Offline maps list is empty

Matthew Crozier shared this problem 52 days ago
Known

The Offline maps page falsely shows "Nothing here yet". See attached screenshot.

I have tried uninstalling then reinstalling Locus Map Classic from scratch, then downloading LoMaps (New Zealand, East) again. Also importing NZ topo maps will not show on the list.

I can see these stored on the SD card when the card is in my PC. But it makes no difference whether I set the Default Main Directory to Internal storage or SD card. The offline map is displayed when downloaded, but can no longer be selected again if you change the map.

The waypoints and tracks databases are also on the SD card, and do show on the map and in Points Manager. However, Exporting any of these does not work. The process is 'successful', but no export file is generated.

Also, Backup files are not generated. Unload App Data process fails - see attached screenshot.

Locus Map Classic v 3.62 - see attached About screen.

Xcover 4s, Android 11, Kernel 4.4.177-23020803, Android security patch July 1st 2022


Is there a way to switch maps without using the Offline maps page?


Cheers, Matt.

Replies (12)

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Hello,

I suppose you have a similar problem like this: Loss of data after update/data transfer.

On your last screenshot, there are three working directories and I think this could be the problem.

I recommend uninstalling Locus completely and deleting all of the folders of Locus from the phone.

Then reinstall into the private directory in internal memory (and if you need, set the custom sub-directories then).

Start the Locus and check if there is everything as it should. There should be no "sdcard/Locus" in use.

If everything works, try to download any LoMap from the store (previously purchased could be downloaded for free) and check if it works and if it is downloaded to the correct directory.

If so, you can download the rest.

If you restore your backup, it is possible that it could break everything again, so be prepared to repeat this procedure again or restore everything manually and don't restore your settings from the backup.

This problem of duplicated folders appears on a few devices and it is quite random. We still don't know why it happens.

If you need more information, feel free to ask me.


Zdenek, Locus team

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I also have the same problem either since the last LocusMaps Pro (Classic) update (from around July 22) or the latest Android 11 update (Security Patch Level June 2022) on a Galaxy Tab Active Pro SM-T540


The last selected map (a mbtiles) still works (loads the tiles as expected) but the displays in LocusMaps are empty and I cannot select one of the other maps stored in the SD card's private locus directory.

What is also interesting is, that when I click the + button on the offline maps section, select the import option and then the "Hauptverzeichnis" ("Main directory"?) - I only get an empty file picker, as if locus wouldn't have any directory listing rights there...?

I also have the /Locus directory listed from an earlier install.

I prefer not to uninstall and reinstall it, as reinstalling 60GB of mbtiles maps is just hours of work...

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Hi Zdenek and Matthias,

Thanks for the advice.

Hmm, it's curious that sdcard/Locus was was set as a Supplementary Directory after a fresh install. That directory hasn't existed since I had to make a private folder for Locus Map to work with Android 11. I don't think it was specified in any of the directory settings, so not sure where it got that from.

Anyway, I uninstalled Locus Map completely and made sure that no menion or Locus directories existed anywhere (using X-plore, and the card reader in my PC). Then reinstalled Locus Map Classic and, without changing any default directory settings, downloaded LoMap NZ East to internal storage. This works fine and shows in the Offline Maps list - see screenshot.

I then set the Main Directory to the Private folder on SD card. I was expecting this to move the LoMap to the SD card and take a while, but it was very quick and the LoMap remains in internal storage. However it still shows as available in the Offline maps list. Attached is a screenshot of the About page, showing the emulated SD card as a Supplementary Directory. It also no longer shows sdcard/Locus as a Supplementary Directory :).

I then tried to import the NZ topo tile maps. This did get copied to the private folder on the SD card, and was initially viewable, but is not recognised in the Offline maps list!

So I agree with Matthias, it seems that from a recent update, Locus Map can no longer recognise maps in the private folder on the SD card. I'm also shown an empty folder when trying to import another map from the Main Directory.

I haven't got enough internal storage to store the tile maps there. Is an SD card solution possible?

Cheers, Matt.

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I think I have a solution!

Locus Map Classic creates a non-private menion.android.locus.pro folder under Android/media on the SD card. I moved the tile maps out of the private folder on the SD card, and the LoMaps out of internal storage, into their respective positions into this media folder - and it seems to work! See screenshot.

Thanks for the help :)

Matt.

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Yes, this works! Matthew, You are the best!

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Hello, please, what device and what system are you using?

Do you have the original ROM, or some custom (e.g. Lineage)?

If the "media" works, then "data" should work the same way.


Zdenek, Locus team

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Hi, I'm using the Samsung Galaxy Xcover 4s, Android 11.

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And I have the original ROM.

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Yes, same - Samsung Galaxy Xcover 4s, Android 11, Kernel 4.4.177-23020803, Android security patch July 1st 2022.


A difference between 'data' and 'media' is that data is private. It appears that apps now don't have write access to even their own private folders on the sdcard!?


I still can't export tracks and waypoints though. I presume this might be because Locus Maps constructs the export file locally in its private folder first before moving it to the selected destination.


Cheers Matt.

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Hello,

we are unable to simulate this issue, but we have noticed a similar issue with some Samsung devices before.

And for a few last weeks, there are many issues related to the Xcover 4s.

In this case, I am afraid that this error is device-specific and we are unable to avoid this.

We'll try to collect more feedback from other users... or Samsung (hopefully) will release any patch.

Please if it works, use the "Android/media" folder for maps for now.

I am sorry I can't help you more.

Regards,


Zdenek, Locus team

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What about implementing a storage switch in the app to select the directory on the SD card (data or media)? That shouldn't be a big problem.

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Samsung Galaxy Xcover 4s is the device, as in

https://help.locusmap.eu/topic/29156-offline-maps-list-is-empty

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@Zdenek: Menion CAN help, I suppose:

I definitely advise to offer /Android/media as a folder home for any custom sub-directories. Why? Android/media seems safe from Google restriction insanities so far. Other apps can access those structures, PCs as well, despite vendor hassle around /Android/data (I guess above specialiity is a Samsung "feature" for this device type, and other vendors may screw up, too). And this /Android/media should become the recommended (best practise) location for mass data.

(copy from https://help.locusmap.eu/topic/29219-findings-from-case-28548-resolution-locus-unable-to-work-with-ext-sd-private-folder)

I even would go so far to streamline the initial Locus (non-AFA) setup to this combination:

- INT SD /Android/data base folder

- EXT SD (if such exists) /Android/media as default folder for maps, mapsVector and SRTM, otherwise INT SD /Android/media

Show that choice to "OK" and add another line "Expert settings" where people have other choices, and the sub-directory choices should be offered right there - for the Experts.

Non-geeks cannot judge the hidden consequences of their choices, so a full best practise setup should be one-click, also for the sub-directories.

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Thanks for the advise Zdenek and Michael!

I see some commentary on the Samsung forums about their last security update in July, so I suspect that might have something to do with it too.

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Hello Matthew,

you are probably 5+ user this month who report any (not just file-system) problem with Samsung XCover 4s, weird. There seems to be something really wrong with this device.

I've now created an option to set the default directory into the Android/media directory for all types of maps as mentioned @Michael Bechtold. It will need some testing on our side (and Beta testers) anyway this feature should be available in the next app version in September.

Jiří M. aka Menion

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Hi Menion,


Thanks for implementing that solution. The Xcover problem seems to affect anything in the private sdcard folder, including export work files and waypoints. Eg, I couldn't see geocache hints last weekend.


I don't think the Xcover gets the same attention at Samsung as their main Galaxy series of phones. :(


Thanks for your help.

Matt

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Great news, Menion!

And I hope it will not be in a private sub-structure, but in a freely definable folder.

Which also would survive a (temp.) de-install of Locus. AND it would allow LMP und LM4 to use the same maps ...

Good luck and cheers

Michael

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Nope, sorry, it does not work like this. App needs to store it's own data in Android/media/menion.android.locus(.pro) directory to make it work as I need.

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