Could not find method externalNativeBuild() for arguments - android-ndk

Question

i'm trying to integrate the ndkBuild functionality into an existing android studio project, using the new android studio 2.2 , in order to enable c++ debugging etc.
i have tried out one of the ndk example projects which android studio 2.2 offers, which works perfectly fine. However, when i try to run the gradle commands in my own project, i get this error message:
Error:(73, 0) Could not find method externalNativeBuild() for arguments [build_c6heui1f67l8o1c3ifgpntw6$_run_closure2$_closure9#4329c1c9] on project ':core' of type org.gradle.api.Project.
By following this description
http://tools.android.com/tech-docs/external-c-builds
i ended up with a gradle script which includes the following commands:
externalNativeBuild{
ndkBuild{
path "$projectDir/jni/Android.mk"
}
}
externalNativeBuild {
ndkBuild {
arguments "NDK_APPLICATION_MK:=$projectDir/jni/Application.mk"
abiFilters "armeabi-v7a", "armeabi","arm64-v8a","x86"
cppFlags "-frtti -fexceptions"
}
}
Did i perhaps miss out on something here with the project setup?
I have set the Android NDK location properly under
File -> Project Structure ... -> SDK Location -> Android NDK location
in my android studio.
Anything else i might have forgotton?
Has anyone run into a similar problem before?
Advice would be much appreciated =)

Answer 1

Just had this error myself. In your root build.gradle, make sure that gradle is set to at least version 2.2.0:
So you should have the following in buildscript {...}
dependencies {
classpath 'com.android.tools.build:gradle:2.2.0'
}

Answer 2

Suggested by Kun Ming Xies answer, I have separated my cmake part in two to get rid of the annoying error:
Could not find method arguments() for arguments [-DREVISION=1.3.1] on object of type com.android.build.gradle.internal.dsl.CmakeOptions.
The first part in defaultConfig contains the configuration (command line arguments for CMake and C++ flags), and the second contains the path to CMakeLists.txt:
def revision = "1.3.1"
android {
compileSdkVersion 25
buildToolsVersion "25.0.2"
defaultConfig {
versionCode = ...
versionName "${revision}"
externalNativeBuild {
cmake {
arguments "-DREVISION=${revision}"
cppFlags '-fexceptions', '-frtti', '-std=c++11'
}
}
}
buildTypes { }
lintOptions { }
externalNativeBuild {
cmake {
path 'CMakeLists.txt'
}
}
}

Answer 3

android {
defaultConfig {
externalNativeBuild {
cmake {
arguments '-DANDROID_TOOLCHAIN=clang'
}
}
}