问题描述：
Error:Could not find com.android.tools.build:gradle:2.3.3.
Searched in the following locations:
file:/Applications/Android Studio.app/Contents/gradle/m2repository/com/android/tools/build/gradle/2.3.3/gradle-2.3.3.pom
file:/Applications/Android Studio.app/Contents/gradle/m2repository/com/android/tools/build/gradle/2.3.3/gradle-2.3.3.jar
https://repo1.maven.org/maven2/com/android/tools/build/gradle/2.3.3/gradle-2.3.3.pom
https://repo1.maven.org/maven2/com/android/tools/build/gradle/2.3.3/gradle-2.3.3.jar
Required by:
project :app
Add Google Maven repository and sync project
处理方法：maven {
url'https://maven.google.com/'
name'Google'
}
若是没有jcenter()
加上很管用
