I'm stuck in Chapter 9

In the book you need to Install dependency recyclerview-v7, but the support Library gives me the versione for the latest API 26, but my SDK version is only API 25 so is the tools version. I tryed updating but all I get is that I have the latest version.The result is an error message in the build.gradle (app) because the API do not mach. The same with the other dependency all have been updated to API 26. I do not know what to do.

API 26 is a developer preview and probably shouldn’t be used yet unless you know what you’re doing. I suggest manually changing the support library version in build.gradle to 25.3.1.

O.K. It looks like it is working. thanks.