How to arage the recycle view better in the StaggeredGridLayoutManager?

How to arrange the recycle view better in the StaggeredGridLayoutManager?

http://blog.nex3z.com/2016/01/01/recyclerview%E4%BD%BF%E7%94%A8%E6%96%B9%E6%B3%95%E4%B8%BE%E4%BE%8B%EF%BC%882%EF%BC%89/

the concept is:need to know the width of the screen first,that calculate each column width

how to get the width of a fragment?

http://blog.csdn.net/u011494050/article/details/41723777

int mHeaderViewHeight; mHeaderView.getViewTreeObserver().addOnGlobalLayoutListener(        new OnGlobalLayoutListener() {            @Override            public void onGlobalLayout() {                                                                                                                                                                                                                                                      mHeaderViewHeight = mHeaderView.getHeight();                getViewTreeObserver()                        .removeGlobalOnLayoutListener(this);            }        });

calculate the right width of the cell,then set it

imv.getLayoutParams().width= (int) cellWidth;        imv.getLayoutParams().height= (int) (cellWidth*3/2);

to handle the Landscape and Portrait

when Landscape

nee to return the height as width

when Portrait

use the width as width

getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE

SpacesItemDecoration extends RecyclerView.ItemDecoration

set the Decoration between the item