[Android] Use an object pool for image fetcher

[Geoffrey Métais]

vlc-android | branch: master | Geoffrey Métais <geoffrey.metais at gmail.com> | Tue Dec 26 14:24:21 2017 +0100| [99faad420d0536a17b8196736b3bbce1bf9095fd] | committer: Geoffrey Métais

Use an object pool for image fetcher

> https://code.videolan.org/videolan/vlc-android/commit/99faad420d0536a17b8196736b3bbce1bf9095fd
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 .../videolan/vlc/gui/helpers/AsyncImageLoader.java |  78 +++++++------
 .../org/videolan/vlc/gui/helpers/BitmapCache.java  |   1 -
 .../src/org/videolan/vlc/gui/tv/CardPresenter.java | 121 +++++++--------------
 .../src/org/videolan/vlc/util/HttpImageLoader.java |  66 +----------
 4 files changed, 93 insertions(+), 173 deletions(-)

Diff:   https://code.videolan.org/videolan/vlc-android/commit/99faad420d0536a17b8196736b3bbce1bf9095fd