线，因此它不会显示其他选项。通常我预计有3-4个选项可供选择。

示例：
http://maps.googleapis.com/maps/api / directions / json？origin = bieberstrasse，+ dusseldorf& destination = norf，+ neuss& sensor = false& mode = transit& departure_time = 1399399424

返回的JSON结构具有期望的路由数组，但此数组始终只有一个元素。我已经在巴西和德国的地址上试过了 - 这个国家没有关系，我只有一条路线。

我错过了一些参数吗？有人可以帮我吗？

解决方案

如果您需要其他路线，请指定请求参数 alternatives = true ：

< p> a中转&安培; DEPARTURE_TIME = 1399399424\" > http://maps.googleapis.com/maps/api/directions/json?alternatives=true&origin=bieberstrasse,+dusseldorf&destination=norf,+neuss&sensor=false&mode=transit& ; departure_time = 1399399424

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?

解决方案

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

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