android - 第一次运行Flutter Project

Question

我刚刚在(ProtonVPN)中安装了(Android Studio 4.0.1)，因为我住在叙利亚
当我尝试运行新的Flutter应用程序时
这给我这个错误:
失败:生成失败，发生异常。

其中:
脚本'C:\ src \ flutter \ packages \ flutter_tools \ gradle \ flutter.gradle'行:41

出了什么问题:
评估脚本时发生问题。

Could not find method google() for arguments [] on project ':app' of type org.gradle.api.Project.

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，以获取更多日志输出。与--scan一起运行以获取完整的见解。

在https://help.gradle.org上获得更多帮助

在8m 12s内失败
异常:Gradle任务assembleDebug失败，退出代码为1
我运行flutter doctor -v代码，结果如下:

C:\Users\MSI>flutter doctor -v
[√] Flutter (Channel stable, 1.20.4, on Microsoft Windows [Version 10.0.19041.329], locale en-US)
    • Flutter version 1.20.4 at C:\src\flutter
    • Framework revision fba99f6cf9 (2 weeks ago), 2020-09-14 15:32:52 -0700
    • Engine revision d1bc06f032
    • Dart version 2.9.2


[√] Android toolchain - develop for Android devices (Android SDK version 30.0.0)
    • Android SDK at C:\Users\MSI\AppData\Local\Android\sdk
    • Platform android-30, build-tools 30.0.0
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)
    • All Android licenses accepted.

[√] Android Studio (version 4.0)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin version 49.0.2
    • Dart plugin version 193.7547
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)

[√] VS Code (version 1.49.2)
    • VS Code at C:\Users\MSI\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.14.1

[√] Connected device (1 available)
    • SM G973N (mobile) • 127.0.0.1:62001 • android-x86 • Android 5.1.1 (API 22)

• No issues found!

我的app \ 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 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 "com.example.test_app"
        minSdkVersion 16
        targetSdkVersion 28
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }

    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 '../..'
}

我的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-5.6.2-all.zip

我的android \ build.gradle

buildscript {
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.0'
    }
}

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
}

Answer 1

只需从flutter目录中删除Android和ios文件夹即可。
使用Android Studio删除无效的缓存。
使用flutter create .创建新的android和ios目录
并确保您拥有良好的互联网连接。
编辑答案:
Flutter具有未分级的更改(因为它使用git)，所以我需要隐藏或重置它才能升级它。
转到flutter的路径，然后:

git add -A
git reset --hard

另外，您也可以使用--force对其进行升级。flutter upgrade --force