Android implements folder sorting based on name modification time and size

This article example for everyone to share the Android implementation of folder sorting specific code, for your reference, the specific content is as follows

Based on name:

/**
 *  Sort by file name 
 * @param filePath
 */
 public static ArrayList<String> orderByName(String filePath) {
 ArrayList<String> FileNameList = new ArrayList<String>();
 File file = new File(filePath);
 File[] files = file.listFiles();
 List fileList = Arrays.asList(files);
 Collections.sort(fileList, new Comparator<File>() {
  @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;
 }

Based on the last modification time:

/**
 *  Sort by file modification time 
 * @param filePath
 */
 public static ArrayList<String> orderByDate(String filePath) {
 ArrayList<String> FileNameList = new ArrayList<String>();
 File file = new File(filePath);
 File[] files = file.listFiles();
 Arrays.sort(files, new Comparator<File>() {
  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;//  If  if  Modify in to   Return -1  At the same time, it is modified here to return  1  The sort will be decreasing 
  }
 
  public boolean equals(Object obj) {
  return true;
  }
 
 });
 
 for (File file1 : files) {
  if (file1.isDirectory()) {
  FileNameList.add(file1.getName());
  }
 }
 return FileNameList;
 }

Based on size:

/**
 *  Sort by file size 
 * @param filePath
 */
 public static ArrayList<String> orderBySize(String filePath) {
 ArrayList<String> FileNameList = new ArrayList<String>();
 File file = new File(filePath);
 File[] files = file.listFiles();
 List<File> fileList = Arrays.asList(files);
 Collections.sort(fileList, new Comparator<File>() {
  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;//  If  if  Modify in to   Return -1  At the same time, it is modified here to return  1  The sort will be decreasing 
  }
 
  public boolean equals(Object obj) {
  return true;
  }
 });
 
 for (File file1 : files) {
  if (file1.isDirectory()) {
  FileNameList.add(file1.getName());
  }
 }
 return FileNameList;
 }
 
 /**
 *  Get folder size 
 * @param file File Instances 
 * @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;
}