我找到了一些解释

I found some explanation here. In summary

Content Resolver 将URI解析为特定的 Content provider .

Content Resolver resolves a URI to a specific Content provider.

内容提供程序提供了一个查询内容的接口.

Content Provider provides an interface to query content.

查询内容提供者的方法是contentResolverInstance.query(URI,.....)

The way to query a content provider is contentResolverInstance.query(URI,.....)