谷歌地圖顯示錯誤和不完整的方向

Question

有時getFromlocationName（）方法返回null，有時它會給出值，但繪製的路徑不正確。這可能是什麼原因？好心解決問題，謝謝。

下面是代碼

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

它beacase我正在錯誤的座標：

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

正確的代碼是：

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

但getfromlocationName得到空值（ ）的地理編碼器爲什麼？