DividerItemDecoration.java

package com.aptoide.amethyst.adapter;

import android.graphics.Rect;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;

/**
 * Created by fabio on 22-10-2015.
 */
public class DividerItemDecoration extends RecyclerView.ItemDecoration {

    private int space;

    public DividerItemDecoration(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.getLayoutManager() instanceof GridLayoutManager){

            int colcount = ((GridLayoutManager) parent.getLayoutManager()).getSpanCount();

            if(parent.getChildPosition(view) < colcount){
                outRect.top = space;
            }

        }else if(parent.getChildPosition(view) == 0){
            outRect.top = space;
        }



    }

}