来自android开发者(创建列表和卡片):

RecyclerView小部件是一个更高级和灵活的版本 列表视图。

好吧,这听起来很酷,但当我看到这张示例图片时,我真的很困惑这两者之间的区别。

上面的图片可以通过ListView使用自定义适配器轻松创建。

那么,在什么情况下应该使用RecyclerView呢?


当前回答

ListView和RecyclerView之间有很多区别,但你应该特别注意以下几点:

ViewHolder模式在ListView中是完全可选的,但它被烘焙到RecyclerView中。 ListView只支持垂直滚动,但RecyclerView并不局限于垂直滚动列表。

其他回答

主要优势:

ViewHolder在ListView中默认是不可用的。我们将在getView()中显式地创建。 RecyclerView有内置的Viewholder。

ListView和RecyclerView之间有很多区别,但你应该特别注意以下几点:

ViewHolder模式在ListView中是完全可选的,但它被烘焙到RecyclerView中。 ListView只支持垂直滚动,但RecyclerView并不局限于垂直滚动列表。

I think the main and biggest difference they have is that ListView looks for the position of the item while creating or putting it, on the other hand RecyclerView looks for the type of the item. if there is another item created with the same type RecyclerView does not create it again. It asks first adapter and then asks to recycledpool, if recycled pool says "yeah I've created a type similar to it", then RecyclerView doesn't try to create same type. ListView doesn't have a this kind of pooling mechanism.

您可以使用接口来提供单击侦听器。我用这个 技术与ListViews。 无需分隔:只需在行中添加宽度为的视图 Match_parent和1dp的高度,并给它一个背景色。 简单地使用StateList选择器作为行背景。 addHeaderView也可以在ListViews中避免使用:只需将 视图外的标头。

所以,如果效率是你所关心的,那么是的,用RecyclerView替换ListView是个好主意。

ListView是RecyclerView的祖先。有很多事情ListView没有做,或者做得不好。如果您要收集ListView的缺点,并通过将问题抽象到不同的域来解决问题,那么您最终会得到类似于回收器视图的东西。下面是ListViews的主要问题点:

Didn't enforce View Reuse for same item types (look at one of the adapters that are used in a ListView, if you study the getView method you will see that nothing prevents a programmer from creating a new view for every row even if one is passed in via the convertView variable) Didn't prevent costly findViewById uses(Even if you were recycling views as noted above it was possible for devs to be calling findViewById to update the displayed contents of child views. The main purpose of the ViewHolder pattern in ListViews was to cache the findViewById calls. However this was only available if you knew about it as it wasn't part of the platform at all) Only supported Vertical Scrolling with Row displayed Views (Recycler view doesn't care about where views are placed and how they are moved, it's abstracted into a LayoutManager. A Recycler can therefore support the traditional ListView as shown above, as well as things like the GridView, but it isn't limited to that, it can do more, but you have to do the programming foot work to make it happen). Animations to added/removed was not a use case that was considered. It was completely up to you to figure out how go about this (compare the RecyclerView. Adapter classes notify* method offerings v. ListViews to get an idea).

简而言之,RecyclerView是一个更灵活的ListView,尽管你可能需要做更多的编码工作。