找不到com.android.tools.build:gradle:3.0.1

Question

./gradlew

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':app'.
> Could not resolve all files for configuration ':app:classpath'.
   > Could not find com.android.tools.build:gradle:3.0.1.
     Searched in the following locations:
         https://maven.fabric.io/public/com/android/tools/build/gradle/3.0.1/gradle-3.0.1.pom
         https://maven.fabric.io/public/com/android/tools/build/gradle/3.0.1/gradle-3.0.1.jar
         https://jcenter.bintray.com/com/android/tools/build/gradle/3.0.1/gradle-3.0.1.pom
         https://jcenter.bintray.com/com/android/tools/build/gradle/3.0.1/gradle-3.0.1.jar
     Required by:
         project :app

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

* Get more help at https://help.gradle.org

 // 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:3.0.1'

        // 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
}

distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip

...
buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
    }
}
...

Answer 1

只是想多留点小费。当我安装Android Studio时，我在某个地方读到建议离开这个配置（带有'+'符号）

Build.Gradle（项目）

dependencies {
        classpath 'com.android.tools.build:gradle:+'
        .....
        #more lines here
}

然而，我正在使用的项目使用的是gradle的旧版本，这一行总是请求最新版本。我花了一段时间才弄明白。