Display a layer from a WFS service, requesting only features for the current extent.
Use case
WFS is an open standard with functionality similar to ArcGIS feature services. Runtime support for WFS allows you to interoperate with open systems, which are often used in inter-agency efforts, like those for disaster relief.
How to use the sample
Pan and zoom to see features within the current map extent.
How it works
Create a WfsFeatureTable with a URL.
Create a FeatureLayer from the feature table and add it to the map.
Add a NavigationChangedListener to the map view and listen for a NavigationChangedEvent. Check if it isNavigating() to detect when the user has stopped navigating the map.
When the user is finished navigating, use populateFromServiceAsync(...) to load the table with data for the current visible extent.
Relevant API
FeatureLayer
WfsFeatureTable
WfsFeatureTable.populateFromServiceAsync
About the data
This service shows building footprints for downtown Seattle. For additional information, see the underlying service on ArcGIS Online.
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/*
* Copyright 2019 Esri
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/package com.esri.arcgisruntime.sample.displaywfslayer;
import android.graphics.Color;
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.data.QueryParameters;
import com.esri.arcgisruntime.data.ServiceFeatureTable;
import com.esri.arcgisruntime.geometry.Envelope;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.layers.FeatureLayer;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.Viewpoint;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.ogc.wfs.WfsFeatureTable;
import com.esri.arcgisruntime.symbology.SimpleLineSymbol;
import com.esri.arcgisruntime.symbology.SimpleRenderer;
publicclassMainActivityextendsAppCompatActivity{
private MapView mMapView;
@OverrideprotectedvoidonCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// authentication with an API key or named user is required to access basemaps and other// location services ArcGISRuntimeEnvironment.setApiKey(BuildConfig.API_KEY);
mMapView = findViewById(R.id.mapView);
// create a map with topographic basemap and set it to the map view ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
mMapView.setMap(map);
// create an initial extent to load Point topLeft = new Point(-13618106.950944, 6042391.201455);
Point bottomRight = new Point(-13617513.444292, 6041961.243171);
Envelope initialExtent = new Envelope(topLeft, bottomRight);
mMapView.setViewpoint(new Viewpoint(initialExtent));
// create a FeatureTable from the WFS service URL and name of the layer WfsFeatureTable wfsFeatureTable = new WfsFeatureTable(getString(R.string.wfs_service_url),
getString(R.string.seattle_downtown_table));
// set the feature request mode to manual in this mode, you must manually populate the table - panning and zooming// won't request features automatically wfsFeatureTable.setFeatureRequestMode(ServiceFeatureTable.FeatureRequestMode.MANUAL_CACHE);
// create a feature layer to visualize the WFS features FeatureLayer wfsFeatureLayer = new FeatureLayer(wfsFeatureTable);
// apply a renderer to the feature layer SimpleRenderer renderer = new SimpleRenderer(new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.RED, 3));
wfsFeatureLayer.setRenderer(renderer);
// add the layer to the map's operational layers map.getOperationalLayers().add(wfsFeatureLayer);
// make an initial call to load the initial extent's data from the WFS, using the WFS spatial reference populateFromServer(wfsFeatureTable, initialExtent);
// use the navigation completed event to populate the table with the features needed for the current extent mMapView.addNavigationChangedListener(navigationChangedEvent -> {
// once the map view has stopped navigatingif (!navigationChangedEvent.isNavigating()) {
populateFromServer(wfsFeatureTable, mMapView.getVisibleArea().getExtent());
}
});
}
/**
* Create query parameters using the given extent to populate the WFS table from service.
*
* @param wfsFeatureTable the WFS feature table to populate
* @param extent the extent used to define the QueryParameters' geometry
*/privatevoidpopulateFromServer(WfsFeatureTable wfsFeatureTable, Envelope extent){
// create a query based on the current visible extent QueryParameters visibleExtentQuery = new QueryParameters();
visibleExtentQuery.setGeometry(extent);
visibleExtentQuery.setSpatialRelationship(QueryParameters.SpatialRelationship.INTERSECTS);
// populate the WFS feature table based on the current extent wfsFeatureTable.populateFromServiceAsync(visibleExtentQuery, false, null);
}
@OverrideprotectedvoidonPause(){
mMapView.pause();
super.onPause();
}
@OverrideprotectedvoidonResume(){
super.onResume();
mMapView.resume();
}
@OverrideprotectedvoidonDestroy(){
mMapView.dispose();
super.onDestroy();
}
}