LeanbackShowcase/app/src/main/java/androidx/leanback/leanbackshowcase/app/details/DetailViewExampleFragment.java [191:199]:
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    public void onItemSelected(Presenter.ViewHolder itemViewHolder, Object item,
                               RowPresenter.ViewHolder rowViewHolder, Row row) {
        if (mRowsAdapter.indexOf(row) > 0) {
            int backgroundColor = getResources().getColor(R.color.detail_view_related_background);
            getView().setBackgroundColor(backgroundColor);
        } else {
            getView().setBackground(null);
        }
    }
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LeanbackShowcase/app/src/main/java/androidx/leanback/leanbackshowcase/app/details/DetailViewExampleWithVideoBackgroundFragment.java [247:255]:
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    public void onItemSelected(Presenter.ViewHolder itemViewHolder, Object item,
                               RowPresenter.ViewHolder rowViewHolder, Row row) {
        if (mRowsAdapter.indexOf(row) > 0) {
            int backgroundColor = getResources().getColor(R.color.detail_view_related_background);
            getView().setBackgroundColor(backgroundColor);
        } else {
            getView().setBackground(null);
        }
    }
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