我希望我的应用程序的用户能够删除DCIM文件夹(它位于SD卡上并包含子文件夹)。
这可能吗?如果可能,怎么可能?
我希望我的应用程序的用户能够删除DCIM文件夹(它位于SD卡上并包含子文件夹)。
这可能吗?如果可能,怎么可能?
当前回答
这里是一个非递归的实现,只是为了好玩:
/**
* Deletes the given folder and all its files / subfolders.
* Is not implemented in a recursive way. The "Recursively" in the name stems from the filesystem command
* @param root The folder to delete recursively
*/
public static void deleteRecursively(final File root) {
LinkedList<File> deletionQueue = new LinkedList<>();
deletionQueue.add(root);
while(!deletionQueue.isEmpty()) {
final File toDelete = deletionQueue.removeFirst();
final File[] children = toDelete.listFiles();
if(children == null || children.length == 0) {
// This is either a file or an empty directory -> deletion possible
toDelete.delete();
} else {
// Add the children before the folder because they have to be deleted first
deletionQueue.addAll(Arrays.asList(children));
// Add the folder again because we can't delete it yet.
deletionQueue.addLast(toDelete);
}
}
}
其他回答
//To delete all the files of a specific folder & subfolder
public static void deleteFiles(File directory, Context c) {
try {
for (File file : directory.listFiles()) {
if (file.isFile()) {
final ContentResolver contentResolver = c.getContentResolver();
String canonicalPath;
try {
canonicalPath = file.getCanonicalPath();
} catch (IOException e) {
canonicalPath = file.getAbsolutePath();
}
final Uri uri = MediaStore.Files.getContentUri("external");
final int result = contentResolver.delete(uri,
MediaStore.Files.FileColumns.DATA + "=?", new String[]{canonicalPath});
if (result == 0) {
final String absolutePath = file.getAbsolutePath();
if (!absolutePath.equals(canonicalPath)) {
contentResolver.delete(uri,
MediaStore.Files.FileColumns.DATA + "=?", new String[]{absolutePath});
}
}
if (file.exists()) {
file.delete();
if (file.exists()) {
try {
file.getCanonicalFile().delete();
} catch (IOException e) {
e.printStackTrace();
}
if (file.exists()) {
c.deleteFile(file.getName());
}
}
}
} else
deleteFiles(file, c);
}
} catch (Exception e) {
}
}
这是你的解决方案,它也将刷新画廊以及。
这里是一个非递归的实现,只是为了好玩:
/**
* Deletes the given folder and all its files / subfolders.
* Is not implemented in a recursive way. The "Recursively" in the name stems from the filesystem command
* @param root The folder to delete recursively
*/
public static void deleteRecursively(final File root) {
LinkedList<File> deletionQueue = new LinkedList<>();
deletionQueue.add(root);
while(!deletionQueue.isEmpty()) {
final File toDelete = deletionQueue.removeFirst();
final File[] children = toDelete.listFiles();
if(children == null || children.length == 0) {
// This is either a file or an empty directory -> deletion possible
toDelete.delete();
} else {
// Add the children before the folder because they have to be deleted first
deletionQueue.addAll(Arrays.asList(children));
// Add the folder again because we can't delete it yet.
deletionQueue.addLast(toDelete);
}
}
}
这是另一种(现代)解决方法。
public class FileUtils {
public static void delete(File fileOrDirectory) {
if(fileOrDirectory != null && fileOrDirectory.exists()) {
if(fileOrDirectory.isDirectory() && fileOrDirectory.listFiles() != null) {
Arrays.stream(fileOrDirectory.listFiles())
.forEach(FileUtils::delete);
}
fileOrDirectory.delete();
}
}
}
从API 26开始在Android上运行
public class FileUtils {
public static void delete(File fileOrDirectory) {
if(fileOrDirectory != null) {
delete(fileOrDirectory.toPath());
}
}
public static void delete(Path path) {
try {
if(Files.exists(path)) {
Files.walk(path)
.sorted(Comparator.reverseOrder())
.map(Path::toFile)
// .peek(System.out::println)
.forEach(File::delete);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static void deleteDirectory( File dir )
{
if ( dir.isDirectory() )
{
String [] children = dir.list();
for ( int i = 0 ; i < children.length ; i ++ )
{
File child = new File( dir , children[i] );
if(child.isDirectory()){
deleteDirectory( child );
child.delete();
}else{
child.delete();
}
}
dir.delete();
}
}
短柯尔丁版
fun File.deleteDirectory(): Boolean {
return if (exists()) {
listFiles()?.forEach {
if (it.isDirectory) {
it.deleteDirectory()
} else {
it.delete()
}
}
delete()
} else false
}
更新
Kotlin标准库函数
file.deleteRecursively()