Migrate to the SplashScreen API

[abelgardep]

With Android 12, a new Splash Screen API was introduced. We should migrate it from the custom to the new API to ensure that it displays correctly starting in Android 12

TASKS

• [x] Research (if needed)
• [x] Create branch feature/migrate_splash_screen
• [x] Development tasks
  • [x] Implement new API
  • [x] Add compatibility with older Android versions
• [x] Code review and apply changes requested
• [x] Design test plan
• [x] QA
• [ ] Merge branch feature/migrate_splash_screen into master

PR

• App: #3421

[jesmrec]

To check if helps to fix https://github.com/owncloud/enterprise/issues/4727

[nathanmkaya]

@jesmrec @abelgardep @fesave could I pick this up?

[jesmrec]

@nathanmkaya we have already started to work on this, so, in order to avoid duplicated PRs, i suggest you to use the "Contributions are welcome" label to filter issues that are interesting to contribute. Also, if you have in mind any issue or new feature, it is welcome as new issue as well.

Thanks a lot for your engagement!

[fesave]

With the new home screen API for Android 12 devices, I tried to reproduce the owncloud/enterprise#4727 as you can see in the video and it was impossible, I think we are on the right way to fix it.

cc @michaelstingl

https://user-images.githubusercontent.com/49989790/138896471-9dd57702-5152-4490-8d1d-3addcd9ab651.mov

[michaelstingl]

I think we are on the right way to fix it.

Glad to hear 👍

[michaelstingl]

Check again with the final version?