The most direct way of navigating to declarations or type declarations is pressing Ctrl (Cmd on OS X) and clicking on the method name when it is displayed as a link. This option is also accessible from the Navigate | Declaration menu or pressing Ctrl + B (Cmd + B on OS X).
We can navigate through the hierarchy of methods from the left edge of the editor. Next to the method declarations that belong to a hierarchy of methods, there is an icon that indicates whether a method is implementing an interface method, implementing an abstract class method, overriding a superclass method, or getting implemented or overridden by other descendants. Click on these icons to navigate to the methods in the hierarchy. This option is also available via Navigate | Super Method or Navigate | Implementation(s). You can test it in the main activity of our first project (MainActivity.java), as shown in the following screenshot:
On the left edge of the editor, you can find another type of navigation...