/// <summary>
/// liefert das DocumentFile für eine Datei oder ein Verzeichnis (API level 14)
/// <para>Wenn das Objekt noch nicht ex., wird es erzeugt. Auch ein notwendiger Pfad wird vollständig erzeugt.</para>
/// </summary>
/// <param name="storagename">z.B. "primary" oder "19F4-0903"</param>
/// <param name="volpath">abs. Pfad im Volume</param>
/// <param name="isDirectory">Pfad bezieht sich auf eine Datei oder ein Verzeichnis</param>
/// <returns></returns>
public DocumentFile GetDocumentFile(string storagename, string volpath, bool isDirectory)
{
global::Android.Net.Uri rooturi = GetTreeDocumentUri(storagename);
DocumentFile document = DocumentFile.FromTreeUri(Activity.ApplicationContext, rooturi);
string[] pathelems = volpath.Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
for (int i = 0; document != null && i < pathelems.Length; i++)
{
DocumentFile nextDocument = document.FindFile(pathelems[i]);
if (nextDocument == null)
{
if ((i < pathelems.Length - 1) || isDirectory)
{
nextDocument = document.CreateDirectory(pathelems[i]);
}
else
{
nextDocument = document.CreateFile("", pathelems[i]);
}
}
document = nextDocument;
}
System.Diagnostics.Debug.WriteLine("AndroidGetDocumentFile(" + storagename + ", " + volpath + ", " + isDirectory.ToString() + ") = " + (document != null && (isDirectory == document.IsDirectory)).ToString());
return(document != null ?
(isDirectory == document.IsDirectory ? document : null) :
null);
}
public async Task <IFolder> CreateFolderAsync(string desiredName, CreationCollisionOption option, CancellationToken cancellationToken = default(CancellationToken))
{
desiredName = await EnsureExistence(desiredName, option, cancellationToken);
var newFolder = folder.CreateDirectory(desiredName);
return(new AndroidFolder(context, newFolder, this));
}
public override async Task <StorageFolder> CreateFolderAsync(string folderName, Windows.Storage.CreationCollisionOption option, CancellationToken token)
{
return(await Task.Run(async() =>
{
var existingItem = await TryGetItemAsync(folderName, token);
switch (option)
{
case CreationCollisionOption.ReplaceExisting:
if (existingItem is StorageFile)
{
throw new UnauthorizedAccessException("There is already a file with the same name.");
}
if (existingItem is StorageFolder folder)
{
// Delete existing folder recursively
await folder.DeleteAsync();
}
break;
case CreationCollisionOption.FailIfExists:
if (existingItem != null)
{
throw new UnauthorizedAccessException("There is already an item with the same name.");
}
break;
case CreationCollisionOption.OpenIfExists:
if (existingItem is StorageFolder existingFolder)
{
return existingFolder;
}
if (existingItem is StorageFile)
{
throw new UnauthorizedAccessException("There is already a file with the same name.");
}
break;
case CreationCollisionOption.GenerateUniqueName:
folderName = await FindAvailableNumberedFolderNameAsync(folderName);
break;
default:
throw new ArgumentOutOfRangeException(nameof(option));
}
var directoryDocument = _directoryDocument.CreateDirectory(folderName);
return GetFromSafDocument(directoryDocument);
}, token));
}