[Android] Browser: use Flow API to fetch files

[Geoffrey Métais]

vlc-android | branch: 3.2.x | Geoffrey Métais <geoffrey.metais at gmail.com> | Mon Sep  9 17:48:45 2019 +0200| [a46b591a00acb29395e79d8992e0108372fa7754] | committer: Geoffrey Métais

Browser: use Flow API to fetch files

(cherry picked from commit 478562826b140a0f07b6297dacdc89957f7f9f1c)

> https://code.videolan.org/videolan/vlc-android/commit/a46b591a00acb29395e79d8992e0108372fa7754
---

 .../org/videolan/vlc/providers/BrowserProvider.kt  | 70 ++++++++++------------
 .../videolan/vlc/providers/FileBrowserProvider.kt  | 13 +++-
 .../videolan/vlc/providers/FilePickerProvider.kt   |  9 ++-
 .../org/videolan/vlc/providers/NetworkProvider.kt  | 11 ++--
 .../org/videolan/vlc/providers/StorageProvider.kt  |  2 +-
 5 files changed, 50 insertions(+), 55 deletions(-)

Diff:   https://code.videolan.org/videolan/vlc-android/commit/a46b591a00acb29395e79d8992e0108372fa7754