1、創(chuàng)建間隔類

public class HomeItemDecoration extends RecyclerView.ItemDecoration {
    int mSpace;
    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        super.getItemOffsets(outRect, view, parent, state);
//        outRect.bottom = mSpace;
        outRect.top = mSpace;
        if (parent.getChildAdapterPosition(view) % 2 == 0) {
            outRect.left = mSpace;
        }else{
            outRect.left = mSpace;
            outRect.right = mSpace;
        }

    }

    public HomeItemDecoration(int space) {
        this.mSpace = space;
    }
}

2、使用

 adapter.addItemDecoration(new HomeItemDecoration((int)getResources().getDimension(R.dimen.dp_15)));