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
从目录中删除所有文件的简单方法:
它是一个通用函数,用于删除目录中的所有图像
deleteAllImageFile(背景);
public static void deleteAllFile(Context context) {
File directory = context.getExternalFilesDir(null);
if (directory.isDirectory()) {
for (String fileName: file.list()) {
new File(file,fileName).delete();
}
}
}
其他回答
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);
}
}
}
看到android.os。FileUtils,它隐藏在API 21上
public static boolean deleteContents(File dir) {
File[] files = dir.listFiles();
boolean success = true;
if (files != null) {
for (File file : files) {
if (file.isDirectory()) {
success &= deleteContents(file);
}
if (!file.delete()) {
Log.w("Failed to delete " + file);
success = false;
}
}
}
return success;
}
来源:https://android.googlesource.com/platform/frameworks/base/ + /主/核心/ java / android / os / FileUtils.java # 414
这种方法适用于只包含文件的文件夹,但如果您正在寻找还包含子文件夹的场景,则需要递归
此外,您应该捕获返回的返回值,以确保允许您删除该文件
,包括
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
在你的清单上
void DeleteRecursive(File dir)
{
Log.d("DeleteRecursive", "DELETEPREVIOUS TOP" + dir.getPath());
if (dir.isDirectory())
{
String[] children = dir.list();
for (int i = 0; i < children.length; i++)
{
File temp = new File(dir, children[i]);
if (temp.isDirectory())
{
Log.d("DeleteRecursive", "Recursive Call" + temp.getPath());
DeleteRecursive(temp);
}
else
{
Log.d("DeleteRecursive", "Delete File" + temp.getPath());
boolean b = temp.delete();
if (b == false)
{
Log.d("DeleteRecursive", "DELETE FAIL");
}
}
}
}
dir.delete();
}
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();
}
}
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();
}
}
}