Could not resolve all files for configuration ':classpath'.Could not find com.android.tools.

升级到Android Sutido 3.0后，跑测之前的Model的main()方法方法时报错：

Error:Gradle: A problem occurred configuring root project 'MyApplication'.
> Could not resolve all files for configuration ':classpath'.
   > Could not find com.android.tools.build:gradle:3.0.0.
     Searched in the following locations:
         https://jcenter.bintray.com/com/android/tools/build/gradle/3.0.0/gradle-3.0.0.pom
         https://jcenter.bintray.com/com/android/tools/build/gradle/3.0.0/gradle-3.0.0.jar
     Required by:
         project :

解决：
修改Project的build.gradle（注意：不是App的build.gradle），两处加上google()

buildscript {
    repositories {
        jcenter()
        google()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.0'
    }
}

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

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