Generate offline map (overrides)

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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.

using Android.App;
using Android.OS;
using Android.Widget;
using ArcGISRuntime.Samples.GenerateOfflineMapWithOverrides;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Portal;
using Esri.ArcGISRuntime.Symbology;
using Esri.ArcGISRuntime.Tasks;
using Esri.ArcGISRuntime.Tasks.Offline;
using Esri.ArcGISRuntime.UI;
using Esri.ArcGISRuntime.UI.Controls;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using AlertDialog = Android.App.AlertDialog;

namespace ArcGISRuntimeXamarin.Samples.GenerateOfflineMapWithOverrides
{
    [Activity(ConfigurationChanges = Android.Content.PM.ConfigChanges.Orientation | Android.Content.PM.ConfigChanges.ScreenSize)]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Generate offline map (overrides)",
        category: "Map",
        description: "Take a web map offline with additional options for each layer.",
        instructions: "Modify the overrides parameters:",
        tags: new[] { "LOD", "adjust", "download", "extent", "filter", "offline", "override", "parameters", "reduce", "scale range", "setting" })]
    public class GenerateOfflineMapWithOverrides : Activity
    {
        // Mapview.
        private MapView _mapView;

        // Generate Button.
        private Button _takeMapOfflineButton;

        // Progress indicator.
        private AlertDialog _alertDialog;
        private ProgressBar _progressIndicator;

        // The job to generate an offline map.
        private GenerateOfflineMapJob _generateOfflineMapJob;

        // The extent of the data to take offline.
        private Envelope _areaOfInterest = new Envelope(-88.1541, 41.7690, -88.1471, 41.7720, SpatialReferences.Wgs84);

        // The ID for a web map item hosted on the server (water network map of Naperville IL).
        private const string WebMapId = "acc027394bc84c2fb04d1ed317aac674";

        // Values for taking things the map offline.
        private string _packagePath;
        private OfflineMapTask _takeMapOfflineTask;
        private GenerateOfflineMapParameters _parameters;
        private GenerateOfflineMapParameterOverrides _overrides;

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);
            Title = "Generate offline map (overrides)";

            // Create the UI, setup the control references and execute initialization.
            CreateLayout();
            Initialize();
        }

        private void CreateLayout()
        {
            // Create the layout.
            LinearLayout layout = new LinearLayout(this)
            {
                Orientation = Orientation.Vertical
            };

            // Add the generate button.
            _takeMapOfflineButton = new Button(this)
            {
                Text = "Take map offline"
            };
            _takeMapOfflineButton.Click += TakeMapOfflineButton_Click;
            layout.AddView(_takeMapOfflineButton);

            // Add the mapview.
            _mapView = new MapView(this);
            layout.AddView(_mapView);

            // Add the layout to the view.
            SetContentView(layout);

            // Create the progress dialog display.
            _progressIndicator = new ProgressBar(this);
            _progressIndicator.SetProgress(40, true);
            AlertDialog.Builder builder = new AlertDialog.Builder(this).SetView(_progressIndicator);
            builder.SetCancelable(true);
            builder.SetMessage("Generating offline map ...");
            _alertDialog = builder.Create();
            _alertDialog.SetButton("Cancel", (s, e) => { _generateOfflineMapJob.CancelAsync(); });
        }

        private async void Initialize()
        {
            try
            {
                // Create the ArcGIS Online portal.
                ArcGISPortal portal = await ArcGISPortal.CreateAsync();

                // Get the Naperville water web map item using its ID.
                PortalItem webmapItem = await PortalItem.CreateAsync(portal, WebMapId);

                // Create a map from the web map item.
                Map onlineMap = new Map(webmapItem);

                // Display the map in the MapView.
                _mapView.Map = onlineMap;

                // Disable user interactions on the map (no panning or zooming from the initial extent).
                _mapView.InteractionOptions = new MapViewInteractionOptions
                {
                    IsEnabled = false
                };

                // Create a graphics overlay for the extent graphic and apply a renderer.
                SimpleLineSymbol aoiOutlineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, System.Drawing.Color.Red, 3);
                GraphicsOverlay extentOverlay = new GraphicsOverlay
                {
                    Renderer = new SimpleRenderer(aoiOutlineSymbol)
                };
                _mapView.GraphicsOverlays.Add(extentOverlay);

                // Add a graphic to show the area of interest (extent) that will be taken offline.
                Graphic aoiGraphic = new Graphic(_areaOfInterest);
                extentOverlay.Graphics.Add(aoiGraphic);
            }
            catch (Exception ex)
            {
                // Show the exception message to the user.
                ShowStatusMessage(ex.Message);
            }
        }

        private async void TakeMapOfflineButton_Click(object sender, EventArgs e)
        {
            // Create a path for the output mobile map.
            string tempPath = $"{Path.GetTempPath()}";
            string[] outputFolders = Directory.GetDirectories(tempPath, "NapervilleWaterNetwork*");

            // Loop through the folder names and delete them.
            foreach (string dir in outputFolders)
            {
                try
                {
                    // Delete the folder.
                    Directory.Delete(dir, true);
                }
                catch (Exception)
                {
                    // Ignore exceptions (files might be locked, for example).
                }
            }

            // Create a new folder for the output mobile map.
            _packagePath = Path.Combine(tempPath, @"NapervilleWaterNetwork");
            int num = 1;
            while (Directory.Exists(_packagePath))
            {
                _packagePath = Path.Combine(tempPath, @"NapervilleWaterNetwork" + num.ToString());
                num++;
            }

            // Create the output directory.
            Directory.CreateDirectory(_packagePath);

            try
            {
                // Create an offline map task with the current (online) map.
                _takeMapOfflineTask = await OfflineMapTask.CreateAsync(_mapView.Map);

                // Create the default parameters for the task, pass in the area of interest.
                _parameters = await _takeMapOfflineTask.CreateDefaultGenerateOfflineMapParametersAsync(_areaOfInterest);

                // Get the overrides.
                _overrides = await _takeMapOfflineTask.CreateGenerateOfflineMapParameterOverridesAsync(_parameters);

                // Create the overrides UI.
                ParameterOverrideFragment overlayFragment = new ParameterOverrideFragment(_overrides, _mapView.Map);

                // Complete configuration when the dialog is closed.
                overlayFragment.FinishedConfiguring += ConfigurationContinuation;

                // Display the configuration window.
                overlayFragment.Show(FragmentManager, "");
            }
            catch (Exception ex)
            {
                // Exception while taking the map offline.
                ShowStatusMessage(ex.Message);
            }
        }

        private async void ConfigurationContinuation(object sender, EventArgs e)
        {
            try
            {
                // Show the progress dialog while the job is running.
                _alertDialog.Show();

                // Create the job with the parameters and output location.
                _generateOfflineMapJob = _takeMapOfflineTask.GenerateOfflineMap(_parameters, _packagePath, _overrides);

                // Handle the progress changed event for the job.
                _generateOfflineMapJob.ProgressChanged += OfflineMapJob_ProgressChanged;

                // Await the job to generate geodatabases, export tile packages, and create the mobile map package.
                GenerateOfflineMapResult results = await _generateOfflineMapJob.GetResultAsync();

                // Check for job failure (writing the output was denied, e.g.).
                if (_generateOfflineMapJob.Status != JobStatus.Succeeded)
                {
                    // Report failure to the user.
                    ShowStatusMessage("Failed to take the map offline.");
                }

                // Check for errors with individual layers.
                if (results.LayerErrors.Any())
                {
                    // Build a string to show all layer errors.
                    System.Text.StringBuilder errorBuilder = new System.Text.StringBuilder();
                    foreach (KeyValuePair<Layer, Exception> layerError in results.LayerErrors)
                    {
                        errorBuilder.AppendLine($"{layerError.Key.Id} : {layerError.Value.Message}");
                    }

                    // Show layer errors.
                    ShowStatusMessage(errorBuilder.ToString());
                }

                // Display the offline map.
                _mapView.Map = results.OfflineMap;

                // Apply the original viewpoint for the offline map.
                _mapView.SetViewpoint(new Viewpoint(_areaOfInterest));

                // Enable map interaction so the user can explore the offline data.
                _mapView.InteractionOptions.IsEnabled = true;

                // Change the title and disable the "Take map offline" button.
                _takeMapOfflineButton.Text = "Map is offline";
                _takeMapOfflineButton.Enabled = false;
            }
            catch (TaskCanceledException)
            {
                // Generate offline map task was canceled.
                ShowStatusMessage("Taking map offline was canceled");
            }
            catch (Exception ex)
            {
                // Exception while taking the map offline.
                ShowStatusMessage(ex.Message);
            }
            finally
            {
                _alertDialog.Dismiss();
            }
        }

        private void ShowStatusMessage(string message)
        {
            // Display the message to the user.
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.SetMessage(message).SetTitle("Alert").Show();
        }

        // Show changes in job progress.
        private void OfflineMapJob_ProgressChanged(object sender, EventArgs e)
        {
            // Get the job.
            GenerateOfflineMapJob job = sender as GenerateOfflineMapJob;

            // Dispatch to the UI thread.
            RunOnUiThread(() =>
            {
                // Show the percent complete and update the progress bar.
                string percentText = job.Progress > 0 ? job.Progress.ToString() + " %" : string.Empty;
                _progressIndicator.Progress = job.Progress;
                _alertDialog.SetMessage($"Taking map offline ({percentText}) ...");
            });
        }
    }
}