Marker not showing on map in Android

Question

I just created a Google Maps fragment. The marker sydney is not showing... Did I forget to add something? I've add my Google Maps key

class fragment_map : Fragment() {

    private val callback = OnMapReadyCallback { googleMap ->
        /**
         * Manipulates the map once available.
         * This callback is triggered when the map is ready to be used.
         * This is where we can add markers or lines, add listeners or move the camera.
         * In this case, we just add a marker near Sydney, Australia.
         * If Google Play services is not installed on the device, the user will be prompted to
         * install it inside the SupportMapFragment. This method will only be triggered once the
         * user has installed Google Play services and returned to the app.
         */
        val sydney = LatLng(-34.0, 151.0)
        googleMap.addMarker(MarkerOptions().position(sydney).title("Marker in Sydney"))
        googleMap.moveCamera(CameraUpdateFactory.newLatLng(sydney))
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.fragment_map, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        val mapFragment = childFragmentManager.findFragmentById(R.id.map) as SupportMapFragment?
        mapFragment?.getMapAsync(callback)
    }
}

Answer 1

Your onMapReady seems incomplete. Try this maybe?

override fun onMapReady(googleMap: GoogleMap) {
    mMap = googleMap

    val boundsBuilder = LatLngBounds.Builder()
    val sydney = LatLng(-34.0, 151.0)
    boundsBuilder.include(latlng)         
    Map.addMarker(MarkerOptions().position(latlng).title("Sydney"))
    mMap.moveCamera(CameraUpdateFactory.newLatLngBounds(boundsBuilder.build(), 1000, 1000, 0))
    }