/// <summary>
/// verschiebt das Objekt (API level 14)
/// </summary>
/// <param name="storagenamesrc">z.B. "primary" oder "19F4-0903"</param>
/// <param name="volpathsrc">abs. Pfad im Volume</param>
/// <param name="storagenamenewparent">Zielvolume</param>
/// <param name="volpathnewparent">Zielverzeichnis</param>
/// <returns></returns>
public bool Move(string storagenamesrc, string volpathsrc, string storagenamenewparent, string volpathnewparent)
{
/*
* DocumentFile srcdoc = GetExistingDocumentFile(volpathsrc);
* DocumentFile dstdoc = GetDocumentFile(volpathdst, true); // Zielverzeichnis (wird notfalls erzeugt)
* Android.Net.Uri srcuri = srcdoc.Uri;
* Android.Net.Uri srcparenturi = srcdoc.ParentFile.Uri;
* Android.Net.Uri dstparenturi = dstdoc.Uri;
*/
DocumentFile dstdoc = GetDocumentFile(storagenamesrc, volpathnewparent, true); // Zielverzeichnis (wird notfalls erzeugt)
/*
* public static Uri moveDocument (ContentResolver content,
* Uri sourceDocumentUri, document with FLAG_SUPPORTS_MOVE
* Uri sourceParentDocumentUri, parent document of the document to move
* Uri targetParentDocumentUri) document which will become a new parent of the source document
* return the moved document, or null if failed.
*
* Moves the given document under a new parent.
* Added in API level 24; Deprecated in API level Q
*
* neu:
* ContentProviderClient provclient = Activity.ContentResolver.AcquireUnstableContentProviderClient(srcdoc.Uri.Authority);
* DocumentsContract.MoveDocument(provclient, srcdoc.Uri, srcparenturi.Uri, dstparentdoc.Uri);
*
* intern:
* Bundle inbundle = new Bundle();
* inbundle.PutParcelable(DocumentsContract.EXTRA_URI, srcdoc.Uri); "uri"
* inbundle.PutParcelable(DocumentsContract.EXTRA_PARENT_URI, srcparenturi.Uri); "parentUri"
* inbundle.PutParcelable(DocumentsContract.EXTRA_TARGET_URI, dstparentdoc.Uri); "android.content.extra.TARGET_URI"
* Bundle outbundle = provclient.Call(METHOD_MOVE_DOCUMENT, null, inbundle); "android:moveDocument"
* return outbundle.GetParcelable(DocumentsContract.EXTRA_URI); "uri"
*/
global::Android.Net.Uri newuri = DocumentsContract.MoveDocument(Activity.ContentResolver,
GetDocumentUriUsingTree(storagenamesrc, volpathsrc),
GetDocumentUriUsingTree(storagenamenewparent, Path.GetDirectoryName(volpathsrc)),
dstdoc.Uri);
System.Diagnostics.Debug.WriteLine("AndroidMove(" + storagenamesrc + ", " + volpathsrc + ", " + storagenamenewparent + ", " + volpathnewparent + ") = " + (newuri != null).ToString());
return(newuri != null);
}