blocks|key|157809|text|最简单的方法是使用Apache+Commons+IO库中的FileUtils.deleteDirectory。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|157810|File+dir+=+new+File("root+path");
FileUtils.deleteDirectory(dir);|code-block|syntax|javascript|157811|请记住，这也会删除包含目录。|157812|在gradle文件中添加以下行，以使Apache|157813|compile+'org.apache.commons:commons-io:1.3.2'++|157814|entityMap|0|LINK|mutability|MUTABLE|url|https://commons.apache.org/proper/commons-io/javadocs/api-1.4/org/apache/commons/io/FileUtils.html#deleteDirectory(java.io.File)^0|T|P|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|C|$]]|$1|M|3|N|5|F|7|13|8|@]|9|@]|C|$G|H]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

Simplest way would be to use <a href="https://commons.apache.org/proper/commons-io/javadocs/api-1.4/org/apache/commons/io/FileUtils.html#deleteDirectory(java.io.File)" rel="noreferrer">FileUtils.deleteDirectory</a> from the Apache Commons IO library.

<pre><code>File dir = new File("root path");
FileUtils.deleteDirectory(dir);
</code></pre>

Bear in mind this will also delete the containing directory.

Add this line in gradle file to have Apache 

<pre><code>compile 'org.apache.commons:commons-io:1.3.2' 
</code></pre>

blocks|key|375687|text|您可以像这样检查：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|375688|for(j+=+0;+j+<+Files.length;+j%2B%2B)+{

++++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());
++++}
}|code-block|syntax|javascript|375689|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can check like this:

<pre><code>for(j = 0; j &lt; 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());
 }
}
</code></pre>

blocks|key|157853|text|也可以在Delete+folder+from+internal+storage+in+android?中查看此链接。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|157854|void+deleteRecursive(File+fileOrDirectory)+{

++++if+(fileOrDirectory.isDirectory())
++++++++for+(File+child+:+fileOrDirectory.listFiles())
++++++++++++deleteRecursive(child);

++++fileOrDirectory.delete();

}|code-block|syntax|javascript|157855|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/13410949/how-to-delete-folder-from-internal-storage-in-android^0|4|1B|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Check this link also <a href="https://stackoverflow.com/questions/13410949/how-to-delete-folder-from-internal-storage-in-android">Delete folder from internal storage in android?</a>.

<pre><code>void deleteRecursive(File fileOrDirectory) {

 if (fileOrDirectory.isDirectory())
 for (File child : fileOrDirectory.listFiles())
 deleteRecursive(child);

 fileOrDirectory.delete();

}
</code></pre>

blocks|key|375717|text|您可以尝试使用此代码删除文件和子文件|type|unstyled|depth|inlineStyleRanges|entityRanges|data|375718|public+void+deleteFile(File+f){
String[]+flist=f.list();
for(int+i=0;i<flist.length;i%2B%2B){
++++System.out.println("+"%2Bf.getAbsolutePath());
++++File+temp=new+File(f.getAbsolutePath()%2B"/"%2Bflist[i]);
++++if(temp.isDirectory()){
+++++++deleteFile(temp)+;
+++++++temp.delete();
++++}else{
++++temp.delete();
++++}|code-block|syntax|javascript|375719|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

you can try this code to delete files and subfiles

<pre><code>public void deleteFile(File f){
String[] flist=f.list();
for(int i=0;i&lt;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();
 }
</code></pre>

blocks|key|375737|text|File+file+=+new+File("C:\\A\\B");++++++++
++++String[]+myFiles;++++++

+++++myFiles+=+file.list();++
+++++for+(int+i=0;+i<myFiles.length;+i%2B%2B)+{++
+++++++++File+myFile+=+new+File(file,+myFiles[i]);+++
+++++++++myFile.delete();++
+++++}++
B.delete();//+deleting+directory.|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|375738|您可以这样编写方法:删除dir.Returns下的所有文件和子目录true如果所有的删除都是successful.If，则删除失败，该方法停止尝试删除并返回false。|unstyled|375739|public+static+boolean+deleteDir(File+dir)+{
++++if+(dir.isDirectory())+{
++++++++String[]+children+=+dir.list();
++++++++for+(int+i=0;+i<children.length;+i%2B%2B)+{
++++++++++++boolean+success+=+deleteDir(new+File(dir,+children[i]));
++++++++++++if+(!success)+{
++++++++++++++++return+false;
++++++++++++}
++++++++}
++++}

++++//+The+directory+is+now+empty+so+delete+it
++++return+dir.delete();
}|375740|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>File file = new File("C:\\A\\B"); 
 String[] myFiles; 

 myFiles = file.list(); 
 for (int i=0; i&lt;myFiles.length; i++) { 
 File myFile = new File(file, myFiles[i]); 
 myFile.delete(); 
 } 
B.delete();// deleting directory.
</code></pre>

You can write method like this way :Deletes all files and subdirectories under dir.Returns true if all deletions were successful.If a deletion fails, the method stops attempting to delete and returns false.

<pre><code>public static boolean deleteDir(File dir) {
 if (dir.isDirectory()) {
 String[] children = dir.list();
 for (int i=0; i&lt;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();
}
</code></pre>

blocks|key|157908|text|对于您的情况，这完全适用于http://commons.apache.org/proper/commons-io/apidocs/org/apache/commons/io/FileUtils.html#cleanDirectory(java.io.File)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|157909|File+dir+=+new+File("dir_path");
if(dir.exists()+&&+dir.isDirectory())+{
++++FileUtils.cleanDirectory(dir);
}|code-block|syntax|javascript|157910|如果你想删除文件夹本身。(它不必为空)。也可以用于文件。|157911|http://commons.apache.org/proper/commons-io/apidocs/org/apache/commons/io/FileUtils.html#forceDelete(java.io.File)|157912|File+dir+=+new+File("dir_path");
if(dir.exists())+{
++++FileUtils.forceDelete(dir);
}|157913|entityMap|0|LINK|mutability|MUTABLE|url|http://commons.apache.org/proper/commons-io/apidocs/org/apache/commons/io/FileUtils.html#cleanDirectory(java.io.File)|1^0|D|39|0|0|0|0|0|36|1|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|F|7|11|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|12|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|13|8|@]|9|@$A|14|B|15|1|16]]|C|$]]|$1|M|3|N|5|F|7|17|8|@]|9|@]|C|$G|H]]|$1|O|3|-4|5|6|7|18|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]|W|$5|R|S|T|C|$U|L]]]]

For your case, this works perfectly
<a href="http://commons.apache.org/proper/commons-io/apidocs/org/apache/commons/io/FileUtils.html#cleanDirectory(java.io.File)" rel="noreferrer">http://commons.apache.org/proper/commons-io/apidocs/org/apache/commons/io/FileUtils.html#cleanDirectory(java.io.File)</a>

<pre><code>File dir = new File("dir_path");
if(dir.exists() &amp;&amp; dir.isDirectory()) {
 FileUtils.cleanDirectory(dir);
}
</code></pre>

If you wanna delete the folder itself. (It does not have to be empty). Can be used for files too.

<a href="http://commons.apache.org/proper/commons-io/apidocs/org/apache/commons/io/FileUtils.html#forceDelete(java.io.File)" rel="noreferrer">http://commons.apache.org/proper/commons-io/apidocs/org/apache/commons/io/FileUtils.html#forceDelete(java.io.File)</a>

<pre><code>File dir = new File("dir_path");
if(dir.exists()) {
 FileUtils.forceDelete(dir);
}
</code></pre>

blocks|key|375783|text|这段代码适用于我。"imagesFolder“包含一些文件和文件夹，而这些文件和文件夹又包含文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|375784|++if+(imagesFolder.isDirectory())
++{
+++++++String[]+children+=+imagesFolder.list();+//Children=files%2Bfolders
+++++++for+(int+i+=+0;+i+<+children.length;+i%2B%2B)
+++++++{
+++++++++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%2B%2B)
++++++++++new+File(file,+grandChildren[j]).delete();
++++++++++file.delete();++++++++++++++++++++++++//Delete+the+folder+as+well
+++++++++}
+++++++++else
+++++++++file.delete();
++++++}
++}|code-block|syntax|javascript|375785|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This code works for me. "imagesFolder" has some files and folders which in turn has files.

<pre><code> if (imagesFolder.isDirectory())
 {
 String[] children = imagesFolder.list(); //Children=files+folders
 for (int i = 0; i &lt; 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 &lt; grandChildren.length; j++)
 new File(file, grandChildren[j]).delete();
 file.delete(); //Delete the folder as well
 }
 else
 file.delete();
 }
 }
</code></pre>

blocks|key|157968|text|#1|type|unstyled|depth|inlineStyleRanges|entityRanges|data|157969|File+mFile+=+new+File(Environment.getExternalStorageDirectory()+%2B+"/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:+"+%2B+folder);
++++}
}|code-block|syntax|javascript|157970|#2+(根)|157971|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+%7C+InterruptedException+e)+{
+++++++Toast.makeText(getContext(),+e.getMessage(),+Toast.LENGTH_SHORT).show();
++++}|157972|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<h1>#1</h1>

<pre><code>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);
 }
}
</code></pre>

<h3>#2 (Root)</h3>

<pre><code>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();
 }
</code></pre>

blocks|key|157977|text|//删除文件夹及其内容|type|unstyled|depth|inlineStyleRanges|entityRanges|data|157978|public+static+void+DeleteFolder(File+folder)
{
++++try
++++{
++++++++FileUtils.deleteDirectory(folder);
++++}+catch+(Exception+ex)
++++{
++++++++Log.e("+Failed+delete+folder:+",+ex.getMessage());
++++}
}|code-block|syntax|javascript|157979|//仅删除文件夹内容|157980|public+static+void+DeleteFolderContents(File+folder)
{
++++try
++++{
++++++++FileUtils.cleanDirectory(folder);
++++}+catch+(Exception+ex)
++++{
++++++++Log.e("+Failed+delete+folder+contents:+",+ex.getMessage());
++++}
}|157981|文档：org.apache.commons.io.FileUtils.cleanDirectory|offset|length|157982|entityMap|0|LINK|mutability|MUTABLE|url|http://commons.apache.org/proper/commons-io/javadocs/api-2.5/org/apache/commons/io/FileUtils.html#cleanDirectory(java.io.File)^0|0|0|0|0|3|1A|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|10|8|@]|9|@$M|11|N|12|1|13]]|A|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

// Delete folder and its contents 

<pre><code>public static void DeleteFolder(File folder)
{
 try
 {
 FileUtils.deleteDirectory(folder);
 } catch (Exception ex)
 {
 Log.e(" Failed delete folder: ", ex.getMessage());
 }
}
</code></pre>

// Delete folder contents only

<pre><code>public static void DeleteFolderContents(File folder)
{
 try
 {
 FileUtils.cleanDirectory(folder);
 } catch (Exception ex)
 {
 Log.e(" Failed delete folder contents: ", ex.getMessage());
 }
}
</code></pre>

Docs: <a href="http://commons.apache.org/proper/commons-io/javadocs/api-2.5/org/apache/commons/io/FileUtils.html#cleanDirectory(java.io.File)" rel="nofollow noreferrer">org.apache.commons.io.FileUtils.cleanDirectory</a>

blocks|key|375879|text|作为kotlin扩展函数，您可以这样做|type|unstyled|depth|inlineStyleRanges|entityRanges|data|375880|fun+File.deleteDirectoryFiles(){
++++this.listFiles().forEach+{
++++++++if(it.isDirectory){
++++++++++++it.deleteDirectoryFiles()
++++++++}else{
++++++++++++it.delete()
++++++++}
++++}

++++this.delete()
}|code-block|syntax|javascript|375881|然后你就可以这样做|375882|file.deleteDirectoryFiles()|375883|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

As a kotlin extension function you can do this
<pre><code>fun File.deleteDirectoryFiles(){
 this.listFiles().forEach {
 if(it.isDirectory){
 it.deleteDirectoryFiles()
 }else{
 it.delete()
 }
 }

 this.delete()
}
</code></pre>
Then you can just do
<pre><code>file.deleteDirectoryFiles()
</code></pre>

I use this code to delete all files:

<pre><code>File root = new File("root path");
File[] Files = root.listFiles();
if(Files != null) {
 int j;
 for(j = 0; j &lt; Files.length; j++) {
 System.out.println(Files[j].getAbsolutePath());
 System.out.println(Files[j].delete());
 }
}
</code></pre>

It will delete false where <code>Files[j]</code> is a folder.

I want to delete folder and all its sub files. 
How can I modify this?

How to delete all files and folders in one folder on Android

我使用以下代码删除所有文件：File root = new File("root path");File[] Files = root.listFiles();if(Files != null) { int j; for(j = 0; j < Files.length; j++) { Syst...

问如何在Android上删除一个文件夹中的所有文件和文件夹
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