https://source.android.com/ 
public interface android.app.ActionBar$OnNavigationListener
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: android.app.ActionBar$OnNavigationListener
  super_class: java.lang.Object
{
  public abstract boolean onNavigationItemSelected(int, long);
    descriptor: (IJ)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
              Name  Flags
      itemPosition  
      itemId        
}
SourceFile: "ActionBar.java"
NestHost: android.app.ActionBar
InnerClasses:
  public abstract OnNavigationListener = android.app.ActionBar$OnNavigationListener of android.app.ActionBar
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()