android - Journey mornitoring - stop working when adding marker to map -

my location app ok. purpose change app journey monitoring. idea getting information website containing current latitude , longitude of vehicle. added url request runnable. received java.lang.illegalstateexception: not on main thread, com.google.android.gms.maps.internal.igooglemapdelegate$a$a.addmarker(unknown source) , com.google.android.gms.maps.googlemap.addmarker(unknown source). how can solve this.

activity:

package tri.mylocapp; //import... public class mainactivity extends activity{      googlemap googlemap = null;     latlng latlng;     locationmanager lm;     string provider;     location location;     markeroptions marker;     double lat,lng;     url url;     urlconnection conn;     string str;      @override     protected void oncreate(bundle savedinstancestate) {          super.oncreate(savedinstancestate);          if (isgoogleplay()){          setcontentview(r.layout.activity_main);          setupmap();          }     }      private boolean isgoogleplay(){          int status = googleplayservicesutil.isgoogleplayservicesavailable(this);          if (status == connectionresult.success){             log.d("mytag", "google ok");             return true;          }          else{             log.d("mytag","google not ok");             toast.maketext(this, "googleplay not available", toast.length_short).show();          }          return false;          }      private void setupmap(){         if (googlemap == null){             log.d("mytag", "googlemap null, making available");             googlemap = ((mapfragment)getfragmentmanager().findfragmentbyid(r.id.map)).getmap();              if (googlemap != null){                 log.d("mytag", "googlemap not null");                 googlemap.setmylocationenabled(true);                  runnable r = new runnable() {                  @override                 public void run() {                                  try {                         url = new url("http://thinktodo.net/locationservicesystem/index.php/location/getlocation?username=1");                         conn = (httpurlconnection) url.openconnection();                         bufferedreader br = new bufferedreader(new inputstreamreader(conn.getinputstream()));                         str = br.readline();                         jsonobject jsonobject = new jsonobject(str);                         final double lat = jsonobject.getdouble("lat");                         final double lng = jsonobject.getdouble("lng");                         latlng = new latlng(lat, lng);                         marker = new markeroptions().position(new latlng(latlng.latitude, latlng.longitude)).title("you here");                         googlemap.addmarker(marker);                         googlemap.movecamera(cameraupdatefactory.newlatlng(latlng));                         googlemap.animatecamera(cameraupdatefactory.zoomto(10));                         br.close();                          } catch (malformedurlexception e) {                         e.printstacktrace();                         } catch (ioexception e) {                         e.printstacktrace();                         } catch (jsonexception e) {                         e.printstacktrace();                         }                                    }                 };                 thread th = new thread(r);                 th.start();             }         }     } 

}

main_activity.xml:

<?xml version="1.0" encoding="utf-8"?> <fragment xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/map"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:name="com.google.android.gms.maps.mapfragment"/> 

logcat:

04-23 02:49:51.250: e/socketstream(112): readfully waiting 403440 bytes, got 49152  04-23 02:49:51.254: e/socketstream(112): readfully waiting 354288 bytes, got 49152  04-23 02:49:51.254: e/socketstream(112): readfully waiting 305136 bytes, got 49152  04-23 02:49:51.254: e/socketstream(112): readfully waiting 255984 bytes, got 70084  04-23 02:49:51.254: e/socketstream(112): readfully waiting 185900 bytes, got 49152  04-23 02:49:51.254: e/socketstream(112): readfully waiting 136748 bytes, got 49152  04-23 02:49:51.254: e/socketstream(112): readfully waiting 87596 bytes, got 49152  04-23 02:49:51.298: e/trace(1692): error opening trace file: no such file or directory (2) 04-23 02:49:51.858: e/androidruntime(1692): fatal exception: thread-180 04-23 02:49:51.858: e/androidruntime(1692): java.lang.illegalstateexception: not on main thread 04-23 02:49:51.858: e/androidruntime(1692): @ maps.k.o.b(unknown source) 04-23 02:49:51.858: e/androidruntime(1692): @ maps.i.g.b(unknown source) 04-23 02:49:51.858: e/androidruntime(1692): @ maps.e.al.a(unknown source) 04-23 02:49:51.858: e/androidruntime(1692): @ etl.ontransact(sourcefile:167) 04-23 02:49:51.858: e/androidruntime(1692): @ android.os.binder.transact(binder.java:326) 04-23 02:49:51.858: e/androidruntime(1692): @ com.google.android.gms.maps.internal.igooglemapdelegate$a$a.addmarker(unknown source) 04-23 02:49:51.858: e/androidruntime(1692): @ com.google.android.gms.maps.googlemap.addmarker(unknown source) 04-23 02:49:51.858: e/androidruntime(1692): @ tri.mylocapp.mainactivity$1.run(mainactivity.java:88) 04-23 02:49:51.858: e/androidruntime(1692): @ java.lang.thread.run(thread.java:856) 04-23 02:49:51.930: e/socketstream(112): readfully waiting 403440 bytes, got 49152  04-23 02:49:51.930: e/socketstream(112): readfully waiting 354288 bytes, got 49152  04-23 02:49:51.930: e/socketstream(112): readfully waiting 305136 bytes, got 49152  04-23 02:49:51.930: e/socketstream(112): readfully waiting 255984 bytes, got 49152  04-23 02:49:51.930: e/socketstream(112): readfully waiting 206832 bytes, got 16384  04-23 02:49:51.930: e/socketstream(112): readfully waiting 190448 bytes, got 97988  04-23 02:49:51.934: e/socketstream(112): readfully waiting 92460 bytes, got 49152  04-23 02:49:51.934: e/socketstream(112): readfully waiting 43308 bytes, got 32768  

the problem modifying map on different thread should modified on ui thread/main thread..

                        latlng = new latlng(lat, lng);                         marker = new markeroptions().position(new latlng(latlng.latitude, latlng.longitude)).title("you here");                         googlemap.addmarker(marker);                         googlemap.movecamera(cameraupdatefactory.newlatlng(latlng));                         googlemap.animatecamera(cameraupdatefactory.zoomto(10)); 

that problem came from...

solution:

use asynctask server connection , parsing on doinbackground , when successfull modifying of map on postexecute