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

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这样。

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build.gradle：

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

我已将我的软件包更新到最新版本，并且我正在运行最新版本的Dart和Flutter。

我真的不明白导致这个错误的是什么。

有人可以帮忙吗？

Answer 1

将以下内容添加到Android项目级build.gradle文件的“子项目”部分（在GünterZöchbauer在评论中提供的link中也提到）：

   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]
    }

Answer 2

我在Flutter制作“QR扫描仪应用程序”时遇到了同样的问题，我刚刚在demoapp-> android-> app-> build.gradle-> minSdkVersion中更改了“minSdkVersion 21”，它运行得很好。发生这种情况是因为flutter中的某些依赖性不支持低于21的minSdk。

defaultConfig {
    // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
    applicationId "com.example"
    minSdkVersion 21
    targetSdkVersion 27
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}

Answer 3

打开项目级build.gradle文件并添加以下代码段。

subprojects {
    project.configurations.all {
        resolutionStrategy.eachDependency { details ->
            if (details.requested.group == 'com.android.support'
                && !details.requested.name.contains('multidex') ) {
                details.useVersion "26.1.0"
            }
        }
    }
}

添加此项后，您的项目级build.gradle文件将如下所示：

buildscript {

    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.1'


        // NOTE: Do not place your application dependencies here; they belong
       // in the individual module build.gradle files
    }
}

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

task clean(type: Delete) {
    delete rootProject.buildDir
}
subprojects {
    project.configurations.all {
        resolutionStrategy.eachDependency { details ->
            if (details.requested.group == 'com.android.support'
                && !details.requested.name.contains('multidex') ) {
                details.useVersion "26.1.0"
            }
        }
    }
}

解决方案由GünterZöchbauer提供。 link。这个对我有用。希望能帮助到你。

Answer 4

试试这个在android studio中打开你的项目然后等待它同步，

将build.gradle更新为在构建脚本下的存储库中添加google（），使其看起来像这样

repositories {
        jcenter()
        google()
    }
update classpath
classpath 'com.android.tools.build:gradle:3.1.1'
Update distributionUrl in gradle-wrapper.properties
distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip

implementation "com.android.support:support-v4:27.1.1"  // In case your targetting.