你想要的这都有-Android文件工具类FileUtils

包含所有关于文件处理的工具类

/**
* 对文件处理的工具类
*/
public class FileUtils {
/**
* 获取可以使用的缓存目录(默认目录名/itlanbaoApp/)
* @param context
* @return
*/
public static File getDiskCacheDir(Context context) {
return getDiskCacheDir(context, FileConstants.RESOURCE_DIRECTORY);
}

/**
 * 获取可以使用的缓存目录
 * @param context
 * @param uniqueName 目录名称
 * @return
 */
public static File getDiskCacheDir(Context context, String uniqueName) {
    final String cachePath = checkSDCard() ? getExternalCacheDir(context).getPath() : getAppCacheDir(context);

    File cacheDirFile = new File(cachePath);
    if (!cacheDirFile.exists()) {
        cacheDirFile.mkdirs();
    }

    return cacheDirFile;
}

/**
 * 获取程序外部的缓存目录
 * @param context
 * @return
 */
 public static File getExternalCacheDir(Context context) {
     // 这个sd卡中文件路径下的内容会随着，程序卸载或者设置中清除缓存后一起清空
     final String cacheDir = "/Android/data/" + context.getPackageName() + "/cache/";
     return new File(Environment.getExternalStorageDirectory().getPath() + cacheDir);
 }

 /**
  * 获取文件路径空间大小
  * @param path
  * @return
  */
 public static long getUsableSpace(File path) {
     try{
          final StatFs stats = new StatFs(path.getPath());
          return (long) stats.getBlockSize() * (long) stats.getAvailableBlocks();
     }catch (Exception e) {
         e.printStackTrace();
         return -1;
     }

 }

 /**
  * 空间大小单位格式化
  * @param size
  * @return
  */
 public static String formatSize(long size) {

// Formatter.formatFileSize()
String suffix = null;
float fSize=0;

     if (size >= 1024) {
         suffix = "KB";
         fSize=size / 1024;
         if (fSize >= 1024) {
             suffix = "MB";
             fSize /= 1024;
         }
         if (fSize >= 1024) {
             suffix = "GB";
             fSize /= 1024;
         }
     } else {
         fSize = size;
     }

     java.text.DecimalFormat df = new java.text.DecimalFormat("#0.00");
     StringBuilder resultBuffer = new StringBuilder(df.format(fSize));
     if (suffix != null)
         resultBuffer.append(suffix);
     return resultBuffer.toString();
 }

/**
 * 检查SD卡是否存在
 *
 * @return
 */
public static boolean checkSDCard() {
    final String status = Environment.getExternalStorageState();
    if (Environment.MEDIA_MOUNTED.equals(status)) {
        return true;
    }
    return false;
}

/**
 * 获取安装在用户手机上的com.itlanbao.app下的files目录
 *
 * @return files path
 */
public static String getAppFilesDir(Context context) {
    return context.getFilesDir().getAbsolutePath();
}

/**
 * 获取安装在用户手机上的com.itlanbao.yyapp下的cache目录
 *
 * @return cache path
 */
public static String getAppCacheDir(Context context) {
    return context.getCacheDir().getPath();
}

/**
 * 创建app主目录
 *
 * @return boolean
 */
public static boolean checkFileDirectory(Context context) {
    final File resDir = FileUtils.getDiskCacheDir(context);
    if (!resDir.exists()) {
        return resDir.mkdirs();
    }
    return true;
}

/**
 * 创建缓存文件夹
 */
public static void initCacheFile(Context context) {

    if (LogUtils.DEBUG) {
        LogUtils.v("initCacheFile");
    }

    final String cacheDir = FileUtils.getDiskCacheDir(context).getAbsolutePath();

    final String imageDirPath = cacheDir + FileConstants.CACHE_IMAGE_DIR;
    final File imageFileDir = new File(imageDirPath);
    if (!imageFileDir.exists()) {
        boolean isOk = imageFileDir.mkdirs();
        if (LogUtils.DEBUG) {
            LogUtils.v(imageDirPath + " 文件夹创建isOk" + isOk);
        }
    }

    final String audioDirPath = cacheDir + FileConstants.CACHE_AUDIO_DIR;
    final File audioFileDir = new File(audioDirPath);
    if (!audioFileDir.exists()) {
        boolean isOk = audioFileDir.mkdirs();
        if (LogUtils.DEBUG) {
            LogUtils.v(audioDirPath + " 文件夹创建isOk" + isOk);
        }
    }

    final String messageDirPath = cacheDir + FileConstants.CACHE_MESSAGE_DIR;
    final File messageFileDir = new File(messageDirPath);
    if (!messageFileDir.exists()) {
        boolean isOk = messageFileDir.mkdirs();
        if (LogUtils.DEBUG) {
            LogUtils.v(imageDirPath + " 文件夹创建isOk" + isOk);
        }
    }
}


/**
 * 读取文件
 *
 * @param sFileName
 * @return
 */
public static String readFile(String sFileName) {
    if (TextUtils.isEmpty(sFileName)) {
        return null;
    }

    final StringBuffer sDest = new StringBuffer();
    final File f = new File(sFileName);
    if (!f.exists()) {
        return null;
    }
    try {
        FileInputStream is = new FileInputStream(f);
        BufferedReader br = new BufferedReader(new InputStreamReader(is));

        try {
            String data = null;
            while ((data = br.readLine()) != null) {
                sDest.append(data);
            }
        } catch (IOException ioex) {
            if (LogUtils.DEBUG) {
                LogUtils.e(ioex);
            }
        } finally {
            is.close();
            is = null;
            br.close();
            br = null;
        }
    } catch (Exception ex) {
        if (LogUtils.DEBUG) {
            LogUtils.e(ex);
        }
    } catch (OutOfMemoryError ex) {
        if (LogUtils.DEBUG) {
            ex.printStackTrace();
        }
    }
    return sDest.toString().trim();
}

/**
 * 从assets 文件夹中获取文件并读取数据
 *
 * @param context
 * @param fileName
 * @param isEncoding
 * @return
 */
public static String getFromAssets(Context context, String fileName ) {
    String result = "";
    try {
        final InputStream in = context.getResources().getAssets()
                .open(fileName);
        // 获取文件的字节数
        final int lenght = in.available();
        // 创建byte数组
        byte[] buffer = new byte[lenght];
        // 将文件中的数据读到byte数组中
        in.read(buffer);

        result = EncodingUtils.getString(buffer, "UTF-8");
        in.close();
        buffer = null;
    } catch(FileNotFoundException e) {
        e.printStackTrace();
    } catch (Exception e) {
        if (LogUtils.DEBUG) {
            LogUtils.e(e);
        }
    }
    return result;
}

/**
 * 保存文件
 *
 * @param sToSave
 * @param sFileName
 * @param isAppend
 * @return
 */
public static boolean writeStringToFile(String content, String fileName, boolean isAppend) {
    return writeStringToFile(content, "", fileName, isAppend);
}

public static boolean writeStringToFile(String content,
        String directoryPath, String fileName, boolean isAppend) {
    if (!TextUtils.isEmpty(content)) {
        if (!TextUtils.isEmpty(directoryPath)) {// 是否需要创建新的目录
            final File threadListFile = new File(directoryPath);
            if (!threadListFile.exists()) {
                threadListFile.mkdirs();
            }
        }
        boolean bFlag = false;
        final int iLen = content.length();
        final File file = new File(fileName);
        try {
            if (!file.exists()) {
                file.createNewFile();
            }
            final FileOutputStream fos = new FileOutputStream(file,
                    isAppend);
            byte[] buffer = new byte[iLen];
            try {
                buffer = content.getBytes();
                fos.write(buffer);
                if (isAppend) {
                    fos.write("||".getBytes());
                }
                fos.flush();
                bFlag = true;
            } catch (IOException ioex) {
                if (LogUtils.DEBUG) {
                    LogUtils.e(ioex);
                }
            } finally {
                fos.close();
                buffer = null;
            }
        } catch (Exception ex) {
            if (LogUtils.DEBUG) {
                LogUtils.e(ex);
            }
        } catch (OutOfMemoryError o) {
            if (LogUtils.DEBUG) {
                o.printStackTrace();
            }
        }
        return bFlag;
    }
    return false;
}

/**
 * 重命名
 *
 * @param filePath
 * @return
 */
public static boolean rename(String filePath, String newFilePath) {
    if (LogUtils.DEBUG) {
        LogUtils.e("filePath " + filePath);
        LogUtils.e("newFilePath " + newFilePath);
    }

    if (!TextUtils.isEmpty(filePath)) {
        final File file = new File(filePath);
        final File newFile = new File(newFilePath);
        if (file.exists()) {
            return file.renameTo(newFile);
        }
    }
    return false;
}   

/**
 * 删除文件
 *
 * @param filePath
 * @return
 */
public static boolean deleteFile(String filePath) {
    if (LogUtils.DEBUG) {
        LogUtils.e("deleteFile path " + filePath);
    }

    if (!TextUtils.isEmpty(filePath)) {
        final File file = new File(filePath);
        if (LogUtils.DEBUG) {
            LogUtils.e("deleteFile path exists " + file.exists());
        }
        if (file.exists()) {
            return file.delete();
        }
    }
    return false;
}

/**
 * 删除文件夹下所有文件
 *
 * @return
 */
public static void deleteDirectoryAllFile(String directoryPath) {
    final File file = new File(directoryPath);
    deleteDirectoryAllFile(file);
}

public static void deleteDirectoryAllFile(File file) {
    if (!file.exists()) {
        return;
    }

    boolean rslt = true;// 保存中间结果
    if (!(rslt = file.delete())) {// 先尝试直接删除
        // 若文件夹非空。枚举、递归删除里面内容
        final File subs[] = file.listFiles();
        final int size = subs.length - 1;
        for (int i = 0; i <= size; i++) {
            if (subs[i].isDirectory())
                deleteDirectoryAllFile(subs[i]);// 递归删除子文件夹内容
            rslt = subs[i].delete();// 删除子文件夹本身
        }
        // rslt = file.delete();// 删除此文件夹本身
    }

    if (!rslt) {
        if (LogUtils.DEBUG) {
            LogUtils.w("无法删除:" + file.getName());
        }
        return;
    }
}

/**
 * 根据后缀名删除文件
 *
 * @param delpath
 *            path of file
 * @param delEndName
 *            end name of file
 * @return boolean the result
 */
public static boolean deleteEndFile(String delPath, String delEndName) {
    // param is null
    if (delPath == null || delEndName == null) {
        return false;
    }
    try {
        // create file
        final File file = new File(delPath);
        if (file != null) {
            if (file.isDirectory()) {
                // file list
                String[] fileList = file.list();
                File delFile = null;

                // digui
                final int size = fileList.length;
                for (int i = 0; i < size; i++) {
                    // create new file
                    delFile = new File(delPath + "/" + fileList[i]);
                    if (delFile != null && delFile.isFile()) {// 删除该文件夹下所有文件以delEndName为后缀的文件（不包含子文件夹里的文件）
                    // if (delFile != null) {//
                    // 删除该文件夹下所有文件以delEndName为后缀的文件（包含子文件夹里的文件）
                        deleteEndFile(delFile.toString(), delEndName);
                    } else {
                        // nothing
                    }
                }
            } else if (file.isFile()) {

                // check the end name
                if (file.toString().contains(".")
                        && file.toString()
                                .substring(
                                        (file.toString().lastIndexOf(".") + 1))
                                .equals(delEndName)) {
                    // file delete
                    file.delete();
                }
            }
        }
    } catch (Exception ex) {
        if (LogUtils.DEBUG) {
            LogUtils.e(ex);
        }
        return false;
    }
    return true;
}

/**
 * 删除文件夹内所有文件
 *
 * @param delpath
 *            delpath path of file
 * @return boolean the result
 */
public static boolean deleteAllFile(String delpath) {
    try {
        // create file
        final File file = new File(delpath);

        if (!file.isDirectory()) {
            file.delete();
        } else if (file.isDirectory()) {

            final String[] filelist = file.list();
            final int size = filelist.length;
            for (int i = 0; i < size; i++) {

                // create new file
                final File delfile = new File(delpath + "/" + filelist[i]);
                if (!delfile.isDirectory()) {
                    delfile.delete();
                } else if (delfile.isDirectory()) {
                    // digui
                    deleteFile(delpath + "/" + filelist[i]);
                }
            }
            file.delete();
        }
    } catch (Exception ex) {
        if (LogUtils.DEBUG) {
            LogUtils.e(ex);
        }
        return false;
    }
    return true;
}

/**
 * 删除目录（文件夹）以及目录下的文件
 *
 * @param sPath
 *            被删除目录的文件路径
 * @return 目录删除成功返回true，否则返回false
 */
public static boolean deleteDirectory(String sPath) {

    if (TextUtils.isEmpty(sPath)) {
        return false;
    }

    boolean flag;
    // 如果sPath不以文件分隔符结尾，自动添加文件分隔符
    if (!sPath.endsWith(File.separator)) {
        sPath = sPath + File.separator;
    }
    final File dirFile = new File(sPath);
    // 如果dir对应的文件不存在，或者不是一个目录，则退出
    if (!dirFile.exists() || !dirFile.isDirectory()) {
        return false;
    }
    flag = true;
    // 删除文件夹下的所有文件(包括子目录)
    final File[] files = dirFile.listFiles();
    if (files != null && files.length > 0) {
        for (int i = 0; i < files.length; i++) {
            // 删除子文件
            if (files[i].isFile()) {
                flag = deleteFile(files[i].getAbsolutePath());
                if (!flag)
                    break;
            } // 删除子目录
            else {
                flag = deleteDirectory(files[i].getAbsolutePath());
                if (!flag)
                    break;
            }
        }
    }
    if (!flag)
        return false;
    // 删除当前目录
    if (dirFile.delete()) {
        return true;
    } else {
        return false;
    }
}

 /**
 * 获取后缀名
 *
 * @param path
 *            全路径
 * @return
 */
public static String getFileExtName(String path) {
    String ext = "";
    if ((path != null) && (path.length() > 0)) {
        int dot = path.lastIndexOf('.');
        if ((dot > -1) && (dot < (path.length() - 1))) {
            ext = path.substring(dot + 1);
        }
    }
    return ext;
}

/**
 * 获取文件名
 *
 * @param path
 *            全路径
 * @return
 */
public static String getFileName(String path) {
    if (!TextUtils.isEmpty(path)) {
        return path.substring(path.lastIndexOf(File.separator) + 1);
    }
    return "";
}

/**
 * 获取文件所在的文件路径
 *
 * @param path
 * @return
 */
public static String getFilePath(String path) {
    return path.substring(0, path.lastIndexOf(File.separator) + 1);
}

/**
 * 复制文件
 *
 * @param srcPath : 源文件全路径
 * @param destPath : 目标文件全路径
 * @return
 */
public static long copyFile(String srcPath, String destPath) {
    try {
        int position = destPath.lastIndexOf(File.separator);
        String dir = destPath.substring(0, position);
        String newFileName = destPath.substring(position+1);
        final File cacheDir = new File(dir);
        if (!cacheDir.exists()) {
            cacheDir.mkdirs();
        }
        return copyFile(new File(srcPath), new File(dir), newFileName);
    } catch (Exception e) {
        return 0;
    }

}

/**
 * 复制文件(以超快的速度复制文件)
 *
 * @param srcFile
 *            源文件File
 * @param destDir
 *            目标目录File
 * @param newFileName
 *            新文件名
 * @return 实际复制的字节数，如果文件、目录不存在、文件为null或者发生IO异常，返回-1
 */
@SuppressWarnings("resource")
public static long copyFile(final File srcFile, final File destDir, String newFileName) {
    long copySizes = 0;
    if (!srcFile.exists()) {
       if (LogUtils.DEBUG) {
           LogUtils.d("源文件不存在");
       }
        copySizes = -1;
    } else if (!destDir.exists()) {
        if (LogUtils.DEBUG) {
            LogUtils.d("目标目录不存在");
        }
        copySizes = -1;
    } else if (newFileName == null) {
        if (LogUtils.DEBUG) {
             LogUtils.d("文件名为null");
         }
        copySizes = -1;
    } else {
        FileChannel fcin = null;
        FileChannel fcout = null;
        try {
            fcin = new FileInputStream(srcFile).getChannel();
            fcout = new FileOutputStream(new File(destDir, newFileName)).getChannel();
            long size = fcin.size();
            fcin.transferTo(0, fcin.size(), fcout);
            copySizes = size;
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (fcin != null) {
                    fcin.close();
                }
                if (fcout != null) {
                    fcout.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    return copySizes;
}


/**
 * 判断asset下是否存在某个文件
 *
 * @param context
 * @param fileName
 *            如:aa.txt或image/aa.jpg
 * @return
 */
public static boolean existInAsset(Context context, String fileName) {
    boolean exist = false;
    try {
        String[] u = context.getAssets().list(getFilePath(fileName));
        for (String item : u) {
            if (item.equals(getFileName(fileName))) {
                exist = true;
                break;
            }
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
    return exist;
}

/**
 * 获取目录文件个数
 *
 * @param f
 * @return
 */
public static long getlist(File f) {
    long size = 0;
    try {
        File flist[] = f.listFiles();
        size = flist.length;
        for (int i = 0; i < flist.length; i++) {
            final File file = flist[i];
            if (file == null) {
                continue;
            }
            if (file.isDirectory()) {
                size = size + getlist(file);
                size--;
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return size;
}

/**
 * 获取文件夹下所有文件大小
 *
 * @param f
 * @return
 */
public static long getFileSize(File f) {
    long size = 0;
    try {
        File flist[] = f.listFiles();
        for (int i = 0; i < flist.length; i++) {
            final File file = flist[i];
            if (file == null) {
                continue;
            }
            if (file.isDirectory()) {
                size = size + getFileSize(file);
            } else {
                size = size + file.length();
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return size;
}

/**
 * 调用此方法自动计算指定文件或指定文件夹的大小
 *
 * @param filePath 文件路径
 * @return 计算好的带B、KB、MB、GB的字符串
 */
public static String getAutoFileOrFilesSize(File file) {
    if (file == null) {
        return "0B";
    }

    final long blockSize = getFileSize(file);

    if (LogUtils.DEBUG) {
        LogUtils.d("getAutoFileOrFilesSize 文件大小：" + blockSize);
    }

    return FormetFileSize(blockSize);
}

/**
 * 转换文件大小
 * @param fileS
 * @return
 */
private static String FormetFileSize(long fileS) {
    final DecimalFormat df = new DecimalFormat("#.00");
    String fileSizeString = "";
    String wrongSize = "0B";
    if (fileS == 0) {
        return wrongSize;
    }
    if (fileS < 1024) {
        fileSizeString = df.format((double) fileS) + "B";
    } else if (fileS < 1048576) {
        fileSizeString = df.format((double) fileS / 1024) + "KB";
    } else if (fileS < 1073741824) {
        fileSizeString = df.format((double) fileS / 1048576) + "MB";
    } else {
        fileSizeString = df.format((double) fileS / 1073741824) + "GB";
    }
    return fileSizeString;
}

/**
 * 将字符串写入到文本文件中
 *
 * @param strcontent
 */
public static void writeFileSdcard(String strcontent) {
    SimpleDateFormat formatter = new SimpleDateFormat("yyyy年MM月dd日   HH:mm:ss");
    Date curDate = new Date(System.currentTimeMillis());// 获取当前时间
    String str = formatter.format(curDate);
    // 每次写入时，都换行写
    String strContent = "-------当前时间===" + str + "\r\n" + strcontent + "\r\n";
    try {
        String strFilePath = Environment.getExternalStorageDirectory() + "/lunxun.text";

        File file = new File(strFilePath);
        if (!file.exists()) {
            Log.d("TestFile", "Create the file:" + strFilePath);
            file.createNewFile();
        }
        RandomAccessFile raf = new RandomAccessFile(file, "rw");
        raf.seek(file.length());
        raf.write(strContent.getBytes());
        raf.close();
    } catch (Exception e) {
        Log.e("TestFile", "Error on write File.");
    }
}

}