投影转换

double locy = loc.getLatitude(); double locx = loc.getLongitude();
Point wgspoint = new Point(locx, locy);
Point mapPoint = (Point) GeometryEngine
.project(wgspoint,
SpatialReference.create(4326),
map.getSpatialReference());

//中点

Envelope envelope = new Envelope();
graphic.getGeometry().queryEnvelope(envelope);
envelope.getCenter();

//投影转经纬度

SpatialReference sr4326 = SpatialReference.create(4326);

SpatialReference sr102100 = SpatialReference.create(102100);

Point point=(Point)graphic.getGeometry();Point geometry=(Point)GeometryEngine.project(graphic.getGeometry(),sr102100, sr4326);Geometry geometry1=GeometryEngine.project(b,graphic.getSpatialReference(), sr4326);Point mapPoint = (Point) GeometryEngine.project(b, graphic.getSpatialReference(), sr4326);