Java-written File Manager code sharing _java

More suitable for beginners. There is still a problem in logic. Can be used to learn Java file operations

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The following are the main Java file manipulation codes

Filehelp.java

Package self.yy.filesystem.fileutil;
Import Android.content.Context;
Import Android.util.Log;
 
Import Android.widget.Toast;
Import Java.io.File;
Import Java.io.FileInputStream;
Import java.io.FileNotFoundException;
Import Java.io.FileOutputStream;
Import java.io.IOException;
Import Java.net.URI;
Import Java.nio.channels.FileChannel;
Import Java.text.SimpleDateFormat;
Import java.util.ArrayList;
Import Java.util.Calendar;
 
Import java.util.List;
 
  /** * File Related Help class * * * public class Filehelp {private static final String TAG = "Filehelp";
  public static final String JPG = ". JPG";
 
  public static final String PNG = ". png";
  public static final String MP3 = ". mp3";
  public static final String MP4 = ". mp4";
 
  public static final String APK = ". APK";
 
  Contextual private static context;
 
  /** * TXT text */public static int istxt = 0;
 
  private static String txt = ". txt"; /** * File deletion */public static Boolean deletfile (file file) {if file.isdirectory()) {if (File.listfiles (). length > 0) {for (file I:file.listfiles ()) {deletfile (i);
      } else {file.delete ();
    } else {file.delete ();
    } file.delete ();
  return true;
  /** * New Folder * Return True file creation Success * return false file creation failed-> file exists * Return True file creation succeeded, return false file creation failed (file exists, insufficient permissions) * * public static Boolean Creatfile (string filename, string path) {File File = new file (path + file.separator + Filenam
    e);
    if (file.exists ()) {return false;
      else {file.mkdir ();
    return true; /** * Create custom file type Files * Free for folder * 0 txt text * * @return Boolean * Returns true file creation succeeded, returns false file creation failed (file exists, Insufficient permissions) * */public static Boolean creatfile (string filename, string path, int type) {string ptr = path + Fil
    E.separator + filename;
    File file;
        Switch (type) {case 0:file = new file (ptr + TXT);
      Break Default:file = new File (PTR);
    Break
    } if (File.exists ()) {return false;
        else {try {file.createnewfile ();
      return true;
      catch (IOException e) {return false; /** * File Duplicate name * * @param name the newly created filename * @param the place where file was created * * public static Boolean Renam
    E (string name, file file) {string pathstr = File.getparent () + file.separator + name;
  Return File.renameto (new file (PATHSTR)); /** * File Copy * * @param oldfile the file to be copied * @param tonewpath copied to * @return Boolean trun replication succeeded, false copy Failed * */public static Boolean Copeyfile (File oldfile, String tonewpath) {string newfilepath = Tonewpath + F
 
    Ile.separator + oldfile.getname ();
    File temp = new file (Newfilepath);
    Determines whether a relative file exists for the file path being copied to, and if so, stops the operation if (Temp.exists ()) {return false;
      //Determine whether the copied file type is a folder if (Oldfile.isdirectory ()) {Temp.mkdir ();
 For (File i:oldfile.listfiles ()) {       Copeyfile (i, Temp.getpath ()); }} else {//If it is a file, make a pipe copy try {//Create a pipeline from the file stream FileInputStream fis = new FileInputStream (old
        File);
        FileChannel Creatchannel = Fis.getchannel ();
        Create pipeline in file output target FileOutputStream fos = new FileOutputStream (Newfilepath);
        FileChannel Getchannel = Fos.getchannel ();
 
        Make file copy (pipe butt) getchannel.transferfrom (creatchannel, 0, Creatchannel.size ());
        Getchannel.close ();
        Creatchannel.close ();
        Fos.flush ();
        Fos.close ();
      Fis.close ();
        catch (Exception e) {log.i (TAG, "Copey Defeated,mebey file was existed");
        E.printstacktrace ();
      return false;
  } return true;  /** * File Cut * * @param oldfile The file to be clipped * @param where newfilepath is clipped * @return Boolean trun cut succeeded, false Cut failure/public static Boolean Cutfile (File oldfile, String newfilepath) {if (Copeyfile (Oldfile, Newfilepath)) {
      Oldfile.delete ();
    return true;
    else {return false; }/** * Get the file type of the Ask set * * @param dir folder * @param type file types, format ". xxx" * @return list<file> file Set */public static list<file> Getthetypefile (File dir, String type) {list<file> files = new Arrayli
    St<file> ();
      For (File i:dir.listfiles ()) {String Filestyepe = Getfiletype (i);
      if (Type.equals (Filestyepe)) {files.add (i);
  } return to files; 
   /** * Get File type * * @param file required to validate * @return String file type * such as: * Incoming file with filename "test.txt" * returns. txt
    * * */public static String getfiletype (file file) {string fileName = File.getname (); if (Filename.contains ("."))
      {String FileType = filename.substring (Filename.lastindexof ("."), Filename.length ());
    return fileType;
    else {return null; /** * Get file Last operation time class * * @param file class to query @return "Yy/mm/dd HH:mm:ss" data string * such as: * 14/07/01 01:02:03/public static string getcreattime (file file) {
    Long time = file.lastmodified ();
    Calendar calendar = Calendar.getinstance ();
    SimpleDateFormat DateFormat = new SimpleDateFormat ("Yy/mm/dd HH:mm:ss");
    String date = Dateformat.format (Calendar.gettime ());
  return date; }
 
}

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