json에서 경도와 위도를 가져 와서 Google지도에 마커를 표시하려고합니다

Question

json에서 경도와 위도를 가져 와서 Google지도에서 마커를 표시하고 싶습니다. AsyncTask에서 마커를 사용하면 지정된 latlng에서 마커를 표시하지 않습니다. ... 내가 예를 들어, GitHub의 에 주어진 코드 시도가이 질문에 대한

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback { 

private GoogleMap mMap; 
String city = "New Delhi"; 
String location = null; 
double lat; 
double lng ; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_maps); 
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager() 
      .findFragmentById(R.id.map); 
    mapFragment.getMapAsync(this); 


    new JSONTask().execute("http://www.xxxxxxx.com/bar/mob.php"); 
} 

@Override 
public void onMapReady(GoogleMap googleMap) { 
    mMap = googleMap; 

    // Add a marker in Sydney and move the camera 
    LatLng latLng = new LatLng(-30, 140); 
    mMap.addMarker(new MarkerOptions().position(latLng).title("Marker")); 
    mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng)); 

    // i want use that lat and lng here which i am getting in AsyncTask 
    LatLng latLng1 = new LatLng(lat, lng); 
    mMap.addMarker(new MarkerOptions().position(latLng1).title("Marker")); 
    mMap.setMyLocationEnabled(true); 
} 

private class JSONTask extends AsyncTask<String, String, List<Bardata>> { 

    @Override 
    protected List<Bardata> doInBackground(String... params) { 

     HttpURLConnection connection = null; 
     BufferedReader reader = null; 


     try { 
      URL url = new URL(params[0]); 
      connection = (HttpURLConnection) url.openConnection(); 
      connection.setReadTimeout(10000); 
      connection.setConnectTimeout(15000); 
      connection.setRequestMethod("POST"); 
      connection.setDoInput(true); 
      connection.setDoOutput(true); 

      Uri.Builder builder = new Uri.Builder() 
        .appendQueryParameter("location", location) 
        .appendQueryParameter("city", city); 
      String query = builder.build().getEncodedQuery(); 


      OutputStream os = connection.getOutputStream(); 
      BufferedWriter writer = new BufferedWriter(
        new OutputStreamWriter(os, "UTF-8")); 
      writer.write(query); 
      writer.flush(); 
      writer.close(); 
      os.close(); 
      connection.connect(); 
      InputStream stream = connection.getInputStream(); 

      reader = new BufferedReader(new InputStreamReader(stream)); 

      StringBuffer buffer = new StringBuffer(); 

      String line = ""; 
      while ((line = reader.readLine()) != null) { 
       buffer.append(line); 
      } 
      String finalJson = buffer.toString(); 
      System.out.println("Returned value " + finalJson.toString()); 

      JSONObject parentObject = new JSONObject(finalJson); 
      JSONArray parentArray = parentObject.getJSONArray("home"); 

      List<Bardata> bardataList = new ArrayList<>(); 
      Gson gson = new Gson(); 
      for (int i = 0; i < parentArray.length(); i++) { 


       JSONObject finalObject = parentArray.getJSONObject(i); 
       Bardata barData = gson.fromJson(finalObject.toString(), Bardata.class); 
       bardataList.add(barData); 


       lat = barData.getLatitude(); 
       lng = barData.getLongitude(); 

       /* LatLng latLng1 = new LatLng(lat, lng); 
       mMap.addMarker(new MarkerOptions().position(latLng1).title("Marker")); 
       mMap.setMyLocationEnabled(true);*/ 



      } 
      return bardataList; 


     } catch (MalformedURLException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } catch (JSONException e) { 
      e.printStackTrace(); 
     } 


     return null; 
    } 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 

    } 

    @Override 
    protected void onPostExecute(final List<Bardata> result) { 
     super.onPostExecute(result); 
     if (result != null) { 

     } else { 
      Toast.makeText(getApplicationContext(), "Currently,we are not present in your city", Toast.LENGTH_SHORT).show(); 
     } 

    } 

}} 

bardata.java

public class Bardata { 


private String barname; 
private double longitude; 
private double latitude; 

public double getLongitude() { 
    return longitude; 
} 

public void setLongitude(double longitude) { 
    this.longitude = longitude; 
} 

public double getLatitude() { 
    return latitude; 
} 

public void setLatitude(double latitude) { 
    this.latitude = latitude; 
} 


public String getBarname() { 
    return barname; 
} 

public void setBarname(String barname) { 
    this.barname = barname; 
}} 

Answer 1

.... 여기에 사전에 지금까지 ... 감사 해요 this

Answer 2

당신은 당신이

for (int i = 0; i < parentArray.length(); i++) { 


JSONObject finalObject = parentArray.getJSONObject(i); 
Bardata barData = gson.fromJson(finalObject.toString(), Bardata.class); 
bardataList.add(barData); 


lat = barData.getLatitude(); 
lng = barData.getLongitude(); 
LatLng latLng1 = new LatLng(lat, lng); 

runOnUiThread(new Runnable() { 
    public void run() { 
    try { 

    mMap.addMarker(new MarkerOptions().position(latLng1).title("Marker")); 
    mMap.setMyLocationEnabled(true); 

    } catch (JSONException e) { 
    Log.e(LOG_TAG, "Error adding marker", e); 
    } 
    } 
}); 
}