如何將標記添加到Android上的ArcGIS地圖？

Question

我想在Android應用程序的ArcGIS地圖上添加一個標記。但是，添加圖形圖層後，我的地圖不出現。我是Android應用程序編程新手，非常感謝任何幫助。我不確定我在這裏做錯了什麼。提前致謝。

這裏是我的代碼：

public class SuggestionsFragment extends Fragment { 
    MapView mMapView; 
    GraphicsLayer graphicsLayer = new GraphicsLayer(); 
    Point point; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    View rootView = inflater.inflate(R.layout.fragment_suggestions, 
      container, false); 

    //Retrieve the map and initial extent from XML layout 
    mMapView = (MapView)rootView.findViewById(R.id.map); 

    //Create the layer 
    final Layer oneMapLayer = new ArcGISTiledMapServiceLayer("http://e1.onemap.sg/arcgis/rest/services/BASEMAP/MapServer"); 

    mMapView.addLayer(graphicsLayer); 
    Point point = new Point(1.3799775, 103.84877200000005); 
    graphicsLayer.addGraphic(new Graphic(point,new SimpleMarkerSymbol(Color.RED,10,STYLE.CIRCLE))); 

    //Know when the map layer loaded 
    mMapView.setOnStatusChangedListener(new OnStatusChangedListener() { 
     private static final long serialVersionUID = 1L; 

     public void onStatusChanged(Object source, STATUS status) { 
      if (source == oneMapLayer && status == STATUS.LAYER_LOADED) { 

       mMapView.centerAt(1.3799775, 103.84877200000005, false); 
       mMapView.setScale(1500,false); 


      } 
     } 
    }); 



    //Add dynamic layer to MapView 
    mMapView.addLayer(oneMapLayer); 




    return rootView; 
} 

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

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

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

} 

Answer 1

解決辦法：

public class SuggestionsFragment2 extends Fragment { 
MapView mMapView; 
GraphicsLayer graphicsLayer = new GraphicsLayer(); 
Point point; 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 
    View rootView = inflater.inflate(R.layout.fragment_suggestions2, 
      container, false); 



    //Retrieve the map and initial extent from XML layout 
    mMapView = (MapView)rootView.findViewById(R.id.map); 

    //Create the layer 
    final Layer oneMapLayer = new ArcGISTiledMapServiceLayer("http://e1.onemap.sg/arcgis/rest/services/BASEMAP/MapServer"); 

    //Know when the map layer loaded 
    mMapView.setOnStatusChangedListener(new OnStatusChangedListener() { 
     private static final long serialVersionUID = 1L; 

     public void onStatusChanged(Object source, STATUS status) { 
      if (source == oneMapLayer && status == STATUS.LAYER_LOADED) { 

       mMapView.centerAt(1.3799775, 103.84877200000005, false); 
       mMapView.setScale(1500,false); 

       mMapView.addLayer(graphicsLayer); 
       Point point = GeometryEngine.project(x, y, mMapView.getSpatialReference()); 
       graphicsLayer.addGraphic(new Graphic(point,new SimpleMarkerSymbol(Color.RED,10,STYLE.CIRCLE))); 

      } 
     } 

    }); 

    //Add dynamic layer to MapView 
    mMapView.addLayer(oneMapLayer); 

    return rootView; 
} 

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

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

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