如何在android＆xamarin android中的源和目的地的Google地图上显示所有可能的路线？

Question

我正在xamarin android中工作，并试图显示2个地理位置的Google地图（如google map android）上所有可能的路线，我可以使用google direction api显示单个路线，因此任何人都可以帮助我解决这个问题。

Answer 1

Try setting alternative to true. According to the document :

alternatives — If set to true , specifies that the Directions service may provide more than one route alternative in the response. Note that providing route alternatives may increase the response time from the server.

Here is the sample code for handling the response :

protected void onPostExecute(List<List<HashMap<String, String>>> result) {
  ArrayList<LatLng> points = null;
  PolylineOptions lineOptions = null;
  MarkerOptions markerOptions = new MarkerOptions();
  String distance = "";
  String duration = "";

  if(result.size()<1){
      Toast.makeText(getBaseContext(), "No Points", Toast.LENGTH_SHORT).show();
      return;
  }

  // Traversing through all the routes
  for(int i=0;i<result.size();i++){
      points = new ArrayList<LatLng>();
      lineOptions = new PolylineOptions();

      // Fetching i-th route
      List<HashMap<String, String>> path = result.get(i);

      // Fetching all the points in i-th route
      for(int j=0;j<path.size();j++){
          HashMap<String,String> point = path.get(j);

         if(j==0){    // Get distance from the list
              distance = (String)point.get("distance");
              continue;
          }else if(j==1){ // Get duration from the list
              duration = (String)point.get("duration");
              continue;
          }

          double lat = Double.parseDouble(point.get("lat"));
          double lng = Double.parseDouble(point.get("lng"));
          LatLng position = new LatLng(lat, lng);

          points.add(position);
      }

      // Adding all the points in the route to LineOptions
      lineOptions.addAll(points);
      lineOptions.width(4);
      lineOptions.color(Color.CYAN);


  tvDistanceDuration.setText("Distance:"+distance + ", Duration:"+duration);

  // Drawing polyline in the Google Map for the i-th route
  map.addPolyline(lineOptions);
    }
  }
}

Hope this helps.