new media view stalls the UI when launched

[svenb1234]

Steps to reproduce

1. Go to the hamburger menu
2. Open the media view

Expected behaviour

• pictures should be visible instantly, at least those on the device, better at least all that are already known to the client since they have been loaded before
• "gathering pictures" or similar should be shown if pictures cannot be shown instantly, e.g. first start-up and no local pictures.

Actual behaviour

• The UI stalls for more than 15 seconds

Environment data

Android version: 12

Device model: Pixel 4a

Stock or customized system: stock

Nextcloud app version: 3.20

Nextcloud server version: 23.0.4

Reverse proxy: apache

Logs

Web server error log

Insert your webserver log here

Nextcloud log (data/nextcloud.log)

Insert your Nextcloud log here

NOTE: Be super sure to remove sensitive data like passwords, note that everybody can look here! You can use the Issue Template application to prefill some of the required information: https://apps.nextcloud.com/apps/issuetemplate

[aaronjlawson]

Confirmed same behavior with Pixel 5, NC v24

[anarsoul]

Same here on Pixel 6, Nextcloud v24

[AlvaroBrey]

Confirmed happening if a very large amount of pictures is available in the server

[szaimen]

Yes, can confirm that this happens when you have a lot of media files on your server (in my case around 120k).

Based on Alvaro this happens because all media files get loaded in this view currently:
https://github.com/nextcloud/android/blob/master/app/src/main/java/com/owncloud/android/ui/fragment/GalleryFragment.java#L198

So a fix would be to only load new "pages" of new photos (with fixed size) as we're scrolling down.

[AndyXheli]

Same issue Samsung S21+ G5 SM-G996U1. I have over 30G+ of Photos & Videos but when clicking on the Media tab view take a few seconds to load and when it loads it lags while browsing content and clicking on photos. The iOS team dose a really nice job at loading the files via the media tab. Is there a way to use their loading method ?

[joshtrichards]

Related and potentially duplicates: #10882 & #10499