自定义ItemDecoration类未在最后一项上绘制分隔符

public class CustomItemDecoration extends RecyclerView.ItemDecoration {
    private Drawable divider;

    public CustomItemDecoration(Context context) {
        // 初始化分隔符Drawable
        divider = ContextCompat.getDrawable(context, R.drawable.divider);
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        int itemCount = parent.getAdapter().getItemCount();
        int lastItemPosition = itemCount - 1;

        for (int i = 0; i < itemCount; i++) {
            // 判断是否为最后一项
            if (i != lastItemPosition) {
                // 绘制分隔符
                drawDivider(c, parent, i);
            }
        }
    }

    private void drawDivider(Canvas canvas, RecyclerView parent, int position) {
        int left = parent.getPaddingLeft();
        int right = parent.getWidth() - parent.getPaddingRight();
        View child = parent.getChildAt(position);
        RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();
        int top = child.getBottom() + params.bottomMargin;
        int bottom = top + divider.getIntrinsicHeight();
        divider.setBounds(left, top, right, bottom);
        divider.draw(canvas);
    }
}