Question

自两天以来，我一直在尝试解决此问题，并且我还尝试了Stack Overflow上有关此问题的解决方案，但未成功。我遵循的所有步骤均来自 将Firebase添加到您的Android应用指南中（Firebase官方提供的步骤）

PROJECT-LEVEL Build.gradle：

buildscript {
    ext.kotlin_version = '1.2.71'
    repositories {
        google()
        jcenter()
    }

    dependencies {

        classpath 'com.android.tools.build:gradle:3.2.1'
        classpath 'com.google.gms:google-services:4.3.2'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

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
}

APP-LEVEL Build.gradle：

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.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

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

android {
    compileSdkVersion 28

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    lintOptions {
        disable 'InvalidPackage'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.example.loginapp"
        minSdkVersion 16
        targetSdkVersion 28
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
        testInstrumentationRunner "android.support.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 {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'com.google.firebase:firebase-analytics:17.2.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}
apply plugin: 'com.google.gms.google-services'

Pubspec.yaml文件：

version: 1.0.0+1

environment:
  sdk: ">=2.1.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^0.1.2
  firebase_auth: ^0.14.0+9

dev_dependencies:
  flutter_test:
    sdk: flutter

Gradle-wrapper.properties：

#Fri Jun 23 08:50:38 CEST 2017
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.2-all.zip

错误：

PS D:\flutterworks\bhund> flutter run
Using hardware rendering with device Android SDK built for x86. If you get graphics artifacts, consider enabling software rendering with
"--enable-software-rendering".
Launching lib\main.dart on Android SDK built for x86 in debug mode...
Initializing gradle...                                              5.1s
Resolving dependencies...
* Error running Gradle:
ProcessException: Process "D:\flutterworks\bhund\android\gradlew.bat" exited abnormally:

  Command: D:\flutterworks\bhund\android\gradlew.bat app:properties


Please review your Gradle project setup in the android/ folder.
PS D:\flutterworks\bhund>

Answer 1

我遇到了同样的问题，无法手动迁移到Androidx。请注意，如果您想使用Firebase，则必须使项目现在位于Androidx中，否则以后可能会引起更多问题。

步骤1：在您的项目级别更改gradle：

    classpath 'com.google.gms:google-services:4.3.2'

收件人：

    classpath 'com.google.gms:google-services:3.2.0'

通常，在此步骤之后，您的项目将运行正常，但是可以立即导入到AndroidX，并且不会在使用Firebase时引起进一步的错误。

第2步：完成此操作后，只需使用Androidx设置创建一个新项目，就可以打开flutter_console.bat并导航到所需的文件夹，然后运行：

    flutter create --androidx your_project_name

在抖动控制台上。

第3步：导航至新项目> android> gradle.properties，并检查其是否包含这两行：

    android.useAndroidX=true
    android.enableJetifier=true

这意味着该项目已迁移到Androidx。

第4步：最后，将您所有的代码从旧项目移至新的flutter项目，以及您可能已在旧项目中添加的所有依赖项和插件。（包括步骤1中的依赖项）

Answer 2

您可以尝试的是进入项目级别的构建，并按如下所示更改 classpath依赖项和 kotlin版本。

buildscript {
    ext.kotlin_version = '1.3.21'
    repositories {
        google()
        jcenter()
    }

    dependencies {

        classpath 'com.android.tools.build:gradle:3.3.0'
        classpath 'com.google.gms:google-services:4.3.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

要在flutter项目中添加AndroidX，请转到 android程序包> gradle.properties

在gradle.properties内部添加两行。

android.useAndroidX=true
android.enableJetifier=true

这可能对您有用。

无法将Firebase添加到android（颤振）

2 个答案: