Create terrain from a local raster

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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.createterrainfromalocalraster;

import java.util.ArrayList;

import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

import androidx.annotation.Nullable;
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.Basemap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.RasterElevationSource;
import com.esri.arcgisruntime.mapping.view.Camera;
import com.esri.arcgisruntime.mapping.view.SceneView;

public class MainActivity extends AppCompatActivity {

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

  private SceneView mSceneView;

  @Override protected void onCreate(@Nullable 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);

    mSceneView = findViewById(R.id.sceneView);

    // create a scene and add a basemap to it
    ArcGISScene scene = new ArcGISScene(BasemapStyle.ARCGIS_IMAGERY);

    // add the scene to the sceneview
    mSceneView.setScene(scene);

    // specify the initial camera position
    Camera camera = new Camera(36.525, -121.80, 300.0, 180, 80.0, 0.0);
    mSceneView.setViewpointCamera(camera);

    // raster package file paths
    ArrayList<String> filePaths = new ArrayList<>();
    filePaths.add(getExternalFilesDir(null) + getString(R.string.raster_package_location));

    try {
      // add an elevation source to the scene by passing the URI of the raster package to the constructor
      RasterElevationSource rasterElevationSource = new RasterElevationSource(filePaths);

      // add a listener to perform operations when the load status of the elevation source changes
      rasterElevationSource.addLoadStatusChangedListener(loadStatusChangedEvent -> {
        // when elevation source loads
        if (loadStatusChangedEvent.getNewLoadStatus() == LoadStatus.LOADED) {
          // add the elevation source to the elevation sources of the scene
          mSceneView.getScene().getBaseSurface().getElevationSources().add(rasterElevationSource);
        } else if (loadStatusChangedEvent.getNewLoadStatus() == LoadStatus.FAILED_TO_LOAD) {
          // notify user that the elevation source has failed to load
          logErrorToUser(getString(R.string.error_raster_elevation_source_load_failure_message,
              rasterElevationSource.getLoadError()));
        }
      });

      // load the elevation source asynchronously
      rasterElevationSource.loadAsync();
    } catch (IllegalArgumentException e) {
      // catch exception thrown by RasterElevationSource when a file is invalid/not found
      logErrorToUser(getString(R.string.error_raster_elevation_source_load_failure_message, e.getMessage()));
    }
  }

  private void logErrorToUser(String message) {
    Toast.makeText(this, message, Toast.LENGTH_LONG).show();
    Log.e(TAG, message);
  }
}