Flutter NetworkImage 错误

Question

Flutter 看起来很有前途，但有时我会被卡住。在这种情况下，错误说明:

package:async/src/typed/stream.dart': error: line 56: class 'TypeSafeStream' overrides method 'firstWhere' of super class or interface 'Stream' with incompatible parameters

我正在使用以下应该有效的代码:

new NetworkImage(googleSignIn.currentUser.photoUrl)

fluttor 医生输出:

[✓] Flutter (on Mac OS X 10.13.4 17E139j, locale nl-NL, channel dev)
    • Flutter version 0.1.2 at /Users/johngorter/Desktop/flutter/flutter
    • Framework revision 8a65872ef9 (6 days ago), 2018-02-13 23:32:28 -0800
    • Engine revision 05c5f817eb
    • Tools Dart version 2.0.0-dev.22.0
    • Engine Dart version 2.0.0-edge.3c4dccbd46f152be9e1b6ca95c57357e8e48057c

[✓] Android toolchain - develop for Android devices (Android SDK 26.0.2)
    • Android SDK at /Users/johngorter/Library/Android/sdk
    • Android NDK at /Users/johngorter/Library/Android/sdk/ndk-bundle
    • Platform android-27, build-tools 26.0.2
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_112-release-b06)

[!] iOS toolchain - develop for iOS devices (Xcode 9.2)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 9.2, Build version 9C40b
    ✗ libimobiledevice and ideviceinstaller are not installed. To install, run:
        brew install --HEAD libimobiledevice
        brew install ideviceinstaller
    ✗ ios-deploy not installed. To install:
        brew install ios-deploy
    ✗ CocoaPods not installed.
        CocoaPods is used to retrieve the iOS platform side's plugin code that responds to your plugin usage on the Dart side.
        Without resolving iOS dependencies with CocoaPods, plugins will not work on iOS.
        For more info, see https://flutter.io/platform-plugins
      To install:
        brew install cocoapods
        pod setup

[✓] Android Studio
    • Android Studio at /Applications/Android Studio 3.0 Preview.app/Contents
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-915-b01)

[✓] Android Studio (version 2.3)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Java version OpenJDK Runtime Environment (build 1.8.0_112-release-b06)

[!] IntelliJ IDEA Community Edition (version 2017.2.3)
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
    • For information about installing plugins, see
      https://flutter.io/intellij-setup/#installing-the-plugins

[✓] VS Code (version 1.20.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Dart Code extension version 2.8.2

[✓] Connected devices
    • Android SDK built for x86 • emulator-5554 • android-x86 • Android 7.1.1 (API 25) (emulator)

! Doctor found issues in 2 categories.

我没有使用 IOS(目前)，我正在使用 VSCode.. 所以问题不会导致错误......

是我做了什么导致了这个还是包中的错误？

Answer 1

切换到master channel 或

添加

dependency_overrides:
  async: ^2.0.4

到pubspec.yaml并运行 `flutter package upgrade should do as workaround until the problem is solved.