android - 使用 PageRow 的 leanback BrowseFragment 的自定义 header

Question

该代码由一个 BrowseFragment 组成，该 BrowseFragment 具有与每个标题行关联的多个列表行，引用此代码，我能够使用 PageRow 而不是 ListRow 正确实现它( https://github.com/googlesamples/leanback-showcase/blob/master/app/src/main/java/android/support/v17/leanback/supportleanbackshowcase/app/page/PageAndListRowFragment.java )

问题出在这个帮助我自定义标题的函数(向标题添加图标:

browseFragment.setHeaderPresenterSelector(new PresenterSelector() {
        @Override
        public IconHeaderPresenter getPresenter(Object item) {
            return new IconHeaderPresenter();
        }

    });

添加后，标题不再被选中，我无法在它们之间导航。

这就是我创建浏览 fragment 的方式:

    ...     
    browseFragment = new BrowseFragment();
    browseFragment.setHeadersState(BrowseFragment.HEADERS_ENABLED);
    browseFragment.prepareEntranceTransition();
    browseFragment.setHeaderPresenterSelector(new PresenterSelector() {
        @Override
        public IconHeaderPresenter getPresenter(Object item) {
            return new IconHeaderPresenter();
        }

    });

    mBackgroundManager = BackgroundManager.getInstance(shared.main);
    mBackgroundManager.attach(shared.main.getWindow());
    browseFragment.getMainFragmentRegistry().registerFragment(IconPageRow.class,
            new PageRowFragmentFactory(mBackgroundManager));

...

private static class PageRowFragmentFactory extends BrowseFragment.FragmentFactory {
    private final BackgroundManager mBackgroundManager;

    PageRowFragmentFactory(BackgroundManager backgroundManager) {
        this.mBackgroundManager = backgroundManager;
    }

    @Override
    public Fragment createFragment(Object rowObj) {
        ArrayObjectAdapter adapter=((IconPageRow)rowObj).getAdapter();
        RowsFragment rowsFragment = new RowsFragment();
        rowsFragment.enableRowScaling(true);
        rowsFragment.setAdapter(adapter);
        mBackgroundManager.setDrawable(null);
        rowsFragment.setOnItemViewClickedListener(browseClickListener);
        rowsFragment.setOnItemViewSelectedListener(browseSelectedListener);
        return rowsFragment;
    }
}

Answer 1

解决方案是在 onCreateViewHolder 中向我的自定义 header 演示器 (IconHeaderPresenter) 添加以下两行:

view.setFocusable(true);
view.setFocusableInTouchMode(true);