[Android] Extract audio focus mgmt from PlaybackService

[Geoffrey Métais]

vlc-android | branch: master | Geoffrey Métais <geoffrey.metais at gmail.com> | Mon Apr 16 14:59:22 2018 +0200| [0aa76951c799e5b37b41e780e70eabfb03514683] | committer: Geoffrey Métais

Extract audio focus mgmt from PlaybackService

> https://code.videolan.org/videolan/vlc-android/commit/0aa76951c799e5b37b41e780e70eabfb03514683
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 .../src/org/videolan/vlc/PlaybackService.kt        | 117 +-----------------
 .../org/videolan/vlc/util/VLCAudioFocusHelper.kt   | 133 +++++++++++++++++++++
 2 files changed, 139 insertions(+), 111 deletions(-)

Diff:   https://code.videolan.org/videolan/vlc-android/commit/0aa76951c799e5b37b41e780e70eabfb03514683