[Android] Asynchronously compute lists headers

[Geoffrey Métais]

vlc-android | branch: master | Geoffrey Métais <geoffrey.metais at gmail.com> | Tue Apr 28 10:50:31 2020 +0200| [8f25dcfb727ed453701c1961ef0e7439e9b0d71d] | committer: Geoffrey Métais

Asynchronously compute lists headers

Allows to load lists faster, but UI has to be ready to load headers
later

> https://code.videolan.org/videolan/vlc-android/commit/8f25dcfb727ed453701c1961ef0e7439e9b0d71d
---

 .../src/org/videolan/vlc/providers/medialibrary/AlbumsProvider.kt   | 5 ++++-
 .../src/org/videolan/vlc/providers/medialibrary/ArtistsProvider.kt  | 5 ++++-
 .../src/org/videolan/vlc/providers/medialibrary/FoldersProvider.kt  | 6 ++++--
 .../src/org/videolan/vlc/providers/medialibrary/GenresProvider.kt   | 5 ++++-
 .../org/videolan/vlc/providers/medialibrary/PlaylistsProvider.kt    | 5 ++++-
 .../src/org/videolan/vlc/providers/medialibrary/TracksProvider.kt   | 5 ++++-
 .../org/videolan/vlc/providers/medialibrary/VideoGroupsProvider.kt  | 4 +++-
 .../src/org/videolan/vlc/providers/medialibrary/VideosProvider.kt   | 5 ++++-
 8 files changed, 31 insertions(+), 9 deletions(-)

Diff:   https://code.videolan.org/videolan/vlc-android/commit/8f25dcfb727ed453701c1961ef0e7439e9b0d71d