Android: Work around an android bug.

BitmapFactory.decodeFile() fails when called outside the main thread.
Work around by running the code on the main thread. This also has the advantage
of off-loading from the Rockbox thread which should improve track skipping
delays.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30825 a1c6a512-1295-4272-9138-f99709370657
1 file changed