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

Question

I use this code to delete all files:

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());
    }
}

It will delete false where Files[j] is a folder.

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

Solution 1

Simplest way would be to use FileUtils.deleteDirectory from the Apache Commons IO library.

File dir = new File("root path");
FileUtils.deleteDirectory(dir);

Bear in mind this will also delete the containing directory.

Add this line in gradle file to have Apache

compile 'org.apache.commons:commons-io:1.3.2'  

Solution 2

Check this link also Delete folder from internal storage in android?.

void deleteRecursive(File fileOrDirectory) {

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

    fileOrDirectory.delete();

}

Solution 3

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

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

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.

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();
}

Solution 4

if storageDir is a directory

for(File tempFile : storageDir.listFiles()) {
    tempFile.delete();
}

Solution 5

For your case, this works perfectly http://commons.apache.org/proper/commons-io/apidocs/org/apache/commons/io/FileUtils.html#cleanDirectory(java.io.File)

File dir = new File("dir_path");
if(dir.exists() && dir.isDirectory()) {
    FileUtils.cleanDirectory(dir);
}

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

http://commons.apache.org/proper/commons-io/apidocs/org/apache/commons/io/FileUtils.html#forceDelete(java.io.File)

File dir = new File("dir_path");
if(dir.exists()) {
    FileUtils.forceDelete(dir);
}

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