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
private static 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]);
deleteRecursive(temp);
}
}
if (dir.delete() == false)
{
Log.d("DeleteRecursive", "DELETE FAIL");
}
}
我们可以使用命令行参数删除整个文件夹及其内容。
public static void deleteFiles(String path) {
File file = new File(path);
if (file.exists()) {
String deleteCmd = "rm -r " + path;
Runtime runtime = Runtime.getRuntime();
try {
runtime.exec(deleteCmd);
} catch (IOException e) { }
}
}
以上代码的使用示例:
deleteFiles("/sdcard/uploads/");
这(尝试删除所有子文件和子目录,包括提供的目录):
如果是文件,删除 如果是空目录,请删除 如果不是空目录,再次调用删除子目录,重复1到3
例子:
File externalDir = Environment.getExternalStorageDirectory()
Utils.deleteAll(externalDir); //BE CAREFUL.. Will try and delete ALL external storage files and directories
访问“外部存储目录”需要具备以下权限:
(使用ContextCompat。checkSelfPermission和ActivityCompat.requestPermissions)
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
递归方法:
public static boolean deleteAll(File file) {
if (file == null || !file.exists()) return false;
boolean success = true;
if (file.isDirectory()) {
File[] files = file.listFiles();
if (files != null && files.length > 0) {
for (File f : files) {
if (f.isDirectory()) {
success &= deleteAll(f);
}
if (!f.delete()) {
Log.w("deleteAll", "Failed to delete " + f);
success = false;
}
}
} else {
if (!file.delete()) {
Log.w("deleteAll", "Failed to delete " + file);
success = false;
}
}
} else {
if (!file.delete()) {
Log.w("deleteAll", "Failed to delete " + file);
success = false;
}
}
return success;
}
如果你不需要递归删除东西,你可以尝试这样做:
File file = new File(context.getExternalFilesDir(null), "");
if (file != null && file.isDirectory()) {
File[] files = file.listFiles();
if(files != null) {
for(File f : files) {
f.delete();
}
}
}
我知道的最安全的代码:
private boolean recursiveRemove(File file) {
if(file == null || !file.exists()) {
return false;
}
if(file.isDirectory()) {
File[] list = file.listFiles();
if(list != null) {
for(File item : list) {
recursiveRemove(item);
}
}
}
if(file.exists()) {
file.delete();
}
return !file.exists();
}
检查文件是否存在,处理空值,检查目录是否被实际删除