Indexoutofbounds: accessing another class variable

I was trying to access coordinates from my ArrayList from Sample.class using:

This is my MainActivity.class

    public void onMapReady(GoogleMap googleMap) {

        mMap = googleMap;
        mMap.setMinZoomPreference(15.0f);
        mMap.setMaxZoomPreference(20.0f);
        mMap.setOnMapClickListener(this);;

        LatLng latLng = new LatLng(14.397420, 121.033051);
        mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));


        double lat = smsReceiver.locationcoords.get(0);
        double lon = smsReceiver.locationcoords.get(1);


            LatLng geofencePos = new LatLng(lat,lon);
            geofenceMarker = mMap.addMarker(new MarkerOptions()
                .position(geofencePos));

    }
This is my SmsReceiver.class where I am getting the coordinates. I printed the coordinates and it displays the coordinates I am receiving.

ArrayList locationcoords = new ArrayList(); //variable set on public

public void sendDataToFirebase(SmsMessage sms, Context context) {

FirebaseApp.initializeApp(context);
databaseLocation = FirebaseDatabase.getInstance().getReference("smsdata");

String senderNumber = sms.getOriginatingAddress();
String mydate = java.text.DateFormat.getDateTimeInstance().format(Calendar.getInstance().getTime());
String message = sms.getMessageBody();
String[] separatedSMS = message.split("\\s+");
String needHelp = "I NEED HELP";


    DatabaseReference mRef = databaseLocation.push();
    Double latitudedb = Double.parseDouble(separatedSMS[1]);
    Double longitudedb = Double.parseDouble(separatedSMS[3]);


    HashMap<String, Double> coordinates = new HashMap<String, Double>();
    coordinates.put("latitude", latitudedb);
    coordinates.put("longitude", longitudedb);
    mRef.setValue(coordinates);

    locationcoords.add(latitudedb);
    locationcoords.add(longitudedb);

    double lat = locationcoords.get(0);
    double lon = locationcoords.get(1);
    System.out.println(lat);
    System.out.println(lon);




}