Re: FYI: How to reliably identify an Android Tablet microSD Card
Interesting approach. Of course, the downside is that if anything changes, the
method becomes ineffective for that new device or for all andriods if the
change is fundamental enough.
Bob S
> On Dec 19, 2018, at 03:37 , Peter Reid via use-livecode
> wrote:
>
> FYI
>
> I've managed to put together some code that reliably locates the microSD card
> in 4 very different Android-based tablets. The approach involves 3 different
> methods:
>
> 1. Search for a known folder on the SD card starting in the standard "/mnt"
> folder using a breadth-first search strategy.
>
> 2. Search for a known folder on the SD card starting in the less standard
> "/storage" folder using a breadth-first search strategy.
>
> 3. Search for a known folder using full paths that are used by specific
> manufacturers. These look as though they should be located by method 1. (they
> are all paths from "/mnt") but sometimes fail 1. however they work if the
> full path is specified!
>
> Here's my code for "findSDcard"...
>
>
>
> on findSDcard
> constant \
> cSDcardRoot1 = "/mnt/ext_sdcard/Android/data/com.myorg.myapp/files", \
> cSDcardRoot2 = "/mnt/sdcard2/Android/data/com.myorg.myapp/files", \
> cSDcardRoot3 = "/mnt/m_external_sd/Android/data/com.myorg.myapp/files", \
> cSDcardRoot4 = "/mnt/sdcard/Android/data/com.myorg.myapp/files", \
> cSDcardRoot5 = "/mnt/extSdCard/Android/data/com.myorg.myapp/files", \
> cSDcardRoot6 = "/mnt/external_sd/Android/data/com.myorg.myapp/files", \
> cSDcardRoot7 = "/mnt/SDCard/Android/data/com.myorg.myapp/files"
>
>global gDataPath -- /myapp-data
>global gSDcard -- path to app's data folder
>
> set wholeMatches to true
> put empty into gSDcard
> put (char 2 to -1 of gDataPath) into tTargetFolderName
> if the platform is "android" then
> put "/mnt" into tDeviceRoot
> if there is a folder tDeviceRoot then
> -- search in standard /mnt folders:
> put empty into tFoundPath
> folderExists tTargetFolderName, tDeviceRoot, tFoundPath
> if tFoundPath is not empty then
>put tFoundPath into gSDcard
> end if
> end if
> if gSDcard is empty then
> -- try non-standard /storage folders:
> if there is a folder "/storage" then
>-- search in non-standard /storage folders:
>put "/storage" into tDeviceRoot
>put empty into tFoundPath
>folderExists tTargetFolderName, tDeviceRoot, tFoundPath
>if tFoundPath is not empty then
> put tFoundPath into gSDcard
>end if
> end if
> end if
> if gSDcard is empty then
> -- try bespoke SD locations:
> if there is a folder cSDcardRoot1 then
>put cSDcardRoot1 into gSDcard-- Huawei
> else if there is a folder cSDcardRoot2 then
>put cSDcardRoot2 into gSDcard-- Amazon
> else if there is a folder cSDcardRoot3 then
>put cSDcardRoot3 into gSDcard-- Lenovo
> else if there is a folder cSDcardRoot4 then
>put cSDcardRoot4 into gSDcard-- Fusion
> else if there is a folder cSDcardRoot5 then
>put cSDcardRoot5 into gSDcard-- ??
> else if there is a folder cSDcardRoot6 then
>put cSDcardRoot6 into gSDcard-- ??
> else if there is a folder cSDcardRoot7 then
>put cSDcardRoot7 into gSDcard-- Hudl?
> end if
> end if
> end if
> end findSDcard
>
> on folderExists pFolderName, pRootPath, @pFoundPath
> constant cNoDotsRegex = "^\..*"
>
> -- breadth-first search for a given folder
> put empty into pPath
> if there is a folder pRootPath then
> put empty into tSubFolders
> put folders(pRootPath) into tFolderList
> filter lines of tFolderList without regex cNoDotsRegex
> repeat for each line tFolder in tFolderList
> if tFolder = pFolderName then
>-- found it:
>put pRootPath into pFoundPath
>exit folderExists
> else
>-- add sub-folder to list for checking:
>put pRootPath & "/" & tFolder & return after tSubFolders
> end if
> end repeat
> if tSubFolders is empty then
> exit folderExists
> end if
> repeat for each line tSubFolder in tSubFolders
> folderExists pFolderName, tSubFolder, pFoundPath
> if pFoundPath is not empty then
>exit folderExists
> end if
> end repeat
> end if
> end folderExists
>
>
>
> Note that the above was necessary because specialFolderPath("external
> documents") doesn't work reliably across the 4 Android-based tablets I'm
> trying to support.
>
> If anyone has a more elegant or succinct method, please let me know. In the
> meantime you're welcome to use the above code.
>
> Peter
> --
> Peter Reid
> Loughborough, UK
>
>> On 28 Nov 201
FYI: How to reliably identify an Android Tablet microSD Card
FYI
I've managed to put together some code that reliably locates the microSD card
in 4 very different Android-based tablets. The approach involves 3 different
methods:
1. Search for a known folder on the SD card starting in the standard "/mnt"
folder using a breadth-first search strategy.
2. Search for a known folder on the SD card starting in the less standard
"/storage" folder using a breadth-first search strategy.
3. Search for a known folder using full paths that are used by specific
manufacturers. These look as though they should be located by method 1. (they
are all paths from "/mnt") but sometimes fail 1. however they work if the full
path is specified!
Here's my code for "findSDcard"...
on findSDcard
constant \
cSDcardRoot1 = "/mnt/ext_sdcard/Android/data/com.myorg.myapp/files", \
cSDcardRoot2 = "/mnt/sdcard2/Android/data/com.myorg.myapp/files", \
cSDcardRoot3 = "/mnt/m_external_sd/Android/data/com.myorg.myapp/files", \
cSDcardRoot4 = "/mnt/sdcard/Android/data/com.myorg.myapp/files", \
cSDcardRoot5 = "/mnt/extSdCard/Android/data/com.myorg.myapp/files", \
cSDcardRoot6 = "/mnt/external_sd/Android/data/com.myorg.myapp/files", \
cSDcardRoot7 = "/mnt/SDCard/Android/data/com.myorg.myapp/files"
global gDataPath -- /myapp-data
global gSDcard -- path to app's data folder
set wholeMatches to true
put empty into gSDcard
put (char 2 to -1 of gDataPath) into tTargetFolderName
if the platform is "android" then
put "/mnt" into tDeviceRoot
if there is a folder tDeviceRoot then
-- search in standard /mnt folders:
put empty into tFoundPath
folderExists tTargetFolderName, tDeviceRoot, tFoundPath
if tFoundPath is not empty then
put tFoundPath into gSDcard
end if
end if
if gSDcard is empty then
-- try non-standard /storage folders:
if there is a folder "/storage" then
-- search in non-standard /storage folders:
put "/storage" into tDeviceRoot
put empty into tFoundPath
folderExists tTargetFolderName, tDeviceRoot, tFoundPath
if tFoundPath is not empty then
put tFoundPath into gSDcard
end if
end if
end if
if gSDcard is empty then
-- try bespoke SD locations:
if there is a folder cSDcardRoot1 then
put cSDcardRoot1 into gSDcard-- Huawei
else if there is a folder cSDcardRoot2 then
put cSDcardRoot2 into gSDcard-- Amazon
else if there is a folder cSDcardRoot3 then
put cSDcardRoot3 into gSDcard-- Lenovo
else if there is a folder cSDcardRoot4 then
put cSDcardRoot4 into gSDcard-- Fusion
else if there is a folder cSDcardRoot5 then
put cSDcardRoot5 into gSDcard-- ??
else if there is a folder cSDcardRoot6 then
put cSDcardRoot6 into gSDcard-- ??
else if there is a folder cSDcardRoot7 then
put cSDcardRoot7 into gSDcard-- Hudl?
end if
end if
end if
end findSDcard
on folderExists pFolderName, pRootPath, @pFoundPath
constant cNoDotsRegex = "^\..*"
-- breadth-first search for a given folder
put empty into pPath
if there is a folder pRootPath then
put empty into tSubFolders
put folders(pRootPath) into tFolderList
filter lines of tFolderList without regex cNoDotsRegex
repeat for each line tFolder in tFolderList
if tFolder = pFolderName then
-- found it:
put pRootPath into pFoundPath
exit folderExists
else
-- add sub-folder to list for checking:
put pRootPath & "/" & tFolder & return after tSubFolders
end if
end repeat
if tSubFolders is empty then
exit folderExists
end if
repeat for each line tSubFolder in tSubFolders
folderExists pFolderName, tSubFolder, pFoundPath
if pFoundPath is not empty then
exit folderExists
end if
end repeat
end if
end folderExists
Note that the above was necessary because specialFolderPath("external
documents") doesn't work reliably across the 4 Android-based tablets I'm trying
to support.
If anyone has a more elegant or succinct method, please let me know. In the
meantime you're welcome to use the above code.
Peter
--
Peter Reid
Loughborough, UK
> On 28 Nov 2018, at 11:49am, Peter Reid wrote:
>
> I've got an app running on an Android 8.1 7in tablet which uses a microSD
> card for its RW data storage. I've tried using:
>
> specialFolderPath("external documents")
>
> which the docs describe as follows:
>
> • "external documents": The folder on the primary shared/external
> storage device where application-specific data can be placed
> but this doesn't point to the
