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
使用以下方法删除包含文件的整个主目录及其子目录。再次调用此方法后,调用主目录的delete()目录。
// For to Delete the directory inside list of files and inner Directory
public static boolean deleteDir(File dir) {
if (dir.isDirectory()) {
String[] children = dir.list();
for (int i=0; i<children.length; i++) {
boolean success = deleteDir(new File(dir, children[i]));
if (!success) {
return false;
}
}
}
// The directory is now empty so delete it
return dir.delete();
}
其他回答
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()
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();
}
}
根据文档:
如果此抽象路径名不表示目录,则此方法返回null。
所以你应该检查listFiles是否为空,如果不是则继续
boolean deleteDirectory(File path) {
if(path.exists()) {
File[] files = path.listFiles();
if (files == null) {
return false;
}
for (File file : files) {
if (file.isDirectory()) {
deleteDirectory(file);
} else {
boolean wasSuccessful = file.delete();
if (wasSuccessful) {
Log.i("Deleted ", "successfully");
}
}
}
}
return(path.delete());
}
让我告诉你第一件事你不能删除DCIM文件夹,因为它是一个系统文件夹。当你在手机上手动删除它时,它会删除该文件夹的内容,但不会删除DCIM文件夹。您可以通过以下方法删除其内容:
根据评论更新
File dir = new File(Environment.getExternalStorageDirectory()+"Dir_name_here");
if (dir.isDirectory())
{
String[] children = dir.list();
for (int i = 0; i < children.length; i++)
{
new File(dir, children[i]).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);
}
}
}