KML files can contain a hierarchy of features, including network links to other KML content. A user may wish to traverse through the contents of KML nodes to know what data is contained within each node and, recursively, their children.
How to use the sample
The contents of the KML file are shown in a tree. Select a node to zoom to that node. Not all nodes can be zoomed to (e.g. screen overlays).
How it works
Add the KML file to the scene as a layer.
Explore the root nodes of the KmlDataset recursively explored to create a view model.
Each node is enabled for display at this step. KML files may include nodes that are turned off by default.
When a node is selected, get its extent with selectedNode.getExtent(). Use that to create a Viewpoint and set the SceneView object's viewpoint to it.
Relevant API
KmlContainer
KmlDataset
KmlDocument
KmlFolder
KmlGroundOverlay
KmlLayer
KmlNetworkLink
KmlNode
KmlPlacemark
KmlScreenOverlay
Tags
Keyhole, KML, KMZ, layers, OGC
Sample Code
ListKMLContentsSample.java
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/*
* Copyright 2018 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.list_kml_contents;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.control.cell.TextFieldTreeCell;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import javafx.util.StringConverter;
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.geometry.Envelope;
import com.esri.arcgisruntime.layers.KmlLayer;
import com.esri.arcgisruntime.mapping.ArcGISScene;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.Viewpoint;
import com.esri.arcgisruntime.mapping.view.SceneView;
import com.esri.arcgisruntime.ogc.kml.KmlContainer;
import com.esri.arcgisruntime.ogc.kml.KmlDataset;
import com.esri.arcgisruntime.ogc.kml.KmlDocument;
import com.esri.arcgisruntime.ogc.kml.KmlFolder;
import com.esri.arcgisruntime.ogc.kml.KmlGroundOverlay;
import com.esri.arcgisruntime.ogc.kml.KmlNetworkLink;
import com.esri.arcgisruntime.ogc.kml.KmlNode;
import com.esri.arcgisruntime.ogc.kml.KmlPlacemark;
import com.esri.arcgisruntime.ogc.kml.KmlScreenOverlay;
publicclassListKMLContentsSampleextendsApplication{
private SceneView sceneView;
@Overridepublicvoidstart(Stage stage){
try {
// create stack pane and application scene StackPane stackPane = new StackPane();
Scene fxScene = new Scene(stackPane);
// set title, size, and add scene to stage stage.setTitle("List KML Contents Sample");
stage.setWidth(800);
stage.setHeight(700);
stage.setScene(fxScene);
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 scene add it to the scene view ArcGISScene scene = new ArcGISScene(BasemapStyle.ARCGIS_IMAGERY);
sceneView = new SceneView();
sceneView.setArcGISScene(scene);
// load a KML dataset from a local KMZ file and show it as an operational layer File kmzFile = new File(System.getProperty("data.dir"), "./samples-data/kml/esri_test_data.kmz");
KmlDataset kmlDataset = new KmlDataset(kmzFile.getAbsolutePath());
KmlLayer kmlLayer = new KmlLayer(kmlDataset);
scene.getOperationalLayers().add(kmlLayer);
// create a tree view to list the contents of the KML dataset TreeView<KmlNode> kmlTree = new TreeView<>();
kmlTree.setMaxSize(300, 400);
TreeItem<KmlNode> root = new TreeItem<>(null);
kmlTree.setRoot(root);
kmlTree.setShowRoot(false);
// when the dataset is loaded, recursively build the tree view with KML nodes starting with the root node(s) kmlDataset.addDoneLoadingListener(() -> kmlDataset.getRootNodes().forEach(kmlNode -> {
TreeItem<KmlNode> kmlNodeTreeItem = buildTree(new TreeItem<>(kmlNode));
root.getChildren().add(kmlNodeTreeItem);
}));
// show the KML node in the tree view with its name and type kmlTree.setCellFactory(param -> new TextFieldTreeCell<>(new StringConverter<KmlNode>() {
@Overridepublic String toString(KmlNode node){
String type = null;
if (node instanceof KmlDocument) {
type = "KmlDocument";
} elseif (node instanceof KmlFolder) {
type = "KmlFolder";
} elseif (node instanceof KmlGroundOverlay) {
type = "KmlGroundOverlay";
} elseif (node instanceof KmlScreenOverlay) {
type = "KmlScreenOverlay";
} elseif (node instanceof KmlPlacemark) {
type = "KmlPlacemark";
}
return node.getName() + " - " + type;
}
@Overridepublic KmlNode fromString(String string){
returnnull; //not needed }
}));
// when a tree item is selected, zoom to its node's extent (if it has one) kmlTree.getSelectionModel().selectedItemProperty().addListener(o -> {
TreeItem<KmlNode> selectedTreeItem = kmlTree.getSelectionModel().getSelectedItem();
KmlNode selectedNode = selectedTreeItem.getValue();
Envelope nodeExtent = selectedNode.getExtent();
if (nodeExtent != null && !nodeExtent.isEmpty()) {
sceneView.setViewpointAsync(new Viewpoint(nodeExtent));
}
});
// add the map view to stack pane stackPane.getChildren().addAll(sceneView, kmlTree);
StackPane.setAlignment(kmlTree, Pos.TOP_LEFT);
StackPane.setMargin(kmlTree, new Insets(10));
} catch (Exception e) {
// on any error, display the stack trace. e.printStackTrace();
}
}
/**
* Recursively adds child tree items to the given parent tree item based on its node's child nodes.
*
* @param parent a parent KML node tree item
* @return the original parent, now with the child tree attached to it
*/private TreeItem<KmlNode> buildTree(TreeItem<KmlNode> parent){
KmlNode node = parent.getValue();
node.setVisible(true);
List<KmlNode> children = new ArrayList<>();
if (parent.getValue() instanceof KmlContainer) {
children.addAll(((KmlContainer) node).getChildNodes());
} elseif (parent.getValue() instanceof KmlNetworkLink) {
children.addAll(((KmlNetworkLink) node).getChildNodes());
}
children.forEach(childNode -> {
TreeItem<KmlNode> childTreeItem = buildTree(new TreeItem<>(childNode));
parent.getChildren().add(childTreeItem);
});
parent.setExpanded(true); // expand all nodes in the tree viewreturn parent;
}
/**
* Stops and releases all resources used in application.
*/@Overridepublicvoidstop(){
if (sceneView != null) {
sceneView.dispose();
}
}
/**
* Opens and runs application.
*
* @param args arguments passed to this application
*/publicstaticvoidmain(String[] args){
Application.launch(args);
}
}