RecyclerView监听y坐标位置

RecyclerView本身没有提供监听y坐标位置的方法，但可以通过以下几种方式实现：

1. 在RecyclerView中重写onTouchEvent方法，获取手指触摸的位置，并通过计算得到对应的item位置。例如：

@Override
public boolean onTouchEvent(MotionEvent e) {
    int action = e.getAction();
    switch (action) {
        case MotionEvent.ACTION_DOWN:
            int x = (int) e.getX();
            int y = (int) e.getY();
            View childView = findChildViewUnder(x, y);
            if (childView != null) {
                int position = getChildAdapterPosition(childView);
                //根据position做相应处理
            }
            break;
    }
    return super.onTouchEvent(e);
}

2. 在RecyclerView的LayoutManager中重写onLayoutChildren方法，在布局item时获取其y坐标位置。例如：

@Override
public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {
    super.onLayoutChildren(recycler, state);
    for (int i = 0; i < getItemCount(); i++) {
        View childView = recycler.getViewForPosition(i);
        measureChildWithMargins(childView, 0, 0);
        int left = getPaddingLeft();
        int top = getPaddingTop() + getDecoratedMeasuredHeight(childView) * i;
        int right = left + getDecoratedMeasuredWidth(childView);
        int bottom = top + getDecoratedMeasuredHeight(childView);
        layoutDecorated(childView, left, top, right, bottom);
        //获取item的y坐标位置top，做相应处理
    }
}

3. 使用RecyclerView的addOnScrollListener方法监听滚动事件，在滚动时获取当前可见的item位置。例如：

mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);
        LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
        int firstVisibleItemPosition = layoutManager.findFirstVisibleItemPosition();
        int lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition();
        //根据firstVisibleItemPosition和lastVisibleItemPosition做相应处理
    }
});