/// <summary>
/// List contents of folder via storage access framework (used for Android/data/)
/// </summary>
/// <param name="uri"></param>
/// <param name="path">Optional path</param>
/// <returns></returns>
public List <FolderChildren> GetFolderChildren(Uri uri, string path)
{
string[] projection =
{
DocumentsContract.Document.ColumnDocumentId,
DocumentsContract.Document.ColumnLastModified
};
var newPath = DocumentsContract.GetTreeDocumentId(uri) + $"/{path}";
var children = DocumentsContract.BuildChildDocumentsUriUsingTree(uri, newPath);
List <FolderChildren> folderChildren = new List <FolderChildren>();
//string fileSelectionQuery = null;
//Bundle? queryArgs = new Bundle();
/*if (fileSelection != null)
* {
* var sb = new StringBuilder();
* foreach (var _ in fileSelection)
* {
* sb.Append("?,");
* }
*
* var inQuery = sb.ToString().TrimEnd(',');
* fileSelectionQuery = DocumentsContract.Document.ColumnDocumentId + $" IN ({inQuery})";
* queryArgs.PutString(ContentResolver.QueryArgSqlSelection, fileSelectionQuery);
* queryArgs.PutStringArray(ContentResolver.QueryArgSqlSelectionArgs, fileSelection);
* }*/// https://github.com/xamarin/xamarin-android/issues/5788
if (_folderCache.ContainsKey(children !.ToString()))
{
return(_folderCache[children.ToString() !]);
private List <Track> UpdateDirectoryEntries(Android.Net.Uri uri)
{
var contentResolver = Instance.ContentResolver;
var childrenUri = DocumentsContract.BuildChildDocumentsUriUsingTree(uri, DocumentsContract.GetTreeDocumentId(uri));
string[] projection =
{
MediaStore.Audio.AudioColumns.Data,
MediaStore.Audio.AudioColumns.Title,
MediaStore.Audio.AudioColumns.Album,
MediaStore.Audio.ArtistColumns.Artist,
DocumentsContract.Document.ColumnDisplayName,
DocumentsContract.Document.ColumnMimeType,
DocumentsContract.Document.ColumnDocumentId,
};
var childCursor = contentResolver.Query(childrenUri, projection, MediaStore.Audio.AudioColumns.Data + " like ? ", new String[] { "%utm%" }, null);
try
{
var findTracks = new List <Track>();
while (childCursor.MoveToNext())
{
string path = childCursor.GetString(0);
string title = childCursor.GetString(1);
string album = childCursor.GetString(2);
string artist = childCursor.GetString(3);
string fileName = childCursor.GetString(4);
string mime = childCursor.GetString(5);
string docId = childCursor.GetString(6);
var childUri = DocumentsContract.BuildChildDocumentsUriUsingTree(uri, docId);
//var childUri = DocumentsContract.Bui(childrenUri, docId);
if (mime.Contains("audio"))
{
var file = new Java.IO.File(childUri.Path);
var split = file.Path.Split(":");
path = split[1];
var track = new Track
{
FileName = fileName,
AlternativePathObject = childUri,//path + Java.IO.File.Separator + fileName,
};
findTracks.Add(track);
}
}
return(findTracks);
}
catch (Exception)
{
return(null);
}
}
// Methods
private (bool successful, List <AndroidFile> files) RequestFiles(Uri directoryUri)
{
bool successful;
var collection = new List <AndroidFile>();
try
{
var childrenUri = DocumentsContract.BuildChildDocumentsUriUsingTree(
directoryUri, DocumentsContract.GetTreeDocumentId(directoryUri));
var cursor = ContentResolver.Query(
childrenUri, new[]
{
DocumentsContract.Document.ColumnDisplayName,
DocumentsContract.Document.ColumnDocumentId
}, null, null, null);
try
{
while (cursor.MoveToNext())
{
(var name, var uri) =
(cursor.GetString(0), DocumentsContract.BuildDocumentUriUsingTree(directoryUri,
cursor.GetString(1)));
if (Extensions.Any(ext => name.EndsWith(ext, StringComparison.CurrentCultureIgnoreCase)))
{
collection.Add(new AndroidFile {
Name = name, Uri = uri
});
}
}
successful = true;
}
finally
{
cursor.Close();
}
}
catch (Java.Lang.Exception e)
{
Log.Debug("??", e, e.Message);
successful = false;
}
return(successful, collection);
}
/// <summary>
/// Updates the current directory of the uri passed as an argument and its children directories.
/// And updates the instance's <see cref="Android.Support.V7.Widget.RecyclerView"/> depending
/// on the contents of the children.
/// </summary>
/// <param name="uri">The uri of the current directory.</param>
void UpdateDirectoryEntries(Android.Net.Uri uri)
{
var contentResolver = Activity.ContentResolver;
var docUri = DocumentsContract.BuildDocumentUriUsingTree(uri,
DocumentsContract.GetTreeDocumentId(uri));
var childrenUri = DocumentsContract.BuildChildDocumentsUriUsingTree(uri,
DocumentsContract.GetTreeDocumentId(uri));
var docCursor = contentResolver.Query(docUri, new [] {
DocumentsContract.Document.ColumnDisplayName,
DocumentsContract.Document.ColumnMimeType
}, null, null, null);
try {
while (docCursor.MoveToNext())
{
Log.Debug(TAG, "found doc =" + docCursor.GetString(0) + ", mime=" + docCursor
.GetString(1));
mCurrentDirectoryUri = uri;
mCurrentDirectoryTextView.Text = docCursor.GetString(0);
mCreateDirectoryButton.Enabled = true;
}
} finally {
CloseQuietly(docCursor);
}
var childCursor = contentResolver.Query(childrenUri, new [] {
DocumentsContract.Document.ColumnDisplayName,
DocumentsContract.Document.ColumnMimeType
}, null, null, null);
try {
List <DirectoryEntry> directoryEntries = new List <DirectoryEntry> ();
while (childCursor.MoveToNext())
{
Log.Debug(TAG, "found child=" + childCursor.GetString(0) + ", mime=" + childCursor
.GetString(1));
DirectoryEntry entry = new DirectoryEntry();
entry.fileName = childCursor.GetString(0);
entry.mimeType = childCursor.GetString(1);
directoryEntries.Add(entry);
}
mAdapter.SetDirectoryEntries(directoryEntries);
mAdapter.NotifyDataSetChanged();
} finally {
CloseQuietly(childCursor);
}
}
void UpdateDirectoryEntries(Uri uri)
{
directoryEntries.Clear();
var contentResolver = Activity.ContentResolver;
Uri docUri = DocumentsContract.BuildDocumentUriUsingTree(uri, DocumentsContract.GetTreeDocumentId(uri));
Uri childrenUri = DocumentsContract.BuildChildDocumentsUriUsingTree(uri, DocumentsContract.GetTreeDocumentId(uri));
try {
using (ICursor docCursor = contentResolver.Query(docUri, DIRECTORY_SELECTION, null, null, null)) {
while (docCursor != null && docCursor.MoveToNext())
{
currentDirectoryTextView.Text = docCursor.GetString(
docCursor.GetColumnIndex(DocumentsContract.Document.ColumnDisplayName));
}
}
} catch {
}
try {
using (ICursor childCursor = contentResolver.Query(childrenUri, DIRECTORY_SELECTION, null, null, null)) {
while (childCursor != null && childCursor.MoveToNext())
{
var entry = new DirectoryEntry();
entry.FileName = childCursor.GetString(childCursor.GetColumnIndex(DocumentsContract.Document.ColumnDisplayName));
entry.MimeType = childCursor.GetString(childCursor.GetColumnIndex(DocumentsContract.Document.ColumnMimeType));
directoryEntries.Add(entry);
}
}
if (directoryEntries.Count == 0)
{
nothingInDirectoryTextView.Visibility = ViewStates.Visible;
}
else
{
nothingInDirectoryTextView.Visibility = ViewStates.Gone;
}
adapter.DirectoryEntries = directoryEntries;
adapter.NotifyDataSetChanged();
} catch {
}
}
private StorageEntryBase[] GetEntriesImpl(string searchPattern = null)
{
var itemProperties = new List <StorageEntryBase>();
var childrenUri = DocumentsContract.BuildChildDocumentsUriUsingTree(AndroidUri, DocumentsContract.GetDocumentId(AndroidUri));
var projection = new string[] {
DocumentsContract.Document.ColumnDocumentId,
DocumentsContract.Document.ColumnDisplayName,
DocumentsContract.Document.ColumnMimeType,
DocumentsContract.Document.ColumnSize,
DocumentsContract.Document.ColumnLastModified
};
//build searchPattern
string selection = null;
string[] selectionArgs = null;
var regXpattern = searchPattern != null?Storage.WildcardToRegex(searchPattern) : null;
//it looks doesn't supported for storage
//if (!string.IsNullOrEmpty(searchPattern))
//{
// selection = $"{DocumentsContract.Document.ColumnDocumentId}=?";
// selectionArgs = new string[] { searchPattern.Replace("*", "%") };
//}
//run the query
using (var cursor = Context.ContentResolver.Query(childrenUri, projection, selection, selectionArgs, null))
{
while (cursor.MoveToNext())
{
var documentId = cursor.GetString(0);
var name = cursor.GetString(1);
if (regXpattern != null && !Regex.IsMatch(name, regXpattern))
{
continue;
}
StreamAttributes attribute = 0;
if (!string.IsNullOrEmpty(name) && name[0] == '.')
{
attribute |= StreamAttributes.Hidden;
}
itemProperties.Add(
new StorageEntryBase()
{
Name = name,
Uri = AndroidUriToUri(DocumentsContract.BuildDocumentUriUsingTree(AndroidUri, documentId)),
IsStorage = cursor.GetString(2) == DocumentsContract.Document.MimeTypeDir,
Size = long.Parse(cursor.GetString(3)),
LastWriteTime = cursor.GetString(4) != null ? JavaTimeStampToDateTime(double.Parse(cursor.GetString(4))) : DateTime.Now,
Attributes = attribute,
});
if (!string.IsNullOrEmpty(searchPattern))
{
break;
}
}
cursor.Close();
}
return(itemProperties.ToArray());
}
/// <summary>
/// Use DocumentsContract API to read the file structure at the given location iteratively
/// includes children
///
/// from https://stackoverflow.com/questions/41096332/issues-traversing-through-directory-hierarchy-with-android-storage-access-framew\
/// </summary>
private void DocumentsContractGetFilesFromSelectedFolder()
{
// build the children structure of the root directory
var childrenUri = DocumentsContract.BuildChildDocumentsUriUsingTree(
_userSelectedDirectory,
DocumentsContract.GetTreeDocumentId(_userSelectedDirectory)
);
// this stack is used in processing subsequent subdirectories
// when we encounter one in traversing, push it on the stack to be processed
// we continue until this stack is empty
//
// NOTE: stacks are LIFO, therefore this will produce a depth-first approach
Stack <Android.Net.Uri> dirNodes = new Stack <Android.Net.Uri>();
dirNodes.Push(childrenUri);
// used to keep track of how many directories we've traversed so far
// this only works because we know the structure of the directory!!!
int i = 0;
while (dirNodes.Count != 0)
{
// get the next subdirectory
dirNodes.TryPop(out childrenUri);
// using this sub directory URI, query it for document information
// the current seach finds all documents in the tree and returns the below columns: ID, Name, and Mime-type
// searches can be customized using remaining three arguments (currently null which is why we return everything)
var cursor = this.ContentResolver.Query(
childrenUri,
new string[] { DocumentsContract.Document.ColumnDocumentId, DocumentsContract.Document.ColumnDisplayName, DocumentsContract.Document.ColumnMimeType },
null, null, null
);
// for each of the documents returned from our search,
while (cursor.MoveToNext())
{
var docId = cursor.GetString(0);
var name = cursor.GetString(1);
var mime = cursor.GetString(2);
// only add the text files we've added
// this is just for demonstration purposes
if (mime == "text/plain")
{
// TODO: figure out a way to get directory (aka parent) name here
// Add the file name to the list of files found so far
_filenames.Add($"Director {i}/{name}");
}
// if this is a directory, push its URI to the directory nodes stack for later processing
else if (mime == DocumentsContract.Document.MimeTypeDir)
{
dirNodes.Push(
DocumentsContract.BuildChildDocumentsUriUsingTree(
_parentUri,
docId));
}
}
++i;
// cleanup cursor
cursor.Dispose();
}
return;
}
