如何更新標記和識別標記在Google地圖中的位置

我正在創建一個出租車預訂android應用程序。在這裏我通過使用webservice在地圖上添加標記，但問題我能夠改變位置，例如從服務器舊標記更新標記後仍然存在。那麼我如何才能識別舊標記並將其刪除？如何更新標記和識別標記在Google地圖中的位置

public Map<String, Marker> cabsMarker = new HashMap<>(); 
public List<ServiceData> list = new ArrayList<>(); 
private GoogleMap mMap; 



public class ServiceData { 
    public String name; 
    public LatLng location; 

    public ServiceData(LatLng location, String name) { 
     this.location = location; 
     this.name = name; 
    } 
} 
public void add_all_real_time_cabs() throws NullPointerException { 
    broadcastReceiver = new BroadcastReceiver() { 
     @Override 
     public void onReceive(Context context, Intent intent) { 
      if (intent.getAction().equals(GCMPushReceiverService.DATA_MESSAGE_STATUS_SUCCESS)) { 


       try { 
        String message = intent.getStringExtra(GCMPushReceiverService.JSON_ARRAY_RESPONSE); 


        JSONArray jarr = new JSONArray(message); 


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

         JSONObject jsonObject = jarr.getJSONObject(i); 


         All_UserMapDetail driver = new All_UserMapDetail(); 
         if (!jsonObject.isNull(GCMPushReceiverService.FIRST_NAME_DRIVER_KEY)) { 
          driver.setName(jsonObject.getString(GCMPushReceiverService.FIRST_NAME_DRIVER_KEY)); 
          Log.e("driver name", driver.getName()); 

         } 
         if (!jsonObject.isNull(GCMPushReceiverService.DRIVER_PHONE_KEY)) { 
          driver.setPhone(jsonObject.getString(GCMPushReceiverService.DRIVER_PHONE_KEY)); 
         } 
         if (!jsonObject.isNull(GCMPushReceiverService.LAT_DRIVER_KEY)) { 
          driver.setLat(Double.parseDouble(jsonObject.getString(GCMPushReceiverService.LAT_DRIVER_KEY))); 
         } 
         if (!jsonObject.isNull(GCMPushReceiverService.LON_DRIVER_KEY)) { 
          driver.setLon(Double.parseDouble(jsonObject.getString(GCMPushReceiverService.LON_DRIVER_KEY))); 

          Log.e("hgcghcghc", String.valueOf(driver.getLat())); 
         } 

         ServiceData data = new ServiceData(new LatLng(driver.getLat(), driver.getLon()), driver.getName()); 



         list.add(data); 


        } 


        refreshMarkers(); 
       } catch (Exception e) { 
        e.printStackTrace(); 
       } 
      } 
     } 
    }; 
}

這裏是我的refreshMarkers方法。

public void refreshMarkers() { 
    Map<String, Marker> updatedMarkers = new HashMap<String, Marker>(); 
    for (ServiceData data : list) { 
     // if marker exists move its location, if not add new marker 
     Marker marker = cabsMarker.get(data.name); 
     if (marker == null) { 
      marker = mMap.addMarker(new MarkerOptions().position((data.location)).title(data.name)); 
     } else { 
      marker.setPosition(data.location); 
      cabsMarker.remove(data.name); 
     } 
     updatedMarkers.put(data.name, marker); 
     Toast.makeText(getApplicationContext(), "jkbkjbl", Toast.LENGTH_LONG).show(); 
    } 
    // all markers that are left in markers list need to be deleted from the map 
    for (Marker marker : cabsMarker.values()) { 
     marker.remove(); 
    } 

    cabsMarker = updatedMarkers; 
}

任何人都可以幫助我是我錯了嗎？

來源

2016-05-04 Suraj Kumar

您應該在添加新標記之前清除標記列表，然後運行ur refreshmarker函數。

來源

2016-05-04 15:23:29

如何更新標記和識別標記在Google地圖中的位置

回答

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