recyclerview套用，记录滑动位置

a1466850214

已于 2023-02-02 17:53:48 修改

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文章标签： android 安卓 android studio

于 2023-02-02 17:49:30 首次发布

本文链接：https://blog.youkuaiyun.com/a1466850214/article/details/128854659

文章讲述了在Android开发中遇到的一个常见问题，即在竖向RecyclerView中嵌套横向RecyclerView时，点击横向RecyclerView的单元格更新数据会导致滚动位置混乱。为了解决这个问题，作者提出了一个自定义的RecyclerView实现，包括记录滚动位置和偏移量，并在数据更新后恢复滚动状态。此外，还创建了一个监听接口来处理单元格变化和滚动变化事件。

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开发中常用到竖向 recyclerview中套用横向的recyclerview的情况，这时候点击横向recyclerview的cell更新数据时候会出现横向recyclerview乱动的情况

在list 中记录位置

 public static class SelfModel {
        private int lastPosition = 0;
        private int lastOffset = 0;
    }

自定义recyclerview

public class StepSizeView extends RecyclerView {

    private List<String> datas = new ArrayList<>();
    private StepSizeAdapter adapter;
    private Listener.CheckChangeWithPositionListener checkChangeListener;
    private LayoutManager layoutManager;


    public StepSizeView(@NonNull Context context) {
        super(context);
        init();
    }

    public StepSizeView(@NonNull Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public StepSizeView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        try {
            layoutManager = LayoutManagers.linear(LinearLayoutManager.HORIZONTAL, false).create(this);
            setLayoutManager(layoutManager);
            adapter = new StepSizeAdapter();
            setAdapter(adapter);
            addOnScrollListener(new RecyclerView.OnScrollListener() {
                @Override
                public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
                    super.onScrollStateChanged(recyclerView, newState);
                    View topView = layoutManager.getChildAt(0);
                    int lastOffset = topView.getLeft();
                    int lastPosition = layoutManager.getPosition(topView);
                    if (checkChangeListener != null)
                        checkChangeListener.onScrollChange(lastPosition,lastOffset);
                }
            });
        } catch (Exception e) {

        }
    }

    public void setDatas(List<StepSize> mdatas, int lastPosition, int lastOffset) {
        datas.clear();
        if (mdatas != null)
            datas.addAll(mdatas);
        adapter.notifyDataSetChanged();// 在列表数据加完完成后，执行此方法，对数据进行操作
        getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                post(() -> {
                    ((LinearLayoutManager) layoutManager).scrollToPositionWithOffset(lastPosition, lastOffset);
                });
                getViewTreeObserver().removeOnGlobalLayoutListener(this);
            }
        });
    }

    class StepSizeAdapter extends RecyclerView.Adapter {

        @NonNull
        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            return new ViewHoler(LayoutInflater.from(parent.getContext()).inflate(R.layout.view_step_size, null));
        }

        @Override
        public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
            ViewHoler vh = (ViewHoler) holder;
            vh.setData(position);
        }

        @Override
        public int getItemCount() {
            return datas.size();
        }
    }

    class ViewHoler extends RecyclerView.ViewHolder {

        public ViewHoler(View root) {
            super(root);
        }

        public void setData(int position) {
            xxxx.setOnClickListener(view -> {
                if (checkChangeListener != null)
                    checkChangeListener.onChange(position);
            });
        }
    }

    public void setCheckChangeWithPositionListener(Listener.CheckChangeWithPositionListener checkChangeListener) {
        this.checkChangeListener = checkChangeListener;
    }

}

监听方法

public class Listener {
    public interface CheckChangeWithPositionListener {//选项变化监听

        void onChange(int position);
        void onScrollChange(int lastPosition,int lastOffset);
    }
}

然后在竖向recyclerview viewholder中更新数据

 class ViewHoler extends RecyclerView.ViewHolder {
        private StepSizeView stepSizeView;

        public ViewHoler(View root) {
            super(root);
            stepSizeView = root.findViewById(R.id.stepSizeView);
        }

        public void setData(int position) {
            stepSizeView.setDatas(datas.get(position).stepSizeList, datas.get(position).lastPosition, datas.get(position).lastOffset);
                stepSizeView.setCheckChangeWithPositionListener(new Listener.CheckChangeWithPositionListener() {
                    @Override
                    public void onChange(int cellPosition) {
                        //更新数据
                    }

                    @Override
                    public void onScrollChange(int lastPosition, int lastOffset) {
                        datas.get(position).lastPosition = lastPosition;
                        datas.get(position).lastOffset = lastOffset;
                    }
                });
        }
    }