Androidファイルおよびフォルダの作成、削除、名前変更、コピーのコピーについて

package com.example.administrator.myapplication.util;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by Administrator on 2019/5/17 0017.
 */

public class FileUtils {

    private static final String TAG = "FileUtils";

    /**
     *     
     *
     * @param filePath     
     * @param fileName    
     * @return
     */
    public static boolean createFile(String filePath, String fileName) {

        String strFilePath = filePath + fileName;

        File file = new File(filePath);
        if (!file.exists()) {
            /**        mkdirs()              */
            file.mkdirs();
        }

        File subfile = new File(strFilePath);

        if (!subfile.exists()) {
            try {
                boolean b = subfile.createNewFile();
                return b;
            } catch (IOException e) {
                e.printStackTrace();
            }
        } else {
            return true;
        }
        return false;
    }

    /**
     *          
     *
     * @param file   
     */
    public static List getFile(File file) {
        List list = new ArrayList<>();
        File[] fileArray = file.listFiles();
        if (fileArray == null) {
            return null;
        } else {
            for (File f : fileArray) {
                if (f.isFile()) {
                    list.add(0, f);
                } else {
                    getFile(f);
                }
            }
        }
        return list;
    }

    /**
     *     
     *
     * @param filePath     
     * @return
     */
    public static boolean deleteFiles(String filePath) {
        List files = getFile(new File(filePath));
        if (files.size() != 0) {
            for (int i = 0; i < files.size(); i++) {
                File file = files.get(i);

                /**                        */
                if (file.isFile()) {
                    file.delete();
                }

            }
        }
        return true;
    }


    /**
     *         
     *
     * @param strcontent   
     * @param filePath     
     * @param fileName      
     */
    public static void writeToFile(String strcontent, String filePath, String fileName) {
        //       ，     ，     
        String strFilePath = filePath + fileName;
        //      ，    

        File subfile = new File(strFilePath);


        RandomAccessFile raf = null;
        try {
            /**                    */
            raf = new RandomAccessFile(subfile, "rw");
            /**                  */
            raf.seek(subfile.length());
            /**            */
            raf.write(strcontent.getBytes());

            raf.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    /**
     *       （      ）
     *
     * @param path        
     * @param content     
     * @param append          ，         (true=  )(false=  )
     */
    public static void modifyFile(String path, String content, boolean append) {
        try {
            FileWriter fileWriter = new FileWriter(path, append);
            BufferedWriter writer = new BufferedWriter(fileWriter);
            writer.append(content);
            writer.flush();
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     *       
     *
     * @param filePath   
     * @param filename   
     * @return     
     */
    public static String getString(String filePath, String filename) {
        FileInputStream inputStream = null;
        try {
            inputStream = new FileInputStream(new File(filePath + filename));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        InputStreamReader inputStreamReader = null;
        try {
            inputStreamReader = new InputStreamReader(inputStream, "UTF-8");
        } catch (UnsupportedEncodingException e1) {
            e1.printStackTrace();
        }
        BufferedReader reader = new BufferedReader(inputStreamReader);
        StringBuffer sb = new StringBuffer("");
        String line;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line);
                sb.append("
");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return sb.toString();
    }

    /**
     *      
     *
     * @param oldPath        
     * @param newPath       
     */
    public static void renameFile(String oldPath, String newPath) {
        File oleFile = new File(oldPath);
        File newFile = new File(newPath);
        //     
        oleFile.renameTo(newFile);
    }


    /**
     *     
     *
     * @param fromFile         
     * @param toFile           
     * @return       
     */
    public static boolean copy(String fromFile, String toFile) {
        //        
        File[] currentFiles;
        File root = new File(fromFile);
        //    SD             
        //       return  
        if (!root.exists()) {
            return false;
        }
        //                      
        currentFiles = root.listFiles();

        //    
        File targetDir = new File(toFile);
        //    
        if (!targetDir.exists()) {
            targetDir.mkdirs();
        }
        //              
        for (int i = 0; i < currentFiles.length; i++) {
            if (currentFiles[i].isDirectory())//              
            {
                copy(currentFiles[i].getPath() + "/", toFile + currentFiles[i].getName() + "/");

            } else//               
            {
                CopySdcardFile(currentFiles[i].getPath(), toFile + currentFiles[i].getName());
            }
        }
        return true;
    }


    //    
    //              (   )    
    public static boolean CopySdcardFile(String fromFile, String toFile) {

        try {
            InputStream fosfrom = new FileInputStream(fromFile);
            OutputStream fosto = new FileOutputStream(toFile);
            byte bt[] = new byte[1024];
            int c;
            while ((c = fosfrom.read(bt)) > 0) {
                fosto.write(bt, 0, c);
            }
            fosfrom.close();
            fosto.close();
            return true;

        } catch (Exception ex) {
            return false;
        }
    }

}