通过AdapterPosition获取RecyclerView的视图

Question

我有一个带有视频预览的RecyclerView.当用户滚动时,视频应自动在用户可见的recyclerView项目上播放(当滚动状态为IDLE时).

所以我编写了一个自定义的onScrollListener,它将用户可见的位置作为数组传递给方法startVideosOn(int[] positions).

但问题是当我想通过位置获取View时(位置等于适配器位置).当我尝试linearLayoutManager.getChildAt(index),我得到null显示第三项目时,因为RecyclerView只有2名儿童,将被回收.

那么如何View通过适配器位置设法获得RecyclerView？

编辑,这是OnScrollListener:

public abstract class AutoPlayRecyclerOnScrollListener extends RecyclerView.OnScrollListener {

    LinearLayoutManager linearLayoutManager;

    public AutoPlayRecyclerOnScrollListener(LinearLayoutManager linearLayoutManager) {
        this.linearLayoutManager = linearLayoutManager;
    }

    @Override
    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
        super.onScrollStateChanged(recyclerView, newState);

        if (newState == AbsListView.OnScrollListener.SCROLL_STATE_IDLE) {
            int firstVisibleItemPosition = linearLayoutManager.findFirstVisibleItemPosition();
            int lastVisibleItemPosition = linearLayoutManager.findLastVisibleItemPosition();

            if (firstVisibleItemPosition != -1 && lastVisibleItemPosition != -1) {
                playOn(firstVisibleItemPosition, lastVisibleItemPosition);
            }
        }
    }

    private void playOn(int lower, int upper) {
        int[] completelyVisibleItems = new int[upper - lower + 1];

        for (int i = lower, j = 0; i <= upper; i++, j++) {
            completelyVisibleItems[j] = i;
        }

        playOn(completelyVisibleItems);
    }

    public abstract void playOn(int[] items);
}

Answer 1

如果您需要获得任何View可见的"位置",请使用:

RecyclerView#findViewHolderForAdapterPosition(int position)

要么

RecyclerView#findViewHolderForLayoutPosition(int position)

返回的ViewHolder将保持View你想要的