将 cartoDB 浏览器中的图层添加到 Android 应用程序

Question

我在 cartoDB 浏览器中有一个带有三层的地图，但我无法在 android 应用程序中的地图中添加图层如何使用 java 代码将 CartoDB 浏览器中的 aKMZ 图层（不是底图）添加到 Android 应用程序以显示应用程序中的所有图层？谁能帮我？💔

添加底图的代码

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    // Register the license so that CARTO online services can be used

    MapView.registerLicense(LICENSE,getApplicationContext());

    // Get 'mapView' object from the application layout

    mapView = (MapView) this.findViewById(R.id.mapView);

    // Add basemap layer to mapView

    CartoOnlineVectorTileLayer baseLayer = new CartoOnlineVectorTileLayer(CartoBaseMapStyle.CARTO_BASEMAP_STYLE_VOYAGER);

    mapView.getLayers().add(baseLayer);

}

Answer 1

我的项目是室内导航系统，所以我需要 cartoDB 地图中的图层来显示 Android App 中的建筑级别

Answer 2

建议的解决方案是使用一些工具预先将 KMZ 转换为 GeoJSON。SDK 本身并没有这样做。在 SDK 中，您可以使用 GeoJSONGeometryReader 来解析 GeoJSON 并将其添加到最后映射为 VectorLayer。我的通用功能来完成这一切：// usage: the file tpr-men.geojson is in assets folder of projectpolygonGeoJSON(mapView,"tpr-men.geojson",android.graphics.Color.LTGRAY);//helper function to read polygons from GeoJSON file, sets stylesprivate void polygonGeoJSON(MapView mapView, final String fileName, int color) {    final Thread thread;// Initialize a local vector data source    final LocalVectorDataSource source = new LocalVectorDataSource(baseProjection);    // Initialize a vector layer with the previous data source    VectorLayer vectorLayer = new VectorLayer(source);    vectorLayer.setVectorElementEventListener(listener);    // Add the clustered vector layer to the map    mapView.getLayers().add(vectorLayer);    LineStyleBuilder lsb = new LineStyleBuilder();    lsb.setColor(new Color(color));    lsb.setWidth(0.5f);    lsb.setLineJoinType(LineJoinType.LINE_JOIN_TYPE_NONE);    lsb.setLineEndType(LineEndType.LINE_END_TYPE_NONE);    PolygonStyleBuilder polygonBuilder = new PolygonStyleBuilder();    polygonBuilder.setColor(new Color(color & 0xbbffffff)); // a bit transparent   //polygonBuilder.setLineStyle(lsb.buildStyle());    final PolygonStyle style = polygonBuilder.buildStyle();    // As the file to load is rather large, we don't want to block our main thread    thread = new Thread(new Runnable() {        @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)        @Override        public void run() {            try {                // Read GeoJSON, parse it using SDK GeoJSON parser                GeoJSONGeometryReader reader = new GeoJSONGeometryReader();                // Set target projection to base (mercator)                reader.setTargetProjection(baseProjection);                Log.d("log","Starting load from .geojson");                // Read features from local asset                String json = loadJSONFromAsset(fileName);                Log.d("log","Finished load from .geojson");                FeatureCollection features = reader.readFeatureCollection(json);                Log.d("log","Finished parsing of geojson, loaded objects: "+features.getFeatureCount());                source.addFeatureCollection(features,style);            } catch (IOException e) {                e.printStackTrace();            }            Log.d("log","Finished load from geojson");        }    });    thread.start();}// general helper function to read file to Stringprivate String loadJSONFromAsset(String fileName) throws IOException {    InputStream is = getAssets().open(fileName);    int size = is.available();    byte[] buffer = new byte[size];    is.read(buffer);    is.close();    return new String(buffer, "UTF-8");}