Android leanback 库 ListRowPresenter 整行展开

Posted 2023-04-15

【中文标题】Android leanback 库 ListRowPresenter 整行展开

【英文标题】：Android leanback library ListRowPresenter whole row expand

【发布时间】：2015-05-20 01:46:23

【问题描述】：

我正在尝试在leanback library carousel中选择时使整行展开。

我想要的效果：

我正在处理 android TV 示例代码。 我试过setExpandedRowHeight(..);和setRowHeight(..);

/**
 * Created by sylversphere on 15-03-16.
 */
public class ExperimentalFragment extends BrowseFragment

    private ArrayObjectAdapter mRowsAdapter;
    private ExperimentalCardPresenter mCardPresenter;
    private int NUM_ROWS = 20;
    private int NUM_COLS = 40;
    private Context context;

    @Override
    public void onActivityCreated(Bundle savedInstanceState) 
        super.onActivityCreated(savedInstanceState);
        context = getActivity();
        setTitle("Hello there you kid"); // Badge, when set, takes precedent
        setHeadersState(HEADERS_DISABLED);
        loadRows();
    

    private void loadRows() 
        List<Movie> list = MovieList.setupMovies();

        final ListRowPresenter lrp = new ListRowPresenter(FocusHighlight.ZOOM_FACTOR_LARGE);
        lrp.setRowHeight(100);
        lrp.setExpandedRowHeight(200);

        mRowsAdapter = new ArrayObjectAdapter(lrp);

        mCardPresenter = new ExperimentalCardPresenter();

        int i;
        for (i = 0; i < NUM_ROWS; i++) 
            ArrayObjectAdapter listRowAdapter = new ArrayObjectAdapter(mCardPresenter);
            for (int j = 0; j < NUM_COLS; j++) 
                listRowAdapter.add(list.get(j % 5));
            
            mRowsAdapter.add(new ListRow(listRowAdapter));
        

        setAdapter(mRowsAdapter);
    

    private void say(String s) 
        Toast.makeText(context, "Say : "+s, Toast.LENGTH_SHORT).show();
    

但行保持不变。我尝试手动为行设置动画，但现在行之间没有适当的填充。 如何使行扩展并保持填充？

【参考方案1】：

通过使用 setExpandedRowHeight，您只是在设置高度，而不是真正扩展行。当您希望通过调用setRowViewExpanded 方法扩展行视图时，您需要显式设置行视图扩展

public final void setRowViewExpanded (Presenter.ViewHolder holder, boolean expanded)

【讨论】：

选择行时不会展开。相反，它会在选择 gridview（菜单项的子项）时展开行。