Java 如何在Android上删除一个文件夹中的所有文件和文件夹
我使用此代码删除所有文件:Java 如何在Android上删除一个文件夹中的所有文件和文件夹,java,android,file-io,Java,Android,File Io,我使用此代码删除所有文件: File root = new File("root path"); File[] Files = root.listFiles(); if(Files != null) { int j; for(j = 0; j < Files.length; j++) { System.out.println(Files[j].getAbsolutePath()); System.out.println(Files[j].de
File root = new File("root path");
File[] Files = root.listFiles();
if(Files != null) {
int j;
for(j = 0; j < Files.length; j++) {
System.out.println(Files[j].getAbsolutePath());
System.out.println(Files[j].delete());
}
}
File root=新文件(“根路径”);
File[]Files=root.listFiles();
如果(文件!=null){
int j;
对于(j=0;j
当文件[j]
是文件夹时,它将删除false
我想删除文件夹及其所有子文件。我如何修改这个 最简单的方法是使用Apache Commons IO库
File dir = new File("root path");
FileUtils.deleteDirectory(dir);
请记住,这也将删除包含的目录
在gradle文件中添加这一行以使用Apache
compile 'org.apache.commons:commons-io:1.3.2'
您可以这样检查:
for(j = 0; j < Files.length; j++) {
if(file.isDirectory()){
for(File f : file.listFiles()){
System.out.println(Files[j].getAbsolutePath());
System.out.println(Files[j].delete());
}
else {
System.out.println(Files[j].getAbsolutePath());
System.out.println(Files[j].delete());
}
}
for(j=0;j
同时检查此链接
您可以尝试使用此代码删除文件和子文件
public void deleteFile(File f){
String[] flist=f.list();
for(int i=0;i<flist.length;i++){
System.out.println(" "+f.getAbsolutePath());
File temp=new File(f.getAbsolutePath()+"/"+flist[i]);
if(temp.isDirectory()){
deleteFile(temp) ;
temp.delete();
}else{
temp.delete();
}
public void deleteFile(文件f){
字符串[]flist=f.list();
对于(int i=0;iFile File File=新文件(“C:\\A\\B”);
字符串[]myFiles;
myFiles=file.list();
对于(inti=0;i对于您的情况,这非常有效
如果你想删除文件夹本身。(它不必是空的)。也可以用于文件
这段代码适合我。“imagesFolder”有一些文件和文件夹,而这些文件和文件夹又有文件
if (imagesFolder.isDirectory())
{
String[] children = imagesFolder.list(); //Children=files+folders
for (int i = 0; i < children.length; i++)
{
File file=new File(imagesFolder, children[i]);
if(file.isDirectory())
{
String[] grandChildren = file.list(); //grandChildren=files in a folder
for (int j = 0; j < grandChildren.length; j++)
new File(file, grandChildren[j]).delete();
file.delete(); //Delete the folder as well
}
else
file.delete();
}
}
if(imagesFolder.isDirectory())
{
String[]children=imagesFolder.list();//children=文件+文件夹
for(int i=0;i
如果storageDir是一个目录
for(File tempFile : storageDir.listFiles()) {
tempFile.delete();
}
#1
#2(根)
//删除文件夹及其内容
public static void DeleteFolder(File folder)
{
try
{
FileUtils.deleteDirectory(folder);
} catch (Exception ex)
{
Log.e(" Failed delete folder: ", ex.getMessage());
}
}
//仅删除文件夹内容
public static void DeleteFolderContents(File folder)
{
try
{
FileUtils.cleanDirectory(folder);
} catch (Exception ex)
{
Log.e(" Failed delete folder contents: ", ex.getMessage());
}
}
文档:rm-rf
比FileUtils.deleteDirectory
或自己递归删除目录更有效。
经过广泛的基准测试,我们发现使用rm-rf
比使用FileUtils.deleteDirectory
快数倍
当然,如果你有一个小的或简单的目录,这无关紧要,但在我们的例子中,我们有多个千兆字节和深度嵌套的子目录,使用FileUtils.deleteDirectory
需要10分钟,而使用rm-rf
只需要1分钟
下面是我们的粗略Java实现:
// Delete directory given and all subdirectories and files (i.e. recursively).
//
static public boolean deleteDirectory( File file ) throws IOException, InterruptedException {
if ( file.exists() ) {
String deleteCommand = "rm -rf " + file.getAbsolutePath();
Runtime runtime = Runtime.getRuntime();
Process process = runtime.exec( deleteCommand );
process.waitFor();
return true;
}
return false;
}
如果您正在处理大型或复杂的目录,那么值得一试。作为kotlin扩展函数,您可以这样做
fun File.deleteDirectoryFiles(){
this.listFiles().forEach {
if(it.isDirectory){
it.deleteDirectoryFiles()
}else{
it.delete()
}
}
this.delete()
}
那你就做吧
file.deleteDirectoryFiles()
可能重复:最好在答案中格式化代码段,而不是简单地链接链接。此外,请尝试准确解释您作为答案提供的内容。不要忘记将commons io jar添加到项目中。[apache commons jar链接在此]()为gradle Importt编译'org.apache.commons:commons io:1.3.2'//如果目录中有任何非空目录要删除,则此操作无效。直接fileOrDirectory.listFiles()如果读取文件时出现I/O错误,则
可能会返回null。这在以下文档中有说明:developer.android.com/reference/java/io/File.html#listFiles()
File mFile = new File(Environment.getExternalStorageDirectory() + "/folder");
try {
deleteFolder(mFile);
} catch (IOException e) {
Toast.makeText(getContext(), "Unable to delete folder", Toast.LENGTH_SHORT).show();
}
public void deleteFolder(File folder) throws IOException {
if (folder.isDirectory()) {
for (File ct : folder.listFiles()){
deleteFolder(ct);
}
}
if (!folder.delete()) {
throw new FileNotFoundException("Unable to delete: " + folder);
}
}
try {
Process p = Runtime.getRuntime().exec("su");
DataOutputStream outputStream = new DataOutputStream(p.getOutputStream());
outputStream.writeBytes("rm -Rf /system/file.txt\n");
outputStream.flush();
p.waitFor();
} catch (IOException | InterruptedException e) {
Toast.makeText(getContext(), e.getMessage(), Toast.LENGTH_SHORT).show();
}
public static void DeleteFolder(File folder)
{
try
{
FileUtils.deleteDirectory(folder);
} catch (Exception ex)
{
Log.e(" Failed delete folder: ", ex.getMessage());
}
}
public static void DeleteFolderContents(File folder)
{
try
{
FileUtils.cleanDirectory(folder);
} catch (Exception ex)
{
Log.e(" Failed delete folder contents: ", ex.getMessage());
}
}
// Delete directory given and all subdirectories and files (i.e. recursively).
//
static public boolean deleteDirectory( File file ) throws IOException, InterruptedException {
if ( file.exists() ) {
String deleteCommand = "rm -rf " + file.getAbsolutePath();
Runtime runtime = Runtime.getRuntime();
Process process = runtime.exec( deleteCommand );
process.waitFor();
return true;
}
return false;
}
fun File.deleteDirectoryFiles(){
this.listFiles().forEach {
if(it.isDirectory){
it.deleteDirectoryFiles()
}else{
it.delete()
}
}
this.delete()
}
file.deleteDirectoryFiles()