我有问题，因为我已经举例说明了这样的地图，但就我而言，我想在地图上列出每个国家的人数。 geojson文件应每一个坐标具有一个更多的属性“数字”。可能吗？我在Android上用Java编写代码。

Example of circle layer

Geojson example file

编辑： 现在，我的小观点没有正确地聚类。缩小后的紫色（5）和深蓝色（4）应该给出9点的红点。现在我得到了没有数字的蓝点（我知道我只计算点数，这就是为什么是蓝色的原因。）

public class CovidMapFragment extends Fragment implements CovidMapContract.View {

    private MapView mapView;
    private MapboxMap mapboxMap;
    private Mainactivity activity;
    private CovidMapPresenter presenter;

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        activity = (Mainactivity) context;
    }
    @Override
    public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
        Mapbox.getInstance(activity,getString(R.string.mapbox_access_token));
        View view = inflater.inflate(R.layout.fragment_map,container,false);
        return view;
    }

    @Override
    public void onViewCreated(View view,Bundle savedInstanceState) {
        super.onViewCreated(view,savedInstanceState);

        mapView = activity.findViewById(R.id.mapView);

        mapView.onCreate(savedInstanceState);
        mapView.getMapAsync(new OnmapReadyCallback() {
            @Override
            public void onmapReady(@NonNull MapboxMap map) {

                mapboxMap = map;

                map.setStyle(Style.LIGHT,new Style.OnStyleLoaded() {
                    @Override
                    public void onStyleLoaded(@NonNull Style style) {


                        style.setTransition(new TransitionOptions(0,false));

                        mapboxMap.animateCamera(CameraUpdateFactory.newLatLngzoom(new LatLng(
                                51.919438,19.145136),3));

                        addClusteredGeoJsonSource(style);
                        style.addImage(
                                "cross-icon-id",Objects.requireNonNull(BitmapUtils.getBitmapFromDrawable(getResources().getDrawable(R.drawable.ic_circle))),true
                        );

                        Toast.makeText(activity,R.string.app_name,Toast.LENGTH_SHORT).show();
                    }
                });
            }
        });


    }
    private void addClusteredGeoJsonSource(@NonNull Style loadedMapStyle) {


        try {
            loadedMapStyle.addSource(

                    new GeoJsonSource("earthquakes",new URI("asset://earthquakes.geojson"),new GeoJsonOptions()
                                    .withCluster(true)
                                    .withClusterMaxzoom(14)
                                    .withClusterRadius(50)
                    )
            );
        } catch (URISyntaxException uriSyntaxException) {
            Timber.e("Check the URL %s",uriSyntaxException.getMessage());
        }


        SymbolLayer unclustered = new SymbolLayer("unclustered-points","earthquakes");

        unclustered.setProperties(
                iconImage("cross-icon-id"),iconSize(
                        division(
                                get("cases"),literal(4.0f)
                        )
                ),iconColor(
                        interpolate(exponential(1),get("cases"),stop(2.0,rgb(0,255,0)),stop(4,255)),stop(7.0,rgb(255,0))
                        )
                )
        );
        unclustered.setfilter(has("cases"));
        loadedMapStyle.addLayer(unclustered);


        int[][] layers = new int[][] {
                new int[] {7,ContextCompat.getcolor(activity.getapplicationContext(),R.color.red)},new int[] {4,R.color.green)},new int[] {0,R.color.blue)}
        };

        for (int i = 0; i < layers.length; i++) {

            CircleLayer circles = new CircleLayer("cluster-" + i,"earthquakes");
            circles.setProperties(
                    circleColor(layers[i][1]),circleRadius(18f)
            );

            Expression pointCount = toNumber(get("point_count"));


            circles.setfilter(
                    i == 0
                            ? all(has("point_count"),gte(pointCount,literal(layers[i][0]))
                    ) : all(has("point_count"),literal(layers[i][0])),lt(pointCount,literal(layers[i - 1][0]))
                    )
            );
            loadedMapStyle.addLayer(circles);
        }


        SymbolLayer count = new SymbolLayer("count","earthquakes");
        count.setProperties(
                //textField(Expression.toString(get("point_count"))),textField(Expression.toString(get("cases"))),textSize(12f),textColor(Color.WHITE),textIgnorePlacement(true),textAllowOverlap(true)
        );
        loadedMapStyle.addLayer(count);
    }

    @Override
    public void onStart() {
        super.onStart();
        mapView.onStart();
    }

    @Override
    public void onResume() {
        super.onResume();
        mapView.onResume();
    }

    @Override
    public void onPause() {
        super.onPause();
        mapView.onPause();
    }

    @Override
    public void onStop() {
        super.onStop();
        mapView.onStop();
    }

    @Override
    public void onLowMemory() {
        super.onLowMemory();
        mapView.onLowMemory();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mapView.onDestroy();
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        mapView.onSaveInstanceState(outState);
    }


    @Override
    public void showMessage(String message) {
        System.out.println("Fragment");
    }


}

Actual effect 1

Actual effect 2

geojson file