Android编程实现对文件夹里文件排序的方法

private int mFileSize = 0;private List<String> mPathString = new ArrayList<String>();private boolean sortFolder(String path) {    if (path == null || StringUtil.isEmpty(path))      return false;    File[] fileList = null;    File file = new File(path);    if (file.exists() == false){      file.mkdir();    }    if (!file.exists() || (file.isDirectory() && (file.listFiles().length == 0))) {      return true;    } else {      fileList = file.listFiles();      mFileSize = file.listFiles().length;  mPathString.clear();      if(mFileSize > 0) {        for(int i = 0;i < mFileSize;i++) {          mPathString.add(fileList[i].getAbsolutePath());        }        Collections.sort(mPathString);      }      return false;    }}