如何找到空sub_folder并使用android删除空sub_folder？

Question

我是否正在使用 android 使用文件概念创建示例应用程序，

以下步骤是：

--- 1.我给父文件夹取名"default"

--- 2. 找到父文件夹到子文件夹。

--- 3.列出子文件夹文件。

--- 4.删除清空子文件夹

我会完成三个步骤，问题是如何找到子文件夹是空的给我一个解决方案？

示例代码：

  File filefirst = new File("/storage/sdcard0/Parentfoldername/");
            String[] names = filefirst.list();

            for (String name : names) 
            {
                if (new File("/storage/sdcard0/Parentfoldername/" + name).isDirectory()) {

                    File directory = new File("/storage/sdcard0/Parentfoldername/" + name);
                    //get all the files from a directory
                    File[] fList = directory.listFiles();
                    for (File file : fList) {

                        if (file.isFile()) 
                        {
                       if (directory.isDirectory()) 
                          {
                              String[] children = directory.list();
                            for (int i = 0; i < children.length; i++)
                             {

                                  new File(directory, children[i]).delete();

                             }

                          }


                        }
                    }
                }
            }

此代码类似于删除文件中的 sub_folder，删除 sub_folder 不是文件夹是文件，但 Empty sub_folder 不是删除。

Answer 1

public class Utils {
  /**
   * Empty and delete a folder (and subfolders).
   * @param folder
   *            folder to empty
   */
  public static void rmdir(final File folder) {
      // check if folder file is a real folder
      if (folder.isDirectory()) {
          File[] list = folder.listFiles();
          if (list != null) {
              for (int i = 0; i < list.length; i++) {
                  File tmpF = list[i];
                  if (tmpF.isDirectory()) {
                      rmdir(tmpF);
                  }
                  tmpF.delete();
              }
          }
          if (!folder.delete()) {
            System.out.println("can't delete folder : " + folder);
          }
      }
  }
}