Android查看文件夾大小以及刪除文件夾的工具類

import android.text.TextUtils;

import java.io.File;
import java.math.BigDecimal;


public class StorageCleanUtils {

 /**
  * 獲取文件夾大小(遞歸)
  *
  * @param file File實例
  * @return long
  */
 public static long getFolderSize(java.io.File file) {

  long size = 0;
  try {
   java.io.File[] fileList = file.listFiles();
   for (int i = 0; i < fileList.length; i++) {
    if (fileList[i].isDirectory()) {
     size = size + getFolderSize(fileList[i]);

    } else {
     size = size + fileList[i].length();

    }
   }
  } catch (Exception e) {
   e.printStackTrace();
  }
  return size;
 }


 /**
  * 獲取當前文件夾大小，不遞歸子文件夾
  *
  * @param file
  * @return
  */
 public static long getCurrentFolderSize(File file) {
  long size = 0;
  try {
   java.io.File[] fileList = file.listFiles();
   for (int i = 0; i < fileList.length; i++) {
    if (fileList[i].isDirectory()) {
     //跳過子文件夾

    } else {
     size = size + fileList[i].length();

    }
   }
  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  return size;
 }


 /**
  * 刪除指定目錄下文件及目錄
  *
  * @param deleteThisPath
  * @param filePath
  * @return 
  */
 public static boolean deleteFolderFile(String filePath, boolean deleteThisPath) {
  if (!TextUtils.isEmpty(filePath)) {
   try {
    File file = new File(filePath);
    if (file.isDirectory()) {// 處理目錄
     File files[] = file.listFiles();
     for (int i = 0; i < files.length; i++) {
      deleteFolderFile(files[i].getAbsolutePath(), true);
     }
    }
    if (deleteThisPath) {
     if (!file.isDirectory()) {// 如果是文件，刪除
      file.delete();
     } else {// 目錄
      if (file.listFiles().length == 0) {// 目錄下沒有文件或者目錄，刪除
       file.delete();
      }
     }
    }
    return true;
   } catch (Exception e) {
    e.printStackTrace();
    return false;
   }
  }
  return false;
 }


 /**
  * 刪除指定目錄下文件
  *
  * @param filePath
  * @return
  */
 public static void deleteFile(String filePath) {
  if (!TextUtils.isEmpty(filePath)) {
   try {
    File file = new File(filePath);
    java.io.File[] fileList = file.listFiles();
    for (int i = 0; i < fileList.length; i++) {
     if (!fileList[i].isDirectory()) {
      fileList[i].delete();
     }
    }
   } catch (Exception e) {
    e.printStackTrace();
   }
  }
 }


 /**
  * 格式化單位
  *
  * @param size
  * @return
  */
 public static String getFormatSize(double size) {
  double kiloByte = size / 1024;
  if (kiloByte < 1) {
   return size + "Byte(s)";
  }

  double megaByte = kiloByte / 1024;
  if (megaByte < 1) {
   BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));
   return result1.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "KB";
  }

  double gigaByte = megaByte / 1024;
  if (gigaByte < 1) {
   BigDecimal result2 = new BigDecimal(Double.toString(megaByte));
   return result2.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "MB";
  }

  double teraBytes = gigaByte / 1024;
  if (teraBytes < 1) {
   BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));
   return result3.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "GB";
  }
  BigDecimal result4 = new BigDecimal(teraBytes);
  return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "TB";
 }

}