Android Open Source - SimpleReader File Utils

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Back to project page SimpleReader.
License

The source code is released under:
Apache License
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Java Source Code

package com.dreamteam.app.utils;
/*w w  w . jav a  2  s .  c o m*/
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import android.os.Environment;

public class FileUtils {
  
  public static boolean hasSDCard() {
    boolean result = false;
    if(Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
      result = true;
    }
    return result;
  }

  public static String getSDRootPath() {
    if (Environment.getExternalStorageState().equals(
        Environment.MEDIA_MOUNTED)) {
      return Environment.getExternalStorageDirectory() + "";
    } else {
      return null;
    }
  }

  /**
   * @description ??????????
   * @param in
   * @param path
   * @param fileName
   * @return boolean
   */
  public static boolean saveToFile(InputStream in, String path,
      String fileName) {
    FileOutputStream out = null;
    byte buffer[] = new byte[4 * 1024];

    File file = new File(path, fileName);
    try {
      file.createNewFile();
      out = new FileOutputStream(file);
      while ((in.read(buffer)) != -1) {
        out.write(buffer);
      }
      return true;
    } catch (IOException e1) {
      e1.printStackTrace();
      return false;
    } finally {
      if (null != out) {
        try {
          out.flush();
          out.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
      if (null != in) {
        try {
          in.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }
  }

  /**
   * ???????????
   * 
   * @param dir
   * @return
   */
  public static long getDirSize(File dir) {
    if (dir == null) {
      return 0;
    }
    if (!dir.isDirectory()) {
      return 0;
    }
    long dirSize = 0;
    File[] files = dir.listFiles();
    for (File file : files) {
      if (file.isFile()) {
        dirSize += file.length();
      } else if (file.isDirectory()) {
        dirSize += file.length();
        dirSize += getDirSize(file); // ????????
      }
    }
    return dirSize;
  }

  /**
   * ?????????
   * 
   * @param fileS
   * @return B/KB/MB/GB
   */
  public static String formatFileSize(long fileS) {
    java.text.DecimalFormat df = new java.text.DecimalFormat("#.00");
    String fileSizeString = "";
    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) + "G";
    }
    return fileSizeString;
  }

  /**
   * ????(???????????)
   * 
   * @param fileName
   * @return
   */
  public static boolean deleteDirectory(String dirName) {
    boolean status;
    SecurityManager checker = new SecurityManager();

    if (!dirName.equals("")) {
      File newPath = new File(dirName);
      checker.checkDelete(newPath.toString());
      if (newPath.isDirectory()) {
        String[] listfile = newPath.list();
        try {
          for (int i = 0; i < listfile.length; i++) {
            File deletedFile = new File(newPath.toString()
                + File.separator + listfile[i].toString());
            deletedFile.delete();
          }
          newPath.delete();
          status = true;
        } catch (Exception e) {
          e.printStackTrace();
          status = false;
        }

      } else
        status = false;
    } else
      status = false;
    return status;
  }

  /**
   * @description ???????????????/??????
   * @param path
   * @return
   */
  public static File newAbsoluteFile(String name) {
    File file = new File(name);
    file.getParentFile().mkdirs();
    try {
      file.createNewFile();
    } catch (IOException e) {
      e.printStackTrace();
    }
    return file;
  }
}
Java Source Code List
