import android.graphics.Rect;import android.support.v7.widget.RecyclerView;import android.view.View;/** * Created by anonymous on 2016/9/9 0009. * <p> * SpacesItemDecoration * <p> * 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;    }  }}

mRecyclerView.addItemDecoration(new SpacesItemDecoration(5));

import android.graphics.Rect;import android.support.v7.widget.RecyclerView;import android.view.View;/** * Created by anonymous on 2016/9/9 0009. * <p> * GridSpacingItemDecoration * <p> * 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      }    }  }}

    int spanCount = 3; // 3 columns    int spacing = 50; // 50px    boolean includeEdge = false;    mRecyclerView.addItemDecoration(new GridSpacingItemDecoration(spanCount, spacing, includeEdge));