Android : Weird bug with ActionBar - PullToRefresh

I'm using the common ActionBar - PullToRefresh library. The functionality works perfectly, but I have a customization where I edit some text, the progress bar color and the background color of the PullToRefresh.

In my fragment, all of this is achieved as such:

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    ViewGroup viewGroup = (ViewGroup) view;
    mPullToRefreshLayout = new PullToRefreshLayout(viewGroup.getContext());

    ActionBarPullToRefresh.from(getActivity())
            .insertLayoutInto(viewGroup)
            .theseChildrenArePullable(getListView(), getListView().getEmptyView())
            .listener(this)
            .setup(mPullToRefreshLayout);

    DefaultHeaderTransformer transformer = (DefaultHeaderTransformer) mPullToRefreshLayout
            .getHeaderTransformer();
    transformer.getHeaderView().findViewById(R.id.ptr_text)
            .setBackgroundColor(getResources().getColor(R.color.black));
    transformer.setProgressBarColor(getResources().getColor(R.color.blue));
    transformer.setPullText("Pull down the internet...");
    transformer.setRefreshingText("Finding posts...");

}

When you first use the app, everything looks perfect, but for some reason the background color, where in the code I did transformer.getHeaderView().findViewById(R.id.ptr_text).setBackgroundColor(getResources().getColor(R.color.black));, reverts back to what it is by default.

I have no idea why this is the case. I usually notice this after I haven't used the app in a while and I go back in and try to refresh something. I haven't pinned down any type of activity or action that causes it.

My best guess would be that sometimes, the HeaderView, which I get from the transformer via getHeaderView() hasn't been inflated yet. I thought it might have to do with the life cycle of the onViewCreated(View, Bundle) method in Fragments, but then the other customizations I did would also not work.

Is this a bug in the library? Am I not setting the background color properly?