I use several different apps on my smartphone with the same set of mapsforge maps e.g.
Normally I download the maps from OpenAndroMaps on my PC an copy it on my phone.
The maps are stored in one location. On my phone in the locus/mapsvector folder.
In the apps mentioned above I can set the offline maps path to my custom folder, et voila, I use the same mapfiles and save space on my phone. I addition, I have to update the maps online once and not for each app.
Would be nice if it would be possible to select own path for offline maps.
Customer support service by UserEcho