Feature layer (geodatabase)

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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.featurelayergeodatabase

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.Geodatabase
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.Viewpoint
import com.esri.arcgisruntime.mapping.view.MapView
import com.esri.arcgisruntime.sample.featurelayergeodatabase.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {
    private val TAG =
        MainActivity::class.java.simpleName

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

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

    // objects that implement Loadable must be class fields to prevent being garbage collected before loading
    private val geodatabase: Geodatabase by lazy {
        Geodatabase(getExternalFilesDir(null)?.path + getString(R.string.geodb_name))
    }

    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 map and add to map view
        val map = ArcGISMap(BasemapStyle.ARCGIS_STREETS)
        mapView.map = map

        geodatabase.loadAsync()
        geodatabase.addDoneLoadingListener {
            if (geodatabase.loadStatus == LoadStatus.LOADED) {
                // access the geodatabase's feature table Trailheads
                val geodatabaseFeatureTable = geodatabase.getGeodatabaseFeatureTable("Trailheads")
                geodatabaseFeatureTable.loadAsync()
                // create a layer from the geodatabase feature table and add to map
                val featureLayer = FeatureLayer(geodatabaseFeatureTable)
                featureLayer.addDoneLoadingListener {
                    if (featureLayer.loadStatus == LoadStatus.LOADED) {
                        // set viewpoint to the feature layer's extent
                        mapView.setViewpointAsync(Viewpoint(featureLayer.fullExtent))
                    } else {
                        Toast.makeText(this, "Feature Layer failed to load!", Toast.LENGTH_LONG)
                            .show()
                        Log.e(TAG, "Feature Layer failed to load!")
                    }
                }
                // add feature layer to the map
                map.operationalLayers.add(featureLayer)
            } else {
                Toast.makeText(this, "Geodatabase failed to load!", Toast.LENGTH_LONG).show()
                Log.e(TAG, "Geodatabase failed to load!" + geodatabase.loadError)
            }
        }
    }

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

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

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