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原文链接：

LinearLayoutManager spacing

import android.graphics.Rect;import android.support.v7.widget.RecyclerView;import android.view.View;/** * Created by anonymous on 2016/9/9 0009. * 
 * SpacesItemDecoration * 
 * mRecyclerView.addItemDecoration(new SpacesItemDecoration(5)); */public class SpacesItemDecoration extends RecyclerView.ItemDecoration {
       private int space;    public SpacesItemDecoration(int space) {        this.space = space;    }    @Override    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {        outRect.left = space;        outRect.right = space;        outRect.bottom = space;        // Add top margin only for the first item to avoid double space between items        if (parent.getChildLayoutPosition(view) == 0) {            outRect.top = space;        } else {            outRect.top = 0;        }    }}

使用方法很简单，上面注释中也已经给出：

mRecyclerView.addItemDecoration(new SpacesItemDecoration(5));

GridLayoutManager or StaggeredGridLayoutManager spacing

import android.graphics.Rect;import android.support.v7.widget.RecyclerView;import android.view.View;/** * Created by anonymous on 2016/9/9 0009. * 
 * GridSpacingItemDecoration * 
 * int spanCount = 3; // 3 columns * int spacing = 50; // 50px * boolean includeEdge = false; * recyclerView.addItemDecoration(new GridSpacingItemDecoration(spanCount, spacing, includeEdge)); */public class GridSpacingItemDecoration extends RecyclerView.ItemDecoration {
       private int spanCount;    private int spacing;    private boolean includeEdge;    public GridSpacingItemDecoration(int spanCount, int spacing, boolean includeEdge) {        this.spanCount = spanCount;        this.spacing = spacing;        this.includeEdge = includeEdge;    }    @Override    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {        int position = parent.getChildAdapterPosition(view); // item position        int column = position % spanCount; // item column        if (includeEdge) {            outRect.left = spacing - column * spacing / spanCount; // spacing - column * ((1f / spanCount) * spacing)            outRect.right = (column + 1) * spacing / spanCount; // (column + 1) * ((1f / spanCount) * spacing)            if (position < spanCount) { // top edge                outRect.top = spacing;            }            outRect.bottom = spacing; // item bottom        } else {            outRect.left = column * spacing / spanCount; // column * ((1f / spanCount) * spacing)            outRect.right = spacing - (column + 1) * spacing / spanCount; // spacing - (column + 1) * ((1f /    spanCount) * spacing)            if (position >= spanCount) {                outRect.top = spacing; // item top            }        }    }}

此处不仅对间距进行了处理，而且对spanCount也进行了处理，使用方法：

int spanCount = 3; // 3 columnsint spacing = 50; // 50pxboolean includeEdge = false;mRecyclerView.addItemDecoration(new GridSpacingItemDecoration(spanCount, spacing, includeEdge));