Android 梯度同步失败：无法解析'；的依赖项：app@debug/compileClasspath'；

我们在Android Studio中创建了一个新项目，但我们的应用程序没有运行。（我们有最新版本的Android Studio和SDK）

您可以检查以下错误消息：

Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.support:appcompat-v7:28.0.0-rc02.
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Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.support.constraint:constraint-layout:1.1.3.
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Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.android.support:appcompat-v7:28.0.0-rc02.
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Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.android.support.constraint:constraint-layout:1.1.3.
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Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve com.android.support:appcompat-v7:28.0.0-rc02.
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Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve com.android.support.constraint:constraint-layout:1.1.3.
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Failed to resolve: com.android.support:appcompat-v7:28.0.0-rc02
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Failed to resolve: com.android.support.constraint:constraint-layout:1.1.3
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您可以在下面检查Build.gradle（位于项目根目录中）：

问题在哪里？

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我们如何解决这个问题？

主要是因为您的IP。是否在

文件->设置->构建和..

中启用了梯度脱机模式？如果是，请尝试禁用它。不幸的是，伊朗IP被AS阻止下载依赖项，这可能会导致此问题。脱机模式未启用。另外，我正在使用VPN。您是否也可以粘贴项目根目录的

Build.gradle

？哪个包含存储库？那太好了。看看能不能帮上忙ઽ૯ท 问题已更新。

    // Top-level build file where you can add configuration options common to all sub-projects/modules.

    buildscript {

        repositories {
            google()
            jcenter()
        }
        dependencies {
            classpath 'com.android.tools.build:gradle:3.1.4'


            // NOTE: Do not place your application dependencies here; they belong
            // in the individual module build.gradle files
        }
    }

    allprojects {
        repositories {
            google()
            jcenter()
        }
    }

task clean(type: Delete) {
    delete rootProject.buildDir
}