Feature layer selection

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/*
 * Copyright 2020 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.featurelayerselection

import android.graphics.Color
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.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.Viewpoint
import com.esri.arcgisruntime.mapping.view.DefaultMapViewOnTouchListener
import com.esri.arcgisruntime.mapping.view.MapView
import com.esri.arcgisruntime.sample.featurelayerselection.databinding.ActivityMainBinding
import kotlin.math.roundToInt

class MainActivity : AppCompatActivity() {

    private val TAG: String = MainActivity::class.java.simpleName

    private val activityMainBinding by lazy {
        ActivityMainBinding.inflate(layoutInflater)
    }

    private val mapView: MapView by lazy {
        activityMainBinding.mapView
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(activityMainBinding.root)

        // authentication with an API key or named user is required to access basemaps and other
        // location services
        ArcGISRuntimeEnvironment.setApiKey(BuildConfig.API_KEY)

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

        // create a map with the streets base map type
        val streetsMap = ArcGISMap(BasemapStyle.ARCGIS_STREETS).apply {
            // add the feature layer to the map's operational layers
            operationalLayers.add(featureLayer)
        }

        mapView.let {
            // set the map to be displayed in the layout's map view
            it.map = streetsMap
            // set an initial view point
            it.setViewpoint(
                Viewpoint(
                    Envelope(
                        -1131596.019761,
                        3893114.069099,
                        3926705.982140,
                        7977912.461790,
                        SpatialReferences.getWebMercator()
                    )
                )
            )
            // give any item selected on the map view a red selection halo
            it.selectionProperties.color = Color.RED
            // set an on touch listener on the map view
            it.onTouchListener = object : DefaultMapViewOnTouchListener(this, it) {
                override fun onSingleTapConfirmed(motionEvent: MotionEvent): Boolean {
                    // clear the previous selection
                    featureLayer.clearSelection()
                    // get the point that was tapped and convert it to a point in map coordinates
                    val tappedPoint =
                        android.graphics.Point(
                            motionEvent.x.roundToInt(),
                            motionEvent.y.roundToInt()
                        )
                    // set a tolerance for accuracy of returned selections from point tapped
                    val tolerance = 25.0

                    val identifyLayerResultFuture =
                        mapView.identifyLayerAsync(featureLayer, tappedPoint, tolerance, false, -1)
                    identifyLayerResultFuture.addDoneListener {
                        try {
                            val identifyLayerResult = identifyLayerResultFuture.get()
                            // get the elements in the selection that are features
                            val features = identifyLayerResult.elements.filterIsInstance<Feature>()
                            // add the features to the current feature layer selection
                            featureLayer.selectFeatures(features)
                            // make a toast to show the number of features selected
                            Toast.makeText(
                                applicationContext,
                                "${features.size} features selected",
                                Toast.LENGTH_SHORT
                            ).show()
                        } catch (e: Exception) {
                            val errorMessage = "Select feature failed: " + e.message
                            Log.e(TAG, errorMessage)
                            Toast.makeText(applicationContext, errorMessage, Toast.LENGTH_LONG)
                                .show()
                        }
                    }
                    return super.onSingleTapConfirmed(motionEvent)
                }
            }
        }
    }

    override fun onResume() {
        super.onResume()
        mapView.resume()
    }

    override fun onPause() {
        mapView.pause()
        super.onPause()
    }

    override fun onDestroy() {
        mapView.dispose()
        super.onDestroy()
    }
}