Android TV androidx.leanback:leanback 开箱体验

public class HomeFragment extends BrowseSupportFragment {
    private static final int GRID_ITEM_WIDTH = 200;
    private static final int GRID_ITEM_HEIGHT = 200;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

//        setHeadersState(HEADERS_DISABLED);

        String[] headerItem = new String[] {"P1", "P2", "P3", "P5", "P6", "P7", "P8", "P9"};
        int coverItemCount = 20;
        ArrayObjectAdapter rowsAdapter = new ArrayObjectAdapter(new ListRowPresenter());
        for (String item : headerItem) {
            HeaderItem gridHeader = new HeaderItem( item);
            GridItemPresenter mGridPresenter = new GridItemPresenter();
            ArrayObjectAdapter gridRowAdapter = new ArrayObjectAdapter(mGridPresenter);

            int idx = 0;
            while (idx < coverItemCount) {
                String title = item + "-" + idx;
                gridRowAdapter.add(title);
                idx = idx + 1;
            }

            rowsAdapter.add(new ListRow(gridHeader, gridRowAdapter));
        }

        setAdapter(rowsAdapter);
    }

    private class GridItemPresenter extends Presenter {
        @Override
        public ViewHolder onCreateViewHolder(ViewGroup parent) {
            TextView view = new TextView(parent.getContext());
            view.setLayoutParams(new ViewGroup.LayoutParams(GRID_ITEM_WIDTH, GRID_ITEM_HEIGHT));
            view.setFocusable(true);
            view.setFocusableInTouchMode(true);
            view.setBackgroundColor(
                    ContextCompat.getColor(getActivity(), android.R.color.holo_red_light));
            view.setTextColor(Color.WHITE);
            view.setGravity(Gravity.CENTER);
            return new ViewHolder(view);
        }

        @Override
        public void onBindViewHolder(ViewHolder viewHolder, Object item) {
            ((TextView) viewHolder.view).setText((String) item);
        }

        @Override
        public void onUnbindViewHolder(ViewHolder viewHolder) {
        }
    }
}