Provide mime type to file picker to gray out unselectable files

[Stypox]

What is it?

• Bugfix (user facing)
• Feature (user facing)
• Codebase improvement (dev facing)
• Meta improvement to the project (dev facing)

Description of the changes in your PR

This PR just adds a mime type to all getPicker calls. When using SAF now, each time the app will want to open a file (to import the database or subscriptions), all files with the incorrect file format will be grayed out. So the database import picker will only let .zip be selected and the subscription import picker will only let .json be selected. The service-specific subscription imports, though, still have */* as mime type as the extension of those files could be subject to change and is different between services.

Before/After Screenshots/Screen Record

Before	After

Fixes the following issue(s)

• Partially fixes Requesting changes to exporting database #1493
• Fixes problems with people mixing up the database zip and the subscriptions json

APK testing

The APK can be found by going to the "Checks" tab below the title. On the left pane, click on "CI", scroll down to "artifacts" and click "app" to download the zip file which contains the debug APK of this PR. @opusforlife2

Due diligence

• I read the contribution guidelines.

[opusforlife2]

Werks. 🎉

Damn that is so much more convenient.

[Stypox]

@TobiGr this should also be safe to merge :-)

[TobiGr]

Oh yes, I reviewed this but forgot to approve it...

[NilsIrl]

For some reason this doesn't work for me, I'm on 0.21.13 and all the files are greyed out including the json file containing an export of my subscriptions.

[NilsIrl]

For some reason, by converting the file to *.json (1) instead of *.json makes it become selectable.

[NilsIrl]

Importing one's settings from a zip file works though.

[NilsIrl]

According to this: the problem is that android doesn't support the json mime type: https://stackoverflow.com/a/58104204/11748992

And looking at the latest android source code it seems it still doesn't support it now.

[triallax]

For some reason, by converting the file to *.json (1) instead of *.json makes it become selectable.

I think that's expected?

[NilsIrl]

? To be clear *.json (1) WORKS

*.json DOESN'T WORK

The file is just not selectable, the fact there's this workaround, is irrelevant. I only mentioned it as I was trying to understand what was going on. Now we know the reason it doesn't work: Android doesn't support the JSON MIME type.

[triallax]

Ah, yeah, I misread your comment.

[NilsIrl]

Created a separate issue for it: #7326