public void showAlertDialogButtonClicked(final Event event) {

        // setup the alert builder
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Nytt larm: " + event.getID());
        builder.setMessage("Is aed on site? " + event.getAedOnSite() + "\n" +
                "when did it occur? " + event.getDate_time() + "\n" +
                "People onsite: " + event.getPersonsOnSite() + "\n" +
                "People on the way: " + event.getPersonsOnTheWay());

        // add the buttons
        builder.setPositiveButton("Guida mig dit", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                onTask = true;
                currentEvent = event;
                currentEventLocation = new LatLng(Double.valueOf(event.getLon()), Double.valueOf(event.getLat()));

                guidePersonToEvent();

            }
        });
        builder.setNegativeButton("Avbryt", null);

        // create and show the alert dialog
        AlertDialog dialog = builder.create();
        dialog.show();
    }

    private void guidePersonToEvent() {
        new FetchURL(MapsActivity.this).execute(getUrl(currentLocation, currentEventLocation, "walking"), "walking");

        mMap.addMarker(new MarkerOptions().position(currentEventLocation).
                title("Current Event").
                icon(BitmapDescriptorFactory.fromResource(R.drawable.heartfailure)));
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(currentEventLocation, 12));


    }