Error processing file through intent filter .Net MAUI

Question

Error processing file through intent filter .Net MAUI

Влад Тигинян 40

Hello. I'm trying to implement functionality for opening and displaying documents through the intent filter and from the application itself. Opening and displaying the file from within the application itself is no problem, but there is an issue with the intent filter.

So, I will describe my actions.

Added an intent filter to the MainActivity

[IntentFilter(new[] { Intent.ActionView, Intent.ActionMain }, 
    Categories = new[] 
    { Intent.ActionView, 
        Intent.ActionSend, 
        Intent.CategoryDefault, 
        Intent.CategoryBrowsable },
    DataMimeType = "application/pdf")]

In the platform dependent part of the application, I overridden the method OnCreate()

        Intent intent = this.Intent;
        if (intent.Action == Intent.ActionView || (intent.Action == Intent.ActionMain && intent.DataString != null))
        {
            Android.Net.Uri uri = intent.Data;
            WeakReferenceMessenger.Default.Send(new LoggedInUserChangedMessage(uri));
        }

Next, a Android.Net.Url to the file is passed to the common part of the application

protected override void OnAppearing()
    {
        base.OnAppearing();

#if ANDROID
        if (WeakReferenceMessenger.Default.IsRegistered<LoggedInUserChangedMessage>(this))
            return;

        WeakReferenceMessenger.Default.Register<LoggedInUserChangedMessage>(this, async (r, m) =>
        {
            var filePath = Editor.Instance.OpenNamedFile(m.Value);
            if (BindingContext is MainPageViewModel viewModel)
            {
                viewModel.LoadDocumentAsync(filePath);
            }
        });
#endif
	}

In method LoadDocumentAsync(filePath) processes the file asynchronously.

public async void LoadDocumentAsync(string filePath)
        {
            var documentProperties = DocumentRepository.Instance.LoadProperties(filePath);
            if (documentProperties.Type == TypeOfFile.Undefined)
            {
                await Shell.Current.DisplayAlert(title: "", message: "", "ОК");
                return;
            }

            if (!string.IsNullOrEmpty(filePath))
            {
                ClearCollections();
            }

            DocumentTitle = documentProperties.Name;
            DocumentType = documentProperties.Type;
            FilePath = documentProperties.Source;
            IsVisibleMainInfo = true;

#pragma warning disable CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
            Task.Run(async () =>
            {
                if (!CheckInternet.IsConnectedMAUI())
                {
                    await MopupService.Instance.PushAsync(new BaseMopupPage(
#if DEBUG
                    title: "",
#else
                    title: "",
#endif
                    description: "",
                    image: "error.png",
                    isclose: true));

                    await Task.Delay(3000);

                    await MopupService.Instance.PopAsync();
                }
                if (!CheckInternet.IsConnectedMAUI() && DocumentType == TypeOfFile.EDoc)
                {
                    LoadSignatures(filePath);
                    TreatmentSignatures(arraySignatures);
                }
                if (CheckInternet.IsConnectedMAUI())
                {
                    LoadSignatures(filePath);
                    TreatmentSignatures(arraySignatures);
                }
                if (DocumentType == TypeOfFile.EDoc)
                    AttachmentFiles = TreatmentAttachments(eDocument);
                IsComponentVisible = true;
            });
#pragma warning restore CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
        }

If the application was closed when the file was opened, nothing happens. The application starts but the file data is not displayed.

If the application was running and I want to open the file through the intent filter, then a fatal error occurs when executing the asynchronous method.

User's image

Anonymous

2023-07-03T06:06:42.3866667+00:00

If the application was closed when the file was opened, nothing happens. The application starts but the file data is not displayed.

Before testing, you need to run this application in your device or emulator.

I test your code, when you click the pdf file, Android OS will popup window that you can choose your application, then your application will be invoked.

Could you share detailed code about Editor.Instance.OpenNamedFile(m.Value);? Is DocumentRepository from a nugget package? If so, please share it.

Влад Тигинян 40

Yes, I can click on the file and my app will be the option to open. The application starts, but the selected file is not processed (if the application was closed before).

        public string OpenNamedFile(Android.Net.Uri uri)
        {
            try
            {
                var activity = Platform.CurrentActivity;
                ContentResolver contentResolver = activity.ContentResolver;
                Stream stream = contentResolver.OpenInputStream(uri);
                if (stream == null)
                {
                    throw new System.IO.IOException();
                }

                Context context = Platform.AppContext;
                string StorageName = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal) + "/";
                string fileName = FileNameHelper.GetFilenameByUri(context, uri);
                string filePath = StorageName + fileName;
                try
                {
                    FileStream file = System.IO.File.Create(filePath);

                    var memoryStream = new MemoryStream();

                    stream.CopyTo(memoryStream);

                    byte[] byteArray = memoryStream.ToArray();

                    file.Write(byteArray);
                    file.Close();
                    stream.Close();
                    return filePath;
                }
            catch
            {
                throw;
            }
        }
            catch (System.IO.FileNotFoundException exception)
            {
                throw new Exception($"{exception.Message} {System.Environment.NewLine}{exception.ToString}");
            }
            catch (System.IO.IOException exception)
            {
                throw new Exception($"{exception.Message} {System.Environment.NewLine}{exception.ToString}");
            }
            catch (Exception exception)
            {
                throw new Exception($"{exception.Message} {System.Environment.NewLine}{exception.ToString}");
            }
        }

Anonymous

2023-07-04T08:07:34.2466667+00:00

If you can get the uri and copy the pdf file to the application location. This issue is related to LoadDocumentAsync(string filePath) method.

Could you share code about MopupService.Instance.PushAsync() and MopupService.Instance.PushAsync?

1 answer

Your answer

Anonymous

2023-07-03T06:06:42.3866667+00:00

If the application was closed when the file was opened, nothing happens. The application starts but the file data is not displayed.

Before testing, you need to run this application in your device or emulator.

I test your code, when you click the pdf file, Android OS will popup window that you can choose your application, then your application will be invoked.

Could you share detailed code about Editor.Instance.OpenNamedFile(m.Value);? Is DocumentRepository from a nugget package? If so, please share it.
Влад Тигинян 40 Reputation points

2023-07-03T13:18:06.3166667+00:00

Yes, I can click on the file and my app will be the option to open. The application starts, but the selected file is not processed (if the application was closed before).

public string OpenNamedFile(Android.Net.Uri uri) { try { var activity = Platform.CurrentActivity; ContentResolver contentResolver = activity.ContentResolver; Stream stream = contentResolver.OpenInputStream(uri); if (stream == null) { throw new System.IO.IOException(); } Context context = Platform.AppContext; string StorageName = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal) + "/"; string fileName = FileNameHelper.GetFilenameByUri(context, uri); string filePath = StorageName + fileName; try { FileStream file = System.IO.File.Create(filePath); var memoryStream = new MemoryStream(); stream.CopyTo(memoryStream); byte[] byteArray = memoryStream.ToArray(); file.Write(byteArray); file.Close(); stream.Close(); return filePath; } catch { throw; } } catch (System.IO.FileNotFoundException exception) { throw new Exception($"{exception.Message} {System.Environment.NewLine}{exception.ToString}"); } catch (System.IO.IOException exception) { throw new Exception($"{exception.Message} {System.Environment.NewLine}{exception.ToString}"); } catch (Exception exception) { throw new Exception($"{exception.Message} {System.Environment.NewLine}{exception.ToString}"); } }
Anonymous

2023-07-04T08:07:34.2466667+00:00

If you can get the uri and copy the pdf file to the application location. This issue is related to LoadDocumentAsync(string filePath) method.

Could you share code about MopupService.Instance.PushAsync() and MopupService.Instance.PushAsync?

Answer 1

Влад Тигинян 40

This is the Nuget package https://github.com/LuckyDucko/Mopups

I solved the problem with intent filters by adding a static property to the file App.xaml.cs and calling it at the moment the page is loaded.

public partial class App : Application
{
...
	#if ANDROID
	    public static Android.Net.Uri Uri { get; set; }
	#endif
...
}

Anonymous

2023-07-07T08:42:47.6066667+00:00

Thanks for your sharing.

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Error processing file through intent filter .Net MAUI

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