Latest Contributions by KevinCheriyan

This may not exactly be a question about the Maps SDK for .NET, but given that it's a .NET MAUI app that uses the SDK and location services, I thought I'd probe the mobile dev community for advice.  I have a .NET MAUI app with a map page that I'm using to track the location of the user on a map. It basically shows the breadcrumb path the user has taken on their hike with a dashboard showing their distance, timer and average speed. It works exactly as it should when the screen is turned on and the app is on the foreground: path updates when location is changed and dashboard metrics change as expected.  But when the app is minimized/suspended, or if another app is being used, or if the screen is turned off, location stops being tracked. And the timer pauses in the background as well. I restructured some of this code for location tracking to work on a background thread like following, but no changes in results.   mapViewModel.locationDataSource.LocationChanged += async (sender, e) => await LocationChanged(sender, e); // call LocationChanged method when location changes in LocationDataSource private async Task LocationChanged(object sender, Esri.ArcGISRuntime.Location.Location e) { await Task.Run(() => { MapPoint mp = e.Position; UpdatePolyline(mp) } private void UpdatePolyline(MapPoint mp) { polylineBuilder.AddPoint(mp); Geometry polylineGeometry = polylineBuilder.ToGeometry(); // UI updates marshaled to the main thread. MainThread.BeginInvokeOnMainThread(() => { trackedHikePolylineGraphicsOverlay.Graphics.Clear(); trackedHikePolylineGraphicsOverlay.Graphics.Add(new Graphic(polylineGeometry)); }); }   I've also added these permissions to my AndroidManifest.xml   <uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION"/> <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />   I will also need to add similar permissions to the .plist for iOS permissions. Not sure what they are yet.  What have other developers done to implement background location tracking in their .NET MAUI apps? I know Android and iOS apps can do this, because I can record a manual activity in Strava while my screen is turned off. Permissions for my Maui app is set to "Allow location all the time" for Precise location. Thanks in advance! ... View more

I have a mobile application built in .NET MAUI that has a hike tracking feature. Basically, the goal is to show the traversed path as a polyline on the map. This is the basic code I'm using to perform the calculation and do tracking using Maps SDK   MapPoint mp = e.Position; // e = Esri.ArcGISRuntime.Location.Location from location changed event mp = (MapPoint)GeometryEngine.Project(e.Position, SpatialReferences.WebMercator); polylineBuilder.AddPoint(mp); trackedHikePolylineGraphicsOverlay.Graphics.Add(new Graphic(polylineBuilder.ToGeometry()));   I'm essentially adding the user's current location from the location changed event to the polyline builder and updating the graphics overlay. Nothing complicated.  My problem is that when this is tested in the field, I end up with wildly zigzagging polylines because location gets miscalculated at times by the GPS. How do ESRI apps and even apps like Strava track breadcrumb path and show that on a map without erratic lines? I realize it is not a hardware problem, because other tracking apps on the same device can record a reasonably well polyline for the same activity.  Thanks!   ... View more

Background: I have a .NET MAUI Application that I'm building for iOS devices. The application uses an MMPK for offline data storage, so whatever solution I implement to this problem must utilize MMPK data or coexist with it. Problem: I have a dataset consisting of lines (>11,000 features) and points (>2500) that intersect those lines. See a sample of what this data might look like: I want to be able to calculate the distance traversed from any given point feature along a line feature, respecting direction. So, essentially, what's the point on "brown" line feature that is x distance away from "green" point that intersects with this line? My attempted solution: Create network dataset and build it in ArcGIS Pro. Then add feature dataset containing ND to MMPK. In the app, create a ServiceAreaTask from transportation network dataset from the MMPK. Add ServiceAreaParameters, where I set my "green" points as facilities, and add default impedance cutoffs to distance x. Solve Service Area of facilities. Get my point outputs on the line features from this result.   I'm stuck at the part where I'm creating my ServiceAreaTask with the transportation network dataset, after realizing that I probably should be creating a network dataset with just the single line segment in question, instead of ALL the line segments. Am I correct in my assumption here? If I create a network dataset with all my line segments, then the calculation for the shortest route along any single line segment will be compromised by other intersecting lines. Instead, for this to work, I need to create network datasets on the fly from the line segment in question. But as far as I know, there's no way to do this in .NET Maps SDK. I need a transportation or utility network to start the ServiceAreaLayer task, but the only way to create this is external to the SDK.  So, how can I fix this problem for use in my MAUI application? Can I still use Network Analysis? Or do I need to come up with my own version of calculating distance traversed along line segment? Please tell me I don't have to implement Djikstra's algorithm to solve this in .NET 😶 Thanks for the help!     ... View more

I have a .NET MAUI app in which I'm trying to create a network service area analysis task using a local geodatabase's network dataset. See here for docs. The geodatabase exists directly in the code directory inside a Data assets folder (Project/Data/FT_Data.gdb). My eventual goal is to use an MMPK that I download from a non-Portal, non-AGOL network server that contains the network dataset in question. But for now, I'm starting off trying to feed the local gdb in. This is where I'm running into issues. See code below:     string dbLocation = System.IO.Path.Combine(Environment.CurrentDirectory, @"Data", @"FT_data.gdb"); ServiceAreaTask serviceAreaTask = await ServiceAreaTask.CreateAsync(dbLocation, "network");     The application crashes at Line 1 here, because it cannot find the geodatabase at this location. I know this logic generally works at finding other files, since I've tried the same line with an MMPK that exists, and it can find it no problem. The issue results from not being able to set the build action for a geodatabase in Visual Studio's Solution Explorer pane. With an MMPK or other files, I can set the Build action to "Content" and it will work. But for a geodatabase that exists as a directory in Solution Explorer, I don't want to go in and set the build action for each of the binary files. So, there you have it. How can I reference a local geodatabase that already exists? I'm trying to do a pretty simple task that the .NET Maps SDK tells me I should be able to. But the only examples I could find are gdb downloaded from ArcGIS Enterprise Portal or Online and then stored in a folder outside the code.  Thank you! ... View more