Themes: Expose hard coded background in java

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<resources>

    <color name="pad_view_pager_background">#ff000000</color>

</resources>

        super(context, attrs);

        setAdapter(mStaticPagerAdapter);

        setBackgroundColor(Color.BLACK);

        setBackgroundColor(context.getColor(R.color.pad_view_pager_background));

        setPageMargin(getResources().getDimensionPixelSize(R.dimen.pad_page_margin));

        setPageTransformer(false, mPageTransformer);

        addOnPageChangeListener(mOnPageChangeListener);