android - 如何始终在 RowsFragment 中显示标题

Question

我正在尝试创建一个类似于 Youtube 应用程序的 Android 电视应用程序。我正在使用 Sofa库来做到这一点。现在，当我试图显示 RowsFragment 中各个项目的 header 时，即使 RowsFragment 没有焦点，问题也来了。以下是将数据集加载到 browseFragment 的代码

private void loadRowsCustom() {
        adapter = new ArrayObjectAdapter();

        int split = 3;
        int rowsFragmentCount = videoList.size() / split + (videoList.size() % split != 0 ? 1 : 0);

        for (int i = 0; i < rowsFragmentCount; i++) {

            ListRowPresenter lrp = new ListRowPresenter(FocusHighlight.ZOOM_FACTOR_LARGE);
            ArrayObjectAdapter rowsAdapter = new ArrayObjectAdapter(lrp);

            String category = "Category";

            for (int j = 0; j < split && (i * split + j) < videoList.size(); j++) {
                Video[] videos = videoList.get(i * split + j);
                ArrayObjectAdapter rowCollAdapter = new ArrayObjectAdapter(new VideoPresenter());
                rowCollAdapter.addAll(0, Arrays.asList(videos));
                ListRow row = new ListRow(new HeaderItem(videos[0].category),rowCollAdapter);
                rowsAdapter.add(row);
                category = videos[0].category;
            }

            ArrayObjectAdapter fragmentAdapter = new ArrayObjectAdapter();
            RowsSupportFragment rowsSupportFragment = new RowsSupportFragment();
            rowsSupportFragment.setAdapter(rowsAdapter);
            rowsSupportFragment.enableRowScaling(false);
            fragmentAdapter.add(rowsSupportFragment);
            adapter.add(new ListRow(new HeaderItem(category), fragmentAdapter));
        }

        browseSupportFragment.setAdapter(adapter);
        browseSupportFragment.setHeadersState(BrowseSupportFragment.HEADERS_ENABLED);
        browseSupportFragment.setOnSearchClickedListener(searchClickListener);
        browseSupportFragment.setOnItemViewClickedListener(browseClickListener);
        browseSupportFragment.setTitle("Google Videos");
    }

所需的和当前的实现在下面的屏幕截图中进行了描述:

Answer 1

正如 Mayur Kaul 已经提到的，你只需要打电话

mRowsFragment.setExpand(true)

但在这种情况下，每次 onAttachedToWindow(...) 方法都会被调用(参见 android.support.v17.leanback.app.RowsFragment - ItemBridgeAdapter.AdapterListener mBridgeAdapterListener)，你的标题标题无论如何都会被隐藏。

所以最终的解决方案，女巫对我有用它只是简单地重写 RowsFragment 实现中的 setExpand() 方法，如下所示:

@Override
    public void setExpand(boolean expand) {
        super.setExpand(true);
    }