https://source.android.com/ 
public interface android.service.textclassifier.TextClassifierService$Callback<T>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: android.service.textclassifier.TextClassifierService$Callback
  super_class: java.lang.Object
{
  public abstract void onSuccess();
    descriptor: (Ljava/lang/Object;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (TT;)V
    MethodParameters:
        Name  Flags
      result  

  public abstract void onFailure(java.lang.CharSequence);
    descriptor: (Ljava/lang/CharSequence;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
       Name  Flags
      error  
}
Signature: <T:Ljava/lang/Object;>Ljava/lang/Object;
SourceFile: "TextClassifierService.java"
NestHost: android.service.textclassifier.TextClassifierService
InnerClasses:
  public abstract Callback = android.service.textclassifier.TextClassifierService$Callback of android.service.textclassifier.TextClassifierService
    RuntimeVisibleAnnotations: 
      android.annotation.SystemApi()