Android依赖 'com.android.support:support-v4'有不同的版本

Question

我刚刚升级到 Dart 2 和最新版本的 Flutter，现在我无法构建我的应用程序。我在互联网上环顾四周，但仍然不明白为什么会发生这种情况。

我得到的错误是:

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:preDebugBuild'.
> Android dependency 'com.android.support:support-v4' has different version for the compile (26.1.0) and runtime (27.1.0) classpath. You should manually set the same version via DependencyResolution

项目构建等级:

buildscript {
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
        classpath 'com.google.gms:google-services:3.2.1'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

pubspec.yaml:

dependencies:
  flutter:
    sdk: flutter

  cupertino_icons: ^0.1.2
  google_sign_in: ^3.0.2
  firebase_auth: ^0.5.5
  firebase_database: ^0.4.5
  firebase_core: ^0.2.3

  flutter_blue: ^0.3.3

dev_dependencies:
  flutter_test:
    sdk: flutter


# The following section is specific to Flutter.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

我已将我的包更新到最新版本，并且正在运行最新版本的 Dart 和 Flutter。

我真的不明白是什么导致了这个错误。

有人可以帮忙吗？

Answer 1

将以下内容添加到 Android 项目级别的 build.gradle 文件的“子项目”部分(正如 Günter Zöchbauer 在评论中提供的 link 中所述):

   subprojects {

    project.evaluationDependsOn(':app')
//[PART TO ADD START]
    project.configurations.all {

        resolutionStrategy.eachDependency { details ->

            if (details.requested.group == 'com.android.support'
                    && !details.requested.name.contains('multidex') ) {
                details.useVersion "27.1.0"
            }
        }
    }
//[PART TO ADD END]
    }