https://source.android.com/ 
public interface android.widget.AutoCompleteTextView$Validator
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: android.widget.AutoCompleteTextView$Validator
  super_class: java.lang.Object
{
  public abstract boolean isValid(java.lang.CharSequence);
    descriptor: (Ljava/lang/CharSequence;)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
      Name  Flags
      text  

  public abstract java.lang.CharSequence fixText(java.lang.CharSequence);
    descriptor: (Ljava/lang/CharSequence;)Ljava/lang/CharSequence;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
             Name  Flags
      invalidText  
}
SourceFile: "AutoCompleteTextView.java"
NestHost: android.widget.AutoCompleteTextView
InnerClasses:
  public abstract Validator = android.widget.AutoCompleteTextView$Validator of android.widget.AutoCompleteTextView