Suggestions

[Efreak]

• use depot downloader
• use steamkit port (not sure if these implement downloads)
  • https://github.com/Longi94/JavaSteam
  • https://github.com/itaysonlab/ksteam
  • https://github.com/DoctorMcKay/node-steam-user is mostly kept up to date, may be usable with electron (or other) "native" app or via nodejs
• if you're going to use a translation layer in a terminal, try qemu-user-x86-64 package for the single steamcmd binary instead of a full installation
• consider using script inside termux that uses eg netcat to parse commands sent by the app, you can access termux storage via standard Android APIs. This way there's no need to directly give all/other 3rd party apps access to run termux commands.
  • termux includes a document provider allowing to access the private storage
  • sdcard/Android/media (both internal and external SD cards) is accessible via ~/storage after running termux-setup-storage. This directory is also read/write on Android 12/13 (not sure about later versions, this may also be affected by selinux policies that vary based on what OS the app was originally installed under, not the current OS version). If this is still true on later Android versions, you should be able to directly move files from there without copying them first if the user prefers to keep them in a root-level Music directory.

[LossyDragon]

JavaSteam maintainer here. I am working on a new version of our downloader which is way more aligned to SteamKit's depot downloader internals, progress here. I haven't dealt with music on steam so I'm not sure what all it would take to support it, but maybe that would be something fairly simple to implement if it's just a depot/pubfile/ugcitem. :D

(Also if you ever need a tester for playstore in the future, I'd help)

[Efreak]

I haven't dealt with music on steam so I'm not sure what all it would take to support it, but maybe that would be something fairly simple to implement if it's just a depot/pubfile/ugcitem.

Not sure about the details of downloading, but if you do implement it, note that Steam doesn't use the metadata (it's frequently missing, but the music player in Steam still has it correctly), so there should be some other way of getting whatever Steam displays.

And as far as implementing an app, it would be very nice if there was a downloader that set the metadata to whatever Steam has, as this data is unselectable and can't actually be copied from Steam. Usually track names are in filenames or metadata, but the format isn't standardized and I've had to copy titles from the browser before. (For one album I added in a last-minute hurry, I had to leave track numbers out as they weren't in alphabetic order in Steam and had no tags or track numbers in filenames). See https://steamsoundtracks.com

• This is just a note, not a specific request to either of you, I highly doubt it's accessible via steamcmd or depot downloader