Display OGC API collection

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/* Copyright 2021 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.displayogcapicollection

import android.graphics.Color
import android.os.Bundle
import android.util.Log
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment
import com.esri.arcgisruntime.data.OgcFeatureCollectionTable
import com.esri.arcgisruntime.data.QueryParameters
import com.esri.arcgisruntime.data.ServiceFeatureTable
import com.esri.arcgisruntime.geometry.Envelope
import com.esri.arcgisruntime.layers.FeatureLayer
import com.esri.arcgisruntime.loadable.LoadStatus
import com.esri.arcgisruntime.mapping.ArcGISMap
import com.esri.arcgisruntime.mapping.BasemapStyle
import com.esri.arcgisruntime.mapping.view.MapView
import com.esri.arcgisruntime.sample.displayogcapicollection.databinding.ActivityMainBinding
import com.esri.arcgisruntime.symbology.SimpleLineSymbol
import com.esri.arcgisruntime.symbology.SimpleRenderer

class MainActivity : AppCompatActivity() {

    // define strings for the service URL and collection id
    // note that the service defines the collection id which can be accessed
    // via OgcFeatureCollectionInfo.getCollectionId()
    private val serviceUrl = "https://demo.ldproxy.net/daraa"
    private val collectionId = "TransportationGroundCrv"

    // create an OGC feature collection table from the service url and collection id
    // keep loadable in scope to avoid garbage collection
    private var ogcFeatureCollectionTable: OgcFeatureCollectionTable =
        OgcFeatureCollectionTable(serviceUrl, collectionId)

    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 a map with the BasemapStyle topographic
        val map = ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC)

        // set the map to be displayed in the layout's MapView
        mapView.map = map

        // set the feature request mode to manual (only manual is currently supported).
        // in this mode, the table must be manually populated - panning and zooming won't request features automatically
        ogcFeatureCollectionTable.featureRequestMode =
            ServiceFeatureTable.FeatureRequestMode.MANUAL_CACHE

        // load the table
        ogcFeatureCollectionTable.loadAsync()

        // ensure the feature collection table has loaded successfully before creating a feature layer from it to display on the map
        ogcFeatureCollectionTable.addDoneLoadingListener {

            if (ogcFeatureCollectionTable.loadStatus == LoadStatus.LOADED) {

                // create a feature layer and set a renderer to it to visualize the OGC API features
                val featureLayer = FeatureLayer(ogcFeatureCollectionTable)
                val simpleRenderer =
                    SimpleRenderer(SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.BLUE, 3F))
                featureLayer.renderer = simpleRenderer

                // add the layer to the map
                map.operationalLayers.add(featureLayer)

                // zoom to a small area within the dataset by default
                val datasetExtent = ogcFeatureCollectionTable.extent
                if (datasetExtent != null && !datasetExtent.isEmpty) {
                    mapView.setViewpointGeometryAsync(
                        Envelope(
                            datasetExtent.center,
                            datasetExtent.width / 3,
                            datasetExtent.height / 3
                        )
                    )
                }
            } else {
                // show an alert if there is a loading failure
                Log.e(
                    ogcFeatureCollectionTable.loadError.message,
                    ogcFeatureCollectionTable.loadError.additionalMessage
                )
                Toast.makeText(
                    applicationContext,
                    "Failed to load OGC Feature Collection Table",
                    Toast.LENGTH_SHORT
                ).show()
            }
        }

        // once the map view navigation has completed, query the OGC API feature table for
        // additional features within the new visible extent
        mapView.addNavigationChangedListener {
            if (!it.isNavigating) {

                // get the current extent
                val currentExtent = mapView.visibleArea.extent

                // create a query based on the current visible extent
                val visibleExtentQuery = QueryParameters().apply {
                    geometry = currentExtent
                    spatialRelationship =
                        QueryParameters.SpatialRelationship.INTERSECTS
                    // set a limit of 5000 on the number of returned features per request, the default on some services
                    // could be as low as 10
                    maxFeatures = 5000
                }
                visibleExtentQuery.maxFeatures = 5000

                try {
                    // populate the table with the query, leaving existing table entries intact
                    // setting the outfields parameter to null requests all fields
                    ogcFeatureCollectionTable.populateFromServiceAsync(
                        visibleExtentQuery,
                        false,
                        null
                    )
                } catch (e: Exception) {
                    Toast.makeText(
                        applicationContext,
                        "Error populating from service: " + e.message,
                        Toast.LENGTH_SHORT
                    ).show()
                }
            }
        }
    }

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

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

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