https://source.android.com/ 
public interface android.net.wifi.WifiScanner$ActionListener
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: android.net.wifi.WifiScanner$ActionListener
  super_class: java.lang.Object
{
  public abstract void onSuccess();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract void onFailure(int, java.lang.String);
    descriptor: (ILjava/lang/String;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
             Name  Flags
      reason       
      description  
}
SourceFile: "WifiScanner.java"
NestHost: android.net.wifi.WifiScanner
InnerClasses:
  public abstract ActionListener = android.net.wifi.WifiScanner$ActionListener of android.net.wifi.WifiScanner
    RuntimeVisibleAnnotations: 
      android.annotation.SystemApi()