Process: com.example.micha.locationtest, PID: 8302
                                                                              java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.micha.locationtest/com.example.micha.locationtest.activities.MapsActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'double android.location.Location.getLatitude()' on a null object reference
                                                                                  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3150)
                                                                                  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3260)
                                                                                  at android.app.ActivityThread.access$1000(ActivityThread.java:218)
                                                                                  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1734)
                                                                                  at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                                  at android.os.Looper.loop(Looper.java:145)
                                                                                  at android.app.ActivityThread.main(ActivityThread.java:6934)
                                                                                  at java.lang.reflect.Method.invoke(Native Method)
                                                                                  at java.lang.reflect.Method.invoke(Method.java:372)
                                                                                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
                                                                                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
                                                                               Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'double android.location.Location.getLatitude()' on a null object reference
                                                                                  at com.example.micha.locationtest.activities.MapsActivity.onCreate(MapsActivity.java:76)

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {

        private GoogleMap mMap;
        private GPSTracker gpsTracker;
        private Location location;
        private double lat, lng;

        private RecyclerView mRecyclerView;
        private MyAdapter mAdapter;
        private LinearLayoutManager linearLayoutManager;

        private List<WashLocation> washLocations;

        private Button favoriteWashesButton;
        private Button isFavorite;
        List<String> spinnerArray = new ArrayList<String>();
        Spinner sItems;
        String choosenDistance;
        private static DataBaseHelper dataBaseHelper;
        AlertDialog alert;


        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_maps);
            LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);

            if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
                dataBaseHelper = new DataBaseHelper(getApplicationContext());
                gpsTracker = new GPSTracker(getApplicationContext());
                location = gpsTracker.getLocation();
                lat = location.getLatitude();
                lng = location.getLongitude();
                // Obtain the SupportMapFragment and get notified when the map is ready to be used.
                SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                        .findFragmentById(R.id.map);
                mapFragment.getMapAsync(this);

                spinnerArray.add("3000m");
                spinnerArray.add("25000m");
                spinnerArray.add("50000m");

                ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                        this, android.R.layout.simple_spinner_item, spinnerArray);

                adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                sItems = (Spinner) findViewById(R.id.spinner);
                sItems.setAdapter(adapter);
                choosenDistance = sItems.getSelectedItem().toString();

                StringBuilder sb = new StringBuilder(choosenDistance);
                choosenDistance = sb.deleteCharAt(sb.indexOf("m")).toString();


                //washLocations = dataBaseHelper.getWashLocation();
                washLocations = new ArrayList<>();
                mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
                mAdapter = new MyAdapter(washLocations, this);
                mRecyclerView.setAdapter(mAdapter);
                mRecyclerView.setLayoutManager(new LinearLayoutManager(this));

                List<WashLocation> washLocation = dataBaseHelper.getWashLocation();
                List<WashLocation> favouriteWashLocation = dataBaseHelper.getFavouriteWashLocation();
                List<WashLocation> favouriteWashLocation1 = dataBaseHelper.getFavouriteWashLocation();


                favoriteWashesButton = (Button) findViewById(R.id.favoriteWashes);
                favoriteWashesButton.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Intent intent = new Intent(MapsActivity.this, FavWashActivity.class);
                        startActivity(intent);
                    }
                });
            } else {
                showGPSDisabledAlertToUser();
            }


        }


        private void showGPSDisabledAlertToUser() {
            AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
            alertDialogBuilder.setMessage("GPS is disabled in your device. Would you like to enable it?")
                    .setCancelable(false)
                    .setPositiveButton("Goto Settings Page To Enable GPS",
                            new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog, int id) {
                                    Intent callGPSSettingIntent = new Intent(
                                            android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                                    startActivity(callGPSSettingIntent);
                                    dialog.cancel();
                                }
                            });
            alertDialogBuilder.setNegativeButton("Cancel",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int id) {
                            dialog.cancel();
                        }
                    });
            alert = alertDialogBuilder.create();
            alert.show();
        }

        Location washL;
        LatLng washLocation;

        @Override
        public void onMapReady(final GoogleMap googleMap) {
            mMap = googleMap;
  sItems.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

                    @Override
                    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                        float v = myL.distanceTo(washL);
                        if ((myL.distanceTo(washL)) <= Float.parseFloat(choosenDistance)) {
                            googleMap.addMarker(new MarkerOptions().position(washLocation).title(" is here"));
                        } else {
                            Toast.makeText(getApplicationContext(), "W tym zasięgu nie ma żadnych myjń", Toast.LENGTH_SHORT).show();
                        }
                    }

                    @Override
                    public void onNothingSelected(AdapterView<?> parent) {
                    }
                });*//*

            }
            googleMap.moveCamera(CameraUpdateFactory.newLatLng(myLocation));
            googleMap.animateCamera(CameraUpdateFactory.zoomTo(14), 2000, null);
            googleMap.addMarker(new MarkerOptions().position(washLocation).title("I'm here"));*/


            sItems.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

                @Override
                public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                    LatLng myLocation = new LatLng(lat, lng);
                    String latitude = String.valueOf(myLocation.latitude);
                    String longitude = String.valueOf(myLocation.longitude);

                    StringBuilder sb = new StringBuilder(sItems.getSelectedItem().toString());
                    String distance = sb.deleteCharAt(sb.indexOf("m")).toString();

                    String radius = distance; // 20 Kilometer
                    List<WashLocation> washLocationList = new ArrayList<>();
                    List<WashLocation> favouriteWashLocation = dataBaseHelper.getFavouriteWashLocation();
                    List<WashLocation> washLocation = dataBaseHelper.getWashLocation();

                    MyAsyncTask myAsyncTask = new MyAsyncTask();

                    try {
                        JSONObject jsonObject = myAsyncTask.execute(latitude, longitude, radius).get();
                        String lat;
                        String lng;
                        String name = "";
                        String city = "";
                        String placeId = "";

                        if (jsonObject.has("results")) {
                            JSONArray jsonArray = jsonObject.getJSONArray("results");
                            for (int n = 0; n < jsonArray.length(); n++) {
                                JSONObject jsonObject1 = jsonArray.getJSONObject(n);
                                lat = jsonObject1.getJSONObject("geometry").getJSONObject("location").get("lat").toString();
                                lng = jsonObject1.getJSONObject("geometry").getJSONObject("location").get("lng").toString();

                                JSONObject oName = jsonArray.getJSONObject(n);
                                if (oName.has("name")) {
                                    name = oName.getString("name");
                                }

                                JSONObject oVicinity = jsonArray.getJSONObject(n);
                                if (oVicinity.has("vicinity")) {
                                    city = oVicinity.getString("vicinity");
                                }
                                JSONObject oPlaceId = jsonArray.getJSONObject(n);
                                if (oPlaceId.has("place_id")) {
                                    placeId = oPlaceId.getString("place_id");
                                }
                                WashLocation w = new WashLocation(name, lat, lng, 0, getCity(city), null, placeId);
                                washLocations.add(w);
                                googleMap.addMarker(new MarkerOptions().position(new LatLng(Double.parseDouble(w.getLat()), Double.parseDouble(w.getLng()))).title(w.getWashName()));
                                googleMap.moveCamera(CameraUpdateFactory.newLatLng(myLocation));
                                googleMap.animateCamera(CameraUpdateFactory.zoomTo(11), 2000, null);
                                mAdapter.notifyDataSetChanged();
                            }
                        }
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    } catch (ExecutionException e) {
                        e.printStackTrace();
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }

                @Override
                public void onNothingSelected(AdapterView<?> parent) {
                }


            });


        }

        public MyAdapter getmAdapter() {
            return mAdapter;
        }

        private String getCity(String s) {
            int i = s.lastIndexOf(',');
            return s.substring(i, s.length());
        }


        @Override
        protected void onDestroy() {
            super.onDestroy();
            if(alert != null) { alert.dismiss(); }
            gpsTracker = new GPSTracker(getApplicationContext());
        }
    }