关于recyclerview 设置item之间的距离
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参考技术A recyclerview本身有一个ItemDecoration的类 是可以用来自由设置间距的但是一定要注意的是 不能重复设置 如果重复设置 列表间距会越来越大的哦
初始化
参考: https://www.jianshu.com/p/e372cec819db
Android RecyclerView 设置item间隔的方法
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 view The child view to decorate * @param parent RecyclerView this ItemDecoration is decorating * @param state The 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。
运行出来之后就会发现每个item四周都有间距了。
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