diff --git a/lib/receive_intent.dart b/lib/receive_intent.dart
index 5887f75..de44d0c 100644
--- a/lib/receive_intent.dart
+++ b/lib/receive_intent.dart
@@ -3,6 +3,9 @@ import 'dart:convert';
 
 import 'package:flutter/services.dart';
 
+const kActivityResultOk = -1;
+const kActivityResultCanceled = 0;
+
 class Intent {
   final bool isNull;
   final String? fromPackageName;