用我们自己的小部件来包装选择控件让我们能够将所有与此提要集合相关的表示逻辑（添加和删除提要）都放到同一个地方。

Wrapping the select with our own widget allows us to put all the presentation logic related to the feed selection (adding and removing feeds) in a single place.

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ListView一个小部件，允许用户从一个项目集合中选择一个或多个项目，项目集合可以显示为具有多种样式的多列格式。

ListView a widget that allows users to select one or more items from a collection of items that can be displayed in a multi-column format with different styles.

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