accept.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        customDialog.dismiss();

        Location userClickedLocation = mRealm.createObject(Location.class);
        String address = getAddressFromLngLat(point.getLatitude(), point.getLongitude());
        Latitude lat = point.getLatitude();
        Longitude long = point.getLongitude();

        saveToDb(address, lat, long);

        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.setPosition(point);
        mapboxMap.addMarker(markerOptions);
    }
});

private void saveToDb(String address, lat: Latitude, long: Longitude) {
    new HandlerThread("RealmThread") {
        @Override
        protected void onLooperPrepared() {
            mRealm.beginTransaction();

            Location userClickedLocation = mRealm.createObject(Location.class);
            userClickedLocation.setAddress(address);
            userClickedLocation.setLat(lat);
            userClickedLocation.setLng(long);
            mRealm.commitTransaction();
        }
    }.start();
}