RecyclerView 嵌套 ViewHolder 子视图

Question

当我尝试循环添加更多子视图到父视图时，我遇到了 RecyclerView 问题。当我滚动时，它会出现一秒钟的空白。是来自数据绑定还是视图渲染？

这是我的代码：

public class TournamentFixtureAdapter extends LoadMoreRecyclerViewAdapter<FixtureGroup> {
    private OnFixtureClickListener onFixtureClickListener = null;

    public TournamentFixtureAdapter(List<FixtureGroup> data) {
        super(data);
    }

    @Override
    protected RecyclerView.ViewHolder onCreateContentItemViewHolder(ViewGroup parent, int contentViewType) {
        return new TournamentFixtureHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item_tournament_fixture, parent, false));
    }

    @Override
    protected void onBindContentItemViewHolder(RecyclerView.ViewHolder holder, int position) {
        super.onBindContentItemViewHolder(holder, position);
        FixtureGroup fixtureGroup = data.get(position);
        ((TournamentFixtureHolder) holder).onFixtureClickListener = onFixtureClickListener;
        ((TournamentFixtureHolder) holder).parentPos = position;
        ((TournamentFixtureHolder) holder).binding.setFixtureGroup(fixtureGroup);
        ((TournamentFixtureHolder) holder).addFixtures(fixtureGroup.getFixtures());
    }

    public void setOnFixtureClickListener(OnFixtureClickListener onFixtureClickListener) {
        this.onFixtureClickListener = onFixtureClickListener;
    }

    static class TournamentFixtureHolder extends FixtureHolder {
        ListItemTournamentFixtureBinding binding = null;

        public TournamentFixtureHolder(View itemView) {
            super(itemView);
            binding = DataBindingUtil.bind(itemView);
        }
    }
}

public class FixtureHolder extends BaseAdapter.BaseHolder {
    LinearLayout           layoutMain             = null;
    OnFixtureClickListener onFixtureClickListener = null;
    int parentPos;

    public FixtureHolder(View itemView) {
        super(itemView);
        layoutMain = (LinearLayout) itemView.findViewById(R.id.layout_main);
        setIsRecyclable(layoutMain.getChildCount() > 0);
    }

    public void addFixtures(final ArrayList<Fixture> fixtures) {

        for (final Fixture fixture : fixtures) {
            LinearLayout parent = (LinearLayout) LayoutInflater.from(itemView.getContext()).inflate(R.layout.view_fixture, null);

            Utils.getDefaultClubLogo((NetworkImageViewPlus) parent.findViewById(R.id.netview_home_img)).setImageUrl(fixture.getHome().getImg(), AppController.getInstance().getImageLoader());
            Utils.getDefaultClubLogo((NetworkImageViewPlus) parent.findViewById(R.id.netview_away_img)).setImageUrl(fixture.getAway().getImg(), AppController.getInstance().getImageLoader());
            ViewFixtureBinding binding = DataBindingUtil.bind(parent);

            layoutMain.addView(parent);
            binding.setFixture(fixture);

            parent.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    onFixtureClickListener.onFixtureClick(parentPos, findFixturePosById(fixtures, fixture.getId()));
                }
            });
        }
    }

    private int findFixturePosById(ArrayList<Fixture> fixtures, int id) {
        for (int i = 0; i < fixtures.size(); i++) {
            if (fixtures.get(i).getId() == id) {
                return i;
            }
        }
        return 0;
    }
}

Answer 1

如果问题更多出在数据端（适配器），那么它可能会出现在正常布局上，而不仅仅是在滚动期间。例如，如果您从慢速服务器加载图像，则初始显示会很慢。由于它仅在您滚动时发生，这更多地表明布局管理器存在问题。

对于每个新视图，您必须从适配器中获取它，并将其添加到布局中。如果您在水平/垂直滚动中允许最大 dx，并且缓存了屏幕显示之外的回收视图，那么在布局管理器从适配器获取新视图并将其布局之前，内容可能会显示为空白。

因此有两个因素 - 水平和/或垂直 dx 太大、太快，以及回收（或废弃）视图的数量太少。因此，解决方案是减慢滚动速度，或者增加您在屏幕外添加的视图数量。