private async void Initialize()
{
try
{
// Create a new Map with a streets basemap.
Map myMap = new Map(Basemap.CreateStreets());
// Create the URI to the Service Requests map service.
Uri serviceRequestUri = new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/ServiceRequest/MapServer");
// Create a new ArcGISMapImageLayer that uses the service URI.
ArcGISMapImageLayer serviceRequestsMapImageLayer = new ArcGISMapImageLayer(serviceRequestUri);
// Load all sublayers and tables contained by the map image layer.
await serviceRequestsMapImageLayer.LoadTablesAndLayersAsync();
// Set the initial map extent to the extent of all service request features.
Envelope requestsExtent = serviceRequestsMapImageLayer.FullExtent;
myMap.InitialViewpoint = new Viewpoint(requestsExtent);
// Add the layer to the map.
myMap.OperationalLayers.Add(serviceRequestsMapImageLayer);
// Get the service request comments table from the map image layer.
ServiceFeatureTable commentsTable = serviceRequestsMapImageLayer.Tables[0];
// Create query parameters to get all non-null service request comment records (features) from the table.
QueryParameters queryToGetNonNullComments = new QueryParameters
{
WhereClause = "requestid <> '' AND comments <> ''"
};
// Query the comments table to get the non-null records.
FeatureQueryResult commentQueryResult = await commentsTable.QueryFeaturesAsync(queryToGetNonNullComments, QueryFeatureFields.LoadAll);
// Show the records from the service request comments table in the list view control.
CommentsListBox.ItemsSource = commentQueryResult.ToList();
// Create a graphics overlay to show selected features and add it to the map view.
_selectedFeaturesOverlay = new GraphicsOverlay();
MyMapView.GraphicsOverlays.Add(_selectedFeaturesOverlay);
// Assign the map to the MapView.
MyMapView.Map = myMap;
}
catch (Exception e)
{
Debug.WriteLine(e);
}
;
}
private async Task Initialize()
{
// Create a new Map with a streets basemap.
Map myMap = new Map(Basemap.CreateStreets());
// Create the URI to the Service Requests map service.
Uri serviceRequestUri = new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/ServiceRequest/MapServer");
// Create a new ArcGISMapImageLayer that uses the service URI.
ArcGISMapImageLayer serviceRequestsMapImageLayer = new ArcGISMapImageLayer(serviceRequestUri);
// Load all sublayers and tables contained by the map image layer.
await serviceRequestsMapImageLayer.LoadTablesAndLayersAsync();
// Set the initial map extent to the extent of all service request features.
Envelope requestsExtent = serviceRequestsMapImageLayer.FullExtent;
myMap.InitialViewpoint = new Viewpoint(requestsExtent);
// Add the layer to the map.
myMap.OperationalLayers.Add(serviceRequestsMapImageLayer);
// Get the service request comments table from the map image layer.
ServiceFeatureTable commentsTable = serviceRequestsMapImageLayer.Tables[0];
// Create query parameters to get all non-null service request comment records (features) from the table.
QueryParameters queryToGetNonNullComments = new QueryParameters
{
WhereClause = "requestid <> '' AND comments <> ''"
};
// Query the comments table to get the non-null records.
FeatureQueryResult commentQueryResult = await commentsTable.QueryFeaturesAsync(queryToGetNonNullComments, QueryFeatureFields.LoadAll);
// Store the comments in a list.
_commentFeatures = commentQueryResult.ToList();
// Show the comment text from the service request comments records in the list view control.
var comments = _commentFeatures.Select(c => c.Attributes["comments"]);
ArrayAdapter commentsAdapter = new ArrayAdapter(this, Android.Resource.Layout.SimpleSpinnerItem, comments.ToArray());
_commentsListBox.Adapter = commentsAdapter;
// Create a graphics overlay to show selected features and add it to the map view.
_selectedFeaturesOverlay = new GraphicsOverlay();
_myMapView.GraphicsOverlays.Add(_selectedFeaturesOverlay);
// Assign the map to the MapView.
_myMapView.Map = myMap;
}
private async void Initialize()
{
// Create a new Map with a vector streets basemap.
Map myMap = new Map(Basemap.CreateStreetsVector());
// Create the URI to the Service Requests map service.
Uri serviceRequestUri = new Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/ServiceRequest/MapServer");
// Create a new ArcGISMapImageLayer that uses the service URI.
ArcGISMapImageLayer serviceRequestsMapImageLayer = new ArcGISMapImageLayer(serviceRequestUri);
try
{
// Load all sublayers and tables contained by the map image layer.
await serviceRequestsMapImageLayer.LoadTablesAndLayersAsync();
// Set the initial map extent to the extent of all service request features.
Envelope requestsExtent = serviceRequestsMapImageLayer.FullExtent;
myMap.InitialViewpoint = new Viewpoint(requestsExtent);
// Add the layer to the map.
myMap.OperationalLayers.Add(serviceRequestsMapImageLayer);
// Get the service request comments table from the map image layer.
ServiceFeatureTable commentsTable = serviceRequestsMapImageLayer.Tables[0];
// Create query parameters to get all non-null service request comment records (features) from the table.
QueryParameters queryToGetNonNullComments = new QueryParameters
{
WhereClause = "requestid <> '' AND comments <> ''"
};
// Query the comments table to get the non-null records.
FeatureQueryResult commentQueryResult = await commentsTable.QueryFeaturesAsync(queryToGetNonNullComments, QueryFeatureFields.LoadAll);
// Show the records from the service request comments table in the UITableView control.
foreach (ArcGISFeature commentFeature in commentQueryResult)
{
_serviceRequestComments.Add(commentFeature);
}
// Create the table view source that uses the list of features.
_commentsTableSource = new ServiceRequestCommentsTableSource(_serviceRequestComments);
// Assign the table view source to the table view control.
_tableView.Source = _commentsTableSource;
// Subscribe to event.
_commentsTableSource.ServiceRequestCommentSelected += CommentsTableSource_ServiceRequestCommentSelected;
// Create a graphics overlay to show selected features and add it to the map view.
_selectedFeaturesOverlay = new GraphicsOverlay();
_myMapView.GraphicsOverlays.Add(_selectedFeaturesOverlay);
// Assign the map to the MapView.
_myMapView.Map = myMap;
// Reload the table view data to refresh the display.
_tableView.ReloadData();
}
catch (Exception e)
{
new UIAlertView("Error", e.ToString(), (IUIAlertViewDelegate)null, "OK", null).Show();
}
}
private async void submitQuery(UIAlertAction obj)
{
// If the population value entered is not numeric, warn the user and exit.
double populationNumber;
if (!double.TryParse(_queryEntry.Text.Trim(), out populationNumber))
{
UIAlertController alert = UIAlertController.Create("Invalid number", "Population value must be numeric.", UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(alert, true, null);
return;
}
// Get the USA map image layer (the first and only operational layer in the map).
ArcGISMapImageLayer usaMapImageLayer = (ArcGISMapImageLayer)_myMapView.Map.OperationalLayers[0];
try
{
// Use a utility method on the map image layer to load all the sublayers and tables.
await usaMapImageLayer.LoadTablesAndLayersAsync();
// Get the sublayers of interest (skip 'Highways' since it doesn't have the POP2000 field).
ArcGISMapImageSublayer citiesSublayer = (ArcGISMapImageSublayer)usaMapImageLayer.Sublayers[0];
ArcGISMapImageSublayer statesSublayer = (ArcGISMapImageSublayer)usaMapImageLayer.Sublayers[2];
ArcGISMapImageSublayer countiesSublayer = (ArcGISMapImageSublayer)usaMapImageLayer.Sublayers[3];
// Get the service feature table for each of the sublayers.
ServiceFeatureTable citiesTable = citiesSublayer.Table;
ServiceFeatureTable statesTable = statesSublayer.Table;
ServiceFeatureTable countiesTable = countiesSublayer.Table;
// Create the query parameters that will find features in the current extent with a population greater than the value entered.
QueryParameters populationQuery = new QueryParameters
{
WhereClause = "POP2000 > " + populationNumber,
Geometry = _myMapView.GetCurrentViewpoint(ViewpointType.BoundingGeometry).TargetGeometry
};
// Query each of the sublayers with the query parameters.
FeatureQueryResult citiesQueryResult = await citiesTable.QueryFeaturesAsync(populationQuery);
FeatureQueryResult statesQueryResult = await statesTable.QueryFeaturesAsync(populationQuery);
FeatureQueryResult countiesQueryResult = await countiesTable.QueryFeaturesAsync(populationQuery);
// Display the selected cities in the graphics overlay.
SimpleMarkerSymbol citySymbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Circle, Color.Red, 16);
foreach (Feature city in citiesQueryResult)
{
Graphic cityGraphic = new Graphic(city.Geometry, citySymbol);
_selectedFeaturesOverlay.Graphics.Add(cityGraphic);
}
// Display the selected counties in the graphics overlay.
SimpleLineSymbol countyLineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Dash, Color.Cyan, 2);
SimpleFillSymbol countySymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.DiagonalCross, Color.Cyan, countyLineSymbol);
foreach (Feature county in countiesQueryResult)
{
Graphic countyGraphic = new Graphic(county.Geometry, countySymbol);
_selectedFeaturesOverlay.Graphics.Add(countyGraphic);
}
// Display the selected states in the graphics overlay.
SimpleLineSymbol stateLineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.DarkCyan, 6);
SimpleFillSymbol stateSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.Null, Color.Cyan, stateLineSymbol);
foreach (Feature state in statesQueryResult)
{
Graphic stateGraphic = new Graphic(state.Geometry, stateSymbol);
_selectedFeaturesOverlay.Graphics.Add(stateGraphic);
}
}
catch (Exception e)
{
new UIAlertView("Error", e.ToString(), (IUIAlertViewDelegate)null, "OK", null).Show();
}
}
private async void QuerySublayers_Click(object sender, System.Windows.RoutedEventArgs e)
{
// Clear selected features from the graphics overlay.
_selectedFeaturesOverlay.Graphics.Clear();
// If the population value entered is not numeric, warn the user and exit.
double populationNumber = 0.0;
if (!double.TryParse(PopulationTextBox.Text.Trim(), out populationNumber))
{
MessageBox.Show("The population value must be numeric.", "Query error");
return;
}
// Get the USA map image layer (the first and only operational layer in the map).
ArcGISMapImageLayer usaMapImageLayer = (ArcGISMapImageLayer)MyMapView.Map.OperationalLayers[0];
try
{
// Use a utility method on the map image layer to load all the sublayers and tables.
await usaMapImageLayer.LoadTablesAndLayersAsync();
// Get the sublayers of interest (skip 'Highways' since it doesn't have the POP2000 field).
ArcGISMapImageSublayer citiesSublayer = (ArcGISMapImageSublayer)usaMapImageLayer.Sublayers[0];
ArcGISMapImageSublayer statesSublayer = (ArcGISMapImageSublayer)usaMapImageLayer.Sublayers[2];
ArcGISMapImageSublayer countiesSublayer = (ArcGISMapImageSublayer)usaMapImageLayer.Sublayers[3];
// Get the service feature table for each of the sublayers.
ServiceFeatureTable citiesTable = citiesSublayer.Table;
ServiceFeatureTable statesTable = statesSublayer.Table;
ServiceFeatureTable countiesTable = countiesSublayer.Table;
// Create the query parameters that will find features in the current extent with a population greater than the value entered.
QueryParameters populationQuery = new QueryParameters
{
WhereClause = "POP2000 > " + PopulationTextBox.Text,
Geometry = MyMapView.GetCurrentViewpoint(ViewpointType.BoundingGeometry).TargetGeometry
};
// Query each of the sublayers with the query parameters.
FeatureQueryResult citiesQueryResult = await citiesTable.QueryFeaturesAsync(populationQuery);
FeatureQueryResult statesQueryResult = await statesTable.QueryFeaturesAsync(populationQuery);
FeatureQueryResult countiesQueryResult = await countiesTable.QueryFeaturesAsync(populationQuery);
// Display the selected cities in the graphics overlay.
SimpleMarkerSymbol citySymbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Circle, Color.Red, 16);
foreach (Feature city in citiesQueryResult)
{
Graphic cityGraphic = new Graphic(city.Geometry, citySymbol);
_selectedFeaturesOverlay.Graphics.Add(cityGraphic);
}
// Display the selected counties in the graphics overlay.
SimpleLineSymbol countyLineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Dash, Color.Cyan, 2);
SimpleFillSymbol countySymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.DiagonalCross, Color.Cyan, countyLineSymbol);
foreach (Feature county in countiesQueryResult)
{
Graphic countyGraphic = new Graphic(county.Geometry, countySymbol);
_selectedFeaturesOverlay.Graphics.Add(countyGraphic);
}
// Display the selected states in the graphics overlay.
SimpleLineSymbol stateLineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.DarkCyan, 6);
SimpleFillSymbol stateSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.Null, Color.Cyan, stateLineSymbol);
foreach (Feature state in statesQueryResult)
{
Graphic stateGraphic = new Graphic(state.Geometry, stateSymbol);
_selectedFeaturesOverlay.Graphics.Add(stateGraphic);
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString(), "Error");
}
}
