将firebase添加到flutter项目并获得FAILURE：构建失败并出现异常错误

Question

对于 [this flutter library][1] as barcode scanner 我应该将 firebase 添加到项目中，但是在这样做之后我得到了这个错误，我还不能修复它

在调试模式下在 WAS LX1A 上启动 lib\main.dart... 正在初始化 gradle... 解决依赖关系... * 运行 Gradle 时出错：ProcessException: Process "E:\Projects\Flutter\barcode_scanner\android\gradlew.bat" exited 异常：

FAILURE：构建失败并出现异常。

• 其中：构建文件 'E:\Projects\Flutter\barcode_scanner\android\app\build.gradle' 行： 14

• 出了什么问题：评估项目 ':app' 时出现问题。

  ASCII

• 尝试：使用 --stacktrace 选项运行以获取堆栈跟踪。使用 --info 或 --debug 选项运行以获得更多日志输出。运行 --scan 以获得完整的见解。

• 通过https://help.gradle.org获得更多帮助

在 6 秒内构建失败命令： E:\Projects\Flutter\barcode_scanner\android\gradlew.bat app:properties

以错误结束：请检查您的 Gradle 项目设置 android/文件夹。

第 14 行是：

apply plugin: 'com.android.application'

我不确定是什么问题，这是我的实现

pabspec.yaml内容：

version: 1.0.0+1
environment:
  sdk: '>=2.0.0-dev.28.0 <3.0.0'

dependencies:
  flutter:
    sdk: flutter
  firebase_core: ^0.4.0
  ...
...

android/build.gradle内容：

buildscript {
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.1'
        classpath 'com.google.gms:google-services:4.3.0'
    }
}

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
}

android/app/build.gradle内容：

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

apply plugin: 'com.android.application'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {
    compileSdkVersion 28

    lintOptions {
        disable 'InvalidPackage'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "barcodescanner.pishguy.barcode_scanner"
        minSdkVersion 21
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.debug
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    testImplementation 'junit:junit:4.12'
    implementation 'com.google.firebase:firebase-core:17.0.1'
    androidTestImplementation 'androidx.test:runner:1.3.0-alpha01'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0-alpha01'
}
apply plugin: 'com.google.gms.google-services'

运行flutter 命令：

E:\Projects\Flutter\barcode_scanner>flutter pub get
Running "flutter pub get" in barcode_scanner...                     2.7s


  [1]: https://github.com/facundomedica/fast_qr_reader_view

Answer 1

'com.google.gms:google-services:4.3.0' 存在问题。
将其切换到 'com.google.gms:google-services:4.2.0'，它对我有用。

Answer 2

这是我同样的问题；我设法最终解决了这个问题。

这是我对代码所做的更改：

在 AppName/Android/gradle/build.gradle：

buildscript {
    ext.kotlin_version = '1.3.50' //had to changed it previously 1.2.71
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.1' //had to changed previously 3.2.1
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.3.2'
    }
}

然后在 AppName/Android/gradle/wrapper/gradle-wrapper.properties 我刚刚更改了这一行：

distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip //it was peviously gradle-4.10.2-all.zip

在所有这些更改之后，我的应用程序正常工作。

Answer 3

最新版本的 firebase 库中有一些 breaking changes。我遇到了同样的问题，但在migrating to AndriodX 之后一切正常。

Answer 4

如果这个 'com.google.gms:google-services:4.3.0'。 将其切换为 'com.google.gms:google-services:4.2.0' 不起作用或像我一样带来其他错误......添加此

subprojects {
        project.configurations.all {
            resolutionStrategy.eachDependency { details ->
                if (details.requested.group == 'com.android.support'
                        && !details.requested.name.contains('multidex') ) {
                    details.useVersion "27.1.1"
                }
                if (details.requested.group == 'androidx.core'
                        && !details.requested.name.contains('androidx') ) {
                    details.useVersion "1.0.1"
                }
            }
        }
    }

到 android/build.gradle

所以你的代码将是

 buildscript {
    ext.kotlin_version = '1.2.51'
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:4.2.0'
    }

    subprojects {
        project.configurations.all {
            resolutionStrategy.eachDependency { details ->
                if (details.requested.group == 'com.android.support'
                        && !details.requested.name.contains('multidex') ) {
                    details.useVersion "27.1.1"
                }

                if (details.requested.group == 'androidx.core'
                        && !details.requested.name.contains('androidx') ) {
                    details.useVersion "1.0.1"
                }
            }
        }
    }

}

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
}