Question

有时getFromlocationName（）方法返回null，有时它会给出值，但绘制的路径不正确。这可能是什么原因？善意解决问题，谢谢。

下面是代码

 if((place1 != null) || (!place1.equals(" "))&& ((place2!=null)||(!place2.equals(" "))))
                {

                    Geocoder geocoder = new Geocoder(MapsActivity.this);
                    try {
                               Boolean check=geocoder.isPresent();
                        Log.d("check:"," "+check);
                               addressList1 = geocoder.getFromLocationName(place1, 1);
                               addressList2 = geocoder.getFromLocationName(place2, 1);

                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    Log.d("ADDRESS","address obj:"+addressList1+","+addressList2);
                    Address address1 = addressList1.get(0);
                    Address address2 = addressList2.get(0);
                    origin = new LatLng(address1.getLatitude(),address1.getLongitude());
                    destination = new LatLng(address1.getLatitude(),address2.getLongitude());
                    Log.d("LATLANG","LatLang:"+origin+","+destination);
      build_retrofit_and_get_response(mode);

                }
            }


     public void build_retrofit_and_get_response(String type) {
          Toast.makeText(this,"retrofit method called"+origin+destination,Toast.LENGTH_LONG).show();
            String url = "https://maps.googleapis.com/maps/";

            Retrofit retrofit = new Retrofit.Builder()
                    .baseUrl(url)
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();

            RetrofitMaps service = retrofit.create(RetrofitMaps.class);

            Call<Example> call = service.getDistanceDuration("metric", origin.latitude + "," + origin.longitude,destination.latitude + "," + destination.longitude, type);

            call.enqueue(new Callback<Example>() {
                @Override
                public void onResponse(Response<Example> response, Retrofit retrofit) {

                    try {
                        //Remove previous line from map
                        if (line != null) {
                            line.remove();
                        }
                        // This loop will go through all the results and add marker on each location.
                        for (int i = 0; i < response.body().getRoutes().size(); i++) {
                            String distance = response.body().getRoutes().get(i).getLegs().get(i).getDistance().getText();
                            String time = response.body().getRoutes().get(i).getLegs().get(i).getDuration().getText();
                            ShowDistanceDuration.setText("Distance:" + distance + ", Duration:" + time);
                            String encodedString = response.body().getRoutes().get(0).getOverviewPolyline().getPoints();
                            List<LatLng> list = decodePoly(encodedString);
                            line = mMap.addPolyline(new PolylineOptions()
                                    .addAll(list)
                                    .width(10)
                                    .color(Color.RED)
                                    .geodesic(true)
                            );
                        }
                    } catch (Exception e) {
                        Log.d("onResponse", "There is an error");
                        e.printStackTrace();
                    }
                }

                @Override
                public void onFailure(Throwable t) {
                    Log.d("onFailure", t.toString());
                }
            });

        }

        private List<LatLng> decodePoly(String encoded) {
            List<LatLng> poly = new ArrayList<LatLng>();
            int index = 0, len = encoded.length();
            int lat = 0, lng = 0;

            while (index < len) {
                int b, shift = 0, result = 0;
                do {
                    b = encoded.charAt(index++) - 63;
                    result |= (b & 0x1f) << shift;
                    shift += 5;
                } while (b >= 0x20);
                int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
                lat += dlat;

                shift = 0;
                result = 0;
                do {
                    b = encoded.charAt(index++) - 63;
                    result |= (b & 0x1f) << shift;
                    shift += 5;
                } while (b >= 0x20);
                int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
                lng += dlng;

                LatLng p = new LatLng( (((double) lat / 1E5)),
                        (((double) lng / 1E5) ));
                poly.add(p);
            }

            return poly;
        }

Answer 1

是的，我正在采取错误的坐标：

  origin = new LatLng(address1.getLatitude(),address1.getLongitude());
  destination = new LatLng(address1.getLatitude(),address2.getLongitude());

正确的代码是：

  origin = new LatLng(address1.getLatitude(),address1.getLongitude());
  destination = new LatLng(address2.getLatitude(),address2.getLongitude());

但是从地理编码器的getfromlocationName（）获取空值为什么？

谷歌地图显示错误和不完整的方向

1 个答案: