Cfrgtkky

This is the part of code which i am trying to do please any one help me I am new to android develpment

This is the exact error which I am getting:
java.lang.IllegalStateException: The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. Make sure your adapter calls notifyDataSetChanged() when its content changes. [in ListView(2131165289, class android.widget.ListView) with Adapter(class android.widget.ArrayAdapter)]

ListView requestListView;



ArrayList<String> requests = new ArrayList<String>();



ArrayAdapter arrayAdapter;



LocationManager locationManager;



LocationListener locationListener;



ArrayList<Double> requestLatitude = new ArrayList<Double>();



ArrayList<Double> requestLongitude = new ArrayList<Double>();



ArrayList<String> UserNames = new ArrayList<String>();



Button refresh;



public void updateListView(Location location){



    if(location!=null) {



        requests.clear();



        ParseQuery<ParseObject> query = new ParseQuery<ParseObject>("Request");



        final ParseGeoPoint geoPointLocation = new ParseGeoPoint(location.getLatitude(), location.getLongitude());



        query.whereNear("location",geoPointLocation);



        query.whereDoesNotExist("driverUserName");



        query.setLimit(10);



        query.findInBackground(new FindCallback<ParseObject>() {

            @Override

            public void done(List<ParseObject> objects, ParseException e) {



                if(e==null){

                    if(objects.size()>0){



                        requests.clear();



                        requestLongitude.clear();



                        requestLatitude.clear();



                        for (ParseObject object:objects){



                            ParseGeoPoint requestLocation = (ParseGeoPoint) object.get("location");



                            if(requestLocation!=null) {



                                Double distanceinMiles = geoPointLocation.distanceInKilometersTo(requestLocation);



                                Double DistanceOneDP = (double) Math.round(distanceinMiles * 10) / 10;



                                requests.add(DistanceOneDP.toString() + "Km");



                                arrayAdapter.notifyDataSetChanged();



                                requestLatitude.add(requestLocation.getLatitude());



                                requestLongitude.add(requestLocation.getLongitude());



                                UserNames.add(object.getString("username"));





                            }

                        }

                    }else{



                        requests.clear();



                        requests.add("No Near By request");

                    }



                    arrayAdapter.notifyDataSetChanged();



                }

            }

        });

    }



}

Set adapter to Listview

requestListView.setAdapter(arrayAdapter);
then

arrayAdapter.notifyDataSetChanged();

Try this way first to set adapter into listview.

requestListView.setAdapter(adapter);

after that called arrayAdapter.notifyDataSetChanged();