Android GIS开发系列-- 入门季（15） 网络图层加载
一、首先我们来看一个网络图层： http://services.arcgisonline.com/arcgis/rest/services/World_Street_Map/MapServer，这是全球街道图。加载的代码也很简单： private static final String WORLD_STREETS_URL = "http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer"; private MapView mMapView = null; private ArcGISTiledMapServiceLayer mWorldStreetsLayer = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mMapView = (MapView) findViewById(R.id.map_view); mWorldStreetsLayer = new ArcGISTiledMapServiceLayer(WORLD_STREETS_URL); mMapView.addLayer(mWorldStreetsLayer); mWorldStreetsLayer.setOnStatusChangedListener(new OnStatusChangedListener() { @Override public void onStatusChanged(Object o, STATUS status) { if (status==STATUS.INITIALIZED){ Log.i("huang","加载成功"); }else if(status==STATUS.INITIALIZATION_FAILED||status==STATUS.LAYER_LOADING_FAILED){ Log.i("huang","加载失败"); } } }); } 效果图 问：为什么用ArcGISTiledMapServiceLayer 加载而不用其他图层加载呢？ 用浏览器打开http://services.arcgisonline.com/arcgis/rest/services/World_Street_Map/MapServer，可以看到详细信息。 它的子图层只有一个： 下面是坐标信息，注意Single Fused Map Cache: true，支持缓存。 与Tile Info信息， 通过信息说明这是一个TiledLayer,而ArcGISTiledMapServiceLayer是TiledLayer子类的子类，看一下ArcGISTiledMapServiceLayer的介绍。 点开World Street Map链接，http://services.arcgisonline.com/arcgis/rest/services/World_Street_Map/MapServer/0，这是它的唯一子图层。真正加载的也是这个图层 Type虽然说是FeatureLayer，但它得用ArcGISFeatureLayer加载。 ArcGISFeatureLayer arcGISFeatureLayer = new ArcGISFeatureLayer(WORLD_STREETS_URL+"/0", ArcGISFeatureLayer.MODE.ONDEMAND); SimpleFillSymbol simpleFillSymbol = new SimpleFillSymbol(Color.argb(0,0,0,0),SimpleFillSymbol.STYLE.SOLID); mMapView.addLayer(arcGISFeatureLayer); arcGISFeatureLayer.setRenderer(new SimpleRenderer(simpleFillSymbol)); arcGISFeatureLayer.setOnStatusChangedListener(new OnStatusChangedListener() { @Override public void onStatusChanged(Object o, STATUS status) { if (status==STATUS.INITIALIZED){ Log.i("huang","加载成功"); }else if(status==STATUS.INITIALIZATION_FAILED||status==STATUS.LAYER_LOADING_FAILED){ Log.i("huang","加载失败"); } } }); 上面虽然加载成功，但并看不到图层，而且报错： FeatureSetCallback.onError com.esri.core.io.EsriServiceException: Requested operation is not supported by this service. The requested capability is not supported. 仔细再看网络信息， 大体上知道为什么报 The requested capability is not supported。也就是不能用这种方法加载，而得用前面的代码加载！！！ ArcGISDynamicMapServiceLayer 服务地址：http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StateCityHighway_USA/MapServer，这是美国的高铁图。 用浏览器打开，有三个子图层，Single Fused Map Cache: false！ 下面是ArcGISDynamicMapServiceLayer的介绍： 加载代码 ： private static final String DYNAMIC_USA_HIGHWAY_URL = "http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StateCityHighway_USA/MapServer"; private ArcGISDynamicMapServiceLayer usaHighwayLayer = null; private MapView mMapView = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mMapView = (MapView) findViewById(R.id.map_view); usaHighwayLayer = new ArcGISDynamicMapServiceLayer(DYNAMIC_USA_HIGHWAY_URL); mMapView.addLayer(usaHighwayLayer); usaHighwayLayer.setOnStatusChangedListener(new OnStatusChangedListener() { @Override public void onStatusChanged(Object o, STATUS status) { if (status==STATUS.INITIALIZED){ Log.i("huang","加载成功"); }else if(status==STATUS.INITIALIZATION_FAILED||status==STATUS.LAYER_LOADING_FAILED){ Log.i("huang","加载失败"); } } });} 效果图 二、ArcGISFeatureLayer加载图层 服务地图http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StateCityHighway_USA/MapServer/0，也就是上面服务的子图层。 ArcGISFeatureLayer arcGISFeatureLayer = new ArcGISFeatureLayer("http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StateCityHighway_USA/MapServer/0", ArcGISFeatureLayer.MODE.ONDEMAND); mMapView.addLayer(arcGISFeatureLayer); arcGISFeatureLayer.setRenderer(new SimpleRenderer(new SimpleLineSymbol(Color.argb(250, 52, 17, 255),2))); arcGISFeatureLayer.setOnStatusChangedListener(new OnStatusChangedListener() { @Override public void onStatusChanged(Object o, STATUS status) { if (status==STATUS.INITIALIZED){ Log.i("huang","加载成功"); }else if(status==STATUS.INITIALIZATION_FAILED||status==STATUS.LAYER_LOADING_FAILED){ Log.i("huang","加载失败"); } } }); 注意要设置setRenderer，效果 ArcGISFeatureLayer 具有FeatureLayer的一些查询方法，与前面几讲里FeatureLayer查询相似，这里不再讲了。 //查询要素方法 queryIds(Query query, CallbackListener<int[]> callback) queryFeatures(Query query, CallbackListener<FeatureSet> callback) 在http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StateCityHighway_USA/MapServer/0，页面底部， 点击Query进入查询要素界面，可直接 查询要素 where 1=1，点击Query(GET)，可得到以下结果集 没有整理与归纳的知识，一文不值！高度概括与梳理的知识，才是自己真正的知识与技能。 永远不要让自己的自由、好奇、充满创造力的想法被现实的框架所束缚，让创造力自由成长吧！ 多花时间，关心他（她）人，正如别人所关心你的。理想的腾飞与实现，没有别人的支持与帮助，是万万不能的。 本文转自wenglabs博客园博客，原文链接：http://www.cnblogs.com/arxive/p/7752063.html ，如需转载请自行联系原作者
