在检查文件夹是否存在或列出其子文件夹之前，我是否必须检查 READ_EXTERNAL_STORAGE

Question

I know that READ_EXTERNAL_STORAGE is needed to read files outside app storage, but how about folders. The official documentation ( https://developer.android.com/reference/android/Manifest.permission#READ_EXTERNAL_STORAGE ) isn't very clear and other sources online are not helpful either. Do I have to check this permission before I check if some specific folder exists and what subfolders does it have?

Answer 1

As @blackapps suggested, checking if any folder exists works always without permission on API 23 device. Listing contents (subfolders) is more complicated:

• root and its subfolders (/): works without permissions
• user storage root and its subfolders (/storage/emulated/0, /sotrage/sdcard1, ...): needs permission

Still I'd like to know more universal answer.