问题
There has been written a lot about Kitkat external sdcard write permission but it's not clear to me how it works. Unfortunately I don't have Kitkat device with sdcard slot. Question is, can I write to secondary external storage at all? Based on the docs.
Apps must not be allowed to write to secondary external storage devices, except in their package-specific directories
If in understand it, If I don't have permission I can write to the app specific folder on primary external storage /sdcard/Android/data/package/... and to the app specific folder on secondary external storage /extSdcard/Android/data/package/...
and with WRITE_EXTERNAL_STORAGE I can write to all locations on primary external storage /sdcard/* but I can't write to any location on secondary external storage (except app specific folder)?
Thanks for all answers!
回答1:
Your analysis is correct, other than assuming that primary external storage is /sdcard (the exact path varies by device, OS level, and user account for Android 4.2+ tablets).
Here are some blog posts that I wrote recently on external storage and removable ("secondary external") storage.
回答2:
I know this topic is old but this may help. You should use this method.
System.getenv();
see project Environment3 to access all storage that is connected to your device.
https://github.com/omidfaraji/Environment3
来源：https://stackoverflow.com/questions/23199954/android-4-4-kitkat-and-second-external-storage