* What went wrong:
A problem occurred configuring root project 'android'.
> Could not resolve all files for configuration ':classpath'.
?? > Could not resolve com.android.tools.build:gradle:3.0.0.
???? Required by:
???????? project :
????? > Could not resolve com.android.tools.build:gradle:3.0.0.
???????? > Could not get resource 'https://maven.google.com/com/android/tools/build/gradle/3.0.0/gradle-3.0.0.pom'.
??????????? > Could not GET 'https://maven.google.com/com/android/tools/build/gradle/3.0.0/gradle-3.0.0.pom'.
?????????????? > Remote host closed connection during handshake

解決方法：在project的builde.gradle做如下操作分別加上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()

.....

}

}