【Android笔记】Android统计文件夹大小，删除文件夹下的所有文件方法

1、获取文件夹大小：

 1 /**    2      * 获取文件夹大小    3      * @param file File实例    4      * @return long       5      */      6     public static long getFolderSize(java.io.File file){     7     8         long size = 0;     9         try {  10             java.io.File[] fileList = file.listFiles();     11             for (int i = 0; i < fileList.length; i++)     12             {     13                 if (fileList[i].isDirectory())     14                 {     15                     size = size + getFolderSize(fileList[i]);    16    17                 }else{     18                     size = size + fileList[i].length();    19    20                 }     21             }  22         } catch (Exception e) {  23             // TODO Auto-generated catch block  24             e.printStackTrace();  25         }     26        //return size/1048576;    27         return size;    28     }

2、删除文件夹下所有文件：

 1 /**    2      * 删除指定目录下文件及目录     3      * @param deleteThisPath    4      * @param filepath    5      * @return     6      */      7     public void deleteFolderFile(String filePath, boolean deleteThisPath) {      8         if (!TextUtils.isEmpty(filePath)) {      9             try {  10                 File file = new File(filePath);     11                 if (file.isDirectory()) {// 处理目录     12                     File files[] = file.listFiles();     13                     for (int i = 0; i < files.length; i++) {     14                         deleteFolderFile(files[i].getAbsolutePath(), true);     15                     }      16                 }     17                 if (deleteThisPath) {     18                     if (!file.isDirectory()) {// 如果是文件，删除     19                         file.delete();     20                     } else {// 目录     21                    if (file.listFiles().length == 0) {// 目录下没有文件或者目录，删除     22                             file.delete();     23                         }     24                     }     25                 }  26             } catch (Exception e) {  27                 // TODO Auto-generated catch block  28                 e.printStackTrace();  29             }     30         }     31     }

3、格式化文件夹大小单位：

 1 /**  2      * 格式化单位  3      * @param size  4      * @return  5      */   6     public static String getFormatSize(double size) {   7         double kiloByte = size/1024;   8         if(kiloByte < 1) {   9             return size + "B";  10         }  11           12         double megaByte = kiloByte/1024;  13         if(megaByte < 1) {  14             BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));  15             return result1.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "KB";  16         }  17           18         double gigaByte = megaByte/1024;  19         if(gigaByte < 1) {  20             BigDecimal result2  = new BigDecimal(Double.toString(megaByte));  21             return result2.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "MB";  22         }  23           24         double teraBytes = gigaByte/1024;  25         if(teraBytes < 1) {  26             BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));  27             return result3.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "GB";  28         }  29         BigDecimal result4 = new BigDecimal(teraBytes);  30         return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "TB";  31     }

参考原文：http://blog.csdn.net/nn955/article/details/36176429

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