嗨,
我是开发ArcGIS地图的新手。目前,我可以显示地图。但是如何使用经度和纬度创建默认位置并在我的代码中实现呢?
例如,我想设置这些坐标:(1.3002,103.8641)。当您打开地图时,它会自动放大到这些坐标。
提前谢谢。
这是我的代码:
public class HelloWorld extends Activity {
MapView mMapView = null;
ArcGISTiledMapServiceLayer tileLayer;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Retrieve the map and initial extent from XML layout
mMapView = (MapView)findViewById(R.id.map);
/* create a @ArcGISTiledMapServiceLayer */
tileLayer = new ArcGISTiledMapServiceLayer(
"http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer");
// Add tiled layer to MapView
mMapView.addLayer(tileLayer);
}
@Override
protected void onPause() {
super.onPause();
mMapView.pause();
}
@Override
protected void onResume() {
super.onResume();
mMapView.unpause();
}
}
答案 0 :(得分:0)
在向MapView
添加任何图层之前,请设置其OnStatusChangedListener
。在地图坐标处向projects the longitude/latitude coordinates to map coordinates和centers the map的监听器添加代码。
你可以这样做:
mMapView = (MapView)findViewById(R.id.map);
final double longitude = 103.8641;
final double latitude = 1.3002;
mMapView.setOnStatusChangedListener(new OnStatusChangedListener() {
@Override
public void onStatusChanged(Object source, STATUS status) {
if (STATUS.INITIALIZED.equals(status)) {
Point mapPoint = GeometryEngine.project(longitude, latitude, mMapView.getSpatialReference());
mMapView.centerAt(mapPoint, false);
}
}
});
/* create a @ArcGISTiledMapServiceLayer */
tileLayer = new ArcGISTiledMapServiceLayer(
"http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer");
// Add tiled layer to MapView
mMapView.addLayer(tileLayer);
如果您想要居中和缩放到一定比例,可以拨打zoomToScale
而不是centerAt
。