RecyclerView 不包括在基地Android框架，在基地只有小部件Android框架（如的ListView ，的GridView 等）可以在布局不完整的命名空间来指定。 RecyclerView 是recyclerview-v7$c$c>支持库。

RecyclerView is not included in base Android framework, only widgets in base Android framework (like ListView, GridView etc) can be specified in layout without full namespace. RecyclerView is part of recyclerview-v7 support library.