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我是Android Studio和Flutter的新手。我最近想尝试Flutter，因此在Android Studio中安装了该插件。我的Flutter代码没有错误，但是gradle失败了。

应用程序级别构建gradle：

def localProperties = new Properties()  //here, Properties gets highlighted as error
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.")        //here,GradleException gets highlighted as error
}

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

android {
    compileSdkVersion 27

    lintOptions {
        disable 'InvalidPackage'
    }

    defaultConfig {
        // TODO: Specify your own …