Android基于名称、修改时间、大小实现文件夹排序

/**
 * 按文件名排序
 * @param filePath
 */
 public static ArrayList orderByName(String filePath) {
 ArrayList FileNameList = new ArrayList();
 File file = new File(filePath);
 File[] files = file.listFiles();
 List fileList = Arrays.asList(files);
 Collections.sort(fileList, new Comparator() {
  @Override
  public int compare(File o1, File o2) {
  if (o1.isDirectory() && o2.isFile())
   return -1;
  if (o1.isFile() && o2.isDirectory())
   return 1;
  return o1.getName().compareTo(o2.getName());
  }
 });
 for (File file1 : files) {
  if (file1.isDirectory()) {
  FileNameList.add(file1.getName());
  }
 }
 return FileNameList;
 }

/**
 * 按文件修改时间排序
 * @param filePath
 */
 public static ArrayList orderByDate(String filePath) {
 ArrayList FileNameList = new ArrayList();
 File file = new File(filePath);
 File[] files = file.listFiles();
 Arrays.sort(files, new Comparator() {
  public int compare(File f1, File f2) {
  long diff = f1.lastModified() - f2.lastModified();
  if (diff > 0)
   return 1;
  else if (diff == 0)
   return 0;
  else
   return -1;// 如果 if 中修改为 返回-1 同时此处修改为返回 1 排序就会是递减
  }
 
  public boolean equals(Object obj) {
  return true;
  }
 
 });
 
 for (File file1 : files) {
  if (file1.isDirectory()) {
  FileNameList.add(file1.getName());
  }
 }
 return FileNameList;
 }

/**
 * 按文件大小排序
 * @param filePath
 */
 public static ArrayList orderBySize(String filePath) {
 ArrayList FileNameList = new ArrayList();
 File file = new File(filePath);
 File[] files = file.listFiles();
 List fileList = Arrays.asList(files);
 Collections.sort(fileList, new Comparator() {
  public int compare(File f1, File f2) {
  long s1 = getFolderSize(f1);
  long s2 = getFolderSize(f2);
 
  long diff = s1 - s2;
  if (diff > 0)
   return 1;
  else if (diff == 0)
   return 0;
  else
   return -1;// 如果 if 中修改为 返回-1 同时此处修改为返回 1 排序就会是递减
  }
 
  public boolean equals(Object obj) {
  return true;
  }
 });
 
 for (File file1 : files) {
  if (file1.isDirectory()) {
  FileNameList.add(file1.getName());
  }
 }
 return FileNameList;
 }
 
 /**
 * 获取文件夹大小
 * @param file File实例
 * @return long
 */
 public static long getFolderSize(File file) {
 
 long size = 0;
 try {
  java.io.File[] fileList = file.listFiles();
  for (int i = 0; i