Android RecyclerView 设置item间隔的方法 _RecyclerView

壮心未与年俱老，死去犹能作鬼雄。这篇文章主要讲述Android RecyclerView 设置item间隔的方法相关的知识，希望能为你提供帮助。
RecyclerView大家常用，但是如何给加载出来的item增加间隔很多人都不知道，下面是方法，直接上代码了：

LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity()); recyclerView.setLayoutManager(layoutManager); qujangAdapter = new QujiangAdapter(qujiangList, getActivity()); //设置item间距，30dp recyclerView.addItemDecoration(new SpaceItemDecoration(30)); recyclerView.setAdapter(qujangAdapter);

上面的代码是用一个LinearLayoutManager 加载RecyclerView，和一般加载代码不一样的是多了 recyclerView.addItemDecoration(new SpaceItemDecoration(30)); 这一行代码。
下面是SpaceItemDecoration类的实现：

class SpaceItemDecoration extends RecyclerView.ItemDecoration { int mSpace; /** * Retrieve any offsets for the given item. Each field of < code> outRect< /code> specifies * the number of pixels that the item view should be inset by, similar to padding or margin. * The default implementation sets the bounds of outRect to 0 and returns. * < p> * < p> * If this ItemDecoration does not affect the positioning of item views, it should set * all four fields of < code> outRect< /code> (left, top, right, bottom) to zero * before returning. * < p> * < p> * If you need to access Adapter for additional data, you can call * {@link RecyclerView#getChildAdapterPosition(View)} to get the adapter position of the * View. * * @param outRect Rect to receive the output. * @param viewThe child view to decorate * @param parentRecyclerView this ItemDecoration is decorating * @param stateThe current state of RecyclerView. */ @Override public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { super.getItemOffsets(outRect, view, parent, state); outRect.left = mSpace; outRect.right = mSpace; outRect.bottom = mSpace; if (parent.getChildAdapterPosition(view) == 0) { outRect.top = mSpace; } } public SpaceItemDecoration(int space) { this.mSpace = space; } }

　在该类的getItemOffsets方法中设置item各个方向的间距。这里面加入了如果是RecyclerView的第一个子项，则设置该子项上方的间距。
【Android RecyclerView 设置item间隔的方法】 运行出来之后就会发现每个item四周都有间距了。