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
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
其他回答
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
最快最简单的方法:
public static boolean deleteFolder(File removableFolder) {
File[] files = removableFolder.listFiles();
if (files != null && files.length > 0) {
for (File file : files) {
boolean success;
if (file.isDirectory())
success = deleteFolder(file);
else success = file.delete();
if (!success) return false;
}
}
return removableFolder.delete();
}
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();
}
}
}
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();
}
}
}
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);
}
}
}