Feature layer selection

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/* Copyright 2016 ESRI
 *
 * All rights reserved under the copyright laws of the United States
 * and applicable international laws, treaties, and conventions.
 *
 * You may freely redistribute and use this sample code, with or
 * without modification, provided you include the original copyright
 * notice and use restrictions.
 *
 * See the Sample code usage restrictions document for further information.
 *
 */

package com.esri.arcgisruntime.sample.featurelayerselection;

import android.graphics.Color;
import android.graphics.Point;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.Toast;

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.geometry.SpatialReferences;
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.DefaultMapViewOnTouchListener;
import com.esri.arcgisruntime.mapping.view.IdentifyLayerResult;
import com.esri.arcgisruntime.mapping.view.MapView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

  private static final String TAG = MainActivity.class.getSimpleName();

  private MapView mMapView;

  @Override
  protected void onCreate(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 reference to map view
    mMapView = findViewById(R.id.mapView);
    mMapView.getSelectionProperties().setColor(Color.RED);

    // create a map with the streets basemap
    final ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_STREETS);

    // set the map to be displayed in the MapView
    mMapView.setMap(map);

    // set an initial viewpoint
    mMapView.setViewpoint(
        new Viewpoint(new Envelope(-1131596.019761, 3893114.069099, 3926705.982140, 7977912.461790,
            SpatialReferences.getWebMercator())));

    // create service feature table and a feature layer from it
    final ServiceFeatureTable serviceFeatureTable = new ServiceFeatureTable(
        getString(R.string.gdp_per_capita_url));
    final FeatureLayer featureLayer = new FeatureLayer(serviceFeatureTable);

    // 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) {
      @Override
      public boolean onSingleTapConfirmed(MotionEvent motionEvent) {
        featureLayer.clearSelection();
        Point screenPoint = new Point(Math.round(motionEvent.getX()),
            Math.round(motionEvent.getY()));
        int tolerance = 10;

        ListenableFuture<IdentifyLayerResult> identifyLayerResultFuture = mMapView
            .identifyLayerAsync(featureLayer, screenPoint, tolerance, false, -1);
        identifyLayerResultFuture.addDoneListener(() -> {
          try {
            // get the result from the identify
            IdentifyLayerResult identifyLayerResult = identifyLayerResultFuture.get();

            // create a list of features from the elements of the identify layer result
            List<Feature> identifiedFeatures = new ArrayList<>();
            for (GeoElement geoelement : identifyLayerResult.getElements()) {
              if (geoelement instanceof Feature) {
                identifiedFeatures.add((Feature) geoelement);
              }
            }

            // select the features in the feature layer
            featureLayer.selectFeatures(identifiedFeatures);

            Toast.makeText(MainActivity.this, identifiedFeatures.size() + " features selected",
                Toast.LENGTH_SHORT).show();
          } catch (Exception e) {
            String error = "Select features failed: " + e.getMessage();
            Toast.makeText(MainActivity.this, error, Toast.LENGTH_SHORT).show();
            Log.e(TAG, error);
          }
        });

        return true;
      }
    });
  }

  @Override
  protected void onPause() {
    mMapView.pause();
    super.onPause();
  }

  @Override
  protected void onResume() {
    super.onResume();
    mMapView.resume();
  }

  @Override
  protected void onDestroy() {
    mMapView.dispose();
    super.onDestroy();
  }
}