Android file operation tool class details
- 2021-12-04 19:54:28
- OfStack
This article example for everyone to share the Android file operation tool class specific code, for your reference, the specific content is as follows
Paste a file operation tool class written by me, which basically covers all kinds of file operations:
1. New and deleted files;
2. Copy of files;
3. Obtain the file extension;
4. Rename the file;
5. Get the details of a file;
6. Calculate the size of a file;
7. Format the file size;
8. Get the file list under a certain path;
9. Get a list of files in a certain directory;
10. New and deleted directories;
11. Replication of directories;
12. Calculate the number of files contained in a directory;
13. Calculate the file size contained in a directory;
The code is as follows:
1. FileUtil. java
package com.ctgu.filemaster.utils;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import android.os.Environment;
import android.util.Log;
public class FileUtil
{
private static final String[][] MIME_MapTable =
{
// {后缀名， MIME类型}
{ ".3gp", "video/3gpp" }, { ".apk", "application/vnd.android.package-archive" },
{ ".asf", "video/x-ms-asf" }, { ".avi", "video/x-msvideo" },
{ ".bin", "application/octet-stream" }, { ".bmp", "image/bmp" }, { ".c", "text/plain" },
{ ".class", "application/octet-stream" }, { ".conf", "text/plain" }, { ".cpp", "text/plain" },
{ ".doc", "application/msword" },
{ ".docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document" },
{ ".xls", "application/vnd.ms-excel" },
{ ".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" },
{ ".exe", "application/octet-stream" }, { ".gif", "image/gif" },
{ ".gtar", "application/x-gtar" }, { ".gz", "application/x-gzip" }, { ".h", "text/plain" },
{ ".htm", "text/html" }, { ".html", "text/html" }, { ".jar", "application/java-archive" },
{ ".java", "text/plain" }, { ".jpeg", "image/jpeg" }, { ".jpg", "image/jpeg" },
{ ".js", "application/x-javascript" }, { ".log", "text/plain" }, { ".m3u", "audio/x-mpegurl" },
{ ".m4a", "audio/mp4a-latm" }, { ".m4b", "audio/mp4a-latm" }, { ".m4p", "audio/mp4a-latm" },
{ ".m4u", "video/vnd.mpegurl" }, { ".m4v", "video/x-m4v" }, { ".mov", "video/quicktime" },
{ ".mp2", "audio/x-mpeg" }, { ".mp3", "audio/x-mpeg" }, { ".mp4", "video/mp4" },
{ ".mpc", "application/vnd.mpohun.certificate" }, { ".mpe", "video/mpeg" },
{ ".mpeg", "video/mpeg" }, { ".mpg", "video/mpeg" }, { ".mpg4", "video/mp4" },
{ ".mpga", "audio/mpeg" }, { ".msg", "application/vnd.ms-outlook" }, { ".ogg", "audio/ogg" },
{ ".pdf", "application/pdf" }, { ".png", "image/png" },
{ ".pps", "application/vnd.ms-powerpoint" }, { ".ppt", "application/vnd.ms-powerpoint" },
{ ".pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation" },
{ ".prop", "text/plain" }, { ".rc", "text/plain" }, { ".rmvb", "audio/x-pn-realaudio" },
{ ".rtf", "application/rtf" }, { ".sh", "text/plain" }, { ".tar", "application/x-tar" },
{ ".tgz", "application/x-compressed" }, { ".txt", "text/plain" }, { ".wav", "audio/x-wav" },
{ ".wma", "audio/x-ms-wma" }, { ".wmv", "audio/x-ms-wmv" },
{ ".wps", "application/vnd.ms-works" }, { ".xml", "text/plain" },
{ ".z", "application/x-compress" }, { ".zip", "application/x-zip-compressed" }, { "", "*/*" }
};
/**
* 根据文件后缀名获得对应的MIME类型
*
* @param file
* 文件对象
*/
public static String getMIMEType(File file)
{
String type = "*/*";
String fileName = file.getName();
int dotIndex = fileName.lastIndexOf("."); // 获取后缀名前的分隔符"."在fileName中的位置
if (dotIndex < 0)
{
return type;
}
String end = fileName.substring(dotIndex, fileName.length()).toLowerCase(Locale.getDefault()); // 获取文件的后缀名
if (end.length() == 0)
{
return type;
}
// 在MIME和文件类型的匹配表中找到对应的MIME类型
for (int i = 0; i < MIME_MapTable.length; i++)
{
if (end.equals(MIME_MapTable[i][0]))
{
type = MIME_MapTable[i][1];
}
}
return type;
}
/**
* 创建文件
*
* @param path
* 文件所在目录的目录名，如/java/test/0.txt,要在当前目录下创建1个文件名为1.txt的文件，<br>
* 则path为/java/test，fileName为1.txt
* @param fileName
* 文件名
* @return 文件新建成功则返回true
*/
public static boolean createFile(String path, String fileName)
{
File file = new File(path + File.separator + fileName);
if (file.exists())
{
Log.w(Util.TAG, "新建文件失败：file.exist()=" + file.exists());
return false;
}
else
{
try
{
boolean isCreated = file.createNewFile();
return isCreated;
}
catch (IOException e)
{
e.printStackTrace();
}
}
return false;
}
/**
* 删除单个文件
*
* @param file
* 要删除的文件对象
* @return 文件删除成功则返回true
*/
public static boolean deleteFile(File file)
{
if (file.exists())
{
boolean isDeleted = file.delete();
Log.w(Util.TAG, file.getName() + "删除结果：" + isDeleted);
return isDeleted;
}
else
{
Log.w(Util.TAG, "文件删除失败：文件不存在！");
return false;
}
}
/**
* 删除单个文件
*
* @param path
* 文件所在路径名
* @param fileName
* 文件名
* @return 删除成功则返回true
*/
public static boolean deleteFile(String path, String fileName)
{
File file = new File(path + File.separator + fileName);
if (file.exists())
{
boolean isDeleted = file.delete();
return isDeleted;
}
else
{
return false;
}
}
/**
* 复制文件
*
* @param srcPath
* 源文件绝对路径
* @param destDir
* 目标文件所在目录
* @return boolean
*/
public static boolean copyFile(String srcPath, String destDir)
{
boolean flag = false;
File srcFile = new File(srcPath); // 源文件
if (!srcFile.exists())
{
// 源文件不存在
Util.toast("源文件不存在");
return false;
}
// 获取待复制文件的文件名
String fileName = srcPath.substring(srcPath.lastIndexOf(File.separator));
String destPath = destDir + fileName;
if (destPath.equals(srcPath))
{
// 源文件路径和目标文件路径重复
Util.toast("源文件路径和目标文件路径重复!");
return false;
}
File destFile = new File(destPath); // 目标文件
if (destFile.exists() && destFile.isFile())
{
// 该路径下已经有1个同名文件
Util.toast("目标目录下已有同名文件!");
return false;
}
File destFileDir = new File(destDir);
destFileDir.mkdirs();
try
{
FileInputStream fis = new FileInputStream(srcPath);
FileOutputStream fos = new FileOutputStream(destFile);
byte[] buf = new byte[1024];
int c;
while ((c = fis.read(buf)) != -1)
{
fos.write(buf, 0, c);
}
fis.close();
fos.close();
flag = true;
}
catch (IOException e)
{
e.printStackTrace();
}
if (flag)
{
Util.toast("复制文件成功!");
}
return flag;
}
/**
* 根据文件名获得文件的扩展名
*
* @param fileName
* 文件名
* @return 文件扩展名（不带点）
*/
public static String getFileSuffix(String fileName)
{
int index = fileName.lastIndexOf(".");
String suffix = fileName.substring(index + 1, fileName.length());
return suffix;
}
/**
* 重命名文件
*
* @param oldPath
* 旧文件的绝对路径
* @param newPath
* 新文件的绝对路径
* @return 文件重命名成功则返回true
*/
public static boolean renameTo(String oldPath, String newPath)
{
if (oldPath.equals(newPath))
{
Log.w(Util.TAG, "文件重命名失败：新旧文件名绝对路径相同！");
return false;
}
File oldFile = new File(oldPath);
File newFile = new File(newPath);
boolean isSuccess = oldFile.renameTo(newFile);
Log.w(Util.TAG, "文件重命名是否成功：" + isSuccess);
return isSuccess;
}
/**
* 重命名文件
*
* @param oldFile
* 旧文件对象
* @param newFile
* 新文件对象
* @return 文件重命名成功则返回true
*/
public static boolean renameTo(File oldFile, File newFile)
{
if (oldFile.equals(newFile))
{
Log.w(Util.TAG, "文件重命名失败：旧文件对象和新文件对象相同！");
return false;
}
boolean isSuccess = oldFile.renameTo(newFile);
Log.w(Util.TAG, "文件重命名是否成功：" + isSuccess);
return isSuccess;
}
/**
* 重命名文件
*
* @param oldFile
* 旧文件对象，File类型
* @param newName
* 新文件的文件名，String类型
* @return 重命名成功则返回true
*/
public static boolean renameTo(File oldFile, String newName)
{
File newFile = new File(oldFile.getParentFile() + File.separator + newName);
boolean flag = oldFile.renameTo(newFile);
System.out.println(flag);
return flag;
}
/**
* 计算某个文件的大小
*
* @param file
* 文件对象
* @return 文件大小，如果file不是文件，则返回-1
*/
public static long getFileSize(File file)
{
if (file.isFile())
{
return file.length();
}
else
{
return -1;
}
}
/**
* 计算某个文件的大小
*
* @param path
* 文件的绝对路径
* @return
*/
public static long getFileSize(String path)
{
File file = new File(path);
long size = file.length();
return size;
}
/**
* 文件大小的格式化
*
* @param size
* 文件大小，单位为byte
* @return 文件大小格式化后的文本
*/
public static String formatSize(long size)
{
DecimalFormat df = new DecimalFormat("####.00");
if (size < 1024) // 小于1KB
{
return size + "Byte";
}
else if (size < 1024 * 1024) // 小于1MB
{
float kSize = size / 1024f;
return df.format(kSize) + "KB";
}
else if (size < 1024 * 1024 * 1024) // 小于1GB
{
float mSize = size / 1024f / 1024f;
return df.format(mSize) + "MB";
}
else if (size < 1024L * 1024L * 1024L * 1024L) // 小于1TB
{
float gSize = size / 1024f / 1024f / 1024f;
return df.format(gSize) + "GB";
}
else
{
return "size: error";
}
}
/**
* 格式化文件最后修改时间字符串
*
* @param time
* @return
*/
public static String formatTime(long time)
{
Date date = new Date(time);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd,HH:mm:ss", Locale.getDefault());
String formatedTime = sdf.format(date);
return formatedTime;
}
/**
* 获取某个路径下的文件列表
*
* @param path
* 文件路径
* @return 文件列表File[] files
*/
public static File[] getFileList(String path)
{
File file = new File(path);
if (file.isDirectory())
{
File[] files = file.listFiles();
if (files != null)
{
return files;
}
else
{
return null;
}
}
else
{
return null;
}
}
/**
* 获取某个目录下的文件列表
*
* @param directory
* 目录
* @return 文件列表File[] files
*/
public static File[] getFileList(File directory)
{
File[] files = directory.listFiles();
if (files != null)
{
return files;
}
else
{
return null;
}
}
/**
* 获得根目录文件列表
*
* @param showHidden
* @param object
* @param showHidden
* 是否显示隐藏文件
* @return
*/
public static List<File> getSDCardFileList(boolean showHidden)
{
List<File> list = new ArrayList<>();
File files[];
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))
{
File extDir = Environment.getExternalStorageDirectory();
files = extDir.listFiles();
for (File file : files)
{
list.add(file);
}
if (showHidden)
{
//
}
else
{
for (int i = 0; i < list.size(); i++)
{
File file = list.get(i);
if (file.isHidden() || file.getName().startsWith("."))
{
list.remove(file);
}
}
}
}
else
{
Util.toast("SD卡未挂载！");
}
return list;
}
/**
* 新建目录
*
* @param path
* 目录的绝对路径
* @return 创建成功则返回true
*/
public static boolean createFolder(String path)
{
File file = new File(path);
boolean isCreated = file.mkdir();
return isCreated;
}
/**
* 新建目录
*
* @param file
* @return
*/
public static boolean createFolder(File file)
{
boolean isCreated = file.mkdir();
return isCreated;
}
/**
* 删除文件夹及其包含的所有文件
*
* @param file
* @return
*/
public static boolean deleteFolder(File file)
{
boolean flag = false;
File files[] = file.listFiles();
if (files != null && files.length >= 0) // 目录下存在文件列表
{
for (int i = 0; i < files.length; i++)
{
File f = files[i];
if (f.isFile())
{
// 删除子文件
flag = deleteFile(f);
if (flag == false)
{
return flag;
}
}
else
{
// 删除子目录
flag = deleteFolder(f);
if (flag == false)
{
return flag;
}
}
}
}
flag = file.delete();
if (flag == false)
{
return flag;
}
else
{
return true;
}
}
/**
* 复制目录
*
* @param srcPath
* 源文件夹路径
* @param destPath
* 目标文件夹所在目录
* @return 复制成功则返回true
*/
public static boolean copyFolder(String srcPath, String destDir)
{
Util.toast("复制文件夹开始!");
boolean flag = false;
File srcFile = new File(srcPath);
if (!srcFile.exists())
{
// 源文件夹不存在
Util.toast("源文件夹不存在");
return false;
}
String dirName = getDirName(srcPath); // 获得待复制的文件夹的名字，比如待复制的文件夹为"E://dir"则获取的名字为"dir"
String destPath = destDir + File.separator + dirName; // 目标文件夹的完整路径
// Util.toast("目标文件夹的完整路径为：" + destPath);
if (destPath.equals(srcPath))
{
Util.toast("目标文件夹与源文件夹重复");
return false;
}
File destDirFile = new File(destPath);
if (destDirFile.exists())
{
// 目标位置有1个同名文件夹
Util.toast("目标位置已有同名文件夹!");
return false;
}
destDirFile.mkdirs(); // 生成目录
File[] files = srcFile.listFiles(); // 获取源文件夹下的子文件和子文件夹
if (files.length == 0)
{
// 如果源文件夹为空目录则直接设置flag为true，这1步非常隐蔽，debug了很久
flag = true;
}
else
{
for (File temp : files)
{
if (temp.isFile())
{
// 文件
flag = copyFile(temp.getAbsolutePath(), destPath);
}
else if (temp.isDirectory())
{
// 文件夹
flag = copyFolder(temp.getAbsolutePath(), destPath);
}
if (!flag)
{
break;
}
}
}
if (flag)
{
Util.toast("复制文件夹成功!");
}
return flag;
}
/**
* 获取待复制文件夹的文件夹名
*
* @param dir
* @return String
*/
public static String getDirName(String dir)
{
if (dir.endsWith(File.separator))
{
// 如果文件夹路径以"//"结尾，则先去除末尾的"//"
dir = dir.substring(0, dir.lastIndexOf(File.separator));
}
return dir.substring(dir.lastIndexOf(File.separator) + 1);
}
/**
* 计算某个目录包含的文件数量
*
* @param directory
* @return
*/
public static int getFileCount(File directory)
{
File[] files = directory.listFiles();
int count = files.length;
return count;
}
/**
* 计算某个路径下所包含的文件数量
*
* @param path
* @return
*/
public static int getFileCount(String path)
{
File file = new File(path);
File[] files = file.listFiles();
int count = files.length;
return count;
}
/**
* 计算某个目录的大小
*
* @param file
* @return
*/
public static long getFolderSize(File directory)
{
File[] files = directory.listFiles();
if (files != null && files.length >= 0)
{
long size = 0;
for (File f : files)
{
if (f.isFile())
{
// 获得子文件的大小
size = size + getFileSize(f);
}
else
{
// 获得子目录的大小
size = size + getFolderSize(f);
}
}
return size;
}
return -1;
}
/**
* 获得某个文件或目录的大小
*
* @param file
* @return
*/
public static long getFileOrFolderSize(File file)
{
long size = 0;
if (file.isDirectory())
{
size = getFolderSize(file);
}
else
{
size = getFileSize(file);
}
return size;
}
}All the above methods have been tested under Windows platform system, basically no problem. If you encounter any problems, you can leave me a message in the comments, welcome to correct!