(new File("/sdcard/Download")).list()为什么拿不到所有的文件?

Question

小米手机,文件夹中内容如下:

127|umi:/sdcard/Download $ ls -la
total 27033
drwxrwx--- 2 root everybody     3488 2021-10-04 13:33 .adp
-rw-rw---- 1 root everybody       97 2021-09-22 17:25 .common
drwxrwx--- 2 root everybody     3488 2021-10-04 13:33 .private
drwxrwx--- 2 root everybody     3488 2021-10-04 13:33 .private_torrent
drwxrwx--- 2 root everybody     3488 2021-10-04 13:33 .private_video
-rw-rw---- 1 root everybody       96 2022-01-10 07:47 .td-3
-rw-rw---- 1 root everybody       88 2022-01-10 07:47 .tdck
-rw-rw---- 1 root everybody      148 2022-03-07 09:11 .thumbcache_001
-rw-rw---- 1 root everybody       88 2022-01-07 07:46 .thumbcache_idx_001
-rw-rw---- 1 root everybody       88 2022-02-11 08:29 .thumbcache_idx_McqWd0osIPezODQX95O1
drwxrwx--- 3 root everybody     3488 2022-04-25 11:55 QQBrowser
drwxrwx--- 2 root everybody     3488 2022-04-17 01:22 app
-rw-rw---- 1 root everybody 13771588 2022-04-25 08:53 shengxu.txt
-rw-rw---- 1 root everybody    50839 2021-09-23 22:37 test_en.jpg
drwxrwx--- 2 root everybody     3488 2022-04-24 10:36 thumbs
-rw-rw---- 1 root everybody 13771588 2022-04-25 08:53 圣墟.txt

 

在Application的OnCreate函数中使用(new File("/sdcard/Download")).list()能拿到的内容如下:

0 = {File@19891} "/sdcard/Download/test_en.jpg"
1 = {File@19892} "/sdcard/Download/.adp"
2 = {File@19893} "/sdcard/Download/.private"
3 = {File@19894} "/sdcard/Download/app"
4 = {File@19895} "/sdcard/Download/.private_video"
5 = {File@19896} "/sdcard/Download/thumbs"
6 = {File@19897} "/sdcard/Download/QQBrowser"
7 = {File@19898} "/sdcard/Download/.private_torrent"

一共16个文件,为啥只列出了8个?读写存储的权限也开启了啊