[Android] Thread showNotification and meta update

[Geoffrey Métais]

vlc-android | branch: master | Geoffrey Métais <geoffrey.metais at gmail.com> | Fri Jun 16 15:28:39 2017 +0200| [7453a205215c9af0cf1ada0368a1e4e92ab4cb4f] | committer: Geoffrey Métais

Thread showNotification and meta update

This is due to cover image loading, we could do I/O and even netwxork on
main thread

> https://code.videolan.org/videolan/vlc-android/commit/7453a205215c9af0cf1ada0368a1e4e92ab4cb4f
---

 .../src/org/videolan/vlc/PlaybackService.java      | 226 ++++++++++++---------
 1 file changed, 133 insertions(+), 93 deletions(-)

Diff:   https://code.videolan.org/videolan/vlc-android/commit/7453a205215c9af0cf1ada0368a1e4e92ab4cb4f