project structure -> dependencies -> add library

,但搜索似乎不起作用,没有找到任何东西.
我的build.gradle文件看起来像这样

buildscript {
repositories {
    jcenter()
    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 {
    jcenter()
    google()
}
}

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

和gradle-wrapper.properties：

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