Plugin [id: ‘flutter‘] was not found in any of the following sources解决方法

错误描述

Plugin [id: ‘flutter’] was not found in any of the following sources:

• Gradle Core Plugins (not a core plugin, please see https://docs.gradle.org/7.5/userguide/standard_plugins.html for available core plugins)
• Plugin Repositories (plugin dependency must include a version number for this source)
  

解决方法

报错提示 Gradle 无法找到 flutter 插件，因为它不是 Gradle 的核心插件，且没有指定插件的来源和版本。Flutter 插件是通过 apply from 方式引入的，而不是通过 Gradle Plugin Portal 或类似的插件仓库。

要修正这个问题，需要调整配置，正确引入 Flutter 的 Gradle 插件。

---

修正方案：继续使用 apply from

由于 Flutter 的 Gradle 插件是 Flutter SDK 自带的，目前还不能直接通过 plugins 块引入。因此，仍需保留以下语句：

apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

完整的 build.gradle 文件应该保持如下结构：

---

修正后的 build.gradle

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {localPropertiesFile.withReader('UTF-8') { reader ->localProperties.load(reader)}
}def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {flutterVersionCode = '1'
}def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {flutterVersionName = '1.0'
}android {compileSdkVersion flutter.compileSdkVersionndkVersion flutter.ndkVersioncompileOptions {sourceCompatibility JavaVersion.VERSION_1_8targetCompatibility JavaVersion.VERSION_1_8}kotlinOptions {jvmTarget = '1.8'}sourceSets {main.java.srcDirs += 'src/main/kotlin'}defaultConfig {applicationId "com.example.learning"minSdkVersion 21targetSdkVersion flutter.targetSdkVersionversionCode flutterVersionCode.toInteger()versionName flutterVersionName}buildTypes {release {signingConfig signingConfigs.debug}}
}flutter {source '../..'
}dependencies {implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"implementation 'com.android.support:multidex:1.0.3'
}

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说明

• apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle" 是 Flutter 官方推荐的加载方式。
• 当前 Flutter SDK 尚未将插件迁移到 Gradle Plugin Portal，因此无法通过 plugins 块直接声明。

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警告的处理

虽然警告仍然存在，但这是 Flutter 官方插件机制的限制。在未来的 Flutter 版本中，官方可能会发布新的机制来消除这种警告。

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进一步验证

1. 清理项目：

   flutter clean
   

2. 重新生成 APK：

   flutter build apk
   

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结束语
Flutter是一个由Google开发的开源UI工具包，它可以让您在不同平台上创建高质量、美观的应用程序，而无需编写大量平台特定的代码。我将学习和深入研究Flutter的方方面面。从基础知识到高级技巧，从UI设计到性能优化，欢饮关注一起讨论学习，共同进入Flutter的精彩世界！