Update listener handling flutter/flutter#32936

+# Changelog
+
 ## 2.1.0
 
-* Add html to pdf platform conversion
+- Add html to pdf platform conversion
+- Fix issue with flutter 1.6.2+
 
 ## 2.0.4
 
-* Update Readme
+- Update Readme
 
 ## 2.0.3
 
-* Add file save and view to example application
-* Convert print screen example to Widgets
-* Deprecate the document argument in Printing.sharePdf()
+- Add file save and view to example application
+- Convert print screen example to Widgets
+- Deprecate the document argument in Printing.sharePdf()
 
 ## 2.0.2
 
-* Fix example application
+- Fix example application
 
 ## 2.0.1
 
-* Fix Replace FlutterErrorDetails to be compatible with Dart 2.3.0
+- Fix Replace FlutterErrorDetails to be compatible with Dart 2.3.0
 
 ## 2.0.0
 
-* Breaking change: Switch libraries to AndroidX
-* Add Page information to PdfDoc object
+- Breaking change: Switch libraries to AndroidX
+- Add Page information to PdfDoc object
 
 ## 1.3.5
 
-* Restore compatibility with Flutter 1.0.0
-* Update code to Dart 2.1.0
-* Depends on pdf 1.3.3
+- Restore compatibility with Flutter 1.0.0
+- Update code to Dart 2.1.0
+- Depends on pdf 1.3.3
 
 ## 1.3.4
 
-* Fix iOS build with Swift
-* Add installation instructions in the Readme
-* Follow Flutter debug painting settings
+- Fix iOS build with Swift
+- Add installation instructions in the Readme
+- Follow Flutter debug painting settings
 
 ## 1.3.3
 
-* Fix dart lint warnings
-* Add documentation
-* Add a filename parameter for sharing
-* Convert Objective-C code to Swift
-* Update Readme
+- Fix dart lint warnings
+- Add documentation
+- Add a filename parameter for sharing
+- Convert Objective-C code to Swift
+- Update Readme
 
 ## 1.3.2
 
-* Fix iOS printing issues
+- Fix iOS printing issues
 
 ## 1.3.1
 
-* Fix pana linting notices
+- Fix pana linting notices
 
 ## 1.3.0
 
-* Add a Flutter like widget system
+- Add a Flutter like widget system
 
 ## 1.2.0
 
-* Fix compileSdkVersion to match appcompat
-* Change license to Apache 2.0
-* Implement asynchronous printing driven by the OS
+- Fix compileSdkVersion to match appcompat
+- Change license to Apache 2.0
+- Implement asynchronous printing driven by the OS
 
 ## 1.1.0
 
-* Rename classes to satisfy Dart conventions
-* Remove useless new and const keywords
-* Changed appcompat dependency to 26.1.0
+- Rename classes to satisfy Dart conventions
+- Remove useless new and const keywords
+- Changed appcompat dependency to 26.1.0
 
 ## 1.0.6
 
-* Add screenshot example
+- Add screenshot example
 
 ## 1.0.5
 
-* Fix printing from pdf document
+- Fix printing from pdf document
 
 ## 1.0.4
 
-* Update example for pdf 1.0.5
-* Add Contributing
+- Update example for pdf 1.0.5
+- Add Contributing
 
 ## 1.0.3
 
-* Update source formatting
-* Update README
+- Update source formatting
+- Update README
 
 ## 1.0.2
 
-* Add License file
-* Updated homepage
+- Add License file
+- Updated homepage
 
 ## 1.0.1
 
-* Fixed sdk version
+- Fixed sdk version
 
 ## 1.0.0
 
-* Initial release.
+- Initial release.

@@ -40,16 +40,15 @@ Future<PdfImage> pdfImageFromImageProvider(
   final ImageStream stream =
       image.resolve(configuration ?? ImageConfiguration.empty);
 
-  Future<void> listener(ImageInfo image, bool sync) async {
+  ImageStreamListener listener;
+  listener = ImageStreamListener((ImageInfo image, bool sync) async {
     final PdfImage result =
         await pdfImageFromImage(pdf: pdf, image: image.image);
     if (!completer.isCompleted) {
       completer.complete(result);
     }
     stream.removeListener(listener);
-  }
-
-  void errorListener(dynamic exception, StackTrace stackTrace) {
+  }, onError: (dynamic exception, StackTrace stackTrace) {
     if (!completer.isCompleted) {
       completer.complete(null);
     }
@@ -59,9 +58,9 @@ Future<PdfImage> pdfImageFromImageProvider(
       // https://groups.google.com/forum/#!topic/flutter-announce/hp1RNIgej38
       assert(false, 'image failed to load');
     }
-  }
+  });
 
-  stream.addListener(listener, onError: errorListener);
+  stream.addListener(listener);
   return completer.future;
 }