How to make always visible headers of rows in RowsFragment

Question

Here is what i have now.

Simply my RowsFragment is look like this,

public static class SampleFragmentB extends RowsFragment {
        private final ArrayObjectAdapter mRowsAdapter;

        public SampleFragmentB() {
            mRowsAdapter = new ArrayObjectAdapter(new ShadowRowPresenterSelector());

            setAdapter(mRowsAdapter);
            setOnItemViewClickedListener(new OnItemViewClickedListener() {
                @Override
                public void onItemClicked(
                        Presenter.ViewHolder itemViewHolder,
                        Object item,
                        RowPresenter.ViewHolder rowViewHolder,
                        Row row) {
                    Toast.makeText(getActivity(), "Implement click handler", Toast.LENGTH_SHORT)
                            .show();
                }
            });
        }

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            createRows();
            getMainFragmentAdapter().getFragmentHost().notifyDataReady(getMainFragmentAdapter());
        }

        private void createRows() {
                String json = Utils.inputStreamToString(getResources().openRawResource(
                        R.raw.page_row_example));
                CardRow[] rows = new Gson().fromJson(json, CardRow[].class);
                for (CardRow row : rows) {
                    mRowsAdapter.add(createCardRow(row));
                }
        }

        private Row createCardRow(CardRow cardRow) {
            PresenterSelector presenterSelector = new CardPresenterSelector(getActivity());
            ArrayObjectAdapter adapter = new ArrayObjectAdapter(presenterSelector);
            for (Card card : cardRow.getCards()) {
                adapter.add(card);
            }

            HeaderItem headerItem = new HeaderItem(cardRow.getTitle());
            return new CardListRow(headerItem, adapter, cardRow);
        }
    }

This is what i exactly want to do,

So I want to make always visible Header of each row without selecting into or focusing into RowsFragment. I'am using leanback v24 to add multiple rows into each header item.

Answer 1

You might want to check the Sofa library for Android TV that extends the Leanback library capabilities by offering a set of more powerful features. In BrowseSupportFragment, mRowsFragment.setExpand should be true. Additional reference: how to always show headers in RowsFragment