https://source.android.com/ 
interface android.app.SystemServiceRegistry$ServiceFetcher<T>
  minor version: 0
  major version: 59
  flags: flags: (0x0600) ACC_INTERFACE, ACC_ABSTRACT
  this_class: android.app.SystemServiceRegistry$ServiceFetcher
  super_class: java.lang.Object
{
  public abstract T getService(android.app.ContextImpl);
    descriptor: (Landroid/app/ContextImpl;)Ljava/lang/Object;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (Landroid/app/ContextImpl;)TT;
    MethodParameters:
      Name  Flags
      ctx   
}
Signature: <T:Ljava/lang/Object;>Ljava/lang/Object;
SourceFile: "SystemServiceRegistry.java"
NestHost: android.app.SystemServiceRegistry
InnerClasses:
  abstract ServiceFetcher = android.app.SystemServiceRegistry$ServiceFetcher of android.app.SystemServiceRegistry