Display KML from a URL, portal item, or local KML file.
Use case
Keyhole Markup Language (KML) is a data format used by Google Earth. KML is popular as a transmission format for consumer use and for sharing geographic data between apps. You can use Runtime to display KML files, with full support for a variety of features, including network links, 3D models, screen overlays, and tours.
How to use the sample
Use the overflow menu to select a source. A KML file from that source will be loaded and displayed in the map.
How it works
To create a KML layer from a URL, create a KmlDataset using the URL to the KML file. Then pass the dataset to the KmlLayer constructor.
To create a KML layer from a portal item, construct a PortalItem with a Portal and the KML portal item ID. Pass the portal item to the KmlLayer constructor.
To create a KML layer from a local file, create a KmlDataset using the absolute file path to the local KML file. Then pass the dataset to the KmlLayer constructor.
Add the layer as an operational layer to the map with map.getOperationalLayers().add(kmlLayer).
From URL - this is a map of the significant weather outlook produced by NOAA/NWS. It uses KML network links to always show the latest data.
From local file - this is a map of U.S. state capitals. It doesn't define an icon, so the default pushpin is used for the points.
From portal item - this is a map of U.S. states.
Tags
keyhole, KML, KMZ, OGC
Sample Code
MainActivity.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.arcgisruntime.sample.displaykml;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.layers.KmlLayer;
import com.esri.arcgisruntime.loadable.LoadStatus;
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.kml.KmlDataset;
import com.esri.arcgisruntime.portal.Portal;
import com.esri.arcgisruntime.portal.PortalItem;
publicclassMainActivityextendsAppCompatActivity{
privatestaticfinal String TAG = MainActivity.class.getSimpleName();
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);
// get the reference to the map view mMapView = findViewById(R.id.mapView);
// create a map with the dark gray canvas basemap ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_DARK_GRAY);
// set the map to the map view mMapView.setMap(map);
mMapView.setViewpoint(new Viewpoint(39, -98, 100000000));
// set the initial source to a KML layer from a URL changeSourceToURL();
}
/**
* Clear all operational layers and add the kml layer to the map as an operational layer.
*
* @param kmlLayer to add to the map
*/privatevoiddisplay(KmlLayer kmlLayer){
// clear the existing layers from the map mMapView.getMap().getOperationalLayers().clear();
// add the KML layer to the map mMapView.getMap().getOperationalLayers().add(kmlLayer);
}
/**
* Display a kml layer from a URL.
*/privatevoidchangeSourceToURL(){
// create a kml data set from a URL KmlDataset kmlDataset = new KmlDataset(getString(R.string.noaa_weather_kml_url));
// a KML layer created from a remote KML file KmlLayer kmlLayer = new KmlLayer(kmlDataset);
display(kmlLayer);
// report errors if failed to load kmlDataset.addDoneLoadingListener(() -> {
if (kmlDataset.getLoadStatus() != LoadStatus.LOADED) {
String error = "Failed to load kml layer from URL: " + kmlDataset.getLoadError().getMessage();
Toast.makeText(this, error, Toast.LENGTH_LONG).show();
Log.e(TAG, error);
}
});
}
/**
* Display a kml layer from a portal item.
*/privatevoidchangeSourceToPortalItem(){
// create a portal to ArcGIS Online Portal portal = new Portal(getString(R.string.arcgis_online_url));
// create a portal item from a kml item id PortalItem portalItem = new PortalItem(portal, getString(R.string.kml_item_id));
// a KML layer created from an ArcGIS Online portal item KmlLayer kmlLayer = new KmlLayer(portalItem);
display(kmlLayer);
// report errors if failed to load kmlLayer.addDoneLoadingListener(() -> {
if (kmlLayer.getLoadStatus() != LoadStatus.LOADED) {
String error = "Failed to load kml layer from portal item: " + kmlLayer.getLoadError().getCause().getMessage();
Toast.makeText(this, error, Toast.LENGTH_LONG).show();
Log.e(TAG, error);
}
});
}
/**
* Display a kml layer from external storage.
*/privatevoidchangeSourceToFileExternalStorage(){
// a data set made from data in external storage KmlDataset kmlDataset = new KmlDataset(getExternalFilesDir(null) + getString(R.string.kml_path));
// a KML layer created from a local KML file KmlLayer kmlLayer = new KmlLayer(kmlDataset);
display(kmlLayer);
// report errors if failed to load kmlDataset.addDoneLoadingListener(() -> {
if (kmlDataset.getLoadStatus() != LoadStatus.LOADED) {
String error =
"Failed to load kml data set from external storage: " + kmlDataset.getLoadError().getCause().getMessage();
Toast.makeText(this, error, Toast.LENGTH_LONG).show();
Log.e(TAG, error);
}
});
}
@OverridepublicbooleanonCreateOptionsMenu(Menu menu){
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.kml_sources, menu);
returnsuper.onCreateOptionsMenu(menu);
}
@OverridepublicbooleanonOptionsItemSelected(MenuItem item){
int i = item.getItemId();
if (i == R.id.kmlFromUrl) {
changeSourceToURL();
} elseif (i == R.id.kmlFromPortal) {
changeSourceToPortalItem();
} elseif (i == R.id.kmlFromExternalStorage) {
changeSourceToFileExternalStorage();
} else {
Log.e(TAG, "Menu option not implemented");
}
returnsuper.onOptionsItemSelected(item);
}
@OverrideprotectedvoidonPause(){
mMapView.pause();
super.onPause();
}
@OverrideprotectedvoidonResume(){
super.onResume();
mMapView.resume();
}
@OverrideprotectedvoidonDestroy(){
mMapView.dispose();
super.onDestroy();
}
}