Return all loaded features from a query to show all attributes.
Use case
Attributes can be used to help describe the objects represented by a feature. A geologist might use an attribute to describe the rock type of polygons representing surface geology. Archaeologists might use attributes to record the stratigraphic layer of finds represented as point features.
How to use the sample
Tap on a feature to see its attributes in a callout.
How it works
Create an instance of a ServiceFeatureTable.
Identify selected features with mMapView.identifyLayerAsync(...) and pass in the feature layer and tapped location to get all of the attributes for the feature at that location.
Get the IdentifyLayerResult and iterate through the results to display each attribute in a callout.
Relevant API
Feature
FeatureLayer
FeatureQueryResult
ServiceFeatureTable
Tags
features, layers, query, attributes
Sample Code
MainActivity.java
/*
* Copyright 2016 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.featurelayershowattributes;
import java.text.SimpleDateFormat;
import java.util.GregorianCalendar;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import android.graphics.Color;
import android.graphics.Point;
import android.os.Bundle;
import android.text.method.ScrollingMovementMethod;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.concurrent.ListenableFuture;
import com.esri.arcgisruntime.data.Feature;
import com.esri.arcgisruntime.data.ServiceFeatureTable;
import com.esri.arcgisruntime.geometry.Envelope;
import com.esri.arcgisruntime.layers.FeatureLayer;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.GeoElement;
import com.esri.arcgisruntime.mapping.Viewpoint;
import com.esri.arcgisruntime.mapping.view.Callout;
import com.esri.arcgisruntime.mapping.view.DefaultMapViewOnTouchListener;
import com.esri.arcgisruntime.mapping.view.IdentifyLayerResult;
import com.esri.arcgisruntime.mapping.view.MapView;
publicclassMainActivityextendsAppCompatActivity{
private MapView mMapView;
private Callout mCallout;
private ServiceFeatureTable mServiceFeatureTable;
@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);
// inflate MapView from layout mMapView = findViewById(R.id.mapView);
// create an ArcGISMap with a topographic basemapfinal ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
// set the ArcGISMap to the MapView mMapView.setMap(map);
// set a viewpoint mMapView.setViewpoint(new Viewpoint(34.057386, -117.191455, 100000000));
// get the callout that shows attributes mCallout = mMapView.getCallout();
// create the service feature table mServiceFeatureTable = new ServiceFeatureTable(getResources().getString(R.string.sample_service_url));
// create the feature layer using the service feature tablefinal FeatureLayer featureLayer = new FeatureLayer(mServiceFeatureTable);
// add the layer to the map map.getOperationalLayers().add(featureLayer);
// set an on touch listener to listen for click events mMapView.setOnTouchListener(new DefaultMapViewOnTouchListener(this, mMapView) {
@OverridepublicbooleanonSingleTapConfirmed(MotionEvent e){
// remove any existing calloutsif (mCallout.isShowing()) {
mCallout.dismiss();
}
// get the point that was clicked and convert it to a point in map coordinatesfinal Point screenPoint = new Point(Math.round(e.getX()), Math.round(e.getY()));
// create a selection toleranceint tolerance = 10;
// use identifyLayerAsync to get tapped featuresfinal ListenableFuture<IdentifyLayerResult> identifyLayerResultListenableFuture = mMapView
.identifyLayerAsync(featureLayer, screenPoint, tolerance, false, 1);
identifyLayerResultListenableFuture.addDoneListener(() -> {
try {
IdentifyLayerResult identifyLayerResult = identifyLayerResultListenableFuture.get();
// create a textview to display field values TextView calloutContent = new TextView(getApplicationContext());
calloutContent.setTextColor(Color.BLACK);
calloutContent.setSingleLine(false);
calloutContent.setVerticalScrollBarEnabled(true);
calloutContent.setScrollBarStyle(View.SCROLLBARS_INSIDE_INSET);
calloutContent.setMovementMethod(new ScrollingMovementMethod());
calloutContent.setLines(5);
for (GeoElement element : identifyLayerResult.getElements()) {
Feature feature = (Feature) element;
// create a map of all available attributes as name value pairs Map<String, Object> attr = feature.getAttributes();
Set<String> keys = attr.keySet();
for (String key : keys) {
Object value = attr.get(key);
// format observed field value as dateif (value instanceof GregorianCalendar) {
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd-MMM-yyyy", Locale.US);
value = simpleDateFormat.format(((GregorianCalendar) value).getTime());
}
// append name value pairs to text view calloutContent.append(key + " | " + value + "\n");
}
// center the mapview on selected feature Envelope envelope = feature.getGeometry().getExtent();
mMapView.setViewpointGeometryAsync(envelope, 200);
// show callout mCallout.setLocation(envelope.getCenter());
mCallout.setContent(calloutContent);
mCallout.show();
}
} catch (Exception e1) {
Log.e(getResources().getString(R.string.app_name), "Select feature failed: " + e1.getMessage());
}
});
returnsuper.onSingleTapConfirmed(e);
}
});
}
@OverrideprotectedvoidonPause(){
super.onPause();
mMapView.pause();
}
@OverrideprotectedvoidonResume(){
super.onResume();
mMapView.resume();
}
@OverrideprotectedvoidonDestroy(){
super.onDestroy();
mMapView.dispose();
}
}