android - 每个分钟标记都平滑移动，但不会删除 android map 上的旧标记

Question

1. 我正在从共享首选项中获取每分钟经纬度，并在 map 上显示。

2. 标记每分钟都在完美移动，但没有删除旧标记(它显示每分钟新标记。

3. 但是关闭和打开 map fragment 它完美地显示了单个标记。

4. 请帮我解决这个问题。我也试过 Marker.Remove

5. 我在 OnLocation Changed Method 中调用了以下方法。

   /* 在UI上显示位置的方法 */

   private void displayLocation()
   {
   
   
       try
       {
   
           mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
   
           if (mLastLocation != null)
           {
               double latitude = mLastLocation.getLatitude();
               double longitude = mLastLocation.getLongitude();
   
   
   
               // get user data from session
               HashMap<String, String> user = session.getGPSPING();
   
               // UserLat
               String  LatLongUser="";
               LatLongUser = user.get(SessionManagerFor_Register.KEY_LATLONG);
   
   
   
   
               if(!LatLongUser.equals(""))
               {
   
                   Log.i(" PING on MAP LatLong", LatLongUser);
   
                   String[] LanlongArr = LatLongUser.split("//");
                   List<String> Lanlonglist1 = Arrays.asList(LanlongArr);
   
                   int length = Lanlonglist1.size();
   
                   arraylist_DetailLineWalker = new ArrayList<String(length);
   
                   for (int i = 0; i < length; i++)
                   {
   
   
                       arraylist_DetailLineWalker.add(Lanlonglist1.get(i));
                   }
   
                   if(arraylist_DetailLineWalker!=null)
                   {
   
                       for (int i = 0; i < arraylist_DetailLineWalker.size(); i++)
                       {
                           try {
                               String Val = arraylist_DetailLineWalker.get(i).toString();
                               //Log.i(" Validation Id",Val);
                               VALUE_ARRAY_STRING = Val.toString().split("::");
   
                               LatLong_DataSaveTable = VALUE_ARRAY_STRING[0].toString();
   
   
                               System.out.println("checking STarted" + LatLong_DataSaveTable);
   
                               String[] latlong = LatLong_DataSaveTable.split(",");
                               double latitude1 = Double.parseDouble(latlong[0]);
                               double longitude2 = Double.parseDouble(latlong[1]);
   
                               //To hold location
                               LatLng latLng1 = new LatLng(latitude1, longitude2);
                               //To create marker in map
                               MarkerOptions markerOptionsLineWalker = new MarkerOptions();
                               markerOptionsLineWalker.position(latLng1); //setting position
                               markerOptionsLineWalker.draggable(true); //Making the marker draggable
                               markerOptionsLineWalker.title("Walker Location");
   
                               markerOptionsLineWalker.icon(BitmapDescriptorFactory.fromResource(R.drawable.walker_outof_fence_icon_red));
   
   
                               Marker marker1 = googleMap.addMarker(markerOptionsLineWalker);
                               if (marker1 != null)
                               {
                                   marker1.remove();
                               }
                               //adding marker to the map
                               googleMap.addMarker(markerOptionsLineWalker);
                               // marker1.setPosition(latLng1);
                               Log.i(TAG, "Walker PING Added.............................");
   
                           } catch (NumberFormatException e) {
                               e.printStackTrace();
                           }
   
                       }
   
                   }
                   else
                   {
                       Log.i("MAP NEwLatLong","TOTAL ARRY LIST NULLL");
                   }
   
   
               }
               else
               {
                   Log.i("MAP NEwLatLong","Null Not LatLong");
   
   
               }
   
   
           }
           else
           {
   
               Log.i("Location EXception","Couldn't get the location. Make sure location is enabled on the device");
               // can't get location
               // GPS or Network is not enabled
               // Ask user to enable GPS/network in settings
               gps.showSettingsAlert();
           }
   
       }
       catch (Exception e)
       {
           e.printStackTrace();
       }
   
   
   }
   

Answer 1

试试这个....

  Marker now;
  @Override
  public void onLocationChanged(Location location) {

  if(now != null){
        now.remove();   //if the marker is already added then remove it
    }

   // Getting latitude of the current location
   double latitude = location.getLatitude();

   // Getting longitude of the current location
    double longitude = location.getLongitude();

  // Creating a LatLng object for the current location
    LatLng latLng = new LatLng(latitude, longitude);
    now = googleMap.addMarker(new MarkerOptions().position(latLng)));
 }

要引用，请访问此...

https://stackoverflow.com/a/16312869/6385873