You mention scoped storage. I was looking for a way to update some attributes like creation date, modificatio date... of files copied/created through the Storage Access Framework.
This requires also the uses of DocumentsContract, DocumentFiles
According to the doc, All columns are read-only to client applications
However, what I did to update the attributes of the files I created with DocumentsContract.createDocument was to convert the Uri to a path on the filesystem. And then to directly update the attributes on these files this way:
// sourceUri & targetUri reference tree Uris
Path inFilePath = Paths.get(FileUtil.getFullDocIdPathFromTreeUri(sourceUri, context));
Path outFilePath = Paths.get(FileUtil.getFullDocIdPathFromTreeUri(targetUri, context));
BasicFileAttributes inAttrs = Files.readAttributes(inFilePath, BasicFileAttributes.class);
Files.getFileAttributeView(outFilePath, BasicFileAttributeView.class).setTimes(inAttrs.lastModifiedTime(), inAttrs.lastAccessTime(), inAttrs.creationTime());
FileUtil class (adapted from: this PullRequest https://github.com/nzbget/android/pull/12/files which references also https://stackoverflow.com/a/36162691)
package com......;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.content.Context;
import android.net.Uri;
import android.os.Build;
import android.os.storage.StorageManager;
import android.provider.DocumentsContract;
import androidx.annotation.Nullable;
import androidx.documentfile.provider.DocumentFile;
import java.io.File;
import java.io.FileNotFoundException;
import java.lang.reflect.Array;
import java.lang.reflect.Method;
public final class FileUtil {
private static final String PRIMARY_VOLUME_NAME = "primary";
public static String getFullDocIdPathFromTreeUri(@Nullable final Uri treeUri, Context con) {
if (treeUri == null) return null;
String volumePath = getVolumePath(getVolumeIdFromTreeUri(treeUri),con);
if (volumePath == null) return File.separator;
if (volumePath.endsWith(File.separator))
volumePath = volumePath.substring(0, volumePath.length() - 1);
String documentPath = getDocumentPathFromTreeUri(treeUri);
if (documentPath.endsWith(File.separator))
documentPath = documentPath.substring(0, documentPath.length() - 1);
if (documentPath.length() > 0) {
if (documentPath.startsWith(File.separator))
return volumePath + documentPath;
else
return volumePath + File.separator + documentPath;
}
else return volumePath;
}
@SuppressLint("ObsoleteSdkInt")
private static String getVolumePath(final String volumeId, Context context) {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) return null;
try {
StorageManager mStorageManager =
(StorageManager) context.getSystemService(Context.STORAGE_SERVICE);
Class<?> storageVolumeClazz = Class.forName("android.os.storage.StorageVolume");
Method getVolumeList = mStorageManager.getClass().getMethod("getVolumeList");
Method getUuid = storageVolumeClazz.getMethod("getUuid");
Method getPath = storageVolumeClazz.getMethod("getPath");
Method isPrimary = storageVolumeClazz.getMethod("isPrimary");
Object result = getVolumeList.invoke(mStorageManager);
final int length = Array.getLength(result);
for (int i = 0; i < length; i++) {
Object storageVolumeElement = Array.get(result, i);
String uuid = (String) getUuid.invoke(storageVolumeElement);
Boolean primary = (Boolean) isPrimary.invoke(storageVolumeElement);
// primary volume?
if (primary && PRIMARY_VOLUME_NAME.equals(volumeId))
return (String) getPath.invoke(storageVolumeElement);
// other volumes?
if (uuid != null && uuid.equals(volumeId))
return (String) getPath.invoke(storageVolumeElement);
}
// not found.
return null;
} catch (Exception ex) {
return null;
}
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public static String getVolumeIdFromTreeUri(final Uri treeUri) {
final String docId = DocumentsContract.getTreeDocumentId(treeUri);
final String[] split = docId.split(":");
if (split.length > 0) return split[0];
else return null;
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private static String getDocumentPathFromTreeUri(final Uri treeUri) {
//final String docId = DocumentsContract.getTreeDocumentId(treeUri);
final String docId = DocumentsContract.getDocumentId(treeUri);
final String[] split = docId.split(":");
if ((split.length >= 2) && (split[1] != null)) return split[1];
else return File.separator;
}
}
Edit of 2021-03-30
If you have targetSDK >= 29, you might encounter an "AccessDeniedException" while setting the timestamps. To avoid this, you may have a look at the solutions here on stackoverflow summarized below:
- For Android 10 support, put this
android:requestLegacyExternalStorage="true" in the Manifest.
- For Android 11, you need MANAGE_EXTERNAL_STORAGE permission and Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION (some code example is in a github commit
