Latest Contributions by YifanLiu

Hi Jennifer, What I was missing is in this line: await feature.AddAttachmentAsync("test.png", "image/png", bytes); I put "image/" instead of "image/png", which is what breaks things. Thank you! Best, Yifan ... View more

Thanks for the reply Nagma. I am developing for Android and the API is different from WPF. So, unfortunately, your suggestion would not work. Still appreciate it! ... View more

This is exactly what I need, thank you! ... View more

Could you elaborate how to query group content? GetGroupsAsync does not seem to provide a way to query the content in a group. ... View more

The PortalGroup class, which can be accessed through getGroupsAsync, does not provide a way to see the content in the group. But thanks still Nagma! ... View more

After researching on the await and async programming of C#, I realized my problem was because of a deadlock. setting the configureAwait(false) avoids the deadlock by allowing the MobileMapPackage.openAsync to pick up an idle thread from the threadpool instead of waiting for the UI SynchronizationContext. See the quote below on this issue: The root cause of this deadlock is due to the way await handles contexts. By default, when an incomplete Task is awaited, the current “context” is captured and used to resume the method when the Task completes. This “context” is the current SynchronizationContext unless it’s null, in which case it’s the current TaskScheduler. GUI and ASP.NET applications have a SynchronizationContext that permits only one chunk of code to run at a time. When the await completes, it attempts to execute the remainder of the async method within the captured context. But that context already has a thread in it, which is (synchronously) waiting for the async method to complete. They’re each waiting for the other, causing a deadlock. Link is here: Async/Await - Best Practices in Asynchronous Programming  ... View more

Thanks a lot @Greg DeStigter  the mmpk file works. I've been trying different things and found out that adding ConfigureAwait(false) to the OpenAsync(mmpkPath) fixes this issue. See my new code below, note the change on line 26: I am still researching why I have to add ConfigureAwait here. If you know the reason, can you please share it here?     private async Task<MobileMapPackage> OpenMmpkAsync()     {         try         {                 //string filePath = Path.Combine(Android.OS.Environment.ExternalStorageDirectory.Path, "map.mmpk");                 //MobileMapPackage mmpk = await MobileMapPackage.OpenAsync(filePath);                 //var mmpk = await MobileMapPackage.OpenAsync(Path.Combine(DownloadViewModel.GetDataFolder(), AppSettings.CurrentSettings.PortalItemName));                 var mmpkName = "map.mmpk";                 AssetManager assestManager = this.Assets;                 // Open the map package asset                 using (var packageAsset = Assets.Open(mmpkName))                 {                     // Copy it to a writable location                     using (var packageTarget = OpenFileOutput(mmpkName, FileCreationMode.WorldWriteable))                     {                         packageAsset.CopyTo(packageTarget);                     }                 }                 var mmpkPath = GetFileStreamPath(mmpkName).AbsolutePath;                                 return await MobileMapPackage.OpenAsync(mmpkPath).ConfigureAwait(false);             }         }         catch (Exception ex)         {             System.Diagnostics.Debug.WriteLine(ex);             return null;         }     } ‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ Greg DeStigter wrote: Yifan Liu I'm using your code almost exactly in an Android test app that I have and it seems to be working as I expect. Perhaps it's related to your MMPK file. Could you try another and see if it works?   Here's the bulk of my test code for reference: [Activity(Label = "LocalData.Droid", MainLauncher = true, Icon = "@drawable/icon")] public class MainActivity : Activity {     protected override async void OnCreate(Bundle bundle)     {         base.OnCreate(bundle);         var mmpk = await OpenMmpkAsync();         SetContentView(new MapView() { Map = mmpk.Maps.FirstOrDefault() });     }     private async Task<MobileMapPackage> OpenMmpkAsync()     {         try         {             var mmpkName = "multiplemaps.mmpk";             using (var mmpkAsset = Assets.Open(mmpkName))             using (var mmpkTarget = OpenFileOutput(mmpkName, FileCreationMode.WorldWriteable))             {                 mmpkAsset.CopyTo(mmpkTarget);             }             var mmpkPath = GetFileStreamPath(mmpkName).AbsolutePath;             return await MobileMapPackage.OpenAsync(mmpkPath);         }         catch (Exception ex)         {             System.Diagnostics.Debug.WriteLine(ex);             return null;         }     } }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ ... View more