Recyclerview项行背景色问题

@Override
public void onBindViewHolder(ViewHolder holder, int position) {
    // 根据位置设置背景色
    if (position % 2 == 0) {
        holder.itemView.setBackgroundColor(Color.WHITE);
    } else {
        holder.itemView.setBackgroundColor(Color.LIGHT_GRAY);
    }
    // 或者根据数据内容设置背景色
    if (dataList.get(position).isHighlighted()) {
        holder.itemView.setBackgroundColor(Color.YELLOW);
    } else {
        holder.itemView.setBackgroundColor(Color.WHITE);
    }
}

public class MyItemDecoration extends RecyclerView.ItemDecoration {
    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        // 设置项行之间的间距
        outRect.set(0, 0, 0, 10);
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            View child = parent.getChildAt(i);
            int position = parent.getChildAdapterPosition(child);
            // 根据位置或数据内容绘制项行的背景色
            if (position % 2 == 0) {
                child.setBackgroundColor(Color.WHITE);
            } else {
                child.setBackgroundColor(Color.LIGHT_GRAY);
            }
        }
    }
}

public class MyLayoutManager extends RecyclerView.LayoutManager {
    @Override
    public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {
        detachAndScrapAttachedViews(recycler);
        int itemCount = getItemCount();
        for (int i = 0; i < itemCount; i++) {
            View view = recycler.getViewForPosition(i);
            addView(view);
            measureChildWithMargins(view, 0, 0);
            int width = getDecoratedMeasuredWidth(view);
            int height = getDecoratedMeasuredHeight(view);
            layoutDecorated(view, 0, i * height, width, (i + 1) * height);
            // 根据位置或数据内容设置项行的背景色
            if (i % 2 == 0) {
                view.setBackgroundColor(Color.WHITE);
            } else {
                view.setBackgroundColor(Color.LIGHT_GRAY);
            }
        }
    }
}