Android 实现文件夹排序功能的实例代码

转自：https://www.jb51.net/article/147787.htm
Android 实现文件夹排序功能的实例代码
按文件名排序
/**

• 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;
  }
  基于名称：
  /*
• 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;
  }
  基于最近修改时间：
  /*
• 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;
  }
  基于大小：
  /*
• 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 < fileList.length; i++) {
  if (fileList[i].isDirectory()) {
  size = size + getFolderSize(fileList[i]);
  } else {
  size = size + fileList[i].length();
  }
  }
  } catch (Exception e) {
  e.printStackTrace();
  }
  return size;
  }