Create terrain from a local tile package

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/*
 * Copyright 2019 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.samples.createterrainfromalocaltilepackage

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.loadable.LoadStatus
import com.esri.arcgisruntime.mapping.ArcGISScene
import com.esri.arcgisruntime.mapping.ArcGISTiledElevationSource
import com.esri.arcgisruntime.mapping.BasemapStyle
import com.esri.arcgisruntime.mapping.view.Camera
import com.esri.arcgisruntime.mapping.view.SceneView
import com.esri.arcgisruntime.samples.createterrainfromalocaltilepackage.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {

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

    private val sceneView: SceneView by lazy {
        activityMainBinding.sceneView
    }

    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 and add a scene with an imagery basemap
        sceneView.scene = ArcGISScene(BasemapStyle.ARCGIS_IMAGERY)

        // specify the initial camera position
        sceneView.setViewpointCamera(Camera(36.525, -121.80, 300.0, 180.0, 80.0, 0.0))

        // add a ArcGISTiledElevationSource to the scene by passing the URI of the local tile package to the constructor
        with(
            ArcGISTiledElevationSource(
                getExternalFilesDir(null)?.path + getString(R.string.local_tile_package_location)
            )
        ) {
            // add a listener to perform operations when the load status of the ArcGISTiledElevationSource changes
            this.addLoadStatusChangedListener { loadStatusChangedEvent ->
                // when ArcGISTiledElevationSource loads
                if (loadStatusChangedEvent.newLoadStatus == LoadStatus.LOADED) {
                    // add the ArcGISTiledElevationSource to the elevation sources of the scene
                    sceneView.scene.baseSurface.elevationSources.add(this)
                } else if (loadStatusChangedEvent.newLoadStatus == LoadStatus.FAILED_TO_LOAD) {
                    // notify user that the ArcGISTiledElevationSource has failed to load
                    logErrorToUser(getString(R.string.error_tiled_elevation_source_load_failure_message))
                }
            }

            // load the ArcGISTiledElevationSource asynchronously
            this.loadAsync()
        }
    }

    /**
     * AppCompatActivity Extensions
     **/
    private val AppCompatActivity.logTag get() = this::class.java.simpleName

    private fun AppCompatActivity.logErrorToUser(message: String) {
        Toast.makeText(this, message, Toast.LENGTH_LONG).show()
        Log.e(logTag, message)
    }
}