I've investigated further the way the Android filing system seems to be
available to LC 9.0.0-dp10. As I reported previously, I have found several
anomalies.
Here's what I've found, (with my app being identified as "com.reidit.aphtrain"
in the examples):
1. The internal storage area pointed to by specialFolderPath("engine") or
specialFolderPath("resources") is Read-Only (RO) and contains any files &
folder specified in Standalone settings to be included in the Copy Files
section. Specifically, the path returned by "engine"/"resources" is:
/data/app/com.reidit.aphtrain-2/base.apk
This can be accessed RO reliably and seems to be the correct behaviour.
2. The internal storage area pointed to by specialFolderPath("documents") is
Read-Write (RW) and can be used as such. However, the path returned by
"documents" is INCORRECT:
/data/data/com.reidit.aphtrain/files
The correct path should be:
/Android/data/com.reidit.aphtrain/files
If I replace the leading "data" with "Android", the path works fully with RW
access.
3. If I pre-load files & folders onto a microSD card on my computer, I have to
place them in a path such as:
/Android/com.reidit.aphtrain/<files & folders>
Such files & folders are Read-Only in the tablet and accessible using the
following path:
/storage/sdcard1/Android/com.reidit.aphtrain/<files & folders>
It seems that Android 5 or later (FireOS 5 in my case) locks down SD cards.
They used to be fully RW but are now treated as mainly RO apart from an area
for the app to use. If I get the path from specialFolderPath("external
documents"), the path gives me Read-Write access to the following area:
/storage/emulated/0/Android/data/com.reidit.aphtrain/files/<files &
folders>
During the running of the app, the above path works fully for RW access but
doesn't show any of the pre-loaded files & folders. However, If I connect the
microSD card to my computer again, this area is NOT VISIBLE!
In summary, we seem to have the following available in LC 9:
WHERE SPECIAL ACCESS TABLET? MAC? PATH
1. internal "engine" RO Yes No
/data/app/com.reidit.aphtrain-2/base.apk
2. internal "documents" RW ERROR No
/data/data/com.reidit.aphtrain/files
3. internal "documents"* RW Yes No
/Android/data/com.reidit.aphtrain/files
4. external "external doc" RW Yes NO
/storage/emulated/0/Android/data/com.reidit.aphtrain/files
5. external "external doc"* RO Yes Yes
/storage/sdcard1/Android/com.reidit.aphtrain
The result of the above is that it is difficult creating files & folders on the
fly that you can get out of the tablet afterwards such that they can be read on
a computer!
Can anyone confirm my findings and make recommendations?
Also, specialFolderPath("documents") seems to have a BUG as it delivers the
wrong path (in LC 9.0.0-dp9/10).
Thanks
Peter
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