Android Question Custom, local tiles with OSMDroid

[zava]

Hello,
I am investigating the possibility of using the OSMDroid wrap for a simple app, although it seems frozen at V4 while the original has moved to V6 (my main purpose is to remain in the B4X environment vs. the Android Studio mess...)

I therefore need to understand if/how OsmDroid could use tiles or files created from digitized/georeferenced images (scans from historical maps). I Understand they may be produced with MapTiler or similar tool and used in place of downloaded/cached tiles.

• Can OsmDroid load such tiles?
• What files should be produced and where should they be stored?
• How should they be loaded?

It appears that original OsmDroid V6 can do this, but I haven't been able to locate this for the B4X wrap which seems to only use downloaded or cached tyles.

Thank you for any help!

 

[TILogistic]

I have seen your questions in the forum and what you want to do.

I suggest you check out the B4Xmap class.

this class uses the tiles that it downloads to a database (SQLlite) simulating the cache.

Review it and adapt it to your needs.

Open Street Map viewer - GPS

Hi, This b4Xlib contains a custom view (cvMap) which can display Open Street Map. The tiles are retrieved from the internet and cached in a database. You can add shapes and images on the map. UI : - Lat/lng Center of the map - Zoom Level - Compass Direction with rotation - Scale - Button...

www.b4x.com

note:
.B4Xlib is Zip

 

[zava]

Thank you @oparra
I had seen that thread and library, but as far as I can understand (not much, unfortunately...) it appeared that B4XPages could store tiles that it had previously downloaded and cahe them.
What I need instead is to get MY maps/tiles to be displayed, not maps that were previously downloaded.
I have images from maps that I can georeference and convert to tiles (MapTiler or similar), but they don't come from a server: I must place the file somewhere B4XPage lib can access and display/navigate.

Are you implying that it is possible for B4XPages to somewhat incorporate a local set of tiles and then make it available "as if" it was in the cache?
I haven't seen this in the lib description (but I may easily have missed it...)

Thank you!

 

[TILogistic]

Estimated.
You can adapt the class and display your tiles.

There are other solutions on the forum.

This forum member did something similar.

See:

Map_ax - offline map app

I have done this little APP with the great ScaleImageView library. ScaleImageView library was created by Andrew Graham and link is HERE. I have used also another great B4A libraries: GPS and LibGPX. Map_ax - offline map app. You can use Map_ax Android for to: - display raster maps ( jpg /...

www.b4x.com

B4J offline map app - jpg/jgw

I can not find the offline map app for B4J, therefore I make a little app for it. The app is not perfect but it is at least the beginning. Thank you "Erel", "oparra" and "emexes" for your advices here...

www.b4x.com

B4J Pan ImageView

I would like to pan image loaded into the ImageView. ImageView1 is parent P_map Pane. I have attached my project. My Pan ImageView code is below, but I need to help to amend it. Code is not as to has to be. If someone know solution, please give advice. My code: Sub P_map_MouseDragged...

www.b4x.com

etc.

 

[zava]

Thank you once more @oparra for these suggestions.
Unfortunately, I am not competent enough to dive into taking bits of cofe from disparate libraries, even from other platforms such as J, and adapt them.
MapAx may be a good solution, but developer did not share his source code, so it cannot be instructive to me.
My only chance is to find a dedicated, stable, comprehensive library that does (most of) the job...
B4XMaps does most of the job but doesn't appear to be able to load offline/custom tiles unless cached ones.
OSMDroid might be such a library, but is seems difficult to know if

• Can OsmDroid load offline tiles?
• What tile files should be produced and where should they be stored?
• How should they be loaded?

It seems that original OSMDroid 6.x does all this but it's not available in B4X platform, while it is not known (to me) if the older (and apparently abandoned) OsmDroid 4.x wrapped for B4X can do it.
Of course I could go back to Android Studio and use OSMDroid 6.x, but B4X seems much more user friendly to me...

Thank you for your continued help!