遇到的情况：

RecyclerView和RecyclerView上面的部件需要保持一点距离，但是给RecyclerView设置padding后发现item滚动时，padding部分不随之一起滚动。

目前想到的有三种

1.禁用RecyclerView滚动，再嵌套一个NestedScrollView（未测试）

2.给RecyclerView设置头部（测试可以，需要在合适的时机添加比较美观）

3.利用addItemDecoration（）方法，添加分割线。（建议该方法）

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.support.v7.widget.RecyclerView;
import android.view.View;/*** Created by leiel on 2018/3/9 0009.*/public class SimpleDividerDecoration extends RecyclerView.ItemDecoration {private int dividerHeight;private Paint dividerPaint;public SimpleDividerDecoration(Context context) {dividerPaint = new Paint();dividerPaint.setColor(context.getResources().getColor(R.color.bg_gray));dividerHeight = context.getResources().getDimensionPixelSize(R.dimen.m1);}private int isF = 1;@Overridepublic void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {int childCount = parent.getChildCount();int left = parent.getPaddingLeft();int right = parent.getWidth() - parent.getPaddingRight();for (int i = 0; i < childCount - 1; i++) {View view = parent.getChildAt(i);float top = view.getTop();float bottom = view.getTop() + dividerHeight;if (i == 0) {if (isF == 1) {view.setPadding(view.getPaddingLeft(), view.getPaddingTop() + 10,view.getPaddingRight(), view.getPaddingBottom());isF = 0;}c.drawRect(left, top, right, bottom + 10, dividerPaint);} elsec.drawRect(left, top, right, bottom, dividerPaint);}}}复制代码

参考链接：https://www.jianshu.com/p/b46a4ff7c10a(翻译)