Flutter does not work anymore after upgrading

Question

My project was working perfectly and Just today i have upgrade my Flutter then everything start going run.

At the bottom is the error they give me. Please help me.

file:///Users/macbook/Documents/flutter/.pub-cache/hosted/pub.dartlang.org/animated_background-1.0.4/lib/image_helper.dart:17:30: Error: The argument type 'dynamic Function(ImageInfo, bool)' can't be assigned to the parameter type 'ImageStreamListener'.
 - 'ImageInfo' is from 'package:flutter/src/painting/image_stream.dart' ('file:///Users/macbook/Documents/flutter/packages/flutter/lib/src/painting/image_stream.dart').
 - 'ImageStreamListener' is from 'package:flutter/src/painting/image_stream.dart' ('file:///Users/macbook/Documents/flutter/packages/flutter/lib/src/painting/image_stream.dart').
Try changing the type of the parameter, or casting the argument to 'ImageStreamListener'.
    newStream.removeListener(listener);
                             ^
file:///Users/macbook/Documents/flutter/.pub-cache/hosted/pub.dartlang.org/animated_background-1.0.4/lib/image_helper.dart:20:25: Error: The argument type 'dynamic Function(ImageInfo, bool)' can't be assigned to the parameter type 'ImageStreamListener'.
 - 'ImageInfo' is from 'package:flutter/src/painting/image_stream.dart' ('file:///Users/macbook/Documents/flutter/packages/flutter/lib/src/painting/image_stream.dart').
 - 'ImageStreamListener' is from 'package:flutter/src/painting/image_stream.dart' ('file:///Users/macbook/Documents/flutter/packages/flutter/lib/src/painting/image_stream.dart').
Try changing the type of the parameter, or casting the argument to 'ImageStreamListener'.
  newStream.addListener(listener);
                        ^
file:///Users/macbook/Documents/flutter/.pub-cache/hosted/pub.dartlang.org/animated_background-1.0.4/lib/image_helper.dart:21:41: Error: The argument type 'dynamic Function(ImageInfo, bool)' can't be assigned to the parameter type 'ImageStreamListener'.
 - 'ImageInfo' is from 'package:flutter/src/painting/image_stream.dart' ('file:///Users/macbook/Documents/flutter/packages/flutter/lib/src/painting/image_stream.dart').
 - 'ImageStreamListener' is from 'package:flutter/src/painting/image_stream.dart' ('file:///Users/macbook/Documents/flutter/packages/flutter/lib/src/painting/image_stream.dart').
Try changing the type of the parameter, or casting the argument to 'ImageStreamListener'.
  return () => newStream.removeListener(listener);
                                        ^
Compiler failed on /Users/macbook/AndroidStudioProjects/alimmentation/lib/main.dart
Finished with error: Gradle task assembleDebug failed with exit code 1

Answer 1

Solved a similar issue by replacing

/*...*/.addListener((ImageInfo image, bool synchronousCall) { /*...*/ });

with

import 'package:flutter/painting.dart';

/*...*/.addListener(new ImageStreamListener((ImageInfo image, bool synchronousCall) { /*...*/ }) as ImageStreamListener);

Answer 2

I had the same problem, here is some code only as an example

Code that broke:

var sunImage = new NetworkImage(incident.mobileSignature[0].uriFile,
          headers: AuthenticationService.getAuthHeaders());
sunImage.obtainKey(new ImageConfiguration()).then((val) {
    var load = sunImage.load(val);
    load.addListener((listener, err) async {
        ByteData data = await listener.image.toByteData(format:ui.ImageByteFormat.png);
        setState(() => this.signatureImage = data);
    });
  });
}

The code broke on line load.addListener((listener, err) async { ....

I solved creating an ImageListener function that does the same as my previous function with the listener variable. And then create an ImageStreamListener that receives this ImageListener as parameter. Note also that you can send as parameters onError and onChunk to the ImageStreamListener.

var sunImage = new NetworkImage(incident.mobileSignature[0].uriFile,
          headers: AuthenticationService.getAuthHeaders());
sunImage.obtainKey(new ImageConfiguration()).then((val) {
    var load = sunImage.load(val);
    ImageListener imageListener = (ImageInfo imageInfo, syncCall) async {
        ByteData data =
              await imageInfo.image.toByteData(format: ui.ImageByteFormat.png);
          setState(() => this.signatureImage = data);
    };
    ImageStreamListener listenerStream = new ImageStreamListener(imageListener);
    load.addListener(listenerStream, onError: ...., onChunk: ......); // These last parameters are optional
});