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. The ArcGIS Maps SDKs for Native Apps 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 to 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
NavigationChangedEvent
QueryParameters
WfsFeatureTable
About the data
This service shows building footprints for downtown Seattle. For additional information, see the underlying service on ArcGIS Online.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
/*
* 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.samples.display_wfs_layer;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
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;
publicclassDisplayWFSLayerSampleextendsApplication{
private MapView mapView;
@Overridepublicvoidstart(Stage stage){
// create stack pane and JavaFX app scene StackPane stackPane = new StackPane();
Scene scene = new Scene(stackPane);
// set title, size, and add JavaFX scene to stage stage.setTitle("Display a WFS Layer");
stage.setWidth(800);
stage.setHeight(700);
stage.setScene(scene);
stage.show();
// authentication with an API key or named user is required to access basemaps and other location services String yourAPIKey = System.getProperty("apiKey");
ArcGISRuntimeEnvironment.setApiKey(yourAPIKey);
// create a map with the topographic basemap style ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
// create a map view and set the map to it mapView = new MapView();
mapView.setMap(map);
// create an initial extent to load Point topLeft = new Point(-13619002.499764, 6043406.351867);
Point bottomRight = new Point(-13618454.919189, 6042836.793464);
Envelope initialExtent = new Envelope(topLeft, bottomRight);
mapView.setViewpoint(new Viewpoint(initialExtent));
String serviceUrl = "https://dservices2.arcgis.com/ZQgQTuoyBrtmoGdP/arcgis/services/Seattle_Downtown_Features/WFSServer?service=wfs&request=getcapabilities";
String LayerName = "Seattle_Downtown_Features:Buildings";
// create a FeatureTable from the WFS service URL and name of the layer WfsFeatureTable wfsFeatureTable = new WfsFeatureTable(serviceUrl, LayerName);
// set the feature request mode to manual. The table must be manually populated as 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 populateFeaturesFromServer(wfsFeatureTable, initialExtent);
// use the navigation property listener to populate the table with the features needed for the current extent mapView.navigatingProperty().addListener((observable, oldValue, newValue) -> {
// once the map view has stopped navigatingif (!newValue) {
populateFeaturesFromServer(wfsFeatureTable, mapView.getVisibleArea().getExtent());
}
});
// add the mapview to the stackpane stackPane.getChildren().add(mapView);
}
/**
* Create query parameters using the given extent to populate the WFS table from the service
* @param wfsTable the WFS feature table to populate
* @param extent the extent used to define the QueryParameters' geometry
*/privatevoidpopulateFeaturesFromServer(WfsFeatureTable wfsTable, 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 wfsTable.populateFromServiceAsync(visibleExtentQuery, false, null);
}
/**
* Stops and releases all resources used in application.
*/@Overridepublicvoidstop(){
if (mapView != null) {
mapView.dispose();
}
}
/**
* Opens and runs application.
*
* @param args arguments passed to this application
*/publicstaticvoidmain(String[] args){
Application.launch(args);
}
}