GridDecoration.java

/**
 * Created by andersonl on 6/18/15.
 */
public class GridDecoration extends RecyclerView.ItemDecoration {
    private int margin;

    public GridDecoration(Context context) {
        margin = context.getResources().getDimensionPixelSize(R.dimen.item_margin);
    }

    @Override
    public void getItemOffsets(
            Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        outRect.set(margin, margin, margin, margin);
    }
}