Could not find com.android.tools.build:gradle:3.0.0.

解决方法：在project的builde.gradle做如下操作分别加上google()

buildscript {

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

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

allprojects {
repositories {
google()
.....
}
}