运行报错

[BinaryCraftsman]

The following NoSuchMethodError was thrown building ImageDetailPage(dirty, dependencies: I/flutter ( 3238): [MediaQuery], state: _ImageDetailPageState#20106): I/flutter ( 3238): Class 'Future' has no instance getter 'width'. I/flutter ( 3238): Receiver: Instance of 'Future'

报错原因是因为编译器搞不清楚image类是painting.dart里的 还是image.dart里的

[BinaryCraftsman]

将image_cut.dart的第183行image的类型由var 改为flutterui.Image即可，但同时方法开头要加上async，“=”后面要加上await代码如下 onPressed: ()async{ //convert the clip square to the clip image double rate =this.image.width.toDouble()/width; var source = Rect.fromLTWH(_points[2].dx rate,(_points[2].dy-(height-_points[3].dy)/2) rate,cWidth rate,cHeight rate); var dest = Rect.fromLTWH(0,0,cWidth rate,cHeight rate); PictureRecorder recorder = PictureRecorder(); Canvas canvas2 = Canvas(recorder); Paint paint2 = new Paint(); canvas2.drawImageRect(image, source, dest, paint2); flutterui.Image image2 = await recorder.endRecording().toImage(dest.width.toInt(), dest.height.toInt()); Navigator.push(context,new MaterialPageRoute(builder: (context) => ImageDetailPage(title: "image",image: image2)));

            }),

同时把ImageDetailPage类及后续会调用image的类的image属性都改为相同即可

[AXXZSTHL]

Compiler message: lib/image_cut.dart:29:37: Error: Too few positional arguments: 2 required, 0 given. stream.removeListener(listener()); ^ lib/image_cut.dart:29:37: Error: This expression has type 'void' and can't be used. stream.removeListener(listener()); ^ lib/image_cut.dart:32:24: Error: The argument type 'void Function(ImageInfo, bool)' can't be assigned to the parameter type 'ImageStreamListener'.

• 'ImageInfo' is from 'package:flutter/src/painting/image_stream.dart' ('file:///D:/Soft/Flutter/flutter/packages/flutter/lib/src/painting/image_stream.dart').
• 'ImageStreamListener' is from 'package:flutter/src/painting/image_stream.dart' ('file:///D:/Soft/Flutter/flutter/packages/flutter/lib/src/painting/image_stream.dart'). Try changing the type of the parameter, or casting the argument to 'ImageStreamListener'. stream.addListener(listener); ^ lib/fade_in_cache.dart:349:38: Error: The argument type 'void Function(ImageInfo, bool)' can't be assigned to the parameter type 'ImageStreamListener'.
• 'ImageInfo' is from 'package:flutter/src/painting/image_stream.dart' ('file:///D:/Soft/Flutter/flutter/packages/flutter/lib/src/painting/image_stream.dart').
• 'ImageStreamListener' is from 'package:flutter/src/painting/image_stream.dart' ('file:///D:/Soft/Flutter/flutter/packages/flutter/lib/src/painting/image_stream.dart').
  Try changing the type of the parameter, or casting the argument to 'ImageStreamListener'. oldImageStream?.removeListener(_handleImageChanged); ^ lib/fade_in_cache.dart:350:32: Error: The argument type 'void Function(ImageInfo, bool)' can't be assigned to the parameter type 'ImageStreamListener'.
• 'ImageInfo' is from 'package:flutter/src/painting/image_stream.dart' ('file:///D:/Soft/Flutter/flutter/packages/flutter/lib/src/painting/image_stream.dart').
• 'ImageStreamListener' is from 'package:flutter/src/painting/image_stream.dart' ('file:///D:/Soft/Flutter/flutter/packages/flutter/lib/src/painting/image_stream.dart').
  Try changing the type of the parameter, or casting the argument to 'ImageStreamListener'. _imageStream.addListener(_handleImageChanged); ^ lib/fade_in_cache.dart:360:34: Error: The argument type 'void Function(ImageInfo, bool)' can't be assigned to the parameter type 'ImageStreamListener'.
• 'ImageInfo' is from 'package:flutter/src/painting/image_stream.dart' ('file:///D:/Soft/Flutter/flutter/packages/flutter/lib/src/painting/image_stream.dart').
• 'ImageStreamListener' is from 'package:flutter/src/painting/image_stream.dart' ('file:///D:/Soft/Flutter/flutter/packages/flutter/lib/src/painting/image_stream.dart'). Try changing the type of the parameter, or casting the argument to 'ImageStreamListener'. _imageStream?.removeListener(_handleImageChanged); ^ lib/fade_in_cache.dart:561:31: Error: The argument type 'Null Function(StringBuffer)' can't be assigned to the parameter type 'Iterable Function()'.
• 'StringBuffer' is from 'dart:core'.
• 'Iterable' is from 'dart:core'.
• 'DiagnosticsNode' is from 'package:flutter/src/foundation/diagnostics.dart' ('file:///D:/Soft/Flutter/flutter/packages/flutter/lib/src/foundation/diagnostics.dart'). Try changing the type of the parameter, or casting the argument to 'Iterable Function()'. informationCollector: (StringBuffer information) { ^ Compiler failed on D:\Download\flutter-image-cut-master\lib/main.dart

FAILURE: Build failed with an exception.

• Where: Script 'D:\Soft\Flutter\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 652

• What went wrong: Execution failed for task ':app:compileflutterBuildDebugandroid-arm'.

  Process 'command 'D:\Soft\Flutter\flutter\bin\flutter.bat'' finished with non-zero exit value 1

• Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

BUILD FAILED in 15s

[AXXZSTHL]

更新flutter版本1.7.8+hotfix.3后出现以下错误

Error: The argument type 'Null Function(ImageInfo, bool)' can't be assigned to the parameter type 'ImageStreamListener'.

解决方法：

将出现错误的地方

_imageStream.addListener(_handleImageLoaded);

改成

_imageStream.addListener(ImageStreamListener(_handleImageLoaded));

[dikeboy]

已修复