[Feature Request] Other Format Support & Directory Listing about pdfviewer HOT 3 CLOSED

I've filed GrapheneOS/os-issue-tracker#381 to track the creation of an epub viewer based on this app. It's going to need to wait until after planned overhauls of this app and we'll need to find someone interested in working on it. I need to reach out to the person who was helping me with this app to see if they're still interested in working on it. Once progress is made, maybe they'd be interested in working on that too. Also possible we can find other people interested in working on this.

I don't think we want to make any kind of file manager interface in the app though, and I don't see a better way of delegating to the system file management UI than what we're already doing.

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My second request was to have a directory view on launch, or basically a favorited directory where you can see all your books in that directory. Would be easier than browsing all the way to the directory each time. However I'm unsure if this was avoided purposely for a security reason, which would be understandable. But if possible, it would be nice.

We have to use the system UI to access files in the profile's home directory since we don't use the deprecated Storage permission. It would be possible to request persistent access to a directory from the user via the system UI, but we don't really want to make our own file access interface based on that.

I'd suggest opening the directory in the OS Files app and browsing there, and opening them from there in the PDF Viewer app.

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This could be done with something like https://github.com/futurepress/epub.js/ but it probably makes more sense as a separate app with a partially shared codebase. It would be a lot more difficult to maintain it as one app. We're already struggling to find the development resources to maintain and improve this app due to being more focused on many other things. Ideally, we could find someone heavily interested in working on this and also in making a separate epub app based on it.

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