Help creating a file

Question

Hello
I am trying to create txt

  var localFolder = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);

            var file = Path.Combine(localFolder, "Reports.txt");

            using (StreamWriter writer = new StreamWriter(Path.GetFullPath(file))) {

                foreach (var ce in CategoryExpenses) {

                    writer.WriteLine($"{ce.Category} - {ce.Porcentage}");
                }
            }
            var share = DependencyService.Get<IShare>();

            share.Show("Expense report", "Here is your report", file);

Java.Lang.IllegalArgumentException: 'Failed to find configured root that contains /data/data/com.companyname.budget/files/.local/share/Reports.txt'

https://github.com/eduardoagr/Xamarin-Master-Class

Answer 1

Hello,​

Welcome to our Microsoft Q&A platform!

Please change your var localFolder = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData); to var localFolder= FileSystem.AppDataDirectory;, **

FileSystem.AppDataDirectory** comes from Xamarin.Essentialas.

Then open your fille_provider_paths.xml, change files-path like following code.

   <?xml version="1.0" encoding="utf-8" ?>  
   <paths>  
   <files-path name="files" path="."/>  
   </paths>  

Note: Provider path for a specific path as followings:

   <files-path/> --> Context.getFilesDir()  
   <cache-path/> --> Context.getCacheDir()  

If you have some doubts about using FileProvider, you can refer to google's document.

And if you want to share this text file to other application, you need to add chooserIntent.SetFlags(ActivityFlags.NewTask); for chooserIntent in the Share.cs. Otherwise, you will get following exception.

   Android.Util.AndroidRuntimeException: 'Calling startActivity() from outside of an Activity  context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?'  

Best Regards,

Leon Lu

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