code: private void loadArtwork(final Context context, final String artworkUrl) {
          mMainThreadHandler.post(new Runnable() {
              @Override
              public void run() {
                  final Picasso picasso = Picasso.with(context);
                  picasso.cancelRequest(mMediaSessionArtworkTarget);
                  picasso.load(artworkUrl)
                          .centerCrop()
                          .resize(MEDIA_SESSION_ARTWORK_SIZE, MEDIA_SESSION_ARTWORK_SIZE)
                          .into(mMediaSessionArtworkTarget);
              }
          });
      }
docs: Load the track artwork.
  
  @param context    context used by {@link com.squareup.picasso.Picasso} to load the artwork asynchronously.
  @param artworkUrl artwork url of the track.