How to download and import library android v7-appcompat for NetBeans?

I would like to know how to import into a project, using NetBeans, the bookstore android v7-appcompat. I am using a code for studies and Net Beans is not recognizing some lines of code.

public class MainActivity extends Activity implements AppCompatCallback { 
                                        /// Não Reconhece AppCompatCallback
private AppCompatDelegate delegate;
         /// Não Reconhece AppCompatDelegate
 }