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

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();}

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'  

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();}