java - Google Maps API markers dissapear - 


package com.example.sander.app;  import android.app.fragment;  /**  * created sander on 4-4-2017.  */  import android.app.fragment; import android.content.pm.packagemanager; import android.location.address; import android.location.geocoder; import android.os.bundle; import android.support.annotation.nullable; import android.support.v4.app.activitycompat; import android.support.v4.content.contextcompat; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.manifest;  import com.android.volley.request; import com.android.volley.requestqueue; import com.android.volley.response; import com.android.volley.volleyerror; import com.android.volley.toolbox.stringrequest; import com.android.volley.toolbox.volley; import com.google.android.gms.maps.cameraupdatefactory; import com.google.android.gms.maps.googlemap; import com.google.android.gms.maps.mapfragment; import com.google.android.gms.maps.mapview; import com.google.android.gms.maps.mapsinitializer; import com.google.android.gms.maps.onmapreadycallback; import com.google.android.gms.maps.model.bitmapdescriptorfactory; import com.google.android.gms.maps.model.latlng; import com.google.android.gms.maps.model.markeroptions;  import org.json.jsonarray; import org.json.jsonexception; import org.json.jsonobject;  import java.util.arraylist; import java.util.list; import java.util.locale;   public class googlemaps extends fragment implements onmapreadycallback {     list<string> list = new arraylist<>();     list<double> latitude = new arraylist<>();     list<double> longitude = new arraylist<>();     integer mlatitude = 0;     integer mlongitude = 0;     integer names = 0;     @nullable     @override     public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {         requestqueue rq = volley.newrequestqueue(getactivity().getapplicationcontext());          string url= "http://test.dontstealmywag.ga/api/parkgarage.php";          stringrequest stringrequest = new stringrequest(request.method.get, url,                 new response.listener<string>() {                     @override                     public void onresponse(string response) {                         // response                          try{                              jsonobject o = new jsonobject(response);                             jsonarray values=o.getjsonarray("parkgarage");                              ( int i=0; i< values.length(); i++) {                                  jsonobject sonuc = values.getjsonobject(i);                                 list.add("name: " + sonuc.getstring("parkgarage_name") + "\n");                                 longitude.add(sonuc.getdouble("langitude"));                                 latitude.add(sonuc.getdouble("longitude"));                              }                            }  catch (jsonexception ex){}                      }                 },                 new response.errorlistener() {                     @override                     public void onerrorresponse(volleyerror error) {                         // handle error                     }                 });           rq.add(stringrequest );         return inflater.inflate(r.layout.fragment_gmaps, container, false);     }      @override     public void onviewcreated(view view, bundle savedinstancestate) {         super.onviewcreated(view, savedinstancestate);          mapview mapview = (mapview) view.findviewbyid(r.id.map);         mapview.oncreate(savedinstancestate);          mapview.onresume(); // needed map display          try {             mapsinitializer.initialize(getactivity().getapplicationcontext());         } catch (exception e) {             e.printstacktrace();         }         mapview.getmapasync(this);      }     integer = 0;     @override     public void onmapready(googlemap googlemap) {          latlng marker = new latlng(51.9244201, 4.4777325);         for(i = 0; < list.size(); i++){             googlemap.addmarker(new markeroptions().title(list.get(i)).position(new latlng(longitude.get(i), latitude.get(i))));         }          googlemap.movecamera(cameraupdatefactory.newlatlngzoom(marker, 12));         //googlemap.addmarker(new markeroptions().title(list.get(1)).position(marker));          if (activitycompat.checkselfpermission(getactivity(), manifest.permission.access_fine_location) != packagemanager.permission_granted && activitycompat.checkselfpermission(getactivity(), manifest.permission.access_coarse_location) != packagemanager.permission_granted) {             // todo: consider calling             //    activitycompat#requestpermissions             // here request missing permissions, , overriding             //   public void onrequestpermissionsresult(int requestcode, string[] permissions,             //                                          int[] grantresults)             // handle case user grants permission. see documentation             // activitycompat#requestpermissions more details.             return;         }         googlemap.setmylocationenabled(true);         googlemap.getuisettings().setcompassenabled(true);         googlemap.getuisettings().setmylocationbuttonenabled(true);      } }

i'm building app adds markers on map. getting name, lat & long json. maps inside fragment. @ start when click "maps" add markers, second time when click on "maps" markers disapear. me fix issue?


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