android studio——Could not find method externalNativeBuild()

gradle同步工程時出現錯誤

Error:(36, 0) Could not find method externalNativeBuild() for arguments [build_cazi725f729u97iya9u1d1xfh$_run_closure2$_closure7$_closure15@20cbf76f] on ProductFlavor_Decorated{name=main, dimension=null, minSdkVersion=DefaultApiVersion{mApiLevel=16, mCode

解決方法：確保在build.gradle中，gradle最低被設置為2.2.0

即在buildscript {...}中

dependencies {
    classpath 'com.android.tools.build:gradle:2.2.0'
}