save and load LatLng

I have map activity in my app which displays 2 markers and a polyline that I want to be saved.

My app has foreground service to track user location,however when I am I launch the app through the notification,the addresslocation is null,which mean it didn't saved the latlng..

I tried using sharedprefrencess to save cords of the markers and the polyline but with no success,does anyone has any better solution ?

My markers and polyline:

        line = mMap.addPolyline(new PolylineOptions()                .add(new LatLng(addressLatLng.latitude, addressLatLng.longitude), new LatLng(userLocation.latitude, userLocation.longitude))                .width(10)                .color(Color.RED));            destinationMarker = mMap.addMarker(new MarkerOptions().position(addressLatLng).title("Destination - " + mAddress).icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_BLUE))); // Destination Address            startMarker = mMap.addMarker(new MarkerOptions().position(new LatLng(userLocation.latitude, userLocation.longitude)).title("Your Starting Location").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED))); // Start Location

Thanks for your suggestions.