折线未遵循两个位置之间的实际路径答案

【问题标题】：Polyline is not following the actual path betweeen two locations折线未遵循两个位置之间的实际路径
【发布时间】：2018-01-31 06:48:46
【问题描述】：

我从 Google Directions API 获取纬度和经度，并使用它们显示两个位置之间的折线。正在绘制折线，但未遵循它必须遵循的确切道路或路径。

这是我的截图-

Screenshot 1

Screenshot 2

这是我获取 LatLngs 并显示折线的代码。

 public void requestDirections(final String mode, String origin, String destination)
{
    final ProgressDialog progress=new ProgressDialog(this);
    progress.setMessage("Finding route");
    progress.show();


    Retrofit retrofit= new Retrofit.Builder().baseUrl("https://maps.googleapis.com/").addConverterFactory(GsonConverterFactory.create()).build();
    Call<DirectionResponse> call=retrofit.create(ApiDirections.class).getDirections(mode, origin, destination);
    call.enqueue(new Callback<DirectionResponse>() {
        @Override
        public void onResponse(Call<DirectionResponse> call, Response<DirectionResponse> response) {


            for(int i=0; i<response.body().getRoutes().get(0).getLegs().get(0).getSteps().size(); i++)
            {
                LatLng startLoc=new LatLng(response.body().getRoutes().get(0).getLegs().get(0).getSteps().get(i).getStartLocation().getLat(), response.body().getRoutes().get(0).getLegs().get(0).getSteps().get(i).getStartLocation().getLng());
                LatLng endLoc=new LatLng(response.body().getRoutes().get(0).getLegs().get(0).getSteps().get(i).getEndLocation().getLat(), response.body().getRoutes().get(0).getLegs().get(0).getSteps().get(i).getEndLocation().getLng());

                Polyline polyline=response.body().getRoutes().get(0).getLegs().get(0).getSteps().get(i).getPolyline();

                DataHandler.startingLocations.add(startLoc);
                DataHandler.endingLocations.add(endLoc);
                System.out.println("Starting Loc "+i+" "+startLoc);
                System.out.println("Ending Loc "+i+" "+endLoc);
                System.out.println("polyline "+i+" "+polyline.getPoints());


            }
            LatLng endLocation=new LatLng(response.body().getRoutes().get(0).getLegs().get(0).getEndLocation().getLat(), response.body().getRoutes().get(0).getLegs().get(0).getEndLocation().getLng());
            marker=mMap.addMarker(new MarkerOptions().position(endLocation).flat(true));

            marker.setTag(destinationName);
            mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(DataHandler.startingLocations.get((response.body().getRoutes().get(0).getLegs().get(0).getSteps().size())/2), 10));
            polylineOptions=new PolylineOptions();
            polylineOptions.addAll(DataHandler.endingLocations);
            polylineOptions.color(getResources().getColor(R.color.colorAccent));
            polylineOptions.width(12);
            polylineOptions.startCap(new RoundCap());
            polylineOptions.endCap(new RoundCap());



            mMap.addPolyline(polylineOptions);
            textViewJourneyDistance.setText(response.body().getRoutes().get(0).getLegs().get(0).getDistance().getText());
            textViewJourneyTime.setText(response.body().getRoutes().get(0).getLegs().get(0).getDuration().getText());



            progress.dismiss();

        }

        @Override
        public void onFailure(Call<DirectionResponse> call, Throwable t) {

            progress.dismiss();
        }
    });
}
 public interface ApiDirections{

    @GET("maps/api/directions/json?key=My_API_KEY")
    Call<DirectionResponse> getDirections(@Query("mode") String mode,
                                          @Query("origin") String origin,
                                          @Query("destination") String destination);
}

【问题讨论】：

标签： android google-maps android-studio polyline

【解决方案1】：

你需要得到routelist

 ArrayList<LatLng> routelist = new ArrayList<LatLng>();
                        if (response.body().getRoutes().size() > 0) {
                            ArrayList<LatLng> decodelist;
                            Route routeA = response.body().getRoutes().get(0);
                            Log.e("ad", "Legs length : " + routeA.getLegs().size());
                            if (routeA.getLegs().size() > 0) {
                                List<Steps> steps = routeA.getLegs().get(0).getSteps();
                                Log.e("ad", "Steps size :" + steps.size());
                                Steps step;
                                Location location;
                                String polyline;
                                for (int i = 0; i < steps.size(); i++) {
                                    step = steps.get(i);
                                    location = step.getStart_location();
                                    routelist.add(new LatLng(location.getLat(), location.getLng()));
                                    Log.e("ad", "Start Location :" + location.getLat() + ", " + location.getLng());
                                    polyline = step.getPolyline().getPoints();
                                    decodelist = RouteDecode.decodePoly(polyline);
                                    routelist.addAll(decodelist);
                                    location = step.getEnd_location();
                                    routelist.add(new LatLng(location.getLat(), location.getLng()));
                                    Log.e("ad", "End Location :" + location.getLat() + ", " + location.getLng());


                                    Integer disInMeters = routeA.getLegs().get(0).getDistance().getValue();
                                    int kilometers = (int) (disInMeters * 0.001);


                                }
                            }
                        }

                        if (routelist.size() > 0) {


                            PolylineOptions rectLine = new PolylineOptions().width(10).color(ContextCompat.getColor(SendSomethingTodayActivityThree.this, R.color.colorPrimary));

                            for (int i = 0; i < routelist.size(); i++) {
                                rectLine.add(routelist.get(i));
                            }}

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【讨论】：