Multi tool use

How to get list of downloaded files from External File Directory in xamarin.forms?

I am working in xamarin.forms. I want to download file and also want to show all the downloaded files as a list. I want to implement this feature in both android and IOS.

I took reference from below link to download files. It was successfully implemented.

https://forums.xamarin.com/discussion/71203/how-to-download-a-file-in-xamarin-forms-and-store-it-in-the-device-storage

But Now I want to list out all the downloaded files which are available in that folder. I did not any solution for the same.

For android :

public void Downloaded()
{
CrossDownloadManager.Current.PathNameForDownloadedFile = new Func<Plugin.DownloadManager.Abstractions.IDownloadFile, string>(file => {
string fileName = Android.Net.Uri.Parse(file.Url).Path.Split('/').Last();
return Path.Combine(ApplicationContext.GetExternalFilesDir(Android.OS.Environment.DirectoryDownloads).AbsolutePath,fileName);

});
}


For IOS :

public void Downloaded()
{
CrossDownloadManager.Current.PathNameForDownloadedFile = new Func<Plugin.DownloadManager.Abstractions.IDownloadFile, string>(file => {
string fileName = (new NSUrl(file.Url, false)).LastPathComponent;
return Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), fileName);

});
}


These both function I have called in MainActivity and AppDelegate respectively.

IN PCL Content Page :

public partial class MainPage : ContentPage
{
public bool isDownloading = true;
public IDownloadFile File;
public MainPage()
{
InitializeComponent();
CrossDownloadManager.Current.CollectionChanged += (sender, e) => System.Diagnostics.Debug.WriteLine(
"[DownloadManager] " + e.Action +
" -> New items: " + (e.NewItems?.Count ?? 0) +
" at " + e.NewStartingIndex +
" || Old items: " + (e.OldItems?.Count ?? 0) +
" at " + e.OldStartingIndex
);
}

public async void DownloadFile(string FileName)
{
await Task.Yield();
await Task.Run(() =>
{
var downloadManager = CrossDownloadManager.Current;
var file = downloadManager.CreateDownloadFile(FileName);
downloadManager.Start(file, true);
while(isDownloading)
{
isDownloading = IsDownloading(file);
}
});
if(!isDownloading)
{
await DisplayAlert("Success", "Your file has been downloaded", "Ok");
}
}

public bool IsDownloading(IDownloadFile File)
{
if (File == null) return false;

switch (File.Status)
{
case DownloadFileStatus.INITIALIZED:
case DownloadFileStatus.PAUSED:
case DownloadFileStatus.PENDING:
case DownloadFileStatus.RUNNING:
return true;

case DownloadFileStatus.COMPLETED:
case DownloadFileStatus.CANCELED:
case DownloadFileStatus.FAILED:
return false;
default:
throw new ArgumentOutOfRangeException();
}
}

public void AbortDownloading()
{
CrossDownloadManager.Current.Abort(File);
}

private void Button_Clicked(object sender, EventArgs e)
{
var url = "http://www.orimi.com/pdf-test.pdf";
DownloadFile(url);
}
}


My file path in android is "/storage/emulated/0/Android/data/com.XYZ.projectName/file/Download"

What should I do to get list of files and display in content page? when tap on file name document should be open in specific application.

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