【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     }