Question

我一直试图让SpatialReference在ArcGIS中运行，无论我尝试什么，我都无法让它工作，任何帮助表示赞赏。这是我的代码

wgs84 = SpatialReference.create(SpatialReference.WKID_WGS84);


    SimpleMarkerSymbol simpleMarker = new SimpleMarkerSymbol(Color.RED, 5,SimpleMarkerSymbol.STYLE.CIRCLE);


    Point pointGeometry = new Point(-35.238019 ,149.083404,0,SpatialReference.WKID_WGS84);
   /* Point pointGeometry = new Point(16596066.8,-3896170.7);*/

    Graphic pointGraphic = new Graphic(pointGeometry, simpleMarker);


    mGraphicsLayer.addGraphic(pointGraphic);

Answer 1

两个问题：

以正确的顺序指定坐标。无论何时指定坐标，都需要检查ArcGIS Runtime文档（10.2.x，Quartz）以查看要使用的订单。创建Point时，首先指定X（经度），然后指定Y（纬度）。 149.083404不是有效的纬度，所以我认为你的意思是经度。切换它们。
除非文档说“经度”和“纬度”，否则假设地图坐标。这意味着你需要使用GeometryEngine.project将你的点投射到地图的空间参考，除非你打电话给方法的参数为longitude和latitude，而不是x和y。

我无法判断您是使用10.2.x还是使用Quartz Beta - 您使用的是每个元素 - 所以这是使用每个API的工作示例。

Quartz（假设您已在布局XML中声明了MapView）：

public class MainActivity extends AppCompatActivity {

    private MapView mMapView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mMapView = (MapView) findViewById(R.id.mapView);
        // ArcGISMap constructor takes latitude (Y) first
        ArcGISMap map = new ArcGISMap(Basemap.Type.TOPOGRAPHIC,
                -35.238019, 149.083404, 10);
        mMapView.setMap(map);

        GraphicsOverlay graphicsLayer= new GraphicsOverlay();
        mMapView.getGraphicsOverlays().add(graphicsLayer);

        SimpleMarkerSymbol simpleMarker = new SimpleMarkerSymbol(
                SimpleMarkerSymbol.Style.CIRCLE, Color.RED, 5);
        // Point constructor takes X (longitude) first
        Point pointGeometry = new Point(
                149.083404, -35.238019, 0, SpatialReference.create(4326));
        Graphic pointGraphic = new Graphic(pointGeometry, simpleMarker);
        graphicsLayer.getGraphics().add(pointGraphic);
    }

    @Override
    protected void onPause(){
        mMapView.pause();
        super.onPause();
    }

    @Override
    protected void onResume(){
        super.onResume();
        mMapView.resume();
    }
}

10.2.x（假设您在布局XML文件中声明了MapView MapOptions}：

public class MainActivity extends AppCompatActivity {

    private MapView mMapView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

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

        mMapView.setOnStatusChangedListener(new OnStatusChangedListener() {
            @Override
            public void onStatusChanged(Object o, STATUS status) {
                if (STATUS.INITIALIZED.equals(status)) {
                    // MapOptions constructor takes latitude (Y) first
                    MapOptions mapOptions = new MapOptions(
                            MapOptions.MapType.TOPO, -35.238019, 149.083404, 10);
                    mMapView.setMapOptions(mapOptions);

                    GraphicsLayer graphicsLayer = new GraphicsLayer();
                    mMapView.addLayer(graphicsLayer);

                    SimpleMarkerSymbol simpleMarker = new SimpleMarkerSymbol(
                            Color.RED, 5, SimpleMarkerSymbol.STYLE.CIRCLE);
                    // GeometryEngine.project takes X (longitude) first
                    Point pointGeometry = GeometryEngine.project(
                            149.083404, -35.238019, mMapView.getSpatialReference());
                    Graphic pointGraphic = new Graphic(pointGeometry, simpleMarker);
                    graphicsLayer.addGraphic(pointGraphic);
                }
            }
        });
    }

    @Override
    protected void onPause(){
        mMapView.pause();
        super.onPause();
    }

    @Override
    protected void onResume(){
        super.onResume();
        mMapView.unpause();
    }
}

无法使SpatialReference工作（ArcGIS）

1 个答案: