关于继承RecyclerView.Adapter报错

今天使用

public class BaseAdapter extends RecyclerView.Adapter {

但是报错：

Multiple markers at this line
- The type android.support.v4.view.ScrollingView cannot be resolved. It is indirectly referenced from required .class files
- The type android.support.v4.view.NestedScrollingChild cannot be resolved. It is indirectly referenced from 

明显这是由于现有的android.support.v4缺少类，所以找个新点的，在如下路径可以找到

\android-sdk-windows\extras\android\support\v7\appcompat\libs

ok，问题解决